"""
Watchlist management routes for Ohm Stream Downloader API.
"""

import re
from typing import List, Optional

from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException

from app.download_manager import DownloadManager
from app.downloaders import get_downloader
from app.models import DownloadRequest
from app.models.auth import User
from app.models.watchlist import (
    WatchlistItem,
    WatchlistItemCreate,
    WatchlistItemUpdate,
    WatchlistSettings,
    WatchlistStatus,
)
from app.routers.router_auth import get_current_user_from_token

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


def get_download_manager() -> DownloadManager:
    from main import download_manager

    return download_manager


@router.post("", response_model=WatchlistItem)
async def add_to_watchlist(
    item_data: WatchlistItemCreate,
    current_user: User = Depends(get_current_user_from_token),
):
    """Add an anime to the watchlist"""
    from main import watchlist_manager

    try:
        item = watchlist_manager.create(current_user.id, item_data)
        return item
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error adding to watchlist: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.get("", response_model=List[WatchlistItem])
async def get_watchlist(
    status: Optional[WatchlistStatus] = None,
    current_user: User = Depends(get_current_user_from_token),
):
    """Get user's watchlist"""
    from main import watchlist_manager

    try:
        items = watchlist_manager.get_all(user_id=current_user.id, status=status)
        return items
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error getting watchlist: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/settings", response_model=WatchlistSettings)
async def get_watchlist_settings(
    current_user: User = Depends(get_current_user_from_token),
):
    """Get global watchlist settings"""
    from main import watchlist_manager

    try:
        settings = watchlist_manager.get_settings()
        return settings
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error getting watchlist settings: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.put("/settings", response_model=WatchlistSettings)
async def update_watchlist_settings(
    settings: WatchlistSettings,
    current_user: User = Depends(get_current_user_from_token),
):
    """Update global watchlist settings"""
    from main import auto_download_scheduler, watchlist_manager

    try:
        updated_settings = watchlist_manager.update_settings(settings)
        if auto_download_scheduler.is_running():
            auto_download_scheduler.restart()
        return updated_settings
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error updating watchlist settings: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/stats")
async def get_watchlist_stats(
    current_user: User = Depends(get_current_user_from_token),
):
    """Get watchlist statistics"""
    from main import watchlist_manager

    try:
        stats = watchlist_manager.get_stats(user_id=current_user.id)
        return stats
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error getting watchlist stats: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/check-all")
async def check_all_watchlist_items(
    current_user: User = Depends(get_current_user_from_token),
):
    """Manually trigger a check for all due watchlist items"""
    from main import episode_checker, watchlist_manager

    try:
        results = await episode_checker.check_all_due()
        user_results = []
        for result in results:
            item = watchlist_manager.get_by_id(result.watchlist_item_id)
            if item and item.user_id == current_user.id:
                user_results.append(result)

        return {
            "status": "success",
            "checked": len(user_results),
            "total_new_episodes": sum(r.new_episodes_found for r in user_results),
            "total_downloaded": sum(len(r.episodes_downloaded) for r in user_results),
            "results": user_results,
        }
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error checking all watchlist items: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/scheduler/status")
async def get_scheduler_status(
    current_user: User = Depends(get_current_user_from_token),
):
    """Get auto-download scheduler status"""
    from main import auto_download_scheduler, watchlist_manager

    try:
        return {
            "running": auto_download_scheduler.is_running(),
            "next_run": auto_download_scheduler.get_next_run_time(),
            "settings": watchlist_manager.get_settings(),
        }
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error getting scheduler status: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/scheduler/start")
async def start_scheduler(
    current_user: User = Depends(get_current_user_from_token),
):
    """Start the auto-download scheduler"""
    from main import auto_download_scheduler

    try:
        if auto_download_scheduler.is_running():
            return {
                "status": "already_running",
                "message": "Scheduler is already running",
            }
        auto_download_scheduler.start()
        return {"status": "started", "message": "Scheduler started successfully"}
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error starting scheduler: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/scheduler/stop")
async def stop_scheduler(
    current_user: User = Depends(get_current_user_from_token),
):
    """Stop the auto-download scheduler"""
    from main import auto_download_scheduler

