import time
import logging
from datetime import datetime
import statistics
import os

class Timer:
    """
    Helper class to track and log the time it takes to process news items.
    Measures time from when an item is added to the queue until it's processed.
    """
    def __init__(self, log_file_path=None):
        self.start_times = {}  # Map of news_id -> start timestamp
        self.processing_times = []  # Store recent processing times for stats
        self.max_history = 100  # Maximum number of processing times to store
        self.log_file_path = log_file_path or "news_processing_times.log"
        self.logger = self._setup_logger()
        self.log_to_file = False  # Flag to control logging to file
        
    def _setup_logger(self):
        """Set up a dedicated logger for timing statistics"""
        logger = logging.getLogger('news_processing_timer')
        if not logger.handlers:
            logger.setLevel(logging.INFO)
            
            # Create log directory if it doesn't exist
            log_dir = os.path.dirname(self.log_file_path)
            if log_dir and not os.path.exists(log_dir):
                os.makedirs(log_dir)
            
            # if self.log_to_file:
            #     # Set up file handler for logging to a file
            #     file_handler = logging.FileHandler(self.log_file_path)
            #     file_handler.setFormatter(logging.Formatter(
            #         '%(asctime)s - %(levelname)s - %(message)s'
            #     ))
            #     logger.addHandler(file_handler)

            # Console handler for immediate visibility
            console_handler = logging.StreamHandler()
            console_handler.setFormatter(logging.Formatter(
                '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
            ))
            logger.addHandler(console_handler)
        
        return logger
    
    def start_timing(self, news_item):
        """Start timing for a news item when it enters the queue"""
        # Get a unique ID for the news item - prefer id attribute if available
        news_id = getattr(news_item, 'id', str(id(news_item)))
        
        # Store the start time
        self.start_times[news_id] = time.time()
        
        # Log the event at debug level
        item_title = getattr(news_item, 'headline', 
                   getattr(news_item, 'title', f"ID: {news_id}"))
        self.logger.debug(f"Started timing for news item: {item_title}")
        
        return news_id
    
    def stop_timing(self, news_item):
        """Stop timing for a news item and log the processing time"""
        end_time = time.time()
        
        # Get a unique ID for the news item
        news_id = getattr(news_item, 'id', str(id(news_item)))
        
        if news_id in self.start_times:
            start_time = self.start_times[news_id]
            process_time = end_time - start_time
            
            # Get title for better logging
            item_title = getattr(news_item, 'headline', 
                      getattr(news_item, 'title', f"ID: {news_id}"))
            
            # Get symbols/ticker if available
            symbols = getattr(news_item, 'symbols', 
                    getattr(news_item, 'ticker', ''))
            symbols_str = ', '.join(symbols) if isinstance(symbols, list) else str(symbols)
            
            # Log the processing time
            self.logger.info(f"Processing time: {process_time:.4f}s - {item_title} - Symbols: {symbols_str}")
            
            # Store for statistics
            self.processing_times.append(process_time)
            if len(self.processing_times) > self.max_history:
                self.processing_times.pop(0)  # Remove oldest
                
            # Remove the entry from the start times dictionary
            del self.start_times[news_id]
            
            return process_time
        else:
            self.logger.warning(f"No start time found for news item: {item_title}")
            return None
    
    def get_queue_stats(self):
        """Get statistics about items currently in the queue"""
        current_time = time.time()
        waiting_times = []
        
        for news_id, start_time in self.start_times.items():
            waiting_time = current_time - start_time
            waiting_times.append(waiting_time)
        
        stats = {
            'queue_size': len(waiting_times),
            'avg_wait_time': sum(waiting_times) / len(waiting_times) if waiting_times else 0,
            'max_wait_time': max(waiting_times) if waiting_times else 0,
            'min_wait_time': min(waiting_times) if waiting_times else 0
        }
        
        self.logger.info(f"Queue stats: {stats['queue_size']} items, avg wait: {stats['avg_wait_time']:.2f}s, max wait: {stats['max_wait_time']:.2f}s")
        return stats
    
    def get_processing_stats(self):
        """Get statistics about recent processing times"""
        if not self.processing_times:
            return {
                'count': 0,
                'avg': 0,
                'max': 0,
                'min': 0,
                'median': 0
            }
            
        stats = {
            'count': len(self.processing_times),
            'avg': sum(self.processing_times) / len(self.processing_times),
            'max': max(self.processing_times),
            'min': min(self.processing_times),
            'median': statistics.median(self.processing_times) if len(self.processing_times) > 0 else 0
        }
        
        self.logger.info(f"Processing stats: {stats['count']} items, avg: {stats['avg']:.4f}s, median: {stats['median']:.4f}s, min: {stats['min']:.4f}s, max: {stats['max']:.4f}s")
        return stats