"""
RSS Collector Service
RSS 피드 수집 및 중복 제거 서비스
"""
import asyncio
import logging
import os
import sys
import hashlib
from datetime import datetime
import feedparser
import aiohttp
import redis.asyncio as redis
from typing import List, Dict, Any

# Import from shared module
from shared.models import PipelineJob, RSSItem, EnrichedItem
from shared.queue_manager import QueueManager

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

class RSSCollectorWorker:
    def __init__(self):
        self.queue_manager = QueueManager(
            redis_url=os.getenv("REDIS_URL", "redis://redis:6379")
        )
        self.redis_client = None
        self.redis_url = os.getenv("REDIS_URL", "redis://redis:6379")
        self.dedup_ttl = 86400 * 7  # 7일간 중복 방지
        self.max_items_per_feed = 10  # 피드당 최대 항목 수
        
    async def start(self):
        """워커 시작"""
        logger.info("Starting RSS Collector Worker")
        
        # Redis 연결
        await self.queue_manager.connect()
        self.redis_client = await redis.from_url(
            self.redis_url,
            encoding="utf-8",
            decode_responses=True
        )
        
        # 메인 처리 루프
        while True:
            try:
                # 큐에서 작업 가져오기 (5초 대기)
                job = await self.queue_manager.dequeue('rss_collection', timeout=5)
                
                if job:
                    await self.process_job(job)
                    
            except Exception as e:
                logger.error(f"Error in worker loop: {e}")
                await asyncio.sleep(1)
    
    async def process_job(self, job: PipelineJob):
        """RSS 수집 작업 처리"""
        try:
            logger.info(f"Processing job {job.job_id} for keyword '{job.keyword}'")
            
            keyword = job.data.get('keyword', '')
            rss_feeds = job.data.get('rss_feeds', [])
            
            # 키워드가 포함된 RSS URL 생성
            processed_feeds = self._prepare_feeds(rss_feeds, keyword)
            
            all_items = []
            
            for feed_url in processed_feeds:
                try:
                    items = await self._fetch_rss_feed(feed_url, keyword)
                    all_items.extend(items)
                except Exception as e:
                    logger.error(f"Error fetching feed {feed_url}: {e}")
            
            if all_items:
                # 중복 제거
                unique_items = await self._deduplicate_items(all_items, keyword)
                
                if unique_items:
                    logger.info(f"Collected {len(unique_items)} unique items for '{keyword}'")
                    
                    # 다음 단계로 전달
                    job.data['rss_items'] = [item.dict() for item in unique_items]
                    job.stages_completed.append('rss_collection')
                    job.stage = 'search_enrichment'
                    
                    await self.queue_manager.enqueue('search_enrichment', job)
                    await self.queue_manager.mark_completed('rss_collection', job.job_id)
                else:
                    logger.info(f"No new items found for '{keyword}'")
                    await self.queue_manager.mark_completed('rss_collection', job.job_id)
            else:
                logger.warning(f"No RSS items collected for '{keyword}'")
                await self.queue_manager.mark_failed(
                    'rss_collection', 
                    job, 
                    "No RSS items collected"
                )
                
        except Exception as e:
            logger.error(f"Error processing job {job.job_id}: {e}")
            await self.queue_manager.mark_failed('rss_collection', job, str(e))
    
    def _prepare_feeds(self, feeds: List[str], keyword: str) -> List[str]:
        """RSS 피드 URL 준비 (키워드 치환)"""
        processed = []
        for feed in feeds:
            if '{keyword}' in feed:
                processed.append(feed.replace('{keyword}', keyword))
            else:
                processed.append(feed)
        return processed
    
    async def _fetch_rss_feed(self, feed_url: str, keyword: str) -> List[RSSItem]:
        """RSS 피드 가져오기"""
        items = []
        
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(feed_url, timeout=30) as response:
                    content = await response.text()
                    
            # feedparser로 파싱
            feed = feedparser.parse(content)
            
            for entry in feed.entries[:self.max_items_per_feed]:
                # 키워드 관련성 체크
                title = entry.get('title', '')
                summary = entry.get('summary', '')
                
                # 제목이나 요약에 키워드가 포함된 경우만
                if keyword.lower() in title.lower() or keyword.lower() in summary.lower():
                    item = RSSItem(
                        title=title,
                        link=entry.get('link', ''),
                        published=entry.get('published', ''),
                        summary=summary[:500] if summary else '',
                        source_feed=feed_url
                    )
                    items.append(item)
                    
        except Exception as e:
            logger.error(f"Error fetching RSS feed {feed_url}: {e}")
            
        return items
    
    async def _deduplicate_items(self, items: List[RSSItem], keyword: str) -> List[RSSItem]:
        """중복 항목 제거"""
        unique_items = []
        dedup_key = f"dedup:{keyword}"
        
        for item in items:
            # 제목 해시 생성
            item_hash = hashlib.md5(
                f"{keyword}:{item.title}".encode()
            ).hexdigest()
            
            # Redis Set으로 중복 확인
            is_new = await self.redis_client.sadd(dedup_key, item_hash)
            
            if is_new:
                unique_items.append(item)
        
        # TTL 설정
        if unique_items:
            await self.redis_client.expire(dedup_key, self.dedup_ttl)
        
        return unique_items
    
    async def stop(self):
        """워커 중지"""
        await self.queue_manager.disconnect()
        if self.redis_client:
            await self.redis_client.close()
        logger.info("RSS Collector Worker stopped")

async def main():
    """메인 함수"""
    worker = RSSCollectorWorker()
    
    try:
        await worker.start()
    except KeyboardInterrupt:
        logger.info("Received interrupt signal")
    finally:
        await worker.stop()

if __name__ == "__main__":
    asyncio.run(main())