Phase7: Void/Refund logic

src/lib/credit-note-pdf.tsx

@@ -0,0 +1,553 @@
+/**
+ * Credit-note PDF rendering via @react-pdf/renderer.
+ *
+ * Phase 7. Mirrors billing-pdf.tsx in layout but with:
+ *   - Title "Gutschrift" / "Credit note" / "Note de crédit" / "Nota di credito"
+ *   - Red accent (vs invoice's emerald) so the document is visually
+ *     unmistakable from an invoice
+ *   - References the original invoice number prominently
+ *   - One amount line ("Refund for invoice 2026-00042" or
+ *     "Voided invoice 2026-00042") with VAT broken out
+ *   - Optional reason text below the amount
+ *   - No bank-transfer instructions (refunds flow the other way:
+ *     either Stripe → customer's card, or PieCed → customer's bank
+ *     for invoice-paid cases — neither requires the customer to
+ *     do anything)
+ *
+ * Issuer block and brand constants are intentionally duplicated
+ * from billing-pdf.tsx for now. A future refactor can hoist them
+ * into lib/pdf-brand.ts; doing so today is out of scope.
+ */
+
+import React from "react";
+import {
+  Document,
+  Page,
+  Text,
+  View,
+  StyleSheet,
+  Svg,
+  Polygon,
+  Polyline,
+  renderToBuffer,
+} from "@react-pdf/renderer";
+import type { CreditNote, Invoice } from "@/types";
+
+// ---------------------------------------------------------------------------
+// Brand constants — keep in sync with billing-pdf.tsx until the
+// shared brand module lands.
+// ---------------------------------------------------------------------------
+
+const BRAND = {
+  name: "PieCed IT",
+  // Red accent for credit notes — visually distinct from the invoice
+  // emerald so customers can't confuse the two at a glance.
+  primary: "#DC2626",
+  primaryDark: "#991B1B",
+  textColor: "#1a1a1a",
+  mutedColor: "#666",
+  borderColor: "#d4d4d4",
+  issuer: {
+    legalName: "PieCed IT",
+    addressLine1: "Cedric Mosimann",
+    addressLine2: "[Strasse Nr.]",
+    postalCity: "[PLZ] Basel",
+    country: "Switzerland",
+    email: "billing@pieced.ch",
+    web: "pieced.ch",
+    vatNumber: null as string | null,
+  },
+};
+
+// ---------------------------------------------------------------------------
+// Localized strings (mirrors PdfStrings in billing-pdf.tsx, adapted
+// for the credit-note context)
+// ---------------------------------------------------------------------------
+
+interface CreditNoteStrings {
+  /** Document title at the top — "Gutschrift" etc. */
+  creditNote: string;
+  /** "Credit note no." label */
+  creditNoteNumber: string;
+  /** "Issue date" label */
+  issueDate: string;
+  /** "Bill to" label, same as invoice */
+  billTo: string;
+  /** "Attn:" / "z.Hd." prefix */
+  attentionPrefix: string;
+  /** "Reference invoice" — links the credit note back to the original */
+  referenceInvoice: string;
+  /** "Reason" label for the free-text reason block */
+  reason: string;
+  /** Body text describing what this credit note is for. Takes the
+   *  invoice number as a `{number}` placeholder. */
+  voidLineLabel: string;
+  refundLineLabel: string;
+  /** Totals labels — same words as invoice but separated for clarity */
+  subtotal: string;
+  vatLabel: string;
+  totalCredited: string;
+  /** Footer note explaining the document */
+  footerVoidNote: string;
+  footerRefundNote: string;
+  /** VAT note (reverse-charge or normal) — same logic as invoice */
+  vatNoteSwiss: string;
+  vatNoteReverseCharge: string;
+  vatNoteOutOfScope: string;
+}
+
+const MESSAGES: Record<string, CreditNoteStrings> = {
+  de: {
+    creditNote: "Gutschrift",
+    creditNoteNumber: "Gutschrift-Nr.",
+    issueDate: "Ausstellungsdatum",
+    billTo: "Empfänger",
+    attentionPrefix: "z.Hd.",
+    referenceInvoice: "Bezug Rechnung",
+    reason: "Begründung",
+    voidLineLabel: "Stornierung Rechnung {number}",
+    refundLineLabel: "Rückerstattung Rechnung {number}",
+    subtotal: "Zwischensumme",
+    vatLabel: "MWST",
+    totalCredited: "Gesamtbetrag Gutschrift",
+    footerVoidNote:
+      "Diese Gutschrift storniert die oben referenzierte Rechnung. Ein Zahlungsausgleich ist nicht erforderlich.",
+    footerRefundNote:
+      "Diese Gutschrift dokumentiert die Rückerstattung des oben genannten Betrags. Die Auszahlung erfolgt über den ursprünglichen Zahlungsweg.",
+    vatNoteSwiss:
+      "MWST gemäss schweizerischem Mehrwertsteuergesetz (MWSTG).",
