From 07088c94e79d1e9c99ea653c7067a350703d376b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20B=C3=B6hmer?= <mail@jan-boehmer.de>
Date: Fri, 24 Nov 2023 23:48:39 +0100
Subject: [PATCH] Implemented logic for not (yet) used EntityMerger service

---
 src/Services/EntityMergers/EntityMerger.php   | 47 +++++++++++++++++++
 .../Mergers/EntityMergerInterface.php         |  3 ++
 .../EntityMergers/Mergers/PartMerger.php      |  3 +-
 3 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/Services/EntityMergers/EntityMerger.php b/src/Services/EntityMergers/EntityMerger.php
index 7dcc91af..0f1355ea 100644
--- a/src/Services/EntityMergers/EntityMerger.php
+++ b/src/Services/EntityMergers/EntityMerger.php
@@ -23,7 +23,54 @@ declare(strict_types=1);
 
 namespace App\Services\EntityMergers;
 
+use App\Services\EntityMergers\Mergers\EntityMergerInterface;
+use Symfony\Component\DependencyInjection\Attribute\TaggedIterator;
+
+/**
+ * This service is used to merge two entities together.
+ * It automatically finds the correct merger (implementing EntityMergerInterface) for the two entities if one exists.
+ */
 class EntityMerger
 {
+    public function __construct(#[TaggedIterator('app.entity_merger')] protected iterable $mergers)
+    {
+    }
 
+    /**
+     * This function finds the first merger that supports merging the other entity into the target entity.
+     * @param  object  $target
+     * @param  object  $other
+     * @param  array  $context
+     * @return EntityMergerInterface|null
+     */
+    public function findMergerForObject(object $target, object $other, array $context = []): ?EntityMergerInterface
+    {
+        foreach ($this->mergers as $merger) {
+            if ($merger->supports($target, $other, $context)) {
+                return $merger;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * This function merges the other entity into the target entity. If no merger is found an exception is thrown.
+     * The target entity will be modified and returned.
+     * @param  object  $target
+     * @param  object  $other
+     * @param  array  $context
+     * @template T of object
+     * @phpstan-param T $target
+     * @phpstan-param T $other
+     * @phpstan-return T
+     * @return object
+     */
+    public function merge(object $target, object $other, array $context = []): object
+    {
+        $merger = $this->findMergerForObject($target, $other, $context);
+        if ($merger === null) {
+            throw new \RuntimeException('No merger found for merging '.get_class($other).' into '.get_class($target));
+        }
+        return $merger->merge($target, $other, $context);
+    }
 }
\ No newline at end of file
diff --git a/src/Services/EntityMergers/Mergers/EntityMergerInterface.php b/src/Services/EntityMergers/Mergers/EntityMergerInterface.php
index 838bc1d6..046fc0ea 100644
--- a/src/Services/EntityMergers/Mergers/EntityMergerInterface.php
+++ b/src/Services/EntityMergers/Mergers/EntityMergerInterface.php
@@ -24,9 +24,12 @@ declare(strict_types=1);
 namespace App\Services\EntityMergers\Mergers;
 
 
+use Symfony\Component\DependencyInjection\Attribute\AutoconfigureTag;
+
 /**
  * @template T of object
  */
+#[AutoconfigureTag('app.entity_merger')]
 interface EntityMergerInterface
 {
     /**
diff --git a/src/Services/EntityMergers/Mergers/PartMerger.php b/src/Services/EntityMergers/Mergers/PartMerger.php
index 7e96d20f..c29ed960 100644
--- a/src/Services/EntityMergers/Mergers/PartMerger.php
+++ b/src/Services/EntityMergers/Mergers/PartMerger.php
@@ -32,9 +32,10 @@ use App\Entity\PriceInformations\Orderdetail;
 use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
 
 /**
+ * This class merges two parts together.
+ *
  * @implements EntityMergerInterface<Part>
  */
-#[Autoconfigure(public: true)]
 class PartMerger implements EntityMergerInterface
 {