PocketBook/sources/ViewModel/ManagerVM.cs

namespace ViewModel;

using System.Collections.ObjectModel;
using Model;
using MyToolkitMVVM;

public class ManagerVM : BaseViewModel<Manager>
{
    public ReadOnlyObservableCollection<BookVM> Books { get; set; }

    private readonly ObservableCollection<BookVM> books = new ObservableCollection<BookVM>();

    public RelayCommand<string> LoadBooks { get; private set; }

    public IEnumerable<IGrouping<string, BookVM>> GroupedBooks => Books.GroupBy(b => b.BookFirstAuthor).OrderBy(group => group.Key);

    public BookVM SelectedBook
    {
        get => selectedBook;
        set => SetProperty(ref selectedBook, value);
    }

    private BookVM selectedBook;

    public ManagerVM(ILibraryManager libraryManager,IUserLibraryManager userLibraryManager)
    :this(new Manager(libraryManager,userLibraryManager))
    {}

    public async void LoadBooksFromManager()
    {
        var result = await Model.GetBooksFromCollection(index, 40, "");
        NbBook = (int)result.count;
        books.Clear();

        foreach (Book book in result.books)
        {
            books.Add(new BookVM(book));
        }
    }

    public async void LoadBookFromManager(string id)
    {
        var result = await Model.GetBookById(id);
        SelectedBook = new BookVM(result);
    }

    public ManagerVM(Manager model) : base(model)
    {
        LoadBooks = new RelayCommand<string>(o => LoadBooksFromManager());
        LoadBooks.Execute();
        Books = new ReadOnlyObservableCollection<BookVM>(books);
    }

    public int Index
    {
        get => index;
        set => SetProperty(ref index, value);

    }
    private int index;

    public int Count
    {
        get => count;
        set => SetProperty(ref count, value);

    }
    private int count;


    public int NbBook
    {
        get => nbBook;
        set => SetProperty(ref nbBook, value);
    }

    private int nbBook;

}