"""日志配置：使用 loguru 替代标准 logging，统一管理日志输出

- 控制台输出：始终启用
- 文件输出：生产环境默认启用，支持日志轮转、压缩和保留策略
- 拦截标准 logging：将 uvicorn 等第三方库的日志转发到 loguru
"""
from __future__ import annotations

import logging
import sys
from pathlib import Path
from types import FrameType

from loguru import logger as loguru_logger

from app.core.config import Settings


class InterceptHandler(logging.Handler):
    """拦截标准 logging 日志，转发到 loguru"""

    def emit(self, record: logging.LogRecord) -> None:
        try:
            level: str | int = loguru_logger.level(record.levelname).name
        except ValueError:
            level = record.levelno

        frame: FrameType | None = logging.currentframe()
        depth = 2
        while frame and frame.f_code.co_filename == logging.__file__:
            frame = frame.f_back
            depth += 1

        loguru_logger.opt(depth=depth, exception=record.exc_info).log(level, record.getMessage())


def configure_logging(settings: Settings) -> None:
    """根据配置初始化日志系统

    - 移除 loguru 默认 handler
    - 添加控制台输出
    - 生产环境添加文件输出（轮转、压缩、保留策略）
    - 拦截标准 logging，统一走 loguru 输出
    """
    loguru_logger.remove()
    loguru_logger.add(
        sys.stdout,
        level=settings.log_level.upper(),
        format=settings.log_format,
        enqueue=settings.log_enqueue,
        backtrace=False,
        diagnose=False,
    )

    if settings.log_to_file_effective:
        log_dir = Path(settings.log_dir)
        log_dir.mkdir(parents=True, exist_ok=True)
        log_path = log_dir / f"app_{settings.app_env}.log"
        loguru_logger.add(
            str(log_path),
            level=settings.log_level.upper(),
            format=settings.log_format,
            rotation=settings.log_rotation,
            retention=settings.log_retention,
            compression=settings.log_compression,
            enqueue=settings.log_enqueue,
            encoding="utf-8",
            backtrace=False,
            diagnose=False,
        )

    intercept = InterceptHandler()
    logging.basicConfig(handlers=[intercept], level=getattr(logging, settings.log_level.upper(), logging.INFO), force=True)

    # 将 uvicorn 的日志也转发到 loguru
    for name in ("uvicorn", "uvicorn.error", "uvicorn.access"):
        logger = logging.getLogger(name)
        logger.handlers = [intercept]
        logger.propagate = False

    # 降低 asyncio 的日志级别，避免过多输出
    logging.getLogger("asyncio").setLevel(logging.WARNING)