import asyncio
import io
import logging
import os
import hashlib
import base64
import random
import time
from contextlib import asynccontextmanager
from datetime import datetime, timedelta, timezone
from pathlib import Path

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
    datefmt="%H:%M:%S",
)
logger = logging.getLogger("homelabtoolkit")

import httpx
from fastapi import FastAPI, HTTPException, Query, Request
from fastapi.responses import FileResponse, HTMLResponse, Response, StreamingResponse
from fastapi.staticfiles import StaticFiles
from PIL import Image, ImageChops, ImageDraw, ImageFont, ImageFilter, ImageColor, ImageOps, UnidentifiedImageError

from services import db as db_service
from services import favorites as favorites_service
from services import music_covers as music_service
from services import music_library as library_service
from services import navidrome as navidrome_service
from services import settings as settings_service
from services.favorites import FavoritesError
from services.music_covers import ProcessOptions
from services.navidrome import NavidromeError
from services.recommendations import DEFAULT_TARGET_SIZE

Image.MAX_IMAGE_PIXELS = None  # Emby backdrops can exceed PIL's default bomb threshold; source is trusted

EMBY_URL = os.environ.get("EMBY_URL", "http://10.0.0.2:8096")
EMBY_API_KEY = os.environ.get("EMBY_API_KEY", "b9af54b630f6448289ab96422add567a")
CACHE_DIR = Path("cache")
CACHE_DIR.mkdir(exist_ok=True)
IMPORT_CACHE_DIR = CACHE_DIR / "imports"
IMPORT_CACHE_DIR.mkdir(exist_ok=True)
EMBY_IMAGE_CACHE_DIR = CACHE_DIR / "emby_images"
EMBY_IMAGE_CACHE_DIR.mkdir(exist_ok=True)
CLEAN_POSTER_CACHE_DIR = CACHE_DIR / "clean_posters"
CLEAN_POSTER_CACHE_DIR.mkdir(exist_ok=True)
RENDER_VERSION = "series-banner-v24-poster-logo"
COLLECTION_RENDER_VERSION = "collection-cover-v1"

THUMB_WIDTH = 800
THUMB_HEIGHT = 450
PRIMARY_WIDTH = 1000
PRIMARY_HEIGHT = 1500
PRIMARY_MIN_ZOOM = 1.0
PRIMARY_MAX_ZOOM = 2.6
UPLOAD_MAX_BYTES = 40 * 1024 * 1024
HTTP_TIMEOUT = 30.0
EMBY_SOURCE_CACHE_TTL = 300
EMBY_SOURCE_MISS_TTL = 90
http_client: httpx.AsyncClient | None = None
AIRING_LOOKUP_CACHE_TTL = 900
NEW_SEASON_MIN_AGE_DAYS = 7
NEW_SEASON_MAX_AGE_DAYS = 21
SEASON_INFERENCE_LOOKBACK_DAYS = 180
airing_lookup_cache: dict[int, dict] = {}
airing_lookup_lock = asyncio.Lock()

# ── Studio logo file map ─────────────────────────────────────────────────────
STUDIOS_DIR = Path("static/studios")

# Maps typed search aliases → internal studio key
STUDIO_SEARCH_ALIASES: dict[str, str] = {
    "netflix":    "netflix",
    "apple tv":   "appletv",
    "apple tv+":  "appletv",
    "appletv":    "appletv",
    "appletv+":   "appletv",
    "apple":      "appletv",
    "paramount":  "paramountplus",
    "paramount+": "paramountplus",
    "cbs":        "paramountplus",
    "hbo":        "hbo",
    "hbo max":    "hbo",
    "max":        "hbo",
    "disney":     "disney",
    "disney+":    "disney",
    "hulu":       "hulu",
}

# Emby studio display names to search for each key (tried in order)
STUDIO_EMBY_NAMES: dict[str, list[str]] = {
    "netflix":       ["Netflix"],
    "appletv":       ["Apple TV+", "Apple Studios", "Apple"],
    "paramountplus": ["Paramount+", "CBS Studios", "CBS", "Paramount Network"],
    "hbo":           ["HBO", "HBO Max", "Max"],
    "disney":        ["Disney+", "Disney"],
    "hulu":          ["Hulu"],
}
STUDIO_FILES: dict[str, Path] = {
    "hulu":          STUDIOS_DIR / "hulu.png",
    "hbo":           STUDIOS_DIR / "hbo.png",
    "disney":        STUDIOS_DIR / "disney.png",
    "appletv":       STUDIOS_DIR / "apple-tv.png",
    "paramountplus": STUDIOS_DIR / "paramount-plus.png",
    "netflix":       STUDIOS_DIR / "netflix.png",
}


def round_image_corners(img: Image.Image, radius: int) -> Image.Image:
    img = img.convert("RGBA")
    mask = Image.new("L", img.size, 0)
    ImageDraw.Draw(mask).rounded_rectangle([(0, 0), (img.width - 1, img.height - 1)], radius=radius, fill=255)
    img.putalpha(ImageChops.multiply(img.getchannel("A"), mask))
    return img


def make_studio_logo(studio: str, max_height: int = 52) -> Image.Image | None:
    path = STUDIO_FILES.get(studio)
    if not path or not path.exists():
        return None
    img = Image.open(path).convert("RGBA")
    if img.height > max_height:
        scale = max_height / img.height
        img = img.resize((int(img.width * scale), max_height), Image.LANCZOS)
    return img


def infer_auto_studio_key(item: dict) -> str | None:
    item_type = (item.get("Type") or "").strip().lower()
    if item_type not in ("series", "movie"):
        return None
    image_tags = item.get("ImageTags") or {}
    if "Logo" not in image_tags:
        return None

    studios = item.get("Studios") or []
    names: list[str] = []
    if isinstance(studios, list):
        for studio in studios:
            if isinstance(studio, dict):
                name = studio.get("Name") or ""
            else:
                name = str(studio or "")
            if name:
                names.append(name)
    elif isinstance(studios, str) and studios.strip():
        names.append(studios)

    normalized = " ".join(names).lower()
    logger.info("  Studio detection : type=%s  studios=%s", item_type, names)

    if "apple" in normalized:
        return "appletv"
    if "netflix" in normalized:
        return "netflix"
    if "paramount" in normalized:
        return "paramountplus"
    return None


async def get_item_summary(item_id: str) -> dict | None:
    data = await emby_get("/Items", {
        "Ids": item_id,
        "Recursive": "true",
        "Fields": "ProductionYear,Studios",
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo,Backdrop",
    })
    items = data.get("Items") or []
    return items[0] if items else None


async def apply_auto_studio_defaults(options: dict) -> dict:
    effective = dict(options)
    requested_studio = (effective.get("studio") or "none").strip().lower()
    if requested_studio == "appletv":
        effective["studio_position"] = "top-left"
        return effective
    if requested_studio not in ("auto", ""):
        return effective

    item = await get_item_summary(effective["item_id"])
    if not item:
        effective["studio"] = "none"
        return effective
    auto_studio = infer_auto_studio_key(item)
    if auto_studio == "appletv":
        effective["studio"] = "appletv"
        effective["studio_position"] = "top-left"
    elif auto_studio == "netflix":
        effective["studio"] = "netflix"
        effective["studio_position"] = "top-left"
    elif auto_studio == "paramountplus":
        effective["studio"] = "paramountplus"
        effective["studio_position"] = "top-left"
    else:
        effective["studio"] = "none"
    logger.info("  Auto studio      : %s → %s", item.get("Name"), effective["studio"])
    return effective


def load_image_from_bytes(image_bytes: bytes, mode: str = "RGB") -> Image.Image:
    """Fully decode image bytes into an in-memory PIL image.

    Some Emby-delivered assets appear to trigger blocky/partial artifacts when
    we process the lazy decoder output directly. Forcing a full load and copy
    gives us a stable image object before resize/filter operations.
    """
    with Image.open(io.BytesIO(image_bytes)) as img:
        img = ImageOps.exif_transpose(img)
        img.load()
        return img.convert(mode).copy()


def encode_jpeg_bytes(img: Image.Image, *, quality: int = 95) -> bytes:
    buf = io.BytesIO()
    img.convert("RGB").save(buf, format="JPEG", quality=quality, optimize=True, progressive=True)
    return buf.getvalue()


def validate_image_bytes(image_bytes: bytes, *, max_pixels: int = 24_000_000) -> tuple[int, int, str]:
    try:
        with Image.open(io.BytesIO(image_bytes)) as img:
            img.verify()
            width, height = img.size
            fmt = img.format or "image"
    except (UnidentifiedImageError, OSError, ValueError) as exc:
        raise HTTPException(status_code=400, detail="The downloaded file is not a valid image.") from exc
    if width * height > max_pixels:
        raise HTTPException(status_code=400, detail="Image is too large to process safely.")
    return width, height, fmt


def get_upload_cache_path(upload_id: str) -> Path:
    if not upload_id or any(ch not in "0123456789abcdef" for ch in upload_id.lower()):
        raise HTTPException(status_code=400, detail="Invalid upload id.")
    path = IMPORT_CACHE_DIR / f"{upload_id}.img"
    if not path.exists():
        raise HTTPException(status_code=404, detail="Uploaded background not found in cache.")
    return path


def get_emby_image_cache_key(item_id: str, image_type: str, index: int | None = None) -> str:
    payload = f"{item_id}:{image_type}:{index if index is not None else 'default'}"
    return hashlib.md5(payload.encode("utf-8")).hexdigest()


def get_emby_image_cache_path(item_id: str, image_type: str, index: int | None = None) -> Path:
    return EMBY_IMAGE_CACHE_DIR / f"{get_emby_image_cache_key(item_id, image_type, index)}.img"


def get_emby_image_miss_path(item_id: str, image_type: str, index: int | None = None) -> Path:
    return EMBY_IMAGE_CACHE_DIR / f"{get_emby_image_cache_key(item_id, image_type, index)}.missing"


def get_fresh_cached_bytes(path: Path, ttl_seconds: int) -> bytes | None:
    if not path.exists():
        return None
    age = time.time() - path.stat().st_mtime
    if age > ttl_seconds:
        return None
    return path.read_bytes()


async def get_cached_emby_source_image(
    item_id: str,
    image_type: str,
    index: int | None = None,
    *,
    optional: bool = False,
) -> bytes | None:
    cache_path = get_emby_image_cache_path(item_id, image_type, index)
    cached_bytes = get_fresh_cached_bytes(cache_path, EMBY_SOURCE_CACHE_TTL)
    if cached_bytes is not None:
        return cached_bytes

    miss_path = get_emby_image_miss_path(item_id, image_type, index)
    if optional and miss_path.exists() and (time.time() - miss_path.stat().st_mtime) <= EMBY_SOURCE_MISS_TTL:
        return None

    image_bytes = (
        await emby_get_image_optional(item_id, image_type, index=index)
        if optional
        else await emby_get_image(item_id, image_type, index=index)
    )
    if image_bytes is None:
        if optional:
            miss_path.touch()
            return None
        raise HTTPException(status_code=404, detail=f"Emby image {image_type} was not found.")

    cache_path.write_bytes(image_bytes)
    if miss_path.exists():
        miss_path.unlink(missing_ok=True)
    return image_bytes


# --- Emby API helpers ---


def apply_settings(values: dict) -> None:
    """Push effective settings into the live module globals the app reads."""
    global EMBY_URL, EMBY_API_KEY
    EMBY_URL = values["emby_url"]
    EMBY_API_KEY = values["emby_api_key"]
    navidrome_service.NAVIDROME_URL = values["navidrome_url"]
    navidrome_service.NAVIDROME_USER = values["navidrome_user"]
    navidrome_service.NAVIDROME_PASSWORD = values["navidrome_password"]
    music_service.MUSIC_ROOT = Path(values["music_root"])


@asynccontextmanager
async def lifespan(app: FastAPI):
    apply_settings(settings_service.load())
    db_service.init_db()
    get_http_client()
    try:
        yield
    finally:
        global http_client
        if http_client is not None:
            await http_client.aclose()
            http_client = None


app = FastAPI(title="HomelabToolkit", lifespan=lifespan)
app.mount("/static", StaticFiles(directory="static"), name="static")

# The React SPA is built to frontend/dist. When present we serve its assets and
# fall back to index.html for client-side routes (see the catch-all near the end).
FRONTEND_DIST = Path("frontend/dist")
if (FRONTEND_DIST / "assets").exists():
    app.mount("/assets", StaticFiles(directory=str(FRONTEND_DIST / "assets")), name="assets")

def get_http_client() -> httpx.AsyncClient:
    global http_client
    if http_client is None:
        http_client = httpx.AsyncClient(timeout=HTTP_TIMEOUT)
    return http_client


async def emby_request(method: str, path: str, *, params: dict | None = None, **kwargs) -> httpx.Response:
    client = get_http_client()
    url = f"{EMBY_URL}{path}"
    p = dict(params or {})
    p["api_key"] = EMBY_API_KEY
    try:
        return await client.request(method, url, params=p, **kwargs)
    except httpx.ReadTimeout as exc:
        raise HTTPException(
            status_code=504,
            detail=f"Emby timed out while requesting {path}. Try again in a moment.",
        ) from exc
    except httpx.ConnectTimeout as exc:
        raise HTTPException(
            status_code=504,
            detail=f"Timed out connecting to Emby at {EMBY_URL}.",
        ) from exc
    except httpx.ConnectError as exc:
        raise HTTPException(
            status_code=502,
            detail=f"Could not connect to Emby at {EMBY_URL}.",
        ) from exc
    except httpx.RequestError as exc:
        raise HTTPException(
            status_code=502,
            detail=f"Emby request failed while requesting {path}: {exc}",
        ) from exc


def ensure_emby_success(response: httpx.Response, *, context: str) -> httpx.Response:
    try:
        response.raise_for_status()
    except httpx.HTTPStatusError as exc:
        detail = response.text.strip() or str(exc)
        raise HTTPException(
            status_code=502,
            detail=f"{context} failed ({response.status_code}): {detail}",
        ) from exc
    return response


async def emby_get(path: str, params: dict = None) -> dict:
    response = await emby_request("GET", path, params=params)
    ensure_emby_success(response, context=f"Emby request to {path}")
    return response.json()


async def emby_get_image(
    item_id: str,
    image_type: str = "Primary",
    index: int | None = None,
    *,
    max_width: int | None = None,
    max_height: int | None = None,
    quality: int | None = None,
) -> bytes:
    params: dict[str, str | int] = {"api_key": EMBY_API_KEY}
    if index is not None:
        params["Index"] = index
    if max_width is not None:
        params["maxWidth"] = max_width
    if max_height is not None:
        params["maxHeight"] = max_height
    if quality is not None:
        params["quality"] = quality
    response = await emby_request("GET", f"/Items/{item_id}/Images/{image_type}", params=params)
    ensure_emby_success(response, context=f"Emby image request for {image_type}")
    return response.content


