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


[Serializable]
public class SubScene
{

    public string name;
    public Camera camera;

    public Clickable exterior;

    public SchoolManager sceneManager;
}

public class CameraManager : MonoBehaviour
{
    #region  Singleton
    public static CameraManager singleton;

    private void Awake()
    {
        if (singleton == null)
        {
            singleton = this;
        }
        else if (singleton != this)
        {
            Destroy(gameObject);
        }
    }
    #endregion

    public string[] allScenes = new string[]
    {
        "Ag",
        "Legumes",
        "Lake",
        "Singe Debout",
        "Brutus et rufius",
    };

    public string[] scenes = new string[]
    {
        // "Ag",
        // "Legumes",
        "Lake",
        "Singe Debout",
        "Brutus et rufius",
    };
    [SerializeField] private string currentSceneName = "Lake";

    [SerializeField] private Camera mainCamera;

    [SerializeField] private SubScene[] subScenes;


    [SerializeField] private int currentSubSceneIndex = -1;

    public SubScene CurrentSubScene => currentSubSceneIndex >= 0 ? subScenes[currentSubSceneIndex] : null;

    [SerializeField] private MusicManager musicManager;

    private Animator animator;
    [SerializeField] private VideoPlayer videoPlayer;

    private string currentVideoClipName;

    [SerializeField] private Texture2D hoverTexture, defaultTexture, loadingTexture;

    [SerializeField] private bool disableCursor = false;


    public bool isPlayingVideo => currentVideoClipName != null && videoPlayer.isPlaying;

    public bool CanSkipVideo = true;

    private Action onVideoEnd;

    public Action OnVideoStart;

    void Start()
    {
        animator = GetComponent<Animator>();
        videoPlayer = GetComponent<VideoPlayer>();
        videoPlayer.renderMode = VideoRenderMode.RenderTexture;

        videoPlayer.loopPointReached += OnStopVideo;

        videoPlayer.prepareCompleted += OnPrepareCompleted;

        foreach (var scene in subScenes)
        {
            scene.camera.gameObject.SetActive(false);
            scene.exterior.AssociatedSubScene = scene;
        }

        ShowDefaultTexture();

    }

    #region Cursor

    [SerializeField] private Vector2 hotSpotHover = new(25, 20);

    public void ShowHoverTexture()
    {
        if (disableCursor) return;
        Cursor.visible = true;
        Cursor.SetCursor(hoverTexture, hotSpotHover, CursorMode.ForceSoftware);
    }

    public void ShowDefaultTexture()
    {
        if (disableCursor) return;
        Cursor.visible = true;
        Cursor.SetCursor(defaultTexture, hotSpotHover, CursorMode.ForceSoftware);
    }

    void ShowLoadingCursor()
    {
        if (disableCursor) return;
        Cursor.visible = true;
        Cursor.SetCursor(loadingTexture, Vector2.zero, CursorMode.ForceSoftware);
    }

    #endregion

    private Camera GetCurrentCamera()
    {
        return CurrentSubScene?.camera != null ? CurrentSubScene.camera : mainCamera;
    }

    #region Navigation

    public void UpdateArrows()
    {
        int currentSceneIndex = Array.FindIndex(scenes, s => s == currentSceneName);

        musicManager.GoToScene(currentSceneName);

        CanvasManager.singleton.ShowArrows();

        bool inSubScene = currentSubSceneIndex >= 0;
        CanvasManager.singleton.leftArrow.SetActive(!inSubScene && currentSceneIndex > 0);
        CanvasManager.singleton.rightArrow.SetActive(!inSubScene && currentSceneIndex < scenes.Length - 1);
        CanvasManager.singleton.goBackArrow.SetActive(inSubScene);
    }

    public void MoveLeft(bool updateArrows = true)
    {
        GameManager.singleton.soundManager.PlaySwishSound();
        int currentSceneIndex = Array.FindIndex(scenes, s => s == currentSceneName);
        currentSceneIndex--;
        if (currentSceneIndex < 0)
        {
            currentSceneIndex = 0;
        }
        currentSceneName = scenes[currentSceneIndex];
        animator.SetTrigger(scenes[currentSceneIndex]);
        if (updateArrows) UpdateArrows();
    }

    public void MoveRight(bool updateArrows = true)
    {
        GameManager.singleton.soundManager.PlaySwishSound();
        int currentSceneIndex = Array.FindIndex(scenes, s => s == currentSceneName);
        currentSceneIndex++;
        if (currentSceneIndex >= scenes.Length)
        {
            currentSceneIndex = scenes.Length - 1;
        }
        currentSceneName = scenes[currentSceneIndex];
        animator.SetTrigger(scenes[currentSceneIndex]);
        if (updateArrows) UpdateArrows();
    }

