using UnityEngine;

/// <summary>
/// 背景音乐控制器——挂在 [Managers] 上，独立于 PageController。
/// 静态方法供外部调用。
/// </summary>
public class BGMController : MonoBehaviour
{
    [SerializeField] private AudioClip _homeBgClip;
    [SerializeField] private AudioClip _experimentBgClip;
    private AudioSource _bgSource;

    private static BGMController _instance;

    void Awake()
    {
        _instance = this;
        _bgSource = gameObject.AddComponent<AudioSource>();
        _bgSource.loop = true;
        _bgSource.playOnAwake = false;
        _bgSource.spatialBlend = 0f;
        _bgSource.volume = 0.5f;

#if UNITY_EDITOR
        if (_homeBgClip == null) _homeBgClip = UnityEditor.AssetDatabase.LoadAssetAtPath<AudioClip>("Assets/Audio/homeBackgroundMusic.mp3");
        if (_experimentBgClip == null) _experimentBgClip = UnityEditor.AssetDatabase.LoadAssetAtPath<AudioClip>("Assets/Audio/backgroundMusic.mp3");
#endif
        Debug.Log($"[BGMController] 就绪 homeBg={(_homeBgClip!=null)} expBg={(_experimentBgClip!=null)}");
    }

    public static void PlayHomeBg()
    {
        if (_instance == null || _instance._homeBgClip == null) { Debug.LogWarning("[BGMController] PlayHomeBg 失败"); return; }
        _instance._bgSource.clip = _instance._homeBgClip;
        _instance._bgSource.volume = 0.5f;
        _instance._bgSource.Play();
        Debug.Log($"[BGMController] 播放首页bg isPlaying={_instance._bgSource.isPlaying}");
    }

    public static void PlayExperimentBg()
    {
        if (_instance == null || _instance._experimentBgClip == null) { Debug.LogWarning("[BGMController] PlayExperimentBg 失败"); return; }
        _instance._bgSource.clip = _instance._experimentBgClip;
        _instance._bgSource.volume = 0.5f;
        _instance._bgSource.Play();
        Debug.Log($"[BGMController] 播放实验bg isPlaying={_instance._bgSource.isPlaying}");
    }

    public static void StopBgMusic()
    {
        if (_instance != null) _instance._bgSource.Stop();
        Debug.Log("[BGMController] 停止bg");
    }
}