From b4db0cb8f219556cab1adf04326b0c26c9143388 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Fromme?= <fromme@dreipunktnull.com>
Date: Fri, 18 Jul 2025 15:59:45 +0200
Subject: [PATCH] wip: booking process, refactor participant room assignment
 logic

---
 src/Form/BookingCreateStep2Type.php           | 101 +++++++++---------
 .../DataAdapters/ParticipantDataAdapter.php   |  34 ++++++
 2 files changed, 83 insertions(+), 52 deletions(-)
 create mode 100644 src/Form/DataAdapters/ParticipantDataAdapter.php

diff --git a/src/Form/BookingCreateStep2Type.php b/src/Form/BookingCreateStep2Type.php
index dd14fdf..0e5baed 100644
--- a/src/Form/BookingCreateStep2Type.php
+++ b/src/Form/BookingCreateStep2Type.php
@@ -2,6 +2,7 @@
 
 namespace App\Form;
 
+use App\Form\DataAdapters\ParticipantDataAdapter;
 use App\Form\Model\BookingCreateDto;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\CollectionType;
@@ -29,49 +30,9 @@ class BookingCreateStep2Type extends AbstractType
             return;
         }
 
-        // Count participants assigned to each room
-        $roomOccupancy = [];
-        foreach ($bookingCreateDto->participants as $participant) {
-            if (null !== $participant->assignedRoomId) {
-                $roomOccupancy[$participant->assignedRoomId] = ($roomOccupancy[$participant->assignedRoomId] ?? 0) + 1;
-            }
-        }
-
-        // Generate per-participant room choices
-        $roomChoices = [];
-        foreach ($bookingCreateDto->participants as $index => $participant) {
-            $participantRoomChoices = [];
-
-            foreach ($bookingCreateDto->getSelectedRooms() as $roomSelection) {
-                $currentOccupancy = $roomOccupancy[$roomSelection->roomId] ?? 0;
-
-                // If this participant is already assigned to this room, exclude them from occupancy count
-                $adjustedOccupancy = $currentOccupancy;
-                if ($participant->assignedRoomId === $roomSelection->roomId) {
-                    --$adjustedOccupancy;
-                }
-
-                $remainingCapacity = $roomSelection->minPax - $adjustedOccupancy;
-
-                // Include room if it has capacity OR if it's the participant's current assignment
-                if ($remainingCapacity > 0 || $participant->assignedRoomId === $roomSelection->roomId) {
-                    $participantRoomChoices[$roomSelection->roomLabel] = $roomSelection->roomId;
-                }
-            }
-
-            $roomChoices[$index] = $participantRoomChoices;
-        }
-
-        // Create a custom form type that handles per-participant room choices
-        $form->add('participants', CollectionType::class, [
-            'entry_type' => BookingCreateParticipantType::class,
-            'allow_add' => false,
-            'allow_delete' => false,
-            'by_reference' => false,
-            'entry_options' => [
-                'room_choices' => $roomChoices,
-            ],
-        ]);
+        $adapter = new ParticipantDataAdapter($bookingCreateDto->participants);
+        $roomChoices = $this->generateRoomChoices($adapter, $bookingCreateDto->getSelectedRooms());
+        $this->addParticipantsField($form, $roomChoices);
     }
 
     public function onPreSubmit(FormEvent $event): void
@@ -81,20 +42,46 @@ class BookingCreateStep2Type extends AbstractType
         /** @var BookingCreateDto $bookingCreateDto */
         $bookingCreateDto = $form->getData();
 
+        $adapter = new ParticipantDataAdapter($data['participants']);
+        $roomChoices = $this->generateRoomChoices($adapter, $bookingCreateDto->getSelectedRooms());
+        $form->remove('participants');
+        $this->addParticipantsField($form, $roomChoices);
+    }
+
+    /**
+     * Calculates room occupancy based on participant assignments.
+     *
+     * @return array<int, int>
+     */
+    private function calculateRoomOccupancy(ParticipantDataAdapter $adapter): array
+    {
         $roomOccupancy = [];
-        foreach ($data['participants'] as $participant) {
-            if (null !== $participant['assignedRoomId']) {
-                $assignedRoomId = (int) $participant['assignedRoomId'];
+
+        foreach ($adapter->getParticipants() as $participant) {
+            $assignedRoomId = $adapter->getAssignedRoomId($participant);
+            if (null !== $assignedRoomId) {
                 $roomOccupancy[$assignedRoomId] = ($roomOccupancy[$assignedRoomId] ?? 0) + 1;
             }
         }
 
-        $roomChoices = [];
-        foreach ($data['participants'] as $index => $participant) {
-            $participantRoomChoices = [];
-            $assignedRoomId = (int) $participant['assignedRoomId'];
+        return $roomOccupancy;
+    }
 
-            foreach ($bookingCreateDto->getSelectedRooms() as $roomSelection) {
+    /**
+     * Generates room choices for each participant based on availability and current assignments.
+     *
+     * @return array<int, array<string, int>>
+     */
+    private function generateRoomChoices(ParticipantDataAdapter $adapter, array $selectedRooms): array
+    {
+        $roomOccupancy = $this->calculateRoomOccupancy($adapter);
+        $roomChoices = [];
+
+        foreach ($adapter->getParticipants() as $index => $participant) {
+            $participantRoomChoices = [];
+            $assignedRoomId = $adapter->getAssignedRoomId($participant);
+
+            foreach ($selectedRooms as $roomSelection) {
                 $currentOccupancy = $roomOccupancy[$roomSelection->roomId] ?? 0;
 
                 // If this participant is already assigned to this room, exclude them from occupancy count
@@ -113,7 +100,17 @@ class BookingCreateStep2Type extends AbstractType
 
             $roomChoices[$index] = $participantRoomChoices;
         }
-        $form->remove('participants');
+
+        return $roomChoices;
+    }
+
+    /**
+     * Adds the participants collection field to the form with the given room choices.
+     *
+     * @param array<int, array<string, int>> $roomChoices
+     */
+    private function addParticipantsField(FormInterface $form, array $roomChoices): void
+    {
         $form->add('participants', CollectionType::class, [
             'entry_type' => BookingCreateParticipantType::class,
             'allow_add' => false,
diff --git a/src/Form/DataAdapters/ParticipantDataAdapter.php b/src/Form/DataAdapters/ParticipantDataAdapter.php
new file mode 100644
index 0000000..b88af11
--- /dev/null
+++ b/src/Form/DataAdapters/ParticipantDataAdapter.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\DataAdapters;
+
+/**
+ * Adapter pattern to unify access to participant data regardless of whether it comes from
+ * objects (during PRE_SET_DATA) or arrays (during PRE_SUBMIT).
+ */
+class ParticipantDataAdapter
+{
+    private array $participants;
+
+    public function __construct(array $participants)
+    {
+        $this->participants = $participants;
+    }
+
+    public function getParticipants(): array
+    {
+        return $this->participants;
+    }
+
+    public function getAssignedRoomId(mixed $participant): ?int
+    {
+        if (is_array($participant)) {
+            $assignedRoomId = $participant['assignedRoomId'] ?? null;
+            return null !== $assignedRoomId ? (int) $assignedRoomId : null;
+        }
+
+        return $participant->assignedRoomId;
+    }
+}