    public void MoveToSubScene(string scene, Action onEnd = null)
    {
        SubScene currentSubScene = Array.Find(subScenes, s => s.name == scene);
        if (currentSubScene == null)
        {
            Debug.LogError("SubScene not found");
            return;
        }
        currentSubSceneIndex = Array.IndexOf(subScenes, currentSubScene);
        currentSubScene.exterior.Enter();
        musicManager.GoToScene(scene);
        Fader.Fade(() =>
        {
            onEnd?.Invoke();
            mainCamera.gameObject.SetActive(false);
            currentSubScene.camera.gameObject.SetActive(true);
            CanvasManager.singleton.EnterSubScene();
        });
    }

    public void MoveToMainScene(Action next = null)
    {
        Fader.Fade(() =>
        {
            CurrentSubScene.exterior.Exit();
            mainCamera.gameObject.SetActive(true);
            CurrentSubScene.camera.gameObject.SetActive(false);
            CanvasManager.singleton.ShowArrows();
            currentSubSceneIndex = -1;
            UpdateArrows();
            next?.Invoke();
        });
    }

    public void AddSceneLeft(string sceneName)
    {
        List<string> scenesList = new(scenes);
        scenesList.Insert(0, sceneName);
        scenes = scenesList.ToArray();
    }

    public void GoToEnding()
    {
        int endingIndex = Array.FindIndex(scenes, s => s == "Singe Debout");
        int cur = Array.FindIndex(scenes, s => s == currentSceneName);
        GameManager.singleton.endingItem.SetActive(true);
        GameManager.singleton.mainScene.JumpToScene("Ending");
        for (int i = 0; i < Math.Abs(endingIndex - cur); i++)
        {
            if (endingIndex > cur) MoveRight(false);
            else MoveLeft(false);
        }
        CanvasManager.singleton.HideArrows();
    }

    #endregion

    #region Video

    private float skip = 0;

    public void PlayVideo(
        VideoAsset videoAsset,
        Action onEnd = null,
        float? skip = null
    )
    {

        skip = skip ?? 0;
        if (videoAsset == null)
        {
            Debug.LogError("VideoAsset is null");
            return;
        }

        if (isPlayingVideo) return;

        GameManager.singleton.soundManager.StopSound();
        musicManager.PauseMusic();

        if (onEnd != null)
        {
            onVideoEnd = onEnd;
        }
        videoPlayer.renderMode = VideoRenderMode.RenderTexture;
        videoPlayer.targetCamera = GetCurrentCamera();
        currentVideoClipName = videoAsset.name;
        VideoPlayManager.RegisterPlay(videoAsset);
        videoAsset.Play(videoPlayer);
        videoPlayer.isLooping = false;
        videoPlayer.playbackSpeed = 1;
        ShowLoadingCursor();
        videoPlayer.Prepare();
        Fader.instance.SetFullBlack();
    }

    private void OnPrepareCompleted(VideoPlayer source)
    {
        OnVideoStart?.Invoke();
        CanvasManager.singleton.PlayVideo();
        videoPlayer.Play();
        videoPlayer.time = skip;
        ShowDefaultTexture();
        // Cursor.visible = false;
    }

    public void IncreaseSpeed()
    {
        videoPlayer.playbackSpeed *= 1.3f;
    }

    public void StopVideo()
    {
        OnStopVideo(videoPlayer);
    }

    public void OnStopVideo(VideoPlayer source)
    {
        source.Stop();
        Cursor.visible = true;
        CanvasManager.singleton.StopVideoUI();
        musicManager.ResumeMusic();
        currentVideoClipName = null;
        ShowDefaultTexture();
        onVideoEnd?.Invoke();
        Fader.instance.SetTransparent();
        GameManager.singleton.OnEndVideo();
    }

    public void ToggleEnding()
    {
        CanSkipVideo = false;
    }

    #endregion

    void Update()
    {
        // Handle input in video mode
        if (isPlayingVideo)
        {
            // if (Cursor.visible) Cursor.visible = false;
            if (!CanSkipVideo) return;

            // Leftclick
            if (Input.GetMouseButtonDown(0))
            {
                CanvasManager.singleton.DisplaySkipButton();
                return;
            }
            // Rightclick or escape 
            if (Input.GetMouseButton(1) || Input.GetKeyDown(KeyCode.Escape))
            {
                StopVideo();
                return;
            }

            return;
        }

        // Handle input in main scene
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            MoveLeft();
        }
        else if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            MoveRight();
        }
        else if (Input.GetKeyDown(KeyCode.Escape) && CurrentSubScene != null)
        {
            MoveToMainScene();
        }
    }

    public void UnlockAll()
    {
        scenes = allScenes;
        UpdateArrows();
    }
}