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Services/BookService.cs

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+using System;
+using example_csharp_app.Dto;
+using example_csharp_app.Interfaces;
+using example_csharp_app.Models.Mapper;
+using example_csharp_app.Models.Model;
+using example_csharp_app.Models.Request;
+
+namespace example_csharp_app.Services;
+
+public class BookService : IBookService
+{  
+    private readonly IBookRepository _bookRepository;
+
+    public BookService(IBookRepository bookRepository)
+    {
+        _bookRepository = bookRepository;
+    }
+
+    public async Task<int> AddBookAsync(BookCreateModel model)
+    {
+        var dto = model.MapToDto();
+        var result = await _bookRepository.AddBookAsync(dto);
+        return result;
+    }
+
+    public async Task<BookModel?> GetBookAsync(Guid bookId)
+    {
+        var result = await _bookRepository.GetBookAsync(bookId, enableEdit: false);
+        return result?.MapToModel();
+    }
+
+    public async Task<IReadOnlyCollection<BookModel>> GetBooksAsync(BookFilterRequest request)
+    {
+        var result = await _bookRepository.GetBookListAsync(request);
+        return result.Select(x => x.MapToModel()).ToList();
+    }
+
+    public async Task<int> RemoveBookAsync(Guid bookId)
+    {
+        var book = await GetBookForEdit(bookId);
+        return await _bookRepository.RemoveBookAsync(book);
+    }
+
+    public async Task<int> UpdateBookAsync(Guid bookId, BookUpdateModel model)
+    {
+        var book = await GetBookForEdit(bookId);
+        
+        book.Author = model.Author;
+        book.BookIndex = model.BookIndex;
+        book.Title = model.Title;
+        book.YearPublished = model.YearPublished;
+
+        return await _bookRepository.UpdateBookAsync(book);
+    }
+
+    private async Task<BookDto> GetBookForEdit(Guid bookId)
+    {
+        var book = await _bookRepository.GetBookAsync(bookId);
+        return book ?? throw new ArgumentException();
+    }
+}