using System;
using System.CodeDom;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using UnityEditor;
using UnityEngine;

namespace IcecreamView.Editor
{
    public static class IceCreamCodeUtils
    {

        public const string Templete = @"using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using IcecreamView;

#NamespaceStart

    public class #ScriptName : #Abstract
    {
        public override void OnOpenView(IC_ViewData parameters)
        {
            
        }

        public override void OnCloseView()
        {
            
        }
    }
#NamespaceEnd
";

        public const string UIPanelTemplete = @"
using IcecreamView;

#NamespaceStart
    public class UIPanel
    {
        //Code start
        //Code end
    }
#NamespaceEnd
";
        
        public static void CreateCode(SerializedObject target)
        {
            if (target.targetObject == null || string.IsNullOrEmpty(target.targetObject.name))
            {
                return;
            }

            // CodeCompileUnit unit = new CodeCompileUnit();
            // //设置命名空间（这个是指要生成的类的空间）
            // CodeNamespace myNamespace = new CodeNamespace("Joh.Test");
            // //导入必要的命名空间引用
            // myNamespace.Imports.Add(new CodeNamespaceImport("System"));
            // myNamespace.Imports.Add(new CodeNamespaceImport("UnityEngine"));
            // //Code:代码体
            // CodeTypeDeclaration myClass = new CodeTypeDeclaration(className);

            string className = string.IsNullOrEmpty(GlobalInstance.NameSpacePath) ? target.targetObject.name : GlobalInstance.NameSpacePath + "." + target.targetObject.name;
            string objPath   = GetGameObjectPath(((IC_ModuleConnector) target.targetObject).transform);
            WriteFile("Temp", "ICE_ACTION.tmp", StringToArrayByteUtf8(className + "#" + objPath));

            string path     = $"Assets/{GlobalInstance.FilePath ?? "Scripts/View"}";
            string fileName = $"{target.targetObject.name.Replace(" ", "")}.cs";
            if (!File.Exists(path + "/" + fileName))
            {
                //创建代码
                string fileContent = Templete;
                if (string.IsNullOrEmpty(GlobalInstance.NameSpacePath) == false)
                {
                    fileContent = fileContent.Replace("#NamespaceStart", $"namespace {GlobalInstance.NameSpacePath}" + "{");
                    fileContent = fileContent.Replace("#NamespaceEnd",   "}");
                }
                else
                {
                    fileContent = fileContent.Replace("#NamespaceStart", "");
                    fileContent = fileContent.Replace("#NamespaceEnd",   "");
                }

                fileContent = fileContent.Replace("#Abstract",   GlobalInstance.AbstractClass ?? "IC_AbstractModule");
                fileContent = fileContent.Replace("#ScriptName", target.targetObject.name);
                WriteFile(path, fileName, StringToArrayByteUtf8(fileContent));
                Debug.Log("构建UI代码完成：" + path + "/" + fileName);
                UpdateUIPanel(target.targetObject.name.Replace(" ", ""));
                AssetDatabase.Refresh();
            }
            else
            {
                // Debug.Log("已存在相同文件名：" + path + "/" + fileName);
                BindComponent();
            }
        }
        //
        // [MenuItem("Icecream/UpdatePanel")]
        // public static void MainTest()
        // {
        //     UpdateUIPanel("Test");
        // }

        /// <summary>
        /// 更新UIPanel
        /// </summary>
        public static void UpdateUIPanel(String name)
        {
            var path     = GlobalInstance.FilePath;
            var fileName = "UIPanel.cs";
            if (!File.Exists("Assets/" + path + "/" + fileName))
            {
                CreateUIPanel();
            }
            var fileContent = ReadFile("Assets/" + path, fileName);
            // Debug.Log(fileContent);
            var startIndex = fileContent.IndexOf("//Code start", StringComparison.Ordinal) + 13;
            var endIndex = fileContent.IndexOf("//Code end", StringComparison.Ordinal) - 10;
            var panelContent = fileContent.Substring(startIndex , endIndex - startIndex);
            // Debug.Log(panelContent);
            var panelList = panelContent.Split(';');
            List<String> panelNames = new List<string>();
            var temp = "public const string ";
            bool isCreate = true;
            foreach (var panel in panelList)
            {
                var start = panel.IndexOf(temp, StringComparison.Ordinal);
                if (start > 0)
                {
                    var p2 = panel.Substring(start + temp.Length);
                    var panelName = p2.Substring(0, p2.IndexOf(" ", StringComparison.Ordinal));
                    panelNames.Add(panelName);
                    if (panelName.Equals(name , StringComparison.Ordinal))
                    {
                        isCreate = false;
                    }
                }
            }

            if (isCreate)
            {
                //添加新Panel
                fileContent = fileContent.Insert(endIndex, $"\r\n        {temp}{name} \t\t\t=\"{name}\";");
                Debug.Log("构建UIPanel完成: " + name);
            }
            // Debug.Log(fileContent);
            WriteFile("Assets/"+path, fileName, StringToArrayByteUtf8(fileContent));
        }

        public static void CreateUIPanel()
        {
            var path = "Assets/" + GlobalInstance.FilePath;
            var fileName = "UIPanel.cs";
            // if (File.Exists(path + "/" + fileName))
            // {
            //     File.Delete(path + "/" + fileName);
            // }
            var fileContent = UIPanelTemplete;
            if (string.IsNullOrEmpty(GlobalInstance.NameSpacePath) == false)
            {
                fileContent = fileContent.Replace("#NamespaceStart", $"namespace {GlobalInstance.NameSpacePath}" + "{");
                fileContent = fileContent.Replace("#NamespaceEnd",   "}");
            }
            else
            {
                fileContent = fileContent.Replace("#NamespaceStart", "");
                fileContent = fileContent.Replace("#NamespaceEnd",   "");
            }
            WriteFile(path, fileName, StringToArrayByteUtf8(fileContent));
        }

