using CliWrap;
using Microsoft.Extensions.Logging;
using ShellProgressBar;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Text.Json;
using View_by_Distance.Metadata.Models;
using View_by_Distance.Metadata.Models.Stateless;
using View_by_Distance.Shared.Models;
using View_by_Distance.Shared.Models.Properties;
using View_by_Distance.Shared.Models.Stateless;
using View_by_Distance.Windows.Models;

namespace View_by_Distance.Windows;

public partial class Windows : IWindows, IDisposable
{

    private ProgressBar? _ProgressBar;
    private readonly ProgressBarOptions _ProgressBarOptions;

    public Windows(List<string> args, ILogger<Program>? logger, AppSettings appSettings, bool isSilent, IConsole console)
    {
        if (isSilent)
        { }
        if (args is null)
            throw new NullReferenceException(nameof(args));
        if (console is null)
            throw new NullReferenceException(nameof(console));
        IWindows windows = this;
        long ticks = DateTime.Now.Ticks;
        _ProgressBarOptions = new() { ProgressCharacter = '─', ProgressBarOnBottom = true, DisableBottomPercentage = true };
        WindowsWork(logger, appSettings, windows, ticks);
    }

    void IWindows.Tick() =>
        _ProgressBar?.Tick();

    void IWindows.ConstructProgressBar(int maxTicks, string message)
    {
        _ProgressBar?.Dispose();
        _ProgressBar = new(maxTicks, message, _ProgressBarOptions);
    }

    void IDisposable.Dispose()
    {
        _ProgressBar?.Dispose();
        GC.SuppressFinalize(this);
    }

    ReadOnlyCollection<string> IWindows.ConvertAndGetFastForwardMovingPictureExpertsGroupFiles(IWindowsSettings WindowsSettings, HttpClient? httpClient, FilePath filePath)
    {
        List<string> results = [];
        bool isValidVideoFormatExtensions = WindowsSettings.ValidVideoFormatExtensions.Contains(filePath.ExtensionLowered);
        if (isValidVideoFormatExtensions)
        {
            bool check;
            try
            {
                CommandTask<CommandResult> commandTask = Cli.Wrap("L:/Git/ffmpeg-2024-10-02-git-358fdf3083-full_build/bin/ffmpeg.exe")
                    .WithArguments(["-i", filePath.FullName, "-vf", "select=eq(n\\,0)", "-q:v", "1", $"{filePath.Name}-%4d.jpg"])
                    .WithWorkingDirectory(filePath.DirectoryFullPath)
                    .ExecuteAsync();
                commandTask.Task.Wait();
                check = true;
            }
            catch (Exception)
            {
                check = false;
            }
            if (check)
            {
                results.AddRange(Directory.GetFiles(filePath.DirectoryFullPath, $"{filePath.Name}-*.jpg", SearchOption.TopDirectoryOnly));
                if (results.Count == 0)
                    throw new Exception();
                File.SetCreationTime(results[0], new(filePath.CreationTicks));
                File.SetLastWriteTime(results[0], new(filePath.LastWriteTicks));
                Thread.Sleep(100);
            }
        }
        return results.AsReadOnly();
    }

#pragma warning disable CA1416

    private static DeterministicHashCode GetDeterministicHashCode(Stream stream)
    {
        DeterministicHashCode result;
        int? id;
        int? width;
        int? height;
        try
        {
            using Image image = Image.FromStream(stream);
            width = image.Width;
            height = image.Height;
            using Bitmap bitmap = new(image);
            Rectangle rectangle = new(0, 0, image.Width, image.Height);
            BitmapData bitmapData = bitmap.LockBits(rectangle, ImageLockMode.ReadOnly, bitmap.PixelFormat);
            IntPtr intPtr = bitmapData.Scan0;
            int length = bitmapData.Stride * bitmap.Height;
            byte[] bytes = new byte[length];
            Marshal.Copy(intPtr, bytes, 0, length);
            bitmap.UnlockBits(bitmapData);
            id = IId.GetDeterministicHashCode(bytes);
        }
        catch (Exception)
        {
            id = null;
            width = null;
            height = null;
        }
        result = new(height, id, width);
        return result;
    }

    private static Stream GetStream(HttpClient httpClient, Uri uri)
    {
        Stream result;
        Task<Stream> task = httpClient.GetStreamAsync(uri);
        task.Wait();
        result = task.Result;
        return result;
    }

    private static DeterministicHashCode GetDeterministicHashCode(HttpClient httpClient, Uri uri)
    {
        DeterministicHashCode result;
        Stream stream = GetStream(httpClient, uri);
        result = GetDeterministicHashCode(stream);
        stream.Dispose();
        return result;
    }

