using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using TModule.Runtime;
using UnityEditor;
using UnityEngine;
using LitJson;

namespace TModule.Editor
{
    public class AssetBudleTool : EditorWindow
    {
        private string AssetBudleConfigName= "AssetBundleConfig.asset";
        private string AssetBudleConfigPath;
        private string AssetbudleToolConfigName = "BudleToolConfig.asset";
        private  string AssetbudleToolConfigPath;
        private AssetBudleConfig _list;
        private AssetBudleConfig BudleConfig
        {
            get
            {
                _list = _list ?? AssetDatabase.LoadAssetAtPath<AssetBudleConfig>(AssetBudleConfigPath);
                if(_list==null)
                {
                    _list = CreateInstance<AssetBudleConfig>();
                    AssetDatabase.CreateAsset(_list, AssetBudleConfigPath);
                }
                return _list;
            }
            set => _list = value;
        }

        private AssetBudleToolConfig _toolConfig;

        private AssetBudleToolConfig BudleToolConfig
        {
            get
            {
                _toolConfig = _toolConfig ?? AssetDatabase.LoadAssetAtPath<AssetBudleToolConfig>(AssetbudleToolConfigPath);
                if(_toolConfig==null)
                {
                    _toolConfig = CreateInstance<AssetBudleToolConfig>();
                    AssetDatabase.CreateAsset(_toolConfig, AssetbudleToolConfigPath);
                }
                return _toolConfig;
            }
            set => _toolConfig = value;
        }

        private static List<VersionDataEntity> versionDatas = new List<VersionDataEntity>();

        private Vector2 _scorllView = Vector2.zero;

#if UNITY_STANDALONE_WIN
        private BuildTarget _buildTarget = BuildTarget.StandaloneWindows64;
#elif UNITY_ANDROID
        private BuildTarget _buildTarget = BuildTarget.Android;
#elif UNITY_IPHON
        private BuildTarget _buildTarget = BuildTarget.iOS;
#endif

        [MenuItem("TModule/热更/AssetBudleTool")]
        public static void OpenWin()
        {
            AssetBudleTool win = GetWindow<AssetBudleTool>();
            win.maxSize = new Vector2(800, 400);
            win.titleContent.text = "ABTool";
            win.titleContent.image = EditorGUIUtility.IconContent("PrefabModel Icon").image;
            win.Show();
        }

        private void OnEnable()
        {
            var ms = MonoScript.FromScriptableObject(this);
            var path = AssetDatabase.GetAssetPath(ms);
            path = Path.GetDirectoryName(path);
            AssetBudleConfigPath = Path.Combine(path, AssetBudleConfigName);
            AssetbudleToolConfigPath = Path.Combine(path, AssetbudleToolConfigName);
        }

        private void OnGUI()
        {
            using (new EditorGUILayout.HorizontalScope("Box"))
            {
                EditorGUILayout.LabelField("打包平台：", GUILayout.Width(60));
                _buildTarget = (BuildTarget)EditorGUILayout.EnumPopup(_buildTarget);
                EditorGUILayout.LabelField("输出路径：", GUILayout.Width(60));
                BudleToolConfig.m_savePath = EditorGUILayout.TextField(BudleToolConfig.m_savePath);
                if (GUILayout.Button(EditorGUIUtility.IconContent("Project@2x").image, GUILayout.Height(20), GUILayout.Width(40)))
                {
                    try
                    {
                        BudleToolConfig.m_savePath = EditorUtility.OpenFolderPanel("AB包输出路径", "Assets", "Assets");
                    }
                    catch (Exception e)
                    {
                        Debug.Log(e.Message);
                    }
                }
            }
            float _width = position.width / 6;
            using (new EditorGUILayout.HorizontalScope("Box"))
            {
                EditorGUILayout.LabelField("包名", GUILayout.Width(_width * 4));
                EditorGUILayout.LabelField("文件夹", GUILayout.Width(_width));
                EditorGUILayout.LabelField("操作");
            }

