HC_APTBS/ViewModels/Dialogs/SettingsViewModel.cs

using System;
using System.Collections.ObjectModel;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using HC_APTBS.Infrastructure.Kwp;
using HC_APTBS.Models;
using HC_APTBS.Services;

namespace HC_APTBS.ViewModels.Dialogs
{
    /// <summary>
    /// ViewModel for the application settings dialog.
    /// Loads a local copy of every <see cref="AppSettings"/> property so that
    /// Cancel discards all changes.
    /// </summary>
    public sealed partial class SettingsViewModel : ObservableObject
    {
        private readonly IConfigurationService _config;
        private readonly ILocalizationService _loc;

        // ── Dialog result ─────────────────────────────────────────────────────

        /// <summary>True when the user clicked Accept.</summary>
        public bool Accepted { get; private set; }

        /// <summary>Raised to close the owning dialog window.</summary>
        public event Action? RequestClose;

        // ── Collections ───────────────────────────────────────────────────────

        /// <summary>Available language codes for the language dropdown.</summary>
        public ObservableCollection<string> AvailableLanguages { get; } = new() { "ESP", "ENG" };

        /// <summary>RPM-voltage lookup table, editable via DataGrid.</summary>
        public ObservableCollection<RpmVoltageRelation> Relations { get; } = new();

        /// <summary>Available FTDI device serial numbers for K-Line port selection.</summary>
        public ObservableCollection<string> AvailablePorts { get; } = new();

        // ── General ───────────────────────────────────────────────────────────

        [ObservableProperty] private string _selectedLanguage = "ESP";
        [ObservableProperty] private int _daysKeepLogs = 7;

        // ── Safety ────────────────────────────────────────────────────────────

        [ObservableProperty] private int _tempMax = 45;
        [ObservableProperty] private int _tempMin = 35;
        [ObservableProperty] private int _securityRpmLimit = 2500;
        [ObservableProperty] private int _maxPressureBar = 26;
        [ObservableProperty] private double _toleranceUpExtension = 0.08;
        [ObservableProperty] private double _tolerancePfpExtension = 0.1;
        [ObservableProperty] private bool _defaultIgnoreTin = true;

        // ── PID ───────────────────────────────────────────────────────────────

        [ObservableProperty] private double _pidP = 0.1;
        [ObservableProperty] private double _pidI = 0.1;
        [ObservableProperty] private double _pidD = 0.04;
        [ObservableProperty] private int _pidLoopMs = 250;

        // ── Motor ─────────────────────────────────────────────────────────────

        [ObservableProperty] private int _encoderResolution = 4096;
        [ObservableProperty] private double _voltageForMaxRpm = 10;
        [ObservableProperty] private int _maxRpm = 2500;
        [ObservableProperty] private bool _rightRelayValue = true;

        // ── Company ───────────────────────────────────────────────────────────

        [ObservableProperty] private string _companyName = string.Empty;
        [ObservableProperty] private string _companyInfo = string.Empty;
        [ObservableProperty] private string _reportLogoPath = string.Empty;

        // ── K-Line ────────────────────────────────────────────────────────────

        [ObservableProperty] private string _selectedKLinePort = string.Empty;

        // ── Advanced (refresh intervals) ──────────────────────────────────────

        [ObservableProperty] private int _refreshBenchInterfaceMs = 20;
        [ObservableProperty] private int _refreshWhileReadingMs = 1500;
        [ObservableProperty] private int _refreshCanBusReadMs = 2;
        [ObservableProperty] private int _refreshPumpRequestMs = 250;
        [ObservableProperty] private int _refreshPumpParamsMs = 4;
        [ObservableProperty] private int _blinkIntervalMs = 1000;
        [ObservableProperty] private int _flasherIntervalMs = 800;

        // ── Constructor ───────────────────────────────────────────────────────

        /// <param name="configService">Configuration service for loading/saving settings.</param>
        /// <param name="localizationService">Localization service for language switching.</param>
        public SettingsViewModel(IConfigurationService configService, ILocalizationService localizationService)
        {
            _config = configService;
            _loc    = localizationService;

            var s = configService.Settings;

            // General
            _selectedLanguage = s.Language;
            _daysKeepLogs     = s.DaysKeepLogs;

            // Safety
            _tempMax               = s.TempMax;
            _tempMin               = s.TempMin;
            _securityRpmLimit      = s.SecurityRpmLimit;
            _maxPressureBar        = s.MaxPressureBar;
            _toleranceUpExtension  = s.ToleranceUpExtension;
            _tolerancePfpExtension = s.TolerancePfpExtension;
            _defaultIgnoreTin      = s.DefaultIgnoreTin;

            // PID
            _pidP      = s.PidP;
            _pidI      = s.PidI;
            _pidD      = s.PidD;
            _pidLoopMs = s.PidLoopMs;

            // Motor
            _encoderResolution = s.EncoderResolution;
            _voltageForMaxRpm  = s.VoltageForMaxRpm;
            _maxRpm            = s.MaxRpm;
            _rightRelayValue   = s.RightRelayValue;

            // Company
            _companyName    = s.CompanyName;
            _companyInfo    = s.CompanyInfo;
            _reportLogoPath = s.ReportLogoPath;

            // K-Line
            _selectedKLinePort = s.KLinePort;