async def emby_get_image_with_type(
    item_id: str,
    image_type: str = "Primary",
    index: int | None = None,
    *,
    max_width: int | None = None,
    max_height: int | None = None,
    quality: int | None = None,
) -> tuple[bytes, str]:
    params: dict[str, str | int] = {"api_key": EMBY_API_KEY}
    if index is not None:
        params["Index"] = index
    if max_width is not None:
        params["maxWidth"] = max_width
    if max_height is not None:
        params["maxHeight"] = max_height
    if quality is not None:
        params["quality"] = quality
    response = await emby_request("GET", f"/Items/{item_id}/Images/{image_type}", params=params)
    ensure_emby_success(response, context=f"Emby image request for {image_type}")
    content_type = (response.headers.get("content-type", "image/jpeg") or "image/jpeg").split(";")[0]
    return response.content, content_type


async def emby_get_image_optional(item_id: str, image_type: str, index: int | None = None) -> bytes | None:
    """Returns image bytes or None if the image type doesn't exist for this item."""
    params: dict[str, str | int] = {"api_key": EMBY_API_KEY}
    if index is not None:
        params["Index"] = index
    response = await emby_request("GET", f"/Items/{item_id}/Images/{image_type}", params=params)
    if response.status_code in (404, 400):
        return None
    ensure_emby_success(response, context=f"Optional Emby image request for {image_type}")
    content_type = response.headers.get("content-type", "").lower()
    if content_type and not content_type.startswith("image/"):
        return None
    return response.content


async def emby_upload_image(item_id: str, image_bytes: bytes, image_type: str = "Thumb"):
    upload_buf = io.BytesIO()
    upload_image = load_image_from_bytes(image_bytes, mode="RGB")
    upload_image.save(upload_buf, format="JPEG", quality=92, optimize=True)
    upload_b64 = base64.b64encode(upload_buf.getvalue())

    response = await emby_request(
        "POST",
        f"/Items/{item_id}/Images/{image_type}",
        params={"api_key": EMBY_API_KEY},
        content=upload_b64,
        headers={
            "Content-Type": "image/jpeg",
            "X-Emby-Token": EMBY_API_KEY,
        },
    )
    ensure_emby_success(response, context=f"Emby upload for {image_type}")
    return response.status_code


async def emby_delete_image(item_id: str, image_type: str) -> int:
    response = await emby_request(
        "DELETE",
        f"/Items/{item_id}/Images/{image_type}",
        params={"api_key": EMBY_API_KEY},
        headers={"X-Emby-Token": EMBY_API_KEY},
    )
    return response.status_code




def parse_emby_datetime(value: str | None) -> datetime | None:
    if not value:
        return None
    try:
        parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
    except ValueError:
        return None
    if parsed.tzinfo is None:
        parsed = parsed.replace(tzinfo=timezone.utc)
    return parsed.astimezone(timezone.utc)


def to_emby_iso(value: datetime) -> str:
    return value.astimezone(timezone.utc).isoformat().replace("+00:00", "Z")


async def emby_refresh_backdrops(item_id: str, *, wait_seconds: float = 6.0) -> int:
    """Ask Emby to fetch additional backdrop images for an item, then return the new backdrop count."""
    resp = await emby_request("POST", f"/Items/{item_id}/Refresh", params={
        "MetadataRefreshMode": "None",
        "ImageRefreshMode": "FullRefresh",
        "ReplaceAllImages": "false",
        "ReplaceAllMetadata": "false",
    })
    if resp.status_code not in (200, 204):
        logger.warning("Emby refresh returned %d for item %s", resp.status_code, item_id)
        return 0
    await asyncio.sleep(wait_seconds)
    data = await emby_get("/Items", {
        "Ids": item_id,
        "Fields": "",
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Backdrop",
    })
    backdrop_tags = (data.get("Items") or [{}])[0].get("BackdropImageTags") or []
    return len(backdrop_tags)


async def emby_get_all(path: str, params: dict | None = None, *, page_size: int = 200) -> list[dict]:
    items: list[dict] = []
    start_index = 0
    base_params = dict(params or {})
    while True:
        page = await emby_get(path, {
            **base_params,
            "StartIndex": str(start_index),
            "Limit": str(page_size),
        })
        batch = page.get("Items", [])
        items.extend(batch)
        total = int(page.get("TotalRecordCount", start_index + len(batch)))
        if not batch or start_index + len(batch) >= total:
            break
        start_index += len(batch)
    return items


def get_week_bounds(now: datetime, week_offset: int) -> tuple[datetime, datetime]:
    week_start = (now - timedelta(days=now.weekday())).replace(hour=0, minute=0, second=0, microsecond=0)
    week_start = week_start + timedelta(weeks=week_offset)
    return week_start, week_start + timedelta(days=7)


async def build_airing_snapshot(week_offset: int = 0) -> dict:
    now = datetime.now(timezone.utc)
    week_start, week_end = get_week_bounds(now, week_offset)
    week_shift_days = max(0, -week_offset) * 7
    eligible_min_days = NEW_SEASON_MIN_AGE_DAYS + week_shift_days
    eligible_max_days = NEW_SEASON_MAX_AGE_DAYS + week_shift_days
    recent_window_start = now - timedelta(days=eligible_max_days)
    recent_window_end = now - timedelta(days=eligible_min_days)
    inference_window_start = now - timedelta(days=max(SEASON_INFERENCE_LOOKBACK_DAYS, eligible_max_days + 35))

    series_task = emby_get_all("/Items", {
        "IncludeItemTypes": "Series",
        "Recursive": "true",
        "SortBy": "SortName",
        "SortOrder": "Ascending",
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo",
    })
    recent_episodes_task = emby_get_all("/Items", {
        "IncludeItemTypes": "Episode",
        "Recursive": "true",
        "SortBy": "PremiereDate",
        "SortOrder": "Descending",
        "MinPremiereDate": to_emby_iso(recent_window_start),
        "MaxPremiereDate": to_emby_iso(recent_window_end),
    })
    recent_season_activity_task = emby_get_all("/Items", {
        "IncludeItemTypes": "Episode",
        "Recursive": "true",
        "SortBy": "PremiereDate",
        "SortOrder": "Ascending",
        "MinPremiereDate": to_emby_iso(inference_window_start),
        "MaxPremiereDate": to_emby_iso(now + timedelta(days=1)),
    })
    selected_week_episodes_task = emby_get_all("/Items", {
        "IncludeItemTypes": "Episode",
        "Recursive": "true",
        "SortBy": "PremiereDate",
        "SortOrder": "Ascending",
        "MinPremiereDate": to_emby_iso(week_start),
        "MaxPremiereDate": to_emby_iso(week_end),
    })
    upcoming_episodes_task = emby_get_all("/Shows/Upcoming", {
        "SortBy": "PremiereDate",
        "SortOrder": "Ascending",
        "MinPremiereDate": to_emby_iso(now - timedelta(hours=12)),
    })

    series_items, recent_episodes, recent_season_activity, selected_week_episodes, upcoming_episodes = await asyncio.gather(
        series_task,
        recent_episodes_task,
        recent_season_activity_task,
        selected_week_episodes_task,
        upcoming_episodes_task,
        return_exceptions=True,
    )

    if isinstance(series_items, Exception):
        raise series_items
    if isinstance(recent_episodes, Exception):
        recent_episodes = []
    if isinstance(recent_season_activity, Exception):
        recent_season_activity = []
    if isinstance(selected_week_episodes, Exception):
        selected_week_episodes = []
    if isinstance(upcoming_episodes, Exception):
        upcoming_episodes = []

    recent_premieres_by_series: dict[str, dict] = {}
    for episode in recent_episodes:
        series_id = episode.get("SeriesId")
        season_number = int(episode.get("ParentIndexNumber") or 0)
        episode_number = int(episode.get("IndexNumber") or 0)
        premiere_at = parse_emby_datetime(episode.get("PremiereDate"))
        if not series_id or season_number < 2 or episode_number != 1 or premiere_at is None:
            continue
        existing = recent_premieres_by_series.get(series_id)
        if existing is None or premiere_at > existing["premiere_at"]:
            recent_premieres_by_series[series_id] = {
                "premiere_at": premiere_at,
                "season_number": season_number,
                "episode_id": episode.get("Id"),
                "episode_name": episode.get("Name") or "",
            }

    earliest_seen_by_series_season: dict[tuple[str, int], dict] = {}
    for episode in recent_season_activity:
        series_id = episode.get("SeriesId")
        season_number = int(episode.get("ParentIndexNumber") or 0)
        episode_number = int(episode.get("IndexNumber") or 0)
        premiere_at = parse_emby_datetime(episode.get("PremiereDate"))
        if not series_id or season_number < 2 or premiere_at is None:
            continue
        key = (series_id, season_number)
        existing = earliest_seen_by_series_season.get(key)
        if existing is None or premiere_at < existing["premiere_at"]:
            earliest_seen_by_series_season[key] = {
                "premiere_at": premiere_at,
                "season_number": season_number,
                "episode_number": episode_number,
                "episode_name": episode.get("Name") or "",
            }

    selected_week_by_series: dict[str, dict] = {}
    for episode in selected_week_episodes:
        series_id = episode.get("SeriesId")
        premiere_at = parse_emby_datetime(episode.get("PremiereDate"))
        if not series_id or premiere_at is None:
            continue
        existing = selected_week_by_series.get(series_id)
        if existing is None or premiere_at < existing["premiere_at"]:
            season_number = int(episode.get("ParentIndexNumber") or 0)
            episode_number = int(episode.get("IndexNumber") or 0)
            selected_week_by_series[series_id] = {
                "premiere_at": premiere_at,
                "season_number": season_number,
                "episode_number": episode_number,
                "episode_name": episode.get("Name") or "",
            }

    upcoming_by_series: dict[str, dict] = {}
    for episode in upcoming_episodes:
        series_id = episode.get("SeriesId")
        premiere_at = parse_emby_datetime(episode.get("PremiereDate"))
        if not series_id or premiere_at is None:
            continue
        existing = upcoming_by_series.get(series_id)
        if existing is None or premiere_at < existing["premiere_at"]:
            season_number = int(episode.get("ParentIndexNumber") or 0)
            episode_number = int(episode.get("IndexNumber") or 0)
            upcoming_by_series[series_id] = {
                "premiere_at": premiere_at,
                "season_number": season_number,
                "episode_number": episode_number,
                "episode_name": episode.get("Name") or "",
            }

    results: list[dict] = []
    for series in series_items:
        series_id = series.get("Id")
        if not series_id:
            continue
        recent_premiere = recent_premieres_by_series.get(series_id)
        selected_week_episode = selected_week_by_series.get(series_id)
        upcoming = upcoming_by_series.get(series_id)
        status = (series.get("Status") or "").strip()
        is_current_airing = (
            status.lower() == "continuing"
            or selected_week_episode is not None
            or upcoming is not None
            or recent_premiere is not None
        )
        if not is_current_airing:
            continue

        air_days = series.get("AirDays") or []
        if isinstance(air_days, str):
            air_days = [part.strip() for part in air_days.split(",") if part.strip()]

        active_season_number = max(
            recent_premiere["season_number"] if recent_premiere else 0,
            selected_week_episode["season_number"] if selected_week_episode else 0,
            upcoming["season_number"] if upcoming else 0,
        )
        inferred_recent_premiere = None
        if recent_premiere is None and active_season_number >= 2 and (selected_week_episode is not None or upcoming is not None):
            inferred_recent_premiere = earliest_seen_by_series_season.get((series_id, active_season_number))

        season_start = recent_premiere or inferred_recent_premiere
        days_since_premiere = None
        if season_start is not None:
            days_since_premiere = max(0, int((now - season_start["premiere_at"]).total_seconds() // 86400))
        has_current_airing_signal = status.lower() == "continuing" and (
            selected_week_episode is not None or upcoming is not None
        )
        has_recent_season_start_signal = (
            status.lower() == "continuing"
            and (selected_week_episode is not None or upcoming is not None)
            and days_since_premiere is not None
            and eligible_min_days <= days_since_premiere <= eligible_max_days
        )
        eligible_new_season = has_current_airing_signal or has_recent_season_start_signal
        season_premiere_inferred = recent_premiere is None and inferred_recent_premiere is not None
        eligibility_reason = (
            "current_airing"
            if has_current_airing_signal
            else ("recent_season_start" if has_recent_season_start_signal else None)
        )

        next_air_at = upcoming["premiere_at"] if upcoming else None
        results.append({
            "id": series_id,
            "name": series.get("Name", ""),
            "year": series.get("ProductionYear"),
            "status": status or ("Continuing" if upcoming else "Unknown"),
            "air_days": air_days,
            "poster_url": f"/api/poster/{series_id}?w=180&h=270&q=84",
            "has_logo": "Logo" in (series.get("ImageTags") or {}),
            "selected_week_air_at": to_emby_iso(selected_week_episode["premiere_at"]) if selected_week_episode else None,
            "selected_week_episode_label": (
                f"S{selected_week_episode['season_number']}E{selected_week_episode['episode_number']} · {selected_week_episode['episode_name']}".strip(" ·")
                if selected_week_episode and selected_week_episode["season_number"] and selected_week_episode["episode_number"]
                else (selected_week_episode["episode_name"] if selected_week_episode else None)
            ),
            "next_air_at": to_emby_iso(next_air_at) if next_air_at else None,
            "next_episode_label": (
                f"S{upcoming['season_number']}E{upcoming['episode_number']} · {upcoming['episode_name']}".strip(" ·")
                if upcoming and upcoming["season_number"] and upcoming["episode_number"]
                else (upcoming["episode_name"] if upcoming else None)
            ),
            "season_number": season_start["season_number"] if season_start else None,
            "season_premiere_at": to_emby_iso(season_start["premiere_at"]) if season_start else None,
            "season_premiere_episode": season_start["episode_name"] if season_start else None,
            "days_since_season_premiere": days_since_premiere,
            "season_premiere_inferred": season_premiere_inferred,
            "eligibility_reason": eligibility_reason,
            "eligible_new_season": eligible_new_season,
        })

    results.sort(key=lambda item: (
        0 if item["eligible_new_season"] else 1,
        item["selected_week_air_at"] is None and item["next_air_at"] is None,
        item["selected_week_air_at"] or item["next_air_at"] or "",
        item["name"].lower(),
    ))
    return {
        "items": results,
        "generated_at": to_emby_iso(now),
        "week_start": to_emby_iso(week_start),
        "week_end": to_emby_iso(week_end),
        "week_offset": week_offset,
        "new_season_min_days": eligible_min_days,
        "new_season_max_days": eligible_max_days,
    }


async def get_airing_snapshot(force_refresh: bool = False, week_offset: int = 0) -> dict:
    cached = airing_lookup_cache.get(week_offset)
    if not force_refresh and cached and cached["expires_at"] > time.time():
        return cached["data"]

    async with airing_lookup_lock:
        cached = airing_lookup_cache.get(week_offset)
        if not force_refresh and cached and cached["expires_at"] > time.time():
            return cached["data"]
        data = await build_airing_snapshot(week_offset=week_offset)
        airing_lookup_cache[week_offset] = {
            "expires_at": time.time() + AIRING_LOOKUP_CACHE_TTL,
            "data": data,
        }
        return data


def can_apply_new_season_snapshot_item(item: dict) -> bool:
    return bool(item.get("eligible_new_season")) or (
        (item.get("status") or "").strip().lower() == "continuing"
        and (item.get("selected_week_air_at") or item.get("next_air_at"))
    )


async def apply_new_season_artwork_for_snapshot_item(
    item: dict,
    *,
    title: str | None = None,
    generate_primary: bool = True,
) -> dict:
    item_id = item["id"]
    if not can_apply_new_season_snapshot_item(item):
        raise HTTPException(status_code=400, detail="Series is not eligible for New Season artwork.")
    if not item.get("has_logo"):
        raise HTTPException(status_code=400, detail="Series requires an Emby logo before New Season artwork can be applied.")

