2nd chunk

modules.local/ppcp-api-client/src/Factory/PatchCollectionFactory.php

@@ -0,0 +1,64 @@
+<?php
+declare(strict_types=1);
+
+namespace Inpsyde\PayPalCommerce\ApiClient\Factory;
+
+
+use Inpsyde\PayPalCommerce\ApiClient\Entity\Order;
+use Inpsyde\PayPalCommerce\ApiClient\Entity\Patch;
+use Inpsyde\PayPalCommerce\ApiClient\Entity\PatchCollection;
+use Inpsyde\PayPalCommerce\ApiClient\Entity\PurchaseUnit;
+
+class PatchCollectionFactory
+{
+
+    public function fromOrders(Order $from, Order $to) : PatchCollection {
+        $allPatches = [];
+        $allPatches += $this->purchaseUnits($from->purchaseUnits(), $to->purchaseUnits());
+
+        return new PatchCollection(...$allPatches);
+    }
+
+    /**
+     * ToDo: This patches the purchaseUnits. The way we do it right now, we simply always patch. This simplifies the
+     * process but the drawback is, we always have to send a patch request.
+     *
+     * @param PurchaseUnit[] $from
+     * @param PurchaseUnit[] $to
+     * @return Patch[]
+     */
+    private function purchaseUnits(array $from, array $to) : array {
+        $patches = [];
+
+        $path = '/purchase_units';
+        foreach ($to as $purchaseUnitTo) {
+            $needsUpdate = ! count(
+                array_filter(
+                    $from,
+                    function(PurchaseUnit $unit) use ($purchaseUnitTo) : bool {
+                        return $unit == $purchaseUnitTo;
+                    }
+                )
+            );
+            if (!$needsUpdate) {
+                continue;
+            }
+            $purchaseUnitFrom = current(array_filter(
+                $from,
+                function(PurchaseUnit $unit) use ($purchaseUnitTo) : bool
+                {
+                    return $purchaseUnitTo->referenceId() === $unit->referenceId();
+                }
+            ));
+            $operation = $purchaseUnitFrom ? 'replace' : 'add';
+            $value = $purchaseUnitTo->toArray();
+            $patches[] = new Patch(
+                $operation,
+                $path . "/@reference_id=='" . $purchaseUnitTo->referenceId() . "'",
+                $value
+            );
+        }
+
+        return $patches;
+    }
+}