#!/usr/bin/env node
/**
 * Drift guard: the site's generated catalog MUST match the API source.
 *
 * Run in CI / pre-deploy. Regenerates the catalog into memory from
 * api/src/service-catalog.ts and compares it to the committed
 * site/src/lib/service-catalog.generated.ts. Fails (exit 1) on any difference,
 * so a price edited in the API but not regenerated, or the generated file
 * hand-edited, is caught before it reaches customers.
 *
 * Usage: node scripts/check-service-catalog-drift.mjs
 */
import { readFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = resolve(__dirname, "..");
const GEN = resolve(ROOT, "site/src/lib/service-catalog.generated.ts");

// Regenerate to a temp string by invoking the generator's parse logic inline.
const SRC = resolve(ROOT, "api/src/service-catalog.ts");
const tsSource = readFileSync(SRC, "utf8");
const m = tsSource.match(/export const COMPLIANCE_SERVICES[^=]*=\s*(\{[\s\S]*?\n\});/);
if (!m) { console.error("drift-check: cannot parse API catalog"); process.exit(1); }
const apiCatalog = Function(`"use strict"; return (${m[1]});`)();

// Parse the committed generated file's SERVICE_META.
const genSource = readFileSync(GEN, "utf8");
const gm = genSource.match(/export const SERVICE_META[^=]*=\s*(\{[\s\S]*?\n\});/);
if (!gm) { console.error("drift-check: cannot parse generated SERVICE_META"); process.exit(1); }
const gen = Function(`"use strict"; return (${gm[1]});`)();

let problems = [];
for (const slug of Object.keys(apiCatalog)) {
  const a = apiCatalog[slug];
  const g = gen[slug];
  if (!g) { problems.push(`${slug}: missing from generated file`); continue; }
  if (a.price_cents !== g.price_cents) problems.push(`${slug}: price API=${a.price_cents} generated=${g.price_cents}`);
  if (a.name !== g.name) problems.push(`${slug}: name mismatch`);
  if ((a.gov_fee_label || undefined) !== (g.gov_fee_label || undefined)) problems.push(`${slug}: gov_fee_label mismatch`);
}
for (const slug of Object.keys(gen)) {
  if (!apiCatalog[slug]) problems.push(`${slug}: in generated file but not in API`);
}

if (problems.length) {
  console.error("SERVICE CATALOG DRIFT DETECTED (run: node scripts/gen-service-catalog.mjs):");
  for (const p of problems) console.error("  - " + p);
  process.exit(1);
}
console.log(`drift-check: OK -- ${Object.keys(apiCatalog).length} services, API and generated catalog match.`);