/**
 * 智能音箱类
 * 实现了SmartDevice, PowerControl和AudioControl接口
 */
public class SmartSpeaker implements SmartDevice, PowerControl, AudioControl {
    private String deviceId;
    private String deviceName;
    private boolean isPowerOn;
    private int volume;
    private boolean isPlaying;
    
    /**
     * 构造函数
     * @param deviceId 设备ID
     * @param deviceName 设备名称
     */
    public SmartSpeaker(String deviceId, String deviceName) {
        this.deviceId = deviceId;
        this.deviceName = deviceName;
        this.isPowerOn = false;
        this.volume = 30; // 默认音量30%
        this.isPlaying = false;
    }
    
    @Override
    public String getDeviceId() {
        return deviceId;
    }
    
    @Override
    public String getDeviceName() {
        return deviceName;
    }
    
    @Override
    public String getDeviceType() {
        return "Speaker";
    }
    
    @Override
    public String getStatusDescription() {
        return deviceName + " (ID: " + deviceId + ") - 状态: " + 
               (isPowerOn ? "开启" : "关闭") + ", 音量: " + volume + "%, " + 
               (isPlaying ? "正在播放" : "未播放");
    }
    
    @Override
    public void turnOn() {
        if (!isPowerOn) {
            isPowerOn = true;
            System.out.println(deviceName + " 已开启");
        } else {
            System.out.println(deviceName + " 已经是开启状态");
        }
    }
    
    @Override
    public void turnOff() {
        if (isPowerOn) {
            isPowerOn = false;
            isPlaying = false; // 关闭电源时停止播放
            System.out.println(deviceName + " 已关闭");
        } else {
            System.out.println(deviceName + " 已经是关闭状态");
        }
    }
    
    @Override
    public boolean isPowerOn() {
        return isPowerOn;
    }
    
    @Override
    public void playAudio() {
        if (isPowerOn) {
            isPlaying = true;
            System.out.println(deviceName + " 开始播放音频");
        } else {
            System.out.println(deviceName + " 未开启电源，无法播放音频");
        }
    }
    
    @Override
    public void pauseAudio() {
        if (isPowerOn && isPlaying) {
            isPlaying = false;
            System.out.println(deviceName + " 暂停播放音频");
        } else {
            System.out.println(deviceName + " 未播放音频，无法暂停");
        }
    }
    
    @Override
    public void stopAudio() {
        if (isPowerOn && isPlaying) {
            isPlaying = false;
            System.out.println(deviceName + " 停止播放音频");
        } else {
            System.out.println(deviceName + " 未播放音频，无法停止");
        }
    }
    
    @Override
    public void setVolume(int volume) {
        if (volume >= 0 && volume <= 100) {
            this.volume = volume;
            System.out.println(deviceName + " 音量已设置为: " + volume + "%");
        } else {
            System.out.println(deviceName + " 音量必须在 0-100% 之间");
        }
    }
    
    @Override
    public int getVolume() {
        return volume;
    }
}