+    vatNoteReverseCharge:
+      "Reverse Charge: Steuerschuldnerschaft des Leistungsempfängers nach Art. 196 EU-MwStSyst-RL bzw. nationaler Umsetzung.",
+    vatNoteOutOfScope:
+      "Leistung ausserhalb des Geltungsbereichs der schweizerischen MWST.",
+  },
+  en: {
+    creditNote: "Credit note",
+    creditNoteNumber: "Credit note no.",
+    issueDate: "Issue date",
+    billTo: "Bill to",
+    attentionPrefix: "Attn:",
+    referenceInvoice: "Reference invoice",
+    reason: "Reason",
+    voidLineLabel: "Void of invoice {number}",
+    refundLineLabel: "Refund for invoice {number}",
+    subtotal: "Subtotal",
+    vatLabel: "VAT",
+    totalCredited: "Total credited",
+    footerVoidNote:
+      "This credit note voids the referenced invoice. No payment is required.",
+    footerRefundNote:
+      "This credit note documents the refund of the amount above. Settlement occurs via the original payment method.",
+    vatNoteSwiss:
+      "VAT charged in accordance with Swiss VAT law (MWSTG).",
+    vatNoteReverseCharge:
+      "Reverse charge: VAT to be accounted for by the recipient per Art. 196 EU VAT Directive or national implementation.",
+    vatNoteOutOfScope:
+      "Service supplied outside the scope of Swiss VAT.",
+  },
+  fr: {
+    creditNote: "Note de crédit",
+    creditNoteNumber: "N° de note de crédit",
+    issueDate: "Date d'émission",
+    billTo: "Destinataire",
+    attentionPrefix: "À l'attention de",
+    referenceInvoice: "Facture de référence",
+    reason: "Motif",
+    voidLineLabel: "Annulation de la facture {number}",
+    refundLineLabel: "Remboursement de la facture {number}",
+    subtotal: "Sous-total",
+    vatLabel: "TVA",
+    totalCredited: "Total du crédit",
+    footerVoidNote:
+      "Cette note de crédit annule la facture référencée ci-dessus. Aucun paiement n'est requis.",
+    footerRefundNote:
+      "Cette note de crédit documente le remboursement du montant ci-dessus. Le règlement s'effectue via le moyen de paiement initial.",
+    vatNoteSwiss:
+      "TVA facturée conformément à la loi suisse sur la TVA (LTVA).",
+    vatNoteReverseCharge:
+      "Autoliquidation : TVA à acquitter par le destinataire selon l'art. 196 de la directive TVA UE ou sa mise en œuvre nationale.",
+    vatNoteOutOfScope:
+      "Prestation hors du champ d'application de la TVA suisse.",
+  },
+  it: {
+    creditNote: "Nota di credito",
+    creditNoteNumber: "N. nota di credito",
+    issueDate: "Data di emissione",
+    billTo: "Destinatario",
+    attentionPrefix: "c.a.",
+    referenceInvoice: "Fattura di riferimento",
+    reason: "Motivo",
+    voidLineLabel: "Annullamento della fattura {number}",
+    refundLineLabel: "Rimborso della fattura {number}",
+    subtotal: "Subtotale",
+    vatLabel: "IVA",
+    totalCredited: "Totale accreditato",
+    footerVoidNote:
+      "Questa nota di credito annulla la fattura sopra indicata. Non è richiesto alcun pagamento.",
+    footerRefundNote:
+      "Questa nota di credito documenta il rimborso dell'importo sopra indicato. Il regolamento avviene tramite il metodo di pagamento originale.",
+    vatNoteSwiss:
+      "IVA addebitata in conformità alla legge svizzera sull'IVA (LIVA).",
+    vatNoteReverseCharge:
+      "Inversione contabile: IVA dovuta dal destinatario ai sensi dell'art. 196 della direttiva IVA UE o della sua attuazione nazionale.",
+    vatNoteOutOfScope:
+      "Prestazione fuori dal campo di applicazione dell'IVA svizzera.",
+  },
+};
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function pickStrings(locale: string): CreditNoteStrings {
+  return MESSAGES[locale] ?? MESSAGES.de;
+}
+
+function fmtChf(n: number): string {
+  return n.toLocaleString("de-CH", {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2,
+  });
+}
+
+function fmtDate(iso: string, locale: string): string {
+  const d = new Date(iso);
+  const localeMap: Record<string, string> = {
+    de: "de-CH",
+    en: "en-GB",
+    fr: "fr-CH",
+    it: "it-CH",
+  };
+  return d.toLocaleDateString(localeMap[locale] ?? "de-CH", {
+    year: "numeric",
+    month: "long",
+    day: "numeric",
+  });
+}
+
+function pickVatNote(
+  invoice: Invoice,
+  strings: CreditNoteStrings
+): string | null {
+  // Mirror the invoice's VAT note logic — the credit note's VAT
+  // treatment must match the original invoice's, otherwise the
+  // accounting wouldn't reconcile.