    title = title or item["name"]
    item_summary = await get_item_summary(item_id)
    auto_studio = infer_auto_studio_key(item_summary or {})
    effective_studio = auto_studio or "none"
    effective_studio_position = "top-left"

    cache_key = build_cache_key(
        item_id=item_id,
        bg_mode="backdrop",
        backdrop_index=0,
        text_color="#FFFFFF",
        logo_align="bottom-center",
        logo_scale=1.3,
        darkness=0.0,
        studio=effective_studio,
        studio_position=effective_studio_position,
        new_episodes_tag=True,
        season_finale_tag=False,
        logo_index=0,
    )
    thumb_cache_path = get_thumb_cache_path(cache_key)
    primary_cache_path = get_primary_cache_path(cache_key)

    if not thumb_cache_path.exists() or (generate_primary and not primary_cache_path.exists()):
        poster_bytes = await emby_get_image(item_id, "Primary")
        logo_bytes = await emby_get_image_optional(item_id, "Logo", 0)
        if logo_bytes is None:
            raise HTTPException(status_code=400, detail="Series requires an Emby logo before New Season artwork can be applied.")
        backdrop_bytes = await emby_get_image_optional(item_id, "Backdrop", 0)
        thumb_bytes = generate_thumbnail(
            poster_bytes,
            title,
            bg_mode="backdrop",
            text_color="#FFFFFF",
            logo_align="bottom-center",
            logo_scale=1.3,
            darkness=0.0,
            studio=effective_studio,
            studio_position=effective_studio_position,
            new_episodes_tag=True,
            season_finale_tag=False,
            logo_index=0,
            logo_bytes=logo_bytes,
            backdrop_bytes=backdrop_bytes,
        )
        thumb_cache_path.write_bytes(thumb_bytes)
        if generate_primary:
            primary_bytes = generate_primary_cover(
                poster_bytes,
                title,
                bg_mode="backdrop",
                text_color="#FFFFFF",
                logo_align="bottom-center",
                logo_scale=1.3,
                darkness=0.0,
                studio=effective_studio,
                studio_position=effective_studio_position,
                new_episodes_tag=True,
                season_finale_tag=False,
                logo_index=0,
                logo_bytes=logo_bytes,
            )
            primary_cache_path.write_bytes(primary_bytes)

    thumb_status = await emby_upload_image(item_id, thumb_cache_path.read_bytes(), "Thumb")

    primary_status = None
    primary_error = None
    if generate_primary:
        try:
            primary_status = await emby_upload_image(item_id, primary_cache_path.read_bytes(), "Primary")
        except Exception as exc:
            primary_error = str(exc)

    return {
        "status": "applied",
        "thumb_code": thumb_status,
        "primary_code": primary_status,
        "primary_attempted": generate_primary,
        "primary_error": primary_error,
    }


def can_bulk_assign_series_item(item: dict) -> bool:
    return bool(item.get("has_logo")) and bool(item.get("has_backdrop"))


def build_bulk_assign_series_options(item_id: str, title: str) -> dict:
    return {
        "item_id": item_id,
        "title": title,
        "bg_mode": "backdrop",
        "backdrop_index": 0,
        "text_color": "#FFFFFF",
        "logo_align": "bottom-center",
        "logo_scale": 1.3,
        "darkness": 0.0,
        "studio": "auto",
        "studio_position": "top-left",
        "new_episodes_tag": False,
        "season_finale_tag": False,
        "generate_primary": False,
        "logo_index": 0,
        "primary_zoom": 1.0,
        "primary_pan_x": 0.0,
        "primary_pan_y": -0.16,
        "thumb_zoom": 1.0,
        "thumb_pan_x": 0.0,
        "thumb_pan_y": 0.0,
        "upload_bg_id": None,
    }


async def stamp_studio_logo_on_poster(item_id: str, studio: str, studio_position: str = "top-left") -> int:
    """Fetch the clean original poster, stamp the studio logo, and re-upload."""
    logger.info("  Stamping poster  : studio=%s  position=%s", studio, studio_position)
    clean_path = CLEAN_POSTER_CACHE_DIR / f"{item_id}.img"
    if clean_path.exists():
        poster_bytes = clean_path.read_bytes()
        logger.info("  Poster source    : clean cache hit for %s", item_id)
    else:
        # Primary may be temporarily absent if Emby is mid-refresh after a reset.
        # Retry a few times with a short wait before giving up.
        poster_bytes = None
        for attempt in range(4):
            poster_bytes = await emby_get_image_optional(item_id, "Primary")
            if poster_bytes:
                break
            if attempt < 3:
                logger.info("  Poster source    : Primary not ready (attempt %d/4), waiting…", attempt + 1)
                await asyncio.sleep(5)
        if not poster_bytes:
            logger.warning("  Poster stamp skipped: no Primary image found in Emby for item %s after retries", item_id)
            return 0
        clean_path.write_bytes(poster_bytes)
        logger.info("  Poster source    : saved clean baseline for %s", item_id)
    img = load_image_from_bytes(poster_bytes, mode="RGB")
    w, h = img.size
    logo_max_h = max(70, int(w * 0.09))
    slogo = make_studio_logo(studio, max_height=logo_max_h)
    if not slogo:
        logo_path = STUDIO_FILES.get(studio)
        logger.warning("  Poster stamp skipped: logo file not found for studio=%s  path=%s", studio, logo_path)
        return 0
    if studio == "paramountplus":
        slogo = round_image_corners(slogo, radius=max(6, slogo.height // 5))
    if studio == "appletv":
        slogo = slogo.filter(ImageFilter.UnsharpMask(radius=1.0, percent=180, threshold=2))
    s_pad = max(20, int(w * 0.025))
    sw, sh = slogo.size
    positions = {
        "top-left":     (s_pad, s_pad),
        "top-right":    (w - sw - s_pad, s_pad),
        "bottom-left":  (s_pad, h - sh - s_pad),
        "bottom-right": (w - sw - s_pad, h - sh - s_pad),
    }
    sx, sy = positions.get(studio_position, positions["top-left"])
    if studio == "appletv":
        glow_pad = 10
        shadow_crop = Image.new("RGBA", (sw + glow_pad * 2, sh + glow_pad * 2), (0, 0, 0, 0))
        black = Image.new("RGBA", slogo.size, (0, 0, 0, 160))
        alpha = slogo.getchannel("A")
        shadow_badge = Image.merge("RGBA", (*black.split()[:3], alpha))
        shadow_crop.paste(shadow_badge, (glow_pad + 2, glow_pad + 2), shadow_badge)
        shadow_crop = shadow_crop.filter(ImageFilter.GaussianBlur(6))
        img = img.convert("RGBA")
        img.alpha_composite(shadow_crop, (sx - glow_pad, sy - glow_pad))
        img = img.convert("RGB")
    img.paste(slogo, (sx, sy), slogo)
    status = await emby_upload_image(item_id, encode_jpeg_bytes(img), "Primary")
    logger.info("  Poster stamped   : status=%d", status)
    return status


async def apply_bulk_assign_series_thumb(item: dict, *, backdrop_index: int = 0) -> dict:
    if not can_bulk_assign_series_item(item):
        raise HTTPException(status_code=400, detail="Series requires Emby primary, logo, and backdrop images before bulk assign can apply.")

    options = await apply_auto_studio_defaults(build_bulk_assign_series_options(item["id"], item["name"]))
    options["backdrop_index"] = backdrop_index

    logger.info("  Rendering thumb  : %s  (backdrop #%d)", item["name"], backdrop_index)

    # Thumb
    cache_key = get_generator_cache_key(options)
    thumb_cache_path = get_thumb_cache_path(cache_key)
    if not thumb_cache_path.exists():
        thumb_bytes, _ = await render_item_artwork(options, fallback_logo_to_first=True)
        thumb_cache_path.write_bytes(thumb_bytes)
    thumb_status = await emby_upload_image(item["id"], thumb_cache_path.read_bytes(), "Thumb")

    # Poster — stamp logo on existing primary image
    studio = options.get("studio") or "none"
    poster_status = 0
    if studio and studio != "none":
        try:
            poster_status = await stamp_studio_logo_on_poster(
                item["id"], studio, options.get("studio_position", "top-left")
            )
        except Exception as exc:
            logger.error("  Poster stamp failed for %s: %s", item["name"], exc)

    logger.info("  Done             : %s  (thumb=%d, poster=%d)", item["name"], thumb_status, poster_status)
    return {
        "status": "applied",
        "thumb_code": thumb_status,
        "poster_code": poster_status,
    }


# --- Image helpers ---

def cover_crop(img: Image.Image, width: int, height: int) -> Image.Image:
    """Scale and center-crop image to exactly width x height."""
    return ImageOps.fit(
        img,
        (width, height),
        method=Image.LANCZOS,
        centering=(0.5, 0.5),
    )


def cover_crop_positioned(
    img: Image.Image,
    width: int,
    height: int,
    *,
    zoom: float = 1.0,
    pan_x: float = 0.0,
    pan_y: float = 0.0,
) -> Image.Image:
    """Cover-crop with user-controlled zoom and pan.

    `pan_x` / `pan_y` are normalized in [-1, 1], where -1 means left/top and
    +1 means right/bottom.
    """
    pan_x = max(-1.0, min(1.0, float(pan_x)))
    pan_y = max(-1.0, min(1.0, float(pan_y)))
    zoom = max(PRIMARY_MIN_ZOOM, min(PRIMARY_MAX_ZOOM, float(zoom)))

    target_ratio = width / max(1, height)
    source_ratio = img.width / max(1, img.height)

    if source_ratio > target_ratio:
        crop_h = img.height
        crop_w = int(round(crop_h * target_ratio))
    else:
        crop_w = img.width
        crop_h = int(round(crop_w / target_ratio))

    crop_w = max(1, min(img.width, int(round(crop_w / zoom))))
    crop_h = max(1, min(img.height, int(round(crop_h / zoom))))

    max_left = max(0, img.width - crop_w)
    max_top = max(0, img.height - crop_h)

    left = int(round((max_left / 2) * (pan_x + 1.0)))
    top = int(round((max_top / 2) * (pan_y + 1.0)))

    cropped = img.crop((left, top, left + crop_w, top + crop_h))
    return cropped.resize((width, height), Image.LANCZOS)


def build_tall_backdrop_background(
    img: Image.Image,
    width: int,
    height: int,
    *,
    dim_factor: float,
    zoom: float = 1.0,
    pan_x: float = 0.0,
    pan_y: float = -0.16,
) -> Image.Image:
    base = cover_crop_positioned(img, width, height, zoom=zoom, pan_x=pan_x, pan_y=pan_y)
    return base.point(lambda p: int(p * dim_factor))


def get_font(size: int, bold: bool = False) -> ImageFont.FreeTypeFont:
    font_paths = [
        # Windows
        "C:/Windows/Fonts/arialbd.ttf" if bold else "C:/Windows/Fonts/arial.ttf",
        "C:/Windows/Fonts/calibrib.ttf" if bold else "C:/Windows/Fonts/calibri.ttf",
        "C:/Windows/Fonts/verdanab.ttf" if bold else "C:/Windows/Fonts/verdana.ttf",
        # Linux
        "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf" if bold else "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
        "/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf" if bold else "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf",
    ]
    for fp in font_paths:
        if os.path.exists(fp):
            return ImageFont.truetype(fp, size)
    return ImageFont.load_default(size)


def get_arial_bold_font(size: int) -> ImageFont.FreeTypeFont:
    font_paths = [
        "C:/Windows/Fonts/arialbd.ttf",
        "/usr/share/fonts/truetype/msttcorefonts/Arial_Bold.ttf",
        "/usr/share/fonts/truetype/liberation2/LiberationSans-Bold.ttf",
        "/usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf",
        "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf",
    ]
    for fp in font_paths:
        if os.path.exists(fp):
            return ImageFont.truetype(fp, size)
    return get_font(size, bold=True)


def get_badge_font(size: int) -> ImageFont.FreeTypeFont:
    font_paths = [
        "C:/Windows/Fonts/ariblk.ttf",
        "C:/Windows/Fonts/arialbd.ttf",
        "C:/Windows/Fonts/seguisb.ttf",
        "/usr/share/fonts/truetype/liberation2/LiberationSans-Bold.ttf",
        "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf",
    ]
    for fp in font_paths:
        if os.path.exists(fp):
            return ImageFont.truetype(fp, size)
    return get_arial_bold_font(size)


def measure_tracked_text(text: str, font: ImageFont.FreeTypeFont, tracking: int) -> tuple[int, int]:
    widths = []
    top = 0
    bottom = 0
    for ch in text:
        bbox = font.getbbox(ch)
        widths.append(bbox[2] - bbox[0])
        top = min(top, bbox[1])
        bottom = max(bottom, bbox[3])
    if not widths:
        return 0, 0
    width = sum(widths) + tracking * max(0, len(widths) - 1)
    height = bottom - top
    return width, height


def draw_tracked_text(
    draw: ImageDraw.ImageDraw,
    position: tuple[int, int],
    text: str,
    font: ImageFont.FreeTypeFont,
    fill: tuple[int, int, int],
    tracking: int,
) -> None:
    x, y = position
    for ch in text:
        bbox = font.getbbox(ch)
        draw.text((x - bbox[0], y - bbox[1]), ch, font=font, fill=fill)
        x += (bbox[2] - bbox[0]) + tracking


def wrap_text(text: str, font: ImageFont.FreeTypeFont, max_width: int) -> list:
    words = text.split()
    lines, current = [], ""
    for word in words:
        test = f"{current} {word}".strip()
        if font.getbbox(test)[2] <= max_width:
            current = test
        else:
            if current:
                lines.append(current)
            current = word
    if current:
        lines.append(current)
    return lines


def parse_generator_request(body: dict) -> dict:
    logo_index_raw = body.get("logo_index", None)
    logo_index = int(logo_index_raw) if logo_index_raw is not None else None
    return {
        "item_id": body["item_id"],
        "title": body.get("title", ""),
        "bg_mode": body.get("bg_mode", "backdrop"),
        "backdrop_index": int(body.get("backdrop_index", 0)),
        "text_color": body.get("text_color", "#FFFFFF"),
        "logo_align": body.get("logo_align", "bottom-center"),
        "logo_scale": float(body.get("logo_scale", 1.3)),
        "darkness": float(body.get("darkness", 0.0)),
        "studio": body["studio"] if "studio" in body else "auto",
        "studio_position": body.get("studio_position", "top-left"),
        "new_episodes_tag": bool(body.get("new_episodes_tag", False)),
        "season_finale_tag": bool(body.get("season_finale_tag", False)),
        "generate_primary": bool(body.get("generate_primary", False)),
        "logo_index": logo_index,
        "primary_zoom": float(body.get("primary_zoom", 1.0)),
        "primary_pan_x": float(body.get("primary_pan_x", 0.0)),
        "primary_pan_y": float(body.get("primary_pan_y", -0.16)),
        "thumb_zoom": float(body.get("thumb_zoom", 1.0)),
        "thumb_pan_x": float(body.get("thumb_pan_x", 0.0)),
        "thumb_pan_y": float(body.get("thumb_pan_y", 0.0)),
        "upload_bg_id": body.get("upload_bg_id") or None,
    }


