import logging
import os
from logging.handlers import RotatingFileHandler, TimedRotatingFileHandler
from typing import Union


class Logger:
    """
    日志工具类封装

    功能：
    1. 支持控制台和文件两种输出方式
    2. 支持按大小或时间轮转日志文件
    3. 支持自定义日志格式
    4. 支持不同日志级别
    5. 线程安全
    """

    def __init__(
            self,
            name: str = "root",
            level: Union[int, str] = logging.INFO,
            console: bool = True,
            file: bool = False,
            file_path: str = "logs/app.log",
            max_bytes: int = 10 * 1024 * 1024,  # 10MB
            backup_count: int = 5,
            when: str = "midnight",
            interval: int = 1,
            fmt: str = "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
            datefmt: str = "%Y-%m-%d %H:%M:%S",
            mode: str = "size"  # 'size' 或 'time'
    ):
        """
        初始化日志工具

        :param name: 日志名称
        :param level: 日志级别
        :param console: 是否输出到控制台
        :param file: 是否输出到文件
        :param file_path: 日志文件路径
        :param max_bytes: 每个日志文件的最大大小(字节)，仅mode='size'时有效
        :param backup_count: 保留的备份日志文件数量
        :param when: 日志轮转时间单位，如'S'(秒)、'M'(分)、'H'(小时)、'D'(天)、'midnight'(午夜)，仅mode='time'时有效
        :param interval: 轮转间隔，仅mode='time'时有效
        :param fmt: 日志格式
        :param datefmt: 日期格式
        :param mode: 日志轮转模式，'size'按大小轮转，'time'按时间轮转
        """
        self.logger = logging.getLogger(name)
        self.logger.setLevel(level)

        # 避免重复添加handler
        if self.logger.handlers:
            return

        formatter = logging.Formatter(fmt=fmt, datefmt=datefmt)

        # 控制台输出
        if console:
            console_handler = logging.StreamHandler()
            console_handler.setFormatter(formatter)
            self.logger.addHandler(console_handler)

        # 文件输出
        if file:
            # 创建日志目录
            log_dir = os.path.dirname(file_path)
            if log_dir and not os.path.exists(log_dir):
                os.makedirs(log_dir)

            if mode == "size":
                # 按大小轮转
                file_handler = RotatingFileHandler(
                    filename=file_path,
                    maxBytes=max_bytes,
                    backupCount=backup_count,
                    encoding="utf-8"
                )
            else:
                # 按时间轮转
                file_handler = TimedRotatingFileHandler(
                    filename=file_path,
                    when=when,
                    interval=interval,
                    backupCount=backup_count,
                    encoding="utf-8"
                )

            file_handler.setFormatter(formatter)
            self.logger.addHandler(file_handler)

    def debug(self, msg: str, *args, **kwargs):
        """记录调试信息"""
        self.logger.debug(msg, *args, **kwargs)

    def info(self, msg: str, *args, **kwargs):
        """记录普通信息"""
        self.logger.info(msg, *args, **kwargs)

    def warning(self, msg: str, *args, **kwargs):
        """记录警告信息"""
        self.logger.warning(msg, *args, **kwargs)

    def error(self, msg: str, *args, **kwargs):
        """记录错误信息"""
        self.logger.error(msg, *args, **kwargs)

    def critical(self, msg: str, *args, **kwargs):
        """记录严重错误信息"""
        self.logger.critical(msg, *args, **kwargs)

    def exception(self, msg: str, *args, exc_info=True, **kwargs):
        """记录异常信息"""
        self.logger.exception(msg, *args, exc_info=exc_info, **kwargs)

    def log(self, level: int, msg: str, *args, **kwargs):
        """通用日志记录方法"""
        self.logger.log(level, msg, *args, **kwargs)

    def set_level(self, level: Union[int, str]):
        """设置日志级别"""
        self.logger.setLevel(level)

    def add_handler(self, handler: logging.Handler):
        """添加自定义handler"""
        self.logger.addHandler(handler)

    def remove_handler(self, handler: logging.Handler):
        """移除handler"""
        self.logger.removeHandler(handler)


logger: Logger


def app_logger() -> Logger:
    return logger


def init() -> Logger:
    # 创建日志实例
    global logger
    logger = Logger(
        name="my_app",
        level=logging.DEBUG,
        console=True,
        file=True,
        file_path="logs/app.log",
        max_bytes=1024 * 1024,  # 1MB
        backup_count=3,
        mode="size"
    )
    return logger