GazpromApp/ViewModels/EditEquipmentDialogViewModel.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Web;
using Avalonia.Controls;
using Avalonia.Media.Imaging;
using Avalonia.Platform.Storage;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using GazpromApp.Enums;
using GazpromApp.Messages;
using GazpromApp.Models;

namespace GazpromApp.ViewModels;

public partial class EditEquipmentDialogViewModel : ViewModelBase
{
    [ObservableProperty] 
    [NotifyCanExecuteChangedFor(nameof(CompleteEditCommand))]
    private string? _name;
    
    [ObservableProperty]
    [NotifyCanExecuteChangedFor(nameof(CompleteEditCommand))]
    private string? _description;
    
    [ObservableProperty]
    private bool _isNameEditing;
    
    [ObservableProperty]
    private bool _isDescriptionEditing;
    
    [ObservableProperty]
    private ImageViewModel? _image;
    
    [RelayCommand]
    private void EditName()
    {
        IsNameEditing = !IsNameEditing;
        IsDescriptionEditing = false;
    }
    
    [RelayCommand]
    private void EditDescription()
    {
        IsDescriptionEditing = !IsDescriptionEditing;
        IsNameEditing = false;
    }
    
    [RelayCommand]
    private async Task AddImage(Window w)
    {
        IReadOnlyList<IStorageFile> files = await w.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions()
        {
            AllowMultiple = false,
            Title = "Выберите картинку",
            FileTypeFilter = [FilePickerFileTypes.ImageAll],
        });
        
        IsImageSelected = files.Count > 0;
        
        try
        {
            Image = IsImageSelected ? new ImageViewModel(new Models.Image()) { FileName = new Bitmap(HttpUtility.UrlDecode(files[0].Path.AbsolutePath)) } : null;   
        }
        catch (ArgumentException)
        {
            Error error = new Error()
            {
                Title = "Ошибка обработки картинки",
                Message = "Картинка не была добавлена",
                Severity = ErrorSeverity.Error,
            };
            _ = await WeakReferenceMessenger.Default.Send(new ErrorMessage(new ErrorViewModel(error)));
            
            IsImageSelected = false;
        }
    }
    
    [RelayCommand]
    private async Task ViewImage()
    {
        if (Image is null) return;
        _ = await WeakReferenceMessenger.Default.Send(new ViewImageMessage(Image));
    }
    
    [RelayCommand]
    private void DeleteImage()
    {
        Image = null;
        IsImageSelected = false;
    }
    
    private bool CanCompleteEdit() => !string.IsNullOrWhiteSpace(Name);

    [RelayCommand(CanExecute = nameof(CanCompleteEdit))]
    private void CompleteEdit()
    {
        IsClosed = true;
        Equipment equipment = new Equipment()
        {
            Name = Name,
            Description = Description,
            Image = Image?.GetImage(),
            Properties = [],
        };
        WeakReferenceMessenger.Default.Send(new EditEquipmentDone(new EquipmentViewModel(equipment)));
    }

    [RelayCommand]
    private void CancelEdit(Window w)
    {
        IsClosed = true;
        WeakReferenceMessenger.Default.Send(new EditEquipmentDone(_equipment));
    }
    
    // Visual and other properties
    
    [ObservableProperty]
    private bool _isImageSelected;

    [ObservableProperty]
    private bool _isClosed;
    
    private readonly EquipmentViewModel _equipment;

    public EditEquipmentDialogViewModel()
    {
        Name = "";
        Description = "";
        Image = null;
        
        IsImageSelected = false;
        
        _equipment = new EquipmentViewModel(new  Equipment());
    }

    public EditEquipmentDialogViewModel(EquipmentViewModel equipment)
    {
        Name = equipment.Name;
        Description = equipment.Description;
        Image = equipment.Image;
        
        IsImageSelected = equipment.Image is { Bytes.Length: > 0 };
        
        _equipment = equipment;
    }
}