+  const country = invoice.billingSnapshot.country?.toUpperCase();
+  const hasVat = invoice.billingSnapshot.vatNumber?.trim();
+  if (country === "CH" || country === "LI") {
+    return strings.vatNoteSwiss;
+  }
+  if (hasVat) {
+    return strings.vatNoteReverseCharge;
+  }
+  return strings.vatNoteOutOfScope;
+}
+
+// ---------------------------------------------------------------------------
+// Styles
+// ---------------------------------------------------------------------------
+
+const styles = StyleSheet.create({
+  page: {
+    paddingTop: 36,
+    paddingBottom: 50,
+    paddingHorizontal: 50,
+    fontSize: 10,
+    fontFamily: "Helvetica",
+    color: BRAND.textColor,
+  },
+  headerRow: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    marginBottom: 32,
+  },
+  logoBlock: { flexDirection: "row", alignItems: "center" },
+  brandName: {
+    fontSize: 16,
+    color: BRAND.primaryDark,
+    marginLeft: 8,
+    fontFamily: "Helvetica-Bold",
+  },
+  issuerBlock: { textAlign: "right", fontSize: 8.5, color: BRAND.mutedColor },
+  issuerName: { fontSize: 11, color: BRAND.primaryDark, marginBottom: 2 },
+  docTitle: {
+    fontSize: 22,
+    color: BRAND.primaryDark,
+    marginBottom: 8,
+    fontFamily: "Helvetica-Bold",
+  },
+  metaTable: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    marginBottom: 20,
+  },
+  metaCol: { flexDirection: "column", minWidth: 140 },
+  metaLabel: { fontSize: 8, color: BRAND.mutedColor, marginBottom: 2 },
+  metaValue: { fontSize: 10 },
+  billTo: {
+    marginBottom: 24,
+    padding: 8,
+    backgroundColor: "#fdf2f2",
+    borderLeftWidth: 3,
+    borderLeftColor: BRAND.primary,
+  },
+  billToLabel: { fontSize: 8, color: BRAND.mutedColor, marginBottom: 4 },
+  billToName: { fontSize: 11, marginBottom: 2 },
+  amountTable: {
+    borderTopWidth: 1,
+    borderTopColor: BRAND.borderColor,
+    borderBottomWidth: 1,
+    borderBottomColor: BRAND.borderColor,
+    marginBottom: 16,
+  },
+  amountHeader: {
+    flexDirection: "row",
+    backgroundColor: BRAND.primaryDark,
+    color: "#ffffff",
+    paddingVertical: 5,
+    paddingHorizontal: 6,
+    fontSize: 9,
+    fontFamily: "Helvetica-Bold",
+  },
+  amountRow: {
+    flexDirection: "row",
+    paddingVertical: 8,
+    paddingHorizontal: 6,
+    borderBottomWidth: 1,
+    borderBottomColor: "#f0f0f0",
+  },
+  amountDesc: { flex: 1 },
+  amountValue: { width: 90, textAlign: "right" },
+  totals: {
+    marginLeft: "auto",
+    width: 220,
+    marginBottom: 20,
+  },
+  totalsRow: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    paddingVertical: 3,
+  },
+  totalsLabel: { color: BRAND.mutedColor, fontSize: 10 },