    DeterministicHashCode IWindows.GetDeterministicHashCode(HttpClient httpClient, Uri uri) =>
        GetDeterministicHashCode(httpClient, uri);

    DeterministicHashCode IWindows.GetDeterministicHashCode(HttpClient? httpClient, FilePath filePath)
    {
        DeterministicHashCode result;
        if (httpClient is not null)
            result = GetDeterministicHashCode(httpClient, new Uri(filePath.FullName));
        else
        {
            Stream stream = File.OpenRead(filePath.FullName);
            result = GetDeterministicHashCode(stream);
            stream.Dispose();
        }
        return result;
    }

#pragma warning restore CA1416

    private static ReadOnlyCollection<NginxFileSystem>? GetRecursiveCollection(HttpClient httpClient, string host, string page)
    {
        List<NginxFileSystem>? results;
        Uri uri = new($"http://{host}/{page}");
        string format = NginxFileSystem.GetFormat();
        TimeZoneInfo timeZoneInfo = TimeZoneInfo.Local;
        Task<HttpResponseMessage> taskHttpResponseMessage = httpClient.GetAsync(uri);
        taskHttpResponseMessage.Wait();
        if (!taskHttpResponseMessage.Result.IsSuccessStatusCode)
            results = null;
        else
        {
            Task<string> taskString = taskHttpResponseMessage.Result.Content.ReadAsStringAsync();
            taskString.Wait();
            NginxFileSystem[]? nginxFileSystems = JsonSerializer.Deserialize(taskString.Result, NginxFileSystemCollectionSourceGenerationContext.Default.NginxFileSystemArray);
            if (nginxFileSystems is null)
                results = null;
            else
            {
                results = [];
                NginxFileSystem nginxFileSystem;
                ReadOnlyCollection<NginxFileSystem>? directory;
                for (int i = 0; i < nginxFileSystems.Length; i++)
                {
                    nginxFileSystem = NginxFileSystem.Get(format, timeZoneInfo, uri, nginxFileSystems[i]);
                    if (nginxFileSystem.Type == "file")
                        results.Add(nginxFileSystem);
                    else
                    {
                        directory = GetRecursiveCollection(httpClient, host, $"{page}/{nginxFileSystem.Name}");
                        if (directory is null)
                            continue;
                        results.AddRange(directory);
                    }
                }
            }
        }
        return results?.AsReadOnly();
    }

    private static void VerifyParallelFor(AppSettings appSettings, IWindows windows, HttpClient httpClient, NginxFileSystem nginxFileSystem, List<string> messages)
    {
        windows.Tick();
        if (nginxFileSystem.URI is null)
            return;
        if (!nginxFileSystem.Name.EndsWith(".jpg"))
            return;
        DeterministicHashCode deterministicHashCode = windows.GetDeterministicHashCode(httpClient, nginxFileSystem.URI);
        if (deterministicHashCode.Id is null)
        {
            messages.Add($"{nginxFileSystem.URI.OriginalString}");
            return;
        }
        string paddedId = IId.GetPaddedId(resultSettings: appSettings.ResultSettings,
                                          metadataSettings: appSettings.MetadataSettings,
                                          id: deterministicHashCode.Id.Value,
                                          hasIgnoreKeyword: null,
                                          hasDateTimeOriginal: null,
                                          index: null);
        if (!nginxFileSystem.Name.StartsWith(paddedId))
            messages.Add($"!{nginxFileSystem.Name}.StartsWith({paddedId})");
    }

    private static void Verify(ILogger<Program>? logger, AppSettings appSettings, IWindows windows, string host, string page)
    {
        List<string> messages = [];
        HttpClient httpClient = new();
        int appSettingsMaxDegreeOfParallelism = appSettings.WindowsSettings.MaxDegreeOfParallelism;
        ParallelOptions parallelOptions = new() { MaxDegreeOfParallelism = appSettingsMaxDegreeOfParallelism };
        ReadOnlyCollection<NginxFileSystem> collection = GetRecursiveCollection(httpClient, host, page) ?? throw new Exception();
        windows.ConstructProgressBar(collection.Count, nameof(Verify));
        _ = Parallel.For(0, collection.Count, parallelOptions, (i, state) =>
            VerifyParallelFor(appSettings, windows, httpClient, collection[i], messages));
        httpClient.Dispose();
        foreach (string message in messages)
            logger?.LogWarning("{message}", message);
    }

