"""
loguru 统一日志配置 + InterceptHandler 拦截标准库 logging。

日志约定：
- INFO：面向运维的稳定摘要，避免敏感字段与高频噪音。
- DEBUG：可记录完整上下文、用户内容、连接串、URL 等敏感信息；仅用于受控环境排查，
  生产环境勿长期开启 DEBUG。

由 ``Settings.log_level`` 控制（环境变量 ``LOG_LEVEL``，默认 ``INFO``）；
设为 ``DEBUG`` 时上述详细日志才会输出。
"""

import logging
import sys

from loguru import logger

from app.core.config import settings


def _sink_min_level() -> str:
    raw = (settings.log_level or "INFO").strip().upper()
    if raw in ("TRACE", "DEBUG", "INFO", "SUCCESS", "WARNING", "ERROR", "CRITICAL"):
        return raw
    return "INFO"


class InterceptHandler(logging.Handler):
    """Route standard-library logging messages into loguru."""

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

        frame, depth = logging.currentframe(), 2
        while frame and frame.f_code.co_filename == logging.__file__:
            frame = frame.f_back
            depth += 1

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


def setup_logging() -> None:
    """Call once at process entry (API：`main`；Worker：`celery_app` 在首行调用)。

    Celery 需在 `app.tasks.celery_app` 中设置 `worker_hijack_root_logger=False`，否则
    会覆盖根 logger，无法与下方 InterceptHandler + loguru 格式对齐。
    """
    logger.remove()

    logger.add(
        sys.stderr,
        level=_sink_min_level(),
        format=(
            "<green>{time:YYYY-MM-DD HH:mm:ss.SSS}</green> | "
            "<level>{level.name: <8}</level> | "
            "<cyan>{name}</cyan>:<cyan>{function}</cyan>:<cyan>{line}</cyan> | "
            "{extra[request_id]} | "
            "<level>{message}</level>"
        ),
        backtrace=True,
        diagnose=False,
    )

    # 将根 logger 重定向到 loguru，不再使用 basicConfig（文档要求：统一走 loguru）
    root = logging.getLogger()
    root.handlers = [InterceptHandler()]
    root.setLevel(0)

    for name in (
        "uvicorn",
        "uvicorn.error",
        "uvicorn.access",
        "sqlalchemy.engine",
        "celery",
        "celery.worker",
    ):
        logging.getLogger(name).handlers = [InterceptHandler()]

    logger.configure(extra={"request_id": "-"})


def get_logger(name: str) -> logging.Logger:
    """获取具名 logger，统一走 loguru 拦截。各模块应使用此函数而非直接 import logging。"""
    return logging.getLogger(name)