Add StateHistory and StateEnum entities to track ticket state changes

Integrated the `StateHistory` entity to manage state transitions in tickets and the `StateEnum` for defining state values (`open`, `closed`). Updated `Ticket` to handle associations with state histories and provide state management methods. Added migration for `state_history` table and extended `TicketTest` for state-related tests.

src/Bundle/ChillTicketBundle/tests/Entity/TicketTest.php

@@ -18,6 +18,8 @@ use Chill\TicketBundle\Entity\AddresseeHistory;
 use Chill\TicketBundle\Entity\Motive;
 use Chill\TicketBundle\Entity\MotiveHistory;
 use Chill\TicketBundle\Entity\PersonHistory;
+use Chill\TicketBundle\Entity\StateEnum;
+use Chill\TicketBundle\Entity\StateHistory;
 use Chill\TicketBundle\Entity\Ticket;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 
@@ -108,4 +110,29 @@ class TicketTest extends KernelTestCase
         // Verify that getExternalRef returns the updated value
         self::assertSame($newExternalRef, $ticket->getExternalRef());
     }
+
+    public function testGetState(): void
+    {
+        $ticket = new Ticket();
+        $openState = new StateEnum(StateEnum::OPEN, ['en' => 'Open', 'fr' => 'Ouvert']);
+
+        // Initially, the ticket has no state
+        self::assertNull($ticket->getState());
+
+        // Create a state history entry with the open state
+        $history = new StateHistory($openState, $ticket);
+
+        // Verify that the ticket now has the open state
+        self::assertSame($openState, $ticket->getState());
+        self::assertCount(1, $ticket->getStateHistories());
+
+        // Change the state to closed
+        $closedState = new StateEnum(StateEnum::CLOSED, ['en' => 'Closed', 'fr' => 'Fermé']);
+        $history->setEndDate(new \DateTimeImmutable());
+        $history2 = new StateHistory($closedState, $ticket);
+
+        // Verify that the ticket now has the closed state
+        self::assertCount(2, $ticket->getStateHistories());
+        self::assertSame($closedState, $ticket->getState());
+    }
 }