"""Logging configuration for Video Summary application."""

import logging
import sys
from typing import Optional


def setup_logger(name: str = "video_summary", level: int = logging.INFO, log_file: Optional[str] = None) -> logging.Logger:
    """
    Configure and return a logger instance.

    Args:
        name: Logger name
        level: Logging level (default: INFO)
        log_file: Optional log file path. If None, logs to stdout only.

    Returns:
        Configured logger instance
    """
    logger = logging.getLogger(name)
    logger.setLevel(level)

    # Prevent duplicate handlers
    if logger.handlers:
        return logger

    # Create formatter
    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s", datefmt="%Y-%m-%d %H:%M:%S")

    # Console handler
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setLevel(level)
    console_handler.setFormatter(formatter)
    logger.addHandler(console_handler)

    # File handler (optional)
    if log_file:
        file_handler = logging.FileHandler(log_file)
        file_handler.setLevel(level)
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)

    return logger


def get_logger(name: str = "video_summary") -> logging.Logger:
    """
    Get an existing logger instance.

    Args:
        name: Logger name

    Returns:
        Logger instance
    """
    return logging.getLogger(name)