import { InvoiceService } from "@e-invoice-eu/core";
import { renderInvoicePdf, type InvoiceOrder } from "../invoicePdf";
import { renderCorrectionInvoicePdf, type CorrectionInvoiceKind, type CorrectionInvoiceOrder } from "../correctionInvoicePdf";
import type { InvoiceSeller } from "../seller";
import { buildEInvoiceData, buildCorrectionEInvoiceData } from "./buildEInvoiceData";

// `console` satisfies @e-invoice-eu/core's minimal Logger interface
// (debug/info/warn/error) without needing a dedicated logger dependency —
// this only ever runs server-side (Node.js), console output lands in the
// same place `payload.logger`/plain `console.error` calls already do
// elsewhere in both consuming repos.
const invoiceService = new InvoiceService(console);

// Renders the existing @react-pdf/renderer visual PDF unchanged, then
// passes that buffer through @e-invoice-eu/core's Factur-X embed step to
// get back a PDF/A-3 file with the EN16931 XML attached (`factur-x.xml`)
// — same visual document a human opens, but AP software that understands
// Factur-X/ZUGFeRD can also extract and process it automatically. Format
// 'Factur-X-EN16931' — the "Comfort" profile, the minimum EN16931-compliant
// Factur-X level (see this package's README/the project's e-invoicing
// migration plan for why EN16931 over a lower profile like BASIC).
export async function renderInvoiceEInvoice(order: InvoiceOrder, seller: InvoiceSeller): Promise<Uint8Array> {
  const pdf = await renderInvoicePdf(order, seller);
  const invoiceData = buildEInvoiceData(order, seller);
  const result = await invoiceService.generate(invoiceData, {
    format: "Factur-X-EN16931",
    lang: "de",
    pdf: { buffer: pdf, filename: `Rechnung-${order.invoiceNumber}.pdf`, mimetype: "application/pdf" },
  });
  // Factur-X formats always return the PDF/A-3 bytes, never the bare XML
  // string variant `generate()`'s return type also allows for XML-only
  // formats (XRechnung/UBL/CII) — this function only ever requests a
  // Factur-X format, so this case is unreachable in practice, just
  // satisfying the union type.
  if (typeof result === "string") throw new Error("Expected a PDF/A-3 buffer from Factur-X generation, got a string.");
  return result;
}

export async function renderCorrectionInvoiceEInvoice(kind: CorrectionInvoiceKind, order: CorrectionInvoiceOrder, seller: InvoiceSeller): Promise<Uint8Array> {
  const pdf = await renderCorrectionInvoicePdf(kind, order, seller);
  const invoiceData = buildCorrectionEInvoiceData(kind, order, seller);
  const result = await invoiceService.generate(invoiceData, {
    format: "Factur-X-EN16931",
    lang: "de",
    pdf: { buffer: pdf, filename: `${kind === "storno" ? "Stornorechnung" : "Gutschrift"}-${order.correctionInvoiceNumber}.pdf`, mimetype: "application/pdf" },
  });
  if (typeof result === "string") throw new Error("Expected a PDF/A-3 buffer from Factur-X generation, got a string.");
  return result;
}