using UnityEngine;
using UnityEngine.Video;

public class Game360VideoBackground : MonoBehaviour
{
    [SerializeField] private VideoClip videoClip;
    [SerializeField] private int renderTextureSize = 2048;
    [SerializeField] private bool muteVideoAudio = true;
    [SerializeField, Range(0f, 360f)] private float skyboxRotationDegrees = 0f;
    [SerializeField, Range(0f, 8f)] private float skyboxExposure = 1f;

    private GameObject videoPlayerObject;
    private Material skyboxMaterial;
    private Material previousSkybox;
    private RenderTexture renderTexture;
    private VideoPlayer videoPlayer;

    private void Awake()
    {
        if (videoClip == null)
        {
            Debug.LogWarning("[Game360VideoBackground] videoClip is not assigned.");
            return;
        }

        CreateSkyboxMaterial();
        CreateVideoPlayer();
    }

    private void OnDestroy()
    {
        if (videoPlayer != null)
        {
            videoPlayer.prepareCompleted -= OnVideoPrepared;
            videoPlayer.errorReceived -= OnVideoError;
        }

        if (renderTexture != null)
        {
            renderTexture.Release();
            Destroy(renderTexture);
        }

        RenderSettings.skybox = previousSkybox;
        DynamicGI.UpdateEnvironment();

        if (skyboxMaterial != null)
            Destroy(skyboxMaterial);

        if (videoPlayerObject != null)
            Destroy(videoPlayerObject);
    }

    private void CreateSkyboxMaterial()
    {
        renderTexture = new RenderTexture(renderTextureSize, renderTextureSize / 2, 0, RenderTextureFormat.ARGB32)
        {
            name = "Game360VideoRenderTexture",
            wrapMode = TextureWrapMode.Clamp,
            filterMode = FilterMode.Bilinear,
        };
        renderTexture.Create();

        previousSkybox = RenderSettings.skybox;
        skyboxMaterial = new Material(ResolveSkyboxShader())
        {
            name = "Game360VideoMaterial",
        };
        skyboxMaterial.SetTexture("_MainTex", renderTexture);
        skyboxMaterial.SetFloat("_ImageType", 0f);
        skyboxMaterial.SetFloat("_Mapping", 0f);
        skyboxMaterial.SetFloat("_Layout", 0f);
        ApplySkyboxSettings();

        RenderSettings.skybox = skyboxMaterial;
        DynamicGI.UpdateEnvironment();
    }

    private void CreateVideoPlayer()
    {
        videoPlayerObject = new GameObject("[360 Video Skybox Player]");
        videoPlayerObject.transform.SetParent(transform, false);

        videoPlayer = videoPlayerObject.AddComponent<VideoPlayer>();
        videoPlayer.playOnAwake = false;
        videoPlayer.isLooping = true;
        videoPlayer.waitForFirstFrame = true;
        videoPlayer.renderMode = VideoRenderMode.RenderTexture;
        videoPlayer.targetTexture = renderTexture;
        videoPlayer.clip = videoClip;
        videoPlayer.audioOutputMode = muteVideoAudio
            ? VideoAudioOutputMode.None
            : VideoAudioOutputMode.Direct;
        videoPlayer.prepareCompleted += OnVideoPrepared;
        videoPlayer.errorReceived += OnVideoError;
        videoPlayer.Prepare();
    }

    private static Shader ResolveSkyboxShader()
    {
        return Shader.Find("Skybox/Panoramic")
               ?? Shader.Find("Skybox/6 Sided")
               ?? Shader.Find("Standard");
    }

    private void OnVideoPrepared(VideoPlayer source)
    {
        source.Play();
    }

    private void OnValidate()
    {
        ApplySkyboxSettings();
    }

    private void ApplySkyboxSettings()
    {
        if (skyboxMaterial == null)
            return;

        skyboxMaterial.SetFloat("_Exposure", skyboxExposure);
        skyboxMaterial.SetFloat("_Rotation", skyboxRotationDegrees);
        DynamicGI.UpdateEnvironment();
    }

    private static void OnVideoError(VideoPlayer source, string message)
    {
        Debug.LogWarning($"[Game360VideoBackground] VideoPlayer error: {message}");
    }
}