// SPDX-License-Identifier: Apache-2.0
// Download a file with the browser, then read it on the gateway and save a copy here.
//
// The browser saves downloads in the user's own folder on the gateway; wp.files lists them, extracts text or rows
// (PDF, DOCX, XLSX, CSV…) and streams them; saveFile() from webpilot-si/node writes one to disk (resumable).
//
//   export WEBPILOT_URL=http://localhost:8931 WEBPILOT_TOKEN=cbu_...
//   python examples/fixture_site.py &
//   node download.ts                                              # the fixture's report.csv
//   node download.ts https://example.org/files "Annual report"    # any page and link text
import { WebPilot, type FileInfo } from "webpilot-si";
import { saveFile } from "webpilot-si/node";

const FIXTURE = process.env["WEBPILOT_FIXTURE"] ?? "http://host.docker.internal:8765";
const page = process.argv[2] ?? `${FIXTURE}/files`;
const linkText = process.argv[3] ?? "Download report";

const wp = new WebPilot();
const before = new Set((await wp.files.list().toArray()).map((f) => f.name));
const tab = await wp.open(page, { mode: "act" });
try {
  const link = (await tab.snapshot()).first(linkText, { role: "link" });
  await tab.click(link.ref);
  let file: FileInfo | undefined;
  for (let i = 0; i < 30 && !file; i++) {
    // the download finishes in the background; wait until it is listed
    file = (await wp.files.list().toArray()).find((f) => !before.has(f.name));
    if (!file) await new Promise((r) => setTimeout(r, 1000));
  }
  if (!file) throw new Error("no new file after 30 s");
  console.log(`downloaded ${file.name} (${file.size} bytes, ${file.mime})`);
  if (/\.(csv|xlsx|xls)$/i.test(file.name)) {
    let n = 0;
    for await (const row of wp.files.rows(file.name)) {
      console.log("  ", row);
      if (++n === 5) break;
    }
  } else {
    console.log((await wp.files.text(file.name)).text.slice(0, 500));
  }
  console.log("saved to", await saveFile(wp, file.name, "."));
  await wp.files.delete(file.name); // clean up on the gateway
} finally {
  await tab.close();
}