using ImageCatalog_2.Commands;
using ImageCatalog_2.Models;
using ImageCatalog_2.Services;
using ImageCatalog_2.ViewModels;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
#if WINDOWS
using System.Drawing.Text;
#endif
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Input;
using AIFotoONLUS.Core;
using AutoMapper;
using MaddoShared;
using Microsoft.Extensions.Logging;

namespace ImageCatalog_2
{
    public class DataModel : ViewModelBase
    {
        public ICommand TestCommand { get; }
        public ICommand AsyncTestCommand { get; }
        public ICommand AsyncCancelOperationCommand { get; }
        public ICommand ProcessImagesCommand { get; }
        public ICommand SelectSourceFolderCommand { get; }
        public ICommand SelectDestinationFolderCommand { get; }
        public ICommand SelectLogoFileCommand { get; }
        public ICommand SaveSettingsCommand { get; }
        public ICommand LoadSettingsCommand { get; }
        public ICommand SelectColorCommand { get; }
        public ICommand SelectTransparentColorCommand { get; }
        public ICommand SelectModelsFolderCommand { get; }
        public ICommand SelectCsvOutputCommand { get; }
        public ICommand StartAiCommand { get; }
        public ICommand StartFaceEncoderCommand { get; }
        public ICommand StopFaceEncoderCommand { get; }

        private readonly ITestService _service;
        private readonly ILogger<DataModel> _logger;
        private readonly ISettingsService _settingsService;
        private readonly ImageCreationService _imageCreationService;
        private readonly IAiExtractionService _aiExtractionService;
        private readonly IImageProcessingCoordinator _imageProcessingCoordinator;
        private readonly ProcessingStateViewModel _processing;
        private readonly PathSettingsViewModel _paths;
        private readonly AiSettingsViewModel _ai;
        private readonly RaceUploadSettingsViewModel _raceUpload;
        private readonly VisualSettingsViewModel _visual;
        private readonly PicSettings _picSettings;
        private readonly IMapper _mapper;
        private readonly AsyncCommand _startFaceEncoderCommand;
        private readonly AsyncCommand _stopFaceEncoderCommand;
        private readonly object _faceEncoderProcessLock = new();
        private Process? _faceEncoderProcess;
        private CancellationTokenSource? _faceEncoderWatcherTokenSource;
        private Task? _faceEncoderWatcherTask;
        private CancellationTokenSource? _faceEncoderLogWatcherTokenSource;
        private Task? _faceEncoderLogWatcherTask;
        private bool _hasStartedFaceEncoderInSession;

        // ComboBox collections
        public List<string> AvailableFonts { get; }
        public List<string> VerticalPositions { get; } = new() { "Alto", "Centro", "Basso" };
        public List<string> HorizontalAlignments { get; } = new() { "Sinistra", "Centro", "Destra" };

        [CLSCompliant(false)]
        public DataModel(ITestService testService, ISettingsService settingsService,
            ImageCreationService imageCreationService, IAiExtractionService aiExtractionService, IImageProcessingCoordinator imageProcessingCoordinator, PicSettings picSettings,
            IMapper mapper, ILogger<DataModel> logger, MaddoShared.IVersionProvider? versionProvider = null)
        {
            _service = testService;
            _logger = logger;
            _settingsService = settingsService;
            _imageCreationService = imageCreationService;
            _aiExtractionService = aiExtractionService;
            _imageProcessingCoordinator = imageProcessingCoordinator;
            _processing = new ProcessingStateViewModel();
            _processing.PropertyChanged += OnProcessingPropertyChanged;
            _paths = new PathSettingsViewModel();
            _paths.PropertyChanged += OnPathsPropertyChanged;
            _ai = new AiSettingsViewModel();
            _ai.PropertyChanged += OnAiPropertyChanged;
            _raceUpload = new RaceUploadSettingsViewModel();
            _raceUpload.PropertyChanged += OnRaceUploadPropertyChanged;
            _visual = new VisualSettingsViewModel();
            _visual.PropertyChanged += OnVisualPropertyChanged;
            _picSettings = picSettings;
            _mapper = mapper;
            // Populate AppVersion from version provider when available
            AppVersion = versionProvider?.GetVersionString() ?? string.Empty;

            TestCommand = new RelayCommand(Test);
            AsyncTestCommand = new AsyncCommand(TestAsync);
            AsyncCancelOperationCommand = new AsyncCommand(CancelOperation);
            ProcessImagesCommand = new AsyncCommand(ProcessImages);
            SelectModelsFolderCommand = new RelayCommand(SelectModelsFolder);
            SelectCsvOutputCommand = new RelayCommand(SelectCsvOutput);
            StartAiCommand = new AsyncCommand(StartAiAsync);
            _startFaceEncoderCommand = new AsyncCommand(RunFaceEncoderAsync, CanRunFaceEncoder);
            _stopFaceEncoderCommand = new AsyncCommand(() => StopFaceEncoderAsync("Arresto richiesto dall'utente."), CanStopFaceEncoder);
            StartFaceEncoderCommand = _startFaceEncoderCommand;
            StopFaceEncoderCommand = _stopFaceEncoderCommand;

            SelectSourceFolderCommand = new RelayCommand(SelectSourceFolder);
            SelectDestinationFolderCommand = new RelayCommand(SelectDestinationFolder);
            SelectLogoFileCommand = new RelayCommand(SelectLogoFile);
            SaveSettingsCommand = new RelayCommand(SaveSettings);
            LoadSettingsCommand = new RelayCommand(LoadSettings);
            SelectColorCommand = new RelayCommand(SelectColor);
            SelectTransparentColorCommand = new RelayCommand(SelectTransparentColor);

            // Load available fonts
            AvailableFonts = LoadAvailableFonts();
            RefreshNumberAiGpuCapabilities();
            RefreshFaceExecutableCapabilities();
        }

        private async Task StartAiAsync()
        {
            MainToken = new CancellationTokenSource();
            try
            {
                await RunAiExtractionCoreAsync(MainToken.Token, useDestination: true, recursive: true).ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
                await InvokeOnUiThreadAsync(() => NumberAiStatsSummary = "OCR annullato.").ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "AI extraction failed");
                if (UseNumberAiGpu)
                {
                    RefreshNumberAiGpuCapabilities();
                }

                await InvokeOnUiThreadAsync(() => NumberAiStatsSummary = $"Errore OCR: {ex.GetBaseException().Message}").ConfigureAwait(false);

                await ShowErrorMessageAsync("Errore AI", ex.GetBaseException().Message).ConfigureAwait(false);
            }
            finally
            {
                MainToken = null;
            }
        }

        private async Task RunAiExtractionCoreAsync(CancellationToken token, bool useDestination = false, bool recursive = false, bool failOnInvalidPath = false)
        {
            var searchRoot = useDestination ? DestinationPath : SourcePath;
            if (string.IsNullOrWhiteSpace(searchRoot) || !System.IO.Directory.Exists(searchRoot))
            {
                _logger.LogWarning("AI extraction path invalid: {Path}", searchRoot);
                if (failOnInvalidPath)
                {
                    throw new DirectoryNotFoundException($"AI extraction path invalid: {searchRoot}");
                }

                return;
            }

            await InvokeOnUiThreadAsync(() =>
            {
                PreviewResults.Clear();
                AiProgress = 0;
                NumberAiStatsSummary = BuildNumberAiIdleSummary();
            }).ConfigureAwait(false);

            var summary = await _aiExtractionService.RunAsync(
                new AiExtractionRequest
                {
                    SearchRoot = searchRoot,
                    Recursive = recursive,
                    IncludeThumbnails = IncludeNumberAiThumbnails,
                    ModelsFolderPath = ModelsFolderPath,
                    UseGpu = UseNumberAiGpu,
                    WorkloadLevel = NumberAiWorkloadLevel,
                    CsvOutputPath = CsvOutputPath
                },
                token,
                result => InvokeOnUiThreadAsync(() =>
                {
                    if (!string.IsNullOrWhiteSpace(result.Text))
                    {
                        PreviewResults.Add(result);
                    }
                }),
                progress => InvokeOnUiThreadAsync(() =>
                {
                    AiProgress = progress.PercentComplete;
                    NumberAiStatsSummary = BuildNumberAiProgressSummary(progress);
                })).ConfigureAwait(false);

            await InvokeOnUiThreadAsync(() =>
            {
                AiProgress = summary.TotalFiles > 0 ? 100 : 0;
                NumberAiStatsSummary = BuildNumberAiCompletionSummary(summary);
            }).ConfigureAwait(false);
        }