async def get_logo_bytes_for_item(
    item_id: str,
    preferred_index: int | None,
    *,
    fallback_to_first: bool = False,
) -> bytes | None:
    if preferred_index is not None and preferred_index < 0:
        return None
    if preferred_index is not None:
        logo_bytes = await get_cached_emby_source_image(item_id, "Logo", preferred_index, optional=True)
        if logo_bytes or not fallback_to_first or preferred_index == 0:
            return logo_bytes
    fallback_index = 0 if fallback_to_first else preferred_index
    if fallback_index is not None and fallback_index < 0:
        return None
    return await get_cached_emby_source_image(item_id, "Logo", fallback_index, optional=True)


async def render_item_artwork(options: dict, *, fallback_logo_to_first: bool = False) -> tuple[bytes, bytes | None]:
    poster_bytes = await get_cached_emby_source_image(options["item_id"], "Primary", optional=True)
    logo_bytes = await get_logo_bytes_for_item(
        options["item_id"],
        options["logo_index"],
        fallback_to_first=fallback_logo_to_first,
    )
    if options["bg_mode"] == "upload" and options["upload_bg_id"]:
        upload_path = get_upload_cache_path(options["upload_bg_id"])
        backdrop_bytes = upload_path.read_bytes()
    else:
        backdrop_bytes = await get_cached_emby_source_image(
            options["item_id"],
            "Backdrop",
            options["backdrop_index"],
            optional=True,
        )

    effective_bg_mode = "backdrop" if options["bg_mode"] == "upload" else options["bg_mode"]
    thumb_bytes = generate_thumbnail(
        poster_bytes,
        options["title"],
        bg_mode=effective_bg_mode,
        text_color=options["text_color"],
        logo_align=options["logo_align"],
        logo_scale=options["logo_scale"],
        darkness=options["darkness"],
        studio=options["studio"],
        studio_position=options["studio_position"],
        new_episodes_tag=options["new_episodes_tag"],
        season_finale_tag=options["season_finale_tag"],
        logo_index=options["logo_index"],
        logo_bytes=logo_bytes,
        backdrop_bytes=backdrop_bytes,
        primary_zoom=options["primary_zoom"],
        primary_pan_x=options["primary_pan_x"],
        primary_pan_y=options["primary_pan_y"],
        thumb_zoom=options["thumb_zoom"],
        thumb_pan_x=options["thumb_pan_x"],
        thumb_pan_y=options["thumb_pan_y"],
    )

    primary_bytes = None
    if options["generate_primary"]:
        try:
            primary_bytes = generate_primary_cover(
                poster_bytes,
                options["title"],
                bg_mode=effective_bg_mode,
                text_color=options["text_color"],
                logo_align=options["logo_align"],
                logo_scale=options["logo_scale"],
                darkness=options["darkness"],
                studio=options["studio"],
                studio_position=options["studio_position"],
                new_episodes_tag=options["new_episodes_tag"],
                season_finale_tag=options["season_finale_tag"],
                logo_index=options["logo_index"],
                logo_bytes=logo_bytes,
                backdrop_bytes=backdrop_bytes,
                primary_zoom=options["primary_zoom"],
                primary_pan_x=options["primary_pan_x"],
                primary_pan_y=options["primary_pan_y"],
            )
        except Exception:
            primary_bytes = None
    return thumb_bytes, primary_bytes


def get_generator_cache_key(options: dict) -> str:
    return build_cache_key(
        item_id=options["item_id"],
        bg_mode=options["bg_mode"],
        backdrop_index=options["backdrop_index"],
        text_color=options["text_color"],
        logo_align=options["logo_align"],
        logo_scale=options["logo_scale"],
        darkness=options["darkness"],
        studio=options["studio"],
        studio_position=options["studio_position"],
        new_episodes_tag=options["new_episodes_tag"],
        season_finale_tag=options["season_finale_tag"],
        logo_index=options["logo_index"],
        primary_zoom=options["primary_zoom"],
        primary_pan_x=options["primary_pan_x"],
        primary_pan_y=options["primary_pan_y"],
        thumb_zoom=options["thumb_zoom"],
        thumb_pan_x=options["thumb_pan_x"],
        thumb_pan_y=options["thumb_pan_y"],
        upload_bg_id=options["upload_bg_id"],
    )


def build_cache_key(
    item_id: str,
    bg_mode: str = "backdrop",
    backdrop_index: int = 0,
    text_color: str = "#FFFFFF",
    logo_align: str = "bottom-center",
    logo_scale: float = 1.3,
    darkness: float = 0.0,
    studio: str = "none",
    studio_position: str = "top-left",
    new_episodes_tag: bool = False,
    season_finale_tag: bool = False,
    logo_index: int | None = None,
    primary_zoom: float = 1.0,
    primary_pan_x: float = 0.0,
    primary_pan_y: float = -0.16,
    thumb_zoom: float = 1.0,
    thumb_pan_x: float = 0.0,
    thumb_pan_y: float = 0.0,
    upload_bg_id: str | None = None,
) -> str:
    payload = {
        "render_version": RENDER_VERSION,
        "item_id": item_id,
        "bg_mode": bg_mode,
        "backdrop_index": int(backdrop_index),
        "text_color": text_color,
        "logo_align": logo_align,
        "logo_scale": round(float(logo_scale), 4),
        "darkness": round(float(darkness), 4),
        "studio": studio,
        "studio_position": studio_position,
        "new_episodes_tag": bool(new_episodes_tag),
        "season_finale_tag": bool(season_finale_tag),
        "logo_index": logo_index,
        "primary_zoom": round(float(primary_zoom), 4),
        "primary_pan_x": round(float(primary_pan_x), 4),
        "primary_pan_y": round(float(primary_pan_y), 4),
        "thumb_zoom": round(float(thumb_zoom), 4),
        "thumb_pan_x": round(float(thumb_pan_x), 4),
        "thumb_pan_y": round(float(thumb_pan_y), 4),
        "upload_bg_id": upload_bg_id,
    }
    return hashlib.md5(repr(payload).encode("utf-8")).hexdigest()


def get_thumb_cache_path(cache_key: str) -> Path:
    return CACHE_DIR / f"{cache_key}.png"


def get_primary_cache_path(cache_key: str) -> Path:
    return CACHE_DIR / f"{cache_key}.primary.png"


def generate_thumbnail(
    poster_bytes: bytes,
    title: str,
    bg_mode: str = "backdrop",
    text_color: str = "#FFFFFF",
    logo_align: str = "bottom-center",
    logo_scale: float = 1.3,
    darkness: float = 0.0,
    studio: str = "none",
    studio_position: str = "top-left",
    new_episodes_tag: bool = False,
    season_finale_tag: bool = False,
    logo_index: int | None = None,
    width: int = THUMB_WIDTH,
    height: int = THUMB_HEIGHT,
    logo_bytes: bytes = None,
    backdrop_bytes: bytes = None,
    primary_zoom: float = 1.0,
    primary_pan_x: float = 0.0,
    primary_pan_y: float = -0.16,
    thumb_zoom: float = 1.0,
    thumb_pan_x: float = 0.0,
    thumb_pan_y: float = 0.0,
) -> bytes:

    # darkness is 0.0 (no dimming) → 1.0 (very dark); scale bg and vignette together
    d = max(0.0, min(1.0, darkness))
    bg_dim = 1.0 - (d * 0.6)          # backdrop brightness: 1.0 → 0.4
    vig_max = int(d * 220)             # vignette peak alpha: 0 → 220
    is_tall_layout = height >= int(width * 1.3)

    # --- Build background ---
    if backdrop_bytes:
        backdrop = load_image_from_bytes(backdrop_bytes, mode="RGB")
        if is_tall_layout:
            bg = build_tall_backdrop_background(
                backdrop,
                width,
                height,
                dim_factor=bg_dim,
                zoom=primary_zoom,
                pan_x=primary_pan_x,
                pan_y=primary_pan_y,
            )
        else:
            bg = cover_crop_positioned(backdrop, width, height, zoom=thumb_zoom, pan_x=thumb_pan_x, pan_y=thumb_pan_y)
            bg = bg.point(lambda p: int(p * bg_dim))
    else:
        if not poster_bytes:
            bg = Image.new("RGB", (width, height), (20, 20, 28))
            bg = bg.point(lambda p: int(p * bg_dim))
            poster = None
        else:
            poster = load_image_from_bytes(poster_bytes, mode="RGB")
        if poster is not None:
            if is_tall_layout:
                bg = build_tall_backdrop_background(
                    poster,
                    width,
                    height,
                    dim_factor=bg_dim,
                    zoom=primary_zoom,
                    pan_x=primary_pan_x,
                    pan_y=primary_pan_y,
                )
            else:
                # Blurred poster fallback for landscape thumbs.
                bg = cover_crop_positioned(poster, width, height, zoom=thumb_zoom, pan_x=thumb_pan_x, pan_y=thumb_pan_y)
                bg = bg.filter(ImageFilter.GaussianBlur(radius=20))
                bg = bg.point(lambda p: int(p * bg_dim * 0.85))

    # --- Vignette overlay tuned per logo position ---
    overlay = Image.new("RGBA", (width, height), (0, 0, 0, 0))
    ov = ImageDraw.Draw(overlay)

    def h_gradient(from_left: bool, strength: int = 200):
        s = int(strength * d)
        for x in range(width):
            t = 1.0 - (x / max(1, width - 1))
            a = int(s * (t ** 0.55))
            px = x if from_left else width - 1 - x
            ov.line([(px, 0), (px, height)], fill=(0, 0, 0, a))

    def v_gradient_bottom(strength: int = 180):
        s = int(strength * d)
        for y in range(height):
            t = 1.0 - (y / max(1, height - 1))
            a = int(s * (t ** 0.55))
            ov.line([(0, height - 1 - y), (width, height - 1 - y)], fill=(0, 0, 0, a))

    # Base layer: uniform darkening across the whole frame on every layout.
    # This ensures no naturally bright backdrop area is left fully exposed.
    base_alpha = int(vig_max * 0.45)
    ov.rectangle([(0, 0), (width, height)], fill=(0, 0, 0, base_alpha))

    # Directional layer on top for contrast where the logo sits.
    if logo_align == "center":
        ov.rectangle([(0, 0), (width, height)], fill=(0, 0, 0, int(vig_max * 0.25)))
    elif logo_align == "left":
        h_gradient(from_left=True, strength=160)
    elif logo_align == "bottom-center":
        v_gradient_bottom(strength=150)
    elif logo_align == "bottom-left":
        h_gradient(from_left=True, strength=140)
        v_gradient_bottom(strength=140)
    elif logo_align == "bottom-right":
        h_gradient(from_left=False, strength=140)
        v_gradient_bottom(strength=140)

    bg = bg.convert("RGBA")
    bg = Image.alpha_composite(bg, overlay)
    bg = bg.convert("RGB")

    txt_color = ImageColor.getrgb(text_color)
    pad = max(52, int(height * (0.11 if is_tall_layout else 0.08)))
    scale = max(0.4, min(2.5, logo_scale))
    logo_max_w = int(width * 0.46 * scale)
    logo_max_h = int(height * (0.18 if is_tall_layout else 0.40) * scale)
    logo_box = None
    studio_box = None

    def get_series_banner() -> dict | None:
        if season_finale_tag:
            banner_text = "Season Finale"
            banner_fill = "#111111"
        elif new_episodes_tag:
            banner_text = "New Season"
            banner_fill = "#E50914"
        else:
            return None
        banner_font_size = max(72 if is_tall_layout else 58, int(height * (0.048 if is_tall_layout else 0.115)))
        banner_font = get_badge_font(banner_font_size)
        text_bbox = banner_font.getbbox(banner_text)
        text_w = text_bbox[2] - text_bbox[0]
        text_h = text_bbox[3] - text_bbox[1]
        banner_x = 0
        banner_y = 0
        banner_w = width
        vertical_pad = max(12 if is_tall_layout else 12, int(banner_font_size * (0.28 if is_tall_layout else 0.30)))
        banner_h = max(text_h + vertical_pad * 2, int(height * (0.105 if is_tall_layout else 0.17)))
        text_x = (banner_w - text_w) // 2 - text_bbox[0]
        text_y = (banner_h - text_h) // 2 - text_bbox[1]
        return {
            "text": banner_text,
            "fill": ImageColor.getrgb(banner_fill),
            "font": banner_font,
            "x": banner_x,
            "y": banner_y,
            "w": banner_w,
            "h": banner_h,
            "text_x": text_x,
            "text_y": text_y,
        }

    banner = get_series_banner()

    def logo_position(lw: int, lh: int):
        if logo_align == "center":
            return (width - lw) // 2, (height - lh) // 2
        elif logo_align == "left":
            return pad, (height - lh) // 2
        elif logo_align == "bottom-center":
            return (width - lw) // 2, height - lh - pad
        elif logo_align == "bottom-left":
            return pad, height - lh - pad
        elif logo_align == "bottom-right":
            return width - lw - pad, height - lh - pad
        return (width - lw) // 2, (height - lh) // 2

    # --- Logo image (preferred) ---
    if logo_bytes:
        try:
            logo = load_image_from_bytes(logo_bytes, mode="RGBA")
        except (UnidentifiedImageError, OSError, ValueError):
            logo = None
        if logo is None:
            logo_bytes = None
    if logo_bytes:
        ratio = min(logo_max_w / logo.width, logo_max_h / logo.height)
        lw = int(logo.width * ratio)
        lh = int(logo.height * ratio)
        logo = logo.resize((lw, lh), Image.LANCZOS)
        logo_x, logo_y = logo_position(lw, lh)

        # Drop shadow — diffuse glow with no offset for a soft, professional look.
        # Blur only a tight crop around the logo to avoid dark haze on the backdrop.
        blur_r = 11
        pad = blur_r * 3
        _, _, _, a = logo.split()
        black = Image.new("RGB", (lw, lh), (0, 0, 0))
        shadow_logo = Image.merge("RGBA", (*black.split()[:3], a))
        shadow_crop = Image.new("RGBA", (lw + pad * 2, lh + pad * 2), (0, 0, 0, 0))
        shadow_crop.paste(shadow_logo, (pad, pad), shadow_logo)
        shadow_crop = shadow_crop.filter(ImageFilter.GaussianBlur(radius=blur_r))
        bg = bg.convert("RGBA")
        bg.alpha_composite(shadow_crop, (logo_x - pad, logo_y - pad))
        bg = bg.convert("RGB")

        bg.paste(logo, (logo_x, logo_y), logo)
        logo_box = (logo_x, logo_y, lw, lh)

    else:
        # --- Text fallback ---
        draw = ImageDraw.Draw(bg)
        title_font = get_font(56, bold=True)
        line_h = 66
        lines = wrap_text(title.upper(), title_font, logo_max_w)
        total_h = len(lines) * line_h
        tx, ty = logo_position(logo_max_w, total_h)
        for line in lines:
            draw.text((tx + 3, ty + 3), line, font=title_font, fill=(0, 0, 0))
            draw.text((tx, ty), line, font=title_font, fill=txt_color)
            ty += line_h
        logo_box = (tx, logo_position(logo_max_w, total_h)[1], logo_max_w, total_h)

