using AssetStudio;
using AssetStudioCLI.Options;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml.Linq;
using static AssetStudioCLI.Exporter;
using Ansi = AssetStudioCLI.CLIAnsiColors;

namespace AssetStudioCLI
{
    internal class Studio
    {
        public AssetsManager assetsManager = new AssetsManager();
        public List<AssetItem> parsedAssetsList = new List<AssetItem>();
        private readonly CLIOptions options;

        public Studio(CLIOptions cliOptions) 
        {
            Progress.Default = new Progress<int>(ShowCurProgressValue);
            options = cliOptions;
        }

        private void ShowCurProgressValue(int value)
        {
            Console.Write($"[{value:000}%]\r");
        }

        public bool LoadAssets()
        {
            var isLoaded = false;
            assetsManager.SpecifyUnityVersion = options.o_unityVersion.Value;
            assetsManager.SetAssetFilter(options.o_exportAssetTypes.Value);

            if (Directory.Exists(options.inputPath))
            {
                assetsManager.LoadFolder(options.inputPath);
            }
            else
            {
                assetsManager.LoadFiles(options.inputPath);
            }
            if (assetsManager.assetsFileList.Count == 0)
            {
                Logger.Warning("No Unity file can be loaded.");
            }
            else
            {
                isLoaded = true;
            }

            return isLoaded;
        }

        public void ParseAssets()
        {
            Logger.Info("Parse assets...");

            var fileAssetsList = new List<AssetItem>();
            var containers = new Dictionary<AssetStudio.Object, string>();
            var objectCount = assetsManager.assetsFileList.Sum(x => x.Objects.Count);

            Progress.Reset();
            var i = 0;
            foreach (var assetsFile in assetsManager.assetsFileList)
            {
                foreach (var asset in assetsFile.Objects)
                {
                    var assetItem = new AssetItem(asset);
                    assetItem.UniqueID = "_#" + i;
                    var isExportable = false;
                    switch (asset)
                    {
                        case AssetBundle m_AssetBundle:
                            foreach (var m_Container in m_AssetBundle.m_Container)
                            {
                                var preloadIndex = m_Container.Value.preloadIndex;
                                var preloadSize = m_Container.Value.preloadSize;
                                var preloadEnd = preloadIndex + preloadSize;
                                for (int k = preloadIndex; k < preloadEnd; k++)
                                {
                                    var pptr = m_AssetBundle.m_PreloadTable[k];
                                    if (pptr.TryGet(out var obj))
                                    {
                                        containers[obj] = m_Container.Key;
                                    }
                                }
                            }
                            break;
                        case ResourceManager m_ResourceManager:
                            foreach (var m_Container in m_ResourceManager.m_Container)
                            {
                                if (m_Container.Value.TryGet(out var obj))
                                {
                                    containers[obj] = m_Container.Key;
                                }
                            }
                            break;
                        case Texture2D m_Texture2D:
                            if (!string.IsNullOrEmpty(m_Texture2D.m_StreamData?.path))
                                assetItem.FullSize = asset.byteSize + m_Texture2D.m_StreamData.size;
                            assetItem.Text = m_Texture2D.m_Name;
                            break;
                        case AudioClip m_AudioClip:
                            if (!string.IsNullOrEmpty(m_AudioClip.m_Source))
                                assetItem.FullSize = asset.byteSize + m_AudioClip.m_Size;
                            assetItem.Text = m_AudioClip.m_Name;
                            break;
                        case VideoClip m_VideoClip:
                            if (!string.IsNullOrEmpty(m_VideoClip.m_OriginalPath))
                                assetItem.FullSize = asset.byteSize + m_VideoClip.m_ExternalResources.m_Size;
                            assetItem.Text = m_VideoClip.m_Name;
                            break;
                        case MovieTexture _:
                        case TextAsset _:
                        case Font _:
                        case Sprite _:
                            assetItem.Text = ((NamedObject)asset).m_Name;
                            break;
                        case Shader m_Shader:
                            assetItem.Text = m_Shader.m_ParsedForm?.m_Name ?? m_Shader.m_Name;
                            break;
                        case MonoBehaviour m_MonoBehaviour:
                            if (m_MonoBehaviour.m_Name == "" && m_MonoBehaviour.m_Script.TryGet(out var m_Script))
                            {
                                assetItem.Text = m_Script.m_ClassName;
                            }
                            else
                            {
                                assetItem.Text = m_MonoBehaviour.m_Name;
                            }
                            break;
                    }
                    if (assetItem.Text == "")
                    {
                        assetItem.Text = assetItem.TypeString + assetItem.UniqueID;
                    }

                    isExportable = options.o_exportAssetTypes.Value.Contains(asset.type);
                    if (isExportable)
                    {
                        fileAssetsList.Add(assetItem);
                    }