        /// <summary>
        /// Optional UI-thread invoker set by the active UI layer.
        /// </summary>
        public Action<Action>? UiInvoker { get; set; }

        private Task InvokeOnUiThreadAsync(Action action)
        {
            return Task.Run(() =>
            {
                if (UiInvoker != null)
                    UiInvoker(action);
                else
                    action();
            });
        }

        public AiSettingsViewModel Ai => _ai;
        public RaceUploadSettingsViewModel RaceUpload => _raceUpload;

        // AI properties
        public bool ExtractNumbers
        {
            get => _ai.ExtractNumbers;
            set => _ai.ExtractNumbers = value;
        }

        public string ModelsFolderPath
        {
            get => _ai.ModelsFolderPath;
            set
            {
                _ai.ModelsFolderPath = value;
                RefreshNumberAiGpuCapabilities();
            }
        }

        public string CsvOutputPath
        {
            get => _ai.CsvOutputPath;
            set => _ai.CsvOutputPath = value;
        }

        public bool UseNumberAiGpu
        {
            get => _ai.UseNumberAiGpu;
            set => SetUseNumberAiGpu(value);
        }

        public bool NumberAiGpuOptionEnabled
        {
            get => _ai.NumberAiGpuOptionEnabled;
            private set => _ai.NumberAiGpuOptionEnabled = value;
        }

        public bool IncludeNumberAiThumbnails
        {
            get => _ai.IncludeNumberAiThumbnails;
            set => _ai.IncludeNumberAiThumbnails = value;
        }

        public IReadOnlyList<int> NumberAiWorkloadOptions { get; } = [1, 2, 3, 4, 5];

        public int NumberAiWorkloadLevel
        {
            get => _ai.NumberAiWorkloadLevel;
            set => _ai.NumberAiWorkloadLevel = NormalizeNumberAiWorkloadLevel(value);
        }

        public string NumberAiStatsSummary
        {
            get => _ai.NumberAiStatsSummary;
            private set => _ai.NumberAiStatsSummary = value;
        }

        public string FaceExecutablePath
        {
            get => _ai.FaceExecutablePath;
            set
            {
                var normalizedValue = value ?? string.Empty;
                if (string.Equals(_ai.FaceExecutablePath, normalizedValue, StringComparison.Ordinal))
                {
                    RefreshFaceExecutableCapabilities();
                    return;
                }

                _ai.FaceExecutablePath = normalizedValue;
                RefreshFaceExecutableCapabilities();
            }
        }

        public string FaceOutputFolderPath
        {
            get => _ai.FaceOutputFolderPath;
            set => _ai.FaceOutputFolderPath = value;
        }

        public bool FaceRecursive
        {
            get => _ai.FaceRecursive;
            set => _ai.FaceRecursive = value;
        }

        public bool FaceIncludeThumbnails
        {
            get => _ai.FaceIncludeThumbnails;
            set => _ai.FaceIncludeThumbnails = value;
        }

        public IReadOnlyList<int> FaceParallelismOptions { get; } = [1, 2, 3, 4, 5];

        public int FaceParallelism
        {
            get => _ai.FaceParallelism;
            set => _ai.FaceParallelism = value;
        }

        public int FaceMinSize
        {
            get => _ai.FaceMinSize;
            set => _ai.FaceMinSize = value;
        }

        public bool FaceUpsample
        {
            get => _ai.FaceUpsample;
            set => _ai.FaceUpsample = value;
        }

        public bool FaceGpuOptionEnabled => _ai.FaceGpuOptionEnabled;

        public bool UseFaceGpu
        {
            get => _ai.UseFaceGpu;
            set => SetUseFaceGpu(value);
        }

        public bool IsFaceEncoderRunning
        {
            get => _ai.IsFaceEncoderRunning;
            private set => _ai.IsFaceEncoderRunning = value;
        }

        public string FaceStatusMessage
        {
            get => _ai.FaceStatusMessage;
            private set => _ai.FaceStatusMessage = value;
        }

        public string FaceCommandOutput
        {
            get => _ai.FaceCommandOutput;
            private set => _ai.FaceCommandOutput = value;
        }

        // Race upload settings
        public string ApiLogin
        {
            get => _raceUpload.ApiLogin;
            set => _raceUpload.ApiLogin = value;
        }

        public string ApiPassword
        {
            get => _raceUpload.ApiPassword;
            set => _raceUpload.ApiPassword = value;
        }

        public string ApiRaceDescription
        {
            get => _raceUpload.ApiRaceDescription;
            set => _raceUpload.ApiRaceDescription = value;
        }

        public string ApiRaceTypeId
        {
            get => _raceUpload.ApiRaceTypeId;
            set => _raceUpload.ApiRaceTypeId = value;
        }

        public DateTime ApiRaceStartDate
        {
            get => _raceUpload.ApiRaceStartDate;
            set => _raceUpload.ApiRaceStartDate = value;
        }

        public DateTime ApiRaceEndDate
        {
            get => _raceUpload.ApiRaceEndDate;
            set => _raceUpload.ApiRaceEndDate = value;
        }

        public string ApiPathBase
        {
            get => _raceUpload.ApiPathBase;
            set => _raceUpload.ApiPathBase = value;
        }

        public string ApiLocalita
        {
            get => _raceUpload.ApiLocalita;
            set => _raceUpload.ApiLocalita = value;
        }

        public int ApiEventoInLineaIndex
        {
            get => _raceUpload.ApiEventoInLineaIndex;
            set => _raceUpload.ApiEventoInLineaIndex = value;
        }

        public int ApiTipoIndexValue
        {
            get => _raceUpload.ApiTipoIndexValue;
            set => _raceUpload.ApiTipoIndexValue = value;
        }

        public int ApiFreeEventIndex
        {
            get => _raceUpload.ApiFreeEventIndex;
            set => _raceUpload.ApiFreeEventIndex = value;
        }

        public string ApiRaceId
        {
            get => _raceUpload.ApiRaceId;
            set => _raceUpload.ApiRaceId = value;
        }

        public string ApiRemoteProcessedBasePath
        {
            get => _raceUpload.ApiRemoteProcessedBasePath;
            set => _raceUpload.ApiRemoteProcessedBasePath = value;
        }

        // Preview results for DataGrid
        public System.Collections.ObjectModel.ObservableCollection<AiResultItem> PreviewResults => _ai.PreviewResults;

        public double AiProgress
        {
            get => _ai.AiProgress;
            set => _ai.AiProgress = value;
        }

        private string BuildNumberAiIdleSummary()
        {
            var workerCount = ResolveNumberAiWorkerCount(UseNumberAiGpu, NumberAiWorkloadLevel);
            return $"In attesa. Carico {NumberAiWorkloadLevel}/5, {workerCount} worker, 0.00 img/s.";
        }

        private static string BuildNumberAiProgressSummary(AiExtractionProgressUpdate progress)
        {
            return $"{progress.ProcessedFiles}/{progress.TotalFiles} immagini, media {progress.AverageImagesPerSecond:F2} img/s, carico {progress.WorkloadLevel}/5, {progress.WorkerCount} worker.";
        }

        private static string BuildNumberAiCompletionSummary(AiExtractionRunSummary summary)
        {
            if (summary.TotalFiles == 0)
            {
                return "Nessuna immagine trovata per OCR.";
            }

            return $"Completato: {summary.ProcessedFiles}/{summary.TotalFiles} immagini, media finale {summary.AverageImagesPerSecond:F2} img/s, errori {summary.FailedFiles}, carico {summary.WorkloadLevel}/5, {summary.WorkerCount} worker.";
        }

        private List<string> LoadAvailableFonts()
        {
#if WINDOWS
            var fonts = new List<string>();
            using (var installedFonts = new InstalledFontCollection())
            {
                fonts.AddRange(installedFonts.Families.Select(f => f.Name));
            }
            return fonts;
#else
            return new List<string>();
#endif
        }

        private CancellationTokenSource? _mainToken;

        public CancellationTokenSource? MainToken
        {
            get => _mainToken;
            set
            {
                _mainToken = value;
                NotifyPropertyChanged();
            }
        }

        public string SourcePath
        {
            get => _paths.SourcePath;
            set => _paths.SourcePath = value;
        }

        public string DestinationPath
        {
            get => _paths.DestinationPath;
            set => _paths.DestinationPath = value;
        }

        public string HorizontalText
        {
            get => _visual.HorizontalText;
            set => _visual.HorizontalText = value;
        }

        public string VerticalText
        {
            get => _visual.VerticalText;
            set => _visual.VerticalText = value;
        }

        public bool OverwriteImages
        {
            get => _visual.OverwriteImages;
            set => _visual.OverwriteImages = value;
        }

        private bool _uiEnabled = true;

        public bool UiEnabled
        {
            get => _uiEnabled;
            set
            {
                _uiEnabled = value;
                NotifyPropertyChanged();
                NotifyPropertyChanged(nameof(UiDisabled));
            }
        }

        public bool UiDisabled => !_uiEnabled;

        public ProcessingStateViewModel Processing => _processing;
        public PathSettingsViewModel Paths => _paths;
        public VisualSettingsViewModel Visual => _visual;

        private void OnProcessingPropertyChanged(object? sender, PropertyChangedEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(e.PropertyName))
            {
                return;
            }

