using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using UnityEditor;
using YooAsset.Editor;
using static UnityEditor.Progress;

namespace GFGEditor
{
    public static class AssetBundleHelper
    {
        public const string RES_ROOT_DIR_PATH = "Assets/Res";
        public const int LimitByteSize = 1024*1024*4;
        private static List<string> excludeFileExtensions = new List<string>() { ".meta", ".moc3" , ".can3" };


        private static AssetBundleCollector assetBundleCollector;
        private static AssetBundleCollectRuler _ruler;
        private static AssetBundleCollectRuler ruler
        {
            get
            {
                if(_ruler == null)
                {
                    _ruler = AssetBundleCollectRuler.GetData();
                }
                return _ruler;
            }
        }
        private static Dictionary<string, Dictionary<string, AssetBundleAssetListItem>> itemsSizeDicDic;

        //记录文件的bundle名
        private static Dictionary<string, string> fileBundleDic;

        public static void OnPreExecuteBuild()
        {
            EditorUtility.DisplayProgressBar("进度", "正在收集资源", 1);
            itemsSizeDicDic = new Dictionary<string, Dictionary<string, AssetBundleAssetListItem>>();
            assetBundleCollector = AssetBundleCollector.GetData();
            
            foreach (var dir in ruler.PackBySeparately)
            {
                FileHelper.ForeachFileInDir(dir, null, (string filePath) =>
                {
                    var path = filePath.Replace("\\", "/");
                    var ext = Path.GetExtension(filePath);
                    if(IsIgnoreFileExtension(ext))
                    {
                        return;
                    }
                    var dirPath = dir + "/";
                    if (path.Contains(dirPath))
                    {
                        var indexLastDot = path.LastIndexOf('.');
                        string key = path.Substring(0, indexLastDot);
                        CollectDynamicFile(dir, key, path);
                    }
                });
            }
            foreach (var dir in ruler.PackByTopDir)
            {
                FileHelper.ForeachFileInDir(dir, null, (string filePath) =>
                {
                    var path = filePath.Replace("\\", "/");
                    var ext = Path.GetExtension(filePath);
                    if (IsIgnoreFileExtension(ext))
                    {
                        return;
                    }
                    var dirPath = dir + "/";
                    if (path.Contains(dirPath))
                    {
                        var topPath = path.Replace(dir + "/", "");
                        var arr = topPath.Split('/');
                        string key = dir + "/" + arr[0];
                        CollectDynamicFile(dir, key, path);
                    }
                });
            }
            CollectNewItems();
            RecordFileBundle();
            EditorUtility.SetDirty(assetBundleCollector);
            AssetDatabase.SaveAssetIfDirty(assetBundleCollector);
            EditorUtility.ClearProgressBar();
        }

        public static void OnPostExecuteBuild()
        {
            if(fileBundleDic != null)
            {
                fileBundleDic.Clear();
                fileBundleDic = null;
            }
            if(itemsSizeDicDic != null)
            {
                itemsSizeDicDic.Clear();
                itemsSizeDicDic = null;
            }
            assetBundleCollector = null;
            _ruler = null;
        }

        public static void CollectDynamicFile(string dirPath, string itemKey, string assetPath)
        {
            AssetBundleAssetList assetList;
            AssetBundleAssetListItem newItem;
            Dictionary<string, AssetBundleAssetListItem> itemsSizeDic;
            for (var i = 0; i < assetBundleCollector.assetBundleAssetLists.Count; i++)
            {
                assetList = assetBundleCollector.assetBundleAssetLists[i];
                if (assetList.dir == dirPath)
                {
                    foreach(var item in assetList.list)
                    {
                        if(item.key == itemKey)
                        {
                            //新增文件直接加进去
                            if (!item.list.Contains(assetPath))
                            {
                                item.list.Add(assetPath);
                                var fileSize = GetFileSize(assetPath);
                                item.bytes += fileSize;
                                assetList.bytes += fileSize;
                                if (assetList.bytes >= LimitByteSize)
                                {
                                    assetList.status = 1;
                                }
                            }
                            return;
                        }
                    }
                }
            }
            //先计算每个item的大小缓存起来（item指必须打在一起的若干文件）
            itemsSizeDicDic.TryGetValue(dirPath, out itemsSizeDic);
            if (itemsSizeDic == null)
            {
                itemsSizeDic = new Dictionary<string, AssetBundleAssetListItem>();
                itemsSizeDicDic[dirPath] = itemsSizeDic;
            }
            itemsSizeDic.TryGetValue(itemKey, out newItem);
            if (newItem == null)
            {
                newItem = new AssetBundleAssetListItem();
                newItem.key = itemKey;
                newItem.list = new List<string>();
                itemsSizeDic[itemKey] = newItem;
            }
            newItem.list.Add(assetPath);
            newItem.bytes += GetFileSize(assetPath);
        }

