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Application/Users/Handlers/GetUserByIdQueryHandler.cs

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+using Ardalis.Result;
+using DispatchR.Abstractions.Send;
+using Microsoft.EntityFrameworkCore;
+using Musify.Application.Contracts.Infrastructure;
+using Musify.Application.Users.Queries;
+using Musify.Application.Users.Responses;
+
+namespace Musify.Application.Users.Handlers
+{
+    public class GetUserByIdQueryHandler(IDatabase database, IKeycloakUserService keycloakUserClient)
+        : IRequestHandler<GetUserByIdQuery, Task<Result<UserResponse> >>
+    {
+        public async Task<Result<UserResponse>> Handle(GetUserByIdQuery request, CancellationToken cancellationToken)
+        {
+            var user = await database.Users
+                .AsNoTracking()
+                .SingleOrDefaultAsync(u => u.Id == request.Id, cancellationToken);
+
+            if (user is null)
+                return Result.NotFound("User not found.");
+
+            var keycloakUser = await keycloakUserClient.GetUserByIdAsync(user.Id.ToString(), cancellationToken);
+
+            if (!keycloakUser.IsSuccess)
+                return Result.NotFound("Keycloak user not found.");
+
+            return Result.Success(new UserResponse(
+                user.Id.ToString(),
+                keycloakUser.Value.Name,
+                keycloakUser.Value.FirstName,
+                keycloakUser.Value.SecondName,
+                user.CreatedAt,
+                user.UpdatedAt));
+        }
+    }
+}