            // Keep existing DataModel bindings working while state lives in child viewmodel.
            NotifyPropertyChanged(e.PropertyName);
        }

        private void OnPathsPropertyChanged(object? sender, PropertyChangedEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(e.PropertyName))
            {
                return;
            }

            NotifyPropertyChanged(e.PropertyName);
        }

        private void OnAiPropertyChanged(object? sender, PropertyChangedEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(e.PropertyName))
            {
                return;
            }

            NotifyPropertyChanged(e.PropertyName);
            UpdateFaceEncoderCommandStates();
        }

        private void OnRaceUploadPropertyChanged(object? sender, PropertyChangedEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(e.PropertyName))
            {
                return;
            }

            NotifyPropertyChanged(e.PropertyName);
        }

        private void OnVisualPropertyChanged(object? sender, PropertyChangedEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(e.PropertyName))
            {
                return;
            }

            NotifyPropertyChanged(e.PropertyName);
        }

        public string SpeedCounter
        {
            get => _processing.SpeedCounter;
            set => _processing.SpeedCounter = value;
        }

        private int _chunkSize;

        public int ChunkSize
        {
            get => _chunkSize;
            set
            {
                _chunkSize = value;
                NotifyPropertyChanged();
            }
        }

        private int _threadsCount;

        public int ThreadsCount
        {
            get => _threadsCount;
            set
            {
                _threadsCount = value;
                NotifyPropertyChanged();
            }
        }

        // Thumbnail settings
        public string ThumbnailPrefix
        {
            get => _visual.ThumbnailPrefix;
            set => _visual.ThumbnailPrefix = value;
        }

        public int ThumbnailHeight
        {
            get => _visual.ThumbnailHeight;
            set => _visual.ThumbnailHeight = value;
        }

        public int ThumbnailWidth
        {
            get => _visual.ThumbnailWidth;
            set => _visual.ThumbnailWidth = value;
        }

        // Big photo settings
        public int PhotoBigHeight
        {
            get => _visual.PhotoBigHeight;
            set => _visual.PhotoBigHeight = value;
        }

        public int PhotoBigWidth
        {
            get => _visual.PhotoBigWidth;
            set => _visual.PhotoBigWidth = value;
        }

        // Font settings
        public int FontSize
        {
            get => _visual.FontSize;
            set => _visual.FontSize = value;
        }

        public int FontSizeThumbnail
        {
            get => _visual.FontSizeThumbnail;
            set => _visual.FontSizeThumbnail = value;
        }

        public string FontName
        {
            get => _visual.FontName;
            set => _visual.FontName = value;
        }

        public bool FontBold
        {
            get => _visual.FontBold;
            set => _visual.FontBold = value;
        }

        // Text settings
        public int TextTransparency
        {
            get => _visual.TextTransparency;
            set => _visual.TextTransparency = value;
        }

        public int TextMargin
        {
            get => _visual.TextMargin;
            set => _visual.TextMargin = value;
        }

        public string TextColorRGB
        {
            get => _visual.TextColorRGB;
            set => _visual.TextColorRGB = value;
        }

        public string TransparentColor
        {
            get => _visual.TransparentColor;
            set => _visual.TransparentColor = value;
        }

        public bool UseTransparentColor
        {
            get => _visual.UseTransparentColor;
            set => _visual.UseTransparentColor = value;
        }

        // Logo/Watermark settings
        public string LogoFile
        {
            get => _visual.LogoFile;
            set => _visual.LogoFile = value;
        }

        public int LogoHeight
        {
            get => _visual.LogoHeight;
            set => _visual.LogoHeight = value;
        }

        public int LogoWidth
        {
            get => _visual.LogoWidth;
            set => _visual.LogoWidth = value;
        }

        public int LogoMargin
        {
            get => _visual.LogoMargin;
            set => _visual.LogoMargin = value;
        }

        public int LogoTransparency
        {
            get => _visual.LogoTransparency;
            set => _visual.LogoTransparency = value;
        }

        // Image library selection (UI radio buttons bind to the boolean helpers)
        private string _imageLibrary = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? "System.Graphics" : "ImageSharp";

        /// <summary>
        /// Whether the application is running on Windows. Used by cross-platform UIs to show/hide Windows-only options.
        /// </summary>
        public bool IsRunningOnWindows => RuntimeInformation.IsOSPlatform(OSPlatform.Windows);

        /// <summary>
        /// The selected image processing library. Possible values: "System.Graphics" or "ImageSharp".
        /// This value is mirrored into PicSettings.ImageCreatorProvider so the runtime mapper picks the implementation.
        /// </summary>
        public string ImageLibrary
        {
            get => _imageLibrary;
            set
            {
                if (_imageLibrary == value) return;
                _imageLibrary = value;
                // Reflect selection into PicSettings so mapper can resolve at runtime
                _picSettings.ImageCreatorProvider = string.Equals(value, "ImageSharp", StringComparison.OrdinalIgnoreCase)
                    ? "ALTERNATE"
                    : "Sharp";
                NotifyPropertyChanged();
                NotifyPropertyChanged(nameof(UseSystemGraphics));
                NotifyPropertyChanged(nameof(UseImageSharp));
                NotifyPropertyChanged(nameof(IsRunningOnWindows));
            }
        }

        public bool UseSystemGraphics
        {
            get => string.Equals(ImageLibrary, "System.Graphics", StringComparison.OrdinalIgnoreCase);
            set
            {
                if (value) ImageLibrary = "System.Graphics";
                NotifyPropertyChanged();
            }
        }

        public bool UseImageSharp
        {
            get => string.Equals(ImageLibrary, "ImageSharp", StringComparison.OrdinalIgnoreCase);
            set
            {
                if (value) ImageLibrary = "ImageSharp";
                NotifyPropertyChanged();
            }
        }

        // Folder division settings
        private int _filesPerFolder = 99;
        public int FilesPerFolder
        {
            get => _filesPerFolder;
            set
            {
                _filesPerFolder = value;
                NotifyPropertyChanged();
            }
        }

        private string _folderSuffix = "";
        public string FolderSuffix
        {
            get => _folderSuffix;
            set
            {
                _folderSuffix = value;
                NotifyPropertyChanged();
            }
        }

        private int _counterDigits = 2;
        public int CounterDigits
        {
            get => _counterDigits;
            set
            {
                _counterDigits = value;
                NotifyPropertyChanged();
            }
        }

        // Vertical text settings
        public int VerticalTextSize
        {
            get => _visual.VerticalTextSize;
            set => _visual.VerticalTextSize = value;
        }

        public int VerticalTextMargin
        {
            get => _visual.VerticalTextMargin;
            set => _visual.VerticalTextMargin = value;
        }

        // JPEG compression settings
        public int JpegQuality
        {
            get => _visual.JpegQuality;
            set => _visual.JpegQuality = value;
        }

        public int JpegQualityThumbnail
        {
            get => _visual.JpegQualityThumbnail;
            set => _visual.JpegQualityThumbnail = value;
        }

