import logging
import json
import sys
from contextvars import ContextVar
from datetime import datetime, timezone

request_id_var: ContextVar[str] = ContextVar("request_id", default="-")


class ReadableFormatter(logging.Formatter):
    def format(self, record: logging.LogRecord) -> str:
        # 将时间格式化为本地时间
        local_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
        request_id = request_id_var.get("-")
        message = record.getMessage()

        # 构建基础日志信息
        if record.levelname == "INFO":
            # INFO级别: [INFO] timestamp message (request_id)
            log_msg = f"[{record.levelname}] {local_time} {message}"
            if request_id != "-":
                log_msg += f" ({request_id})"
        else:
            # 非INFO级别: [LEVEL] timestamp message module function line (request_id)
            log_msg = f"[{record.levelname}] {local_time} {message} {record.module} {record.funcName} {record.lineno}"
            if request_id != "-":
                log_msg += f" ({request_id})"

        # 如果有异常信息，追加到日志后面
        if record.exc_info and record.exc_info[0] is not None:
            log_msg += "\n" + self.formatException(record.exc_info)

        return log_msg


def get_logger(name: str) -> logging.Logger:
    from core.config import settings

    logger = logging.getLogger(name)
    if not logger.handlers:
        handler = logging.StreamHandler(sys.stdout)
        handler.setFormatter(ReadableFormatter())
        logger.addHandler(handler)
        logger.setLevel(getattr(logging, settings.log_level, logging.INFO))
        logger.propagate = False
    return logger