Give $1000 starting out and track money [ Paper trades ]

WebServer/Controllers/Payments/IPayments.cs

@@ -3,7 +3,7 @@ namespace Controllers.Payment {
     public interface IPayment {
 
         // [ Success, ErrorMessage | ImpodentKey ]
-        public (bool, string) CreatePayment();
+        public (bool, string) CreatePayment(string User);
 
         // [ Success, ErrorMessage ]
         public (bool, string) TryPayment(string ImpodentKey, float Price);

WebServer/Controllers/Payments/PaymentTester.cs

@@ -1,27 +1,72 @@
+using Controllers.DataBase;
+
 namespace Controllers.Payment {
 
     public class PaymentTestor : IPayment {
+        
+        static List<ImpodentKey> ImpodentKeys = new List<ImpodentKey>();
+        DbDriver? _DBdriver = null;
 
-        public static List<string> ImpodentKeys = new List<string>();
+        // Inject the DB driver
+        public PaymentTestor() { _DBdriver = new DbDriver(); }
 
-        public (bool, string) CreatePayment() {
+        public (bool, string) CreatePayment(string user) {
             string guid = Guid.NewGuid().ToString();
-            ImpodentKeys.Add(guid);
+            ImpodentKeys.Add(new ImpodentKey{ Key = guid, User = user });
             return (true, guid);
         }
 
         public (bool, string) TryPayment(string ImpodentKey, float Price) {
             try {
-                if (ImpodentKeys.Contains(ImpodentKey)) {
-                    ImpodentKeys.Remove(ImpodentKey);
-                    return (true, "");
-                } else {
+                // Find the impotency key
+                ImpodentKey? found = null;
+                foreach( ImpodentKey key in ImpodentKeys) {
+                    if (key.Key == ImpodentKey) {
+                        found = key;
+                        break;
+                    }
+                }
+                if (found == null) {
                     return (false, "Payment session closed or never existed");
                 }
+
+                // Make sure the database is injected correctly
+                if (_DBdriver == null) {
+                    found.Processed = true;
+                    return (false, "The Database cannot be loaded");
+                }
+
+                // Get the users money
+                string dbPrefix = $"[{found.User.ToLower()}]:";
+                bool passed = float.TryParse(_DBdriver.Get( dbPrefix + "money" ), out float result);
+                if (!passed) {
+                    found.Processed = true;
+                    return (false, "Unable to parse money from the database");
+                }
+
+                // Make sure the user has enough money
+                if (result < Price) {
+                    found.Processed = true;
+                    return (false, "You dont have enough money to purchase this item");
+                }
+
+                // Remove the money and save
+                _DBdriver.Set( dbPrefix + "money", (result - Price).ToString());
+                found.PaymentSuccess = true;
+                found.Processed = true;
+                return (true, "");
+
             }catch(Exception e) {
                 return (false, e.ToString());
             }
         }
     }
 
+    class ImpodentKey {
+        public string Key { get; set; } = "";
+        public string User { get; set; } = "";
+        public bool PaymentSuccess { get; set; } = false;
+        public bool Processed { get; set; } = false;
+    }
+
 }