Adding journal entries and database tables. Increased starting balances.

wolverine/a-frame-architecture/FinancialApi.Application/Account.cs

@@ -1,14 +1,40 @@
 namespace FinancialApi.Application;
 
-public record Account(int Id, decimal Balance)
+public record Account(int Id, decimal Balance, string AccountType)
 {
+    public Account ApplyPosting(decimal amount, EntryType entryType)
+    {
+        if (amount <= 0)
+        {
+            throw new ArgumentException("Credit amount must be positive.");
+        }
+
+        var newBalance = Balance;
+        if (AccountType == "Revenue")
+        {
+            newBalance = entryType == EntryType.Credit ? newBalance + amount : newBalance - amount;
+        }
+        else
+        {
+            newBalance = entryType == EntryType.Debit ? newBalance - amount : newBalance + amount;
+        }
+        
+
+        if (newBalance < 0 && AccountType == "Liability")
+        {
+            throw new InvalidOperationException("Insufficient funds.");
+        }
+
+        return this with { Balance = newBalance };
+    }
+
     public Account ApplyFee(decimal amount)
     {
         if (amount <= 0)
         {
             throw new ArgumentException("Fee must be positive.");
         }
-            
+
         if (Balance - amount < 0)
         {
             throw new InvalidOperationException("Insufficient funds.");
@@ -16,18 +42,19 @@ public record Account(int Id, decimal Balance)
 
         return this with { Balance = Balance - amount };
     }
-    
+
     public Account Debit(decimal amount)
     {
         if (amount <= 0)
         {
             throw new ArgumentException("Debit amount must be positive.");
         }
+
         if (Balance - amount < 0)
         {
             throw new InvalidOperationException("Insufficient funds.");
         }
-        
+
         return this with { Balance = Balance - amount };
     }
 
@@ -37,7 +64,7 @@ public record Account(int Id, decimal Balance)
         {
             throw new ArgumentException("Credit amount must be positive.");
         }
-        
+
         return this with { Balance = Balance + amount };
     }
 }