"""
Request logging middleware.

Prints a clean, colour-coded line for every meaningful HTTP request.
Context-aware: pulls the email, member status, service type, etc. from the
request body for the most important endpoints so you can read the log without
needing to replay the request.

Format
------
  METHOD  /path/to/endpoint                            STATUS  timing  origin
          ↳ human-readable context (when relevant)

Localhost / loopback addresses are rendered as  local:PORT  rather than the
raw IP.
"""

from __future__ import annotations

import io
import json
import sys
import time
from typing import Optional

from rich.console import Console
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.requests import Request

# Force UTF-8 on Windows so arrow / symbol characters render correctly in any
# terminal (Windows Terminal, VS Code, PowerShell).  On other platforms the
# default encoding is already UTF-8.
def _make_console() -> Console:
    if sys.platform == "win32" and hasattr(sys.stdout, "buffer"):
        out = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8", line_buffering=True)
        return Console(highlight=False, markup=True, file=out)
    return Console(highlight=False, markup=True)

_console = _make_console()

# ── Paths that are too noisy to log ───────────────────────────────────────────

_SKIP = frozenset({"/health", "/favicon.ico", "/robots.txt"})
_BODY_METHODS = frozenset({"POST", "PUT", "PATCH"})

# ── Colour maps ───────────────────────────────────────────────────────────────

_METHOD_STYLE: dict[str, str] = {
    "GET":     "bold #6ea8fe",   # soft blue
    "POST":    "bold #75b798",   # soft green
    "PUT":     "bold #e6a817",   # amber
    "PATCH":   "bold #c586c0",   # lavender
    "DELETE":  "bold #f28b82",   # soft red
    "HEAD":    "dim",
    "OPTIONS": "dim",
}


def _status_style(code: int) -> str:
    if code < 300:
        return "bold green"
    if code < 400:
        return "bold cyan"
    if code < 500:
        return "bold yellow"
    return "bold red"


def _timing_style(ms: float) -> str:
    if ms < 200:
        return "white"
    if ms < 1_000:
        return "yellow"
    return "bold red"


# ── Helpers ───────────────────────────────────────────────────────────────────

_LOCAL_HOSTS = {"127.0.0.1", "::1", "0.0.0.0", "localhost", "::ffff:127.0.0.1"}


def _origin(request: Request) -> str:
    host = request.client.host if request.client else "unknown"
    port = request.url.port or 8000
    if host in _LOCAL_HOSTS:
        return f"[dim]local:{port}[/dim]"
    return f"[dim]{host}[/dim]"


def _body(raw: bytes) -> Optional[dict]:
    if not raw:
        return None
    try:
        obj = json.loads(raw)
        return obj if isinstance(obj, dict) else None
    except (json.JSONDecodeError, ValueError):
        return None


def _shorten(path: str, width: int = 58) -> str:
    """Left-pad the path to *width* chars, truncating with ellipsis if needed."""
    if len(path) > width:
        path = path[: width - 1] + "…"
    return f"{path:<{width}}"


# ── Context extraction ────────────────────────────────────────────────────────
# Each branch returns a *markup* string (may contain [colour] tags) or None.

def _context(path: str, method: str, data: Optional[dict], status: int) -> Optional[str]:  # noqa: C901
    d = data or {}
    em = d.get("email", "")

    # ── Admin auth ────────────────────────────────────────────────────────────
    if path.endswith("/auth/login") and "/members/" not in path:
        if status < 400:
            return f"[dim]admin[/dim] · {em}"
        return f"[red]✗[/red] bad credentials · {em}"

    # ── Member auth ───────────────────────────────────────────────────────────
    if "/members/auth/login/verify" in path:
        if status < 400:
            return f"[dim]member 2FA[/dim] · {em} · [green]verified ✓[/green]"
        return f"[red]✗[/red] bad 2FA code · {em}"

    if "/members/auth/login" in path and path.endswith("/login"):
        if status < 400:
            return f"[dim]member login[/dim] · {em}"
        return f"[red]✗[/red] bad password · {em}"

    if "/members/auth/refresh" in path:
        return None   # token rotation — no useful body detail

    # ── Claim flow ────────────────────────────────────────────────────────────
    if "/members/claim/request" in path:
        return f"[dim]claim request[/dim] · {em}"

    if "/members/claim/complete" in path:
        if status < 400:
            return f"[green]account claimed[/green] · {em}"
        return f"[red]✗[/red] claim failed · {em}"

    # ── Member: profile ───────────────────────────────────────────────────────
    if method == "PUT" and path.endswith("/members/me"):
        fields = [k for k in d]
        if fields:
            return "[dim]updated[/dim] · " + ", ".join(fields)
        return None

    # ── Member: onboarding ────────────────────────────────────────────────────
    if "/members/onboarding/contract" in path:
        signer = d.get("signer_name", "")
        if status < 400:
            return f"[green]contract signed[/green] · {signer}"
        return None

    if method == "PUT" and "/members/onboarding" in path:
        if d.get("complete_onboarding"):
            return "[dim]onboarding complete[/dim] → [yellow]pending_contract[/yellow]"
        return None

