using LANCommander.SDK.Enums;
using LANCommander.SDK.Helpers;
using LANCommander.SDK.Models;
using Microsoft.Extensions.Logging;
using SharpCompress.Common;
using SharpCompress.Readers;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using LANCommander.SDK.Abstractions;
using LANCommander.SDK.Exceptions;
using LANCommander.SDK.Factories;

namespace LANCommander.SDK.Services
{
    public class RedistributableClient(
        ILogger<RedistributableClient> logger,
        ISettingsProvider settingsProvider,
        ApiRequestFactory apiRequestFactory,
        ScriptClient scriptClient,
        ProfileClient profileClient)
    {
        public delegate void OnArchiveEntryExtractionProgressHandler(object sender, ArchiveEntryExtractionProgressArgs e);
        public event OnArchiveEntryExtractionProgressHandler OnArchiveEntryExtractionProgress;

        public delegate void OnArchiveExtractionProgressHandler(long position, long length);
        public event OnArchiveExtractionProgressHandler OnArchiveExtractionProgress;
        
        public delegate void OnInstallProgressUpdateHandler(InstallProgress e);
        public event OnInstallProgressUpdateHandler OnInstallProgressUpdate;
        
        private InstallProgress _installProgress;

        public async Task<SDK.Models.Manifest.Redistributable> GetManifestAsync(Guid id)
        {
            return await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/api/Redistributables/{id}")
                .GetAsync<SDK.Models.Manifest.Redistributable>();
        }

        public async Task<IEnumerable<Script>> GetScriptsAsync(Guid id)
        {
            return await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/api/Redistributables/{id}/Scripts")
                .GetAsync<IEnumerable<Script>>();
        }

        public async Task WriteScriptsAsync(Game game, Redistributable redistributable)
        {
            var scripts = await GetScriptsAsync(redistributable.Id);

            if (scripts != null && scripts.Any())
            {
                logger?.LogTrace($"Saving scripts for redistributable {redistributable.Name} ({redistributable.Id}) into {game.InstallDirectory}");
                
                foreach (var script in scripts)
                    await ScriptHelper.SaveScriptAsync(game, redistributable, script);
            }
        }
        
        public async Task<bool> CheckForUpdateAsync(Guid id, string currentVersion)
        {
            return await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/api/Redistributables/{id}/CheckForUpdate?version={currentVersion}")
                .GetAsync<bool>();
        }

        public async Task<IEnumerable<Archive>> GetUpdatesAsync(Guid redistributableId, string version)
        {
            return await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/api/Redistributables/{redistributableId}/Updates?version={version}")
                .GetAsync<IEnumerable<Archive>>();
        }

        public async Task<Stream> Stream(Guid id)
        {
            return await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/api/Redistributables/{id}/Download")
                .StreamAsync();
        }

        private async Task<TrackableStream> StreamArchiveAsync(Guid archiveId)
        {
            return await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/Download/Archive/{archiveId}")
                .StreamAsync();
        }

        public async Task InstallAsync(Game game)
        {
            foreach (var redistributable in game.Redistributables)
            {
                await InstallAsync(redistributable, game);
            }
        }

        public async Task InstallAsync(Redistributable redistributable, Game game, int maxAttempts = 10)
        {
            _installProgress = new InstallProgress();
            
            _installProgress.Status = InstallStatus.Downloading;
            _installProgress.Title = redistributable.Name;
            _installProgress.Progress = 0;
            _installProgress.TransferSpeed = 0;
            _installProgress.TotalBytes = 0;
            _installProgress.BytesTransferred = 0;
            
            OnInstallProgressUpdate?.Invoke(_installProgress);

            try
            {
                logger?.LogTrace("Saving manifest");
                
                var manifest = await GetManifestAsync(redistributable.Id);

                await ManifestHelper.WriteAsync(manifest, game.InstallDirectory);
                
                logger?.LogTrace("Saving scripts");

                await WriteScriptsAsync(game, redistributable);

                var hasDetectInstallScript = redistributable.Scripts != null &&
                    redistributable.Scripts.Any(s => s.Type == Enums.ScriptType.DetectInstall);

                var installed = hasDetectInstallScript &&
                    await scriptClient.Redistributable_RunDetectInstallScriptAsync(game.InstallDirectory, game.Id, redistributable.Id);

                logger?.LogTrace("Redistributable install detection returned {Result} (hasDetectScript={HasDetectScript})", installed, hasDetectInstallScript);

                if (!installed)
                {
                    logger?.LogTrace("Redistributable {RedistributableName} not installed", redistributable.Name);

                    using (var fileTracker = new InstallDirectoryFileTracker(game.InstallDirectory))
                    {
                        if (redistributable.Archives?.Any() ?? false)
                        {
                            logger?.LogTrace("Archives for redistributable {RedistributableName} exist. Attempting to download...", redistributable.Name);

