Merge pull request #47 from lermannen/elixir

Proposed fix for #34: Implement a working version of the original code for the kata

elixir/lib/gilded_rose.ex

@@ -1,48 +1,83 @@
 defmodule GildedRose do
   # Example
   # update_quality([%Item{name: "Backstage passes to a TAFKAL80ETC concert", sell_in: 9, quality: 1}])
-  # => [%Item{name: "Backstage passes to a TAFKAL80ETC concert", sell_in: 9, quality: 3}]
+  # => [%Item{name: "Backstage passes to a TAFKAL80ETC concert", sell_in: 8, quality: 3}]
 
   def update_quality(items) do
     Enum.map(items, &update_item/1)
   end
 
   def update_item(item) do
-    cond do
+    item = cond do
-      item.quality == 0 ->
+      item.name != "Aged Brie" && item.name != "Backstage passes to a TAFKAL80ETC concert" ->
-        item
+        if item.quality > 0 do
-      item.sell_in < 0 && item.name == "Backstage passes to a TAFKAL80ETC concert" ->
+          if item.name != "Sulfuras, Hand of Ragnaros" do
-        %{item | quality: 0}
-      item.name == "Aged Brie" || item.name == "Backstage passes to a TAFKAL80ETC concert" ->
-        if item.name == "Backstage passes to a TAFKAL80ETC concert" && item.sell_in > 5 && item.sell_in <= 10 do
-          %{item | quality: item.quality + 2}
-        else
-          if item.name == "Backstage passes to a TAFKAL80ETC concert" && item.sell_in >= 0 && item.sell_in <= 5 do
-            %{item | quality: item.quality + 3}
-          else
-            if item.quality < 50 do
-              %{item | quality: item.quality + 1}
-            else
-              item
-            end
-          end
-        end
-      item.sell_in < 0 ->
-        if item.name == "Backstage passes to a TAFKAL80ETC concert" do
-          %{item | quality: 0}
-        else
-          if item.name == "+5 Dexterity Vest" || item.name == "Elixir of the Mongoose" do
-            %{item | quality: item.quality - 2}
-          else
-            item
-          end
-        end
-      item.name == "+5 Dexterity Vest" || item.name == "Elixir of the Mongoose" ->
             %{item | quality: item.quality - 1}
+          else
+            item
+          end
+        else
+          item
+        end
+      true ->
+        cond do
+          item.quality < 50 ->
+            item = %{item | quality: item.quality + 1}
+            cond do
+              item.name == "Backstage passes to a TAFKAL80ETC concert" ->
+                item = cond do
+                  item.sell_in < 11 ->
+                    cond do
+                      item.quality < 50 ->
+                        %{item | quality: item.quality + 1}
+                      true -> item
+                    end
+                  true -> item
+                end
+                cond do
+                  item.sell_in < 6 ->
+                    cond do
+                      item.quality < 50 ->
+                        %{item | quality: item.quality + 1}
+                      true -> item
+                    end
+                  true -> item
+                end
+              true -> item
+            end
+          true -> item
+        end
+    end
+    item = cond do
+      item.name != "Sulfuras, Hand of Ragnaros" ->
+        %{item | sell_in: item.sell_in - 1}
+      true -> item
+    end
+    cond do
+      item.sell_in < 0 ->
+        cond do
+          item.name != "Aged Brie" ->
+            cond do
+              item.name != "Backstage passes to a TAFKAL80ETC concert" ->
+                cond do
+                  item.quality > 0 ->
+                    cond do
                       item.name != "Sulfuras, Hand of Ragnaros" ->
                         %{item | quality: item.quality - 1}
+                      true -> item
+                    end
+                  true -> item
+                end
+              true -> %{item | quality: item.quality - item.quality}
+            end
           true ->
-        item
+            cond do
+              item.quality < 50 ->
+                %{item | quality: item.quality + 1}
+              true -> item
+            end
+        end
+      true -> item
     end
   end
 end