    # ── Member: bookings ──────────────────────────────────────────────────────
    if method == "POST" and path.endswith("/members/bookings"):
        svc = d.get("service_type", "")
        notes = d.get("notes", "")
        label = _service_label(svc)
        parts = [label] + ([notes[:50]] if notes else [])
        return "[dim]booking request[/dim] · " + " · ".join(p for p in parts if p)

    # ── Admin: create member ──────────────────────────────────────────────────
    if (
        method == "POST"
        and "/admin/members" in path
        and not any(seg in path for seg in ("/activate", "/walks", "/bookings", "/messages"))
    ):
        first = d.get("first_name", "")
        last  = d.get("last_name", "")
        em2   = d.get("email", "")
        name  = f"{first} {last}".strip()
        parts = [n for n in (name, em2) if n]
        return "[dim]new member[/dim] · " + " · ".join(parts)

    if method == "POST" and "/admin/members/" in path and path.endswith("/activate"):
        return "status → [green]active ✓[/green]"

    if method == "PUT" and "/admin/members/" in path:
        s = d.get("member_status")
        if s:
            return f"status → [cyan]{s}[/cyan]"
        return None

    # ── Admin: walks ──────────────────────────────────────────────────────────
    if method == "POST" and "/admin/walks" in path:
        svc = _service_label(d.get("service_type", ""))
        dur = d.get("duration_minutes", "")
        parts = [svc] + ([f"{dur} min"] if dur else [])
        return "[dim]walk recorded[/dim] · " + " · ".join(p for p in parts if p)

    # ── Admin: messages ───────────────────────────────────────────────────────
    if method == "POST" and "/admin/messages" in path:
        subject = d.get("subject", "")
        return f"[dim]message sent[/dim] · {subject}" if subject else "[dim]message sent[/dim]"

    # ── Admin: bookings ───────────────────────────────────────────────────────
    if method == "PUT" and "/admin/bookings/" in path:
        s = d.get("status")
        if s:
            _colour = {"confirmed": "green", "cancelled": "red", "completed": "cyan"}.get(s, "yellow")
            return f"status → [{_colour}]{s}[/{_colour}]"
        if d.get("admin_notes"):
            return "[dim]admin notes updated[/dim]"
        return None

    # ── Admin: notifications ──────────────────────────────────────────────────
    if method == "POST" and "/admin/notifications/run" in path:
        return "[dim]notification run triggered[/dim]"

    if method == "PUT" and "/admin/notifications/settings" in path:
        keys = list(d.keys())
        return "[dim]settings updated[/dim] · " + ", ".join(keys) if keys else None

    # ── Contact leads ─────────────────────────────────────────────────────────
    if "/contact" in path and method == "POST":
        name = d.get("full_name") or d.get("name", "")
        pet  = d.get("pet_name", "")
        email_fallback = d.get("email", "")
        parts = [name or email_fallback] + ([f"dog: {pet}"] if pet else [])
        return "[dim]lead[/dim] · " + " · ".join(p for p in parts if p)

    # ── Generic 4xx hints ─────────────────────────────────────────────────────
    if status == 401:
        return "[red]✗[/red] unauthorized"
    if status == 403:
        return "[red]✗[/red] forbidden"
    if status == 422:
        return "[yellow]⚠[/yellow] validation error"
    if status == 429:
        return "[yellow]⚠[/yellow] rate limited"

    return None


def _service_label(svc: str) -> str:
    return {"pack_walk": "Pack Walk", "1_1_walk": "1-1 Walk", "puppy_visit": "Puppy Visit"}.get(svc, svc)


# ── Middleware ────────────────────────────────────────────────────────────────

class RequestLogMiddleware(BaseHTTPMiddleware):
    """
    Logs every non-trivial HTTP request to the console via Rich.

    Body reads are cached by Starlette's Request.body() so downstream
    handlers always see the full body unchanged.
    """

    async def dispatch(self, request: Request, call_next):
        path   = request.url.path
        method = request.method

        if path in _SKIP or method == "OPTIONS":
            return await call_next(request)

        # Read and cache body before handing to the route handler.
        raw = b""
        if method in _BODY_METHODS:
            raw = await request.body()  # Starlette caches in request._body

        data = _body(raw)

        t0       = time.perf_counter()
        response = await call_next(request)
        elapsed  = (time.perf_counter() - t0) * 1_000

        status  = response.status_code
        ctx     = _context(path, method, data, status)
        origin  = _origin(request)

        method_w = f"{method:<7}"
        timing   = f"{elapsed:>7.1f}ms"
        path_w   = _shorten(path)

        method_styled  = f"[{_METHOD_STYLE.get(method, 'white')}]{method_w}[/]"
        status_styled  = f"[{_status_style(status)}]{status}[/]"
        timing_styled  = f"[{_timing_style(elapsed)}]{timing}[/]"

        _console.print(
            f"  {method_styled}  {path_w}  {status_styled}  {timing_styled}  {origin}"
        )
        if ctx:
            _console.print(f"          [dim]↳[/dim]  {ctx}")

        return response