import json
from pathlib import Path
from datetime import datetime
from typing import Optional

from ..models.schemas import VideoAnalysis, ChannelAnalysis

class CacheManager:
    def __init__(self, cache_dir: str = "cache"):
        self.cache_dir = Path(cache_dir)
        self.videos_dir = self.cache_dir / "videos"
        self.channels_dir = self.cache_dir / "channels"
        
        # 캐시 디렉토리 생성
        self.videos_dir.mkdir(parents=True, exist_ok=True)
        self.channels_dir.mkdir(parents=True, exist_ok=True)
    
    def get_video_analysis(self, video_id: str) -> Optional[VideoAnalysis]:
        video_file = self.videos_dir / f"{video_id}.json"
        if not video_file.exists():
            return None
            
        with video_file.open('r', encoding='utf-8') as f:
            return VideoAnalysis.from_dict(json.load(f))
    
    def save_video_analysis(self, analysis: VideoAnalysis):
        video_file = self.videos_dir / f"{analysis.video_id}.json"
        with video_file.open('w', encoding='utf-8') as f:
            json.dump(analysis.to_dict(), f, ensure_ascii=False, indent=2)
    
    def get_channel_analysis(self, channel_id: str) -> Optional[ChannelAnalysis]:
        channel_file = self.channels_dir / f"{channel_id}.json"
        if not channel_file.exists():
            return None
            
        with channel_file.open('r', encoding='utf-8') as f:
            data = json.load(f)
            return ChannelAnalysis(
                channel_id=data['channel_id'],
                channel_name=data['channel_name'],
                last_analyzed=datetime.fromisoformat(data['last_analyzed']),
                analyzed_videos=data['analyzed_videos']
            )
    
    def save_channel_analysis(self, analysis: ChannelAnalysis):
        channel_file = self.channels_dir / f"{analysis.channel_id}.json"
        with channel_file.open('w', encoding='utf-8') as f:
            json.dump({
                'channel_id': analysis.channel_id,
                'channel_name': analysis.channel_name,
                'last_analyzed': analysis.last_analyzed.isoformat(),
                'analyzed_videos': analysis.analyzed_videos
            }, f, ensure_ascii=False, indent=2)