// tests/uat/spike-a33-sw-persistence.ts — Plan 04-04 Wave 0 SPIKE.
//
// One-shot empirical investigation: does the offscreen document survive
// a 5-min idle window followed by Puppeteer-driven force-termination
// of the MV3 service worker? Per RESEARCH Q2 (sub-question b), the
// canonical architecture analysis says yes (offscreen has its own
// lifecycle, anchored by active MediaRecorder); RESEARCH confidence
// is MEDIUM because the Chrome docs leave the offscreen-vs-SW interplay
// implicit. This spike is the empirical hedge.
//
// Outcome decision tree:
//   - videoSize > 100_000 bytes → SPIKE PASSED. Plan 04-04 Wave 1
//     proceeds: A33 is a verification-only harness assertion that
//     wraps the spike methodology. ROADMAP SC #1 satisfied by the
//     CURRENT architecture; no persistence layer needed.
//   - videoSize <= 100_000 bytes OR throw → SPIKE FAILED. Plan 04-04
//     STOPS execution; SUMMARY documents the failure mode; the next
//     planning event proposes IndexedDB persistence work (out of
//     scope for this plan per the spike-first contract).
//
// Architectural reuse:
//   - `setupFreshRecording` is module-internal inside
//     `extension-page-harness.ts` (NOT exposed on `__mokoshHarness`).
//     The exposed `assertA2` method is the canonical "prime fresh
//     recording" entrypoint — it calls `ensureOffscreen + startRecording`
//     and waits for `badge === 'REC'`. After `assertA2` returns,
//     `MediaRecorder.state === 'recording'` and the offscreen is the
//     "compelling reason" Chrome keeps it alive for. This matches the
//     existing precedent: A3+A4 chain off A2's REC state.
//   - SAVE_ARCHIVE dispatch uses `chrome.runtime.sendMessage` directly
//     from the harness page realm (which is an extension-page realm
//     with full chrome.* access). This matches the canonical pattern
//     used by 9 existing assertA* methods (A5/A11/A12/A13/A26/A28/
//     A29/A30/A31). The __mokoshHarness surface is assertA1..A31 +
//     getManifestVersion only (no SAVE-dispatch helper) — Option B
//     per Plan 04-04 REVISION iter-2.
//
// References:
//   - Plan 04-04 PLAN.md <tasks> Task 1
//   - .planning/phases/04-harden-clean-up-optional/04-RESEARCH.md Q2
//   - https://developer.chrome.com/docs/extensions/how-to/test/test-serviceworker-termination-with-puppeteer
//
// Operation: tsx tests/uat/spike-a33-sw-persistence.ts (HEADLESS=1 for CI).
// Expected wall-clock: ~6-7 minutes (5 min idle + 1-2 min orchestration).

import { readFileSync } from 'node:fs';

import JSZip from 'jszip';

import { launchHarnessBrowser } from './lib/launch';
import { findLatestZip, stopServiceWorker } from './lib/harness-page-driver';

/** Wall-clock idle window. 5 min matches ROADMAP SC #1's "5+ min idle". */
const SPIKE_IDLE_WAIT_MS = 5 * 60 * 1000;
/** Post-`worker.close()` settle so the SW teardown finishes. */
const SPIKE_NEW_SW_BOOT_MS = 500;
/** SAVE_ARCHIVE round-trip timeout. */
const SPIKE_SAVE_ARCHIVE_TIMEOUT_MS = 15_000;
/** Post-SAVE settle so chrome.downloads finishes writing the zip. */
const SPIKE_DOWNLOAD_SETTLE_MS = 5_000;
/** Pass/fail floor: real archives are 1-3 MB; 100 KB is a sanity floor
 *  above any "near-empty" failure mode (a near-empty zip with just
 *  meta.json + screenshot is ~50 KB; anything above 100 KB means the
 *  video buffer actually contained segments). */
const SPIKE_VIDEO_SIZE_FLOOR_BYTES = 100_000;

/**
 * Spike entrypoint. Returns a Node exit code (0 = PASSED, 1 = FAILED).
 */
async function main(): Promise<number> {
  process.stdout.write('\nMokosh Plan 04-04 Wave 0 SPIKE — SW state persistence empirical test\n');
  process.stdout.write('='.repeat(72) + '\n');
  process.stdout.write(
    `SPIKE: idle window = ${SPIKE_IDLE_WAIT_MS}ms (${SPIKE_IDLE_WAIT_MS / 60_000} min); ` +
      `pass floor = ${SPIKE_VIDEO_SIZE_FLOOR_BYTES} bytes\n\n`,
  );

  const t0 = Date.now();
  const handles = await launchHarnessBrowser();
  process.stdout.write(`SPIKE: launched browser; extensionId=${handles.extensionId}\n`);
  process.stdout.write(`SPIKE: downloadsDir=${handles.downloadsDir}\n\n`);

  let videoSize = 0;
  let spikeError: string | null = null;

  try {
    // Step 1 — prime recording via assertA2. assertA2 is the canonical
    // exposed "go to REC state" method on __mokoshHarness (read_first
    // verified: __mokoshHarness has assertA1..A31 + getManifestVersion;
    // assertA1 is read-only state inspection, NOT recording bootstrap;
    // setupFreshRecording is module-internal, NOT exposed). assertA2
    // does ensureOffscreen + startRecording + waitFor(badge==='REC').
    process.stdout.write('SPIKE Step 1: prime recording via __mokoshHarness.assertA2\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(
      `SPIKE Step 1 result: assertA2.passed=${a2Result.passed}` +
        (a2Result.error !== undefined ? `, error=${a2Result.error}` : '') +
        '\n',
    );
    if (!a2Result.passed) {
      throw new Error(`assertA2 priming failed: ${a2Result.error ?? '(no error)'}`);
    }

