lagerprogramm/ViewModels/MainWindowViewModel.cs

using System;
using System.IO;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Lagerprogramm.Models;
using Lagerprogramm.Services;

namespace Lagerprogramm.ViewModels;

public partial class MainWindowViewModel : ObservableObject
{
    private readonly JsonDataService _dataService;
    private readonly AppData _appData;

    [ObservableProperty]
    private object? _currentView;

    [ObservableProperty]
    private string _currentViewName = string.Empty;

    public MainWindowViewModel()
    {
        var path = Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
            "Lagerprogramm",
            "data.json");
        _dataService = new JsonDataService(path);
        _appData = _dataService.Load();
    }

    [RelayCommand]
    private void ShowParts()
    {
        CurrentView = new PartsViewModel(_dataService, _appData);
        CurrentViewName = "Parts";
    }

    [RelayCommand]
    private void ShowAdditions()
    {
        CurrentView = new AdditionsViewModel(_dataService, _appData);
        CurrentViewName = "Additions";
    }

    [RelayCommand]
    private void ShowDeductions()
    {
        CurrentView = new DeductionsViewModel(_dataService, _appData);
        CurrentViewName = "Deductions";
    }

    [RelayCommand]
    private void ShowSettings()
    {
        CurrentView = new SettingsViewModel(_dataService, _appData);
        CurrentViewName = "Settings";
    }

    [RelayCommand]
    private void ShowDesignPreview()
    {
        CurrentView = new DesignPreviewViewModel();
        CurrentViewName = "Design Preview";
    }
}