Add weapon upgrades and more money-sinky upgrade function

Assets/Resources/UpgradeShop.asset

@@ -12,5 +12,5 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 3145dd14dac0cf84a909862b61ec2893, type: 3}
   m_Name: UpgradeShop
   m_EditorClassIdentifier: 
-  PriceModifier: 5
+  PriceModifier: 3
   UpgradeFactor: 1.5

Assets/Scripts/Shop/Model/ItemArmor.cs

@@ -8,10 +8,14 @@ public class ItemArmor : Item
 
     public int Block { get; private set; }
     
+    private readonly int startPrice;    // Represents the price this is worth without upgrades - for price calculation
+
     public ItemArmor(string name, string iconName, int pbasePrice,int pDefense, int pBlock, string descr = "", ItemRarity rarity = ItemRarity.Common) : base(name, iconName, pbasePrice, descr,rarity)
     {
         Block = pBlock;
         Defense = pDefense;
+        
+        startPrice = basePrice;
     }
 
     // This is used so we can identify a type purely through polymorphism. No hardcoding of types involved, nothing to see here!
@@ -35,6 +39,6 @@ public class ItemArmor : Item
 
     public override int GetUpgradeCosts(float upgradeFactor)
     {
-        return (int) (((basePrice * upgradeFactor) - basePrice));   
+        return (int) (((basePrice * upgradeFactor) - startPrice));  
     }
 }

Assets/Scripts/Shop/Model/ItemPotion.cs

@@ -8,6 +8,7 @@ public class ItemPotion : Item
     public readonly int Effect;
     public readonly PotionType Type;
     public readonly int Time;   // How long does this potion last? We don't have any use for it. Just here to demonstrate the item system
+    
     public ItemPotion(string name, string iconName, int pbasePrice,int effect, PotionType type, int time = -1, string descr = "", ItemRarity rarity = ItemRarity.Common) : base(name, iconName, pbasePrice, descr,rarity)
     {
         Effect = effect;
@@ -30,7 +31,7 @@ public class ItemPotion : Item
 
     public override void Upgrade(float upgradeFactor)
     {
-        throw new NotImplementedException();
+        // Potions can't be upgraded
     }
 
     public override int GetUpgradeCosts(float upgradeFactor)

Assets/Scripts/Shop/Model/ItemWeapon.cs

@@ -4,12 +4,15 @@ using UnityEngine;
 
 public class ItemWeapon : Item
 {
-    public readonly int Attack;
+    public int Attack { get; private set; }
-    public readonly int Damage;
+    public int Damage { get; private set; }
+
+    private readonly int startPrice;    // Represents the price this is worth without upgrades - for price calculation
     public ItemWeapon(string name, string iconName, int pbasePrice,int pAttack, int pDamage, string descr = "", ItemRarity rarity = ItemRarity.Common) : base(name, iconName, pbasePrice, descr,rarity)
     {
         Attack = pAttack;
         Damage = pDamage;
+        startPrice = basePrice;
     }
 
     public override ItemType GetItemType()
@@ -24,11 +27,14 @@ public class ItemWeapon : Item
 
     public override void Upgrade(float upgradeFactor)
     {
-        throw new System.NotImplementedException();
+        Attack = (int) (Attack * upgradeFactor);     // Don't wanna randomise upgrades for now, to be honest
+        Damage = (int) (Damage * upgradeFactor);
+        // We increase value, but only by half as much as the upgrade improved stats. No one wants to buy a bad item upgraded to be passable. Cost to do so is higher by as much as the upgrade shop charges extra
+        basePrice += (int)(GetUpgradeCosts(upgradeFactor) * 0.5);    // The goal is to make upgrading an endless money sink, and incentivise buying better base items
     }
 
     public override int GetUpgradeCosts(float upgradeFactor)
     {
-        return 0;
+        return (int) (((basePrice * upgradeFactor) - startPrice));
     }
 }