feat: turn search_trips into the website's travel search

src/Chatbot/TravelPeriods.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Chatbot;
+
+use Symfony\Component\Clock\ClockInterface;
+
+/**
+ * The named travel periods of the website search ("Reisezeitraum"), from the
+ * `chatbot_travel_periods` parameter.
+ *
+ * Duplicated from the TYPO3 search configuration on purpose, and updated together with it
+ * each season. Periods may overlap. A period whose end has passed is no longer offered.
+ */
+class TravelPeriods
+{
+    /**
+     * @param list<array{label: string, from: string, to: string}> $periods
+     */
+    public function __construct(
+        private readonly array $periods,
+        private readonly ClockInterface $clock,
+    ) {
+    }
+
+    /**
+     * The date range of a current period, matched case-insensitively, or null.
+     *
+     * @return array{from: \DateTimeImmutable, to: \DateTimeImmutable}|null
+     */
+    public function find(string $label): ?array
+    {
+        foreach ($this->current() as $period) {
+            if (0 === strcasecmp($period['label'], trim($label))) {
+                return ['from' => new \DateTimeImmutable($period['from']), 'to' => new \DateTimeImmutable($period['to'])];
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * @return list<string>
+     */
+    public function labels(): array
+    {
+        return array_column($this->current(), 'label');
+    }
+
+    /**
+     * @return list<array{label: string, from: string, to: string}>
+     */
+    private function current(): array
+    {
+        $today = $this->clock->now()->setTimezone(new \DateTimeZone('Europe/Berlin'))->format('Y-m-d');
+
+        return array_values(array_filter($this->periods, static fn (array $period): bool => $period['to'] >= $today));
+    }
+}