using UnityEngine;
using System.Collections.Generic;
using UnityEngine.Audio;

public class SimpleAudioManager : MonoBehaviour
{
    public static SimpleAudioManager Instance { get; private set; }

    [Header("Settings")]
    [Tooltip("同时存在的最大声音数量")]
    public int poolSize = 32;
    public AudioMixerGroup sfxMixerGroup;
    public AudioMixerGroup musicMixerGroup;

    [Header("Music")]
    public AudioSource musicSource;

    // 简单的音效配置类 (实际项目中建议用 ScriptableObject 管理)
    [System.Serializable]
    public class SoundProfile
    {
        public string id;           // 音效ID (如 "Attack_Sword")
        public AudioClip clip;
        [Range(0f, 1f)] public float volume = 1f;
        [Range(0.1f, 3f)] public float pitch = 1f;
        [Range(0f, 0.5f)] public float randomPitch = 0.1f; // 音调随机范围 +/-
        public float cooldown = 0.1f; // 最小播放间隔 (秒)
        public bool is3D = false;     // 是否为 3D 音效
    }

    [Header("Library")]
    public List<SoundProfile> soundLibrary; // 在 Inspector 里配置所有音效

    // 运行时数据
    private Dictionary<string, SoundProfile> _libraryLookup;
    private Dictionary<string, float> _lastPlayedTimes;
    private List<AudioSource> _sourcePool;
    private int _poolIndex = 0;

    void Awake()
    {
        // 单例初始化
        if (Instance == null) { Instance = this; DontDestroyOnLoad(gameObject); }
        else { Destroy(gameObject); return; }

        InitializeLibrary();
        InitializePool();
    }

    private void InitializeLibrary()
    {
        _libraryLookup = new Dictionary<string, SoundProfile>();
        _lastPlayedTimes = new Dictionary<string, float>();

        foreach (var s in soundLibrary)
        {
            if (!_libraryLookup.ContainsKey(s.id))
            {
                _libraryLookup.Add(s.id, s);
                _lastPlayedTimes.Add(s.id, 0f);
            }
        }
    }

    private void InitializePool()
    {
        _sourcePool = new List<AudioSource>();
        GameObject poolRoot = new GameObject("SFX_Pool");
        poolRoot.transform.SetParent(transform);

        for (int i = 0; i < poolSize; i++)
        {
            GameObject obj = new GameObject($"SFX_Source_{i}");
            obj.transform.SetParent(poolRoot.transform);
            AudioSource src = obj.AddComponent<AudioSource>();
            src.playOnAwake = false;
            src.outputAudioMixerGroup = sfxMixerGroup;
            _sourcePool.Add(src);
        }
    }

    /// <summary>
    /// 播放音效的核心方法
    /// </summary>
    /// <param name="id">音效配置ID</param>
    /// <param name="position">世界坐标 (如果是 null 则为 2D 声音)</param>
    public void PlaySFX(string id, Vector3? position = null)
    {
        if (!_libraryLookup.TryGetValue(id, out SoundProfile profile))
        {
            Debug.LogWarning($"Audio: Sound ID '{id}' not found!");
            return;
        }

        // 1. 冷却检测 (Throttling)
        if (Time.time < _lastPlayedTimes[id] + profile.cooldown) return;
        _lastPlayedTimes[id] = Time.time;

        // 2. 获取对象池中的 Source
        AudioSource source = GetNextSource();

        // 3. 应用配置
        source.clip = profile.clip;
        
        // 随机化处理
        float finalPitch = profile.pitch + Random.Range(-profile.randomPitch, profile.randomPitch);
        // 防止 Pitch 变成负数或 0
        source.pitch = Mathf.Max(0.1f, finalPitch); 
        source.volume = profile.volume;

        // 4. 空间化处理
        if (position.HasValue && profile.is3D)
        {
            source.spatialBlend = 1f; // 3D
            source.transform.position = position.Value;
            // 简单的衰减设置
            source.minDistance = 1f;
            source.maxDistance = 20f;
        }
        else
        {
            source.spatialBlend = 0f; // 2D
        }

        // 5. 播放
        source.Play();
    }

    private AudioSource GetNextSource()
    {
        // 简单的循环覆盖策略 (Round Robin)
        // 如果池子满了，会强行切断最久远的那个声音
        AudioSource src = _sourcePool[_poolIndex];
        _poolIndex = (_poolIndex + 1) % poolSize;
        return src;
    }

    // 背景音乐淡入淡出 (简单版)
    public void PlayMusic(AudioClip clip, float fadeDuration = 1f)
    {
        if (musicSource.clip == clip) return;
        // 此处省略 Coroutine 淡入淡出逻辑，实际项目中建议加上 Tween
        musicSource.clip = clip;
        musicSource.Play();
    }
}

// 播放 UI 点击声 (2D)
SimpleAudioManager.Instance.PlaySFX("UI_Click");

// 播放怪物受击声 (3D，在怪物位置)
SimpleAudioManager.Instance.PlaySFX("Hit_Flesh", transform.position);

[CreateAssetMenu(menuName = "Audio/SoundData")]
public class SoundData : ScriptableObject {
    public string id;
    public AudioClip[] clips; // 支持多个素材随机
    // ... 其他参数
}