"""Project level logger helper."""

from __future__ import annotations

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

from app.const import LOG_ROOT


class _Logger:
    def __init__(self) -> None:
        LOG_ROOT.mkdir(parents=True, exist_ok=True)
        log_path = LOG_ROOT / "qa_pair.log"
        self._logger = logging.getLogger("qa_pair")
        if not self._logger.handlers:
            self._logger.setLevel(logging.INFO)
            handler = RotatingFileHandler(log_path, maxBytes=5_000_000, backupCount=2, encoding="utf-8")
            formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
            handler.setFormatter(formatter)
            self._logger.addHandler(handler)
        self._level_map: Dict[str, int] = {
            "DEBUG": logging.DEBUG,
            "INFO": logging.INFO,
            "WARN": logging.WARNING,
            "ERROR": logging.ERROR,
        }

    def log(self, message: str, level: str = "INFO") -> None:
        lvl = self._level_map.get(level.upper(), logging.INFO)
        self._logger.log(lvl, message)


logger = _Logger()

__all__ = ["logger"]