IO format fixes and implemented res payment

This is a small commit to include the feature for paying for a
reservation, specifically only the 60-day-in-advance reservation type as
the others are paid for at specific periods. Other fixes include just
some formatting for reports.

OpheliasOasis/Models/Transaction.cs

@@ -107,11 +107,19 @@ namespace Ophelias.Models
             cmd.Parameters.AddWithValue("@PayBy", this.PayBy.ToString("yyyy-MM-dd"));
             cmd.ExecuteNonQuery();
         }
-        internal void Pay(double Amount)
+        internal PaymentStatus Pay(double Amount, string cc)
         {
+            if (string.IsNullOrEmpty(cc))
+            {
+                return PaymentStatus.MissingCreditCard;
+            }
+            if (Amount >= Owed)
+            {
+                return PaymentStatus.AlreadyPaid;
+            }
             if (Amount <= 0)
             {
-                return;
+                return PaymentStatus.AmountCannotZero;
             }
 
             LastPaid = DateTime.Now;
@@ -144,6 +152,7 @@ namespace Ophelias.Models
                 throw new Exception();
             cmd.Parameters.AddWithValue("@PaidOn", PaidOn.Value.ToString("yyyy-MM-dd"));
             cmd.ExecuteNonQuery();
+            return PaymentStatus.SuccessfulPayment;
         }
         internal void Refund()
         {
@@ -200,13 +209,12 @@ namespace Ophelias.Models
 
 
     }
-    internal class TransactionList
+    internal enum PaymentStatus
     {
-        internal List<Transaction> Transactions;
-
-        internal TransactionList()
-        {
-            Transactions = new();
-        }
+        SuccessfulPayment,
+        AlreadyPaid,
+        FailedPayment,
+        AmountCannotZero,
+        MissingCreditCard
     }
 }