import logging
import os
from logging.handlers import RotatingFileHandler

_LOG_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "logs")
os.makedirs(_LOG_DIR, exist_ok=True)

_FMT = "%(asctime)s [%(levelname)s] %(message)s"
_formatter = logging.Formatter(_FMT)

_MAX_BYTES = 5 * 1024 * 1024  # 5 MB per file
_BACKUP_COUNT = 3


def _rotating(filename, level):
    h = RotatingFileHandler(
        os.path.join(_LOG_DIR, filename),
        maxBytes=_MAX_BYTES,
        backupCount=_BACKUP_COUNT,
        encoding="utf-8",
    )
    h.setLevel(level)
    h.setFormatter(_formatter)
    return h


_console = logging.StreamHandler()
_console.setFormatter(_formatter)

logging.basicConfig(
    level=logging.INFO,
    handlers=[
        _rotating("app.log", logging.INFO),
        _rotating("error.log", logging.ERROR),
        _console,
    ],
)

logger = logging.getLogger("main")