feat: turn search_trips into the website's travel search

src/Enum/RoomType.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enum;
+
+/**
+ * Room type as the website's travel search filters it ("Zimmerarten").
+ *
+ * Taken from the room's capacity, as TYPO3's RoomTypeResolver does since the room-code
+ * mapping was retired: `maxPax` 1-8 maps directly, 9 and up is "9er+". A bed shared with
+ * other customers is sold per bed (`maxPax` 1), so it is recognised by its label instead;
+ * without that, a bed in a dorm would count as an Einzelzimmer.
+ */
+enum RoomType: string
+{
+    case ForOne = 'EZ';
+    case ForTwo = 'DZ';
+    case ForThree = '3er';
+    case ForFour = '4er';
+    case ForFive = '5er';
+    case ForSix = '6er';
+    case ForSeven = '7er';
+    case ForEight = '8er';
+    case ForNinePlus = '9er+';
+    case WithOthers = 'mit anderen';
+
+    /** The "Babypreis 0-2 Jährige" row: priced like a room, but not one. */
+    public const BABY_CODE = 'Baby';
+
+    /** Label phrases (lower case) that mark a bed shared with other customers. */
+    private const WITH_OTHERS_MARKERS = ['bett im', 'mit ander'];
+
+    /**
+     * Null for the baby row, which is not a room.
+     */
+    public static function classify(?string $code, ?string $label, ?int $maxPax, ?int $minPax): ?self
+    {
+        if (self::BABY_CODE === trim((string) $code)) {
+            return null;
+        }
+
+        $label = mb_strtolower((string) $label);
+        foreach (self::WITH_OTHERS_MARKERS as $marker) {
+            if (str_contains($label, $marker)) {
+                return self::WithOthers;
+            }
+        }
+
+        $pax = ($maxPax ?? 0) > 0 ? (int) $maxPax : (int) $minPax;
+
+        return match (true) {
+            $pax >= 9 => self::ForNinePlus,
+            $pax >= 1 => [1 => self::ForOne, self::ForTwo, self::ForThree, self::ForFour, self::ForFive, self::ForSix, self::ForSeven, self::ForEight][$pax],
+            // No usable occupancy: TYPO3 files it under "mit anderen" as well.
+            default => self::WithOthers,
+        };
+    }
+}