using CaoCao.XAsset;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using UnityEditor;

namespace CaoCao.Editor
{
    public class BuildBundles : IBuildJobStep
    {
        private static bool _bXor = false;  //是否需要加密
        private static string[] _xorList = new string[] { "hotfixb_win", "hotfixb_ios", "hotfixb_android" };

        public void Start(BuildJob job)
        {
            if (job.bundledAssets.Count > 0)
                if (!BuildBundlesWithBundledAssets(job))
                    return;

            if (job.rawAssets.Count == 0) 
                return;

            BuildBundlesWithRawAssets(job);
        }

        //"E:/HxMobileProject/Bundles/Android/hotfix/gamehotfix_game_hotfix_1724706769b660e9bb10348d54791798.bundle"
        private static void BuildBundlesWithRawAssets(BuildJob job)
        {
            var settings = Settings.GetDefaultSettings().bundle;
            if (settings.saveBundleName)
            {
                foreach (var asset in job.rawAssets)
                {
                    if (string.IsNullOrEmpty(asset.path))
                    {
                        Logger.E($"RawAsset not found:{asset.path}");
                        continue;
                    }

                    var file = new FileInfo(asset.path);
                    var hash = XAsset.Utility.ComputeHash(asset.path);
                    var nameWithAppendHash = $"{hash}{Settings.extension}";
                    var name = asset.bundle.Replace(Settings.extension, string.Empty);
                    nameWithAppendHash = $"{name}_{nameWithAppendHash}";
                    var bundle = new BuildBundle
                    {
                        group = asset.bundle,
                        hash = hash,
                        file = nameWithAppendHash,
                        assets = new List<string> {asset.path},
                        size = (ulong) file.Length,
                        raw = true
                    };

                    var path = Settings.GetDataPath(bundle.file);
                    XAsset.Utility.CreateDirectoryIfNecessary(path);
                    //把"Assets/GameAssets/GameHotfix/game.hotfix" copy 到 bundle目录
                    if (!File.Exists(path)) 
                        file.CopyTo(path, true);

                    job.bundles.Add(bundle);
                }
            }
            else
            {
                foreach (var asset in job.rawAssets)
                {
                    if (string.IsNullOrEmpty(asset.path))
                    {
                        Logger.E($"RawAsset not found:{asset.path}");
                        continue;
                    }

                    var file = new FileInfo(asset.path);
                    var hash = XAsset.Utility.ComputeHash(asset.path);
                    var nameWithAppendHash = $"{hash}{Settings.extension}";
                    var bundle = new BuildBundle
                    {
                        group = asset.bundle,
                        hash = hash,
                        file = nameWithAppendHash,
                        assets = new List<string> {asset.path},
                        size = (ulong) file.Length,
                        raw = true
                    };

                    var path = Settings.GetDataPath(bundle.file);
                    XAsset.Utility.CreateDirectoryIfNecessary(path);

                    if (!File.Exists(path)) 
                        file.CopyTo(path, true);

                    job.bundles.Add(bundle);
                }
            }
        }

        private static bool BuildWithEncodeFunc(BuildJob job, IReadOnlyDictionary<string, BuildBundle> nameWithBundles,
            IAssetBundleManifest manifest, Func<string, string, string, ulong> encodeFunc)
        {
            var settings = Settings.GetDefaultSettings().bundle;
            var assetBundles = manifest.GetAllAssetBundles();
            foreach (var assetBundle in assetBundles)
                if (nameWithBundles.TryGetValue(assetBundle, out var bundle))
                {
                    var path = Settings.GetCachePath(assetBundle);
                    bundle.deps = Array.ConvertAll(manifest.GetAllDependencies(assetBundle), input => nameWithBundles[input].id);
                    var info = new FileInfo(path);
                    if (info.Exists)
                    {
                        var hash = XAsset.Utility.ComputeHash(path);
                        var nameWithAppendHash = $"{hash}{Settings.extension}";
                        //"E:/HxMobileProject/BundlesCache/Android/b9d3a695563b75faf8b40843773a6262.bundle"
                        var buildPath = Settings.GetCachePath(nameWithAppendHash);
                        bundle.size = encodeFunc(path, hash, buildPath);
                        bundle.hash = XAsset.Utility.ComputeHash(buildPath);
                        bundle.file = $"{bundle.hash}{Settings.extension}";
                        if (settings.saveBundleName)
                        {
                            var name = assetBundle.Replace(Settings.extension, string.Empty);
                            bundle.file = $"{name}_{bundle.file}";
                        }

