// tests/uat/spike-diagnose-offscreen-target.ts — Plan-04-04 debug
// session-2 disambiguation helper.
//
// Single-purpose diagnostic script: launch the harness, prime the
// recording via assertA2 (so the offscreen exists with active
// MediaRecorder), then enumerate `browser.targets()` and print each
// target's `type()` + `url()`. Used to discover why the production
// offscreen target predicate in `launch.ts:registerOffscreenConsoleAttach`
// fails to match: empirical inspection of what Puppeteer actually
// reports for an MV3 offscreen document.
//
// Operation: `tsx tests/uat/spike-diagnose-offscreen-target.ts`.
// Wall-clock: ~5s (no idle, no SW kill). Exits 0 if the offscreen
// target is discoverable; 1 if no target with the offscreen URL
// is found.

import { launchHarnessBrowser } from './lib/launch';

async function main(): Promise<number> {
  process.stdout.write('\nMokosh debug session-2 — offscreen target diagnostic\n');
  process.stdout.write('='.repeat(72) + '\n');

  const handles = await launchHarnessBrowser();
  process.stdout.write(`Diagnostic: extensionId=${handles.extensionId}\n\n`);

  // Prime recording (offscreen comes alive here).
  process.stdout.write('Diagnostic: priming via assertA2 to spawn offscreen\n');
  const a2Result = await handles.harnessPage.evaluate(async () => {
    const harness = (
      window as unknown as {
        __mokoshHarness: { assertA2: () => Promise<{ passed: boolean; error?: string }> };
      }
    ).__mokoshHarness;
    return harness.assertA2();
  });
  process.stdout.write(`Diagnostic: assertA2.passed=${a2Result.passed}\n\n`);

  // Wait a moment for the offscreen target to materialize fully.
  await new Promise((res) => setTimeout(res, 1_000));

  // Enumerate every target.
  const allTargets = handles.browser.targets();
  process.stdout.write(`Diagnostic: browser.targets() count = ${allTargets.length}\n`);
  process.stdout.write('-'.repeat(72) + '\n');
  for (const target of allTargets) {
    const targetType = target.type();
    const targetUrl = target.url();
    process.stdout.write(`  type=${targetType.padEnd(20)} url=${targetUrl}\n`);
  }
  process.stdout.write('-'.repeat(72) + '\n');

  // Identify any target that matches the offscreen URL pattern.
  const offscreenCandidates = allTargets.filter((t) => t.url().includes('/src/offscreen/'));
  process.stdout.write(`\nDiagnostic: targets matching '/src/offscreen/' = ${offscreenCandidates.length}\n`);
  for (const candidate of offscreenCandidates) {
    process.stdout.write(
      `  CANDIDATE: type=${candidate.type()} url=${candidate.url()}\n`,
    );
  }

  await handles.browser.close();

  return offscreenCandidates.length > 0 ? 0 : 1;
}

const code = await main();
process.exit(code);