Petter Karstensen

exercise.webapi/DTO/AuthorDTO.cs

@@ -0,0 +1,20 @@
+using exercise.webapi.Models;
+using System.Text.Json.Serialization;
+
+namespace exercise.webapi.DTO
+{
+    public class AuthorDTO
+    {
+        public int Id { get; set; }
+        public string FirstName { get; set; }
+        public string LastName { get; set; }
+        public string Email { get; set; }
+
+        public List<MinimalBookDTO> Books { get; set; }
+    }
+    public class MinimalBookDTO
+    {
+        public int Id { get; set; }
+        public string Title { get; set; }
+    }
+}

exercise.webapi/DTO/BookDTO.cs

@@ -0,0 +1,21 @@
+using exercise.webapi.Models;
+
+namespace exercise.webapi.DTO
+{
+    public class BookDTO
+    {
+        public int Id { get; set; }
+        public string Title { get; set; }
+
+        public int AuthorId { get; set; }
+        public MinimalAuthorDTO Author { get; set; }
+    }
+    public class MinimalAuthorDTO
+    {
+        public int Id { get; set; }
+        public string FirsName { get; set; }
+        public string LastName { get; set; }
+        public string Email { get; set; }
+
+    }
+}

exercise.webapi/DTO/PostBook.cs

@@ -0,0 +1,8 @@
+namespace exercise.webapi.DTO
+{
+    public class PostBook
+    {
+        public string Title { get; set; }
+        public int AuthorId { get; set; }
+    }
+}

exercise.webapi/DTO/PutBook.cs

@@ -0,0 +1,8 @@
+namespace exercise.webapi.DTO
+{
+    public class PutBook
+    {
+        public string? Title { get; set; }
+        public int? AuthorId { get; set; }
+    }
+}

exercise.webapi/Endpoints/AuthorApi.cs

@@ -0,0 +1,56 @@
+using exercise.webapi.DTO;
+using exercise.webapi.Models;
+using exercise.webapi.Repository;
+
+namespace exercise.webapi.Endpoints
+{
+    public static class AuthorApi
+    {
+        public static void ConfigureAuthorsApi(this WebApplication app)
+        {
+            app.MapGet("/authors", GetAuthors);
+            app.MapGet("/authors{id}", GetAuthor);
+        }
+
+        private static async Task<IResult> GetAuthors(IAuthorRepository authorRepository)
+        {
+            var authors = await authorRepository.GetAllAuthors();
+
+            var authorDTOs = authors.Select(author => new AuthorDTO
+            {
+                Id = author.Id,
+                FirstName = author.FirstName,
+                LastName = author.LastName,
+                Email = author.Email,
+                Books = author.Books.Select(book => new MinimalBookDTO
+                {
+                    Id = book.Id,
+                    Title = book.Title
+                }).ToList()
+            }).ToList();
+
+            return TypedResults.Ok(authorDTOs);
+        }
+        private static async Task<IResult> GetAuthor(IAuthorRepository authorRepository, int id)
+        {
+            var author = await authorRepository.GetAuthor(id);
+            if (author == null)
+            {
+                return TypedResults.NotFound();
+            }
+            var authorDTOs = new AuthorDTO
+            {
+                Id = author.Id,
+                FirstName = author.FirstName,
+                LastName = author.LastName,
+                Email = author.Email,
+                Books = author.Books.Select(book => new MinimalBookDTO
+                {
+                    Id = book.Id,
+                    Title = book.Title
+                }).ToList()
+            };
+            return TypedResults.Ok(authorDTOs);
+        }
+    }
+}

exercise.webapi/Endpoints/BookApi.cs

@@ -1,5 +1,7 @@
-using exercise.webapi.Models;
+using exercise.webapi.DTO;
+using exercise.webapi.Models;
 using exercise.webapi.Repository;
+using Microsoft.AspNetCore.Mvc;
 using static System.Reflection.Metadata.BlobBuilder;
 
 namespace exercise.webapi.Endpoints
@@ -8,13 +10,153 @@ public static class BookApi
     {
         public static void ConfigureBooksApi(this WebApplication app)
         {
-            app.MapGet("/books", GetBooks);
+            var books = app.MapGroup("books");
+
+            books.MapGet("/", GetBooks);
+            books.MapGet("/{id}", GetBook);
+            books.MapPost("/", AddBook);
+            books.MapPut("/{id}", UpdateBook);
+            books.MapDelete("/{id}", DeleteBook);
         }
 