        // CheckBox settings
        private bool _createThumbnails = true;
        public bool CreateThumbnails
        {
            get => _createThumbnails;
            set
            {
                _createThumbnails = value;
                NotifyPropertyChanged();
            }
        }

        private bool _automaticRotation;
        public bool AutomaticRotation
        {
            get => _automaticRotation;
            set
            {
                _automaticRotation = value;
                NotifyPropertyChanged();
            }
        }

        private bool _forceJpeg;
        public bool ForceJpeg
        {
            get => _forceJpeg;
            set
            {
                _forceJpeg = value;
                NotifyPropertyChanged();
            }
        }

        private bool _updateSubdirectories;
        public bool UpdateSubdirectories
        {
            get => _updateSubdirectories;
            set
            {
                _updateSubdirectories = value;
                NotifyPropertyChanged();
            }
        }

        private bool _createSubfolders;
        public bool CreateSubfolders
        {
            get => _createSubfolders;
            set
            {
                _createSubfolders = value;
                NotifyPropertyChanged();
            }
        }

        private bool _addTime;
        public bool AddTime
        {
            get => _addTime;
            set
            {
                _addTime = value;
                NotifyPropertyChanged();
            }
        }

        private bool _addRaceTime;
        public bool AddRaceTime
        {
            get => _addRaceTime;
            set
            {
                _addRaceTime = value;
                NotifyPropertyChanged();
            }
        }

        public bool AddLogo
        {
            get => _visual.AddLogo;
            set => _visual.AddLogo = value;
        }

        public bool KeepOriginalDimensions
        {
            get => _visual.KeepOriginalDimensions;
            set => _visual.KeepOriginalDimensions = value;
        }

        private bool _showDate;
        public bool ShowDate
        {
            get => _showDate;
            set
            {
                _showDate = value;
                NotifyPropertyChanged();
            }
        }

        private bool _showPhotoNumber;
        public bool ShowPhotoNumber
        {
            get => _showPhotoNumber;
            set
            {
                if (_showPhotoNumber == value) return;
                _showPhotoNumber = value;
                if (value)
                {
                    // ensure mutually exclusive choices
                    _addTimeToThumbnails = false;
                    _addTextToThumbnails = false;
                    _addNumberAndTimeToThumbnails = false;
                    _addRaceTimeToThumbnails = false;
                    NotifyPropertyChanged(nameof(AddTimeToThumbnails));
                    NotifyPropertyChanged(nameof(AddTextToThumbnails));
                    NotifyPropertyChanged(nameof(AddNumberAndTimeToThumbnails));
                    NotifyPropertyChanged(nameof(AddRaceTimeToThumbnails));
                }
                NotifyPropertyChanged();
                NotifyPropertyChanged(nameof(ThumbnailMode));
            }
        }

        private bool _shutdownSystem;
        public bool ShutdownSystem
        {
            get => _shutdownSystem;
            set
            {
                _shutdownSystem = value;
                NotifyPropertyChanged();
            }
        }

        // ComboBox position/alignment settings
        private string _verticalPosition = "Basso";
        public string VerticalPosition
        {
            get => _verticalPosition;
            set
            {
                _verticalPosition = value;
                NotifyPropertyChanged();
            }
        }

        private string _horizontalAlignment = "Centro";
        public string HorizontalAlignment
        {
            get => _horizontalAlignment;
            set
            {
                _horizontalAlignment = value;
                NotifyPropertyChanged();
            }
        }

        private string _logoHorizontalPosition = "Destra";
        public string LogoHorizontalPosition
        {
            get => _logoHorizontalPosition;
            set
            {
                _logoHorizontalPosition = value;
                NotifyPropertyChanged();
            }
        }

        private string _logoVerticalPosition = "Basso";
        public string LogoVerticalPosition
        {
            get => _logoVerticalPosition;
            set
            {
                _logoVerticalPosition = value;
                NotifyPropertyChanged();
            }
        }

        // RadioButton settings
        private bool _useProgressiveNumbering = true;
        public bool UseProgressiveNumbering
        {
            get => _useProgressiveNumbering;
            set
            {
                _useProgressiveNumbering = value;
                NotifyPropertyChanged();
            }
        }

        private bool _useFileNumbering;
        public bool UseFileNumbering
        {
            get => _useFileNumbering;
            set
            {
                _useFileNumbering = value;
                NotifyPropertyChanged();
            }
        }

        private bool _useParallelProcessing = true;
        public bool UseParallelProcessing
        {
            get => _useParallelProcessing;
            set
            {
                _useParallelProcessing = value;
                NotifyPropertyChanged();
            }
        }

        private bool _useSequentialProcessing;
        public bool UseSequentialProcessing
        {
            get => _useSequentialProcessing;
            set
            {
                _useSequentialProcessing = value;
                NotifyPropertyChanged();
            }
        }

        // Additional settings that were missing
        private bool _addTimeToThumbnails;
        public bool AddTimeToThumbnails
        {
            get => _thumbnailOption == ThumbnailOptionEnum.Time;
            set
            {
                if (value)
                {
                    ThumbnailOption = ThumbnailOptionEnum.Time;
                }
                else if (_thumbnailOption == ThumbnailOptionEnum.Time)
                {
                    ThumbnailOption = ThumbnailOptionEnum.None;
                }
                NotifyPropertyChanged();
            }
        }

        private bool _showFileNameOnThumbnails;
        public bool ShowFileNameOnThumbnails
        {
            get => _thumbnailOption == ThumbnailOptionEnum.FileName;
            set
            {
                if (value)
                    ThumbnailOption = ThumbnailOptionEnum.FileName;
                else if (_thumbnailOption == ThumbnailOptionEnum.FileName)
                    ThumbnailOption = ThumbnailOptionEnum.None;
                NotifyPropertyChanged();
            }
        }

        private DateTime _raceStartDate = DateTime.Now;
        public DateTime RaceStartDate
        {
            get => _raceStartDate;
            set
            {
                _raceStartDate = value;
                NotifyPropertyChanged();
            }
        }

        private string _timeLabel = "";
        public string TimeLabel
        {
            get => _timeLabel;
            set
            {
                _timeLabel = value;
                NotifyPropertyChanged();
            }
        }

        private string _bigPhotoSuffix = "";
        public string BigPhotoSuffix
        {
            get => _bigPhotoSuffix;
            set
            {
                _bigPhotoSuffix = value;
                NotifyPropertyChanged();
            }
        }

        private bool _addTextToThumbnails;
        public bool AddTextToThumbnails
        {
            get => _thumbnailOption == ThumbnailOptionEnum.Text;
            set
            {
                if (value)
                    ThumbnailOption = ThumbnailOptionEnum.Text;
                else if (_thumbnailOption == ThumbnailOptionEnum.Text)
                    ThumbnailOption = ThumbnailOptionEnum.None;
                NotifyPropertyChanged();
            }
        }

        private bool _addRaceTimeToThumbnails;
        public bool AddRaceTimeToThumbnails
        {
            get => _thumbnailOption == ThumbnailOptionEnum.RaceTime;
            set
            {
                if (value)
                    ThumbnailOption = ThumbnailOptionEnum.RaceTime;
                else if (_thumbnailOption == ThumbnailOptionEnum.RaceTime)
                    ThumbnailOption = ThumbnailOptionEnum.None;
                NotifyPropertyChanged();
            }
        }

        private bool _addNumberAndTimeToThumbnails;
        public bool AddNumberAndTimeToThumbnails
        {
            get => _thumbnailOption == ThumbnailOptionEnum.FileNameAndTime;
            set
            {
                if (value)
                    ThumbnailOption = ThumbnailOptionEnum.FileNameAndTime;
                else if (_thumbnailOption == ThumbnailOptionEnum.FileNameAndTime)
                    ThumbnailOption = ThumbnailOptionEnum.None;
                NotifyPropertyChanged();
            }
        }

        // New enum and authoritative property for thumbnail selection
        public enum ThumbnailOptionEnum
        {
            None = 0,
            Text = 1,
            FileName = 2,
            Time = 3,
            FileNameAndTime = 4,
            RaceTime = 5
        }

        private ThumbnailOptionEnum _thumbnailOption = ThumbnailOptionEnum.None;

        // Name matches DTO property so SettingsService mapping works
        public ThumbnailOptionEnum ThumbnailOption
        {
            get => _thumbnailOption;
            set
            {
                if (_thumbnailOption == value) return;
                _thumbnailOption = value;
                // Notify all dependent properties so UI updates
                NotifyPropertyChanged();
                NotifyPropertyChanged(nameof(AddTextToThumbnails));
                NotifyPropertyChanged(nameof(AddTimeToThumbnails));
                NotifyPropertyChanged(nameof(ShowPhotoNumber));
                NotifyPropertyChanged(nameof(AddNumberAndTimeToThumbnails));
                NotifyPropertyChanged(nameof(AddRaceTimeToThumbnails));
                NotifyPropertyChanged(nameof(ShowFileNameOnThumbnails));
                NotifyPropertyChanged(nameof(ThumbnailMode));
            }
        }

        // Helper int property to bind ComboBox SelectedIndex in the WinForms designer
        public int ThumbnailOptionIndex
        {
            get => (int)ThumbnailOption;
            set
            {
                var opt = (ThumbnailOptionEnum)value;
                if (opt == ThumbnailOption) return;
                ThumbnailOption = opt;
                NotifyPropertyChanged();
            }
        }

