using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;
using UnityEngine.EventSystems;
using Fusion;
using System.Collections;
using System.Collections.Generic;

public class VideoPlayerManager : NetworkBehaviour
{
    public VideoPlayer videoPlayer;
    public RawImage raw;
    public Material sample;
    public GameObject loadingScreen;
    public Slider videoSlider;
    public Image play;
    public GameObject cast;
    public Transform startPoint;
    public Transform Player;

    private GameObject nearestTV;
    public float detectionRadius = 4f;
    public LineRenderer lineRenderer;
    private float lastSyncTime = 0f;
    private bool isDraggingSlider = false;

    public string videoUrl;

    [Networked]
    private bool isPlaying { get; set; }

    [Networked]
    private float videoTime { get; set; }

    void Start()
    {
        if (videoPlayer == null)
            videoPlayer = GetComponent<VideoPlayer>();

        videoPlayer.loopPointReached += OnVideoFinished;

        if (lineRenderer == null)
        {
            lineRenderer = gameObject.AddComponent<LineRenderer>();
            lineRenderer.startWidth = 0.05f;
            lineRenderer.endWidth = 0.05f;
            lineRenderer.positionCount = 20;
            lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
            lineRenderer.material.color = Color.yellow;
        }

        raw.material = new Material(sample);
        RenderTexture renderTexture = new RenderTexture(1920, 1080, 16);
        videoPlayer.targetTexture = renderTexture;
        raw.texture = renderTexture;

        // Slider drag listeners
        AddSliderDragHandlers();
        videoSlider.onValueChanged.AddListener(OnSliderValueChanged);
    }

    void Update()
    {
        if (!isDraggingSlider && videoPlayer.isPlaying)
        {
            videoSlider.value = (float)videoPlayer.time;
        }

        play.color = videoPlayer.isPlaying ? Color.green : Color.white;

        cast.SetActive(nearestTV);
        FindNearestTV();

        if (nearestTV != null)
            DrawCurvedLine();
        else
            lineRenderer.enabled = false;

        // Sync play state
        if (videoPlayer.isPlaying != isPlaying)
        {
            if (isPlaying)
                StartCoroutine(StartVideo());
            else
                videoPlayer.Pause();
        }
    }

    private IEnumerator StartVideo()
    {
        videoPlayer.Prepare();
        while (!videoPlayer.isPrepared)
        {
            yield return null;
        }

        loadingScreen.SetActive(false);

        videoSlider.minValue = 0;
        videoSlider.maxValue = (float)videoPlayer.length;

        videoPlayer.Play();
    }

    public void send()
    {
        if (Object.HasStateAuthority)
        {
            Play();
            InvokeRepeating(nameof(SyncVideoTime), 5f, 5f);
        }
    }

    public void Cast()
    {
        if (Object.HasStateAuthority && nearestTV != null)
        {
            RPC_SetScreenTexture(Object.Id, nearestTV.GetComponent<NetworkObject>().Id);
        }
    }

    public void Play()
    {
        if (Object.HasStateAuthority)
        {
            RPC_TogglePlayPause(videoUrl);
        }
    }

    [Rpc(RpcSources.All, RpcTargets.All)]
    private void RPC_TogglePlayPause(string url)
    {
        videoUrl = url;

        if (!string.IsNullOrEmpty(videoUrl) && url != videoPlayer.url)
        {
            Player.parent.gameObject.SetActive(true);
            Player.gameObject.SetActive(true);

            loadingScreen.SetActive(true);
            videoPlayer.url = videoUrl;
        }

        isPlaying = !isPlaying;
        videoTime = (float)videoPlayer.time;
        RPC_SyncVideoState(isPlaying, videoTime);
    }

    [Rpc(RpcSources.StateAuthority, RpcTargets.All)]
    private void RPC_SyncVideoState(bool playState, float syncTime)
    {
        isPlaying = playState;
        videoTime = syncTime;

        videoPlayer.time = syncTime;

        if (isPlaying) videoPlayer.Play();
        else videoPlayer.Pause();
    }

    private void SyncVideoTime()
    {
        if (Object.HasStateAuthority && videoPlayer.isPlaying)
        {
            float currentTime = (float)videoPlayer.time;
            RPC_SyncVideoState(isPlaying, currentTime);
        }
    }

    [Rpc(RpcSources.StateAuthority, RpcTargets.All)]
    private void RPC_SetScreenTexture(NetworkId playerId, NetworkId tvId)
    {
        GameObject[] allTVs = GameObject.FindGameObjectsWithTag("tv");

        foreach (var tv in allTVs)
        {
            if (tv.GetComponent<NetworkObject>().Id == tvId)
            {
                RawImage tvScreen = tv.GetComponentInChildren<RawImage>();
                if (tvScreen != null)
                {
                    tvScreen.texture = raw.texture;
                    tvScreen.material = raw.material;
                }
            }
        }
    }

    private void FindNearestTV()
    {
        GameObject[] tvObjects = GameObject.FindGameObjectsWithTag("tv");
        float minDistance = detectionRadius;
        nearestTV = null;

        foreach (var tv in tvObjects)
        {
            float distance = Vector3.Distance(transform.position, tv.transform.position);
            if (distance < minDistance)
            {
                minDistance = distance;
                nearestTV = tv;
            }
        }
    }

    private void DrawCurvedLine()
    {
        if (nearestTV == null || startPoint == null) return;

        lineRenderer.enabled = true;

        Vector3 start = startPoint.position;
        Vector3 end = nearestTV.transform.position;
        Vector3 middle = (start + end) / 2 + Vector3.up * 1;

        List<Vector3> curvePoints = new List<Vector3>();

        for (float t = 0; t <= 1; t += 0.05f)
        {
            Vector3 point = Mathf.Pow(1 - t, 2) * start + 2 * (1 - t) * t * middle + Mathf.Pow(t, 2) * end;
            curvePoints.Add(point);
        }

        lineRenderer.positionCount = curvePoints.Count;
        lineRenderer.SetPositions(curvePoints.ToArray());
    }

    private void OnVideoFinished(VideoPlayer vp)
    {
        isPlaying = false;
    }

    public void Show(string u)
    {
        videoUrl = u;
        Invoke("send", 1);
    }

    public void OnSliderValueChanged(float value)
    {
        if (isDraggingSlider)
        {
            videoPlayer.time = value;
        }
    }

    private void AddSliderDragHandlers()
    {
        EventTrigger trigger = videoSlider.gameObject.GetComponent<EventTrigger>();
        if (trigger == null)
            trigger = videoSlider.gameObject.AddComponent<EventTrigger>();

        trigger.triggers = new List<EventTrigger.Entry>();

        // Pointer Down
        EventTrigger.Entry entryDown = new EventTrigger.Entry();
        entryDown.eventID = EventTriggerType.PointerDown;
        entryDown.callback.AddListener((data) => { isDraggingSlider = true; });
        trigger.triggers.Add(entryDown);

        // Pointer Up
        EventTrigger.Entry entryUp = new EventTrigger.Entry();
        entryUp.eventID = EventTriggerType.PointerUp;
        entryUp.callback.AddListener((data) =>
        {
            isDraggingSlider = false;

            if (Object.HasStateAuthority)
            {
                videoTime = (float)videoPlayer.time;
                RPC_SyncVideoState(isPlaying, videoTime);
            }
        });
        trigger.triggers.Add(entryUp);
    }
}