import { pdf } from "@react-pdf/renderer";
import { QuoteDocument, type QuoteDocumentProps } from "./quote-document";

/**
 * Server-side render of a `<QuoteDocument>` to a PDF Buffer.
 *
 * Uses `@react-pdf/renderer`'s Node API (`pdf(<JSX />).toBuffer()`) which
 * runs entirely in-process — no headless Chromium, no Playwright/Puppeteer,
 * no browser binary in the Docker image.
 *
 * Always returns a fresh Buffer; never cached. Reads of letterhead,
 * quote, items, and customer happen in the API route before this is
 * called, so any edit in PB propagates on the next generation.
 */
export async function renderQuotePdf(props: QuoteDocumentProps): Promise<Buffer> {
  const instance = pdf(<QuoteDocument {...props} />);
  // `toBuffer()` works in pure Node, but under jsdom (Vitest's default
  // test environment) it returns a PDFKit document handle instead. We
  // funnel through `toString()` which always resolves to a string of
  // raw PDF bytes, then convert to a real Node Buffer. The string path
  // is ~the same performance as toBuffer in production.
  const pdfString = await instance.toString();
  return Buffer.from(pdfString, "binary");
}