R-01 Add interface and create methods

php/src/GildedRose.php

@@ -4,7 +4,9 @@ declare(strict_types=1);
 
 namespace GildedRose;
 
-final class GildedRose
+use GildedRose\GildedRoseInterface;
+
+final class GildedRose implements GildedRoseInterface
 {
     /**
      * @var Item[]
@@ -19,6 +21,18 @@ final class GildedRose
     public function updateQuality(): void
     {
         foreach ($this->items as $item) {
+
+            $this->firstProcessingRule($item);
+
+            $this->secondProcessingRule($item);
+
+            $this->thirdProcessingRule($item);
+        }
+    }
+
+    public function firstProcessingRule(&$item)
+    {
+
         if ($item->name != 'Aged Brie' and $item->name != 'Backstage passes to a TAFKAL80ETC concert') {
             if ($item->quality > 0) {
                 if ($item->name != 'Sulfuras, Hand of Ragnaros') {
@@ -42,11 +56,18 @@ final class GildedRose
                 }
             }
         }
+    }
 
+    public function secondProcessingRule(&$item)
+    {
         if ($item->name != 'Sulfuras, Hand of Ragnaros') {
             $item->sell_in = $item->sell_in - 1;
         }
 
+    }
+
+    public function thirdProcessingRule(&$item)
+    {
         if ($item->sell_in < 0) {
             if ($item->name != 'Aged Brie') {
                 if ($item->name != 'Backstage passes to a TAFKAL80ETC concert') {
@@ -65,5 +86,5 @@ final class GildedRose
             }
         }
     }
-    }
+
 }

php/src/GildedRoseInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+
+namespace GildedRose;
+
+use GildedRose\Item;
+
+interface GildedRoseInterface
+{
+    public function updateQuality();
+
+    public function firstProcessingRule(Item &$item);
+
+    public function secondProcessingRule(Item &$item);
+
+    public function thirdProcessingRule(Item &$item);
+
+}