feat: add buildCsv for cashbox export

myteamwallet_backend/src/cashbox-export/cashbox-export.utils.spec.ts

@@ -1,4 +1,4 @@
-import { buildRows } from './cashbox-export.utils';
+import { buildCsv, buildRows } from './cashbox-export.utils';
 
 describe('buildRows', () => {
   const team = (overrides: Partial<{ transactions: any[]; players: any[] }> = {}) => ({
@@ -101,3 +101,36 @@ describe('buildRows', () => {
     ]);
   });
 });
+
+describe('buildCsv', () => {
+  it('renders the header and formatted rows with German decimals', () => {
+    const csv = buildCsv([
+      { date: '2026-08-05T00:00:00.000Z', type: 'payment', who: 'Alex Muster', note: 'Bar bezahlt', amount: 10, runningTotal: 10 },
+      { date: '2026-08-10T00:00:00.000Z', type: 'expense', who: 'Teamkasse', note: 'Bälle', amount: -20.5, runningTotal: -10.5 },
+    ]);
+
+    expect(csv).toBe(
+      'Datum;Typ;Wer;Notiz;Betrag;Periodensaldo\r\n' +
+        '2026-08-05;Zahlung;Alex Muster;Bar bezahlt;10,00;10,00\r\n' +
+        '2026-08-10;Ausgabe;Teamkasse;Bälle;-20,50;-10,50',
+    );
+  });
+
+  it('quotes notes containing a semicolon and escapes embedded quotes', () => {
+    const csv = buildCsv([
+      { date: '2026-08-05T00:00:00.000Z', type: 'credit', who: 'Teamkasse', note: 'Spende; "danke"', amount: 5, runningTotal: 5 },
+    ]);
+
+    expect(csv).toBe(
+      'Datum;Typ;Wer;Notiz;Betrag;Periodensaldo\r\n' +
+        '2026-08-05;Guthaben;Teamkasse;"Spende; ""danke""";5,00;5,00',
+    );
+  });
+
+  it('shows a placeholder row when there are no bookings', () => {
+    const csv = buildCsv([]);
+    expect(csv).toBe(
+      'Datum;Typ;Wer;Notiz;Betrag;Periodensaldo\r\nKeine Buchungen im gewählten Zeitraum',
+    );
+  });
+});

myteamwallet_backend/src/cashbox-export/cashbox-export.utils.ts

@@ -60,3 +60,41 @@ export function buildRows(team: Team, from: string, to: string): CashboxExportRo
     return { ...row, runningTotal };
   });
 }
+
+const TYPE_LABELS: Record<string, string> = {
+  payment: 'Zahlung',
+  credit: 'Guthaben',
+  expense: 'Ausgabe',
+};
+
+function formatGermanAmount(value: number): string {
+  return value.toFixed(2).replace('.', ',');
+}
+
+function escapeCsvField(value: string): string {
+  if (/[;"\n\r]/.test(value)) {
+    return `"${value.replace(/"/g, '""')}"`;
+  }
+  return value;
+}
+
+export function buildCsv(rows: CashboxExportRow[]): string {
+  const lines = ['Datum;Typ;Wer;Notiz;Betrag;Periodensaldo'];
+  if (rows.length === 0) {
+    lines.push('Keine Buchungen im gewählten Zeitraum');
+  } else {
+    for (const row of rows) {
+      lines.push(
+        [
+          row.date.slice(0, 10),
+          TYPE_LABELS[row.type] ?? row.type,
+          escapeCsvField(row.who),
+          escapeCsvField(row.note),
+          formatGermanAmount(row.amount),
+          formatGermanAmount(row.runningTotal),
+        ].join(';'),
+      );
+    }
+  }
+  return lines.join('\r\n');
+}