         private static async Task<IResult> GetBooks(IBookRepository bookRepository)
         {
             var books = await bookRepository.GetAllBooks();
-            return TypedResults.Ok(books);
+            var bookDTO = books.Select(book => new BookDTO
+            {
+                Id = book.Id,
+                Title = book.Title,
+                AuthorId = book.AuthorId,
+                Author = new MinimalAuthorDTO
+                {
+                    Id = book.Author.Id,
+                    FirsName = book.Author.FirstName,
+                    LastName = book.Author.LastName,
+                    Email = book.Author.Email,
+                }
+            }).ToList();
+
+            return TypedResults.Ok(bookDTO);
+        }
+        private static async Task<IResult> GetBook(IBookRepository bookRepository, int id)
+        {
+            var book = await bookRepository.GetBook(id);
+            if (book == null)
+            {
+                return TypedResults.NotFound();
+            }
+            var bookDTOs = new BookDTO
+            {
+                Id = book.Id,
+                Title = book.Title,
+                Author = new MinimalAuthorDTO
+                {
+                    Id = book.Author.Id,
+                    FirsName= book.Author.FirstName,
+                    LastName = book.Author.LastName,
+                    Email = book.Author.Email,
+                }
+            };
+            return TypedResults.Ok(bookDTOs);
+        }
+        [ProducesResponseType(StatusCodes.Status201Created)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
+        public static async Task<IResult> AddBook(IBookRepository bookRepository, IAuthorRepository authorRepository, PostBook model)
+        {
+            try
+            {
+
+                var author = await authorRepository.GetAuthor(model.AuthorId);
+                if (author == null)
+                {
+                    return TypedResults.NotFound("Author not found");
+                }
+                if (string.IsNullOrEmpty(model.Title))
+                {
+                    return TypedResults.BadRequest("Title is empty");
+                }
+                Book book = new Book()
+                {
+                    Title = model.Title,
+                    AuthorId = model.AuthorId
+                };
+                await bookRepository.AddBook(book);
+
+                var bookDTOs = new BookDTO
+                {
+                    Id = book.Id,
+                    Title = book.Title,
+                    AuthorId = book.AuthorId,
+                    Author = new MinimalAuthorDTO
+                    {
+                        Id = book.Author.Id,
+                        FirsName = book.Author.FirstName,
+                        LastName = book.Author.LastName,
+                        Email = book.Author.Email,
+                    }
+                };
+
+                return TypedResults.Created($"https://localhost:7010/products/{book.Id}", bookDTOs);
+            }
+            catch (Exception ex)
+            {
+                return TypedResults.Problem(ex.Message);
+            }
+        }
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
+        public static async Task<IResult> UpdateBook(IBookRepository bookRepository, IAuthorRepository authorRepository, int id, PutBook model)
+        {
+            try
+            {
+                var target = await bookRepository.GetBook(id);
+                if (target == null) return Results.NotFound("Book not found");
+
+                Author authorTarget = null; 
+
+                if (model.AuthorId != null)
+                {
+                    authorTarget = await authorRepository.GetAuthor((int)model.AuthorId);
+                    target.AuthorId = (int)model.AuthorId;
+                    target.Author = authorTarget;
+                }
+
+                if (!string.IsNullOrEmpty(model.Title)) target.Title = model.Title;
+
+                await bookRepository.UpdateBook(target);
+
+                var bookDTOs = new BookDTO
+                {
+                    Id = target.Id,
+                    Title = target.Title,
+                    AuthorId = target.AuthorId,
+                    Author = new MinimalAuthorDTO
+                    {
+                        Id = target.Author.Id,
+                        FirsName = target.Author.FirstName,
+                        LastName = target.Author.LastName,
+                        Email = target.Author.Email,
+                    }
+                };
+                return TypedResults.Ok(bookDTOs);
+            }
+            catch (Exception ex)
+            {
+                return TypedResults.Problem(ex.Message);
+            }
+        }
+        public static async Task<IResult> DeleteBook(IBookRepository bookRepository, int id)
+        {
+            try
+            {
+                var target = await bookRepository.GetBook(id);
+                if (await bookRepository.DeleteBook(id)) return Results.Ok($"Book: {target.Title} Deleted");
+                return TypedResults.NotFound("Book not found");
+            }
+            catch (Exception ex)
+            {
+                return TypedResults.Problem(ex.Message);
+            }
         }
     }
 }

exercise.webapi/Models/Author.cs

@@ -9,7 +9,7 @@ public class Author
         public string LastName { get; set; }
         public string Email { get; set; }
 
