using System;
using System.Collections;
using System.Collections.Generic;
using UC;
using UnityEditor;
using UnityEngine;

namespace Spout
{
    public class SceneViewSpoutSender : EditorWindow
    {
        static SceneViewSpoutSender exampleWindow;
        [MenuItem("Window/UC/Scene View Spout Sender")]
        static void Open()
        {
            if (exampleWindow == null)
            {
                exampleWindow = CreateInstance<SceneViewSpoutSender>();
            }
            exampleWindow.Show();
        }

        public string sharingName = "UnitySceneSender";
        
        public Spout.TextureFormat textureFormat = Spout.TextureFormat.DXGI_FORMAT_R8G8B8A8_UNORM;
        [AutoUI]
        public bool yFlip = true;

        [SerializeField]
        [Header("Automatic")]
        RenderTexture output;

        private bool senderIsCreated;
        private const int _createAttempts = 5;
        private int _attempts = 0;

        private bool textureSizeHasChanged = false;

        [SerializeField]
        private Shader m_Shader;
        public Shader shader
        {
            get
            {
                if (m_Shader == null)
                    m_Shader = Shader.Find("Unlit/AlphaPremultiplied");

                return m_Shader;
            }
        }

        private Material m_Material;
        public Material material
        {
            get
            {
                if (m_Material == null)
                    m_Material = ImageEffectHelper.CheckShaderAndCreateMaterial(shader);

                return m_Material;
            }
        }

        private void OnEnable()
        {
            SceneView.onSceneGUIDelegate += getTextureFromSceneView;
        }

        void getTextureFromSceneView(SceneView view)
        {
            RenderTexture s = view.camera.targetTexture;

            if (s == null)
                return;

            bool isValid = (output != null) && s.width == output.width && s.height == output.height;
            if (!isValid)
            {
                if (output != null)
                    output.Release();
                output = new RenderTexture(s.width, s.height, s.depth, RenderTextureFormat.ARGB32);
                output.Create();
            }
            textureSizeHasChanged = !isValid;

            material.SetInt("yFlip", yFlip ? 1 : 0);
            GL.sRGBWrite = (QualitySettings.activeColorSpace == ColorSpace.Linear);
            Graphics.Blit(s, output, material);
            GL.sRGBWrite = false;
        }

        void OnGUI()
        {
            //エスケープを押した時に閉じる
            if (Event.current.keyCode == KeyCode.Escape)
            {
                exampleWindow.Close();
            }

            //sharingName = EditorGUILayout.TextField(sharingName);

            if(Application.isPlaying == false)
                EditorGUILayout.HelpBox("Play the scene to enable spout", MessageType.Warning, true);

        }

        void OnDisable()
        {
            SceneView.onSceneGUIDelegate -= getTextureFromSceneView;

            _CloseSender();

            if (m_Material != null)
                DestroyImmediate(m_Material);

            m_Material = null;
        }

        void Update()
        {
            if (Application.isPlaying == false)
                return;

            if (output == null) return;
            if (textureSizeHasChanged) _CloseSender();

            if (senderIsCreated)
                Spout.instance.UpdateSender(sharingName, output); 
            else
                _CreateSender(output);
        }

        private void _CreateSender(Texture texture)
        {
            if (texture == null) return;
            if (!Spout.instance.enabled) return;

            if (!senderIsCreated)
            {
                Debug.Log("Sender is not created, creating one");
                senderIsCreated = Spout.instance.CreateSender(sharingName, texture, (int)textureFormat);
            }

            _attempts++;
            if (_attempts > _createAttempts)
                Debug.LogWarning(System.String.Format("There are problems with creating the sender {0}. Please check your settings or restart Unity.", sharingName));

            Spout.instance.OnSenderStopped -= OnSenderStoppedDelegate;
            Spout.instance.OnSenderStopped += OnSenderStoppedDelegate;

            Spout.instance.OnAllSendersStopped -= OnAllSendersStoppedDelegate;
            Spout.instance.OnAllSendersStopped += OnAllSendersStoppedDelegate;

            Spout.instance.OnEnabled -= _OnSpoutEnabled;
            Spout.instance.OnEnabled += _OnSpoutEnabled;
        }

        private void _OnSpoutEnabled()
        {
            //Debug.Log("SpoutSender._OnSpoutEnabled");
            //if (enabled)
            {
                //force a reconnection
            //    enabled = !enabled;
            //    enabled = !enabled;
            }
        }

        private void _CloseSender()
        {
            Debug.Log("SpoutSender._CloseSender:" + sharingName);
            if (senderIsCreated) Spout.CloseSender(sharingName);
            _CloseSenderCleanUpData();
        }

        private void OnSenderStoppedDelegate(object sender, TextureShareEventArgs e)
        {
            //Debug.Log("SpoutSender.OnSenderStoppedDelegate:"+e.sharingName);
            if (e.sharingName == sharingName)
            {
                _CloseSenderCleanUpData();
            }
        }

        private void OnAllSendersStoppedDelegate()
        {
            _CloseSenderCleanUpData();
        }

        private void _CloseSenderCleanUpData()
        {
            senderIsCreated = false;
        }
    }
}