"""Shared logging setup."""

import logging
from logging.handlers import RotatingFileHandler
from pathlib import Path

LOGGER_NAME = "dieya_risk_prediction"
LOG_DIR = Path(__file__).resolve().parents[2] / "logs"
LOG_FILE = LOG_DIR / "backend.log"
_FORMAT = "%(asctime)s %(levelname)s %(name)s %(message)s"


def configure_logging(level: str = "INFO") -> logging.Logger:
    logger = logging.getLogger(LOGGER_NAME)
    logger.setLevel(level.upper())
    logger.propagate = False
    LOG_DIR.mkdir(parents=True, exist_ok=True)
    formatter = logging.Formatter(_FORMAT)
    file_handler = next(
        (
            handler
            for handler in logger.handlers
            if getattr(handler, "_dieya_file_handler", False)
        ),
        None,
    )
    if file_handler is None:
        file_handler = RotatingFileHandler(
            LOG_FILE,
            maxBytes=10 * 1024 * 1024,
            backupCount=5,
            encoding="utf-8",
        )
        file_handler._dieya_file_handler = True
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)
    root_logger = logging.getLogger()
    root_logger.setLevel(level.upper())
    if not any(getattr(handler, "_dieya_file_handler", False) for handler in root_logger.handlers):
        root_file_handler = RotatingFileHandler(
            LOG_FILE,
            maxBytes=10 * 1024 * 1024,
            backupCount=5,
            encoding="utf-8",
        )
        root_file_handler._dieya_file_handler = True
        root_file_handler.setFormatter(formatter)
        root_logger.addHandler(root_file_handler)
    if not any(
        isinstance(handler, logging.StreamHandler)
        and not getattr(handler, "_dieya_file_handler", False)
        for handler in logger.handlers
    ):
        stream_handler = logging.StreamHandler()
        stream_handler.setFormatter(formatter)
        logger.addHandler(stream_handler)
    return logger


logger = configure_logging()