/**
 * Capture screenshots for every route × viewport against the dummy backend.
 *
 * Usage:
 *   node test/capture.mjs [--out test/screenshots/current]
 *
 * Flow: spawns the dummy backend (default :4218) + `vite --port 4229` with
 * RIG_API_TARGET pointing at the dummy, then drives a persistent headless
 * Chrome (remote-debugging port) via CDP: one fresh page target per shot,
 * waits for React hydration + data, captures full-page PNGs. No npm deps.
 *
 * The dummy backend is always-authed, so no login step is needed.
 */
import { spawn } from 'node:child_process';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { ROUTES, VIEWPORTS } from './routes.mjs';
import { capturePage } from './cdp.mjs';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const FRONT_ROOT = path.resolve(__dirname, '..');

const args = Object.fromEntries(
  process.argv.slice(2).map((a) => {
    const [k, v] = a.split('=');
    return [k.replace(/^--/, ''), v ?? true];
  }),
);
const OUT_DIR = path.resolve(FRONT_ROOT, args.out ?? 'test/screenshots/current');
const DUMMY_PORT = Number(args['dummy-port'] ?? 4218);
const VITE_PORT = Number(args['vite-port'] ?? 4229);
const DEBUG_PORT = Number(args['debug-port'] ?? 9333);
const BASE = `http://localhost:${VITE_PORT}`;
const SETTLE_MS = Number(args.settle ?? 2500);
const CHROME = args.chrome ?? '/usr/bin/google-chrome';

function wait(ms) {
  return new Promise((r) => setTimeout(r, ms));
}

async function waitForPort(port, host = '127.0.0.1', timeoutMs = 45000) {
  const net = await import('node:net');
  const start = Date.now();
  for (;;) {
    try {
      await new Promise((resolve, reject) => {
        const s = net.default.connect(port, host);
        s.on('connect', () => {
          s.end();
          resolve();
        });
        s.on('error', reject);
      });
      return;
    } catch {
      if (Date.now() - start > timeoutMs) throw new Error(`port ${port} not ready`);
      await wait(300);
    }
  }
}

function startProc(cmd, procArgs, env, tag) {
  const child = spawn(cmd, procArgs, {
    cwd: FRONT_ROOT,
    env: { ...process.env, ...env },
    stdio: ['ignore', 'pipe', 'pipe'],
  });
  child.stdout.on('data', (d) => process.stdout.write(`[${tag}] ${d}`));
  child.stderr.on('data', (d) => {
    const text = String(d);
    // vite proxy logs are noise during capture; keep errors.
    if (tag === 'vite' && text.includes('[vite-proxy]')) return;
    process.stderr.write(`[${tag}] ${d}`);
  });
  return child;
}

async function main() {
  if (!fs.existsSync(CHROME)) {
    throw new Error(`Chrome not found at ${CHROME} (pass --chrome=...)`);
  }
  if (!fs.existsSync(path.join(FRONT_ROOT, 'test', 'fixtures', 'snapshot.json'))) {
    throw new Error('Missing test/fixtures/snapshot.json — run: npm run rig:collect');
  }
  fs.mkdirSync(OUT_DIR, { recursive: true });

  const dummy = startProc('node', ['test/dummyBackend.mjs', `--port=${DUMMY_PORT}`], {}, 'dummy');
  await waitForPort(DUMMY_PORT);

  const vite = startProc(
    'npx',
    ['vite', '--port', String(VITE_PORT), '--strictPort'],
    { RIG_API_TARGET: `http://localhost:${DUMMY_PORT}` },
    'vite',
  );
  await waitForPort(VITE_PORT);
  await wait(3000);

  const profile = '/tmp/rig-chrome-profile';
  fs.mkdirSync(profile, { recursive: true });
  const chrome = startProc(
    CHROME,
    [
      '--headless=new',
      '--no-sandbox',
      '--disable-gpu',
      '--hide-scrollbars',
      `--remote-debugging-port=${DEBUG_PORT}`,
      `--user-data-dir=${profile}`,
      'about:blank',
    ],
    {},
    'chrome',
  );
  await waitForPort(DEBUG_PORT);

  let failed = 0;
  try {
    for (const viewport of VIEWPORTS) {
      for (const route of ROUTES) {
        const file = path.join(OUT_DIR, `${route.name}.${viewport.name}.png`);
        try {
          await capturePage(DEBUG_PORT, `${BASE}${route.path}`, file, {
            width: viewport.width,
            height: viewport.height,
            settleMs: SETTLE_MS,
          });
          const kb = (fs.statSync(file).size / 1024).toFixed(0);
          console.log(`[capture] ${route.path} @ ${viewport.name} → ${path.basename(file)} (${kb} KiB)`);
        } catch (err) {
          console.error(`[capture] FAIL ${route.path} @ ${viewport.name}: ${err.message}`);
          failed++;
        }
      }
    }
  } finally {
    chrome.kill();
    vite.kill();
    dummy.kill();
  }
  if (failed > 0) {
    console.error(`[capture] ${failed} shots failed`);
    process.exit(1);
  }
  console.log(`[capture] done → ${OUT_DIR}`);
}

main().catch((err) => {
  console.error(`[capture] FAILED: ${err.message}`);
  process.exit(1);
});