    private static ReadOnlyCollection<NginxFileSystem> GetRecursiveCollection(string host, string page)
    {
        ReadOnlyCollection<NginxFileSystem> results;
        HttpClient httpClient = new();
        results = GetRecursiveCollection(httpClient, host, page) ?? throw new Exception();
        httpClient.Dispose();
        return results;
    }

    private List<FirstPass> GetCollection(ILogger<Program>? logger, AppSettings appSettings, IWindows windows, IEnumerable<string> files, A_Metadata metadata)
    {
        List<FirstPass> results = [];
        int index = -1;
        FilePath filePath;
        FirstPass firstPass;
        string directoryName;
        ExifDirectory exifDirectory;
        List<FileHolder> sidecarFiles;
        DeterministicHashCode deterministicHashCode;
        bool fastForwardMovingPictureExpertsGroupUsed;
        MinimumYearAndPathCombined minimumYearAndPathCombined;
        FilePath? fastForwardMovingPictureExpertsGroupFilePath;
        ReadOnlyDictionary<string, List<FileHolder>> keyValuePairs;
        ReadOnlyCollection<string>? fastForwardMovingPictureExpertsGroupFiles;
        HttpClient? httpClient = string.IsNullOrEmpty(appSettings.WindowsSettings.Host) || string.IsNullOrEmpty(appSettings.WindowsSettings.Page) ? null : new();
        if (string.IsNullOrEmpty(appSettings.WindowsSettings.Host) || string.IsNullOrEmpty(appSettings.WindowsSettings.Page))
            keyValuePairs = IMetadata.GetKeyValuePairs(files);
        else
        {
            ReadOnlyCollection<NginxFileSystem> collection = GetRecursiveCollection(appSettings.WindowsSettings.Host, appSettings.WindowsSettings.Page);
            keyValuePairs = IMetadata.GetKeyValuePairs(collection);
        }
        foreach (KeyValuePair<string, List<FileHolder>> keyValuePair in keyValuePairs)
        {
            index += 1;
            windows.Tick();
            if (keyValuePair.Value.Count > 2)
                throw new NotSupportedException("Too many sidecar files!");
            foreach (FileHolder fileHolder in keyValuePair.Value)
            {
                if (appSettings.WindowsSettings.SidecarExtensions.Contains(fileHolder.ExtensionLowered))
                    continue;
                if (appSettings.WindowsSettings.IgnoreExtensions.Contains(fileHolder.ExtensionLowered))
                    continue;
                filePath = FilePath.Get(appSettings.ResultSettings, appSettings.MetadataSettings, fileHolder, index);
                if (filePath.Id is not null && (filePath.IsIntelligentIdFormat || filePath.SortOrder is not null))
                    continue;
                if (filePath.Id is not null)
                {
                    fastForwardMovingPictureExpertsGroupFiles = null;
                    deterministicHashCode = new(null, filePath.Id, null);
                    directoryName = Path.GetFileName(filePath.DirectoryFullPath);
                    if (directoryName.EndsWith(filePath.Id.Value.ToString()))
                        continue;
                }
                else
                {
                    fastForwardMovingPictureExpertsGroupFiles = windows.ConvertAndGetFastForwardMovingPictureExpertsGroupFiles(appSettings.WindowsSettings, httpClient, filePath);
                    fastForwardMovingPictureExpertsGroupFilePath = fastForwardMovingPictureExpertsGroupFiles.Count == 0 ? null : FilePath.Get(appSettings.ResultSettings, appSettings.MetadataSettings, FileHolder.Get(fastForwardMovingPictureExpertsGroupFiles[0]), index);
                    deterministicHashCode = fastForwardMovingPictureExpertsGroupFilePath is null ? windows.GetDeterministicHashCode(httpClient, filePath) : windows.GetDeterministicHashCode(httpClient, fastForwardMovingPictureExpertsGroupFilePath);
                }
                sidecarFiles = [];
                filePath = FilePath.Get(filePath, deterministicHashCode);
                for (int i = 0; i < keyValuePair.Value.Count; i++)
                {
                    if (keyValuePair.Value[i].ExtensionLowered == fileHolder.ExtensionLowered)
                        continue;
                    sidecarFiles.Add(keyValuePair.Value[i]);
                }
                try
                { (minimumYearAndPathCombined, exifDirectory) = metadata.GetMetadataCollection(appSettings.ResultSettings, appSettings.MetadataSettings, httpClient, filePath); }
                catch (Exception)
                {
                    logger?.LogWarning("<{filePath}>", filePath.FullName);
                    continue;
                }
                fastForwardMovingPictureExpertsGroupUsed = fastForwardMovingPictureExpertsGroupFiles is not null && fastForwardMovingPictureExpertsGroupFiles.Count > 0;
                if (fastForwardMovingPictureExpertsGroupUsed && fastForwardMovingPictureExpertsGroupFiles is not null)
                {
                    foreach (string fastForwardMovingPictureExpertsGroupFile in fastForwardMovingPictureExpertsGroupFiles)
                        File.Delete(fastForwardMovingPictureExpertsGroupFile);
                }
                if (!fastForwardMovingPictureExpertsGroupUsed && appSettings.WindowsSettings.ValidVideoFormatExtensions.Contains(filePath.ExtensionLowered))
                    fastForwardMovingPictureExpertsGroupUsed = true;
                firstPass = new(exifDirectory, fastForwardMovingPictureExpertsGroupUsed, minimumYearAndPathCombined, sidecarFiles.ToArray());
                results.Add(firstPass);
            }
        }
        return results;
    }