    # --- Studio logo overlay ---
    if studio and studio != "none":
        effective_studio_position = studio_position
        studio_max_height = 63 if studio == "appletv" else 75 if studio == "paramountplus" else 60 if studio == "netflix" else 65
        slogo = make_studio_logo(studio, max_height=studio_max_height)
        if slogo:
            if studio == "paramountplus":
                corner_r = max(6, slogo.height // 5)
                slogo = round_image_corners(slogo, radius=corner_r)
            if studio == "appletv":
                slogo = slogo.filter(ImageFilter.UnsharpMask(radius=1.0, percent=180, threshold=2))
            s_pad = 18 if studio == "appletv" else 22
            sw, sh = slogo.size
            top_y = s_pad if not banner else banner["y"] + banner["h"] + 10
            positions = {
                "top-left":     (s_pad, top_y),
                "top-right":    (width - sw - s_pad, top_y),
                "bottom-left":  (s_pad, height - sh - s_pad),
                "bottom-right": (width - sw - s_pad, height - sh - s_pad),
            }
            sx, sy = positions.get(effective_studio_position, positions["bottom-right"])
            if studio == "appletv":
                # Soft drop-shadow so the wordmark reads cleanly on any backdrop.
                glow_pad = 8
                shadow_crop = Image.new("RGBA", (sw + glow_pad * 2, sh + glow_pad * 2), (0, 0, 0, 0))
                black = Image.new("RGBA", slogo.size, (0, 0, 0, 160))
                alpha = slogo.getchannel("A")
                shadow_badge = Image.merge("RGBA", (*black.split()[:3], alpha))
                shadow_crop.paste(shadow_badge, (glow_pad + 2, glow_pad + 2), shadow_badge)
                shadow_crop = shadow_crop.filter(ImageFilter.GaussianBlur(5))
                bg = bg.convert("RGBA")
                bg.alpha_composite(shadow_crop, (sx - glow_pad, sy - glow_pad))
                bg = bg.convert("RGB")
            bg.paste(slogo, (sx, sy), slogo)
            studio_box = (sx, sy, sw, sh)

    if banner:
        draw = ImageDraw.Draw(bg)
        draw.rectangle(
            [(banner["x"], banner["y"]), (banner["x"] + banner["w"], banner["y"] + banner["h"])],
            fill=banner["fill"],
        )
        draw.text((banner["text_x"], banner["text_y"]), banner["text"], font=banner["font"], fill=(255, 255, 255))

    buf = io.BytesIO()
    bg.save(buf, format="PNG")
    buf.seek(0)
    return buf.getvalue()


def generate_primary_cover(
    poster_bytes: bytes,
    title: str,
    bg_mode: str = "backdrop",
    text_color: str = "#FFFFFF",
    logo_align: str = "bottom-center",
    logo_scale: float = 1.3,
    darkness: float = 0.0,
    studio: str = "none",
    studio_position: str = "top-left",
    new_episodes_tag: bool = False,
    season_finale_tag: bool = False,
    logo_index: int | None = None,
    logo_bytes: bytes | None = None,
    backdrop_bytes: bytes | None = None,
    primary_zoom: float = 1.0,
    primary_pan_x: float = 0.0,
    primary_pan_y: float = -0.16,
) -> bytes:
    # Use the same backdrop_bytes as the thumb (backdrop image or uploaded photo).
    # When none is provided, falls back to using poster_bytes as background.
    return generate_thumbnail(
        poster_bytes,
        title,
        bg_mode=bg_mode,
        text_color=text_color,
        logo_align=logo_align,
        logo_scale=logo_scale,
        darkness=darkness,
        studio=studio,
        studio_position=studio_position,
        new_episodes_tag=new_episodes_tag,
        season_finale_tag=season_finale_tag,
        logo_index=logo_index,
        width=PRIMARY_WIDTH,
        height=PRIMARY_HEIGHT,
        logo_bytes=logo_bytes,
        backdrop_bytes=backdrop_bytes,
        primary_zoom=primary_zoom,
        primary_pan_x=primary_pan_x,
        primary_pan_y=primary_pan_y,
    )


def normalize_collection_target_type(value: str | None) -> str:
    normalized = (value or "Thumb").strip().lower()
    if normalized == "primary":
        return "Primary"
    if normalized == "thumb":
        return "Thumb"
    raise HTTPException(status_code=400, detail="Invalid target type.")


def normalize_collection_choice(value: str | None, allowed: set[str], default: str) -> str:
    normalized = (value or default).strip().lower()
    if normalized not in allowed:
        return default
    return normalized


def normalize_collection_text(value: str | None) -> str:
    text = " ".join((value or "").split())
    if not text:
        raise HTTPException(status_code=400, detail="Text is required.")
    return text[:140]


def clamp_float(value: float, minimum: float, maximum: float) -> float:
    return max(minimum, min(maximum, float(value)))


def get_collection_canvas_size(target_type: str) -> tuple[int, int]:
    return (PRIMARY_WIDTH, PRIMARY_HEIGHT) if target_type == "Primary" else (THUMB_WIDTH, THUMB_HEIGHT)


def build_collection_cache_key(
    *,
    item_id: str,
    target_type: str,
    text: str,
    text_color: str,
    text_align: str,
    text_position: str,
    text_scale: float,
    darkness: float,
    zoom: float,
    pan_x: float,
    pan_y: float,
    upload_bg_id: str | None,
) -> str:
    payload = {
        "render_version": COLLECTION_RENDER_VERSION,
        "item_id": item_id,
        "target_type": target_type,
        "text": text,
        "text_color": text_color,
        "text_align": text_align,
        "text_position": text_position,
        "text_scale": round(float(text_scale), 4),
        "darkness": round(float(darkness), 4),
        "zoom": round(float(zoom), 4),
        "pan_x": round(float(pan_x), 4),
        "pan_y": round(float(pan_y), 4),
        "upload_bg_id": upload_bg_id,
    }
    return hashlib.md5(repr(payload).encode("utf-8")).hexdigest()


def get_collection_cache_path(cache_key: str) -> Path:
    return CACHE_DIR / f"{cache_key}.collection.png"


def build_collection_fallback_background(width: int, height: int) -> Image.Image:
    bg = Image.new("RGB", (width, height), "#121723")
    draw = ImageDraw.Draw(bg)
    for y in range(height):
        t = y / max(1, height - 1)
        r = int(18 + (28 * t))
        g = int(24 + (18 * t))
        b = int(35 + (48 * t))
        draw.line([(0, y), (width, y)], fill=(r, g, b))
    accent_radius = max(width, height) // 2
    accent = Image.new("RGBA", (width, height), (0, 0, 0, 0))
    accent_draw = ImageDraw.Draw(accent)
    accent_draw.ellipse(
        (
            width - accent_radius,
            -accent_radius // 3,
            width + accent_radius // 2,
            accent_radius + accent_radius // 6,
        ),
        fill=(74, 111, 255, 50),
    )
    accent_draw.ellipse(
        (
            -accent_radius // 2,
            height - accent_radius,
            accent_radius,
            height + accent_radius // 3,
        ),
        fill=(52, 211, 153, 34),
    )
    return Image.alpha_composite(bg.convert("RGBA"), accent).convert("RGB")


def fit_collection_text_block(
    text: str,
    *,
    width: int,
    height: int,
    text_scale: float,
) -> tuple[ImageFont.FreeTypeFont, list[str], list[tuple[int, int, int, int]], int]:
    is_tall = height > width
    max_width = width - int(width * 0.12)
    max_height = int(height * (0.54 if is_tall else 0.42))
    max_lines = 5 if is_tall else 3
    base_size = int(height * (0.07 if is_tall else 0.12) * text_scale)
    min_size = 34 if is_tall else 24

    size = max(base_size, min_size)
    while size >= min_size:
        font = get_arial_bold_font(size)
        lines = wrap_text(text, font, max_width)
        boxes = [font.getbbox(line) for line in lines] if lines else []
        heights = [(box[3] - box[1]) for box in boxes]
        line_gap = max(8, int(size * 0.16))
        total_height = sum(heights) + line_gap * max(0, len(lines) - 1)
        if lines and len(lines) <= max_lines and total_height <= max_height:
            return font, lines, boxes, line_gap
        size -= 4

    font = get_arial_bold_font(min_size)
    lines = wrap_text(text, font, max_width)
    boxes = [font.getbbox(line) for line in lines] if lines else []
    line_gap = max(8, int(min_size * 0.16))
    return font, lines or [text], boxes or [font.getbbox(text)], line_gap


def generate_collection_art(
    *,
    source_bytes: bytes | None,
    target_type: str,
    text: str,
    text_color: str,
    text_align: str,
    text_position: str,
    text_scale: float,
    darkness: float,
    zoom: float,
    pan_x: float,
    pan_y: float,
) -> bytes:
    width, height = get_collection_canvas_size(target_type)
    darkness = clamp_float(darkness, 0.0, 1.0)
    zoom = clamp_float(zoom, PRIMARY_MIN_ZOOM, PRIMARY_MAX_ZOOM)
    pan_x = clamp_float(pan_x, -1.0, 1.0)
    pan_y = clamp_float(pan_y, -1.0, 1.0)

    if source_bytes:
        source = load_image_from_bytes(source_bytes, mode="RGB")
        bg = cover_crop_positioned(source, width, height, zoom=zoom, pan_x=pan_x, pan_y=pan_y)
    else:
        bg = build_collection_fallback_background(width, height)

    if darkness > 0:
        bg = bg.point(lambda p: int(p * (1.0 - (darkness * 0.42))))

    font, lines, boxes, line_gap = fit_collection_text_block(
        text,
        width=width,
        height=height,
        text_scale=clamp_float(text_scale, 0.65, 1.8),
    )
    try:
        text_fill = ImageColor.getrgb(text_color)
    except ValueError:
        text_fill = (255, 255, 255)
    padding_x = max(34, int(width * 0.06))
    padding_y = max(28, int(height * 0.05))
    line_heights = [(box[3] - box[1]) for box in boxes]
    line_widths = [(box[2] - box[0]) for box in boxes]
    text_block_w = max(line_widths) if line_widths else 0
    text_block_h = sum(line_heights) + line_gap * max(0, len(lines) - 1)

    if text_align == "left":
        text_x = padding_x
    elif text_align == "right":
        text_x = width - padding_x - text_block_w
    else:
        text_x = (width - text_block_w) // 2

    if text_position == "top":
        text_y = padding_y
    elif text_position == "center":
        text_y = max(padding_y, (height - text_block_h) // 2)
    else:
        text_y = height - padding_y - text_block_h

    panel_pad_x = max(22, int(font.size * 0.45))
    panel_pad_y = max(18, int(font.size * 0.34))
    panel_left = max(14, text_x - panel_pad_x)
    panel_top = max(14, text_y - panel_pad_y)
    panel_right = min(width - 14, text_x + text_block_w + panel_pad_x)
    panel_bottom = min(height - 14, text_y + text_block_h + panel_pad_y)

    overlay = Image.new("RGBA", (width, height), (0, 0, 0, 0))
    overlay_draw = ImageDraw.Draw(overlay)
    overlay_draw.rounded_rectangle(
        [(panel_left, panel_top), (panel_right, panel_bottom)],
        radius=max(18, int(min(width, height) * 0.024)),
        fill=(0, 0, 0, 92 + int(darkness * 80)),
        outline=(255, 255, 255, 18),
        width=1,
    )

    bg = Image.alpha_composite(bg.convert("RGBA"), overlay).convert("RGB")
    draw = ImageDraw.Draw(bg)
    stroke_width = max(2, int(font.size * 0.08))
    current_y = text_y
    for line, box, line_height, line_width in zip(lines, boxes, line_heights, line_widths):
        if text_align == "left":
            line_x = padding_x - box[0]
        elif text_align == "right":
            line_x = width - padding_x - line_width - box[0]
        else:
            line_x = ((width - line_width) // 2) - box[0]
        draw.text(
            (line_x, current_y - box[1]),
            line,
            font=font,
            fill=text_fill,
            stroke_width=stroke_width,
            stroke_fill=(0, 0, 0),
        )
        current_y += line_height + line_gap

    buf = io.BytesIO()
    bg.save(buf, format="PNG")
    buf.seek(0)
    return buf.getvalue()


def parse_collection_render_request(body: dict) -> dict:
    try:
        item_id = str(body["item_id"])
    except KeyError as exc:
        raise HTTPException(status_code=400, detail="Missing item id.") from exc

    return {
        "item_id": item_id,
        "target_type": normalize_collection_target_type(body.get("target_type", "Thumb")),
        "text": normalize_collection_text(body.get("text") or body.get("title")),
        "text_color": body.get("text_color", "#FFFFFF"),
        "text_align": normalize_collection_choice(body.get("text_align"), {"left", "center", "right"}, "center"),
        "text_position": normalize_collection_choice(body.get("text_position"), {"top", "center", "bottom"}, "bottom"),
        "text_scale": clamp_float(body.get("text_scale", 1.0), 0.65, 1.8),
        "darkness": clamp_float(body.get("darkness", 0.18), 0.0, 0.85),
        "zoom": clamp_float(body.get("zoom", 1.0), PRIMARY_MIN_ZOOM, PRIMARY_MAX_ZOOM),
        "pan_x": clamp_float(body.get("pan_x", 0.0), -1.0, 1.0),
        "pan_y": clamp_float(body.get("pan_y", 0.0), -1.0, 1.0),
        "upload_bg_id": body.get("upload_bg_id") or None,
    }


async def get_collection_source_bytes(item_id: str, target_type: str, upload_bg_id: str | None) -> bytes | None:
    if upload_bg_id:
        return get_upload_cache_path(upload_bg_id).read_bytes()

    fallback_types = [target_type]
    if target_type == "Thumb":
        fallback_types.append("Primary")
    else:
        fallback_types.append("Thumb")

    seen: set[str] = set()
    for image_type in fallback_types:
        if image_type in seen:
            continue
        seen.add(image_type)
        image_bytes = await emby_get_image_optional(item_id, image_type)
        if image_bytes:
            return image_bytes
    return None


async def render_collection_art_preview(options: dict) -> tuple[str, bytes]:
    cache_key = build_collection_cache_key(
        item_id=options["item_id"],
        target_type=options["target_type"],
        text=options["text"],
        text_color=options["text_color"],
        text_align=options["text_align"],
        text_position=options["text_position"],
        text_scale=options["text_scale"],
        darkness=options["darkness"],
        zoom=options["zoom"],
        pan_x=options["pan_x"],
        pan_y=options["pan_y"],
        upload_bg_id=options["upload_bg_id"],
    )
    cache_path = get_collection_cache_path(cache_key)
    if cache_path.exists():
        return cache_key, cache_path.read_bytes()

    source_bytes = await get_collection_source_bytes(
        options["item_id"],
        options["target_type"],
        options["upload_bg_id"],
    )
    preview_bytes = generate_collection_art(
        source_bytes=source_bytes,
        target_type=options["target_type"],
        text=options["text"],
        text_color=options["text_color"],
        text_align=options["text_align"],
        text_position=options["text_position"],
        text_scale=options["text_scale"],
        darkness=options["darkness"],
        zoom=options["zoom"],
        pan_x=options["pan_x"],
        pan_y=options["pan_y"],
    )
    cache_path.write_bytes(preview_bytes)
    return cache_key, preview_bytes


