Worked blocking accepted assignment

restservice/src/main/java/com/plannaplan/controllers/CommisionController.java

@@ -39,6 +39,7 @@ import org.springframework.web.bind.annotation.RequestParam;
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Iterator;
 
 import com.plannaplan.responses.mappers.AssignmentResponseMappers;
 import com.plannaplan.responses.models.AssignmentResponse;
@@ -99,16 +100,37 @@ public class CommisionController extends TokenBasedController {
                         Assert.isTrue(!notExistingGroup.isPresent(), "Group "
                                         + notExistingGroup.orElse(Long.MIN_VALUE).toString() + "doesn't exist");
 
+                        final Optional<Commision> comPrev = this.commisionService.getNewestCommision(user);
                         final Commision com = new Commision(user, asker);
                         this.commisionService.save(com);
 
+                        final List<Long> addedGroups = new ArrayList<>();
                         groups.stream().forEach((groupId) -> {
                                 Groups group = this.groupServcicxe.getGroupById(groupId)
                                                 .orElseThrow(() -> new NullPointerException());
                                 Assignment a = new Assignment(group, com);
                                 this.assignmentService.save(a);
+                                addedGroups.add(groupId);
                         });
 
+                        boolean isBad = false;
+                        if (comPrev.isPresent()) {
+                                final Iterator<Assignment> it = comPrev.get().getAssignments().iterator();
+
+                                while (it.hasNext() && !isBad) {
+                                        final Assignment a = it.next();
+                                        if (a.isAccepted() && !addedGroups.contains(a.getId())) {
+                                                isBad = true;
+                                        }
+                                }
+
+                        }
+
+                        if (isBad) {
+                                return new ResponseEntity<>("Error. You can't delete accepted assignmet",
+                                                HttpStatus.BAD_REQUEST);
+                        }
+
                         return new ResponseEntity<>("Succes", HttpStatus.OK);
                 } catch (UserNotFoundException exception) {
                         return new ResponseEntity<>(exception.getMessage(), HttpStatus.NOT_FOUND);