            _scorllView = EditorGUILayout.BeginScrollView(_scorllView);
            for (int i = 0; i < BudleConfig.m_AB.Count; i++)
            {
                using (new EditorGUILayout.HorizontalScope())
                {
                    BudleConfig.m_AB[i].m_name = EditorGUILayout.TextField(BudleConfig.m_AB[i].m_name, GUILayout.Width(_width * 4));
                    BudleConfig.m_AB[i].m_isFolder = EditorGUILayout.Toggle(BudleConfig.m_AB[i].m_isFolder, GUILayout.Width(_width));
                    if (GUILayout.Button(EditorGUIUtility.IconContent("TreeEditor.Trash").image, GUILayout.Height(20)))
                    {
                        BudleConfig.m_AB.Remove(BudleConfig.m_AB[i]);
                    }
                }
            }
            if (GUILayout.Button(EditorGUIUtility.IconContent("CreateAddNew@2x").image, GUILayout.Height(30), GUILayout.Width(30)))
            {
                BudleConfig.m_AB.Add(new AssetBundleEntity());
            }
            EditorGUILayout.EndScrollView();

            if (GUILayoutUtility.GetLastRect().Contains(Event.current.mousePosition))
            {
                if (Event.current.type == EventType.DragUpdated)
                    DragAndDrop.visualMode = DragAndDropVisualMode.Generic;
                else if (Event.current.type == EventType.DragExited)
                {
                    if (DragAndDrop.paths != null && DragAndDrop.paths.Length > 0)
                    {
                        for (int i = 0; i < DragAndDrop.paths.Length; i++)
                        {
                            if (BudleConfig.m_AB.Find(p => p.m_name == DragAndDrop.paths[i]) == null)
                                BudleConfig.m_AB.Add(new AssetBundleEntity()
                                { m_name = DragAndDrop.paths[i] });
                        }
                    }
                }
            }

            using (new EditorGUILayout.HorizontalScope())
            {
                EditorGUILayout.LabelField("将打包资源拷贝到StreamingAssets文件夹", GUILayout.Width(230));
                BudleToolConfig.m_copyToStreamingAssets = EditorGUILayout.Toggle(BudleToolConfig.m_copyToStreamingAssets);
            }

            if (GUILayout.Button("构建AssetBundle"))
            {
                OnAssetBundleCallBack();
            }
        }

        /// <summary>
        /// 打包回调
        /// </summary>
        private void OnAssetBundleCallBack()
        {
            string tartgetPath = BudleToolConfig.m_savePath + "/" + _buildTarget.ToString();
            if (!Directory.Exists(tartgetPath))
                Directory.CreateDirectory(tartgetPath);
            SetABName();
            BuildPipeline.BuildAssetBundles(tartgetPath, BuildAssetBundleOptions.None, _buildTarget);

            if (BudleToolConfig.m_copyToStreamingAssets)
                CopyToStreamingAssets();

            OnCreateVersionText();
            AssetDatabase.Refresh();
        }

        private void SetABName()
        {
            for (int i = 0; i < BudleConfig.m_AB.Count; i++)
            {
                AssetBundleEntity assetBudle = BudleConfig.m_AB[i];
                if (assetBudle.m_isFolder)
                {
                    string[] floderArr = new string[] {GetAbsolutePath(assetBudle.m_name) };
                    SaveFolderSettings(floderArr);
                }
                else
                {
                    SaveFileSettings(Application.dataPath + "/" + assetBudle.m_name);
                }
            }

        }

        private void SaveFolderSettings(string[] folderArr)
        {
            foreach (string floderPath in folderArr)
            {
                string[] arrFile = Directory.GetFiles(floderPath);

                foreach (string filePah in arrFile)
                {
                    SaveFileSettings(filePah);
                }

                string[] arrFolder = Directory.GetDirectories(floderPath);
                SaveFolderSettings(arrFolder);
            }
        }

        private void SaveFileSettings(string filePath)
        {
            FileInfo file = new FileInfo(filePath);
            if (!file.Extension.Equals(".meta", StringComparison.CurrentCultureIgnoreCase))
            {
                int index = filePath.IndexOf("Assets/", StringComparison.CurrentCultureIgnoreCase);

                string newPath = filePath.Substring(index);

                string fileName = newPath.Substring(newPath.IndexOf("Assets/")).Replace(file.Extension, "");

                string variant = file.Extension.Equals(".unity", StringComparison.CurrentCultureIgnoreCase) ? "unity3d" : "assetbundle";