                            var result = await RetryHelper.RetryOnExceptionAsync(maxAttempts,
                                TimeSpan.FromMilliseconds(500), new ExtractionResult(),
                                async () =>
                                {
                                    logger?.LogTrace("Attempting to download and extract redistributable");

                                    return await DownloadAndExtractAsync(redistributable, game, CancellationToken.None);
                                });

                            if (!result.Success && !result.Canceled)
                                throw new InstallException("Could not extract the redistributable. Retry the install or check your connection");
                            
                            if (result.Canceled)
                                throw new InstallCanceledException("Redistributable install canceled");

                            logger?.LogTrace("Extraction of redistributable successful. Extracted path is {Path}", result.Directory);
                            logger?.LogTrace("Running install script for redistributable {RedistributableName}", redistributable.Name);

                            await RunPostInstallScripts(game, redistributable);
                        }
                        else
                        {
                            logger?.LogTrace("No archives exist for redistributable {RedistributableName}. Running install script anyway...", redistributable.Name);

                            await RunPostInstallScripts(game, redistributable);
                        }

                        SaveTrackedFiles(game.InstallDirectory, redistributable.Id, fileTracker);
                    }
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex, "Redistributable {Redistributable} failed to install", redistributable.Name);
            }
        }
        
        public async Task<bool> ApplyUpdateArchiveAsync(Guid archiveId, Guid redistributableId, Game game, CancellationToken cancellationToken = default)
        {
            _installProgress = new InstallProgress();
            _installProgress.Status = InstallStatus.Downloading;
            _installProgress.Title = game.Title;
            _installProgress.Progress = 0;

            OnInstallProgressUpdate?.Invoke(_installProgress);

            var destination = Path.Combine(GameClient.GetMetadataDirectoryPath(game.InstallDirectory, redistributableId), "Files");

            logger?.LogTrace("Downloading archive {ArchiveId} and extracting redistributable {RedistributableId} to path {Destination}", archiveId, redistributableId, destination);

            try
            {
                Directory.CreateDirectory(destination);

                using (var stream = await StreamArchiveAsync(archiveId))
                {
                    var monitor = new FileTransferMonitor(stream.Length);
                    var progress = new Progress<ProgressReport>(report =>
                    {
                        if (cancellationToken.IsCancellationRequested)
                            return;

                        if (monitor.CanUpdate())
                        {
                            monitor.Update(stream.Position);

                            _installProgress.BytesTransferred = monitor.GetBytesTransferred();
                            _installProgress.TotalBytes = stream.Length;
                            _installProgress.TransferSpeed = monitor.GetSpeed();
                            _installProgress.TimeRemaining = monitor.GetTimeRemaining();

                            OnInstallProgressUpdate?.Invoke(_installProgress);
                        }

                        OnArchiveEntryExtractionProgress?.Invoke(this, new ArchiveEntryExtractionProgressArgs
                        {
                            Progress = report,
                        });
                    });

                    await using var reader = await ReaderFactory.OpenAsyncReader(stream, new ReaderOptions { Progress = progress }, cancellationToken);
                    await reader.WriteAllToDirectoryAsync(destination, new ExtractionOptions()
                    {
                        ExtractFullPath = true,
                        Overwrite = true
                    }, cancellationToken);
                }

                logger?.LogTrace("Successfully applied update archive {ArchiveId} for redistributable {RedistributableId}", archiveId, redistributableId);
                return true;
            }
            catch (Exception ex)
            {
                logger?.LogError(ex, "Could not apply update archive {ArchiveId} for redistributable {RedistributableId}", archiveId, redistributableId);

                if (Directory.Exists(destination))
                {
                    logger?.LogTrace("Cleaning up orphaned files after bad update");
                    Directory.Delete(destination, true);
                }

                throw new InstallException("The redistributable update archive could not be extracted. Please try again");
            }
        }

        public async Task RefreshManifestAndScriptsAsync(string installDirectory, Redistributable redistributable)
        {
            logger?.LogTrace("Refreshing manifest and scripts for redistributable {RedistributableId} in {InstallDirectory}", redistributable.Id, installDirectory);

