Phase3: Billing Customerpage/Mailings

src/lib/billing.ts

@@ -61,6 +61,7 @@ import { listTenants } from "./k8s";
 import { getTeamSpendLogsV2 } from "./litellm";
 import { getUsage as getThreemaUsage } from "./threema-relay";
 import { renderInvoicePdf } from "./billing-pdf";
+import { sendInvoiceIssuedEmail } from "./email";
 import { formatLineDescription } from "./billing-i18n";
 
 // ---------------------------------------------------------------------------
@@ -779,6 +780,50 @@ export async function generateInvoice(opts: {
     // Pass 2: store the PDF bytes.
     await updateInvoicePdf(placeholder.id, pdfBuffer, filename);
     const finalInvoice = await getInvoiceById(placeholder.id);
+
+    // Phase 3: best-effort notification to the billing contact.
+    // We send AFTER the PDF is fully persisted (so the deep link
+    // in the email immediately resolves to a downloadable PDF) but
+    // BEFORE returning, since the cron caller doesn't otherwise
+    // know to trigger this. Failure is logged, never thrown — a
+    // mail-server hiccup must not roll back an issued invoice.
+    // The recipient is the billing email captured in the invoice
+    // snapshot (immutable; reflects who was on file at issue time).
+    try {
+      const settled = finalInvoice ?? placeholder;
+      const snapshot = settled.billingSnapshot;
+      if (snapshot.billingEmail) {
+        const supportedLocales: Array<"en" | "de" | "fr" | "it"> = [
+          "en", "de", "fr", "it",
+        ];
+        const locale = supportedLocales.includes(settled.locale as any)
+          ? (settled.locale as "en" | "de" | "fr" | "it")
+          : "de";
+        await sendInvoiceIssuedEmail({
+          to: snapshot.billingEmail,
+          contactName: snapshot.companyName, // no separate contact-name field
+          companyName: snapshot.companyName,
+          invoiceNumber: settled.invoiceNumber,
+          totalChf: settled.totalChf,
+          currency: "CHF",
+          dueAt: settled.dueAt,
+          lineCount: draft.lines.length,
+          periodStart: settled.periodStart,
+          periodEnd: settled.periodEnd,
+          locale,
+        });
+      } else {
+        console.warn(
+          `Invoice ${settled.invoiceNumber} issued but billing snapshot has no email — notification skipped.`
+        );
+      }
+    } catch (e) {
+      console.error(
+        `Invoice ${placeholder.invoiceNumber} issued; notification email failed:`,
+        e
+      );
+    }
+
     return { draft, invoice: finalInvoice ?? placeholder };
   } catch (e) {
     // Render failed — leave the persisted row in place so admin can