        // Single authoritative thumbnail mode string to avoid conflicting bindings
        // Possible values: "None", "Text", "Time", "Number", "NumberAndTime", "RaceTime"
        public string ThumbnailMode
        {
            get
            {
                return _thumbnailOption switch
                {
                    ThumbnailOptionEnum.Text => "Text",
                    ThumbnailOptionEnum.Time => "Time",
                    ThumbnailOptionEnum.FileName => "Number",
                    ThumbnailOptionEnum.FileNameAndTime => "NumberAndTime",
                    ThumbnailOptionEnum.RaceTime => "RaceTime",
                    _ => "None",
                };
            }
            set
            {
                // Map incoming string to enum and set the authoritative property
                switch ((value ?? string.Empty).ToLowerInvariant())
                {
                    case "text":
                        ThumbnailOption = ThumbnailOptionEnum.Text;
                        break;
                    case "time":
                        ThumbnailOption = ThumbnailOptionEnum.Time;
                        break;
                    case "number":
                        ThumbnailOption = ThumbnailOptionEnum.FileName;
                        break;
                    case "numberandtime":
                        ThumbnailOption = ThumbnailOptionEnum.FileNameAndTime;
                        break;
                    case "racetime":
                        ThumbnailOption = ThumbnailOptionEnum.RaceTime;
                        break;
                    default:
                        ThumbnailOption = ThumbnailOptionEnum.None;
                        break;
                }
            }
        }

        // Image processing progress and status
        public string ProcessingStatus
        {
            get => _processing.ProcessingStatus;
            set => _processing.ProcessingStatus = value;
        }

        public int ProcessedImagesCount
        {
            get => _processing.ProcessedImagesCount;
            set => _processing.ProcessedImagesCount = value;
        }

        public int TotalImagesCount
        {
            get => _processing.TotalImagesCount;
            set => _processing.TotalImagesCount = value;
        }

        public int ProgressBarValue
        {
            get => _processing.ProgressBarValue;
            set => _processing.ProgressBarValue = value;
        }

        public int ProgressBarMaximum
        {
            get => _processing.ProgressBarMaximum;
            set => _processing.ProgressBarMaximum = value;
        }

        private void Test(object parameter)
        {
            Debug.WriteLine("Yep");
            this.UiEnabled = !this.UiEnabled;
        }

        private async Task TestAsync()
        {
            Debug.WriteLine("Yep c");
        }

        public async Task ProcessImages()
        {
            _logger.LogInformation("Avvio elaborazione...");
            UiEnabled = false;

            MainToken?.Dispose();
            MainToken = new CancellationTokenSource();
            var token = MainToken.Token;

            // Normalize paths
            _paths.NormalizePaths();

            // Reset counters
            _processing.ResetForRun();

            // Update PicSettings from DataModel using AutoMapper
            _mapper.Map(this, _picSettings);
            // Explicitly ensure thumbnail-related flags are applied to PicSettings
            // because AutoMapper may not map differently-named properties.
            try
            {
                _picSettings.AggiungiScritteMiniature = this.AddTextToThumbnails;
                _picSettings.UsaOrarioMiniatura = this.AddTimeToThumbnails;
                _picSettings.AggNumTempMin = this.AddNumberAndTimeToThumbnails;
                _picSettings.AggTempoGaraMin = this.AddRaceTimeToThumbnails;
                _picSettings.CreaMiniature = this.CreateThumbnails;
                _picSettings.LarghezzaSmall = this.ThumbnailWidth;
                _picSettings.AltezzaSmall = this.ThumbnailHeight;
                _picSettings.DimMin = this.FontSizeThumbnail;
                _picSettings.JpegQualityMin = this.JpegQualityThumbnail;
            }
            catch
            {
                // Best-effort; do not fail processing on mapping issues
            }

            var imageCreationOptions = new ImageCreationService.Options
            {
                AggiornaSottodirectory = UpdateSubdirectories,
                CreaSottocartelle = CreateSubfolders,
                FilePerCartella = FilesPerFolder,
                SuffissoCartelle = FolderSuffix,
                CifreContatore = CounterDigits,
                NumerazioneType = UseProgressiveNumbering ? NumerazioneType.Progressiva : NumerazioneType.Files,
                SourcePath = SourcePath,
                DestinationPath = DestinationPath,
                MaxThreads = ThreadsCount,
                ChunksSize = ChunkSize,
                LinearExecution = UseSequentialProcessing
            };

            try
            {
                var runResult = await _imageProcessingCoordinator.RunAsync(
                    new ImageProcessingRunRequest { Options = imageCreationOptions },
                    token,
                    update =>
                    {
                        ProcessedImagesCount = update.Processed;
                        TotalImagesCount = update.Total;
                        ProgressBarMaximum = update.Total;
                        ProgressBarValue = update.Processed;
                        ProcessingStatus = update.Status;
                    },
                    speed => { SpeedCounter = speed; }).ConfigureAwait(false);

                SpeedCounter = runResult.FinalSpeedCounter;
            }
            catch (OperationCanceledException)
            {
                _logger.LogInformation("Operazione Cancellata");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Errore durante l'elaborazione delle immagini");
                ProcessingStatus = $"Errore: {ex.Message}";
            }
            finally
            {
                MainToken?.Dispose();
                MainToken = null;
            }

            ProcessingStatus = "Finito";
            UiEnabled = true;
        }

        public async Task RunNumberAiAsync(CancellationToken token)
        {
            await RunAiExtractionCoreAsync(token, useDestination: true, recursive: true, failOnInvalidPath: true).ConfigureAwait(false);
        }

        public async Task RunFaceAiAsync(CancellationToken token)
        {
            using var registration = token.Register(() => _ = StopFaceEncoderAsync("Arresto face encoder richiesto dalla CLI.", waitForExit: true));
            await RunFaceEncoderAsync().ConfigureAwait(false);
        }

        private async Task CancelOperation()
        {
            try
            {
                var tokenSource = MainToken;
                if (tokenSource is not null)
                {
                    // Cancel synchronously and return to caller. Some CTSource implementations
                    // may provide async helpers but cancelling is immediate.
                    try
                    {
                        tokenSource.Cancel();
                    }
                    catch (Exception ex)
                    {
                        _logger.LogWarning(ex, "Exception while cancelling token");
                    }
                }

                UiEnabled = true;
            }
            catch (Exception e)
            {
                _logger.LogError(e, "Error canceling the token");
                _logger.LogInformation("Ignora questo errore");
            }
        }

        public async Task StopFaceEncoderAsync(string reason, bool waitForExit = true)
        {
            var trackedProcess = GetTrackedFaceEncoderProcess();
            var ownsProcess = false;
            var process = trackedProcess;

            if (process is null)
            {
                process = FindConfiguredFaceEncoderProcess();
                ownsProcess = process is not null;
            }

            if (process is null)
            {
                await InvokeOnUiThreadAsync(() =>
                {
                    IsFaceEncoderRunning = false;
                    FaceStatusMessage = "Face encoder non in esecuzione.";
                }).ConfigureAwait(false);
                return;
            }

            try
            {
                await InvokeOnUiThreadAsync(() => FaceStatusMessage = reason).ConfigureAwait(false);

                var gracefulStopRequested = TryRequestFaceEncoderStop(process);
                if (waitForExit)
                {
                    var exited = await WaitForProcessExitAsync(process, TimeSpan.FromSeconds(5)).ConfigureAwait(false);
                    if (!exited)
                    {
                        try
                        {
                            process.Kill(entireProcessTree: true);
                            exited = await WaitForProcessExitAsync(process, TimeSpan.FromSeconds(5)).ConfigureAwait(false);
                        }
                        catch (Exception ex)
                        {
                            _logger.LogWarning(ex, "Unable to terminate face encoder process {ProcessId}", process.Id);
                        }
                    }

                    await InvokeOnUiThreadAsync(() =>
                    {
                        IsFaceEncoderRunning = !exited && IsProcessAlive(process);
                        FaceStatusMessage = exited
                            ? "Face encoder arrestato."
                            : gracefulStopRequested
                                ? "Segnale di arresto inviato al face encoder."
                                : "Arresto forzato del face encoder richiesto.";
                    }).ConfigureAwait(false);
                }
            }
            finally
            {
                if (ownsProcess)
                {
                    process.Dispose();
                }
            }
        }

        private bool CanRunFaceEncoder()
        {
            return !IsFaceEncoderRunning;
        }

        private bool CanStopFaceEncoder()
        {
            return IsFaceEncoderRunning;
        }

        private void UpdateFaceEncoderCommandStates()
        {
            _startFaceEncoderCommand?.RaiseCanExecuteChanged();
            _stopFaceEncoderCommand?.RaiseCanExecuteChanged();
        }

