import logging
import sys
from logging.handlers import RotatingFileHandler
from pathlib import Path
from typing import Optional


LOG_LEVEL = logging.DEBUG
LOG_FILE = Path("logs") / "application.log"
LOG_FORMAT = "%(asctime)s | %(name)s | %(levelname)-8s | [%(filename)s:%(lineno)d] | %(message)s"

def setup_logger(name: str = None, level: Optional[int] = logging.NOTSET) -> logging.Logger:
    logger = logging.getLogger(name or __name__)
    logger.setLevel(level)

    if not logger.handlers:
        # Console handler (stdout)
        console_handler = logging.StreamHandler(sys.stdout)
        console_handler.setLevel(level)
        console_formatter = logging.Formatter(LOG_FORMAT)
        console_handler.setFormatter(console_formatter)

        # Verify log file path exist
        LOG_FILE.parent.mkdir(parents=True, exist_ok=True)

        # File handler with rotation (5MB per file, maintains 3 files)
        file_handler = RotatingFileHandler(LOG_FILE, maxBytes=5_242_880, backupCount=3, encoding="utf-8")
        file_handler.setLevel(level)
        file_formatter = logging.Formatter(LOG_FORMAT)
        file_handler.setFormatter(file_formatter)

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

        # Avoid propagating logs back to top twice
        logger.propagate = False

    return logger


logger = setup_logger("my_logger", LOG_LEVEL)

logger.debug("Debug message")
logger.info("Info message")
logger.warning("Warning message")
logger.error("Error message")
logger.critical("Critical message")