                    Progress.Report(++i, objectCount);
                }
                foreach (var asset in fileAssetsList)
                {
                    if (containers.ContainsKey(asset.Asset))
                    {
                        asset.Container = containers[asset.Asset];
                    }
                }
                parsedAssetsList.AddRange(fileAssetsList);
                containers.Clear();
                fileAssetsList.Clear();
            }
        }

        public void ShowExportableAssetsInfo()
        {
            var exportableAssetsCountDict = new Dictionary<ClassIDType, int>();
            if (parsedAssetsList.Count > 0)
            {
                foreach (var asset in parsedAssetsList)
                {
                    if (exportableAssetsCountDict.ContainsKey(asset.Type))
                    {
                        exportableAssetsCountDict[asset.Type] += 1;
                    }
                    else
                    {
                        exportableAssetsCountDict.Add(asset.Type, 1);
                    }
                }

                var info = "\n[Exportable Assets Count]\n";
                foreach (var assetType in exportableAssetsCountDict.Keys)
                {
                    info += $"# {assetType}: {exportableAssetsCountDict[assetType]}\n";
                }
                if (exportableAssetsCountDict.Count > 1)
                {
                    info += $"#\n# Total: {parsedAssetsList.Count} assets";
                }

                if (options.o_logLevel.Value > LoggerEvent.Info)
                {
                    Console.WriteLine(info);
                }
                else
                {
                    Logger.Info(info);
                }
            }
        }

        public void FilterAssets()
        {
            var assetsCount = parsedAssetsList.Count;
            var filteredAssets = new List<AssetItem>();

            switch(options.filterBy)
            {
                case FilterBy.Name:
                    filteredAssets = parsedAssetsList.FindAll(x => options.o_filterByName.Value.Any(y => x.Text.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0));
                    Logger.Info(
                        $"Found [{filteredAssets.Count}/{assetsCount}] asset(s) " +
                        $"that contain {$"\"{string.Join("\", \"", options.o_filterByName.Value)}\"".Color(Ansi.BrightYellow)} in their Names."
                    );
                    break;
                case FilterBy.Container:
                    filteredAssets = parsedAssetsList.FindAll(x => options.o_filterByContainer.Value.Any(y => x.Container.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0));
                    Logger.Info(
                        $"Found [{filteredAssets.Count}/{assetsCount}] asset(s) " +
                        $"that contain {$"\"{string.Join("\", \"", options.o_filterByContainer.Value)}\"".Color(Ansi.BrightYellow)} in their Containers."
                    );
                    break;
                case FilterBy.PathID:
                    filteredAssets = parsedAssetsList.FindAll(x => options.o_filterByPathID.Value.Any(y => x.m_PathID.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0));
                    Logger.Info(
                        $"Found [{filteredAssets.Count}/{assetsCount}] asset(s) " +
                        $"that contain {$"\"{string.Join("\", \"", options.o_filterByPathID.Value)}\"".Color(Ansi.BrightYellow)} in their PathIDs."
                    );
                    break;
                case FilterBy.NameOrContainer:
                    filteredAssets = parsedAssetsList.FindAll(x =>
                        options.o_filterByText.Value.Any(y => x.Text.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0) ||
                        options.o_filterByText.Value.Any(y => x.Container.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0)
                    );
                    Logger.Info(
                        $"Found [{filteredAssets.Count}/{assetsCount}] asset(s) " +
                        $"that contain {$"\"{string.Join("\", \"", options.o_filterByText.Value)}\"".Color(Ansi.BrightYellow)} in their Names or Contaniers."
                    );
                    break;
                case FilterBy.NameAndContainer:
                    filteredAssets = parsedAssetsList.FindAll(x =>
                        options.o_filterByName.Value.Any(y => x.Text.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0) &&
                        options.o_filterByContainer.Value.Any(y => x.Container.ToString().IndexOf(y, StringComparison.OrdinalIgnoreCase) >= 0)
                    );
                    Logger.Info(
                        $"Found [{filteredAssets.Count}/{assetsCount}] asset(s) " +
                        $"that contain {$"\"{string.Join("\", \"", options.o_filterByContainer.Value)}\"".Color(Ansi.BrightYellow)} in their Containers " +
                        $"and {$"\"{string.Join("\", \"", options.o_filterByName.Value)}\"".Color(Ansi.BrightYellow)} in their Names."
                    );
                    break;
            }
            parsedAssetsList.Clear();
            parsedAssetsList = filteredAssets;
        }