        private async Task RunFaceEncoderAsync()
        {
            if (IsFaceEncoderRunning)
            {
                FaceStatusMessage = "Face encoder gia in esecuzione.";
                return;
            }

            var executableRootPath = NormalizeFilePathArgument(FaceExecutablePath);
            var outputFolderPath = NormalizeDirectoryPathArgument(FaceOutputFolderPath);
            var imagesFolder = NormalizeDirectoryPathArgument(DestinationPath);
            var executablePath = ResolveConfiguredFaceEncoderExecutablePath(executableRootPath, UseFaceGpu);

            if (string.IsNullOrWhiteSpace(executableRootPath))
            {
                FaceStatusMessage = "Percorso cartella face encoder non valido.";
                return;
            }

            if (string.IsNullOrWhiteSpace(executablePath) || !File.Exists(executablePath))
            {
                FaceStatusMessage = UseFaceGpu
                    ? "Impossibile trovare face_encoder_gpu.exe nella cartella selezionata."
                    : "Impossibile trovare face_encoder_cpu.exe nella cartella selezionata.";
                return;
            }

            if (string.IsNullOrWhiteSpace(imagesFolder) || !Directory.Exists(imagesFolder))
            {
                FaceStatusMessage = "Cartella Destinazione non valida.";
                return;
            }

            if (string.IsNullOrWhiteSpace(outputFolderPath))
            {
                FaceStatusMessage = "Inserisci la cartella di output per encodings e log.";
                return;
            }

            try
            {
                Directory.CreateDirectory(outputFolderPath);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Unable to create face output directory: {OutputFolderPath}", outputFolderPath);
                FaceStatusMessage = "Impossibile creare la cartella di output.";
                return;
            }

            var parallelism = NormalizeFaceParallelism(FaceParallelism);
            var minSize = NormalizeFaceMinSize(FaceMinSize);
            var outputFiles = BuildFaceEncoderOutputPaths(outputFolderPath, imagesFolder, DateTime.Now);

            FaceExecutablePath = executableRootPath;
            FaceOutputFolderPath = outputFolderPath;
            FaceCommandOutput = string.Empty;
            FaceStatusMessage = "Esecuzione face encoder in corso...";

            var transcriptLines = new StringBuilder();
            var outputLines = new StringBuilder();
            var errorLines = new StringBuilder();

            try
            {
                var processStartInfo = new ProcessStartInfo
                {
                    FileName = executablePath,
                    WorkingDirectory = Path.GetDirectoryName(executablePath) ?? Environment.CurrentDirectory,
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true,
                    RedirectStandardInput = false,
                    CreateNoWindow = false,
                };

                processStartInfo.ArgumentList.Add("--images");
                processStartInfo.ArgumentList.Add(imagesFolder);
                processStartInfo.ArgumentList.Add("--out");
                processStartInfo.ArgumentList.Add(outputFiles.OutputFilePath);
                processStartInfo.ArgumentList.Add("--log");
                processStartInfo.ArgumentList.Add(outputFiles.LogFilePath);

                if (FaceRecursive)
                {
                    processStartInfo.ArgumentList.Add("--recursive");
                }

                if (FaceIncludeThumbnails)
                {
                    processStartInfo.ArgumentList.Add("--include-tn");
                }

                processStartInfo.ArgumentList.Add(UseFaceGpu ? "--multiprocess" : "--multicore");
                processStartInfo.ArgumentList.Add(parallelism.ToString());
                processStartInfo.ArgumentList.Add("--min-size");
                processStartInfo.ArgumentList.Add(minSize.ToString());

                if (FaceUpsample)
                {
                    processStartInfo.ArgumentList.Add("--upsample");
                }

                using var process = new Process { StartInfo = processStartInfo, EnableRaisingEvents = true };
                process.OutputDataReceived += (_, args) => AppendFaceProcessOutput(outputLines, transcriptLines, args.Data, isError: false);
                process.ErrorDataReceived += (_, args) => AppendFaceProcessOutput(errorLines, transcriptLines, args.Data, isError: true);
                process.Exited += (_, _) =>
                {
                    _ = InvokeOnUiThreadAsync(() =>
                    {
                        if (!ComputeIsFaceEncoderRunning())
                        {
                            IsFaceEncoderRunning = false;
                        }
                    });
                };

                if (!process.Start())
                {
                    throw new InvalidOperationException("Avvio face encoder fallito.");
                }

                _hasStartedFaceEncoderInSession = true;
                EnsureFaceEncoderWatcherStarted();
                TrackFaceEncoderProcess(process);
                await InvokeOnUiThreadAsync(() => IsFaceEncoderRunning = true).ConfigureAwait(false);

                if (UseFaceGpu)
                {
                    StartFaceEncoderLogWatcher(outputFiles.LogFilePath, outputLines, transcriptLines);
                }

                process.BeginOutputReadLine();
                process.BeginErrorReadLine();
                await process.WaitForExitAsync().ConfigureAwait(false);

                var summary = BuildFaceEncoderSummary(process.ExitCode, processStartInfo, outputFiles.OutputFilePath, outputFiles.LogFilePath, outputLines, errorLines);
                await InvokeOnUiThreadAsync(() =>
                {
                    FaceCommandOutput = string.IsNullOrWhiteSpace(FaceCommandOutput)
                        ? summary
                        : $"{FaceCommandOutput.TrimEnd()}\n\n{summary}";
                    FaceStatusMessage = process.ExitCode == 0
                        ? "Face encoder completato."
                        : $"Face encoder terminato con errore (code {process.ExitCode}).";
                }).ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                Console.Error.WriteLine(ex);
                _logger.LogError(ex, "Face encoder execution failed.");
                await InvokeOnUiThreadAsync(() =>
                {
                    FaceCommandOutput = ex.ToString();
                    FaceStatusMessage = "Errore durante esecuzione face encoder.";
                }).ConfigureAwait(false);
            }
            finally
            {
                await StopFaceEncoderLogWatcherAsync().ConfigureAwait(false);
                ClearTrackedFaceEncoderProcess();
                await InvokeOnUiThreadAsync(() => IsFaceEncoderRunning = ComputeIsFaceEncoderRunning()).ConfigureAwait(false);
            }
        }

        private async Task WatchFaceEncoderProcessAsync(CancellationToken token)
        {
            using var timer = new PeriodicTimer(TimeSpan.FromSeconds(1));

            try
            {
                while (await timer.WaitForNextTickAsync(token).ConfigureAwait(false))
                {
                    if (!_hasStartedFaceEncoderInSession)
                    {
                        continue;
                    }

                    var isRunning = ComputeIsFaceEncoderRunning();
                    if (isRunning != IsFaceEncoderRunning)
                    {
                        await InvokeOnUiThreadAsync(() => IsFaceEncoderRunning = isRunning).ConfigureAwait(false);
                    }
                }
            }
            catch (OperationCanceledException)
            {
                // App shutdown.
            }
        }

        private void EnsureFaceEncoderWatcherStarted()
        {
            if (_faceEncoderWatcherTask is not null)
            {
                return;
            }

            _faceEncoderWatcherTokenSource = new CancellationTokenSource();
            _faceEncoderWatcherTask = WatchFaceEncoderProcessAsync(_faceEncoderWatcherTokenSource.Token);
        }

        private void StartFaceEncoderLogWatcher(string logFilePath, StringBuilder outputLines, StringBuilder transcriptLines)
        {
            _faceEncoderLogWatcherTokenSource?.Cancel();
            _faceEncoderLogWatcherTokenSource?.Dispose();

            _faceEncoderLogWatcherTokenSource = new CancellationTokenSource();
            _faceEncoderLogWatcherTask = WatchFaceEncoderLogFileAsync(logFilePath, outputLines, transcriptLines, _faceEncoderLogWatcherTokenSource.Token);
        }

        private async Task StopFaceEncoderLogWatcherAsync()
        {
            var tokenSource = _faceEncoderLogWatcherTokenSource;
            var task = _faceEncoderLogWatcherTask;

            _faceEncoderLogWatcherTokenSource = null;
            _faceEncoderLogWatcherTask = null;

            if (tokenSource is null)
            {
                return;
            }

            try
            {
                await tokenSource.CancelAsync().ConfigureAwait(false);
                if (task is not null)
                {
                    await task.ConfigureAwait(false);
                }
            }
            catch (OperationCanceledException)
            {
                // Expected when shutting down the watcher.
            }
            finally
            {
                tokenSource.Dispose();
            }
        }

        private async Task WatchFaceEncoderLogFileAsync(string logFilePath, StringBuilder outputLines, StringBuilder transcriptLines, CancellationToken token)
        {
            long filePosition = 0;

            while (!token.IsCancellationRequested)
            {
                try
                {
                    if (File.Exists(logFilePath))
                    {
                        using var stream = new FileStream(logFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
                        if (filePosition > stream.Length)
                        {
                            filePosition = 0;
                        }