# --- API Routes ---


@app.get("/api/bulk-assign/series")
async def get_bulk_assign_series(
    q: str = Query(""),
    start: int = Query(0, ge=0),
    limit: int = Query(24, ge=1, le=60),
):
    params = {
        "IncludeItemTypes": "Series",
        "Recursive": "true",
        "SortBy": "SortName",
        "SortOrder": "Ascending",
        "Fields": "ProductionYear",
        "StartIndex": str(start),
        "Limit": str(limit),
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo,Backdrop",
    }
    if q.strip():
        params["SearchTerm"] = q.strip()

    data = await emby_get("/Items", params)
    items: list[dict] = []
    for item in data.get("Items", []):
        image_tags = item.get("ImageTags") or {}
        backdrop_tags = item.get("BackdropImageTags") or []
        entry = {
            "id": item["Id"],
            "name": item.get("Name", ""),
            "year": item.get("ProductionYear"),
            "type": item.get("Type", ""),
            "poster_url": f"/api/poster/{item['Id']}?w=180&h=270&q=84" if "Primary" in image_tags else None,
            "has_primary": "Primary" in image_tags,
            "has_logo": "Logo" in image_tags,
            "has_backdrop": bool(backdrop_tags),
            "backdrop_count": len(backdrop_tags),
        }
        entry["can_bulk_assign"] = can_bulk_assign_series_item(entry)
        items.append(entry)

    total = int(data.get("TotalRecordCount", start + len(items)))
    return {
        "items": items,
        "start": start,
        "limit": limit,
        "total": total,
        "has_more": start + len(items) < total,
        "query": q.strip(),
    }


@app.get("/api/bulk-assign/movies")
async def get_bulk_assign_movies(
    q: str = Query(""),
    start: int = Query(0, ge=0),
    limit: int = Query(24, ge=1, le=60),
):
    params = {
        "IncludeItemTypes": "Movie",
        "Recursive": "true",
        "SortBy": "SortName",
        "SortOrder": "Ascending",
        "Fields": "ProductionYear",
        "StartIndex": str(start),
        "Limit": str(limit),
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo,Backdrop",
    }
    if q.strip():
        params["SearchTerm"] = q.strip()

    data = await emby_get("/Items", params)
    items: list[dict] = []
    for item in data.get("Items", []):
        image_tags = item.get("ImageTags") or {}
        backdrop_tags = item.get("BackdropImageTags") or []
        entry = {
            "id": item["Id"],
            "name": item.get("Name", ""),
            "year": item.get("ProductionYear"),
            "type": item.get("Type", ""),
            "poster_url": f"/api/poster/{item['Id']}?w=180&h=270&q=84" if "Primary" in image_tags else None,
            "has_primary": "Primary" in image_tags,
            "has_logo": "Logo" in image_tags,
            "has_backdrop": bool(backdrop_tags),
            "backdrop_count": len(backdrop_tags),
        }
        entry["can_bulk_assign"] = can_bulk_assign_series_item(entry)
        items.append(entry)

    total = int(data.get("TotalRecordCount", start + len(items)))
    return {
        "items": items,
        "start": start,
        "limit": limit,
        "total": total,
        "has_more": start + len(items) < total,
        "query": q.strip(),
    }


@app.get("/api/airing")
async def get_airing_titles(
    page: int = Query(1, ge=1),
    limit: int = Query(12, ge=1, le=48),
    eligible_only: bool = False,
    refresh: bool = False,
    week_offset: int = Query(0, ge=-8, le=4),
):
    snapshot = await get_airing_snapshot(force_refresh=refresh, week_offset=week_offset)
    items = snapshot["items"]
    filtered = [item for item in items if item["eligible_new_season"]] if eligible_only else items
    start = (page - 1) * limit
    page_items = filtered[start:start + limit]
    total = len(filtered)
    return {
        "items": page_items,
        "page": page,
        "limit": limit,
        "total": total,
        "has_more": start + limit < total,
        "generated_at": snapshot["generated_at"],
        "week_start": snapshot["week_start"],
        "week_end": snapshot["week_end"],
        "week_offset": snapshot["week_offset"],
        "new_season_min_days": snapshot["new_season_min_days"],
        "new_season_max_days": snapshot["new_season_max_days"],
    }


@app.post("/api/airing/apply-new-season")
async def apply_new_season_banner(request: Request):
    body = await request.json()
    item_id = body["item_id"]
    generate_primary = bool(body.get("generate_primary", True))
    week_offset = int(body.get("week_offset", 0))

    snapshot = await get_airing_snapshot(force_refresh=bool(body.get("refresh", False)), week_offset=week_offset)
    item = next((entry for entry in snapshot["items"] if entry["id"] == item_id), None)
    if item is None:
        raise HTTPException(status_code=404, detail="Series was not found in the current airing snapshot.")
    if not can_apply_new_season_snapshot_item(item):
        raise HTTPException(
            status_code=400,
            detail=(
                f"Series is outside the New Season window. "
                f"It must be between {snapshot['new_season_min_days']} and {snapshot['new_season_max_days']} days "
                f"from the season premiere."
            ),
        )
    return await apply_new_season_artwork_for_snapshot_item(
        item,
        title=body.get("title") or item["name"],
        generate_primary=generate_primary,
    )


@app.post("/api/bulk-assign/apply")
@app.post("/api/airing/apply-new-season/bulk")
async def bulk_apply_new_season_banner(request: Request):
    body = await request.json()
    item_ids_raw = body.get("item_ids") or []
    if not isinstance(item_ids_raw, list):
        raise HTTPException(status_code=400, detail="item_ids must be a list.")

    item_ids: list[str] = []
    seen_item_ids: set[str] = set()
    for raw_item_id in item_ids_raw:
        item_id = str(raw_item_id or "").strip()
        if not item_id or item_id in seen_item_ids:
            continue
        seen_item_ids.add(item_id)
        item_ids.append(item_id)
    if not item_ids:
        raise HTTPException(status_code=400, detail="At least one series must be selected.")

    generate_primary = bool(body.get("generate_primary", False))
    if generate_primary:
        raise HTTPException(status_code=400, detail="Bulk assign only applies thumb artwork.")

    items = await emby_get_all("/Items", {
        "Ids": ",".join(item_ids),
        "IncludeItemTypes": "Series,Movie",
        "Recursive": "true",
        "Fields": "ProductionYear",
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo,Backdrop",
    })
    items_by_id = {}
    for entry in items:
        image_tags = entry.get("ImageTags") or {}
        backdrop_tags = entry.get("BackdropImageTags") or []
        item = {
            "id": entry.get("Id"),
            "name": entry.get("Name", ""),
            "has_primary": "Primary" in image_tags,
            "has_logo": "Logo" in image_tags,
            "has_backdrop": bool(backdrop_tags),
        }
        if item["id"]:
            items_by_id[item["id"]] = item

    applied: list[str] = []
    skipped_not_found: list[str] = []
    skipped_missing_assets: list[str] = []
    failed: list[dict] = []

    logger.info("=== Bulk Apply Selected: %d item(s) ===", len(item_ids))
    for i, item_id in enumerate(item_ids):
        item = items_by_id.get(item_id)
        if item is None:
            logger.warning("[%d/%d] ID %s — not found in Emby", i + 1, len(item_ids), item_id)
            skipped_not_found.append(item_id)
            continue
        if not can_bulk_assign_series_item(item):
            logger.info("[%d/%d] %s — skipped (missing logo or backdrop)", i + 1, len(item_ids), item["name"])
            skipped_missing_assets.append(item.get("name") or item_id)
            continue
        logger.info("[%d/%d] %s", i + 1, len(item_ids), item["name"])
        try:
            await apply_bulk_assign_series_thumb(item)
            applied.append(item.get("name") or item_id)
        except Exception as exc:
            err_msg = exc.detail if isinstance(exc, HTTPException) else str(exc)
            logger.error("  FAILED: %s — %s", item["name"], err_msg)
            failed.append({"name": item.get("name") or item_id, "error": err_msg})

    logger.info(
        "=== Bulk Apply Selected complete: %d applied, %d skipped, %d not found, %d failed ===",
        len(applied), len(skipped_missing_assets), len(skipped_not_found), len(failed),
    )
    return {
        "status": "completed",
        "requested_count": len(item_ids),
        "applied_count": len(applied),
        "skipped_missing_assets_count": len(skipped_missing_assets),
        "skipped_not_found_count": len(skipped_not_found),
        "failed_count": len(failed),
        "applied": applied[:12],
        "failed": failed[:12],
    }


@app.post("/api/bulk-assign/apply-all")
async def bulk_apply_all_eligible(request: Request):
    body = await request.json()
    item_type = str(body.get("item_type") or "series").strip().lower()
    if item_type not in ("series", "movie"):
        raise HTTPException(status_code=400, detail="item_type must be 'series' or 'movie'.")
    emby_type = "Series" if item_type == "series" else "Movie"

    logger.info("=== Bulk Apply All: fetching all %s items from Emby ===", emby_type)
    all_entries = await emby_get_all("/Items", {
        "IncludeItemTypes": emby_type,
        "Recursive": "true",
        "Fields": "ProductionYear",
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo,Backdrop",
    })
    logger.info("Fetched %d total %s entries from Emby", len(all_entries), emby_type)

    eligible = []
    skipped_missing = 0
    for entry in all_entries:
        image_tags = entry.get("ImageTags") or {}
        backdrop_tags = entry.get("BackdropImageTags") or []
        item = {
            "id": entry.get("Id"),
            "name": entry.get("Name", ""),
            "has_primary": "Primary" in image_tags,
            "has_logo": "Logo" in image_tags,
            "has_backdrop": bool(backdrop_tags),
            "backdrop_count": len(backdrop_tags),
        }
        if item["id"] and can_bulk_assign_series_item(item):
            eligible.append(item)
        else:
            skipped_missing += 1

    logger.info(
        "%d eligible (logo+backdrop present), %d skipped (missing assets)",
        len(eligible), skipped_missing,
    )

    applied: list[str] = []
    failed: list[dict] = []

    for i, item in enumerate(eligible):
        position = i + 1
        # Every 5th item: try to use a second backdrop for variety
        if position % 5 == 0:
            if item["backdrop_count"] < 2:
                logger.info(
                    "[%d/%d] %s — every-5th variant, only 1 backdrop; requesting more from Emby…",
                    position, len(eligible), item["name"],
                )
                new_count = await emby_refresh_backdrops(item["id"])
                item["backdrop_count"] = new_count
                logger.info(
                    "  Emby returned %d backdrop(s) after refresh", new_count,
                )
            if item["backdrop_count"] >= 2:
                backdrop_index = random.randint(0, 1)
                logger.info(
                    "[%d/%d] %s — every-5th variant, using random backdrop #%d",
                    position, len(eligible), item["name"], backdrop_index,
                )
            else:
                backdrop_index = 0
                logger.info(
                    "[%d/%d] %s — every-5th variant, only 1 backdrop available, using #0",
                    position, len(eligible), item["name"],
                )
        else:
            backdrop_index = 0
            logger.info("[%d/%d] %s", position, len(eligible), item["name"])

        try:
            await apply_bulk_assign_series_thumb(item, backdrop_index=backdrop_index)
            applied.append(item.get("name") or item["id"])
        except Exception as exc:
            err_msg = exc.detail if isinstance(exc, HTTPException) else str(exc)
            logger.error("  FAILED: %s — %s", item["name"], err_msg)
            failed.append({"name": item.get("name") or item["id"], "error": err_msg})

    logger.info(
        "=== Bulk Apply All complete: %d applied, %d failed ===",
        len(applied), len(failed),
    )
    if failed:
        for f in failed:
            logger.warning("  Failed: %s — %s", f["name"], f["error"])

    return {
        "status": "completed",
        "eligible_count": len(eligible),
        "applied_count": len(applied),
        "failed_count": len(failed),
        "applied": applied[:20],
        "failed": failed[:20],
    }


@app.post("/api/bulk-reset/studio")
async def bulk_reset_studio(request: Request):
    body = await request.json()
    studio_key = (body.get("studio_key") or "").strip().lower()
    if studio_key not in STUDIO_EMBY_NAMES:
        raise HTTPException(status_code=400, detail=f"Unknown studio key: {studio_key}")

    studio_ids = await find_studio_ids(studio_key)
    if not studio_ids:
        return {"reset": 0, "skipped": 0, "message": "No matching studio found in Emby."}

    items = await emby_get_all("/Items", {
        "StudioIds": ",".join(studio_ids),
        "IncludeItemTypes": "Series,Movie",
        "Recursive": "true",
        "Fields": "",
        "ImageTypeLimit": "0",
    })

    reset = 0
    skipped = 0
    for entry in items:
        item_id = entry.get("Id")
        if not item_id:
            continue
        try:
            await emby_delete_image(item_id, "Thumb")
            await emby_delete_image(item_id, "Primary")
            # Invalidate local image caches so the next fetch gets the fresh Emby version
            for image_type in ("Primary", "Thumb"):
                cache_path = get_emby_image_cache_path(item_id, image_type)
                cache_path.unlink(missing_ok=True)
            get_emby_image_miss_path(item_id, "Primary").unlink(missing_ok=True)
            (CLEAN_POSTER_CACHE_DIR / f"{item_id}.img").unlink(missing_ok=True)
            # Ask Emby to fill in the now-missing Primary from its image providers (e.g. TMDB).
            # ReplaceAllImages=false is intentional: Emby will only download images that are
            # absent, so once we upload our stamped poster it won't be overwritten by this job.
            resp = await emby_request(
                "POST",
                f"/Items/{item_id}/Refresh",
                params={
                    "MetadataRefreshMode": "None",
                    "ImageRefreshMode": "FullRefresh",
                    "ReplaceAllImages": "false",
                    "ReplaceAllMetadata": "false",
                },
            )
            if resp.status_code not in (200, 204):
                logger.warning("  Emby refresh returned %d for item %s", resp.status_code, item_id)
            reset += 1
        except Exception as exc:
            logger.error("  Reset failed for item %s: %s", item_id, exc)
            skipped += 1

    if reset:
        # Give Emby a head start re-downloading images before the client re-applies.
        await asyncio.sleep(5)

    return {"reset": reset, "skipped": skipped}


@app.post("/api/clean-poster-cache/clear")
async def clear_clean_poster_cache(request: Request):
    """Delete clean poster baselines for given item IDs (or all if none supplied).

