initial commit

Application/Services/UserService.cs

@@ -0,0 +1,71 @@
+using Application.Exceptions;
+using Application.Interfaces.Repositories;
+using Application.Interfaces.Services;
+using Domain.Entities;
+
+namespace Application.Services;
+
+public class UserService(IUserRepository repository) : IUserService
+{
+    private IUserRepository Repository { get; } = repository;
+
+    public IEnumerable<User> GetAllUsers()
+    {
+        return Repository.GetAllUsers();
+    }
+
+    public User GetUserById(int id)
+    {
+        if (!Repository.TryGetUserById(id, out var user))
+        {
+            throw new ArgumentException($"User with id {id} not found");
+        }
+
+        return user;
+    }
+
+    public bool CreateUser(string username, string password, string email)
+    {
+        if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(email))
+        {
+            throw new InsufficientParametersException(["username", "password", "email"]);
+        }
+
+        if (Repository.GetAllUsers().Any(x => x.Username == username))
+        {
+            throw new DuplicateUsernameException(username);
+        }
+
+        if (Repository.GetAllUsers().Any(x => x.Email == email))
+        {
+            throw new DuplicateEmailException(email);
+        }
+        
+        var user = new User
+        {
+            Id = Repository.GetAllUsers().Count() + 1,
+            Username = username,
+            Password = password,
+            Email = email
+        };
+        return Repository.AddUser(user);
+    }
+
+    public bool UpdateUser(int id, string username, string password, string email)
+    {
+        if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(email))
+        {
+            throw new InsufficientParametersException(["username", "password", "email"]);
+        }
+
+        if (!Repository.TryGetUserById(id, out var user))
+        {
+            throw new UserNotFoundException(id);
+        }
+        
+        user.Email = email;
+        user.Password = password;
+        user.Username = username;
+        return Repository.UpdateUser(user);
+    }
+}