forkmessager/backend/src/Modules/Identity/Application/Users/Avatar/DeleteAvatar.cs

using Knot.Shared.Kernel;
using Knot.Modules.Identity.Domain;
using Knot.Modules.Identity.Application.Abstractions;

namespace Knot.Modules.Identity.Application.Users.Avatar;

public sealed record DeleteAvatarCommand(Guid UserId) : ICommand<UserProfileDto>;

internal sealed class DeleteAvatarCommandHandler : ICommandHandler<DeleteAvatarCommand, UserProfileDto>
{
    private readonly IUserRepository _userRepository;
    private readonly IIdentityUnitOfWork _unitOfWork;

    public DeleteAvatarCommandHandler(IUserRepository userRepository, IIdentityUnitOfWork unitOfWork)
    {
        _userRepository = userRepository;
        _unitOfWork = unitOfWork;
    }

    public async Task<Result<UserProfileDto>> Handle(DeleteAvatarCommand request, CancellationToken cancellationToken)
    {
        var user = await _userRepository.GetByIdAsync(request.UserId, cancellationToken);
        if (user == null)
        {
            return Result.Failure<UserProfileDto>(IdentityErrors.UserNotFound);
        }

        user.UpdateAvatar(null);
        await _unitOfWork.SaveChangesAsync(cancellationToken);

        var dto = new UserProfileDto(
            user.Id,
            user.Username,
            user.DisplayName,
            user.Avatar,
            user.Bio,
            user.Birthday,
            user.CreatedAt
        );

        return Result.Success(dto);
    }
}