    Call this after restoring original posters in Emby so the next bulk assign
    picks up the fresh clean image rather than a previously-stamped one.
    """
    body = await request.json()
    item_ids = body.get("item_ids") or []
    if item_ids:
        cleared = 0
        for item_id in item_ids:
            path = CLEAN_POSTER_CACHE_DIR / f"{str(item_id).strip()}.img"
            if path.exists():
                path.unlink()
                cleared += 1
        return {"cleared": cleared, "scope": "selected"}
    else:
        files = list(CLEAN_POSTER_CACHE_DIR.glob("*.img"))
        for f in files:
            f.unlink(missing_ok=True)
        return {"cleared": len(files), "scope": "all"}


async def find_studio_ids(studio_key: str) -> list[str]:
    """Return Emby studio IDs for a given studio key by searching known display names."""
    ids: list[str] = []
    seen: set[str] = set()
    for name in STUDIO_EMBY_NAMES.get(studio_key, []):
        data = await emby_get("/Studios", {"SearchTerm": name, "Limit": "10"})
        for item in data.get("Items", []):
            sid = item.get("Id")
            sname = (item.get("Name") or "").lower()
            if sid and sid not in seen and (name.lower() in sname or sname in name.lower()):
                ids.append(sid)
                seen.add(sid)
    return ids


@app.get("/api/search")
async def search_items(
    q: str = Query(..., min_length=1),
    type: str = "Movie,Series",
    start: int = Query(0, ge=0),
    limit: int = Query(12, ge=1, le=500),
):
    studio_key = STUDIO_SEARCH_ALIASES.get(q.strip().lower())
    if studio_key:
        studio_ids = await find_studio_ids(studio_key)
        if studio_ids:
            base_params = {
                "StudioIds": ",".join(studio_ids),
                "IncludeItemTypes": type,
                "Recursive": "true",
                "Fields": "ProductionYear,Studios",
                "SortBy": "SortName",
                "SortOrder": "Ascending",
                "ImageTypeLimit": "1",
                "EnableImageTypes": "Primary,Logo,Backdrop",
            }
            if limit >= 100:
                # Bulk fetch — paginate through everything Emby has
                all_items = await emby_get_all("/Items", base_params)
                data = {"Items": all_items, "TotalRecordCount": len(all_items)}
            else:
                data = await emby_get("/Items", {**base_params, "StartIndex": str(start), "Limit": str(limit)})
        else:
            data = {"Items": [], "TotalRecordCount": 0}
    else:
        data = await emby_get("/Items", {
            "SearchTerm": q,
            "IncludeItemTypes": type,
            "Recursive": "true",
            "Fields": "ProductionYear,Studios",
            "StartIndex": str(start),
            "Limit": str(limit),
            "ImageTypeLimit": "1",
            "EnableImageTypes": "Primary,Logo,Backdrop",
        })
    items = []
    for item in data.get("Items", []):
        image_tags = item.get("ImageTags", {})
        backdrop_count = item.get("BackdropImageTags", [])
        items.append({
            "id": item["Id"],
            "name": item.get("Name", ""),
            "year": item.get("ProductionYear", ""),
            "type": item.get("Type", ""),
            "has_logo": "Logo" in image_tags,
            "auto_studio": infer_auto_studio_key(item),
            "backdrop_count": len(backdrop_count),
            "poster_url": f"/api/poster/{item['Id']}?w=72&h=108&q=72",
        })
    total = int(data.get("TotalRecordCount", start + len(items)))
    return {
        "items": items,
        "start": start,
        "limit": limit,
        "total": total,
        "has_more": start + len(items) < total,
        "studio_key": studio_key,
    }


@app.get("/api/categories")
async def get_categories():
    data = await emby_get("/Genres", {
        "Recursive": "true",
        "SortBy": "SortName",
        "SortOrder": "Ascending",
    })
    items = []
    for item in data.get("Items", []):
        items.append({
            "id": item.get("Id"),
            "name": item.get("Name", ""),
            "item_count": item.get("ItemCount") or item.get("ChildCount") or 0,
        })
    items.sort(key=lambda entry: entry["name"].lower())
    return {"items": items}


@app.get("/api/collections")
async def get_collections(
    q: str = Query(""),
    start: int = Query(0, ge=0),
    limit: int = Query(24, ge=1, le=60),
):
    params = {
        "IncludeItemTypes": "BoxSet",
        "Recursive": "true",
        "SortBy": "SortName",
        "SortOrder": "Ascending",
        "Fields": "ChildCount",
        "StartIndex": str(start),
        "Limit": str(limit),
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Thumb",
    }
    if q.strip():
        params["SearchTerm"] = q.strip()

    data = await emby_get("/Items", params)
    items = []
    for item in data.get("Items", []):
        image_tags = item.get("ImageTags") or {}
        items.append({
            "id": item["Id"],
            "name": item.get("Name", ""),
            "type": item.get("Type", ""),
            "child_count": item.get("ChildCount") or 0,
            "poster_url": f"/api/poster/{item['Id']}?w=72&h=108&q=72" if "Primary" in image_tags else None,
        })

    total = int(data.get("TotalRecordCount", start + len(items)))
    return {
        "items": items,
        "start": start,
        "limit": limit,
        "total": total,
        "has_more": start + len(items) < total,
    }


@app.get("/api/collections/{item_id}/artwork")
async def get_collection_artwork(item_id: str):
    images = await emby_get(f"/Items/{item_id}/Images")
    artwork = {
        "Primary": {"exists": False, "url": None},
        "Thumb": {"exists": False, "url": None},
    }
    for image in images:
        image_type = image.get("ImageType")
        if image_type not in artwork or artwork[image_type]["exists"]:
            continue
        artwork[image_type] = {
            "exists": True,
            "url": f"/api/item-image/{item_id}?type={image_type}&w={300 if image_type == 'Primary' else 420}&h={450 if image_type == 'Primary' else 236}&q=88",
        }
    return {
        "primary": artwork["Primary"],
        "thumb": artwork["Thumb"],
    }


@app.get("/api/images/{item_id}")
async def get_image_info(item_id: str):
    """Returns accurate logo and backdrop counts by querying the Images endpoint directly."""
    images = await emby_get(f"/Items/{item_id}/Images")
    logos = []
    backdrops = []
    primaries = []
    for img in images:
        image_type = img.get("ImageType")
        entry = {
            "type": image_type,
            "index": int(img.get("ImageIndex", 0) or 0),
            "width": img.get("Width"),
            "height": img.get("Height"),
        }
        if image_type == "Logo":
            entry["url"] = f"/api/item-image/{item_id}?type=Logo&index={entry['index']}&w=220&h=96&q=90"
            logos.append(entry)
        elif image_type == "Backdrop":
            backdrops.append(entry)
        elif image_type == "Primary":
            entry["url"] = f"/api/item-image/{item_id}?type=Primary&index={entry['index']}&w=120&h=180&q=80"
            primaries.append(entry)
    logos.sort(key=lambda img: img["index"])
    backdrops.sort(key=lambda img: img["index"])
    primaries.sort(key=lambda img: img["index"])
    return {
        "backdrop_count": len(backdrops),
        "has_logo": bool(logos),
        "logo_count": len(logos),
        "primary_count": len(primaries),
        "logos": logos,
        "backdrops": backdrops,
        "primaries": primaries,
    }


@app.get("/api/item-image/{item_id}")
async def get_item_image(
    item_id: str,
    type: str = Query("Primary"),
    index: int | None = Query(None, ge=0),
    w: int = Query(120, ge=24, le=1200),
    h: int = Query(180, ge=24, le=1200),
    q: int = Query(80, ge=30, le=100),
):
    img_bytes, content_type = await emby_get_image_with_type(
        item_id,
        type,
        index=index,
        max_width=w,
        max_height=h,
        quality=q,
    )
    return Response(
        content=img_bytes,
        media_type=content_type,
        headers={"Cache-Control": "public, max-age=86400"},
    )


@app.get("/api/poster/{item_id}")
async def get_poster(
    item_id: str,
    w: int = Query(72, ge=24, le=400),
    h: int = Query(108, ge=24, le=600),
    q: int = Query(72, ge=30, le=100),
):
    img_bytes = await emby_get_image(
        item_id,
        "Primary",
        max_width=w,
        max_height=h,
        quality=q,
    )
    return Response(
        content=img_bytes,
        media_type="image/jpeg",
        headers={"Cache-Control": "public, max-age=86400"},
    )


@app.get("/api/cache/{cache_key}/primary")
async def get_cached_primary_preview(cache_key: str):
    if not cache_key or any(ch not in "0123456789abcdef" for ch in cache_key.lower()):
        raise HTTPException(status_code=400, detail="Invalid cache key.")
    cache_path = get_primary_cache_path(cache_key)
    if not cache_path.exists():
        raise HTTPException(status_code=404, detail="Primary preview not found.")
    return Response(
        content=cache_path.read_bytes(),
        media_type="image/png",
        headers={"Cache-Control": "no-store"},
    )


@app.get("/api/cache/{cache_key}/collection")
async def get_cached_collection_preview(cache_key: str):
    if not cache_key or any(ch not in "0123456789abcdef" for ch in cache_key.lower()):
        raise HTTPException(status_code=400, detail="Invalid cache key.")
    cache_path = get_collection_cache_path(cache_key)
    if not cache_path.exists():
        raise HTTPException(status_code=404, detail="Collection preview not found.")
    return Response(
        content=cache_path.read_bytes(),
        media_type="image/png",
        headers={"Cache-Control": "no-store"},
    )


@app.post("/api/upload-background")
async def upload_background(request: Request):
    form = await request.form()
    file = form.get("file")
    if file is None:
        raise HTTPException(status_code=400, detail="Missing file field.")
    image_bytes = await file.read()
    if len(image_bytes) > UPLOAD_MAX_BYTES:
        raise HTTPException(status_code=400, detail="Uploaded file is too large (max 40 MB).")
    width, height, fmt = validate_image_bytes(image_bytes)
    upload_id = hashlib.sha256(image_bytes).hexdigest()
    upload_path = IMPORT_CACHE_DIR / f"{upload_id}.img"
    if not upload_path.exists():
        upload_path.write_bytes(image_bytes)
    return {"upload_id": upload_id, "width": width, "height": height, "format": fmt}


@app.post("/api/collections/generate")
async def generate_collection_preview(request: Request):
    body = await request.json()
    options = parse_collection_render_request(body)
    cache_key, preview_bytes = await render_collection_art_preview(options)
    return StreamingResponse(
        io.BytesIO(preview_bytes),
        media_type="image/png",
        headers={"X-Cache-Key": cache_key},
    )


@app.post("/api/collections/apply")
async def apply_collection_art(request: Request):
    body = await request.json()
    options = parse_collection_render_request(body)
    _, preview_bytes = await render_collection_art_preview(options)
    status_code = await emby_upload_image(options["item_id"], preview_bytes, options["target_type"])
    return {
        "status": "applied",
        "target_type": options["target_type"],
        "code": status_code,
    }


@app.post("/api/generate")
async def generate(request: Request):
    options = await apply_auto_studio_defaults(parse_generator_request(await request.json()))
    render_options = dict(options)
    render_options["generate_primary"] = False
    cache_key = get_generator_cache_key(options)
    thumb_cache_path = get_thumb_cache_path(cache_key)

    thumb_cached = thumb_cache_path.exists()
    if thumb_cached:
        return StreamingResponse(
            io.BytesIO(thumb_cache_path.read_bytes()),
            media_type="image/png",
            headers={
                "X-Primary-Generated": "0",
                "X-Cache-Key": cache_key,
            },
        )

    thumb_bytes, _ = await render_item_artwork(render_options)
    thumb_cache_path.write_bytes(thumb_bytes)

    return StreamingResponse(
        io.BytesIO(thumb_bytes),
        media_type="image/png",
        headers={
            "X-Primary-Generated": "0",
            "X-Cache-Key": cache_key,
        },
    )


@app.post("/api/apply")
async def apply_to_emby(request: Request):
    options = await apply_auto_studio_defaults(parse_generator_request(await request.json()))
    render_options = dict(options)
    render_options["generate_primary"] = False
    cache_key = get_generator_cache_key(options)
    thumb_cache_path = get_thumb_cache_path(cache_key)

    if not thumb_cache_path.exists():
        thumb_bytes, _ = await render_item_artwork(render_options)
        thumb_cache_path.write_bytes(thumb_bytes)

    thumb_bytes = thumb_cache_path.read_bytes()
    thumb_status = await emby_upload_image(options["item_id"], thumb_bytes, "Thumb")

    primary_status = None
    primary_error = None
    if options["generate_primary"]:
        try:
            studio = (options.get("studio") or "none").strip().lower()
            if studio == "none":
                primary_error = "Primary poster stamping requires a studio logo selection."
            else:
                primary_status = await stamp_studio_logo_on_poster(
                    options["item_id"],
                    studio,
                    options.get("studio_position", "top-left"),
                )
        except Exception as exc:
            primary_error = str(exc)

    return {
        "status": "applied",
        "thumb_code": thumb_status,
        "primary_code": primary_status,
        "primary_attempted": options["generate_primary"],
        "primary_error": primary_error,
    }


@app.post("/api/bulk-apply/category")
async def bulk_apply_category(request: Request):
    body = await request.json()
    category_id = (body.get("category_id") or "").strip()
    category_name = (body.get("category_name") or "").strip()
    if not category_id:
        raise HTTPException(status_code=400, detail="Category is required.")

    base_options = await apply_auto_studio_defaults(parse_generator_request(body))
    items = await emby_get_all("/Items", {
        "GenreIds": category_id,
        "IncludeItemTypes": "Movie,Series",
        "Recursive": "true",
        "SortBy": "SortName",
        "SortOrder": "Ascending",
        "Fields": "ProductionYear",
        "ImageTypeLimit": "1",
        "EnableImageTypes": "Primary,Logo,Backdrop",
    })
    eligible_items: list[dict] = []
    skipped_without_logo: list[str] = []
    skipped_without_primary: list[str] = []
    for item in items:
        image_tags = item.get("ImageTags") or {}
        name = item.get("Name") or "Unknown"
        if "Primary" not in image_tags:
            skipped_without_primary.append(name)
            continue
        if "Logo" not in image_tags:
            skipped_without_logo.append(name)
            continue
        eligible_items.append(item)

    applied: list[str] = []
    failed: list[dict] = []
    for item in eligible_items:
        item_options = dict(base_options)
        item_options["item_id"] = item["Id"]
        item_options["title"] = item.get("Name", "")
        if item.get("Type") != "Series":
            item_options["new_episodes_tag"] = False
            item_options["season_finale_tag"] = False
        item_options = await apply_auto_studio_defaults(item_options)
        cache_key = get_generator_cache_key(item_options)
        thumb_cache_path = get_thumb_cache_path(cache_key)
        primary_cache_path = get_primary_cache_path(cache_key)
        try:
            thumb_bytes, primary_bytes = await render_item_artwork(item_options, fallback_logo_to_first=True)
            thumb_cache_path.write_bytes(thumb_bytes)
            await emby_upload_image(item["Id"], thumb_bytes, "Thumb")
            if item_options["generate_primary"] and primary_bytes is not None:
                primary_cache_path.write_bytes(primary_bytes)
                await emby_upload_image(item["Id"], primary_bytes, "Primary")
            applied.append(item.get("Name", ""))
        except Exception as exc:
            failed.append({
                "name": item.get("Name", ""),
                "error": str(exc),
            })
    return {
        "status": "completed",
        "category_id": category_id,
        "category_name": category_name,
        "matched_count": len(items),
        "eligible_count": len(eligible_items),
        "applied_count": len(applied),
        "skipped_without_logo_count": len(skipped_without_logo),
        "skipped_without_primary_count": len(skipped_without_primary),
        "failed_count": len(failed),
        "failed": failed[:12],
        "applied": applied[:12],
    }


