Musify/Application/Users/Queries/GetUserById/GetUserByIdQueryHandler.cs

using Ardalis.Result;
using DispatchR.Abstractions.Send;
using Microsoft.EntityFrameworkCore;
using Musify.Application.Contracts.Infrastructure;
using Musify.Application.Users.Contracts;

namespace Musify.Application.Users.Queries.GetUserById
{
    public class GetUserByIdQueryHandler(IDatabase database, IKeycloakUserClient 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));
        }
    }
}