        public static void CollectNewItems()
        {
            foreach(var t in itemsSizeDicDic)
            {
                CollectNewItems(t.Key, t.Value);
            }
        }

        public static void CollectNewItems(string dirPath, Dictionary<string, AssetBundleAssetListItem> itemsSizeDic)
        {
            foreach(var newItem in itemsSizeDic.Values)
            {
                bool toNew = true;
                AssetBundleAssetList assetList;
                //先找已存在的AB
                for (var i = 0; i < assetBundleCollector.assetBundleAssetLists.Count; i++)
                {
                    assetList = assetBundleCollector.assetBundleAssetLists[i];
                    if (assetList.dir == dirPath)
                    {
                        if (assetList.status <= 0)
                        {
                            if (assetList.bytes < LimitByteSize && newItem.bytes < LimitByteSize)
                            {
                                assetList.list.Add(newItem);
                                assetList.bytes += newItem.bytes;
                                if (assetList.bytes >= LimitByteSize)
                                {
                                    assetList.status = 1;
                                }
                                toNew = false;
                            }
                        }
                    }
                }
                if(toNew)
                {
                    //新建一个AB
                    assetList = new AssetBundleAssetList();
                    assetList.dir = dirPath;
                    assetList.list = new List<AssetBundleAssetListItem>();
                    assetList.list.Add(newItem);
                    assetList.bytes += newItem.bytes;
                    if (assetList.bytes >= LimitByteSize)
                    {
                        assetList.status = 1;
                    }
                    assetBundleCollector.assetBundleAssetLists.Add(assetList);
                }
            }
        }
        private static void RecordFileBundle()
        {
            fileBundleDic = new Dictionary<string, string>();
            AssetBundleAssetList assetList;
            for (var i = 0; i < assetBundleCollector.assetBundleAssetLists.Count; i++)
            {
                assetList = assetBundleCollector.assetBundleAssetLists[i];
                foreach (var item in assetList.list)
                {
                    foreach (var assetPath in item.list)
                    {
                        var bundleName = assetList.dir + "_" + i;
                        fileBundleDic[assetPath] = bundleName;
                        //UnityEngine.Debug.Log($"assetPath  ：{assetPath}");
                        //UnityEngine.Debug.Log($"bundleName ：{bundleName}");
                    }
                }
            }
        }

        public static int GetFileSize(string filePath)
        {
            //var filePath = Path.Combine(Environment.CurrentDirectory, assetPath);
            //filePath = filePath.Replace("\\", "/");
            var ext = Path.GetExtension(filePath);
            byte[] bytes = File.ReadAllBytes(filePath);
            var fileSize = bytes.Length;
            if (ext == ".jpg")
            {
                //unity处理jpg后会变的很大
                fileSize *= 5;
            }
            return fileSize;
        }

        public static string GetBundleName(string assetPath)
        {
            var path = assetPath.Replace("\\", "/");

            foreach (var dir in ruler.PackByCollecter)
            {
                var dirPath = dir + "/";
                if (path.Contains(dirPath))
                {
                    return dir;
                }
            }
            string bundleName = null;
            if (fileBundleDic != null)
            {
                fileBundleDic.TryGetValue(assetPath, out bundleName);
            }
            return bundleName;
        }

        public static bool IsIgnoreFileExtension(string extension)
        {
            return excludeFileExtensions.Contains(extension);
        }
    }
}