"""
Logging configuration for UAP Data Analysis Tool
Provides consistent logging setup across all modules
"""

import logging
import sys
from datetime import datetime
import os

def setup_logging(
    log_level: str = "INFO",
    log_file: str = None,
    log_format: str = None
) -> logging.Logger:
    """
    Set up logging configuration for the application
    
    Args:
        log_level: Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
        log_file: Optional log file path
        log_format: Custom log format string
        
    Returns:
        Configured logger instance
    """
    
    # Default format if not provided
    if log_format is None:
        log_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
    
    # Create logs directory if logging to file
    if log_file:
        os.makedirs(os.path.dirname(log_file), exist_ok=True)
    
    # Configure root logger
    logging.basicConfig(
        level=getattr(logging, log_level.upper()),
        format=log_format,
        handlers=[
            logging.StreamHandler(sys.stdout),
            logging.FileHandler(log_file) if log_file else logging.NullHandler()
        ]
    )
    
    # Set specific loggers to WARNING to reduce noise
    logging.getLogger('matplotlib').setLevel(logging.WARNING)
    logging.getLogger('PIL').setLevel(logging.WARNING)
    logging.getLogger('urllib3').setLevel(logging.WARNING)
    
    logger = logging.getLogger('UAP_Analytics')
    logger.info(f"Logging initialized at {log_level} level")
    
    return logger

# Performance logging decorator
def log_performance(func):
    """Decorator to log function execution time"""
    import functools
    import time
    
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        logger = logging.getLogger(func.__module__)
        start_time = time.time()
        
        try:
            result = func(*args, **kwargs)
            execution_time = time.time() - start_time
            logger.info(f"{func.__name__} completed in {execution_time:.2f}s")
            return result
        except Exception as e:
            execution_time = time.time() - start_time
            logger.error(f"{func.__name__} failed after {execution_time:.2f}s: {e}")
            raise
            
    return wrapper

# Error logging decorator
def log_errors(func):
    """Decorator to log function errors"""
    import functools
    
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        logger = logging.getLogger(func.__module__)
        
        try:
            return func(*args, **kwargs)
        except Exception as e:
            logger.error(f"Error in {func.__name__}: {e}", exc_info=True)
            raise
            
    return wrapper

# Initialize default logger
default_logger = setup_logging(
    log_level=os.getenv('LOG_LEVEL', 'INFO'),
    log_file=os.getenv('LOG_FILE', None)
)