            // Advanced
            _refreshBenchInterfaceMs = s.RefreshBenchInterfaceMs;
            _refreshWhileReadingMs   = s.RefreshWhileReadingMs;
            _refreshCanBusReadMs     = s.RefreshCanBusReadMs;
            _refreshPumpRequestMs    = s.RefreshPumpRequestMs;
            _refreshPumpParamsMs     = s.RefreshPumpParamsMs;
            _blinkIntervalMs         = s.BlinkIntervalMs;
            _flasherIntervalMs       = s.FlasherIntervalMs;

            // Deep-copy the RPM-voltage relation table
            foreach (var r in s.Relations)
                Relations.Add(new RpmVoltageRelation(r.Voltage, r.Rpm));

            // Enumerate connected FTDI devices
            EnumerateFtdiDevices();
        }

        // ── Commands ──────────────────────────────────────────────────────────

        /// <summary>Copies all local values back to AppSettings, saves, and closes.</summary>
        [RelayCommand]
        private void Accept()
        {
            var s = _config.Settings;

            // General
            s.DaysKeepLogs = DaysKeepLogs;

            // Safety
            s.TempMax               = TempMax;
            s.TempMin               = TempMin;
            s.SecurityRpmLimit      = SecurityRpmLimit;
            s.MaxPressureBar        = MaxPressureBar;
            s.ToleranceUpExtension  = ToleranceUpExtension;
            s.TolerancePfpExtension = TolerancePfpExtension;
            s.DefaultIgnoreTin      = DefaultIgnoreTin;

            // PID
            s.PidP      = PidP;
            s.PidI      = PidI;
            s.PidD      = PidD;
            s.PidLoopMs = PidLoopMs;

            // Motor
            s.EncoderResolution = EncoderResolution;
            s.VoltageForMaxRpm  = VoltageForMaxRpm;
            s.MaxRpm            = MaxRpm;
            s.RightRelayValue   = RightRelayValue;
            s.Relations         = Relations.Select(r => new RpmVoltageRelation(r.Voltage, r.Rpm)).ToList();

            // Company
            s.CompanyName    = CompanyName;
            s.CompanyInfo    = CompanyInfo;
            s.ReportLogoPath = ReportLogoPath;

            // K-Line
            s.KLinePort = SelectedKLinePort;

            // Advanced
            s.RefreshBenchInterfaceMs = RefreshBenchInterfaceMs;
            s.RefreshWhileReadingMs   = RefreshWhileReadingMs;
            s.RefreshCanBusReadMs     = RefreshCanBusReadMs;
            s.RefreshPumpRequestMs    = RefreshPumpRequestMs;
            s.RefreshPumpParamsMs     = RefreshPumpParamsMs;
            s.BlinkIntervalMs         = BlinkIntervalMs;
            s.FlasherIntervalMs       = FlasherIntervalMs;

            // Language — switch if changed (also persists via LocalizationService)
            if (SelectedLanguage != _loc.CurrentLanguage)
                _loc.SetLanguage(SelectedLanguage);

            _config.SaveSettings();

            Accepted = true;
            RequestClose?.Invoke();
        }

        /// <summary>Discards changes and closes.</summary>
        [RelayCommand]
        private void Cancel()
        {
            Accepted = false;
            RequestClose?.Invoke();
        }

        /// <summary>Opens a file dialog to select a company logo image.</summary>
        [RelayCommand]
        private void BrowseLogo()
        {
            var dlg = new Microsoft.Win32.OpenFileDialog
            {
                Title  = _loc.GetString("Dialog.Settings.BrowseLogoTitle"),
                Filter = "Image files|*.png;*.jpg;*.jpeg;*.bmp|All files|*.*"
            };

            if (!string.IsNullOrEmpty(ReportLogoPath))
            {
                try { dlg.InitialDirectory = System.IO.Path.GetDirectoryName(ReportLogoPath); }
                catch { /* ignore invalid path */ }
            }

            if (dlg.ShowDialog() == true)
                ReportLogoPath = dlg.FileName;
        }

        /// <summary>Re-enumerates connected FTDI devices into <see cref="AvailablePorts"/>.</summary>
        [RelayCommand]
        private void RefreshPorts()
        {
            EnumerateFtdiDevices();
        }

        /// <summary>Appends a new empty row to the RPM-voltage relation table.</summary>
        [RelayCommand]
        private void AddRelation()
        {
            Relations.Add(new RpmVoltageRelation(0.0, 0));
        }

        /// <summary>Removes the selected row from the RPM-voltage relation table.</summary>
        [RelayCommand]
        private void RemoveRelation(RpmVoltageRelation? relation)
        {
            if (relation != null)
                Relations.Remove(relation);
        }

        // ── Helpers ───────────────────────────────────────────────────────────

        /// <summary>
        /// Populates <see cref="AvailablePorts"/> with serial numbers of connected
        /// FTDI devices. Fails silently if the FTDI driver DLL is not present.
        /// </summary>
        private void EnumerateFtdiDevices()
        {
            AvailablePorts.Clear();
            try
            {
                uint count = FtdiInterface.GetDevicesCount();
                if (count == 0) return;

                var list = new FT_DEVICE_INFO_NODE[count];
                FtdiInterface.GetDeviceList(list);

                foreach (var device in list)
                {
                    if (!string.IsNullOrEmpty(device.SerialNumber))
                        AvailablePorts.Add(device.SerialNumber);
                }
            }
            catch
            {
                // FTDI DLL not loaded or no devices — leave list empty.
            }
        }
    }
}