using System.Collections.Generic;
using Fusion;
using UnityEngine;

public class RenderTextureSender : NetworkBehaviour
{
    public Camera targetCamera;
    public GameObject OtherWhiteBoard;
    private bool isInitialized = false;

    private const int MaxPayloadSize = 450; // حداکثر اندازه چانک
    private Texture2D previousTexture; // ذخیره تکسچر قبلی برای مقایسه
    public GameObject back;
    private float resendTimer;
    private List<byte> textureDataList = new List<byte>(); // برای ذخیره داده‌های چانک‌ها

    public override void Spawned()
    {
        base.Spawned();

        if (Object == null)
        {
            Debug.LogError("[Photon Fusion] NetworkObject مقداردهی نشده است!");
            return;
        }

        isInitialized = true;
        Debug.Log("[Photon Fusion] RenderTextureSender Initialized.");
    }

    private void Start()
    {
        if (targetCamera == null)
        {
            Debug.LogError("[Photon Fusion] Target Camera مقداردهی نشده است!");
        }
        resendTimer = Time.time;
    }
    public int timerLoad = 60;
    private void Update()
    {
        if (isInitialized && Time.time > resendTimer)
        {
            resendTimer = Time.time + timerLoad;
            SendRenderTexture();
            Remove();
        }
    }

    public void Remove()
    {
        if (back != null)
        {
            back.gameObject.SetActive(false);
        }
    }

    [Rpc(RpcSources.StateAuthority, RpcTargets.All)]
    public void RPC_SendRenderTexture(byte[] textureData, int chunkIndex, int totalChunks)
    {
        Debug.Log("Received Chunk: " + chunkIndex + "/" + totalChunks);

        if (!isInitialized)
        {
            Debug.LogError("[Photon Fusion] هنوز مقداردهی نشده است!");
            return;
        }

        textureDataList.AddRange(textureData);

        if (chunkIndex == totalChunks - 1) // دریافت کامل چانک‌ها
        {
            Texture2D receivedTexture = new Texture2D(2, 2);
            receivedTexture.LoadImage(textureDataList.ToArray());
            ApplyTexture(receivedTexture);
            textureDataList.Clear();
        }
    }

    public void SendRenderTexture()
    {
        if (Object == null)
        {
            Debug.LogError("[Photon Fusion] NetworkObject مقداردهی نشده است!");
            return;
        }

        //if (!Object.HasInputAuthority)
        {
     //       Debug.LogWarning("[Photon Fusion] شما دسترسی لازم برای ارسال RPC ندارید!");
    //        return;
        }

        if (targetCamera == null || targetCamera.targetTexture == null)
        {
            Debug.LogError("[Photon Fusion] Target Camera یا RenderTexture مقداردهی نشده است!");
            return;
        }

        Texture2D currentTexture = GetTextureFromRenderTexture(targetCamera.targetTexture);

        if (previousTexture != null && AreTexturesEqual(previousTexture, currentTexture))
        {
            return; // عدم ارسال در صورت نبود تغییرات
        }

        previousTexture = currentTexture;

        byte[] textureData = RenderTextureUtils.RenderTextureToByteArray(targetCamera.targetTexture);
        int totalChunks = Mathf.CeilToInt(textureData.Length / (float)MaxPayloadSize);

        for (int i = 0; i < totalChunks; i++)
        {
            int chunkSize = Mathf.Min(MaxPayloadSize, textureData.Length - i * MaxPayloadSize);
            byte[] chunkData = new byte[chunkSize];
            System.Array.Copy(textureData, i * MaxPayloadSize, chunkData, 0, chunkSize);

            RPC_SendRenderTexture(chunkData, i, totalChunks);
        }
    }

    private void ApplyTexture(Texture2D texture)
    {
        if (OtherWhiteBoard == null)
        {
            OtherWhiteBoard = GameObject.FindGameObjectWithTag("whiteboard");
        }

        if (OtherWhiteBoard == null)
        {
            Debug.LogError("[Photon Fusion] OtherWhiteBoard مقداردهی نشده است!");
            return;
        }

        Renderer renderer = OtherWhiteBoard.GetComponent<Renderer>();
        if (renderer != null)
        {
            if(!Runner.IsServer)
            renderer.GetComponent<MeshRenderer>().enabled = true;
            renderer.material.mainTexture = texture;
        }
    }

    private Texture2D GetTextureFromRenderTexture(RenderTexture renderTexture)
    {
        Texture2D texture = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.RGB24, false);
        RenderTexture.active = renderTexture;
        texture.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
        texture.Apply();
        RenderTexture.active = null;

        return texture;
    }

    private bool AreTexturesEqual(Texture2D texture1, Texture2D texture2)
    {
        if (texture1.width != texture2.width || texture1.height != texture2.height)
        {
            return false;
        }

        Color[] pixels1 = texture1.GetPixels();
        Color[] pixels2 = texture2.GetPixels();

        for (int i = 0; i < pixels1.Length; i++)
        {
            if (pixels1[i] != pixels2[i])
            {
                return false;
            }
        }

        return true;
    }
}

public static class RenderTextureUtils
{
    public static byte[] RenderTextureToByteArray(RenderTexture renderTexture)
    {
        if (renderTexture == null)
        {
            Debug.LogError("[RenderTextureUtils] RenderTexture مقداردهی نشده است!");
            return null;
        }

        Texture2D texture = new Texture2D(renderTexture.width, renderTexture.height, TextureFormat.RGB24, false);
        RenderTexture.active = renderTexture;
        texture.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
        texture.Apply();
        RenderTexture.active = null;

        return texture.EncodeToJPG(75);
    }
}