// SPDX-License-Identifier: MIT
// Synthetic test documents only. Requires pdf-lib and Poppler.
import { PDFDocument, StandardFonts, rgb } from "pdf-lib";
import { execFileSync } from "node:child_process";
import { mkdir, readFile, writeFile } from "node:fs/promises";
import { resolve } from "node:path";
import { createHash } from "node:crypto";

const directory = resolve(process.env.PDF_STUDY_DIR || "public/research/scanned-pdf-fillers/2026-09-29");
await mkdir(directory, { recursive: true });
const pdf = await PDFDocument.create();
pdf.setTitle("Synthetic PDF filling benchmark form");
pdf.setAuthor("Rust Solutions Ltd — synthetic research fixture");
pdf.setCreationDate(new Date("2026-09-29T00:00:00Z"));
pdf.setModificationDate(new Date("2026-09-29T00:00:00Z"));
const font = await pdf.embedFont(StandardFonts.Helvetica);
const page = pdf.addPage([600, 480]);
const ink = rgb(.12, .18, .16);
for (const [text, x, y, size] of [
  ["PDF filling test — fictional answers only", 40, 425, 20],
  ["This is not an application. There are no interactive form fields.", 40, 392, 12],
  ["Name", 40, 310, 16], ["Date", 40, 240, 16],
  ["STUDY-DOCUMENT-MARKER-20260929", 40, 65, 11],
  ["Same page artwork in the flat and image-only test documents.", 40, 40, 11]
]) page.drawText(text, { x, y, size, font, color: ink });
for (const y of [304, 234]) page.drawLine({ start: { x: 145, y }, end: { x: 552, y }, thickness: 1, color: ink });
const flatPath = resolve(directory, "flat-form.pdf");
await writeFile(flatPath, await pdf.save({ useObjectStreams: false }));
execFileSync("pdftoppm", ["-singlefile", "-scale-to", "1500", "-png", flatPath, resolve(directory, "fixture-artwork")], { timeout: 15000 });
const scan = await PDFDocument.create();
scan.setTitle("Image-only PDF filling benchmark form");
scan.setCreationDate(new Date("2026-09-29T00:00:00Z"));
scan.setModificationDate(new Date("2026-09-29T00:00:00Z"));
const image = await scan.embedPng(await readFile(resolve(directory, "fixture-artwork.png")));
scan.addPage([600, 480]).drawImage(image, { x: 0, y: 0, width: 600, height: 480 });
const scannedPath = resolve(directory, "image-only-form.pdf");
await writeFile(scannedPath, await scan.save({ useObjectStreams: false }));
if (execFileSync("pdftotext", [scannedPath, "-"], { encoding: "utf8" }).trim()) throw new Error("The image-only fixture must have no text layer");
const manifest = [];
for (const [id, path] of [["flat", flatPath], ["scan", scannedPath]]) {
  const bytes = await readFile(path);
  const loaded = await PDFDocument.load(bytes);
  if (loaded.getForm().getFields().length) throw new Error("Fixtures must have no interactive fields");
  manifest.push({ id, file: path.split("/").at(-1), sha256: createHash("sha256").update(bytes).digest("hex"), bytes: bytes.length, pages: loaded.getPageCount(), pageSize: [600, 480], extractableSourceText: id === "flat", answer: "Alex Example" });
}
await writeFile(resolve(directory, "fixtures.json"), JSON.stringify(manifest, null, 2) + "\n");
console.log(JSON.stringify({ directory, manifest }, null, 2));