        public void ExportAssets()
        {
            var savePath = options.o_outputFolder.Value;
            var toExportCount = parsedAssetsList.Count;
            var exportedCount = 0;

            foreach (var asset in parsedAssetsList)
            {
                string exportPath;
                switch (options.o_groupAssetsBy.Value)
                {
                    case AssetGroupOption.TypeName:
                        exportPath = Path.Combine(savePath, asset.TypeString);
                        break;
                    case AssetGroupOption.ContainerPath:
                        if (!string.IsNullOrEmpty(asset.Container))
                        {
                            exportPath = Path.Combine(savePath, Path.GetDirectoryName(asset.Container));
                        }
                        else
                        {
                            exportPath = savePath;
                        }
                        break;
                    case AssetGroupOption.SourceFileName:
                        if (string.IsNullOrEmpty(asset.SourceFile.originalPath))
                        {
                            exportPath = Path.Combine(savePath, asset.SourceFile.fileName + "_export");
                        }
                        else
                        {
                            exportPath = Path.Combine(savePath, Path.GetFileName(asset.SourceFile.originalPath) + "_export", asset.SourceFile.fileName);
                        }
                        break;
                    default:
                        exportPath = savePath;
                        break;
                }

                exportPath += Path.DirectorySeparatorChar;
                try
                {
                    switch (options.o_workMode.Value)
                    {
                        case WorkMode.ExportRaw:
                            Logger.Debug($"{options.o_workMode}: {asset.Type} : {asset.Container} : {asset.Text}");
                            if (ExportRawFile(asset, exportPath))
                            {
                                exportedCount++;
                            }
                            break;
                        case WorkMode.Dump:
                            Logger.Debug($"{options.o_workMode}: {asset.Type} : {asset.Container} : {asset.Text}");
                            if (ExportDumpFile(asset, exportPath, options))
                            {
                                exportedCount++;
                            }
                            break;
                        case WorkMode.Export:
                            Logger.Debug($"{options.o_workMode}: {asset.Type} : {asset.Container} : {asset.Text}");
                            if (ExportConvertFile(asset, exportPath, options))
                            {
                                exportedCount++;
                            }
                            break;
                    }
                }
                catch (Exception ex)
                {
                    Logger.Error($"{asset.SourceFile.originalPath}: [{$"{asset.Type}: {asset.Text}".Color(Ansi.BrightRed)}] : Export error\n{ex}");
                }
                Console.Write($"Exported [{exportedCount}/{toExportCount}]\r");
            }
            Console.WriteLine("");

            if (exportedCount == 0)
            {
                Logger.Info("Nothing exported.");
            }
            else if (toExportCount > exportedCount)
            {
                Logger.Info($"Finished exporting {exportedCount} asset(s) to \"{options.o_outputFolder.Value.Color(Ansi.BrightYellow)}\".");
            }
            else
            {
                Logger.Info($"Finished exporting {exportedCount} asset(s) to \"{options.o_outputFolder.Value.Color(Ansi.BrightGreen)}\".");
            }

            if (toExportCount > exportedCount)
            {
                Logger.Info($"{toExportCount - exportedCount} asset(s) skipped (not extractable or file(s) already exist).");
            }
        }

        public void ExportAssetList()
        {
            var savePath = options.o_outputFolder.Value;

            switch (options.o_exportAssetList.Value)
            {
                case ExportListType.XML:
                    var filename = Path.Combine(savePath, "assets.xml");
                    var doc = new XDocument(
                        new XElement("Assets",
                            new XAttribute("filename", filename),
                            new XAttribute("createdAt", DateTime.UtcNow.ToString("s")),
                            parsedAssetsList.Select(
                                asset => new XElement("Asset",
                                    new XElement("Name", asset.Text),
                                    new XElement("Container", asset.Container),
                                    new XElement("Type", new XAttribute("id", (int)asset.Type), asset.TypeString),
                                    new XElement("PathID", asset.m_PathID),
                                    new XElement("Source", asset.SourceFile.fullName),
                                    new XElement("Size", asset.FullSize)
                                )
                            )
                        )
                    );
                    doc.Save(filename);

                   break;
            }
            Logger.Info($"Finished exporting asset list with {parsedAssetsList.Count} items.");
        }
    }
}