import logging
from logging.handlers import RotatingFileHandler
import os

# Ensure logs directory exists
LOG_DIR = os.path.join(os.getcwd(), "logs")
os.makedirs(LOG_DIR, exist_ok=True)
LOG_FILE_PATH = os.path.join(LOG_DIR, "error.log")

def setup_logger():
    logger = logging.getLogger("fastapi_app")
    logger.setLevel(logging.ERROR)

    # Prevent logs from propagating to the root logger twice
    logger.propagate = False

    if not logger.handlers:
        # 5MB per file, max 5 backup files
        file_handler = RotatingFileHandler(LOG_FILE_PATH, maxBytes=5*1024*1024, backupCount=5)
        file_handler.setLevel(logging.ERROR)

        formatter = logging.Formatter(
            "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
        )
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)

    return logger

app_logger = setup_logger()