import asyncio
import json
import logging
from datetime import datetime, timezone

from app.config import settings
from app.database import get_db
from app.services.jellyfin import get_all_movies, get_played_movie_ids, get_users

logger = logging.getLogger("movie-night.sync")


async def sync_movie_metadata():
    """Full sync of movie metadata from Jellyfin."""
    logger.info("Starting movie metadata sync...")

    users = await get_users()
    if not users:
        logger.warning("No Jellyfin users found, skipping sync")
        return

    # Use first user to fetch library (all users see the same movies)
    user_id = users[0]["id"]
    movies = await get_all_movies(user_id)
    logger.info(f"Fetched {len(movies)} movies from Jellyfin")

    db = await get_db()
    try:
        now = datetime.now(timezone.utc).isoformat()
        for movie in movies:
            await db.execute(
                """INSERT OR REPLACE INTO movies
                   (jellyfin_id, title, sort_title, year, genres, overview,
                    community_rating, critic_rating, runtime_minutes, content_rating,
                    studios, people, tags, synced_at)
                   VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
                (
                    movie["jellyfin_id"],
                    movie["title"],
                    movie["sort_title"],
                    movie["year"],
                    json.dumps(movie["genres"]),
                    movie["overview"],
                    movie["community_rating"],
                    movie["critic_rating"],
                    movie["runtime_minutes"],
                    movie["content_rating"],
                    json.dumps(movie["studios"]),
                    json.dumps(movie["people"]),
                    json.dumps(movie["tags"]),
                    now,
                ),
            )

        # Update sync timestamp
        await db.execute(
            "INSERT OR REPLACE INTO sync_status (key, value) VALUES ('last_metadata_sync', ?)",
            (now,),
        )
        await db.commit()
        logger.info(f"Movie metadata sync complete: {len(movies)} movies")
    finally:
        await db.close()


async def sync_watch_state():
    """Sync watch state for all users."""
    logger.info("Starting watch state sync...")

    users = await get_users()
    db = await get_db()
    try:
        now = datetime.now(timezone.utc).isoformat()

        for user in users:
            played_ids = await get_played_movie_ids(user["id"])
            logger.info(f"User {user['name']}: {len(played_ids)} played movies")

            # Get all movie IDs
            cursor = await db.execute("SELECT jellyfin_id FROM movies")
            all_movie_ids = {row["jellyfin_id"] for row in await cursor.fetchall()}

            for movie_id in all_movie_ids:
                is_played = 1 if movie_id in played_ids else 0
                await db.execute(
                    """INSERT OR REPLACE INTO watch_state
                       (jellyfin_id, user_id, is_played, synced_at)
                       VALUES (?, ?, ?, ?)""",
                    (movie_id, user["id"], is_played, now),
                )

        await db.execute(
            "INSERT OR REPLACE INTO sync_status (key, value) VALUES ('last_watch_sync', ?)",
            (now,),
        )
        await db.commit()
        logger.info("Watch state sync complete")
    finally:
        await db.close()


async def needs_metadata_sync() -> bool:
    db = await get_db()
    try:
        cursor = await db.execute(
            "SELECT value FROM sync_status WHERE key = 'last_metadata_sync'"
        )
        row = await cursor.fetchone()
        if not row:
            return True
        last_sync = datetime.fromisoformat(row["value"])
        age_hours = (datetime.now(timezone.utc) - last_sync).total_seconds() / 3600
        return age_hours > settings.sync_interval_hours
    finally:
        await db.close()


async def needs_watch_sync() -> bool:
    db = await get_db()
    try:
        cursor = await db.execute(
            "SELECT value FROM sync_status WHERE key = 'last_watch_sync'"
        )
        row = await cursor.fetchone()
        if not row:
            return True
        last_sync = datetime.fromisoformat(row["value"])
        age_hours = (datetime.now(timezone.utc) - last_sync).total_seconds() / 3600
        return age_hours > settings.watch_state_sync_hours
    finally:
        await db.close()


async def run_periodic_sync():
    """Background task that periodically syncs library data."""
    # Initial sync on startup
    try:
        if await needs_metadata_sync():
            await sync_movie_metadata()
        if await needs_watch_sync():
            await sync_watch_state()
    except Exception as e:
        logger.error(f"Initial sync failed: {e}")

    # Periodic sync loop
    while True:
        try:
            await asyncio.sleep(3600)  # Check every hour

            if await needs_metadata_sync():
                await sync_movie_metadata()
            if await needs_watch_sync():
                await sync_watch_state()
        except asyncio.CancelledError:
            break
        except Exception as e:
            logger.error(f"Periodic sync failed: {e}")