ANTOOZA-BACKEND/Application/Features/Director/User/GetRoles/Handler.cs

using Application.Abstractions.Messaging;
using Application.Abstractions.Identity;
using SharedKernel.Results;

namespace Application.Features.Director.User.GetRoles;

public sealed class Handler(IIdentityRoleReader roleReader, IIdentityUserReader userReader) : IQueryHandler<Query, Result<Response>>
{
    public async Task<Result<Response>> Handle(Query request, CancellationToken ct)
    {
        var user = await userReader.GetUserAsync(request.UserID, ct);
        if (user == null)
        {
            return Result.Failure<Response>(Error.NotFound("User.NotFound", "회원 정보를 찾을 수 없습니다."));
        }

        var roles = await roleReader.GetRolesAsync(ct);
        var userRoleSet = new HashSet<string>(user.Roles, StringComparer.OrdinalIgnoreCase);

        return Result.Success(new Response
        {
            User = user,
            Roles = [..roles.Select(role => new Response.Checkbox
            {
                DisplayValue = role.Name,
                IsSelected = role.Name != null && userRoleSet.Contains(role.Name)
            })]
        });
    }
}