ADD: added e-rechnung

app/routes/api.invoices.$id.xml.ts

@@ -0,0 +1,156 @@
+import { getApiUser } from "@/session.server";
+import prisma from "@/lib/prisma.server";
+
+const UNIT_C62 = "C62" as const;
+const UNIT_HUR = "HUR" as const;
+const UNIT_DAY = "DAY" as const;
+const UNIT_MON = "MON" as const;
+const UNIT_ANN = "ANN" as const;
+const UNIT_KMT = "KMT" as const;
+type UnitCode = typeof UNIT_C62 | typeof UNIT_HUR | typeof UNIT_DAY | typeof UNIT_MON | typeof UNIT_ANN | typeof UNIT_KMT;
+
+function toUnitCode(unit: string | null | undefined): UnitCode {
+  if (!unit) return UNIT_C62;
+  const u = unit.toLowerCase().trim();
+  if (u === "stunde" || u === "stunden" || u === "h" || u === "std" || u === "hour") return UNIT_HUR;
+  if (u === "tag" || u === "tage" || u === "day" || u === "days") return UNIT_DAY;
+  if (u === "monat" || u === "monate" || u === "month") return UNIT_MON;
+  if (u === "jahr" || u === "jahre" || u === "year") return UNIT_ANN;
+  if (u === "km") return UNIT_KMT;
+  return UNIT_C62;
+}
+
+export async function loader({ request, params }: { request: Request; params: { id: string } }) {
+  const user = await getApiUser(request);
+  if (!user) return Response.json({ error: "Unauthorized" }, { status: 401 });
+
+  const invoice = await prisma.invoice.findFirst({
+    where: { id: params.id, company: { userId: user.id } },
+    include: {
+      items: { orderBy: { position: "asc" } },
+      customer: true,
+      company: true,
+    },
+  });
+
+  if (!invoice) return Response.json({ error: "Not found" }, { status: 404 });
+
+  const { zugferd } = await import("node-zugferd");
+  const { EN16931 } = await import("node-zugferd/profile");
+
+  const z = zugferd({ profile: EN16931, strict: false });
+
+  const isKleinunternehmer = invoice.kleinunternehmer;
+  const netTotal = Number(invoice.netTotal);
+  const taxTotal = Number(invoice.taxTotal);
+  const grossTotal = Number(invoice.grossTotal);
+
+  // Group taxes by rate for vatBreakdown
+  const taxGroups: Record<number, { basis: number; tax: number }> = {};
+  for (const item of invoice.items) {
+    const rate = Number(item.taxRate);
+    if (!taxGroups[rate]) taxGroups[rate] = { basis: 0, tax: 0 };
+    taxGroups[rate].basis += Number(item.netAmount);
+    taxGroups[rate].tax += Number(item.taxAmount);
+  }
+
+  const vatBreakdown = isKleinunternehmer
+    ? [
+        {
+          calculatedAmount: 0,
+          typeCode: "VAT",
+          basisAmount: netTotal,
+          categoryCode: "E" as const,
+          rateApplicablePercent: 0,
+          exemptionReasonText: "Steuerbefreiung gemäß §19 Abs. 1 UStG",
+        },
+      ]
+    : Object.entries(taxGroups).map(([rate, { basis, tax }]) => ({
+        calculatedAmount: tax,
+        typeCode: "VAT",
+        basisAmount: basis,
+        categoryCode: "S" as const,
+        rateApplicablePercent: Number(rate),
+      }));
+
+  const lines = invoice.items.map((item) => ({
+    tradeProduct: { name: item.description },
+    tradeDelivery: {
+      billedQuantity: {
+        amount: Number(item.quantity),
+        unitMeasureCode: toUnitCode(item.unit),
+      },
+    },
+    tradeAgreement: {
+      netTradePrice: { chargeAmount: Number(item.unitPrice) },
+    },
+    tradeSettlement: {
+      tradeTax: {
+        typeCode: "VAT",
+        categoryCode: (isKleinunternehmer ? "E" : "S") as "E" | "S",
+        rateApplicablePercent: isKleinunternehmer ? 0 : Number(item.taxRate),
+      },
+      monetarySummation: { lineTotalAmount: Number(item.netAmount) },
+    },
+  }));
+
+  const doc = z.create({
+    number: invoice.number ?? invoice.id,
+    typeCode: "380",
+    issueDate: invoice.issueDate,
+    transaction: {
+      tradeAgreement: {
+        seller: {
+          name: invoice.company.name,
+          postalAddress: {
+            ...(invoice.company.zip ? { postCode: invoice.company.zip } : {}),
+            ...(invoice.company.address ? { line1: invoice.company.address } : {}),
+            ...(invoice.company.city ? { city: invoice.company.city } : {}),
+            countryCode: "DE",
+          },
+          taxRegistration: {
+            ...(invoice.company.vatId ? { vatIdentifier: invoice.company.vatId } : {}),
+            ...(invoice.company.taxId ? { localIdentifier: invoice.company.taxId } : {}),
+          },
+        },
+        buyer: {
+          name: invoice.customer.name,
+          postalAddress: {
+            ...(invoice.customer.zip ? { postCode: invoice.customer.zip } : {}),
+            ...(invoice.customer.address ? { line1: invoice.customer.address } : {}),
+            ...(invoice.customer.city ? { city: invoice.customer.city } : {}),
+            countryCode: "DE",
+          },
+        },
+      },
+      tradeDelivery: {
+        ...(invoice.deliveryDate
+          ? { information: { deliveryDate: invoice.deliveryDate } }
+          : {}),
+      },
+      tradeSettlement: {
+        currencyCode: "EUR",
+        paymentTerms: { dueDate: invoice.dueDate },
+        vatBreakdown,
+        monetarySummation: {
+          lineTotalAmount: netTotal,
+          taxBasisTotalAmount: netTotal,
+          taxTotal: { amount: taxTotal, currencyCode: "EUR" as const },
+          grandTotalAmount: grossTotal,
+          duePayableAmount: grossTotal,
+        },
+      },
+      line: lines,
+    },
+  });
+
+  const xml = await doc.toXML();
+
+  return new Response(xml as string, {
+    status: 200,
+    headers: {
+      "Content-Type": "application/xml; charset=utf-8",
+      "Content-Disposition": `attachment; filename="rechnung-${invoice.number ?? invoice.id}.xml"`,
+    },
+  });
+}