"""
Logging utility module using Python standard library logging with file location info.
"""

import logging
import logging.handlers
import sys
import os
import inspect
from datetime import datetime


class LocationFormatter(logging.Formatter):
    """Custom formatter that adds file location information."""
    
    def format(self, record):
        # Use location info if provided via extra, otherwise extract from record
        if not hasattr(record, 'location'):
            # Fallback: extract from record itself
            filename = os.path.basename(record.pathname) if record.pathname else "unknown"
            function_name = record.funcName if record.funcName else "unknown"
            line_number = record.lineno if record.lineno else 0
            record.location = f"{filename}:{function_name}:{line_number}"
        
        return super().format(record)


def setup_logger():
    """Setup the main logger with console and file handlers."""
    # Create logger
    logger = logging.getLogger('comfyui_copilot')
    logger.setLevel(logging.DEBUG)
    
    # Prevent duplicate logs
    if logger.handlers:
        return logger
    
    # Console handler with color support
    console_handler = logging.StreamHandler(sys.stderr)
    console_handler.setLevel(logging.DEBUG)
    
    # Console formatter with colors (simple format for better compatibility)
    console_format = '%(asctime)s | %(levelname)-8s | %(location)s | %(message)s'
    console_formatter = LocationFormatter(console_format, datefmt='%Y-%m-%d %H:%M:%S')
    console_handler.setFormatter(console_formatter)
    
    # File handler
    log_dir = os.path.join(os.path.dirname(__file__), "..", "logs")
    os.makedirs(log_dir, exist_ok=True)
    
    file_handler = logging.handlers.RotatingFileHandler(
        os.path.join(log_dir, "comfyui_copilot.log"),
        maxBytes=10*1024*1024,  # 10MB
        backupCount=7
    )
    file_handler.setLevel(logging.DEBUG)
    
    # File formatter
    file_format = '%(asctime)s | %(levelname)-8s | %(location)s | %(message)s'
    file_formatter = LocationFormatter(file_format, datefmt='%Y-%m-%d %H:%M:%S')
    file_handler.setFormatter(file_formatter)
    
    # Add handlers to logger
    logger.addHandler(console_handler)
    logger.addHandler(file_handler)
    
    return logger


class Logger:
    """Logger wrapper that provides convenient logging methods with automatic location detection."""
    
    def __init__(self, name=None):
        self._logger = setup_logger()
        if name:
            self._logger = logging.getLogger(f'comfyui_copilot.{name}')
            self._logger.setLevel(logging.DEBUG)
            # Prevent propagation to parent logger to avoid duplicate messages
            self._logger.propagate = False
            
            # Copy handlers from parent logger if the named logger doesn't have any
            if not self._logger.handlers:
                parent_logger = logging.getLogger('comfyui_copilot')
                for handler in parent_logger.handlers:
                    self._logger.addHandler(handler)
    
    def _log_with_location(self, level, message, *args, **kwargs):
        """Log message with automatic location detection."""
        # Get the caller's frame (2 levels up: _log_with_location -> debug/info/etc -> actual caller)
        frame = inspect.currentframe().f_back.f_back
        try:
            filename = os.path.basename(frame.f_code.co_filename)
            function_name = frame.f_code.co_name
            line_number = frame.f_lineno
            
            # Create a log record manually to ensure no duplicate processing
            if self._logger.isEnabledFor(level):
                record = self._logger.makeRecord(
                    self._logger.name, level, frame.f_code.co_filename, line_number,
                    message, args, None, function_name
                )
                record.location = f"{filename}:{function_name}:{line_number}"
                
                # Process the record through handlers directly to avoid duplication
                for handler in self._logger.handlers:
                    if record.levelno >= handler.level:
                        handler.handle(record)
        finally:
            del frame
    
    def debug(self, message, *args, **kwargs):
        """Log debug message."""
        self._log_with_location(logging.DEBUG, message, *args, **kwargs)
    
    def info(self, message, *args, **kwargs):
        """Log info message."""
        self._log_with_location(logging.INFO, message, *args, **kwargs)
    
    def warning(self, message, *args, **kwargs):
        """Log warning message."""
        self._log_with_location(logging.WARNING, message, *args, **kwargs)
    
    def warn(self, message, *args, **kwargs):
        """Log warning message (alias for warning)."""
        self.warning(message, *args, **kwargs)
    
    def error(self, message, *args, **kwargs):
        """Log error message."""
        self._log_with_location(logging.ERROR, message, *args, **kwargs)
    
    def critical(self, message, *args, **kwargs):
        """Log critical message."""
        self._log_with_location(logging.CRITICAL, message, *args, **kwargs)
    
    def exception(self, message, *args, **kwargs):
        """Log exception message with traceback."""
        # For exceptions, we want to use the standard logger.exception which includes traceback
        frame = inspect.currentframe().f_back
        try:
            filename = os.path.basename(frame.f_code.co_filename)
            function_name = frame.f_code.co_name
            line_number = frame.f_lineno
            
            # Use the standard exception logging with location info
            self._logger.exception(message, *args, **kwargs, 
                                 extra={'location': f"{filename}:{function_name}:{line_number}"},
                                 stacklevel=2)
        finally:
            del frame


# Create default logger instance
log = Logger()

# For backward compatibility and convenience
debug = log.debug
info = log.info
warning = log.warning
warn = log.warn
error = log.error
critical = log.critical
exception = log.exception

# Allow creating named loggers
def get_logger(name=None):
    """Get a logger instance, optionally with a specific name."""
    return Logger(name)


__all__ = [
    'log', 'Logger', 'get_logger',
    'debug', 'info', 'warning', 'warn', 'error', 'critical', 'exception'
]