using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;

/// <summary>
/// 画中画视频控制器：用 VideoPlayer 渲染到 RenderTexture，再赋给 RawImage。
/// 挂在包含 RawImage 和 VideoPlayer 的 GameObject 上。
/// </summary>
[RequireComponent(typeof(RawImage))]
public class VideoController : MonoBehaviour
{
    [SerializeField] private VideoPlayer _videoPlayer;
    [SerializeField] private RawImage _rawImage;

    private RenderTexture _renderTexture;
    private bool _isPlaying;

    private void Awake()
    {
        if (_rawImage == null) _rawImage = GetComponent<RawImage>();
        if (_rawImage == null) _rawImage = gameObject.AddComponent<RawImage>();
        
        if (_videoPlayer == null) _videoPlayer = GetComponentInChildren<VideoPlayer>();
        if (_videoPlayer == null) _videoPlayer = gameObject.AddComponent<VideoPlayer>();

        if (_videoPlayer != null)
        {
            _videoPlayer.source = VideoSource.Url;
            _videoPlayer.playOnAwake = false;
            _videoPlayer.isLooping = true;
            _videoPlayer.audioOutputMode = VideoAudioOutputMode.Direct;
            _videoPlayer.loopPointReached += OnVideoEnd;
        }
        
        // 初始隐藏视频面板
        gameObject.SetActive(false);
    }

    /// <summary>播放指定视频文件（StreamingAssets/Videos/ 下）</summary>
    public void PlayVideo(string fileName)
    {
        if (_videoPlayer == null) return;

        string safeName = string.IsNullOrEmpty(fileName) ? "bandage_demo.mp4" : fileName;
        string path = Application.streamingAssetsPath.TrimEnd('/') + "/Videos/" + safeName;
        _videoPlayer.source = VideoSource.Url;
        _videoPlayer.url = path;

        // 创建 RenderTexture
        if (_renderTexture == null)
        {
            int w = _videoPlayer.targetTexture != null ? _videoPlayer.targetTexture.width : 640;
            int h = _videoPlayer.targetTexture != null ? _videoPlayer.targetTexture.height : 360;
            _renderTexture = new RenderTexture(w, h, 0);
            _videoPlayer.targetTexture = _renderTexture;
            if (_rawImage != null) _rawImage.texture = _renderTexture;
        }

        _videoPlayer.Play();
        _isPlaying = true;
        gameObject.SetActive(true);
    }

    public void StopVideo()
    {
        if (_videoPlayer != null) _videoPlayer.Stop();
        _isPlaying = false;
        gameObject.SetActive(false);
    }

    public void PauseVideo()
    {
        if (_videoPlayer != null) _videoPlayer.Pause();
    }

    public void ResumeVideo()
    {
        if (_videoPlayer != null) _videoPlayer.Play();
    }

    private void OnVideoEnd(VideoPlayer vp)
    {
        // 真人演示视频播完自动循环
        vp.Play();
    }

    private void OnDestroy()
    {
        if (_renderTexture != null)
        {
            _renderTexture.Release();
            Destroy(_renderTexture);
        }
    }
}