From 9e0fbcb360edf9edf7f83c7e3e88bec747433885 Mon Sep 17 00:00:00 2001
From: degwinthegreat <the.colledge.dropout@gmail.com>
Date: Fri, 14 May 2021 21:03:34 +0900
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B8=80=E9=83=A8=20=E5=AE=8C?=
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---
 ruby/gilded_rose.rb | 51 ++++++++++++++++++++++++++-------------------
 1 file changed, 30 insertions(+), 21 deletions(-)

diff --git a/ruby/gilded_rose.rb b/ruby/gilded_rose.rb
index 6b7f619c..b375986e 100644
--- a/ruby/gilded_rose.rb
+++ b/ruby/gilded_rose.rb
@@ -11,27 +11,14 @@ class GildedRose
     @items = items
   end
 
-  def increment_item_quality(item, num = 1)
-    item.quality = [item.quality + num, QUALITY_THRESHOLD].min
-  end
-
-  def first_step(item)
-    case item.name
-    when AGED_BRIE
-      increment_item_quality(item)
-    when BACKSTAGE_PASS
-      increment_amount = case item.sell_in
-      when (11..) then 1
-      when (6...11) then 2
-      when (...6) then 3
-      end
-      increment_item_quality(item, increment_amount)
-    else
-      if item.quality > 0
-        item.quality = item.quality - 1
-      end
-    end
-  end
+  # - AGED_BRIEは時間とともに品質が上がり、販売期限が過ぎるとさらに品質が上がる
+  # - SULFURASについては何もしない
+  # - 通常のitemは徐々に品質が下がり、販売期限が下がるとさらに品質が下がる
+  # - アイテムの品質は50まで
+  # - item quority は 0以下にはならないk
+  # - BACKSTAGE_PASSは、sell in  11 以上のときは + 1
+  # - BACKSTAGE_PASSは、sell in  6-10のときは + 2
+  # - BACKSTAGE_PASSは、sell in  6 以下のときは + 3
 
   def update_quality()
     @items.each do |item|
@@ -52,6 +39,28 @@ class GildedRose
       end
     end
   end
+
+  def first_step(item)
+    case item.name
+    when AGED_BRIE
+      increment_item_quality(item)
+    when BACKSTAGE_PASS
+      increment_amount = case item.sell_in
+      when (11..) then 1
+      when (6...11) then 2
+      when (...6) then 3
+      end
+      increment_item_quality(item, increment_amount)
+    else
+      if item.quality > 0
+        item.quality = item.quality - 1
+      end
+    end
+  end
+
+  def increment_item_quality(item, num = 1)
+    item.quality = [item.quality + num, QUALITY_THRESHOLD].min
+  end
 end
 
 class Item