ref: project structure

application/Permissions/Commands/DeleteRole.cs

@@ -0,0 +1,28 @@
+using MediatR;
+using mws.backend.dotnet.application.Common;
+
+namespace mws.backend.dotnet.application.Permissions;
+
+public record DeleteRoleCommand(Guid Id) : IRequest;
+
+public class DeleteRoleHandler(IUnitOfWork uow) : IRequestHandler<DeleteRoleCommand>
+{
+    public async Task Handle(DeleteRoleCommand command, CancellationToken ct)
+    {
+        var role = await uow.Roles.GetByIdAsync(command.Id, ct)
+            ?? throw new NotFoundException("Role not found");
+
+        if (role.IsSystem)
+        {
+            throw new BadRequestException("Cannot delete a system role");
+        }
+
+        if (await uow.Users.ExistsByRoleIdAsync(command.Id, ct))
+        {
+            throw new BadRequestException("Cannot delete a role that is assigned to accounts");
+        }
+
+        uow.Roles.Remove(role);
+        await uow.SaveChangesAsync(ct);
+    }
+}