"""
Audit router.

Admin:
  GET /admin/audit    — paginated, filtered audit log (admin-authenticated)

Member:
  POST /members/audit/page-visit  — record a page navigation (member-authenticated)
"""
import math
import uuid
from datetime import datetime
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query, Request, Response
from sqlalchemy import func, or_, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth.deps import get_current_user
from app.auth.member_deps import get_authenticated_member
from app.database import get_db
from app.middleware.rate_limit import limiter
from app.models.audit import AuditLog
from app.models.member import Member
from app.models.user import User
from app.schemas.audit import AuditLogPage, AuditLogResponse, PageVisitSchema
from app.services.audit import log_audit
from app.services.settings import get_feature_settings_snapshot

router = APIRouter(tags=["Audit"])


async def _require_audit_history_enabled(db: AsyncSession) -> None:
    feature_settings = await get_feature_settings_snapshot(db)
    if not feature_settings.audit_history_enabled:
        raise HTTPException(status_code=404, detail="Audit history is currently disabled.")


# ── Admin: query audit log ─────────────────────────────────────────────────────

@router.get("/admin/audit", response_model=AuditLogPage)
async def admin_list_audit(
    page: int = Query(1, ge=1),
    page_size: int = Query(50, ge=1, le=200),
    member_id: Optional[uuid.UUID] = Query(None),
    action_type: Optional[str] = Query(None),
    status: Optional[str] = Query(None),
    area: Optional[str] = Query(None),
    date_from: Optional[datetime] = Query(None),
    date_to: Optional[datetime] = Query(None),
    search: Optional[str] = Query(None),
    sort_by: str = Query("timestamp"),
    sort_dir: str = Query("desc"),
    _admin: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    await _require_audit_history_enabled(db)

    allowed_sort = {"timestamp", "action_type", "status", "area", "member_email"}
    if sort_by not in allowed_sort:
        sort_by = "timestamp"

    col = getattr(AuditLog, sort_by)
    order = col.desc() if sort_dir == "desc" else col.asc()

    conditions = []
    if member_id is not None:
        conditions.append(AuditLog.member_id == member_id)
    if action_type:
        conditions.append(AuditLog.action_type == action_type)
    if status:
        conditions.append(AuditLog.status == status)
    if area:
        conditions.append(AuditLog.area.ilike(f"%{area}%"))
    if date_from:
        conditions.append(AuditLog.timestamp >= date_from)
    if date_to:
        conditions.append(AuditLog.timestamp <= date_to)
    if search:
        term = f"%{search}%"
        conditions.append(
            or_(
                AuditLog.member_email.ilike(term),
                AuditLog.description.ilike(term),
                AuditLog.area.ilike(term),
                AuditLog.action_type.ilike(term),
                AuditLog.error_message.ilike(term),
            )
        )

    base_q = select(AuditLog)
    if conditions:
        from sqlalchemy import and_
        base_q = base_q.where(and_(*conditions))

    count_result = await db.execute(select(func.count()).select_from(base_q.subquery()))
    total = count_result.scalar_one()

    offset = (page - 1) * page_size
    items_result = await db.execute(base_q.order_by(order).offset(offset).limit(page_size))
    items = items_result.scalars().all()

    return AuditLogPage(
        items=[AuditLogResponse.model_validate(i) for i in items],
        total=total,
        page=page,
        page_size=page_size,
        total_pages=max(1, math.ceil(total / page_size)),
    )


# ── Member: page visit ─────────────────────────────────────────────────────────

@router.post("/members/audit/page-visit", status_code=204)
@limiter.limit("120/minute")
async def member_log_page_visit(
    request: Request,
    response: Response,
    data: PageVisitSchema,
    member: Member = Depends(get_authenticated_member),
    db: AsyncSession = Depends(get_db),
):
    feature_settings = await get_feature_settings_snapshot(db)
    if not feature_settings.audit_history_enabled:
        return

    path = data.path[:255] if data.path else "unknown"
    title = data.title or path

    await log_audit(
        db,
        member_id=member.id,
        member_email=member.email,
        action_type="page_visit",
        area=path,
        description=f"Visited: {title}",
        status="success",
        ip_address=request.client.host if request.client else None,
        user_agent=request.headers.get("User-Agent"),
    )