# bot/library_cache.py

import json
import os
import time
from typing import List
from plex_client import PlexClient

CACHE_FILE = 'bot/library_cache.json'
MAX_CACHE_AGE_HOURS = 6

class LibraryCache:
    def __init__(self):
        if self.is_cache_stale():
            print("📦 Plex cache is stale or missing — refreshing...")
            self.refresh_cache()
        else:
            print("✅ Using cached Plex library data.")
            self.load_cache()

    def is_cache_stale(self) -> bool:
        if not os.path.exists(CACHE_FILE):
            return True
        age_hours = (time.time() - os.path.getmtime(CACHE_FILE)) / 3600
        return age_hours > MAX_CACHE_AGE_HOURS

    def refresh_cache(self):
        plex = PlexClient()
        media = plex.server.library.sections()

        new_data = []
        for section in media:
            if section.type in ['movie', 'show']:
                for item in section.all():
                    new_data.append({
                        'title': item.title.strip(),
                        'type': section.type,
                        'genres': [g.tag for g in getattr(item, 'genres', [])],
                        'year': getattr(item, 'year', None)
                    })

        self.data = new_data
        self.save_cache()

    def save_cache(self):
        with open(CACHE_FILE, 'w', encoding='utf-8') as f:
            json.dump(self.data, f, ensure_ascii=False, indent=2)

    def load_cache(self):
        with open(CACHE_FILE, 'r', encoding='utf-8') as f:
            self.data = json.load(f)

    def get_titles_by_type(self, media_type: str) -> List[str]:
        return [item['title'] for item in self.data if item['type'] == media_type]

    def search(self, title: str, media_type: str = None) -> bool:
        """Check if title exists in library (case-insensitive, optional type filter)."""
        for item in self.data:
            if item['title'].lower() == title.lower() and (media_type is None or item['type'] == media_type):
                return True
        return False