some data in msgraph synchro and answer on calendar invite

src/Bundle/ChillCalendarBundle/Entity/Calendar.php

@@ -26,6 +26,7 @@ use DateInterval;
 use DateTimeImmutable;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\Criteria;
 use Doctrine\ORM\Mapping as ORM;
 use LogicException;
 use Symfony\Component\Serializer\Annotation as Serializer;
@@ -212,7 +213,7 @@ class Calendar implements TrackCreationInterface, TrackUpdateInterface
 
     public function addUser(User $user): self
     {
-        if (!$this->getUsers()->contains($user)) {
+        if (!$this->getUsers()->contains($user) && $this->getMainUser() !== $user) {
             $this->addInvite((new Invite())->setUser($user));
         }
 
@@ -263,6 +264,21 @@ class Calendar implements TrackCreationInterface, TrackUpdateInterface
         return $this->id;
     }
 
+    public function getInviteForUser(User $user): ?Invite
+    {
+        $criteria = Criteria::create();
+        $criteria->where(Criteria::expr()->eq('user', $user));
+
+        $matchings = $this->invites
+            ->matching($criteria);
+
+        if (1 === $matchings->count()) {
+            return $matchings->first();
+        }
+
+        return null;
+    }
+
     /**
      * @return Collection|Invite[]
      */
@@ -365,6 +381,18 @@ class Calendar implements TrackCreationInterface, TrackUpdateInterface
         return null !== $this->calendarRange;
     }
 
+    /**
+     * return true if the user is invited.
+     */
+    public function isInvited(User $user): bool
+    {
+        if ($this->getMainUser() === $user) {
+            return false;
+        }
+
+        return $this->getUsers()->contains($user);
+    }
+
     public static function loadValidatorMetadata(ClassMetadata $metadata): void
     {
         $metadata->addPropertyConstraint('startDate', new NotBlank());
@@ -485,6 +513,7 @@ class Calendar implements TrackCreationInterface, TrackUpdateInterface
         }
 
         $this->mainUser = $mainUser;
+        $this->removeUser($mainUser);
 
         return $this;
     }