                        //"E:/HxMobileProject/Bundles/Android/assetspackb/common_asset_490b592d96dff85f5898c860db836145.bundle"
                        var newPath = Settings.GetDataPath(bundle.file);
                        XAsset.Utility.CreateDirectoryIfNecessary(newPath);
                        if (File.Exists(newPath)) 
                            File.Delete(newPath);

                        File.Move(buildPath, newPath);
                    }
                    else
                    {
                        job.TreatError($"File not found: {info}");
                        return false;
                    }
                }
                else
                {
                    job.TreatError($"Bundle not found: {assetBundle}");
                    return false;
                }

            return true;
        }

        private static ulong EncodeWithoutEncryption(string path, string hash, string newPath)
        {
            var bytes = File.ReadAllBytes(path);
            var size = bytes.Length;
            XAsset.Utility.CreateDirectoryIfNecessary(newPath);
            using (var writer = new BinaryWriter(File.OpenWrite(newPath)))
            {
                writer.Write(File.ReadAllBytes(path));
            }

            return (ulong) size;
        }

        private static ulong EncodeWithEncryption(string path, string hash, string newPath)
        {
            string pattern = @"\d+_texture"; // 正则表达式模式
            //判断是否需要加密
            bool bXor = false;

            foreach(var p in _xorList)
            {
                if(path.Contains(p))
                {
                    bXor = true;
                    break;
                }
            }

#if ENABLE_NEWENCRY //@取消贴图加密
            //不加密此处无代码
#else
            if (!bXor)
            {
                MatchCollection matches = Regex.Matches(path, pattern);
                if (matches.Count > 0)
                    bXor = true;
            }
#endif

            var bytes = File.ReadAllBytes(path);
            if (bXor)
            {
                byte[] hashBytes = System.Text.Encoding.UTF8.GetBytes(hash);
                XAsset.Utility.GetSelfXorBytes(bytes, hashBytes);
                UnityEngine.Debug.Log($"加密：{path}");
            }

            ulong size = XAsset.Utility.WriteOffset + (ulong)bytes.Length;
            XAsset.Utility.CreateDirectoryIfNecessary(newPath);

            using (var writer = new BinaryWriter(File.OpenWrite(newPath)))
            {
                writer.Write(hash);
                writer.Write(bytes);
            }

            return size;
        }

        private static IAssetBundleManifest BuildAssetBundles(BuildJob job)
        {
            if (Builder.BuildPipeline != null)
                return Builder.BuildPipeline.BuildAssetBundles(Settings.PlatformCachePath, job.bundles.ConvertAll(
                    input =>
                        new AssetBundleBuild
                        {
                            assetNames = input.assets.ToArray(),
                            assetBundleName = input.group
                        }).ToArray(), job.parameters.options, EditorUserBuildSettings.activeBuildTarget);

            job.TreatError("Pipeline == null");
            return null;
        }

        private static bool BuildBundlesWithBundledAssets(BuildJob job)
        {
            var nameWithBundles = job.bundles.ToDictionary(o => o.group);
            foreach (var asset in job.bundledAssets)
            {
                if (!nameWithBundles.TryGetValue(asset.bundle, out var bundle))
                {
                    var id = job.bundles.Count;
                    bundle = new BuildBundle
                    {
                        id = id,
                        group = asset.bundle,
                        assets = new List<string>()
                    };
                    job.bundles.Add(bundle);
                    nameWithBundles[asset.bundle] = bundle;
                }

                bundle.assets.Add(asset.path);
            }

            var manifest = BuildAssetBundles(job);
            if (manifest == null)
            {
                job.TreatError($"Failed to build AssetBundles with {job.parameters.name}.");
                return false;
            }

            var settings = Settings.GetDefaultSettings();
            if (settings.bundle.encryption)
            {
                if (!BuildWithEncodeFunc(job, nameWithBundles, manifest, EncodeWithEncryption)) 
                    return false;
            }
            else
            {
                if (!BuildWithEncodeFunc(job, nameWithBundles, manifest, EncodeWithoutEncryption)) 
                    return false;
            }

            return true;
        }


    }
}