import { _decorator, AudioClip, AudioSource, Node, resources, director } from 'cc';

export class AudioManager {
    private static _instance: AudioManager = null;
    private _audioNode: Node = null;
    private _bgmAudioSource: AudioSource = null;  // 专门用于背景音乐
    private _sfxAudioSources: AudioSource[] = []; // 用于音效的多个AudioSource
    private _bgmVolume: number = 0.5;
    private _bgmClip: AudioClip = null;
    private _audioClips: Map<string, AudioClip> = new Map();
    private _isMuted: boolean = false;
    private _isPaused: boolean = false;

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

    init() {
        // 创建根节点
        this._audioNode = new Node('AudioManager');
        director.getScene().addChild(this._audioNode);

        // 创建BGM节点
        let bgmNode = new Node('BGM');
        this._audioNode.addChild(bgmNode);
        this._bgmAudioSource = bgmNode.addComponent(AudioSource);
        this._bgmAudioSource.playOnAwake = false;

        // 创建多个音效节点
        for (let i = 0; i < 3; i++) {
            let sfxNode = new Node(`SFX_${i}`);
            this._audioNode.addChild(sfxNode);
            let sfxAudioSource = sfxNode.addComponent(AudioSource);
            sfxAudioSource.playOnAwake = false;
            this._sfxAudioSources.push(sfxAudioSource);
        }

        // 加载音频资源
        this.loadAudioClips();
    }

    private loadAudioClips() {
        resources.loadDir("audio", AudioClip, (err, clips) => {
            if (err) {
                console.error("加载音频资源失败:", err);
                return;
            }
            clips.forEach(clip => {
                this._audioClips.set(clip.name, clip);
            });
        });
    }

    playBGM(name: string, loop: boolean = true) {
        if (this._isMuted || !this._bgmAudioSource) return;
        this._bgmAudioSource.stop();
        let clip = this._audioClips.get(name);
        if (!clip) {
            console.warn(`BGM ${name} 不存在`);
            return;
        }
        this._bgmClip = clip;
        this._bgmAudioSource.clip = clip;
        this._bgmAudioSource.loop = loop;
        this._bgmAudioSource.volume = this._bgmVolume;
        this._bgmAudioSource.play();
        this._isPaused = false;
    }

    playSFX(name: string, volume: number = 1.0, loop: boolean = false) {
        if (this._isMuted) return;

        let clip = this._audioClips.get(name);
        if (!clip) {
            console.warn(`音效 ${name} 不存在`);
            return;
        }

        // 找到一个空闲的AudioSource
        let availableSource = this._sfxAudioSources.find(source => !source.playing);
        if (availableSource) {
            // 确保音量正确
            availableSource.volume = volume;
            availableSource.loop = loop;
            availableSource.clip = clip;
            // 播放新音效
            availableSource.play()
        } else {
            // 如果没有空闲的AudioSource，创建一个新的
            let sfxNode = new Node(`SFX_${this._sfxAudioSources.length}`);
            this._audioNode.addChild(sfxNode);
            let newSource = sfxNode.addComponent(AudioSource);
            newSource.playOnAwake = false;
            newSource.volume = volume;
            newSource.loop = loop;
            newSource.clip = clip;
            this._sfxAudioSources.push(newSource);
            newSource.play()
        }
    }

    async stopAllSFX(): Promise<void> {
        let promises = this._sfxAudioSources.map(source => {
            return new Promise<void>((resolve) => {
                source.stop();
                // 使用 setTimeout 确保音效停止
                setTimeout(resolve, 100);
            });
        });

        await Promise.all(promises);
    }

    stopBGM() {
        if (this._bgmAudioSource) {
            this._bgmAudioSource.stop();
            this._isPaused = false;
        }
    }

    pauseBGM() {
        if (this._bgmAudioSource && !this._isPaused) {
            this._bgmAudioSource.pause();
            this._isPaused = true;
        }
    }

    resumeBGM() {
        if (!this._isMuted && this._bgmAudioSource && this._isPaused) {
            this._bgmAudioSource.play();
            this._isPaused = false;
        }
    }

    setBGMVolume(volume: number) {
        this._bgmVolume = Math.max(0, Math.min(1, volume));
        if (this._bgmAudioSource) {
            this._bgmAudioSource.volume = this._bgmVolume;
        }
    }

    setSFXVolume(volume: number) {
        // this._sfxVolume = Math.max(0, Math.min(1, volume));
        // this._sfxAudioSources.forEach(source => {
        //     source.volume = this._sfxVolume;
        // });
    }

    setMute(muted: boolean) {
        this._isMuted = muted;
        if (muted) {
            this.stopBGM();
        } else if (this._bgmClip) {
            this.playBGM(this._bgmClip.name);
        }
    }

    getMuted() {
        return this._isMuted;
    }

    // 清理资源
    destroy() {
        if (this._audioNode) {
            this._audioNode.destroy();
        }
        this._audioNode = null;
        this._bgmAudioSource = null;
        this._sfxAudioSources = [];
        this._audioClips.clear();
    }
}