-        [JsonIgnore] // Todo: replace this with DTO approach
+        //[JsonIgnore] // Todo: replace this with DTO approach
         public ICollection<Book> Books { get; set; } = new List<Book>();
     }
 }

exercise.webapi/Models/Book.cs

@@ -1,4 +1,5 @@
-using System.ComponentModel.DataAnnotations.Schema;
+using exercise.webapi.DTO;
+using System.ComponentModel.DataAnnotations.Schema;
 
 namespace exercise.webapi.Models
 {

exercise.webapi/Program.cs

@@ -11,6 +11,7 @@
 builder.Services.AddSwaggerGen();
 builder.Services.AddDbContext<DataContext>(opt => opt.UseInMemoryDatabase("Library"));
 builder.Services.AddScoped<IBookRepository, BookRepository>();
+builder.Services.AddScoped<IAuthorRepository, AuthorRepository>();
 
 var app = builder.Build();
 
@@ -29,4 +30,5 @@
 
 app.UseHttpsRedirection();
 app.ConfigureBooksApi();
+app.ConfigureAuthorsApi();
 app.Run();

exercise.webapi/Repository/AuthorRepository.cs

@@ -0,0 +1,26 @@
+using exercise.webapi.Data;
+using exercise.webapi.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace exercise.webapi.Repository
+{
+    public class AuthorRepository : IAuthorRepository
+    {
+        DataContext _db;
+
+        public AuthorRepository(DataContext db)
+        {
+            _db = db;
+        }
+
+        public async Task<IEnumerable<Author>> GetAllAuthors()
+        {
+            return await _db.Authors.Include(a => a.Books).ToListAsync();
+
+        }
+        public async Task<Author> GetAuthor(int id)
+        {
+            return await _db.Authors.Include(a => a.Books).FirstOrDefaultAsync(a => a.Id == id);
+        }
+    }
+}

exercise.webapi/Repository/BookRepository.cs

@@ -16,7 +16,30 @@ public BookRepository(DataContext db)
         public async Task<IEnumerable<Book>> GetAllBooks()
         {
             return await _db.Books.Include(b => b.Author).ToListAsync();
-
+        }
+        public async Task<Book> GetBook(int id)
+        {
+            return await _db.Books.Include(b => b.Author).FirstOrDefaultAsync(b => b.Id == id);
+        }
+        public async Task<Book> AddBook(Book book)
+        {
+            await _db.Books.AddAsync(book);
+            await _db.SaveChangesAsync();
+            return book;
+        }
+        public async Task<Book> UpdateBook(Book book)
+        {
+            var target = await _db.Books.FindAsync(book.Id);
+            _db.Entry(target).CurrentValues.SetValues(book);
+            await _db.SaveChangesAsync();
+            return book;
+        }
+        public async Task<bool> DeleteBook(int id)
+        {
+            var target = await _db.Books.FindAsync(id);
+            _db.Books.Remove(target);
+            await _db.SaveChangesAsync();
+            return true;
         }
     }
 }

exercise.webapi/Repository/IAuthorRepository.cs

@@ -0,0 +1,10 @@
+using exercise.webapi.Models;
+
+namespace exercise.webapi.Repository
+{
+    public interface IAuthorRepository
+    {
+        public Task<IEnumerable<Author>> GetAllAuthors();
+        public Task<Author> GetAuthor(int id);
+    }
+}

exercise.webapi/Repository/IBookRepository.cs

@@ -5,5 +5,9 @@ namespace exercise.webapi.Repository
     public interface IBookRepository
     {
         public Task<IEnumerable<Book>> GetAllBooks();
+        public Task<Book> GetBook(int id);
+        public Task<Book> AddBook(Book book);
+        public Task<Book> UpdateBook(Book book);
+        public Task<bool> DeleteBook(int id);
     }
 }