ulapp/FieldLogger/ViewModels/SettingsViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using FieldLogger.Models;
using FieldLogger.Services;

namespace FieldLogger.ViewModels;

public sealed partial class SettingsViewModel : ObservableObject
{
    private readonly DeviceConnectionManager _manager;
    private readonly SettingsService _settings;

    public DeviceConnectionManager Manager => _manager;

    [ObservableProperty]
    private string _mapsApiKey = "";

    public string AppVersion => AppInfo.Current.VersionString;

    public SettingsViewModel(DeviceConnectionManager manager, SettingsService settings)
    {
        _manager = manager;
        _settings = settings;
        MapsApiKey = settings.GoogleMapsApiKey;
    }

    partial void OnMapsApiKeyChanged(string value) => _settings.GoogleMapsApiKey = value.Trim();

    [RelayCommand]
    private Task ChangeLocatorAsync() => Shell.Current.GoToAsync($"devicescan?kind={DeviceKind.Locator}");

    [RelayCommand]
    private Task ChangeGpsAsync() => Shell.Current.GoToAsync($"devicescan?kind={DeviceKind.RtkGps}");

    [RelayCommand]
    private async Task ForgetLocatorAsync()
    {
        if (await ConfirmForgetAsync(_manager.LocatorName ?? "locating receiver"))
            await _manager.ForgetDeviceAsync(DeviceKind.Locator);
    }

    [RelayCommand]
    private async Task ForgetGpsAsync()
    {
        if (await ConfirmForgetAsync(_manager.GpsName ?? "RTK GPS receiver"))
            await _manager.ForgetDeviceAsync(DeviceKind.RtkGps);
    }

    private static Task<bool> ConfirmForgetAsync(string name) =>
        Shell.Current.DisplayAlert("Forget Device",
            $"Forget \"{name}\"? The app will no longer auto-connect to it.", "Forget", "Cancel");
}