feat: implement mutability cutoff for rentals

addresses #869cca42x

src/Form/Service/Condition/TravelStartCutoffReachedCondition.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Condition;
+
+use App\Form\Model\BookingDto;
+use App\Form\Service\Contract\FieldConditionInterface;
+use Carbon\CarbonImmutable;
+
+/**
+ * Condition that becomes true once a configurable day-based cutoff is reached.
+ *
+ * Cutoff semantics are inclusive and day-based:
+ * now(startOfDay) >= travelStart(startOfDay) - N days.
+ */
+class TravelStartCutoffReachedCondition implements FieldConditionInterface
+{
+    public const int DEFAULT_DAYS_BEFORE_START = 4;
+
+    /**
+     * @param int $daysBeforeStart Number of days before travel start when the cutoff is reached
+     */
+    public function __construct(
+        private readonly int $daysBeforeStart,
+    ) {
+        if ($daysBeforeStart < 0) {
+            throw new \InvalidArgumentException('daysBeforeStart must be greater than or equal to 0.');
+        }
+    }
+
+    public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
+    {
+        if (null === $bookingDto->travel->dateFrom) {
+            return false;
+        }
+
+        $travelStartDate = CarbonImmutable::instance($bookingDto->travel->dateFrom)->startOfDay();
+        $cutoffDate = $travelStartDate->subDays($this->daysBeforeStart);
+        $today = CarbonImmutable::now()->startOfDay();
+
+        return $today->greaterThanOrEqualTo($cutoffDate);
+    }
+
+    public function getDependentFields(): array
+    {
+        return [];
+    }
+
+    public function getDescription(): string
+    {
+        return sprintf(
+            'Cutoff reached from %d day(s) before travel start (inclusive)',
+            $this->daysBeforeStart
+        );
+    }
+}