                        stream.Seek(filePosition, SeekOrigin.Begin);
                        using var reader = new StreamReader(stream);
                        while (!reader.EndOfStream)
                        {
                            var line = await reader.ReadLineAsync(token).ConfigureAwait(false);
                            AppendFaceProcessOutput(outputLines, transcriptLines, line, isError: false);
                        }

                        filePosition = stream.Position;
                    }
                }
                catch (OperationCanceledException)
                {
                    throw;
                }
                catch (IOException)
                {
                    // Retry on the next polling interval while the encoder is still writing.
                }
                catch (UnauthorizedAccessException)
                {
                    // Retry on the next polling interval if the log file is transiently locked.
                }

                await Task.Delay(TimeSpan.FromMilliseconds(250), token).ConfigureAwait(false);
            }
        }

        private void RefreshFaceExecutableCapabilities()
        {
            var executableRoot = NormalizeFilePathArgument(_ai.FaceExecutablePath);
            var hasCpu = !string.IsNullOrWhiteSpace(ResolveConfiguredFaceEncoderExecutablePath(executableRoot, useGpu: false));
            var hasGpu = !string.IsNullOrWhiteSpace(ResolveConfiguredFaceEncoderExecutablePath(executableRoot, useGpu: true));

            _ai.FaceGpuOptionEnabled = hasCpu && hasGpu;

            if (hasGpu && !hasCpu)
            {
                _ai.UseFaceGpu = true;
            }
            else if (!hasGpu)
            {
                _ai.UseFaceGpu = false;
            }
        }

        private void RefreshNumberAiGpuCapabilities()
        {
            if (!TryBuildNumberAiModelConfiguration(out var configuration))
            {
                NumberAiGpuOptionEnabled = false;
                _ai.UseNumberAiGpu = false;
                return;
            }

            NumberAiGpuOptionEnabled = NumberRecognitionEngine.TryValidateGpuRuntime(configuration, _logger, out _);
            if (!NumberAiGpuOptionEnabled)
            {
                _ai.UseNumberAiGpu = false;
            }
        }

        private void SetUseNumberAiGpu(bool value)
        {
            if (!NumberAiGpuOptionEnabled)
            {
                _ai.UseNumberAiGpu = false;
                return;
            }

            _ai.UseNumberAiGpu = value;
        }

        private bool TryBuildNumberAiModelConfiguration(out ModelConfiguration configuration)
        {
            configuration = null!;

            if (string.IsNullOrWhiteSpace(ModelsFolderPath))
            {
                return false;
            }

            var modelsRoot = Path.GetFullPath(ModelsFolderPath.Trim().Trim('"'));
            if (!Directory.Exists(modelsRoot))
            {
                return false;
            }

            configuration = new ModelConfiguration
            {
                DetectionCfg = Path.Combine(modelsRoot, "detection.cfg"),
                DetectionWeights = Path.Combine(modelsRoot, "detection.weights"),
                RecognitionCfg = Path.Combine(modelsRoot, "recognition.cfg"),
                RecognitionWeights = Path.Combine(modelsRoot, "recognition.weights"),
                UseGpu = true
            };

            return File.Exists(configuration.DetectionCfg)
                && File.Exists(configuration.DetectionWeights)
                && File.Exists(configuration.RecognitionCfg)
                && File.Exists(configuration.RecognitionWeights);
        }

        private Task ShowErrorMessageAsync(string title, string message)
        {
            return InvokeOnUiThreadAsync(() =>
            {
                ShowMessageRequested?.Invoke(this, Tuple.Create(title, message, 0));
            });
        }

        private void SetUseFaceGpu(bool value)
        {
            var currentValue = _ai.UseFaceGpu;
            if (!FaceGpuOptionEnabled)
            {
                return;
            }

            if (currentValue == value)
            {
                return;
            }

            _ai.UseFaceGpu = value;

            var previousRecommendedUpsample = GetRecommendedFaceUpsample(currentValue);
            if (_ai.FaceUpsample == previousRecommendedUpsample)
            {
                _ai.FaceUpsample = GetRecommendedFaceUpsample(value);
            }
        }

        private void TrackFaceEncoderProcess(Process process)
        {
            lock (_faceEncoderProcessLock)
            {
                _faceEncoderProcess = process;
            }
        }

        private void ClearTrackedFaceEncoderProcess()
        {
            lock (_faceEncoderProcessLock)
            {
                if (_faceEncoderProcess is not null && _faceEncoderProcess.HasExited)
                {
                    _faceEncoderProcess = null;
                    return;
                }

                _faceEncoderProcess = null;
            }
        }

        private Process? GetTrackedFaceEncoderProcess()
        {
            lock (_faceEncoderProcessLock)
            {
                if (_faceEncoderProcess is null)
                {
                    return null;
                }

                if (_faceEncoderProcess.HasExited)
                {
                    _faceEncoderProcess = null;
                    return null;
                }

                return _faceEncoderProcess;
            }
        }

        private Process? FindConfiguredFaceEncoderProcess()
        {
            var configuredExecutablePath = ResolveConfiguredFaceEncoderExecutablePath(FaceExecutablePath, UseFaceGpu);
            if (string.IsNullOrWhiteSpace(configuredExecutablePath))
            {
                return null;
            }

            var processName = Path.GetFileNameWithoutExtension(configuredExecutablePath);
            foreach (var process in Process.GetProcessesByName(processName))
            {
                if (!IsProcessAlive(process))
                {
                    process.Dispose();
                    continue;
                }

                if (IsMatchingProcessPath(process, configuredExecutablePath))
                {
                    return process;
                }

                process.Dispose();
            }

            return null;
        }

        private bool ComputeIsFaceEncoderRunning()
        {
            var trackedProcess = GetTrackedFaceEncoderProcess();
            if (trackedProcess is not null)
            {
                return true;
            }

            if (!_hasStartedFaceEncoderInSession)
            {
                return false;
            }

            using var discoveredProcess = FindConfiguredFaceEncoderProcess();
            return discoveredProcess is not null;
        }

        private static bool IsProcessAlive(Process process)
        {
            try
            {
                return !process.HasExited;
            }
            catch
            {
                return false;
            }
        }

        private static bool IsMatchingProcessPath(Process process, string configuredExecutablePath)
        {
            try
            {
                var processPath = process.MainModule?.FileName;
                return !string.IsNullOrWhiteSpace(processPath)
                    && string.Equals(Path.GetFullPath(processPath), Path.GetFullPath(configuredExecutablePath), StringComparison.OrdinalIgnoreCase);
            }
            catch
            {
                return false;
            }
        }

        private bool TryRequestFaceEncoderStop(Process process)
        {
            if (!IsProcessAlive(process))
            {
                return true;
            }

#if WINDOWS
            if (Program.TrySendConsoleInterrupt(process.Id))
            {
                return true;
            }
#endif

            try
            {
                return process.CloseMainWindow();
            }
            catch (Exception ex)
            {
                _logger.LogWarning(ex, "Unable to request graceful stop for face encoder process {ProcessId}", process.Id);
                return false;
            }
        }

        private static async Task<bool> WaitForProcessExitAsync(Process process, TimeSpan timeout)
        {
            if (!IsProcessAlive(process))
            {
                return true;
            }

            using var cancellationTokenSource = new CancellationTokenSource(timeout);
            try
            {
                await process.WaitForExitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
                return true;
            }
            catch (OperationCanceledException)
            {
                return !IsProcessAlive(process);
            }
        }

        private void AppendFaceProcessOutput(StringBuilder builder, StringBuilder transcriptBuilder, string? line, bool isError)
        {
            if (string.IsNullOrWhiteSpace(line))
            {
                return;
            }

            lock (builder)
            {
                builder.AppendLine(line);
            }

            if (isError)
            {
                Console.Error.WriteLine(line);
            }
            else
            {
                Console.WriteLine(line);
            }

            string transcript;
            lock (transcriptBuilder)
            {
                if (isError)
                {
                    transcriptBuilder.Append("[stderr] ");
                }

                transcriptBuilder.AppendLine(line);
                transcript = transcriptBuilder.ToString();
            }