    // Step 2 — 5-min wall-clock idle. The whole point of the spike.
    process.stdout.write(`\nSPIKE Step 2: waiting ${SPIKE_IDLE_WAIT_MS}ms for SW idle window...\n`);
    process.stdout.write(`SPIKE Step 2: ETA ${new Date(Date.now() + SPIKE_IDLE_WAIT_MS).toISOString()}\n`);
    await new Promise((res) => setTimeout(res, SPIKE_IDLE_WAIT_MS));
    process.stdout.write('SPIKE Step 2 OK — 5-min idle elapsed\n');

    // Step 3 — force-terminate the SW via Puppeteer CDP worker.close().
    process.stdout.write('\nSPIKE Step 3: stopServiceWorker(browser, extensionId)\n');
    await stopServiceWorker(handles.browser, handles.extensionId);
    process.stdout.write('SPIKE Step 3 OK — SW terminated via worker.close()\n');

    // Step 4 — brief settle for SW teardown.
    await new Promise((res) => setTimeout(res, SPIKE_NEW_SW_BOOT_MS));

    // Step 5 — dispatch SAVE_ARCHIVE via chrome.runtime.sendMessage from
    // the harness page realm. The first message after worker.close()
    // wakes the SW back up (event-driven respawn — canonical MV3 wakeup
    // path). SAVE_ARCHIVE then triggers saveArchive() which calls
    // getVideoBufferFromOffscreen() — if the offscreen survived, the
    // segments array still has the accumulated 30s of webm chunks.
    process.stdout.write('\nSPIKE Step 5: chrome.runtime.sendMessage({type: SAVE_ARCHIVE}) inline\n');
    const saveResult = await handles.harnessPage.evaluate(
      (timeoutMs: number) =>
        new Promise<{ success: boolean; error?: string }>((resolve) => {
          const timer = setTimeout(() => {
            resolve({ success: false, error: `SAVE_ARCHIVE timed out after ${timeoutMs}ms` });
          }, timeoutMs);
          chrome.runtime.sendMessage({ type: 'SAVE_ARCHIVE' }, (response: unknown) => {
            clearTimeout(timer);
            if (chrome.runtime.lastError !== undefined) {
              resolve({ success: false, error: String(chrome.runtime.lastError.message) });
              return;
            }
            resolve(response as { success: boolean; error?: string });
          });
        }),
      SPIKE_SAVE_ARCHIVE_TIMEOUT_MS,
    );
    process.stdout.write(`SPIKE Step 5 result: SAVE_ARCHIVE ack -> ${JSON.stringify(saveResult)}\n`);

    // Step 6 — let chrome.downloads finish writing the file.
    await new Promise((res) => setTimeout(res, SPIKE_DOWNLOAD_SETTLE_MS));

    // Step 7 — find the produced zip + measure the video entry.
    process.stdout.write('\nSPIKE Step 7: locate zip + inspect video/last_30sec.webm\n');
    const zipPath = findLatestZip(handles.downloadsDir);
    if (zipPath === null) {
      throw new Error(`No zip found in downloadsDir=${handles.downloadsDir}`);
    }
    process.stdout.write(`SPIKE Step 7: zipPath=${zipPath}\n`);

    const zip = await JSZip.loadAsync(readFileSync(zipPath));
    const videoEntry = zip.file('video/last_30sec.webm');
    videoSize = videoEntry !== null ? (await videoEntry.async('uint8array')).byteLength : 0;
  } catch (err) {
    spikeError = err instanceof Error ? err.message : String(err);
    process.stderr.write(`\nSPIKE THREW: ${spikeError}\n`);
  } finally {
    try {
      await handles.browser.close();
    } catch (closeErr) {
      process.stderr.write(`(non-fatal: browser close threw: ${String(closeErr)})\n`);
    }
  }

  const tEnd = Date.now();
  const elapsedSec = (tEnd - t0) / 1000;

  process.stdout.write('\n' + '='.repeat(72) + '\n');
  process.stdout.write(`SPIKE RESULT: videoSize=${videoSize} bytes (floor=${SPIKE_VIDEO_SIZE_FLOOR_BYTES}; elapsed=${elapsedSec.toFixed(1)}s)\n`);
  if (spikeError !== null) {
    process.stdout.write(`SPIKE OUTCOME: FAILED (spike threw: ${spikeError})\n`);
    process.stdout.write('='.repeat(72) + '\n');
    return 1;
  }
  if (videoSize > SPIKE_VIDEO_SIZE_FLOOR_BYTES) {
    process.stdout.write('SPIKE OUTCOME: PASSED (offscreen SURVIVED the 5-min idle + SW kill)\n');
    process.stdout.write('  ROADMAP SC #1 hypothesis empirically confirmed.\n');
    process.stdout.write('  Plan 04-04 Wave 1 proceeds: A33 verification-only assertion.\n');
    process.stdout.write('='.repeat(72) + '\n');
    return 0;
  }
  process.stdout.write('SPIKE OUTCOME: FAILED (offscreen DIED — videoSize below floor)\n');
  process.stdout.write('  Plan 04-04 Wave 1 BLOCKED: IndexedDB persistence work needed.\n');
  process.stdout.write('  Route via plan-fix ceremony per saved-memory contract.\n');
  process.stdout.write('='.repeat(72) + '\n');
  return 1;
}

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