+  totalsValue: { fontSize: 10 },
+  totalsGrand: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    borderTopWidth: 1,
+    borderTopColor: BRAND.primaryDark,
+    paddingTop: 6,
+    marginTop: 4,
+  },
+  totalsGrandLabel: {
+    color: BRAND.primaryDark,
+    fontSize: 11,
+    fontFamily: "Helvetica-Bold",
+  },
+  totalsGrandValue: {
+    color: BRAND.primaryDark,
+    fontSize: 11,
+    textAlign: "right",
+    fontFamily: "Helvetica-Bold",
+  },
+  reasonBox: {
+    marginTop: 4,
+    marginBottom: 18,
+    padding: 8,
+    backgroundColor: "#fafafa",
+    borderLeftWidth: 2,
+    borderLeftColor: BRAND.borderColor,
+  },
+  reasonLabel: {
+    fontSize: 8,
+    color: BRAND.mutedColor,
+    marginBottom: 2,
+    textTransform: "uppercase",
+    letterSpacing: 0.5,
+  },
+  reasonText: { fontSize: 9.5, color: BRAND.textColor },
+  noteBox: {
+    marginTop: 12,
+    padding: 8,
+    fontSize: 8.5,
+    color: BRAND.mutedColor,
+    lineHeight: 1.5,
+  },
+  footer: {
+    position: "absolute",
+    bottom: 24,
+    left: 50,
+    right: 50,
+    fontSize: 7.5,
+    color: BRAND.mutedColor,
+    textAlign: "center",
+    borderTopWidth: 0.5,
+    borderTopColor: BRAND.borderColor,
+    paddingTop: 6,
+  },
+});
+
+// Mini SVG logo — identical shape to billing-pdf, just recolored
+// to the credit-note red so it matches the document accent.
+function Logo() {
+  return (
+    <Svg width={26} height={26} viewBox="0 0 100 100">
+      <Polygon points="50,15 80,40 65,80 35,80 20,40" fill={BRAND.primary} />
+      <Polyline
+        points="35,80 50,60 65,80"
+        stroke="#ffffff"
+        strokeWidth={3}
+        fill="none"
+      />
+    </Svg>
+  );
+}
+
+// ---------------------------------------------------------------------------
+// Main document
+// ---------------------------------------------------------------------------
+
+interface CreditNotePdfProps {
+  creditNote: CreditNote;
+  invoice: Invoice;
+}
+
+function CreditNotePdfDocument({ creditNote, invoice }: CreditNotePdfProps) {
+  const strings = pickStrings(creditNote.locale);
+  const snap = creditNote.billingSnapshot;
+  const vatNote = pickVatNote(invoice, strings);
+  const amountLabelTemplate =
+    creditNote.kind === "void" ? strings.voidLineLabel : strings.refundLineLabel;
+  const amountLabel = amountLabelTemplate.replace("{number}", invoice.invoiceNumber);
+  const footerNote =
+    creditNote.kind === "void" ? strings.footerVoidNote : strings.footerRefundNote;
+  // Subtotal + VAT breakdown. We carry the VAT proportion from the
+  // credit note row itself (set by billing.ts based on the invoice's
+  // VAT rate × the refund/void amount).
