"""tg_bridge 日志：控制台 + 按日切分的本地文件（午夜滚动，历史文件带日期后缀）。"""

from __future__ import annotations

import logging
import logging.handlers
import os
from pathlib import Path

from dotenv import load_dotenv

_ROOT = Path(__file__).resolve().parent.parent
load_dotenv(_ROOT / ".env")
load_dotenv()


def _parse_log_level(name: str) -> int:
    return getattr(logging, name.upper(), logging.INFO)


def setup_logging() -> None:
    """为 logger ``tg_bridge`` 及其子 logger 配置 StreamHandler + TimedRotatingFileHandler。

    当前日志文件：``<目录>/tg_bridge.log``；每日午夜滚动后重命名为 ``tg_bridge.log.YYYY-MM-DD``。
    重复调用不会重复添加 handler。
    """
    root_tg = logging.getLogger("tg_bridge")
    if root_tg.handlers:
        return

    log_dir_raw = os.environ.get("BRIDGE_LOG_DIR", "").strip()
    log_dir = Path(log_dir_raw).expanduser().resolve() if log_dir_raw else (_ROOT / "logs").resolve()
    log_dir.mkdir(parents=True, exist_ok=True)

    backup_raw = os.environ.get("BRIDGE_LOG_BACKUP_COUNT", "30").strip()
    try:
        backup_count = max(1, int(backup_raw))
    except ValueError:
        backup_count = 30

    level = _parse_log_level(os.environ.get("BRIDGE_LOG_LEVEL", "INFO"))
    root_tg.setLevel(level)

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

    file_path = log_dir / "tg_bridge.log"
    fh = logging.handlers.TimedRotatingFileHandler(
        filename=str(file_path),
        when="midnight",
        interval=1,
        backupCount=backup_count,
        encoding="utf-8",
        delay=True,
    )
    fh.suffix = "%Y-%m-%d"
    fh.setFormatter(fmt)

    sh = logging.StreamHandler()
    sh.setFormatter(fmt)

    root_tg.addHandler(fh)
    root_tg.addHandler(sh)
    root_tg.propagate = False