import { AudioClip, AudioSource, Node } from 'cc';

/**
 * 音效管理器
 * 统一管理全局按钮点击等通用音效，避免页面各自维护 AudioSource。
 */
export class AudioManager {
    private static _instance: AudioManager | null = null;

    private _clickAudio: AudioClip | null = null;
    private _hostNode: Node | null = null;
    private _audioSource: AudioSource | null = null;

    static get instance(): AudioManager {
        if (!this._instance) {
            this._instance = new AudioManager();
        }
        return this._instance;
    }

    private constructor() {}

    init(clickAudio: AudioClip | null, hostNode: Node | null): void {
        this._clickAudio = clickAudio;
        this._hostNode = hostNode;
        this._audioSource = null;
    }

    playButtonClick(): void {
        this._playOneShot(this._clickAudio);
    }

    private _playOneShot(clip: AudioClip | null): void {
        if (!clip) {
            return;
        }

        const audioSource = this._ensureAudioSource();
        audioSource?.playOneShot(clip);
    }

    private _ensureAudioSource(): AudioSource | null {
        if (this._audioSource?.isValid) {
            return this._audioSource;
        }

        if (!this._hostNode?.isValid) {
            console.warn('[AudioManager] 未初始化宿主节点，无法播放音效');
            return null;
        }

        this._audioSource = this._hostNode.getComponent(AudioSource) ?? this._hostNode.addComponent(AudioSource);
        return this._audioSource;
    }
}