using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;
using DG.Tweening;

namespace Ashwild.UI
{
    /// <summary>
    /// Plays a full-screen splash video at launch, then fades out to reveal the menu underneath.
    /// Decoupled from UIManager: it lives on its own high-sorting-order Canvas and simply covers
    /// the menu until the clip ends.
    /// </summary>
    [RequireComponent(typeof(CanvasGroup))]
    public class SplashScreenController : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] private VideoPlayer videoPlayer;
        [SerializeField] private RawImage videoImage;
        [SerializeField] private RenderTexture renderTexture;

        [Header("Fade Out")]
        [SerializeField] private float fadeOutDuration = 0.5f;
        [SerializeField] private Ease fadeOutEase = Ease.InQuad;

        private CanvasGroup canvasGroup;
        private bool finished;

        private void Awake()
        {
            canvasGroup = GetComponent<CanvasGroup>();

            // Cover everything immediately so the menu initializes hidden underneath.
            canvasGroup.alpha = 1f;
            canvasGroup.blocksRaycasts = true;
            canvasGroup.interactable = true;
        }

        private void OnEnable()
        {
            if (videoPlayer != null)
                videoPlayer.loopPointReached += OnVideoFinished;
        }

        private void OnDisable()
        {
            if (videoPlayer != null)
                videoPlayer.loopPointReached -= OnVideoFinished;
        }

        private void Start()
        {
            if (videoPlayer == null || videoPlayer.clip == null)
            {
                Debug.LogWarning("SplashScreenController: no VideoPlayer/clip assigned, skipping splash.");
                FadeOut();
                return;
            }

            videoPlayer.isLooping = false;
            videoPlayer.renderMode = VideoRenderMode.RenderTexture;
            videoPlayer.targetTexture = renderTexture;

            // Prepare first to avoid a black flash / stutter on the first frame.
            videoPlayer.prepareCompleted += OnPrepared;
            videoPlayer.Prepare();
        }

        private void OnPrepared(VideoPlayer vp)
        {
            vp.prepareCompleted -= OnPrepared;
            if (renderTexture != null)
                renderTexture.DiscardContents();
            vp.Play();
        }

        private void OnVideoFinished(VideoPlayer vp) => FadeOut();

        private void FadeOut()
        {
            if (finished) return;
            finished = true;

            canvasGroup.blocksRaycasts = false;
            canvasGroup.interactable = false;

            canvasGroup.DOFade(0f, fadeOutDuration)
                .SetEase(fadeOutEase)
                .OnComplete(() =>
                {
                    if (videoPlayer != null) videoPlayer.Stop();
                    gameObject.SetActive(false);
                });
        }
    }
}