mws.backend.dotnet/mws.application/Accounts/Commands/DeleteAccount.cs

using MediatR;
using Mws.Application.Common;
using Mws.Application.Permissions;

namespace Mws.Application.Accounts;

public record DeleteAccountCommand(Guid ActorUserId, Guid Id) : IRequest;

public class DeleteAccountHandler(IUnitOfWork uow, IPermissionService permissions) : IRequestHandler<DeleteAccountCommand>
{
    private const string Screen = "accounts";

    public async Task Handle(DeleteAccountCommand command, CancellationToken ct)
    {
        await permissions.EnsureAsync(command.ActorUserId, Screen, PermissionAction.Delete, ct);

        var user = await uow.Users.GetByIdAsync(command.Id, ct)
            ?? throw new NotFoundException("Account not found");

        var soleOwnerProjectIds = await uow.Projects.GetOwnedProjectIdsAsync(command.Id, ct);

        foreach (var projectId in soleOwnerProjectIds)
        {
            var ownerCount = await uow.Projects.CountOwnersAsync(projectId, ct);
            if (ownerCount <= 1)
            {
                throw new BadRequestException("Cannot delete an account that is the sole owner of a project");
            }
        }

        uow.Users.Remove(user);
        await uow.SaveChangesAsync(ct);
    }
}