fix: treat dates without price as unavailable

src/Service/AccommodationPriceCoverage.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\Entity\Groups\AccommodationPrice;
+use App\Repository\Groups\AccommodationPriceRepository;
+
+/**
+ * Determines which days of a date range are covered by an AccommodationPrice.
+ *
+ * A day without a covering price is not sold and must not be offered as available,
+ * regardless of what the external contingent calendar reports.
+ */
+final readonly class AccommodationPriceCoverage
+{
+    public function __construct(
+        private AccommodationPriceRepository $priceRepository,
+    ) {
+    }
+
+    /**
+     * @return array<string, true> keyed by Y-m-d, only covered days present
+     */
+    public function coveredDates(string $hotelCode, \DateTimeImmutable $dateFrom, \DateTimeImmutable $dateTo): array
+    {
+        return $this->coveredDatesFor(
+            $this->priceRepository->findByHotelCodeAndDateRange($hotelCode, $dateFrom, $dateTo),
+            $dateFrom,
+            $dateTo,
+        );
+    }
+
+    /**
+     * @param AccommodationPrice[] $prices
+     *
+     * @return array<string, true> keyed by Y-m-d, only covered days present
+     */
+    public function coveredDatesFor(array $prices, \DateTimeImmutable $dateFrom, \DateTimeImmutable $dateTo): array
+    {
+        $start = $dateFrom->setTime(0, 0);
+        $end = $dateTo->setTime(0, 0);
+
+        $covered = [];
+
+        // dateFrom and dateTo are both inclusive (last night, not checkout day)
+        for ($day = $start; $day <= $end; $day = $day->modify('+1 day')) {
+            foreach ($prices as $price) {
+                if ($price->getDateFrom() <= $day && $price->getDateTo() >= $day) {
+                    $covered[$day->format('Y-m-d')] = true;
+
+                    break;
+                }
+            }
+        }
+
+        return $covered;
+    }
+}