#if UNITY_EDITOR
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using AIGame.EditorTools;
using TMPro;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;

namespace AOT.Editor.WeChat
{
    public static class WeChatLoadingCover
    {
        public static void Configure(string mini)
        {
            string repo = Path.GetFullPath(Path.Combine(Application.dataPath,"../.."));
            string module = Path.Combine(repo,"Tools/WeChat/startup-loading.js");
            string gamePath = Path.Combine(mini,"game.js");
            string game = File.ReadAllText(gamePath);
            const string import = "import startupLoading from './startup-loading';";
            if (!game.Contains(import))
            {
                var pattern = new Regex(@"loadingPageConfig:\s*\{.*?(?=\r?\n\s{8}\}\);)",RegexOptions.Singleline);
                if (pattern.Matches(game).Count != 1) throw new InvalidOperationException("Cannot identify SDK loading-page configuration.");
                game = pattern.Replace(game,"loadingPageConfig: startupLoading,",1);
                game = import + Environment.NewLine + game;
            }
            if (!game.Contains("loadingPageConfig: startupLoading,")) throw new InvalidOperationException("SDK cover import has no configuration.");
            string output = Path.Combine(repo,"Tools/output/startup_presentation/startup-cover.png");
            Render(output);
            Directory.CreateDirectory(Path.Combine(mini,"images"));
            File.Copy(output,Path.Combine(mini,"images/startup-cover.png"),true);
            File.Copy(module,Path.Combine(mini,"startup-loading.js"),true);
            File.WriteAllText(gamePath,game,new UTF8Encoding(false));
        }

        static void Render(string path)
        {
            var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(BuildBootLoading.PrefabPath);
            if (prefab == null) throw new InvalidOperationException("Build the local loading prefab first.");
            var active = UnityEngine.SceneManagement.SceneManager.GetActiveScene();
            var scene = EditorSceneManager.NewScene(NewSceneSetup.EmptyScene,NewSceneMode.Additive);
            var previous = RenderTexture.active;
            var target = new RenderTexture(720,1280,24);
            var pixels = new Texture2D(720,1280,TextureFormat.RGB24,false);
            try
            {
                var root = (GameObject)PrefabUtility.InstantiatePrefab(prefab,scene);
                root.transform.Find("LoadingCard").gameObject.SetActive(false);
                var cameraObject = new GameObject("CoverRenderCamera",typeof(Camera));
                UnityEngine.SceneManagement.SceneManager.MoveGameObjectToScene(cameraObject,scene);
                var camera = cameraObject.GetComponent<Camera>();
                camera.targetTexture=target;camera.cullingMask=1<<LayerMask.NameToLayer("UI");
                camera.clearFlags=CameraClearFlags.SolidColor;camera.backgroundColor=new Color(.54f,.72f,.76f);
                var canvas = root.GetComponent<Canvas>();
                canvas.renderMode=RenderMode.ScreenSpaceCamera;canvas.worldCamera=camera;canvas.planeDistance=1;
                Canvas.ForceUpdateCanvases();
                foreach(var text in root.GetComponentsInChildren<TMP_Text>()) text.ForceMeshUpdate();
                camera.Render();RenderTexture.active=target;
                pixels.ReadPixels(new Rect(0,0,720,1280),0,0);pixels.Apply();
                var colors = pixels.GetPixels32(); var first=colors[0]; int varied=0;
                foreach(var color in colors)
                    if(Mathf.Abs(color.r-first.r)+Mathf.Abs(color.g-first.g)+Mathf.Abs(color.b-first.b)>30) varied++;
                if(varied<colors.Length/10) throw new InvalidOperationException("Loading cover render is blank.");
                Directory.CreateDirectory(Path.GetDirectoryName(path));File.WriteAllBytes(path,pixels.EncodeToPNG());
            }
            finally
            {
                RenderTexture.active=previous;EditorSceneManager.CloseScene(scene,true);
                if (active.IsValid() && active.isLoaded) UnityEngine.SceneManagement.SceneManager.SetActiveScene(active);
                target.Release();UnityEngine.Object.DestroyImmediate(target);UnityEngine.Object.DestroyImmediate(pixels);
            }
        }
    }
}
#endif