add fp2 sample

2026-04-22 15:07:54 +01:00
parent f99a6e9fc7
commit 212684ccca
7 changed files with 179 additions and 0 deletions
@@ -0,0 +1,46 @@
+using CsharpFp2.Domain;
+using CsharpFp2.Infrastructure;
+
+namespace CsharpFp2.Application;
+
+// delegate type is optional, but nice to illustrate
+public delegate WithdrawResult WithdrawMoney(Guid accountId, decimal amount);
+
+public static class AccountApplication
+{
+    public static WithdrawMoney CreateWithdrawMoney(
+        LoadAccount loadAccount,
+        SaveAccount saveAccount
+    )
+    {
+        return (accountId, amount) =>
+        {
+            var account =
+                loadAccount(accountId) ?? throw new InvalidOperationException("Account not found.");
+
+            Console.WriteLine(
+                $"[App] Account loaded. Current balance: {account.Balance.Amount:0.00}"
+            );
+            Console.WriteLine($"[App] Executing withdrawal of {amount:0.00}...");
+
+            switch (AccountDomain.Withdraw(account, new Money(amount)))
+            {
+                case WithdrawResult.Success s:
+                {
+                    Console.WriteLine(
+                        $"[App] Withdrawal applied. New balance: {s.Account.Balance.Amount:0.00}"
+                    );
+                    saveAccount(s.Account);
+                    Console.WriteLine("[App] Account persisted.");
+                    return s;
+                }
+
+                case var other:
+                {
+                    Console.Error.WriteLine($"[App Error] Withdrawal failed. Error: {other}");
+                    return other;
+                }
+            }
+        };
+    }
+}