"""Scheduler for automatic episode checking and downloading"""
import logging
from datetime import datetime
from typing import Optional

from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.triggers.interval import IntervalTrigger

from app.watchlist import watchlist_manager, WatchlistManager
from app.episode_checker import EpisodeChecker, episode_checker

logger = logging.getLogger(__name__)


class AutoDownloadScheduler:
    """Manages automatic episode checking and downloading on a schedule"""

    def __init__(
        self,
        wlm: Optional[WatchlistManager] = None,
        checker: Optional[EpisodeChecker] = None
    ):
        self.wlm = wlm or watchlist_manager
        self.checker = checker or episode_checker
        self.scheduler: Optional[AsyncIOScheduler] = None
        self._running = False

    async def _check_job(self):
        """Job function that runs periodically to check for new episodes"""
        try:
            logger.info("Running scheduled episode check...")
            results = await self.checker.check_all_due()

            # Log summary
            for result in results:
                if result.new_episodes_found > 0:
                    logger.info(
                        f"✓ {result.anime_title}: "
                        f"{result.new_episodes_found} new, "
                        f"{len(result.episodes_downloaded)} downloaded"
                    )

            logger.info(f"Scheduled check complete: processed {len(results)} items")

        except Exception as e:
            logger.error(f"Error in scheduled check job: {e}", exc_info=True)

    def start(self):
        """Start the scheduler"""
        if self._running:
            logger.warning("Scheduler already running")
            return

        try:
            self.scheduler = AsyncIOScheduler()

            # Get initial check interval from settings
            settings = self.wlm.get_settings()
            interval_hours = settings.check_interval_hours

            # Add the job
            self.scheduler.add_job(
                self._check_job,
                trigger=IntervalTrigger(hours=interval_hours),
                id='episode_check',
                name='Check for new episodes',
                replace_existing=True
            )

            # Start the scheduler
            self.scheduler.start()
            self._running = True

            logger.info(
                f"Auto-download scheduler started (checking every {interval_hours}h)"
            )

        except Exception as e:
            logger.error(f"Error starting scheduler: {e}", exc_info=True)
            raise

    def stop(self):
        """Stop the scheduler"""
        if not self._running:
            logger.warning("Scheduler not running")
            return

        try:
            if self.scheduler:
                self.scheduler.shutdown(wait=False)
                self.scheduler = None

            self._running = False
            logger.info("Auto-download scheduler stopped")

        except Exception as e:
            logger.error(f"Error stopping scheduler: {e}", exc_info=True)

    def restart(self):
        """Restart the scheduler with updated settings"""
        logger.info("Restarting scheduler with new settings...")
        self.stop()
        self.start()

    def update_interval(self, hours: int):
        """Update the check interval"""
        if not self._running:
            logger.warning("Scheduler not running, interval will be applied on start")
            return

        try:
            settings = self.wlm.get_settings()
            settings.check_interval_hours = hours
            self.wlm.update_settings(settings)

            # Restart to apply new interval
            self.restart()

            logger.info(f"Updated check interval to {hours}h")

        except Exception as e:
            logger.error(f"Error updating interval: {e}", exc_info=True)

    def get_next_run_time(self) -> Optional[datetime]:
        """Get the next scheduled run time"""
        if not self._running or not self.scheduler:
            return None

        try:
            job = self.scheduler.get_job('episode_check')
            if job:
                return job.next_run_time
        except Exception as e:
            logger.error(f"Error getting next run time: {e}")

        return None

    def is_running(self) -> bool:
        """Check if scheduler is running"""
        return self._running

    async def trigger_check_now(self):
        """Manually trigger an episode check now"""
        logger.info("Manually triggering episode check...")
        try:
            await self._check_job()
        except Exception as e:
            logger.error(f"Error in manual check: {e}", exc_info=True)
            raise


# Global scheduler instance
auto_download_scheduler = AutoDownloadScheduler()