- Updating Code Comments

- Updating variable names

swift/Sources/GildedRose/CustomisedItemFactory.swift

@@ -8,12 +8,12 @@
 import Foundation
 
 protocol CustomisedItemFactoryCreator {
-    static func getCustomisedItem(item: Item) -> CustomisedItem
+    func getCustomisedItem(item: Item) -> CustomisedItem
 }
 
 class CustomisedItemFactory: CustomisedItemFactoryCreator {
-    // Returns the Customised Item based on the Item name
+    // Returns the Created Customised Item based on the Item name
-    class func getCustomisedItem(item: Item) -> CustomisedItem {
+     func getCustomisedItem(item: Item) -> CustomisedItem {
         switch item.name {
         case ItemNameConstants.kAgedBrieItem:
             return AgedBrieItem(item: item)
@@ -27,3 +27,24 @@ class CustomisedItemFactory: CustomisedItemFactoryCreator {
     }
 }
 
+class CustomisedItemFactoryWithNewItems: CustomisedItemFactory {
+    // Creates Conjured Item for newly added Conjured Item. For the old items calls the super class function
+    override func getCustomisedItem(item: Item) -> CustomisedItem {
+        switch item.name {
+        case ItemNameConstants.kConjuredItem:
+            return ConjuredItem(item: item)
+        default:
+           return super.getCustomisedItem(item: item)
+        }
+    }
+}
+
+final class CustomItemFactoryManager {
+    var itemFactory: CustomisedItemFactoryCreator
+    public init(customItemFactory: CustomisedItemFactoryCreator) {
+        self.itemFactory = customItemFactory
+    }
+     func getCustomisedItem(item: Item) -> CustomisedItem {
+        return itemFactory.getCustomisedItem(item: item)
+    }
+}

swift/Sources/GildedRose/GildedRose.swift

@@ -6,6 +6,7 @@ public class GildedRose {
     }
     
     public func updateQuality() {
-       _ = items.map({CustomisedItemFactory.getCustomisedItem(item: $0).updateItemState()})
+        let itemFactoryManager = CustomItemFactoryManager(customItemFactory: CustomisedItemFactoryWithNewItems())
+       _ = items.map({ itemFactoryManager.getCustomisedItem(item: $0).updateItemState()})
     }
 }

swift/Sources/GildedRose/ItemQualityUpdater.swift

@@ -14,15 +14,17 @@ protocol ItemQualityUpdater: CustomisedItem {
 }
 
 extension ItemQualityUpdater {
-   
+   // Reduces the item Quality by the value passed as parameter
     func reduceItemQuality(by value:Int) {
         item.quality -= value
     }
     
+    // Increases Item Quality by the value passed as parameter
     func increaseItemQuality(by value:Int) {
         item.quality += value
     }
     
+    // Sets the Item Quality to the value passed as parameter
     func setItemQuality(to value: Int){
         item.quality = value
     }

swift/Sources/GildedRose/ItemSellInUpdater.swift

@@ -8,11 +8,17 @@
 import Foundation
 
 protocol ItemSellInUpdater: CustomisedItem{
-    func reduceSellInDays(by days: Int)
+    var decreasingNumberOfSellInDays: Int { get }
+    func updateSellInDays()
 }
 
 extension ItemSellInUpdater {
-    func reduceSellInDays(by days: Int) {
+    var decreasingNumberOfSellInDays: Int {
-        item.sellIn -= days
+           return 1
+    }
+    
+    // Reduces the sell in days by 1
+    func updateSellInDays() {
+        item.sellIn -= decreasingNumberOfSellInDays
     }
 }

swift/Sources/GildedRose/Items/AgedBrieItem.swift

@@ -8,6 +8,7 @@
 import Foundation
 
 struct AgedBrieItem: CustomisedItem, ItemStateUpdater{
+    
     var item: Item
     
     private var isItemUnderHighestQuality: Bool {
@@ -20,7 +21,7 @@ struct AgedBrieItem: CustomisedItem, ItemStateUpdater{
     
     func updateItemState() {
         // update the sell in days. Reduce the Sell In days by 1
-        self.reduceSellInDays(by: 1)
+        self.updateSellInDays()
         
         // Increment the Item quality by 1 if the quality is less than 50
         guard isItemUnderHighestQuality else { return }

swift/Sources/GildedRose/Items/BackstagePassesItem.swift

@@ -8,6 +8,7 @@
 import Foundation
 
 struct BackstagePassesItem: CustomisedItem, ItemStateUpdater {
+    
     var item: Item
     
     private var isItemUnderHighestQuality: Bool {
@@ -24,9 +25,9 @@ struct BackstagePassesItem: CustomisedItem, ItemStateUpdater {
     
     func updateItemState() {
         // Reduce the Sell in days by 1
-        reduceSellInDays(by: 1)
+        updateSellInDays()
         
-        // If the sell in date id passed, sets the quality of item to 0
+        // If the sell in date is passed, sets the quality of item to 0
         guard !isSellInDatePassed else {
             setItemQuality(to: ValueConstants.kLowestQualityValue)
             return

swift/Sources/GildedRose/Items/ConjuredItem.swift

@@ -8,8 +8,8 @@
 import Foundation
 
 class ConjuredItem: StandardItem{
-    
+   // Overrides decreasingQualityValueBeforeSellInDate property of Standard item as the Conjured Item degrades twice fast than Standard Iten
-    override var decreasingValueOverZeroDaysToSell: Int {
+    override var decreasingQualityValueBeforeSellInDate: Int {
         return 2
     }
     override init(item: Item) {

swift/Sources/GildedRose/Items/StandardItem.swift

@@ -11,14 +11,14 @@ class StandardItem: CustomisedItem, ItemStateUpdater {
     var item: Item
     
     private var isSellInDatePassed: Bool{
-        return item.sellIn < 0
+        return item.sellIn < 0 
     }
     
-    var decreasingValueOverZeroDaysToSell: Int {
+    var decreasingQualityValueBeforeSellInDate: Int {
-        return 1
+        return 1 // Quality degrades by 1 if the sellIn date is not passed
     }
-    private var decreasingValueForZeroOrLessDaysToSell: Int {
+    private var decreasingQualityValueAfterSellInDate: Int {
-        return 2 * decreasingValueOverZeroDaysToSell
+        return 2 * decreasingQualityValueBeforeSellInDate // Quality degrades twice after SellIn date is passed
     }
     
     private  var isItemMoreThanLowestQuality: Bool {
@@ -31,10 +31,10 @@ class StandardItem: CustomisedItem, ItemStateUpdater {
     
     func updateItemState() {
         // Reduce the sellIn days for Item by 1
-        reduceSellInDays(by: 1)
+        updateSellInDays()
         
         // Reduce the item quality by 1 , if the sell in date is passed decrement by double the value
-        isSellInDatePassed ? reduceItemQuality(by: decreasingValueForZeroOrLessDaysToSell) : reduceItemQuality(by: decreasingValueOverZeroDaysToSell)
+        isSellInDatePassed ? reduceItemQuality(by: decreasingQualityValueAfterSellInDate) : reduceItemQuality(by: decreasingQualityValueBeforeSellInDate)
         
         guard isItemMoreThanLowestQuality else {
             // Sets the quality to zero if the quality is negative