    try:
        if not auto_download_scheduler.is_running():
            return {"status": "not_running", "message": "Scheduler is not running"}
        auto_download_scheduler.stop()
        return {"status": "stopped", "message": "Scheduler stopped successfully"}
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error stopping scheduler: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/{item_id}", response_model=WatchlistItem)
async def get_watchlist_item(
    item_id: str,
    current_user: User = Depends(get_current_user_from_token),
):
    """Get a specific watchlist item"""
    from main import watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")
        return item
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error getting watchlist item: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.put("/{item_id}", response_model=WatchlistItem)
async def update_watchlist_item(
    item_id: str,
    update_data: WatchlistItemUpdate,
    current_user: User = Depends(get_current_user_from_token),
):
    """Update a watchlist item"""
    from main import watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")
        updated_item = watchlist_manager.update(item_id, update_data)
        return updated_item
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error updating watchlist item: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.delete("/{item_id}")
async def delete_watchlist_item(
    item_id: str,
    current_user: User = Depends(get_current_user_from_token),
):
    """Delete an anime from the watchlist"""
    from main import watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")
        success = watchlist_manager.delete(item_id)
        if not success:
            raise HTTPException(status_code=500, detail="Failed to delete item")
        return {"status": "success", "message": "Item deleted from watchlist"}
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error deleting watchlist item: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/{item_id}/check")
async def check_watchlist_item(
    item_id: str,
    current_user: User = Depends(get_current_user_from_token),
):
    """Manually trigger a check for new episodes"""
    from main import episode_checker, watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")
        result = await episode_checker.manual_check(item_id)
        if not result:
            raise HTTPException(status_code=500, detail="Check failed")
        return result
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error checking watchlist item: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/{item_id}/download-all")
async def download_all_episodes(
    item_id: str,
    background_tasks: BackgroundTasks,
    current_user: User = Depends(get_current_user_from_token),
):
    """Download the LATEST SEASON episodes for a watchlist item"""
    from main import download_manager, watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")

        downloader = get_downloader(item.anime_url)
        latest_season_url = item.anime_url

        if hasattr(downloader, "get_seasons"):
            try:
                seasons = await downloader.get_seasons(item.anime_url)
                if seasons and len(seasons) > 0:
                    latest_season = seasons[-1]
                    latest_season_url = latest_season.get("url", item.anime_url)
            except Exception as e:
                from logging import getLogger

                logger = getLogger(__name__)
                logger.warning(f"Could not fetch seasons, using default URL: {e}")

        episodes = await downloader.get_episodes(latest_season_url, item.lang)

        if not episodes:
            return {
                "status": "warning",
                "message": f"No episodes found for {item.anime_title}",
                "result": {"new_episodes_found": 0, "episodes_downloaded": []},
            }

        task_ids = []
        season_match = re.search(r"saison(\d+)", latest_season_url, re.IGNORECASE)
        season_num = season_match.group(1) if season_match else "1"
        anime_title_clean = (
            item.anime_title.replace("/", "-").replace("\\", "-").strip()
        )

        for episode in episodes:
            ep_num = episode.get("episode", "01")
            filename = f"{anime_title_clean} - S{season_num} - Episode {ep_num}.mp4"
            request = DownloadRequest(url=episode["url"], filename=filename)
            task = download_manager.create_task(request)
            task_ids.append(task.id)
            background_tasks.add_task(download_manager.start_download, task.id)

        watchlist_manager.update(
            item_id,
            {"last_episode_downloaded": len(episodes), "total_episodes": len(episodes)},
        )

        return {
            "status": "success",
            "message": f"Downloading {len(task_ids)} episodes from latest season for {item.anime_title}",
            "task_ids": task_ids,
            "total_episodes": len(episodes),
            "season_url": latest_season_url,
        }
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error downloading all episodes: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/{item_id}/pause", response_model=WatchlistItem)
async def pause_watchlist_item(
    item_id: str,
    current_user: User = Depends(get_current_user_from_token),
):
    """Pause automatic downloading for a specific anime"""
    from main import watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")
        update_data = WatchlistItemUpdate(status=WatchlistStatus.PAUSED)
        updated_item = watchlist_manager.update(item_id, update_data)
        return updated_item
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error pausing watchlist item: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/{item_id}/resume", response_model=WatchlistItem)
async def resume_watchlist_item(
    item_id: str,
    current_user: User = Depends(get_current_user_from_token),
):
    """Resume automatic downloading for a paused anime"""
    from main import watchlist_manager

    try:
        item = watchlist_manager.get_by_id(item_id)
        if not item:
            raise HTTPException(status_code=404, detail="Watchlist item not found")
        if item.user_id != current_user.id:
            raise HTTPException(status_code=403, detail="Access denied")
        update_data = WatchlistItemUpdate(status=WatchlistStatus.ACTIVE)
        updated_item = watchlist_manager.update(item_id, update_data)
        return updated_item
    except HTTPException:
        raise
    except Exception as e:
        from logging import getLogger

        logger = getLogger(__name__)
        logger.error(f"Error resuming watchlist item: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))