            var manifest = await GetManifestAsync(redistributable.Id);
            await ManifestHelper.WriteAsync(manifest, installDirectory);

            var scripts = await GetScriptsAsync(redistributable.Id);

            if (scripts != null && scripts.Any())
            {
                var game = new Game { InstallDirectory = installDirectory };

                foreach (var script in scripts)
                    await ScriptHelper.SaveScriptAsync(game, redistributable, script);
            }
        }

        private async Task RunPostInstallScripts(Game game, Redistributable redistributable)
        {
            if (redistributable.Scripts != null && redistributable.Scripts.Any())
            {
                //GameInstallProgress.Status = GameInstallStatus.RunningScripts;

                // OnGameInstallProgressUpdate?.Invoke(GameInstallProgress);

                try
                {
                    await scriptClient.Redistributable_RunInstallScriptAsync(game.InstallDirectory, game.Id, redistributable.Id);
                    await scriptClient.Redistributable_RunNameChangeScriptAsync(game.InstallDirectory, game.Id, redistributable.Id, await profileClient.GetAliasAsync());
                }
                catch (Exception ex)
                {
                    logger?.LogError(ex, "Scripts failed to execute for redistributable {RedistributableName} ({GameId})", redistributable.Name, redistributable.Id);
                }
            }
        }

        private async Task<ExtractionResult> DownloadAndExtractAsync(Redistributable redistributable, Game game, CancellationToken cancellationToken = default)
        {
            if (redistributable == null)
            {
                logger?.LogTrace("Redistributable failed to download! No redistributable was specified");
                throw new ArgumentNullException(nameof(redistributable));
            }

            var destination = Path.Combine(GameClient.GetMetadataDirectoryPath(game.InstallDirectory, redistributable.Id), "Files");
            var files = new List<ExtractionResult.FileEntry>();

            logger?.LogTrace("Downloading and extracting {Redistributable} to path {Destination}", redistributable.Name, destination);

            try
            {
                Directory.CreateDirectory(destination);

                using (var redistributableStream = await Stream(redistributable.Id))
                {
                    var monitor = new FileTransferMonitor(redistributableStream.Length);
                    var seenEntries = new System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase);
                    var progress = new Progress<ProgressReport>(report =>
                    {
                        if (!string.IsNullOrEmpty(report.EntryPath) && seenEntries.Add(report.EntryPath))
                        {
                            files.Add(new ExtractionResult.FileEntry
                            {
                                EntryPath = report.EntryPath,
                                LocalPath = Path.Combine(destination, report.EntryPath),
                            });
                        }

                        if (monitor.CanUpdate())
                        {
                            monitor.Update(redistributableStream.Position);

                            _installProgress.BytesTransferred = monitor.GetBytesTransferred();
                            _installProgress.TotalBytes = redistributableStream.Length;
                            _installProgress.TransferSpeed = monitor.GetSpeed();
                            _installProgress.TimeRemaining = monitor.GetTimeRemaining();

                            OnInstallProgressUpdate?.Invoke(_installProgress);
                        }

                        OnArchiveEntryExtractionProgress?.Invoke(this, new ArchiveEntryExtractionProgressArgs
                        {
                            Progress = report,
                        });
                    });

                    await using var reader = await ReaderFactory.OpenAsyncReader(redistributableStream, new ReaderOptions { Progress = progress }, cancellationToken);
                    await reader.WriteAllToDirectoryAsync(destination, new ExtractionOptions()
                    {
                        ExtractFullPath = true,
                        Overwrite = true
                    }, cancellationToken);
                }
            }
            catch (Exception ex)
            {
                logger?.LogError(ex, "Could not extract to path {Destination}", destination);

                if (Directory.Exists(destination))
                {
                    logger?.LogTrace("Cleaning up orphaned files after bad install");

                    Directory.Delete(destination, true);
                }

                throw new Exception("The redistributable archive could not be extracted, is it corrupted? Please try again");
            }

            var extractionResult = new ExtractionResult
            {
                Canceled = false
            };

            if (!extractionResult.Canceled)
            {
                extractionResult.Success = true;
                extractionResult.Directory = destination;
                extractionResult.Files = files;
                logger?.LogTrace("Redistributable {Redistributable} successfully downloaded and extracted to {Destination}", redistributable.Name, destination);
            }

            return extractionResult;
        }

        public async Task ImportAsync(string archivePath)
        {
            using (var fs = new FileStream(archivePath, FileMode.Open, FileAccess.Read))
            {
                var objectKey = await apiRequestFactory
                    .Create()
                    .UseAuthenticationToken()
                    .UseVersioning()
                    .UploadInChunksAsync(settingsProvider.CurrentValue.Archives.UploadChunkSize, fs);

                if (objectKey != Guid.Empty)
                    await apiRequestFactory
                        .Create()
                        .UseAuthenticationToken()
                        .UseVersioning()
                        .UseRoute($"/api/Redistributables/Import/{objectKey}")
                        .PostAsync();
            }
        }

