/**
 * Writes the Owliver behaviour baseline.
 *
 *   node scripts/owliver-baseline.mjs            # report drift, write nothing
 *   node scripts/owliver-baseline.mjs --write    # (re)generate the snapshot
 *
 * The snapshot is the existing product's behaviour, recorded before the Agent
 * layer was built and asserted by `skill-check.mjs` on every run afterwards.
 *
 * Regenerating is a deliberate act with a reason attached. A baseline rewritten
 * to make a red check go green records the regression instead of catching it,
 * which is worse than having no baseline at all — it converts a caught bug into
 * a documented one.
 */
import { readFileSync, writeFileSync, existsSync, mkdirSync } from 'node:fs';
import { dirname } from 'node:path';
import { createServer } from 'vite';
import { BASELINE_PATH, captureBaseline } from './owliver-capture.mjs';
import { withSourceResolution } from './ssr-resolve.mjs';

const ROOT = process.cwd();

const server = await createServer({
  root: ROOT,
  server: { middlewareMode: true },
  appType: 'custom',
  logLevel: 'error',
});

/* Resolves the capture's module paths whatever extension they carry during the
   TypeScript migration. The comparison this script performs is unaffected: it
   loads the same modules and serialises the same values. */
withSourceResolution(server, ROOT);

const captured = await captureBaseline(server);
await server.close();

const serialized = `${JSON.stringify(captured, null, 2)}\n`;

if (process.argv.includes('--write')) {
  mkdirSync(dirname(BASELINE_PATH), { recursive: true });
  writeFileSync(BASELINE_PATH, serialized);
  const pages = Object.keys(captured.contexts).length;
  console.log(`Baseline written — ${pages} contexts, ${captured.skillIds.length} skills, ${Object.keys(captured.routes).length} routes.`);
  process.exit(0);
}

if (!existsSync(BASELINE_PATH)) {
  console.error('No baseline recorded. Run `node scripts/owliver-baseline.mjs --write`.');
  process.exit(1);
}

if (readFileSync(BASELINE_PATH, 'utf8') === serialized) {
  console.log('Owliver behaviour matches the baseline.');
  process.exit(0);
}

console.error('Owliver behaviour has DRIFTED from the baseline. Run `npm test` for the per-page detail.');
process.exit(1);