PocketBook_MVVM/MVVM/Wrapper/BooksViewModel.cs

using ToolKit;
using Model;
using System.Collections.ObjectModel;
using System.Windows.Input;
using System.Data.Common;

namespace Wrapper
{
    public class BooksViewModel : BaseViewModel
    {
        public Manager Manager { get; set; }

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

        /*
        public ReadOnlyObservableCollection<Book> Books
        {
            get;
            private set;
        }
        private readonly List<Book> books;*/

        
        public ObservableCollection<Book> Books = new ObservableCollection<Book>();
        public ObservableCollection<GroupBooks> GroupBooks { get; private set; } = new ObservableCollection<GroupBooks>();



        public BooksViewModel(ILibraryManager libraryManager,IUserLibraryManager userLibraryManager)
        {
            Manager = new Manager(libraryManager, userLibraryManager);
            LoadBooks = new RelayCommand<string>(o => LoadBooksFromManager());

            Count = 7;
            LoadBooksFromManager();
        }

        
        private void UpdateGroupBooks()
        {
            GroupBooks.Clear();
            foreach (Book book in Books)
            {
                if (book.Authors.Count != 0)
                {
                    foreach (Author author in book.Authors)
                    {
                        Console.WriteLine(author.Name);
                        int find = -1;
                        for (int i = 0; i < GroupBooks.Count(); i++)
                        {
                            if (GroupBooks[i].Author == author.Name)
                            {
                                find = i;
                                break;
                            }
                        }
                        Console.WriteLine("l - 55");
                        if (find != -1)
                        {
                            Console.WriteLine("l - 58");
                            GroupBooks[find].Add(book);
                        }
                        else
                        {
                            Console.WriteLine("l - 63");
                            GroupBooks.Add(new GroupBooks(author.Name, new List<Book> { book }));
                        }
                    }
                }
                else
                {
                    int index = -1;
                    for ( int i = 0; i < GroupBooks.Count(); i++)
                    {
                        if (GroupBooks[i].Author == "Inconnu")
                        {
                            index = i;
                            break;
                        }
                    }
                    if (index == -1)
                    {
                        GroupBooks.Add(new GroupBooks("Inconnu", new List<Book> { book }));
                    } else
                    {
                        GroupBooks[index].Add(book);
                    }
                }
            }
            Console.WriteLine(GroupBooks.Count);
        }



        private void LoadBooksFromManager()
        {
            var result = Manager.GetBooksFromCollection(index,count,"");
            if (result.Result.books.Count() == 0 ) { return ; }
            Books.Clear();
            foreach (Book book in result.Result.books)
            {
                Books.Add(book);
            }
            NbBook = result.Result.count;

            UpdateGroupBooks();
        }

        public int Index { 
            get {  return index; }
            private set
            {
                setProperty(ref index, value);
            }
                
        }
        private int index ;



        public int Count
        {
            get { return count; }
            private set
            {
                setProperty(ref count, value);
            }

        }
        private int count;


        public long NbBook
        {
            get { return nbBook; }
            private set
            {
                setProperty(ref nbBook, value);
            }

        }
        private long nbBook;
    }
}