                AssetImporter importer = AssetImporter.GetAtPath(newPath);
                importer.SetAssetBundleNameAndVariant(fileName, variant);
                importer.SaveAndReimport();
            }
        }

        private void CopyToStreamingAssets()
        {
            string toPath = Application.streamingAssetsPath;
            string tartgetPath = BudleToolConfig.m_savePath + "/" + _buildTarget.ToString();
            CopyDirectory(tartgetPath, toPath,true);
            AssetDatabase.Refresh();
        }

        /// <summary>
        /// 创建版本文件
        /// </summary>
        private void OnCreateVersionText()
        {
            string strVersionJsonPath = $"{BudleToolConfig.m_savePath}/{_buildTarget.ToString()}/VersionFile.json";
            versionDatas.Clear();
            if (File.Exists(strVersionJsonPath))
                File.Delete(strVersionJsonPath);

            StringBuilder sbContent = new StringBuilder();

            DirectoryInfo directory = new DirectoryInfo(BudleToolConfig.m_savePath);
            FileInfo[] arrfiles = directory.GetFiles("*", SearchOption.AllDirectories);
            for (int i = 0; i < arrfiles.Length; i++)
            {
                FileInfo file = arrfiles[i];

                string fullName = file.FullName;
                string md5 = GetFileMD5(fullName);
                if (md5 == null) continue;

                string subPath = $"{BudleToolConfig.m_savePath}/{_buildTarget.ToString()}";
                versionDatas.Add(new VersionDataEntity()
                {
                    m_fullName = fullName.Substring(fullName.IndexOf(subPath) + subPath.Length + 2),
                    m_md5 = md5,
                    m_size = Mathf.Ceil(file.Length / 1024.0f)
                });
            }

            WriteJsonData(versionDatas, strVersionJsonPath);
        }

        private void OnDisable()
        {
            EditorUtility.SetDirty(_list);
            EditorUtility.SetDirty(BudleToolConfig);
            AssetDatabase.SaveAssets();
        }

        public string GetAbsolutePath(string path)
        {
            string _path = Application.dataPath.Remove(Application.dataPath.LastIndexOf('/') + 1);
            return _path + path;
        }

        /// <summary>
        /// 拷贝文件夹
        /// </summary>
        /// <param name="sourceDirName"></param>
        /// <param name="destDirName"></param>
        /// <param name="isOverlay">是否覆盖已有同名文件</param>
        public void CopyDirectory(string sourceDirName, string destDirName, bool isOverlay = false)
        {
            try
            {
                if (!Directory.Exists(destDirName))
                {
                    Directory.CreateDirectory(destDirName);
                    File.SetAttributes(destDirName, File.GetAttributes(sourceDirName));
                }

                if (destDirName[destDirName.Length - 1] != Path.DirectorySeparatorChar)
                    destDirName = destDirName + Path.DirectorySeparatorChar;

                string[] files = Directory.GetFiles(sourceDirName);
                foreach (string file in files)
                {
                    if (File.Exists(destDirName + Path.GetFileName(file)) && !isOverlay)
                        continue;
                    FileInfo fileInfo = new FileInfo(file);
                    if (fileInfo.Extension.Equals(".meta", StringComparison.CurrentCultureIgnoreCase))
                        continue;

                    File.Copy(file, destDirName + Path.GetFileName(file), true);
                    File.SetAttributes(destDirName + Path.GetFileName(file), FileAttributes.Normal);
                }

                string[] dirs = Directory.GetDirectories(sourceDirName);
                foreach (string dir in dirs)
                {
                    CopyDirectory(dir, destDirName + Path.GetFileName(dir), isOverlay);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 写入数据
        /// </summary>
        /// <param name="data">数据</param>
        /// <param name="path">文件完整路径</param>
        public static void WriteJsonData(object data, string path)
        {
            string json = JsonMapper.ToJson(data);
            using (StreamWriter sw = new StreamWriter(path))
            {
                //保存数据
                sw.WriteLine(json);
                //关闭文档
                sw.Close();
                sw.Dispose();
            }
        }

        /// <summary>
        /// 获取文件MD5
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static string GetFileMD5(string filePath)
        {
            if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
                return null;

            try
            {
                FileStream file = new FileStream(filePath, FileMode.Open);
                MD5 mD5 = new MD5CryptoServiceProvider();
                byte[] byteResult = mD5.ComputeHash(file);
                string strResult = BitConverter.ToString(byteResult);
                strResult = strResult.Replace("-", "");
                return strResult;
            }
            catch
            {
                return null;
            }
        }
    }
}