import time
import threading
import sys

class Timer:
    def __init__(self):
        self.total_seconds = 0
        self.remaining_seconds = 0
        self.is_running = False
        self.is_paused = False
        self.thread = None

    def set_timer(self, minutes, seconds):
        """设置倒计时时间"""
        self.total_seconds = minutes * 60 + seconds
        self.remaining_seconds = self.total_seconds
        print(f"计时器设置为 {minutes} 分 {seconds} 秒")

    def start(self):
        """开始倒计时"""
        if self.total_seconds <= 0:
            print("请先设置计时器时间！")
            return

        if self.is_running and not self.is_paused:
            print("计时器已经在运行中！")
            return

        self.is_running = True
        self.is_paused = False

        if self.thread is None or not self.thread.is_alive():
            self.thread = threading.Thread(target=self._countdown)
            self.thread.daemon = True
            self.thread.start()
            print("计时器开始！")

    def pause(self):
        """暂停计时器"""
        if not self.is_running:
            print("计时器未运行！")
            return

        if self.is_paused:
            print("计时器已经暂停！")
            return

        self.is_paused = True
        print("计时器已暂停")

    def resume(self):
        """继续计时器"""
        if not self.is_running:
            print("计时器未运行！")
            return

        if not self.is_paused:
            print("计时器未暂停！")
            return

        self.is_paused = False
        print("计时器继续")

    def reset(self):
        """重置计时器"""
        self.is_running = False
        self.is_paused = False
        self.remaining_seconds = self.total_seconds
        print("计时器已重置")

    def _countdown(self):
        """倒计时线程函数"""
        while self.remaining_seconds > 0 and self.is_running:
            if not self.is_paused:
                mins, secs = divmod(self.remaining_seconds, 60)
                time_format = f"{mins:02d}:{secs:02d}"
                sys.stdout.write(f"\r剩余时间: {time_format}")
                sys.stdout.flush()
                time.sleep(1)
                self.remaining_seconds -= 1

        if self.remaining_seconds <= 0 and self.is_running:
            print("\n时间到！计时器结束！")
            self.is_running = False
        else:
            print("\n计时器已停止")

    def get_status(self):
        """获取计时器状态"""
        if self.is_running:
            if self.is_paused:
                status = "已暂停"
            else:
                status = "运行中"
        else:
            status = "未运行"

        mins, secs = divmod(self.remaining_seconds, 60)
        time_format = f"{mins:02d}:{secs:02d}"
        return f"状态: {status}, 剩余时间: {time_format}"


def main():
    """主函数，提供命令行交互界面"""
    timer = Timer()

    print("=== Python 计时器 ===")
    print("命令列表:")
    print("  set <分钟> <秒> - 设置计时器时间")
    print("  start           - 开始计时器")
    print("  pause           - 暂停计时器")
    print("  resume          - 继续计时器")
    print("  reset           - 重置计时器")
    print("  status          - 查看状态")
    print("  help            - 显示帮助")
    print("  quit            - 退出程序")
    print()

    while True:
        try:
            command = input(">>> ").strip().lower().split()

            if not command:
                continue

            cmd = command[0]

            if cmd == "set":
                if len(command) != 3:
                    print("用法: set <分钟> <秒>")
                    continue
                try:
                    minutes = int(command[1])
                    seconds = int(command[2])
                    if minutes < 0 or seconds < 0:
                        print("时间不能为负数！")
                        continue
                    timer.set_timer(minutes, seconds)
                except ValueError:
                    print("请输入有效的数字！")

            elif cmd == "start":
                timer.start()

            elif cmd == "pause":
                timer.pause()

            elif cmd == "resume":
                timer.resume()

            elif cmd == "reset":
                timer.reset()

            elif cmd == "status":
                print(timer.get_status())

            elif cmd == "help":
                print("命令列表:")
                print("  set <分钟> <秒> - 设置计时器时间")
                print("  start           - 开始计时器")
                print("  pause           - 暂停计时器")
                print("  resume          - 继续计时器")
                print("  reset           - 重置计时器")
                print("  status          - 查看状态")
                print("  help            - 显示帮助")
                print("  quit            - 退出程序")

            elif cmd == "quit":
                print("退出计时器程序")
                break

            else:
                print(f"未知命令: {cmd}，输入 'help' 查看帮助")

        except KeyboardInterrupt:
            print("\n程序被中断")
            break
        except Exception as e:
            print(f"发生错误: {e}")


if __name__ == "__main__":
    main()