import logging
import os
import sys
from datetime import datetime

class Logger:
    """
    Centralized logging class for the application.
    """
    
    _instance = None
    
    def __new__(cls):
        """
        Singleton pattern to ensure only one logger instance is created.
        """
        if cls._instance is None:
            cls._instance = super(Logger, cls).__new__(cls)
            cls._instance._initialize_logger()
        return cls._instance
    
    def _initialize_logger(self):
        """
        Initialize the logger with console and file handlers.
        """
        # Create logs directory if it doesn't exist
        logs_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), 'logs')
        os.makedirs(logs_dir, exist_ok=True)
        
        # Create a logger
        self.logger = logging.getLogger('adf_chatbot')
        self.logger.setLevel(logging.DEBUG)
        
        # Create formatters
        console_formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
        file_formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(name)s - %(filename)s:%(lineno)d - %(message)s')
        
        # Create console handler
        console_handler = logging.StreamHandler(sys.stdout)
        console_handler.setLevel(logging.INFO)
        console_handler.setFormatter(console_formatter)
        
        # Create file handler
        log_file = os.path.join(logs_dir, f'adf_chatbot_{datetime.now().strftime("%Y%m%d")}.log')
        file_handler = logging.FileHandler(log_file)
        file_handler.setLevel(logging.DEBUG)
        file_handler.setFormatter(file_formatter)
        
        # Add handlers to logger
        self.logger.addHandler(console_handler)
        self.logger.addHandler(file_handler)
    
    def get_logger(self):
        """
        Get the logger instance.
        
        Returns:
            logging.Logger: The logger instance.
        """
        return self.logger

# Create a global logger instance
logger = Logger().get_logger()

def get_logger():
    """
    Get the global logger instance.
    
    Returns:
        logging.Logger: The global logger instance.
    """
    return logger