        [Obsolete("Exporter no longer provides \"full\" exports")]
        public async Task ExportAsync(string destinationPath, Guid redistributableId)
        {
            await apiRequestFactory
                .Create()
                .UseAuthenticationToken()
                .UseVersioning()
                .UseRoute($"/Redistributables/{redistributableId}/Export/Full")
                .DownloadAsync(destinationPath);
        }

        public async Task UploadArchiveAsync(string archivePath, Guid redistributableId, string version, string changelog = "")
        {
            using (var fs = new FileStream(archivePath, FileMode.Open, FileAccess.Read))
            {
                var objectKey = await apiRequestFactory
                    .Create()
                    .UseAuthenticationToken()
                    .UseVersioning()
                    .UploadInChunksAsync(settingsProvider.CurrentValue.Archives.UploadChunkSize, fs);

                if (objectKey != Guid.Empty)
                    await apiRequestFactory
                        .Create()
                        .UseAuthenticationToken()
                        .UseVersioning()
                        .UseRoute("/api/Redistributables/UploadArchive")
                        .AddBody(new UploadArchiveRequest
                        {
                            Id = redistributableId,
                            ObjectKey = objectKey,
                            Version = version,
                            Changelog = changelog,
                        })
                        .PostAsync();
            }
        }
        private void SaveTrackedFiles(string installDirectory, Guid redistributableId, InstallDirectoryFileTracker fileTracker)
        {
            try
            {
                var relativePaths = fileTracker.GetCreatedFiles()
                    .Select(f => Path.GetRelativePath(installDirectory, f))
                    .OrderBy(f => f)
                    .ToList();

                var fileListPath = GameClient.GetMetadataFilePath(installDirectory, redistributableId, "FileList.txt");

                var directory = Path.GetDirectoryName(fileListPath);
                if (!Directory.Exists(directory))
                    Directory.CreateDirectory(directory);

                File.WriteAllText(fileListPath, string.Join(Environment.NewLine, relativePaths));

                logger?.LogTrace("Tracked {Count} files installed by redistributable {RedistributableId}", relativePaths.Count, redistributableId);
            }
            catch (Exception ex)
            {
                logger?.LogWarning(ex, "Could not track files for redistributable {RedistributableId}", redistributableId);
            }
        }

        private class InstallDirectoryFileTracker : IDisposable
        {
            private readonly FileSystemWatcher _watcher;
            private readonly HashSet<string> _createdFiles = new(StringComparer.OrdinalIgnoreCase);
            private readonly string _metadataPath;
            private readonly object _lock = new();

            public InstallDirectoryFileTracker(string installDirectory)
            {
                _metadataPath = Path.Combine(installDirectory, ".lancommander");

                _watcher = new FileSystemWatcher(installDirectory)
                {
                    IncludeSubdirectories = true,
                    NotifyFilter = NotifyFilters.FileName,
                    EnableRaisingEvents = true,
                };

                _watcher.Created += OnFileCreated;
                _watcher.Renamed += OnFileRenamed;
            }

            private void OnFileCreated(object sender, FileSystemEventArgs e)
            {
                if (e.FullPath.StartsWith(_metadataPath, StringComparison.OrdinalIgnoreCase))
                    return;

                lock (_lock)
                    _createdFiles.Add(e.FullPath);
            }

            private void OnFileRenamed(object sender, RenamedEventArgs e)
            {
                if (e.FullPath.StartsWith(_metadataPath, StringComparison.OrdinalIgnoreCase))
                    return;

                lock (_lock)
                    _createdFiles.Add(e.FullPath);
            }

            public IEnumerable<string> GetCreatedFiles()
            {
                lock (_lock)
                    return _createdFiles.ToList();
            }

            public void Dispose()
            {
                _watcher.EnableRaisingEvents = false;
                _watcher.Created -= OnFileCreated;
                _watcher.Renamed -= OnFileRenamed;
                _watcher.Dispose();
            }
        }
    }
}