@app.get("/api/config")
async def get_config():
    return {
        "app_name": "HomelabToolkit",
        "emby": {
            "url": EMBY_URL,
            "connected": bool(EMBY_API_KEY),
        },
        "navidrome": {
            "url": navidrome_service.NAVIDROME_URL,
            "configured": navidrome_service.is_configured(),
        },
        "music": {
            "root": str(music_service.MUSIC_ROOT),
            "available": music_service.MUSIC_ROOT.exists(),
        },
    }


# ── Dashboard overview ───────────────────────────────────────────────────────


@app.get("/api/dashboard")
async def get_dashboard():
    """Aggregate library counts for the homepage. Resilient: any failing source
    degrades to null/0 rather than failing the whole response."""
    client = get_http_client()

    async def emby_count(item_types: str) -> int:
        data = await emby_get("/Items", {
            "IncludeItemTypes": item_types,
            "Recursive": "true",
            "Limit": "1",
            "ImageTypeLimit": "0",
        })
        return int(data.get("TotalRecordCount", 0))

    async def latest_added() -> str | None:
        data = await emby_get("/Items", {
            "IncludeItemTypes": "Movie,Episode",
            "Recursive": "true",
            "SortBy": "DateCreated",
            "SortOrder": "Descending",
            "Limit": "1",
            "Fields": "DateCreated",
        })
        items = data.get("Items") or []
        return items[0].get("DateCreated") if items else None

    async def user_count() -> int:
        data = await emby_get("/Users")
        return len(data) if isinstance(data, list) else 0

    async def favorites_count() -> int:
        return len(await favorites_service.list_favorites_users(emby_client_adapter))

    async def navidrome_stats() -> dict:
        status = await navidrome_service.ping(client)
        if not status.get("connected"):
            return {"connected": False, "configured": status.get("configured", False)}
        stats = await navidrome_service.get_stats(client)
        return {"connected": True, "configured": True, **stats}

    (
        movies, series, episodes, collections, users, favorites, last_added, navidrome,
    ) = await asyncio.gather(
        emby_count("Movie"),
        emby_count("Series"),
        emby_count("Episode"),
        emby_count("BoxSet"),
        user_count(),
        favorites_count(),
        latest_added(),
        navidrome_stats(),
        return_exceptions=True,
    )

    def safe(value, default=0):
        return default if isinstance(value, Exception) else value

    return {
        "emby": {
            "connected": bool(EMBY_API_KEY),
            "url": EMBY_URL,
            "movies": safe(movies),
            "series": safe(series),
            "episodes": safe(episodes),
            "collections": safe(collections),
            "users": safe(users),
            "favorites_collections": safe(favorites),
            "last_added": safe(last_added, None),
        },
        "navidrome": navidrome if not isinstance(navidrome, Exception) else {"connected": False},
        "music": {
            "available": music_service.MUSIC_ROOT.exists(),
            "root": str(music_service.MUSIC_ROOT),
        },
    }


@app.post("/api/emby/refresh-libraries")
async def emby_refresh_libraries():
    """Trigger a scan of all Emby libraries."""
    response = await emby_request(
        "POST", "/Library/Refresh", headers={"X-Emby-Token": EMBY_API_KEY}
    )
    if response.status_code not in (200, 204):
        raise HTTPException(
            status_code=502,
            detail=f"Emby library refresh failed ({response.status_code}).",
        )
    return {"status": "started"}


@app.post("/api/navidrome/scan")
async def navidrome_scan(full: bool = Query(False)):
    """Trigger a Navidrome library scan."""
    try:
        result = await navidrome_service.start_scan(get_http_client(), full=full)
    except NavidromeError as exc:
        raise _handle_navidrome_error(exc) from exc
    return {"status": "started", **result}


@app.get("/api/emby/user-activity")
async def emby_user_activity():
    """Per-user last login + last activity, enriched with the most recent
    session's IP/device. ``/Users`` carries login timestamps; ``/Sessions``
    carries the remote endpoint (IP)."""
    users, sessions = await asyncio.gather(
        emby_get("/Users"),
        emby_get("/Sessions"),
        return_exceptions=True,
    )
    if isinstance(users, Exception):
        raise HTTPException(status_code=502, detail="Could not load Emby users.")
    if isinstance(sessions, Exception) or not isinstance(sessions, list):
        sessions = []

    def clean_ip(value: str | None) -> str | None:
        if not value:
            return None
        value = value.strip()
        if value.startswith("::ffff:"):
            value = value[len("::ffff:"):]
        return value or None

    def platform_of(client: str | None, device: str | None) -> str:
        text = f"{client or ''} {device or ''}".lower()
        if "android" in text:
            return "android"
        if any(k in text for k in ("ios", "iphone", "ipad", "apple tv", "tvos")):
            return "ios"
        if any(k in text for k in ("web", "browser", "chrome", "firefox", "safari", "edge")):
            return "web"
        return "other"

    latest_session: dict[str, dict] = {}
    devices: dict[str, str] = {}  # device id -> platform
    for session in sessions:
        client = session.get("Client")
        device = session.get("DeviceName")
        device_id = session.get("DeviceId") or f"{device}::{client}"
        if device_id:
            devices[device_id] = platform_of(client, device)
        user_id = session.get("UserId")
        if not user_id:
            continue
        last = session.get("LastActivityDate") or ""
        existing = latest_session.get(user_id)
        if existing is None or last > existing["last"]:
            latest_session[user_id] = {
                "last": last,
                "ip": clean_ip(session.get("RemoteEndPoint")),
                "device": device,
                "client": client,
            }

    rows = []
    for user in users if isinstance(users, list) else []:
        user_id = user.get("Id")
        session = latest_session.get(user_id, {})
        rows.append({
            "id": user_id,
            "name": user.get("Name", ""),
            "last_login": user.get("LastLoginDate"),
            "last_activity": user.get("LastActivityDate"),
            "ip": session.get("ip"),
            "device": session.get("device"),
            "client": session.get("client"),
        })

    rows.sort(key=lambda r: (r["last_activity"] or r["last_login"] or ""), reverse=True)

    platform_counts = {"android": 0, "ios": 0, "web": 0, "other": 0}
    for platform in devices.values():
        platform_counts[platform] += 1
    device_count = len(devices)

    def pct(value: int) -> int:
        return round(value / device_count * 100) if device_count else 0

    summary = {
        "user_count": len(rows),
        "device_count": device_count,
        "platforms": platform_counts,
        "platform_pct": {key: pct(value) for key, value in platform_counts.items()},
    }
    return {"users": rows, "summary": summary}


# ── Settings ─────────────────────────────────────────────────────────────────


@app.get("/api/settings")
async def get_settings():
    return settings_service.load()


@app.post("/api/settings")
async def update_settings(request: Request):
    try:
        body = await request.json()
    except Exception:
        body = {}
    if not isinstance(body, dict):
        raise HTTPException(status_code=400, detail="Settings payload must be an object.")
    values = settings_service.save(body)
    apply_settings(values)
    navidrome_status = await navidrome_service.ping(get_http_client())
    return {
        "settings": values,
        "navidrome": navidrome_status,
        "music_available": music_service.MUSIC_ROOT.exists(),
    }


# ── Navidrome (Subsonic API) ─────────────────────────────────────────────────


def _handle_navidrome_error(exc: NavidromeError) -> HTTPException:
    return HTTPException(status_code=exc.status, detail=exc.message)


@app.get("/api/navidrome/status")
async def navidrome_status():
    return await navidrome_service.ping(get_http_client())


@app.get("/api/navidrome/artists")
async def navidrome_artists():
    try:
        return {"items": await navidrome_service.get_artists(get_http_client())}
    except NavidromeError as exc:
        raise _handle_navidrome_error(exc) from exc


@app.get("/api/navidrome/albums")
async def navidrome_albums(
    q: str = Query(""),
    type: str = Query("alphabeticalByName"),
    size: int = Query(100, ge=1, le=500),
    offset: int = Query(0, ge=0),
):
    client = get_http_client()
    try:
        if q.strip():
            items = await navidrome_service.search_albums(client, q.strip(), count=size)
        else:
            items = await navidrome_service.get_albums(client, list_type=type, size=size, offset=offset)
        return {"items": items, "offset": offset, "size": size, "has_more": len(items) >= size}
    except NavidromeError as exc:
        raise _handle_navidrome_error(exc) from exc


_navidrome_formats_cache: dict = {"data": None, "expires": 0.0}
NAVIDROME_FORMATS_TTL = 1800


@app.get("/api/navidrome/formats")
async def navidrome_formats(refresh: bool = Query(False)):
    now = time.time()
    cached = _navidrome_formats_cache
    if not refresh and cached["data"] is not None and cached["expires"] > now:
        return cached["data"]
    try:
        data = await navidrome_service.get_format_breakdown(get_http_client())
    except NavidromeError as exc:
        raise _handle_navidrome_error(exc) from exc
    _navidrome_formats_cache.update(data=data, expires=now + NAVIDROME_FORMATS_TTL)
    return data


@app.get("/api/navidrome/album/{album_id}")
async def navidrome_album(album_id: str):
    try:
        return await navidrome_service.get_album(get_http_client(), album_id)
    except NavidromeError as exc:
        raise _handle_navidrome_error(exc) from exc


@app.get("/api/navidrome/cover/{cover_id}")
async def navidrome_cover(cover_id: str, size: int = Query(0, ge=0, le=1500)):
    try:
        image_bytes, content_type = await navidrome_service.get_cover_art(
            get_http_client(), cover_id, size or None
        )
    except NavidromeError as exc:
        raise _handle_navidrome_error(exc) from exc
    return Response(content=image_bytes, media_type=content_type, headers={"Cache-Control": "public, max-age=86400"})


# ── Music library maintenance (music-covers) ─────────────────────────────────


@app.get("/api/music/scan")
async def music_scan():
    return await asyncio.to_thread(music_service.scan_library)


# ── Music Collection Completeness ────────────────────────────────────────────


@app.post("/api/music-collection/scan")
async def music_collection_scan():
    return library_service.start_scan_job()


@app.post("/api/music-collection/refresh-metadata")
async def music_collection_refresh_metadata():
    return library_service.start_metadata_job()


@app.get("/api/music-collection/status")
async def music_collection_status():
    return await asyncio.to_thread(library_service.get_status)


@app.get("/api/music-collection/overview")
async def music_collection_overview():
    return await asyncio.to_thread(library_service.get_overview)


@app.get("/api/music-collection/artists")
async def music_collection_artists(q: str = Query("")):
    return {"artists": await asyncio.to_thread(library_service.get_artists_completeness, q)}


@app.get("/api/music-collection/artist/{artist_id}/albums")
async def music_collection_artist_albums(artist_id: int):
    return await asyncio.to_thread(library_service.get_artist_albums, artist_id)


@app.post("/api/music-collection/album/{completeness_id}/decision")
async def music_collection_decision(completeness_id: int, request: Request):
    try:
        body = await request.json()
    except Exception:
        body = {}
    action = (body or {}).get("action", "")
    try:
        return await asyncio.to_thread(library_service.set_album_decision, completeness_id, action)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    except LookupError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc


@app.post("/api/music/process")
async def music_process(request: Request):
    try:
        body = await request.json()
    except Exception:
        body = {}
    options = ProcessOptions.from_dict(body if isinstance(body, dict) else {})
    album_paths = body.get("album_paths") if isinstance(body, dict) else None
    result = await asyncio.to_thread(
        music_service.process_library, options, album_paths=album_paths
    )
    return result


# ── User Favourites ──────────────────────────────────────────────────────────

class EmbyClientAdapter:
    """Adapts the module-level Emby helpers to the services' client protocol.

    Write operations carry the ``X-Emby-Token`` header (as the image write paths
    do) and surface Emby errors as HTTPExceptions via ``ensure_emby_success``.
    """

    async def get(self, path: str, params: dict | None = None):
        return await emby_get(path, params)

    async def get_all(self, path: str, params: dict | None = None):
        return await emby_get_all(path, params)

    async def post(self, path: str, params: dict | None = None, **kwargs):
        resp = await emby_request("POST", path, params=params, headers={"X-Emby-Token": EMBY_API_KEY}, **kwargs)
        return ensure_emby_success(resp, context=f"Emby POST {path}")

    async def delete(self, path: str, params: dict | None = None, **kwargs):
        resp = await emby_request("DELETE", path, params=params, headers={"X-Emby-Token": EMBY_API_KEY}, **kwargs)
        return ensure_emby_success(resp, context=f"Emby DELETE {path}")


emby_client_adapter = EmbyClientAdapter()


async def _favorites_body(request: Request) -> dict:
    try:
        body = await request.json()
    except Exception:
        return {}
    return body if isinstance(body, dict) else {}


@app.get("/api/favorites/users")
async def favorites_users():
    return {"users": await favorites_service.list_favorites_users(emby_client_adapter)}


@app.get("/api/favorites/collections")
async def favorites_collections_overview():
    return await favorites_service.list_collections_overview(emby_client_adapter)


@app.get("/api/favorites/collection/{collection_id}")
async def favorites_collection_items(collection_id: str, user_id: str = Query(...)):
    try:
        return await favorites_service.get_collection_items_view(emby_client_adapter, collection_id, user_id)
    except FavoritesError as exc:
        raise HTTPException(status_code=exc.status, detail=exc.message) from exc


@app.post("/api/favorites/collection/{collection_id}/cleanup")
async def favorites_cleanup(collection_id: str, request: Request):
    body = await _favorites_body(request)
    user_id = body.get("userId", "")
    dry_run = bool(body.get("dryRun", True))  # dry-run is the default
    try:
        return await favorites_service.cleanup_watched(
            emby_client_adapter, collection_id, user_id, dry_run=dry_run
        )
    except FavoritesError as exc:
        raise HTTPException(status_code=exc.status, detail=exc.message) from exc


@app.post("/api/favorites/collection/{collection_id}/regenerate")
async def favorites_regenerate(collection_id: str, request: Request):
    body = await _favorites_body(request)
    user_id = body.get("userId", "")
    dry_run = bool(body.get("dryRun", True))  # dry-run is the default
    try:
        target_size = int(body.get("targetSize", DEFAULT_TARGET_SIZE))
    except (TypeError, ValueError) as exc:
        raise HTTPException(status_code=400, detail="targetSize must be an integer.") from exc
    try:
        return await favorites_service.regenerate(
            emby_client_adapter, collection_id, user_id, dry_run=dry_run, target_size=target_size
        )
    except FavoritesError as exc:
        raise HTTPException(status_code=exc.status, detail=exc.message) from exc


# ── React SPA (must stay last so /api routes win) ────────────────────────────


@app.get("/", response_class=HTMLResponse)
@app.get("/{full_path:path}", response_class=HTMLResponse)
async def serve_spa(full_path: str = ""):
    """Serve the built React app, falling back to index.html for client routes."""
    if full_path.startswith("api/"):
        raise HTTPException(status_code=404, detail="Not found")

    index_file = FRONTEND_DIST / "index.html"
    if not index_file.exists():
        return HTMLResponse(
            "<h1>HomelabToolkit</h1><p>Frontend not built. Run "
            "<code>npm install &amp;&amp; npm run build</code> in <code>frontend/</code>.</p>",
            status_code=200,
        )

    # Serve real files (favicon, etc.) directly when they exist.
    if full_path:
        candidate = FRONTEND_DIST / full_path
        if candidate.is_file():
            return FileResponse(candidate)

    return FileResponse(index_file)


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8500)