Add user service and controller

src/GameIdeas/Server/GameIdeas.WebAPI/Services/Users/UserWriteService.cs

@@ -0,0 +1,83 @@
+using AutoMapper;
+using GameIdeas.Resources;
+using GameIdeas.Shared.Dto;
+using GameIdeas.Shared.Model;
+using GameIdeas.WebAPI.Exceptions;
+using Microsoft.AspNetCore.Identity;
+
+namespace GameIdeas.WebAPI.Services.Users;
+
+public class UserWriteService(
+    UserManager<User> userManager) : IUserWriteService
+{
+    public async Task<string> CreateUser(UserDto user)
+    {
+        if (user.Username == null || 
+            user.Password == null || 
+            user.Role == null)
+        {
+            throw new UserInvalidException(ResourcesKey.MissingField);
+        }
+
+        User userToCreate = new() { UserName = user.Username };
+
+        var result = await userManager.CreateAsync(userToCreate, user.Password);
+
+        if (result.Succeeded)
+        {
+            await userManager.AddToRoleAsync(userToCreate, user.Role.Name);
+        }
+        else
+        {
+            throw new UserInvalidException(string.Join("; ", result.Errors));
+        }
+
+        return userToCreate.Id;
+    }
+
+    public async Task<string> DeleteUser(string userId)
+    {
+        if (userId == null)
+        {
+            throw new ArgumentNullException(ResourcesKey.MissingField);
+        }
+
+        var user = await userManager.FindByIdAsync(userId)
+            ?? throw new UserInvalidException("User not found");
+
+        await userManager.DeleteAsync(user);
+        return userId;
+    }
+
+    public async Task<string> UpdateUser(string userId, UserDto user)
+    {
+        if (userId == null)
+        {
+            throw new ArgumentNullException(ResourcesKey.MissingField);
+        }
+
+        var userToUpdate = await userManager.FindByIdAsync(userId)
+            ?? throw new UserInvalidException("User not found");
+
+        if (user.Username != null)
+        {
+            userToUpdate.UserName = user.Username;
+            await userManager.UpdateAsync(userToUpdate);
+        }
+
+        if (user.Password != null)
+        {
+            await userManager.RemovePasswordAsync(userToUpdate);
+            await userManager.AddPasswordAsync(userToUpdate, user.Password);
+        }
+
+        if (user.Role != null)
+        {
+            var roles = await userManager.GetRolesAsync(userToUpdate);
+            await userManager.RemoveFromRolesAsync(userToUpdate, roles);
+            await userManager.AddToRoleAsync(userToUpdate, user.Role.Name);  
+        }
+
+        return userToUpdate.Id;
+    }
+}