"""
Application logger for SmartTrip AI.

Creates a daily rotating log file under logs/ and also writes to stdout.
Call get_logger(name) from any module to get a named logger.
"""

import logging
import os
from datetime import datetime


def get_logger(name: str = "smarttrip_ai") -> logging.Logger:
    """
    Return a configured Logger instance.
    - File handler  → logs/app_YYYYMMDD.log   (DEBUG and above)
    - Stream handler → stdout                  (INFO and above)
    """
    os.makedirs("logs", exist_ok=True)

    logger = logging.getLogger(name)

    # Avoid adding duplicate handlers when the same name is requested again
    if logger.handlers:
        return logger

    logger.setLevel(logging.DEBUG)

    formatter = logging.Formatter(
        fmt="%(asctime)s | %(levelname)-8s | %(name)s | %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    # Daily log file
    log_file = os.path.join("logs", f"app_{datetime.now().strftime('%Y%m%d')}.log")
    file_handler = logging.FileHandler(log_file, encoding="utf-8")
    file_handler.setLevel(logging.DEBUG)
    file_handler.setFormatter(formatter)

    # Console output
    stream_handler = logging.StreamHandler()
    stream_handler.setLevel(logging.INFO)
    stream_handler.setFormatter(formatter)

    logger.addHandler(file_handler)
    logger.addHandler(stream_handler)

    return logger