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Application/Users/Handlers/CreateUserCommandHandler.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Musify.Application.Contracts.Infrastructure;
+using Musify.Application.Users.Commands;
+using Musify.Application.Users.Responses;
+using Musify.Domain.Entities;
+
+namespace Musify.Application.Users.Handlers
+{
+    public class CreateUserCommandHandler(IDatabase database, IKeycloakUserService keycloakUserClient, ILogger<CreateUserCommandHandler> logger)
+        : IRequestHandler<CreateUserCommand, Task<Result<UserResponse> >>
+    {
+        public async Task<Result<UserResponse>> Handle(CreateUserCommand request, CancellationToken cancellationToken)
+        {
+            logger.LogDebug("Handling {CommandName} with Id: {UserId}", nameof(CreateUserCommand), request.Id);
+
+            var existingUser = await database.Users.SingleOrDefaultAsync(u => u.Id == request.Id, cancellationToken);
+
+            if (existingUser is not null)
+            {
+                logger.LogInformation("User with Id={UserId} already exists.", request.Id);
+                return Result<UserResponse>.Conflict($"A user with Id {request.Id} already exists.");
+            }
+
+            var keycloakUser = await keycloakUserClient.GetUserByIdAsync(request.Id.ToString(), cancellationToken);
+
+            if (!keycloakUser.IsSuccess)
+            {
+                logger.LogWarning("Keycloak user with Id={UserId} was not found.", request.Id);
+                return Result.NotFound("Keycloak user not found.");
+            }
+
+            var newUser = new User
+            {
+                Id = request.Id
+            };
+
+            await database.Users.AddAsync(newUser, cancellationToken);
+            await database.SaveChangesAsync(cancellationToken);
+
+            logger.LogInformation("User with Id={UserId} created successfully.", newUser.Id);
+            return Result.Created(new UserResponse(
+                newUser.Id.ToString(),
+                keycloakUser.Value.Name,
+                keycloakUser.Value.FirstName,
+                keycloakUser.Value.SecondName,
+                newUser.CreatedAt,
+                newUser.UpdatedAt));
+        }
+    }
+}