"""
Scraping worker module.

This module provides a worker that consumes scraping tasks
from RabbitMQ and executes scraping operations.
"""

import logging
from typing import Dict, List
from sqlalchemy.orm import Session

from app.scrapers.twitter_scraper import TwitterScraper, create_twitter_scraper
from app.scrapers.reddit_scraper import RedditScraper, create_reddit_scraper

logger = logging.getLogger(__name__)


class ScrapingWorker:
    """
    Worker for processing scraping tasks.
    
    Features:
    - Consumes tasks from scraping_tasks queue
    - Executes Twitter and Reddit scraping
    - Publishes results to results queue
    - Handles errors with retries
    - Structured logging
    """
    
    def __init__(
        self,
        twitter_bearer_token: str,
        reddit_client_id: str,
        reddit_client_secret: str
    ):
        """
        Initialize scraping worker.
        
        Args:
            twitter_bearer_token: Twitter API bearer token
            reddit_client_id: Reddit API client ID
            reddit_client_secret: Reddit API client secret
        """
        self.twitter_bearer_token = twitter_bearer_token
        self.reddit_client_id = reddit_client_id
        self.reddit_client_secret = reddit_client_secret
        
        # Initialize scrapers (lazy initialization)
        self.twitter_scraper: TwitterScraper = None
        self.reddit_scraper: RedditScraper = None
    
    def _get_twitter_scraper(self) -> TwitterScraper:
        """Get or create Twitter scraper instance."""
        if self.twitter_scraper is None:
            self.twitter_scraper = create_twitter_scraper(
                bearer_token=self.twitter_bearer_token,
                vip_match_ids=[]
            )
        return self.twitter_scraper
    
    def _get_reddit_scraper(self) -> RedditScraper:
        """Get or create Reddit scraper instance."""
        if self.reddit_scraper is None:
            self.reddit_scraper = create_reddit_scraper(
                client_id=self.reddit_client_id,
                client_secret=self.reddit_client_secret
            )
        return self.reddit_scraper
    
    def execute_scraping_task(
        self,
        task: Dict,
        db: Session
    ) -> Dict:
        """
        Execute a scraping task.
        
        Args:
            task: Scraping task data
            db: Database session
            
        Returns:
            Dictionary with scraping results
        """
        source = task.get('source')
        match_id = task.get('match_id')
        keywords = task.get('keywords', [])
        priority = task.get('priority', 'normal')
        
        logger.info(
            f"🔧 Executing scraping task: match_id={match_id}, "
            f"source={source}, priority={priority}"
        )
        
        try:
            if source == 'twitter':
                return self._execute_twitter_scraping(match_id, keywords, db)
            elif source == 'reddit':
                return self._execute_reddit_scraping(match_id, keywords, db)
            else:
                logger.error(f"❌ Unknown scraping source: {source}")
                return {
                    'collected_count': 0,
                    'status': 'error',
                    'error': f'Unknown source: {source}'
                }
                
        except Exception as e:
            logger.error(f"❌ Scraping task failed: {e}")
            return {
                'collected_count': 0,
                'status': 'error',
                'error': str(e)
            }
    
    def _execute_twitter_scraping(
        self,
        match_id: int,
        keywords: List[str],
        db: Session
    ) -> Dict:
        """
        Execute Twitter scraping.
        
        Args:
            match_id: Match identifier
            keywords: Search keywords
            db: Database session
            
        Returns:
            Dictionary with scraping results
        """
        try:
            scraper = self._get_twitter_scraper()
            
            # Scrape and save tweets
            tweets = scraper.scrape_and_save(
                match_id=match_id,
                keywords=keywords,
                db=db,
                max_results=100
            )
            
            logger.info(
                f"✅ Twitter scraping completed: {len(tweets)} tweets collected"
            )
            
            return {
                'collected_count': len(tweets),
                'status': 'success',
                'metadata': {
                    'source': 'twitter',
                    'match_id': match_id,
                    'keywords': keywords
                }
            }
            
        except Exception as e:
            logger.error(f"❌ Twitter scraping failed: {e}")
            return {
                'collected_count': 0,
                'status': 'error',
                'error': str(e)
            }
    
    def _execute_reddit_scraping(
        self,
        match_id: int,
        keywords: List[str],
        db: Session
    ) -> Dict:
        """
        Execute Reddit scraping.
        
        Args:
            match_id: Match identifier
            keywords: Search keywords
            db: Database session
            
        Returns:
            Dictionary with scraping results
        """
        try:
            scraper = self._get_reddit_scraper()
            
            # Scrape and save Reddit posts
            result = scraper.scrape_and_save(
                match_id=match_id,
                db=db,
                keywords=keywords,
                scrape_comments=True
            )
            
            posts = result.get('posts', [])
            comments = result.get('comments', [])
            
            logger.info(
                f"✅ Reddit scraping completed: "
                f"{len(posts)} posts, {len(comments)} comments collected"
            )
            
            return {
                'collected_count': len(posts) + len(comments),
                'status': 'success',
                'metadata': {
                    'source': 'reddit',
                    'match_id': match_id,
                    'keywords': keywords,
                    'posts_count': len(posts),
                    'comments_count': len(comments)
                }
            }
            
        except Exception as e:
            logger.error(f"❌ Reddit scraping failed: {e}")
            return {
                'collected_count': 0,
                'status': 'error',
                'error': str(e)
            }


def create_scraping_worker(
    twitter_bearer_token: str,
    reddit_client_id: str,
    reddit_client_secret: str
) -> ScrapingWorker:
    """
    Factory function to create a scraping worker.
    
    Args:
        twitter_bearer_token: Twitter API bearer token
        reddit_client_id: Reddit API client ID
        reddit_client_secret: Reddit API client secret
        
    Returns:
        Configured ScrapingWorker instance
    """
    return ScrapingWorker(
        twitter_bearer_token=twitter_bearer_token,
        reddit_client_id=reddit_client_id,
        reddit_client_secret=reddit_client_secret
    )