/**
 * Regenerates a single existing invoice using the offline session token,
 * downloads the resulting PDF and pretty-prints the closing/footer text so
 * we can verify the new wording end-to-end against the live dev store.
 *
 * Usage: npx tsx scripts/regenerate-invoice.ts [invoiceNumber]
 *   default invoiceNumber = RE-1001
 */
import "dotenv/config";
import { writeFileSync } from "node:fs";
import { execFileSync } from "node:child_process";
import { resolve } from "node:path";

import db from "../app/db.server";
import { unauthenticated } from "../app/shopify.server";
import { generateInvoice } from "../app/services/invoice/generateInvoice.server";

async function main() {
  const wanted = process.argv[2] ?? "RE-1001";

  const invoice = await db.invoice.findFirst({
    where: { invoiceNumber: wanted, kind: "invoice", cancelledAt: null },
    orderBy: [{ version: "desc" }, { createdAt: "desc" }],
  });
  if (!invoice) throw new Error(`No invoice ${wanted} found in DB`);

  console.log(`Found ${invoice.invoiceNumber} (status=${invoice.status}, sentAt=${invoice.sentAt ?? "—"}) for order ${invoice.orderId}`);

  const { admin } = await unauthenticated.admin(invoice.shopDomain);

  const result = await generateInvoice({
    shopDomain: invoice.shopDomain,
    admin,
    orderId: invoice.orderId,
    forceRegenerate: true,
  });

  console.log(`Regenerated → version ${result.version}, pdfUrl=${result.pdfUrl}`);

  const out = resolve(process.cwd(), "data", `regen-${result.invoiceNumber}.pdf`);
  const res = await fetch(result.pdfUrl);
  if (!res.ok) throw new Error(`download failed: ${res.status}`);
  const buf = Buffer.from(await res.arrayBuffer());
  writeFileSync(out, buf);
  console.log(`Saved ${out} (${buf.length} bytes)`);

  const text = execFileSync("pdftotext", ["-layout", "-enc", "UTF-8", out, "-"], { encoding: "utf8" });

  const okDe = text.includes("Danke für deinen Einkauf");
  const okEn = text.includes("Thank you for your purchase.");
  const oldDe = text.includes("Mit freundlichen Grüßen");
  const oldEn = /\bKind regards\b/.test(text);

  console.log(`\n--- closing text checks ---`);
  console.log(`  contains 'Danke für deinen Einkauf'  : ${okDe}`);
  console.log(`  contains 'Thank you for your purchase.': ${okEn}`);
  console.log(`  contains old 'Mit freundlichen Grüßen' : ${oldDe}`);
  console.log(`  contains old 'Kind regards'            : ${oldEn}`);

  const langOk = invoice.language === "en" ? okEn : okDe;
  const cleanOld = invoice.language === "en" ? !oldEn : !oldDe;
  if (!langOk || !cleanOld) {
    console.error(`FAIL: closing line did not match expected wording for language=${invoice.language}`);
    process.exit(1);
  }
  console.log(`PASS: regenerated ${invoice.invoiceNumber} (lang=${invoice.language}) shows the new closing.`);
}

main()
  .catch((e) => { console.error(e); process.exit(1); })
  .finally(() => db.$disconnect());