Made price of upgrade be required

Assets/Scripts/Global/MoneyController.cs

@@ -17,6 +17,18 @@ namespace Fruitomation.Global
             Instance.InternalCurrentMoney += amount;
         }
 
+        public static bool CanBuy(double amount)
+        {
+            double val = Instance.InternalCurrentMoney - amount;
+            if (val > 0f)
+            {
+                Instance.InternalCurrentMoney = val;
+                return true;
+            }
+
+            return false;
+        }
+
         private void Awake()
         {
             if (Instance is not null)

Assets/Scripts/UI/BasicUpgradeButton.cs

@@ -5,6 +5,7 @@ using UnityEngine.UI;
 using UnityEngine;
 using System.Linq;
 using System;
+using Fruitomation.Global;
 using PashaBibko.Pacore.Attributes;
 
 namespace Fruitomation.UI
@@ -101,7 +102,16 @@ namespace Fruitomation.UI
 
         private void OnButtonClicked()
         {
-            UpgradeManager.Unlock(Upgrade);
+            if (Cost == 0f)
+            {
+                Debug.LogWarning("Upgrade Cost has not been set");
+                return;
+            }
+
+            if (MoneyController.CanBuy(Cost))
+            {
+                UpgradeManager.Unlock(Upgrade);
+            }
         }
 
         private bool IsUnlockable =>
@@ -156,13 +166,15 @@ namespace Fruitomation.UI
 
             AttachedButton.interactable = State == UpgradeState.Unlockable;
 
+            string cost = Cost == 0f ? "UNAVAILABLE" : $"{Cost:F1}";
+
             // https://stackoverflow.com/questions/27040325/c-sharp-regex-to-convert-camelcase-to-sentence-case
             string formatted = Regex.Replace(Upgrade.ToString(), "[A-Z]", " $0")[1..];
             AttachedText.text = State switch
             {
                 UpgradeState.Hidden => "???",
                 UpgradeState.Viewable => $"{formatted}",
-                UpgradeState.Unlockable => $"{formatted}\n{Cost:F1}",
+                UpgradeState.Unlockable => $"{formatted}\n{cost}",
                 UpgradeState.Unlocked => $"{formatted}\nUnlocked",
                 var _ => throw new ArgumentOutOfRangeException()
             };

Assets/Scripts/UI/BuildingUnlockButton.cs

@@ -1,5 +1,6 @@
 using System.Text.RegularExpressions;
 using Fruitomation.Game;
+using Fruitomation.Global;
 using UnityEngine.UI;
 using UnityEngine;
 
@@ -28,16 +29,26 @@ namespace Fruitomation.UI
             string formatted = Regex.Replace(Building.ToString(), "[A-Z]", " $0")[1..];
             bool unlocked = UpgradeManager.Is(Building);
             
+            string cost = Cost == 0f ? "UNAVAILABLE" : $"{Cost:F1}";
             AttachedText.text = unlocked
                 ? $"{formatted}\nUnlocked"
-                : $"{formatted}\n{Cost:F1}";
+                : $"{formatted}\n{cost}";
             
             AttachedButton.interactable = !unlocked;
         }
 
         private void OnButtonClicked()
         {
-            UpgradeManager.Unlock(Building);
+            if (Cost == 0f)
+            {
+                Debug.LogWarning("Upgrade Cost has not been set");
+                return;
+            }
+
+            if (MoneyController.CanBuy(Cost))
+            {
+                UpgradeManager.Unlock(Building);
+            }
         }
     }
 }