    private void WindowsWork(ILogger<Program>? logger, AppSettings appSettings, IWindows windows, long ticks)
    {
        if (appSettings.WindowsSettings.VerifyOnly && !string.IsNullOrEmpty(appSettings.WindowsSettings.Host) && !string.IsNullOrEmpty(appSettings.WindowsSettings.Page))
            Verify(logger, appSettings, windows, appSettings.WindowsSettings.Host, appSettings.WindowsSettings.Page);
        else
        {
            FirstPass firstPass;
            List<FirstPass> results = [];
            string sourceDirectory = Path.GetFullPath(appSettings.ResultSettings.RootDirectory);
            if (!Directory.Exists(sourceDirectory))
                _ = Directory.CreateDirectory(sourceDirectory);
            logger?.LogInformation("{Ticks} {RootDirectory}", ticks, sourceDirectory);
            ReadOnlyCollection<string> files = Directory.GetFiles(sourceDirectory, "*", SearchOption.AllDirectories).ToArray().AsReadOnly();
            if (files.Count > 0)
                _ = IPath.DeleteEmptyDirectories(appSettings.ResultSettings.RootDirectory);
            A_Metadata metadata = new(appSettings.ResultSettings, appSettings.MetadataSettings);
            int appSettingsMaxDegreeOfParallelism = appSettings.WindowsSettings.MaxDegreeOfParallelism;
            int filesCount = appSettingsMaxDegreeOfParallelism == 1 ? files.Count : 123000;
            windows.ConstructProgressBar(filesCount, "EnumerateFiles load");
            if (appSettingsMaxDegreeOfParallelism == 1)
                results.AddRange(GetCollection(logger, appSettings, windows, files, metadata));
            else
            {
                List<string> distinct = [];
                List<MetadataGroup> metadataGroups = [];
                ParallelOptions parallelOptions = new() { MaxDegreeOfParallelism = appSettingsMaxDegreeOfParallelism };
                files.AsParallel().ForAll(IMetadata.SetExifDirectoryCollection(windows, appSettings.ResultSettings, appSettings.MetadataSettings, appSettings.WindowsSettings, metadata, distinct, metadataGroups));
                if (_ProgressBar?.CurrentTick != results.Count)
                    throw new NotSupportedException();
                foreach (MetadataGroup metadataGroup in metadataGroups)
                {
                    if (metadataGroup.FastForwardMovingPictureExpertsGroupUsed || !appSettings.WindowsSettings.ValidVideoFormatExtensions.Contains(metadataGroup.FilePath.ExtensionLowered))
                        firstPass = new(metadataGroup.ExifDirectory, metadataGroup.FastForwardMovingPictureExpertsGroupUsed, metadataGroup.MinimumYearAndPathCombined, metadataGroup.SidecarFiles.ToArray());
                    else
                        firstPass = new(metadataGroup.ExifDirectory, FastForwardMovingPictureExpertsGroupUsed: true, metadataGroup.MinimumYearAndPathCombined, metadataGroup.SidecarFiles.ToArray());
                    results.Add(firstPass);
                }
            }
            string json = JsonSerializer.Serialize(results, FirstPassCollectionSourceGenerationContext.Default.ListFirstPass);
            File.WriteAllText(Path.Combine(sourceDirectory, $"{ticks}.json"), json);
        }
    }

}