backend/app/core/logger.py

import logging
import sys
from logging.handlers import RotatingFileHandler

from app.core.config import Config


def setup_logging(name: str = "booksage") -> logging.Logger:
    """
    Set up logging configuration with file and console handlers.

    Args:
        name: Logger name

    Returns:
        Configured logger instance
    """
    # Ensure logs directory exists
    Config.LOGS_DIR.mkdir(exist_ok=True)

    logger = logging.getLogger(name)
    logger.setLevel(logging.DEBUG)

    # Prevent adding handlers multiple times
    if logger.handlers:
        return logger

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

    # File handler with rotation
    log_file = Config.LOGS_DIR / "app.log"
    file_handler = RotatingFileHandler(
        log_file,
        maxBytes=10 * 1024 * 1024,  # 10MB
        backupCount=5,
        encoding="utf-8"
    )
    file_handler.setLevel(logging.DEBUG)
    file_handler.setFormatter(formatter)

    # Console handler
    console_handler = logging.StreamHandler(sys.stdout)
    console_handler.setLevel(logging.INFO)
    console_handler.setFormatter(formatter)

    # Add handlers
    logger.addHandler(file_handler)
    logger.addHandler(console_handler)

    return logger


# Create default logger instance
logger = setup_logging()