        [UnityEditor.Callbacks.DidReloadScripts]
        public static void BindComponent()
        {
            if (File.Exists("Temp/ICE_ACTION.tmp") == false)
            {
                return;
            }

            string fileContent = ReadFile("Temp", "ICE_ACTION.tmp");
            File.Delete("Temp/ICE_ACTION.tmp");
            string className = fileContent.Substring(0, fileContent.IndexOf("#", StringComparison.Ordinal));
            string objPath   = fileContent.Substring(fileContent.IndexOf("#", StringComparison.Ordinal) + 1);
            var    assembly  = Assembly.Load(GlobalInstance.AssemblyName);
            if (assembly == null)
            {
                Debug.LogError("加载失败：" + GlobalInstance.AssemblyName);
                return;
            }

            Type t   = assembly.GetType(className);
            var  obj = GameObject.Find(objPath);
            if (t != null)
            {
                if (!obj.GetComponent(t))
                {
                    obj.gameObject.AddComponent(t);
                }

                var prefabPath = "Assets/" + GlobalInstance.PrefabsPath + "/" + obj.name + ".prefab";
                if (Directory.Exists("Assets/" + GlobalInstance.PrefabsPath) == false)
                {
                    Directory.CreateDirectory("Assets/" + GlobalInstance.PrefabsPath);
                }

                if (File.Exists(prefabPath))
                {
                    //保存修改到预制体
                    PrefabUtility.ApplyPrefabInstance(obj, InteractionMode.AutomatedAction);
                }
                else
                {
                    //创建预制体
                    PrefabUtility.SaveAsPrefabAssetAndConnect(obj, prefabPath, InteractionMode.AutomatedAction);
                }

                Debug.Log("构建UI预制体完成：" + prefabPath);
                AssetDatabase.Refresh();
            }
        }

        private static string GetGameObjectPath(Transform obj)
        {
            Transform selectChild = obj;
            string    result      = selectChild.name;
            if (selectChild != null)
            {
                while (selectChild.parent != null)
                {
                    selectChild = selectChild.parent;
                    result      = string.Format("{0}/{1}", selectChild.name, result);
                }
            }
            return result;
            // Debug.Log(string.Format("The gameobject:{0}'s path has been copied to the clipboard!", obj.name));
        }


        private static IC_GlobalSetting _globalInstance;

        public static IC_GlobalSetting GlobalInstance
        {
            get
            {
                if (_globalInstance == null)
                {
#if UNITY_EDITOR
                    _globalInstance = AssetDatabase.LoadAssetAtPath<IC_GlobalSetting>("Assets/IceCreamGlobalSettings.asset");
                    if (_globalInstance == null)
                    {
                        _globalInstance = ScriptableObject.CreateInstance<IC_GlobalSetting>();
                        // 自定义资源保存路径
                        string path = "Assets/";
                        //如果项目总不包含该路径，创建一个
                        if (!Directory.Exists(path))
                        {
                            Directory.CreateDirectory(path);
                        }

                        AssetDatabase.CreateAsset(_globalInstance, path + "/IceCreamGlobalSettings.asset");
                        AssetDatabase.Refresh();
                        _globalInstance = AssetDatabase.LoadAssetAtPath<IC_GlobalSetting>("Assets/IceCreamGlobalSettings.asset");
                    }
#endif
                }

                return _globalInstance;
            }
        }

        public static void WriteFile(string path, string fileName, byte[] content)
        {
            CreateDirectory(path);
            var        fullName = path + "/" + fileName;
            FileStream fs       = new FileStream(fullName, FileMode.Create, FileAccess.Write, FileShare.None, 4096, FileOptions.None);
            fs.Write(content, 0, content.Length);
            fs.Close();
        }

        public static void CreateDirectory(string path)
        {
            if (!(Directory.Exists(path) || File.Exists(path)))
            {
                Directory.CreateDirectory(path);
            }
        }

        public static string ReadFile(string path, string fileName)
        {
            var fullName = path + "/" + fileName;
            if (Directory.Exists(path) || File.Exists(path))
            {
                FileStream fs    = new FileStream(fullName, FileMode.Open, FileAccess.Read, FileShare.None, 4096, FileOptions.None);
                byte[]     bytes = new byte[fs.Length];
                fs.Read(bytes, 0, bytes.Length);
                fs.Close();
                return ArrayByteUtf8ToString(bytes);
            }

            return null;
        }

        public static byte[] StringToArrayByteUtf8(string value) { return Encoding.UTF8.GetBytes(value); }
        public static string ArrayByteUtf8ToString(byte[] bytes) { return Encoding.UTF8.GetString(bytes); }

    }
}