PocketBook/Sources/Model/ILibraryManager.cs

using System;

namespace Model
{
    public interface ILibraryManager
    {
        Task<Book> GetBookById(string id);
        Task<Book> GetBookByISBN(string isbn);
        Task<Tuple<long, IEnumerable<Book>>> GetBooksByTitle(
            string title,
            int index,
            int count,
            string sort = ""
        );
        Task<Tuple<long, IEnumerable<Book>>> GetBooksByAuthorId(
            string authorId,
            int index,
            int count,
            string sort = ""
        );
        Task<Tuple<long, IEnumerable<Book>>> GetBooksByAuthor(
            string author,
            int index,
            int count,
            string sort = ""
        );
        Task<Author> GetAuthorById(string id);
        Task<Tuple<long, IEnumerable<Author>>> GetAuthorsByName(
            string substring,
            int index,
            int count,
            string sort = ""
        );
    }
}