using System;
using Cysharp.Threading.Tasks;
using UnityEngine;
using Object = UnityEngine.Object;

namespace Stary.Evo.AudioCore
{
    public class MusicPlayer : AbstractAudio, IDisposable
    {
        private GameObject poolObject;
        private AudioSource audioSource1;
        private AudioSource audioSource2;
        private AudioSource currentAudioSource;
        private Coroutine myCoroutine;

        public MusicPlayer(IResources resources) : base(resources)
        {
            poolObject = GameObject.Find(GetType().Name);
            if (poolObject == null)
            {
                // 如果不存在，创建一个新对象
                poolObject = new GameObject(GetType().Name);
            }

            CreatAudioSource("audioSource1", out audioSource1);
            CreatAudioSource("audioSource2", out audioSource2);
        }

        /// <summary>
        /// 播放背景音乐
        /// </summary>
        /// <param name="audioData">{[clip:音频], [volume:音量], [fadeDuration:自然过渡时间],
        /// [is3DAudio:是否3D音频], [audio3DPosition:3D音频位置], [audio3DMaxDistance:3D音频最大距离]}</param>
        public override async void Play(AudioData audioData)
        {
            if (Resources == null)
            {
                Debug.LogError("AudioCoreManager: Resources is null, please initialize it first.");
                return;
            }

            audioData = Initialize(audioData);

            if (!string.IsNullOrEmpty(audioData.packageName) && !string.IsNullOrEmpty(audioData.assetName))
            {
                var clip = await Resources.LoadAssetAsync<AudioClip>(audioData.packageName, audioData.assetName);
                if (clip == null)
                {
                    Debug.LogErrorFormat($"从资源包【{audioData.packageName}】加载音频片段【{audioData.assetName}】失败");
                }
                else
                {
                    audioData.clip = clip;
                }
            }

            if (audioData.clip == null)
            {
                Debug.LogError("播放的音效音频片段为空");
                return;
            }

            if (audioSource1 != null && audioSource1.isPlaying == false)
            {
                audioSource1.clip = audioData.clip;
                audioSource1.volume = audioData.volume;
                audioSource1.loop = true;

                // 设置2D与3D音频
                if (audioData.is3DAudio)
                {
                    audioSource1.transform.position = audioData.audio3DPosition;
                    audioSource1.spatialBlend = 1;
                    audioSource1.minDistance = 1f;
                    if (audioData.audio3DMaxDistance != 0)
                    {
                        audioSource1.maxDistance = audioData.audio3DMaxDistance;
                    }
                    else
                    {
                        // 默认3D最大距离为3米
                        audioSource1.maxDistance = 3f;
                    }
                }
                else
                {
                    audioSource1.transform.position = Vector3.zero;
                    audioSource1.spatialBlend = 0;
                    audioSource1.minDistance = 1f;
                    audioSource1.maxDistance = 500f;
                }

                currentAudioSource = audioSource1;
                currentAudioSource.Play();
                FadeMusic(audioSource1, audioData.fadeDuration, audioSource2);
            }
            else if (audioSource2 != null && audioSource2.isPlaying == false)
            {
                audioSource2.clip = audioData.clip;
                audioSource2.volume = audioData.volume;
                audioSource2.loop = true;

                // 设置2D与3D音频
                if (audioData.is3DAudio)
                {
                    audioSource2.transform.position = audioData.audio3DPosition;
                    audioSource2.spatialBlend = 1;
                    audioSource2.minDistance = 1f;
                    if (audioData.audio3DMaxDistance != 0)
                    {
                        audioSource2.maxDistance = audioData.audio3DMaxDistance;
                    }
                    else
                    {
                        // 默认3D最大距离为3米
                        audioSource2.maxDistance = 3f;
                    }
                }
                else
                {
                    audioSource2.transform.position = Vector3.zero;
                    audioSource2.spatialBlend = 0;
                    audioSource2.minDistance = 1f;
                    audioSource2.maxDistance = 500f;
                }

                currentAudioSource = audioSource2;
                currentAudioSource.Play();
                FadeMusic(audioSource2, audioData.fadeDuration, audioSource1);
            }
            else
            {
                Debug.LogWarning("UnityEvo:已同时存在两个背景乐在切换");
            }
        }

        public override UniTask PlayAsync(AudioData audioData)
        {
            return UniTask.CompletedTask;
        }

        public override void StopAll()
        {
            FadeAllMusic(0);
        }

        public override AudioSource GetAudioSource()
        {
            return currentAudioSource;
        }

        /// <summary>
        /// 关闭背景音乐
        /// </summary>
        /// <param name="audioData">{[fadeDuration:自然过渡时间]}</param>
        public override void Stop()
        {
            FadeAllMusic(0f);
        }


        /// <summary>
        /// 设置自然过渡到指定音量
        /// </summary>
        /// <param name="fadeDuration"></param>
        /// <param name="targetVolume"></param>
        /// <returns></returns>
        public async UniTask SetMusicVolume(float fadeDuration, float targetVolume)
        {
            float startVolume = currentAudioSource.volume;
            while (!Mathf.Approximately(currentAudioSource.volume, targetVolume))
            {
                if (currentAudioSource.volume > targetVolume)
                {
                    currentAudioSource.volume -= (startVolume - targetVolume) * Time.deltaTime / fadeDuration;
                }
                else
                {
                    currentAudioSource.volume += (targetVolume - startVolume) * Time.deltaTime / fadeDuration;
                }

                if (Mathf.Abs(currentAudioSource.volume - targetVolume) < 0.01f)
                {
                    currentAudioSource.volume = targetVolume;
                }

                await UniTask.Yield();
            }
        }

        /// <summary>
        /// 切换音频
        /// </summary>
        /// <param name="source1">播放的音频</param>
        /// <param name="fadeDuration">变化时间</param>
        /// <param name="source2">停止的音频</param>
        /// <returns></returns>
        private void FadeMusic(AudioSource source1, float fadeDuration, AudioSource source2 = null)
        {
            FadeInMusic(source1, fadeDuration);
            FadeOutMusic(source2, fadeDuration);
        }

        public void FadeAllMusic(float fadeDuration)
        {
            currentAudioSource = null;
            FadeOutMusic(audioSource1, fadeDuration);
            FadeOutMusic(audioSource2, fadeDuration);
        }

        /// <summary>
        /// 创建一个新的AudioSource对象
        /// </summary>
        /// <param name="obj"></param>
        private void CreatAudioSource(string name, out AudioSource source)
        {
            source = new GameObject(name).AddComponent<AudioSource>();
            source.gameObject.transform.SetParent(poolObject.transform);
            source.transform.SetParent(poolObject.transform); // 将新对象作为当前对象的子对象
            source.playOnAwake = false; // 添加 AudioSource 组件并禁用自动播放
        }

        public void Dispose()
        {
            FadeAllMusic(0f);
            Object.Destroy(audioSource1.gameObject);
            Object.Destroy(audioSource2.gameObject);
            audioSource1 = null;
            audioSource2 = null;
        }
    }
}