using System.Collections;
using UnityEngine;
using UnityEngine.Video;

public class UIVideoTexture : MonoBehaviour
{
    //视频状态
    private enum VideoPlayState
    {
        None,
        Playing,
        Pause,
        Stop
    }
    //当前视频状态
    private VideoPlayState _videoPlayState = VideoPlayState.None;
    //UITexture 组件
    private UITexture _uiTexture = null;
    //VideoPlayer 组件
    private VideoPlayer _videoPlayer = null;
    //声音源
    private AudioSource _audioSource = null;
    //RenderTexture
    private RenderTexture _rTex = null;
    //是否初始化
    public bool _isInit = false;
    //是否循环
    private bool _isLooping = false;
    //自动播放
    private bool _playOnAwake = false;
    //总帧数
    private int _frameCount = 0;
    //帧率
    private float _frameRate = 0;
    //开始播放时间
    private float _beginTime = 0;

    public VideoPlayer VideoPlayer
    {
        get
        {
            return _videoPlayer;
        }
    }

    public UITexture UITexture
    {
        get
        {
            return _uiTexture;
        }
    }

    //是否循环
    public bool IsLooping
    {
        get
        {
            return _isLooping;
        }
        set
        {
            if (_videoPlayer != null)
            {
                _videoPlayer.isLooping = value;
            }
            _isLooping = value;
        }
    }

    //自动播放
    public bool PlayOnAwake
    {
        get
        {
            return _playOnAwake;
        }
        set
        {
            if (_videoPlayer != null)
            {
                _videoPlayer.playOnAwake = value;
            }
            _playOnAwake = value;
        }
    }
    //当前帧
    public int Frame
    {
        get
        {
            if (VideoPlayer != null)
            {
                return (int)VideoPlayer.frame;
            }
            return 0;
        }
    }
    //总帧数
    public int FrameCount
    {
        get
        {
            return _frameCount;
        }
    }
    //帧率
    public float FrameRate
    {
        get
        {
            return _frameRate;
        }
    }

    public void Init()
    {
        if (_isInit)
            return;
        _uiTexture = GetComponent<UITexture>();
        if (_uiTexture == null)
        {
            _uiTexture = gameObject.AddComponent<UITexture>();
        }

        _videoPlayer = GetComponent<VideoPlayer>();
        if (_videoPlayer == null)
        {
            _videoPlayer = gameObject.AddComponent<VideoPlayer>();
        }

        _audioSource = GetComponent<AudioSource>();
        if (_audioSource == null)
        {
            _audioSource = gameObject.AddComponent<AudioSource>();
        }
        //要置空，不置空可能会没声音
        _videoPlayer.clip = null;
        _videoPlayer.renderMode = VideoRenderMode.RenderTexture;
        _videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;
        _videoPlayer.playOnAwake = _playOnAwake;
        _videoPlayer.isLooping = _isLooping;

        _videoPlayer.SetTargetAudioSource(0, _audioSource);
        _videoPlayer.controlledAudioTrackCount = 1;
        _isInit = true;
    }

    public void Play(string url, float time = 0)
    {
        Init();
        if(url != _videoPlayer.url)
        {
            _videoPlayer.source = VideoSource.Url;
            _videoPlayer.url = url;
        }
        Play(time);
    }

    //播放
    public void Play(VideoClip videoClip, float time = 0)
    {
        Init();
        if (videoClip != _videoPlayer.clip)
        {
            _videoPlayer.source = VideoSource.VideoClip;
            _videoPlayer.clip = videoClip;
        }
        Play(time);
    }

    //播放
    public void Play()
    {
        _videoPlayState = VideoPlayState.Playing;
        if (_videoPlayer != null)
        {
            if (_videoPlayer.isPlaying)
            {
                _videoPlayer.time = _beginTime;
            }
            else if (_videoPlayer.isPrepared)
            {
                _videoPlayer.time = _beginTime;
                _videoPlayer.Play();
            }
            else
            {
                _videoPlayer.Prepare();
                StartCoroutine(PlayVideo());
            }
        }
    }

    //播放
    public void Play(float time)
    {
        Goto(time);
        Play();
    }

    private IEnumerator PlayVideo()
    {
        while (!_videoPlayer.isPrepared)
        {
            yield return new WaitForEndOfFrame();
        }
        _frameCount = (int)_videoPlayer.frameCount;
        _frameRate = _videoPlayer.frameRate;
        if (_rTex == null || _rTex.width != _uiTexture.width || _rTex.height != _uiTexture.height)
        {
            if (_rTex != null)
                RenderTexture.ReleaseTemporary(_rTex);
            _rTex = RenderTexture.GetTemporary((int)_videoPlayer.clip.width, (int)_videoPlayer.clip.height, 0, RenderTextureFormat.ARGB32);
            _rTex.name = "RenderTexture7";
            _rTex.antiAliasing = 1;
            _uiTexture.mainTexture = _rTex;
            _videoPlayer.targetTexture = _rTex;
        }
        //准备完成
        if (_videoPlayState == VideoPlayState.Playing)
        {
            _videoPlayer.time = _beginTime;
            _videoPlayer.Play();
        }
    }

    //调到xx时间播放
    public void Goto(float time)
    {
        int targetFram = (int)(_frameRate * time);
        if (targetFram <= _frameCount)
        {
            _beginTime = time;
        }
        else
        {
            _beginTime = (float)_frameCount / _frameRate;
        }
    }

    //停止
    public bool Stop()
    {
        _videoPlayState = VideoPlayState.Stop;
        if (_videoPlayer != null && _videoPlayer.isPlaying)
        {
            _videoPlayer.Stop();
            return true;
        }
        return false;
    }

    //暂停
    public bool Pause()
    {
        _videoPlayState = VideoPlayState.Pause;
        if (_videoPlayer != null && _videoPlayer.isPlaying)
        {
            _videoPlayer.Pause();
            return true;
        }
        return false;
    }

    //重播
    public bool Replay()
    {
        _videoPlayState = VideoPlayState.Playing;
        if (_videoPlayer != null)
        {
            _videoPlayer.Stop();
            Play(0);
            return true;
        }
        return false;
    }
}