+  const subtotal = creditNote.amountChf - creditNote.vatAmountChf;
+  return (
+    <Document>
+      <Page size="A4" style={styles.page}>
+        {/* Header: logo+brand left, issuer block right */}
+        <View style={styles.headerRow}>
+          <View style={styles.logoBlock}>
+            <Logo />
+            <Text style={styles.brandName}>{BRAND.name}</Text>
+          </View>
+          <View style={styles.issuerBlock}>
+            <Text style={styles.issuerName}>{BRAND.issuer.legalName}</Text>
+            <Text>{BRAND.issuer.addressLine1}</Text>
+            <Text>{BRAND.issuer.addressLine2}</Text>
+            <Text>{BRAND.issuer.postalCity}</Text>
+            <Text>{BRAND.issuer.country}</Text>
+            <Text>{BRAND.issuer.email}</Text>
+            <Text>{BRAND.issuer.web}</Text>
+            {BRAND.issuer.vatNumber && (
+              <Text>MWST-Nr. {BRAND.issuer.vatNumber}</Text>
+            )}
+          </View>
+        </View>
+
+        <Text style={styles.docTitle}>{strings.creditNote}</Text>
+
+        {/* Meta row: number, issue date, reference invoice */}
+        <View style={styles.metaTable}>
+          <View style={styles.metaCol}>
+            <Text style={styles.metaLabel}>{strings.creditNoteNumber}</Text>
+            <Text style={styles.metaValue}>{creditNote.creditNoteNumber}</Text>
+          </View>
+          <View style={styles.metaCol}>
+            <Text style={styles.metaLabel}>{strings.issueDate}</Text>
+            <Text style={styles.metaValue}>
+              {fmtDate(creditNote.issuedAt, creditNote.locale)}
+            </Text>
+          </View>
+          <View style={styles.metaCol}>
+            <Text style={styles.metaLabel}>{strings.referenceInvoice}</Text>
+            <Text style={styles.metaValue}>{invoice.invoiceNumber}</Text>
+          </View>
+        </View>
+
+        {/* Bill-to (mirrors invoice block) */}
+        <View style={styles.billTo}>
+          <Text style={styles.billToLabel}>{strings.billTo}</Text>
+          <Text style={styles.billToName}>{snap.companyName}</Text>
+          {snap.contactName && snap.contactName.trim().length > 0 && (
+            <Text>
+              {strings.attentionPrefix} {snap.contactName}
+            </Text>
+          )}
+          <Text>{snap.streetAddress}</Text>
+          <Text>
+            {snap.postalCode} {snap.city}
+          </Text>
+          <Text>{snap.country}</Text>
+          {snap.vatNumber && <Text>MWST/VAT: {snap.vatNumber}</Text>}
+        </View>
+
+        {/* Amount line — single row, the credit note isn't itemized */}
+        <View style={styles.amountTable}>
+          <View style={styles.amountHeader}>
+            <Text style={styles.amountDesc}> </Text>
+            <Text style={styles.amountValue}>CHF</Text>
+          </View>
+          <View style={styles.amountRow}>
+            <Text style={styles.amountDesc}>{amountLabel}</Text>
+            <Text style={styles.amountValue}>{fmtChf(subtotal)}</Text>
+          </View>
+        </View>
+
+        {/* Totals */}
+        <View style={styles.totals}>
+          <View style={styles.totalsRow}>
+            <Text style={styles.totalsLabel}>{strings.subtotal}</Text>
+            <Text style={styles.totalsValue}>CHF {fmtChf(subtotal)}</Text>
+          </View>
+          {creditNote.vatAmountChf > 0 && (
+            <View style={styles.totalsRow}>
+              <Text style={styles.totalsLabel}>
+                {strings.vatLabel} ({Number(invoice.vatRate).toFixed(1)}%)
+              </Text>
+              <Text style={styles.totalsValue}>
+                CHF {fmtChf(creditNote.vatAmountChf)}
+              </Text>
+            </View>
+          )}
+          <View style={styles.totalsGrand}>
+            <Text style={styles.totalsGrandLabel}>{strings.totalCredited}</Text>
+            <Text style={styles.totalsGrandValue}>
+              CHF {fmtChf(creditNote.amountChf)}
+            </Text>
+          </View>
+        </View>
+
+        {/* Reason block — only if the admin provided one */}
+        {creditNote.reason && creditNote.reason.trim().length > 0 && (
+          <View style={styles.reasonBox}>
+            <Text style={styles.reasonLabel}>{strings.reason}</Text>
+            <Text style={styles.reasonText}>{creditNote.reason}</Text>
+          </View>
+        )}
+
+        {/* Footer note explaining what this document is */}
+        <View style={styles.noteBox}>
+          <Text>{footerNote}</Text>
+          {vatNote && <Text style={{ marginTop: 6 }}>{vatNote}</Text>}
+        </View>
+
+        {/* Tiny footer with credit-note number on every page */}
+        <Text style={styles.footer} fixed>
+          {BRAND.issuer.legalName} · {creditNote.creditNoteNumber}
+        </Text>
+      </Page>
+    </Document>
+  );
+}
+
+export async function renderCreditNotePdf(
+  creditNote: CreditNote,
+  invoice: Invoice
+): Promise<Buffer> {
+  const doc = <CreditNotePdfDocument creditNote={creditNote} invoice={invoice} />;
+  // @react-pdf/renderer's renderToBuffer returns a Node Buffer.
+  return renderToBuffer(doc) as unknown as Buffer;
+}