import asyncio
import logging
from fastapi import APIRouter, Depends, HTTPException, BackgroundTasks
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from ..dependencies import get_db, get_current_user, require_admin
from ..models.user import User
from ..models.media_item import LibraryItem
from ..services.matcher import match_audiobook, search_for_item, _apply_match, _enrich_match
from ..services.matching.musicbrainz import get_release_details
from ..services.matching.open_library import get_work_details
from ..services.matching.base import MatchResult
from datetime import datetime

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/items", tags=["matching"])


@router.post("/{item_id}/match")
async def trigger_match(
    item_id: str,
    background_tasks: BackgroundTasks,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(LibraryItem).where(LibraryItem.id == item_id))
    item = result.scalar_one_or_none()
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")

    background_tasks.add_task(match_audiobook, item_id)
    return {"message": "Matching gestartet", "itemId": item_id}


@router.get("/{item_id}/match/search")
async def search_match(
    item_id: str,
    q: str | None = None,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(LibraryItem).where(LibraryItem.id == item_id))
    item = result.scalar_one_or_none()
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")

    query = q or item.title or ""
    author = item.author if not q else None

    results = await search_for_item(query, author)
    return {"results": results}


@router.post("/{item_id}/match/apply")
async def apply_match(
    item_id: str,
    body: dict,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """
    Wendet einen manuell gewählten Match-Treffer an.
    body: { source, id, title, author, narrator, description, publisher, publishYear, series, seriesSequence, language, genres, cover, ... }
    """
    result = await db.execute(select(LibraryItem).where(LibraryItem.id == item_id))
    item = result.scalar_one_or_none()
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")

    source = body.get("source", "manual")
    source_id = body.get("id", "")

    logger.info(
        f"Manual apply: item={item_id} source={source} source_id={source_id} "
        f"body_keys={sorted(body.keys())}"
    )

    # Immer aus body konstruieren (search_for_item liefert jetzt alle Felder)
    match_result = MatchResult(
        source=source,
        source_id=source_id,
        title=body.get("title") or item.title or "",
        subtitle=body.get("subtitle"),
        author=body.get("author"),
        narrator=body.get("narrator"),
        description=body.get("description"),
        publisher=body.get("publisher"),
        publish_year=body.get("publishYear"),
        series=body.get("series"),
        series_sequence=body.get("seriesSequence"),
        language=body.get("language"),
        genres=body.get("genres") or [],
        cover_url=body.get("cover"),
        confidence=1.0,
    )

    # Mit Details anreichern (Beschreibung, Kapitel) — überschreibt keine vorhandenen Werte
    try:
        if source == "musicbrainz":
            details = await get_release_details(source_id)
            if details:
                _enrich_match(match_result, details)
        elif source == "open_library":
            details = await get_work_details(source_id)
            if details:
                _enrich_match(match_result, details)
    except Exception as e:
        logger.warning(f"Details-Laden fehlgeschlagen ({source}: {source_id}): {e}")

    match_result.confidence = 1.0
    await _apply_match(db, item, match_result, confidence=1.0)
    item.match_locked = True
    item.updated_at = datetime.utcnow()
    await db.commit()
    await db.refresh(item)

    from ..routers.items import _enrich_item_with_files
    return await _enrich_item_with_files(item, db)


@router.delete("/{item_id}/match")
async def clear_match(
    item_id: str,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(LibraryItem).where(LibraryItem.id == item_id))
    item = result.scalar_one_or_none()
    if not item:
        raise HTTPException(status_code=404, detail="Item not found")

    item.matched_source = "none"
    item.matched_id = None
    item.match_confidence = 0.0
    item.match_locked = False
    tags = item.tags or []
    if "zu_prüfen" not in tags:
        tags.append("zu_prüfen")
    item.tags = tags
    item.updated_at = datetime.utcnow()
    await db.commit()
    return {"success": True}