Add Domain project and shifted handlers to application.

2026-07-15 16:10:00 +02:00
parent 656f545281
commit 0376b58a33
16 changed files with 229 additions and 52 deletions
@@ -0,0 +1,58 @@
+using FinancialApi.Domain;
+using Wolverine.Attributes;
+using Wolverine.Persistence;
+
+namespace FinancialApi.Application;
+
+public record ApplyFeeCommand(int AccountId, decimal Amount);
+
+public record FeeAppliedEvent(int AccountId, decimal Amount);
+
+public static class ApplyFeeHandler
+{
+    public static async Task<(Account, Account)> LoadAsync(
+        ApplyFeeCommand cmd,
+        IAccountQuery query)
+    {
+        var source = await query.FindByIdAsync(cmd.AccountId);
+        var dest = await query.FindByIdAsync(99999);
+        if (source == null || dest == null)
+        {
+            throw new InvalidOperationException($"Cannot process transfer. Account(s) not found.");
+        }
+        return (source, dest);
+    }
+
+    public static (
+        IStorageAction<Account> CustomerWrite,
+        IStorageAction<Account> RevenueWrite,
+        IStorageAction<JournalEntry> JournalWrite,
+        FeeAppliedEvent Event
+        )
+        Handle(
+            ApplyFeeCommand cmd,
+            Account source,
+            Account dest
+        )
+    {
+        var updatedSource = source.ApplyPosting(cmd.Amount, EntryType.Debit);
+        var updatedRevenue = dest.ApplyPosting(cmd.Amount, EntryType.Credit);
+        var lines = new List<JournalLine>
+        {
+            new(updatedSource.Id, cmd.Amount, EntryType.Debit),
+            new(updatedRevenue.Id, cmd.Amount, EntryType.Credit)
+        };
+        var journalEntry = BalancedJournal.Create(Guid.NewGuid(),
+            $"Service Fee Applied: {cmd.Amount} to Account {cmd.AccountId}",
+            DateTimeOffset.UtcNow, lines);
+
+        var @event = new FeeAppliedEvent(cmd.AccountId, cmd.Amount);
+
+        return (
+            Storage.Update(updatedSource),
+            Storage.Update(updatedRevenue),
+            Storage.Insert(journalEntry.Entry),
+            @event
+        );
+    }
+}