using CaoCao.XAsset;
using System;
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using UnityEngine;

namespace CaoCao.Editor
{
    public class BuildPlayerAssets : IPreprocessBuildWithReport, IPostprocessBuildWithReport
    {
        //打包后自动调用
        public void OnPostprocessBuild(BuildReport report)
        {
            var dataPath = $"{Application.streamingAssetsPath}/{Assets.Bundles}";
            if (!Directory.Exists(dataPath)) 
                return;

            FileUtil.DeleteFileOrDirectory(dataPath);
            FileUtil.DeleteFileOrDirectory(dataPath + ".meta");

            if (Directory.GetFiles(Application.streamingAssetsPath).Length != 0)
                return;

            FileUtil.DeleteFileOrDirectory(Application.streamingAssetsPath);
            FileUtil.DeleteFileOrDirectory(Application.streamingAssetsPath + ".meta");
        }

        public int callbackOrder { get; }

        //打包前自动调用
        public void OnPreprocessBuild(BuildReport report)
        {
            StartNew();
        }

        public static Action<BuildPlayerAssets> CustomBuilder { get; set; }
        private Versions versions { get; set; }

        public static void StartNew(Versions versions = null)
        {
            new BuildPlayerAssets {versions = versions}.Start();
        }

        private void Start()
        {
            //从BuildCache中读取versions.json
            if (versions == null) 
                versions = Settings.GetDefaultVersions();

            if (CustomBuilder != null)
            {
                CustomBuilder.Invoke(this);
                return;
            }

            var dataPath = $"{Application.streamingAssetsPath}/{Assets.Bundles}";
            var settings = Settings.GetDefaultSettings();
            if (Settings.Platform == Platform.iOS)
            {
                // iOS 下散文件 IO 效率更高
                settings.packPlayerAssets = false;
            }

            var playerAssets = settings.GetPlayerAssets();

            if (Directory.Exists(dataPath))
            {
                FileUtil.DeleteFileOrDirectory(dataPath);
                FileUtil.DeleteFileOrDirectory($"{dataPath}.meta");
            }

            //根据versions获取到设置为交付模式为Install Time的bundle包
            var bundles = Builder.GetBundlesInBuild(settings, versions);
            if (bundles.Length > 0)
                CopyBundles(bundles, playerAssets, settings.bundle.encryption ? XAsset.Utility.WriteOffset : 0);

            // 保存版本文件
            foreach (var version in versions.data)
            {
                ////分包版本文件不加入包中
                //if (version.subPackage)
                //    continue;

                var from = Settings.GetDataPath(version.file);
                var to = Assets.GetPlayerDataPath(version.file);
                XAsset.Utility.CreateDirectoryIfNecessary(to);
                File.Copy(from, to, true);
            }

            // WebGL 不需要搞 PlayerAssets。
            if (Settings.Platform == Platform.WebGL)
                playerAssets.data.Clear();

            var json = JsonUtility.ToJson(playerAssets);
            // 将playerassets.json文件写入streamingAssetsPath文件夹
            var path = Assets.GetPlayerDataPath(PlayerAssets.Filename);
            XAsset.Utility.CreateDirectoryIfNecessary(path);
            File.WriteAllText(path, json);
            // 将version.json文件写入streamingAssetsPath文件夹
            path = Assets.GetPlayerDataPath(Versions.Filename);
            XAsset.Utility.CreateDirectoryIfNecessary(path);
            versions.Save(path);
        }

        //TODO:带修改，加密
        private static void CopyBundles(IEnumerable<ManifestBundle> bundles, PlayerAssets playerAssets,
            ulong offset = 0)
        {
            bool bXor = false;
            if (!playerAssets.packed)
            {
                foreach (var bundle in bundles)
                {
                    bXor = false;
                    var from = Settings.GetDataPath(bundle.file);
                    var to = Assets.GetPlayerDataPath(bundle.file);
                    var file = new FileInfo(from);
                    if (file.Exists)
                    {
#if ENABLE_NEWENCRY //@取消贴图加密
                        //不加密
                        XAsset.Utility.CreateDirectoryIfNecessary(to);
                        file.CopyTo(to, true);
                        playerAssets.data.Add(PackedAsset.Create(bundle, offset));
#else
                        if (bundle.file.Contains("1_texture"))
                            bXor = true;

                        if (!bXor)
                        {
                            XAsset.Utility.CreateDirectoryIfNecessary(to);
                            file.CopyTo(to, true);
                            playerAssets.data.Add(PackedAsset.Create(bundle, offset));
                        }
                        else
                        {
                            //把以加密的数据解密回来
                            using (var writer = new BinaryWriter(File.OpenWrite(to)))
                            {
                                var stream = File.OpenRead(from);
                                using var reader = new BinaryReader(stream);
                                string hash = reader.ReadString();
                                byte[] hashBytes = System.Text.Encoding.UTF8.GetBytes(hash);
                                //读取剩余数据
                                ulong len = (ulong)stream.Length - offset;
                                var bytes = reader.ReadBytes((int)len);
                                XAsset.Utility.GetSelfXorBytes(bytes, hashBytes);
                                writer.Write(hash);
                                writer.Write(bytes);
                                reader.Close();
                            }
                        }
#endif


                    }
                    else
                    {
                        XAsset.Logger.E($"File not found: {from}");
                    }
                }
            }
            else
            {
                var path = Assets.GetPlayerDataPath(playerAssets.GetAssetName());
                if (File.Exists(path))
                {
                    File.Delete(path);
                }

                XAsset.Utility.CreateDirectoryIfNecessary(path);

                using (var writer = new BinaryWriter(File.OpenWrite(path)))
                {
                    foreach (var bundle in bundles)
                    {
                        bXor = false;
                        var from = Settings.GetDataPath(bundle.file);
                        var file = new FileInfo(from);
                        if (file.Exists)
                        {


#if ENABLE_NEWENCRY //@取消贴图加密
                            playerAssets.data.Add(PackedAsset.Create(bundle, (ulong)writer.BaseStream.Position + offset));
                            writer.Write(File.ReadAllBytes(from));
#else
                            if (bundle.file.Contains("1_texture"))
                                bXor = true;
                            if (!bXor)
                            {
                                playerAssets.data.Add(PackedAsset.Create(bundle, (ulong)writer.BaseStream.Position + offset));
                                writer.Write(File.ReadAllBytes(from));
                            }
                            else
                            {
                                // 安卓下，StreamingAssets内文件不支持C#的IO
                                // 所以把以加密的数据解密回来

                                playerAssets.data.Add(PackedAsset.Create(bundle, (ulong)writer.BaseStream.Position + offset));
                                var stream = File.OpenRead(from);
                                using var reader = new BinaryReader(stream);
                                string hash = reader.ReadString();
                                byte[] hashBytes = System.Text.Encoding.UTF8.GetBytes(hash);

                                //读取剩余数据
                                ulong len = (ulong)stream.Length - offset;
                                var bytes = reader.ReadBytes((int)len);

                                XAsset.Utility.GetSelfXorBytes(bytes, hashBytes);
                                writer.Write(hash);
                                writer.Write(bytes);

                                reader.Close();
                            }
#endif
                        }
                        else
                        {
                            XAsset.Logger.E($"File not found: {from}");
                        }
                    }
                }
            }


#if ENABLE_NEWENCRY //@取消贴图加密
            Debug.Log("是“取消贴图加密”模式");
#else
            Debug.Log("旧模式，非“取消贴图加密”模式");
#endif
        }
    }
}