            _ = InvokeOnUiThreadAsync(() => FaceCommandOutput = transcript);
        }

        internal static string? ResolveConfiguredFaceEncoderExecutablePath(string configuredPath, bool useGpu)
        {
            var variant = useGpu ? "gpu" : "cpu";
            foreach (var candidate in EnumerateFaceEncoderExecutableCandidates(configuredPath, variant))
            {
                if (File.Exists(candidate))
                {
                    return candidate;
                }
            }

            return null;
        }

        internal static (string OutputFilePath, string LogFilePath) BuildFaceEncoderOutputPaths(string outputFolderPath, string imagesFolderPath, DateTime timestamp)
        {
            var safeRaceName = BuildSafeFaceEncoderRaceName(imagesFolderPath);
            var timestampToken = timestamp.ToString("yyyyMMdd_HHmmss");

            return (
                Path.Combine(outputFolderPath, $"face_encodings_{timestampToken}_{safeRaceName}.pkl"),
                Path.Combine(outputFolderPath, $"encoder_log_{timestampToken}_{safeRaceName}.txt"));
        }

        internal static string BuildSafeFaceEncoderRaceName(string imagesFolderPath)
        {
            var raceName = new DirectoryInfo(imagesFolderPath).Name;
            if (string.IsNullOrWhiteSpace(raceName))
            {
                return "race";
            }

            var invalidChars = Path.GetInvalidFileNameChars();
            var builder = new StringBuilder(raceName.Length);
            var previousWasSeparator = false;

            foreach (var currentChar in raceName)
            {
                if (char.IsWhiteSpace(currentChar) || invalidChars.Contains(currentChar))
                {
                    if (!previousWasSeparator)
                    {
                        builder.Append('_');
                        previousWasSeparator = true;
                    }

                    continue;
                }

                builder.Append(currentChar);
                previousWasSeparator = false;
            }

            return builder.ToString().Trim('_') switch
            {
                "" => "race",
                var sanitized => sanitized
            };
        }

        private static IEnumerable<string> EnumerateFaceEncoderExecutableCandidates(string configuredPath, string variant)
        {
            var normalizedPath = NormalizeFilePathArgument(configuredPath);
            if (string.IsNullOrWhiteSpace(normalizedPath))
            {
                yield break;
            }

            var executableName = $"face_encoder_{variant}.exe";

            if (File.Exists(normalizedPath))
            {
                var fileDirectory = Path.GetDirectoryName(normalizedPath);
                if (!string.IsNullOrWhiteSpace(fileDirectory))
                {
                    yield return Path.Combine(fileDirectory, executableName);

                    var parentDirectory = Directory.GetParent(fileDirectory)?.FullName;
                    if (!string.IsNullOrWhiteSpace(parentDirectory))
                    {
                        yield return Path.Combine(parentDirectory, $"face_encoder_{variant}", executableName);
                    }
                }

                yield return normalizedPath;
                yield break;
            }

            yield return Path.Combine(normalizedPath, executableName);
            yield return Path.Combine(normalizedPath, $"face_encoder_{variant}", executableName);

            var leafName = Path.GetFileName(normalizedPath.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar));
            if (leafName.Equals("face_encoder_cpu", StringComparison.OrdinalIgnoreCase)
                || leafName.Equals("face_encoder_gpu", StringComparison.OrdinalIgnoreCase))
            {
                var parentDirectory = Directory.GetParent(normalizedPath)?.FullName;
                if (!string.IsNullOrWhiteSpace(parentDirectory))
                {
                    yield return Path.Combine(parentDirectory, $"face_encoder_{variant}", executableName);
                }
            }
        }

        private static int NormalizeFaceParallelism(int value)
        {
            return value is >= 1 and <= 5 ? value : 3;
        }

        private static int NormalizeNumberAiWorkloadLevel(int value)
        {
            return value is >= 1 and <= 5 ? value : 3;
        }

        private static int ResolveNumberAiWorkerCount(bool useGpu, int workloadLevel)
        {
            var normalized = NormalizeNumberAiWorkloadLevel(workloadLevel);
            var maxWorkers = Math.Max(1, Environment.ProcessorCount);
            var requestedWorkers = useGpu
                ? normalized switch
                {
                    1 => 1,
                    2 => 2,
                    3 => 4,
                    4 => 6,
                    _ => 8
                }
                : normalized switch
                {
                    1 => 1,
                    2 => 2,
                    3 => 3,
                    4 => 4,
                    _ => 5
                };

            return Math.Min(requestedWorkers, maxWorkers);
        }

        private static int NormalizeFaceMinSize(int value)
        {
            return value > 0 ? value : 35;
        }

        private static bool GetRecommendedFaceUpsample(bool useGpu)
        {
            return !useGpu;
        }

        private static string BuildFaceEncoderSummary(
            int exitCode,
            ProcessStartInfo processStartInfo,
            string outputFilePath,
            string logFilePath,
            StringBuilder outputLines,
            StringBuilder errorLines)
        {
            var summary = new StringBuilder();
            summary.AppendLine($"Exit code: {exitCode}");
            summary.AppendLine($"Command: {processStartInfo.FileName} {string.Join(" ", processStartInfo.ArgumentList)}");
            summary.AppendLine($"Output file: {outputFilePath}");
            summary.AppendLine($"Log file: {logFilePath}");

            lock (outputLines)
            {
                if (outputLines.Length > 0)
                {
                    summary.AppendLine();
                    summary.AppendLine("STDOUT:");
                    summary.Append(outputLines);
                }
            }

            lock (errorLines)
            {
                if (errorLines.Length > 0)
                {
                    summary.AppendLine();
                    summary.AppendLine("STDERR:");
                    summary.Append(errorLines);
                }
            }

            return summary.ToString();
        }

        private static string NormalizeDirectoryPathArgument(string value)
        {
            if (string.IsNullOrWhiteSpace(value))
            {
                return string.Empty;
            }

            var normalized = value.Trim().Trim('"');
            var root = Path.GetPathRoot(normalized);
            if (!string.IsNullOrEmpty(root) && normalized.Length > root.Length)
            {
                normalized = normalized.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
            }

            return normalized;
        }

        private static string NormalizeFilePathArgument(string value)
        {
            if (string.IsNullOrWhiteSpace(value))
            {
                return string.Empty;
            }

            return value.Trim().Trim('"');
        }

        // Note: These commands will trigger events that the View will handle to show dialogs
        // since dialogs require UI context
        public event EventHandler? SelectSourceFolderRequested;
        public event EventHandler? SelectDestinationFolderRequested;
        public event EventHandler? SelectLogoFileRequested;
        public event EventHandler? SelectModelsFolderRequested;
        public event EventHandler? SelectCsvOutputRequested;
        public event EventHandler<string?>? SaveSettingsRequested;
        public event EventHandler<string?>? LoadSettingsRequested;
        public event EventHandler? SelectColorRequested;
        // Request that the View shows a message to the user (message, caption, icon)
        public event EventHandler<Tuple<string, string, int>>? ShowMessageRequested;
        public event EventHandler? SelectTransparentColorRequested;

        private void SelectSourceFolder(object parameter)
        {
            SelectSourceFolderRequested?.Invoke(this, EventArgs.Empty);
        }

        private void SelectDestinationFolder(object parameter)
        {
            SelectDestinationFolderRequested?.Invoke(this, EventArgs.Empty);
        }

        private void SelectLogoFile(object parameter)
        {
            SelectLogoFileRequested?.Invoke(this, EventArgs.Empty);
        }

        private void SelectModelsFolder(object parameter)
        {
            SelectModelsFolderRequested?.Invoke(this, EventArgs.Empty);
        }

        private void SelectCsvOutput(object parameter)
        {
            SelectCsvOutputRequested?.Invoke(this, EventArgs.Empty);
        }

        private void SaveSettings(object parameter)
        {
            SaveSettingsRequested?.Invoke(this, string.Empty);
        }

        private void LoadSettings(object parameter)
        {
            LoadSettingsRequested?.Invoke(this, string.Empty);
        }

        private void SelectColor(object parameter)
        {
            SelectColorRequested?.Invoke(this, EventArgs.Empty);
        }

        private void SelectTransparentColor(object parameter)
        {
            SelectTransparentColorRequested?.Invoke(this, EventArgs.Empty);
        }

        public async Task SaveSettingsToFileAsync(string filePath)
        {
            await _settingsService.SaveSettingsAsync(filePath, this);
        }

        public async Task LoadSettingsFromFileAsync(string filePath)
        {
            await _settingsService.LoadSettingsAsync(filePath, this);
        }

        private string _appVersion = string.Empty;
        public string AppVersion
        {
            get => _appVersion;
            set
            {
                _appVersion = value;
                NotifyPropertyChanged();
            }
        }
    }
}