HC_APTBS/ViewModels/Pages/SettingsPageViewModel.cs

using System;
using System.Collections.ObjectModel;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System.Windows;
using HC_APTBS.Infrastructure.Kwp;
using HC_APTBS.Infrastructure.Logging;
using HC_APTBS.Models;
using HC_APTBS.Services;
using HC_APTBS.ViewModels.Dialogs;
using HC_APTBS.Views.Dialogs;

namespace HC_APTBS.ViewModels.Pages
{
    /// <summary>
    /// ViewModel for the Settings navigation page.
    /// Loads a local copy of every <see cref="AppSettings"/> property so that
    /// Discard reverts all pending changes without touching persisted state.
    /// </summary>
    public sealed partial class SettingsPageViewModel : ObservableObject
    {
        private readonly IConfigurationService _config;
        private readonly ILocalizationService _loc;
        private readonly IAppLogger _log;

        /// <summary>
        /// Raised after <see cref="SaveCommand"/> successfully persists settings.
        /// The shell subscribes to reseed timers or other settings-dependent state.
        /// </summary>
        public event Action? SettingsSaved;

        // ── 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;

        /// <summary>
        /// When true, the Dashboard "Connect &amp; Auto Test" flow bypasses the oil-pump
        /// leak-check dialog. Operator opts in once; does not affect manual controls.
        /// </summary>
        [ObservableProperty] private bool _autoTestSkipsOilPumpConfirm;

        // ── 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;
        [ObservableProperty] private int _rpmChartUpdateHz = 15;

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

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

            LoadFromConfig();
            EnumerateFtdiDevices();
        }

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

        /// <summary>Copies all local values back to AppSettings, saves to disk, applies language if changed.</summary>
        [RelayCommand]
        private void Save()
        {
            _log.Info("SETTINGSVM", $"Save invoked. SelectedLanguage='{SelectedLanguage}', loc.CurrentLanguage='{_loc.CurrentLanguage}'");
            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;
            s.AutoTestSkipsOilPumpConfirm = AutoTestSkipsOilPumpConfirm;

            // 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;
            s.RpmChartUpdateHz        = RpmChartUpdateHz;

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

            _config.SaveSettings();

            SettingsSaved?.Invoke();
        }

        /// <summary>Reverts all local fields to the currently persisted <see cref="AppSettings"/> values.</summary>
        [RelayCommand]
        private void Discard()
        {
            LoadFromConfig();
        }

        /// <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);
        }

        /// <summary>
        /// Opens the user management dialog after a successful admin authentication.
        /// The auth dialog is re-prompted on every invocation — there is no session cache.
        /// </summary>
        [RelayCommand]
        private void ManageUsers()
        {
            var owner = GetOwnerWindow();

            // Step 1: admin authentication.
            var authVm  = new UserCheckViewModel(_config, _loc);
            var authDlg = new UserCheckDialog(authVm) { Owner = owner };
            authDlg.ShowDialog();
            if (!authVm.Accepted) return;

            // Step 2: management dialog.
            var manageVm  = new UserManageViewModel(_config, _loc);
            var manageDlg = new UserManageDialog(manageVm) { Owner = owner };
            manageDlg.ShowDialog();
        }

        /// <summary>Finds a plausible dialog owner (active window, else main window).</summary>
        private static Window? GetOwnerWindow()
        {
            foreach (Window w in Application.Current.Windows)
            {
                if (w.IsActive) return w;
            }
            return Application.Current.MainWindow;
        }

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

        /// <summary>Copies every persisted setting into the local mirror fields.</summary>
        private void LoadFromConfig()
        {
            var s = _config.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;
            AutoTestSkipsOilPumpConfirm = s.AutoTestSkipsOilPumpConfirm;

            // 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;
            RpmChartUpdateHz        = s.RpmChartUpdateHz;

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

        /// <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.
            }
        }
    }
}