/* Drives the real admin editor in Firefox and reports whether dragging a Page
   actually reorders it and reaches the server. This is the only automated check
   that reaches the drag path: the order is committed from dragover, because
   browsers suppress mouse events during a drag and dragend is not guaranteed.

   Needs a running dev server and geckodriver on PATH:

     npm run dev                     # in one terminal
     geckodriver --port 4444 &       # in another
     npm run check-dnd -- <setId> [native|synthetic|none]

   Use "none" to inspect a set's affordances without dragging: an Archive should
   report no draggable rows and no grab handles.
*/

const GECKO = 'http://127.0.0.1:4444';
const SITE = process.env.SITE ?? 'http://127.0.0.1:3000';
const PASSWORD = process.env.DEV_PASSWORD ?? 'menu-dev-password';
const setId = process.argv[2];
const gesture = process.argv[3] ?? 'native';
if (!setId) throw new Error('usage: node .tmp/dnd.mjs <setId> [native|synthetic|none]');

const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
const KEY = 'element-6066-11e4-a52e-4f735466cecf';

async function cmd(method, path, body) {
  const init = { method };
  if (body) {
    init.headers = { 'content-type': 'application/json' };
    init.body = JSON.stringify(body);
  }
  const response = await fetch(GECKO + path, init);
  const json = JSON.parse(await response.text());
  if (json.value && json.value.error) throw new Error(`${json.value.error}: ${json.value.message}`);
  return json.value;
}
const find = async (sid, selector) =>
  (await cmd('POST', `/session/${sid}/element`, { using: 'css selector', value: selector }))[KEY];
const findAll = async (sid, selector) =>
  (await cmd('POST', `/session/${sid}/elements`, { using: 'css selector', value: selector })).map(
    (e) => e[KEY],
  );
const click = (sid, element) => cmd('POST', `/session/${sid}/element/${element}/click`, {});
const type = (sid, element, value) =>
  cmd('POST', `/session/${sid}/element/${element}/value`, { text: value });
const script = (sid, body, args = []) =>
  cmd('POST', `/session/${sid}/execute/sync`, { script: body, args });

async function pageState(sid) {
  return script(
    sid,
    `return {
       rows: Array.from(document.querySelectorAll('[data-page-id]')).map(function (li) {
         var handle = li.querySelector('.page-admin__handle');
         return {
           id: li.getAttribute('data-page-id'),
           draggable: li.draggable,
           hasHandle: !!handle,
           cursor: handle ? getComputedStyle(handle).cursor : null,
           formCount: li.querySelectorAll('form').length
         };
       }),
       hasList: !!document.querySelector('[data-pages-admin]'),
       scriptLoaded: !!document.querySelector('script[src="/assets/admin.js"]'),
       dnd: window.__dnd || null
     };`,
  );
}

const session = await cmd('POST', '/session', {
  capabilities: { alwaysMatch: { 'moz:firefoxOptions': { args: ['-headless'] } } },
});
const sid = session.sessionId;

try {
  await cmd('POST', `/session/${sid}/window/rect`, { width: 430, height: 1000 });
  await cmd('POST', `/session/${sid}/url`, { url: `${SITE}/admin/login` });
  await sleep(500);
  await type(sid, await find(sid, 'input[name=password]'), PASSWORD);
  await click(sid, await find(sid, 'button[type=submit]'));
  await sleep(800);

  await cmd('POST', `/session/${sid}/url`, { url: `${SITE}/admin/sets/${setId}` });
  await sleep(1000);

  await script(
    sid,
    `window.__dnd = { dragstart: 0, dragover: 0, drop: 0, dragend: 0 };
     ['dragstart','dragover','drop','dragend'].forEach(function (name) {
       document.addEventListener(name, function () { window.__dnd[name] += 1; }, true);
     });
     return true;`,
  );

  const before = await pageState(sid);
  console.log(`rows: ${before.rows.length}`);
  console.log(`draggable rows: ${before.rows.filter((r) => r.draggable).length}`);
  console.log(`rows with a grab handle: ${before.rows.filter((r) => r.hasHandle).length}`);
  console.log(`handle cursor: ${before.rows[0]?.cursor}`);
  console.log(`per-row up/down/delete forms: ${before.rows[0]?.formCount}`);
  console.log(`[data-pages-admin] list present: ${before.hasList}`);
  console.log(`admin.js included: ${before.scriptLoaded}`);
  const beforeIds = before.rows.map((r) => r.id);

  if (gesture === 'native' && before.rows.length >= 3) {
    const elements = await findAll(sid, '[data-page-id]');
    const origin = (element) => ({ [KEY]: element });
    const from = elements[0];
    const to = elements[2];
    await cmd('POST', `/session/${sid}/actions`, {
      actions: [
        {
          type: 'pointer',
          id: 'mouse',
          parameters: { pointerType: 'mouse' },
          actions: [
            { type: 'pointerMove', duration: 0, origin: origin(from), x: 5, y: 5 },
            { type: 'pointerDown', button: 0 },
            { type: 'pause', duration: 200 },
            { type: 'pointerMove', duration: 300, origin: origin(to), x: 5, y: 40 },
            { type: 'pause', duration: 300 },
            { type: 'pointerUp', button: 0 },
          ],
        },
      ],
    });
    await sleep(1200);
  }

  if (gesture === 'synthetic' && before.rows.length >= 3) {
    // Exercises our handlers without the browser's own drag machinery.
    await script(
      sid,
      `var rows = document.querySelectorAll('[data-page-id]');
       var from = rows[0], to = rows[2];
       var rect = to.getBoundingClientRect();
       function fire(target, type, extra) {
         var event = new DragEvent(type, Object.assign({ bubbles: true, cancelable: true, dataTransfer: new DataTransfer() }, extra || {}));
         target.dispatchEvent(event);
       }
       fire(from, 'dragstart');
       fire(to, 'dragover', { clientY: rect.bottom - 2 });
       fire(to, 'drop', { clientY: rect.bottom - 2 });
       fire(from, 'dragend');
       return true;`,
    );
    await sleep(1200);
  }

  const after = await pageState(sid);
  const afterIds = after.rows.map((r) => r.id);
  console.log(`\nevents seen: ${JSON.stringify(after.dnd)}`);

  const domChanged = JSON.stringify(beforeIds) !== JSON.stringify(afterIds);
  console.log(`DOM order changed by the drag: ${domChanged}`);
  if (domChanged) {
    console.log(`  was: ${beforeIds.slice(0, 3).join(', ')} ...`);
    console.log(`  now: ${afterIds.slice(0, 3).join(', ')} ...`);
  }

  // What the server holds now, read back through the editor.
  await cmd('POST', `/session/${sid}/url`, { url: `${SITE}/admin/sets/${setId}` });
  await sleep(800);
  const reloaded = await pageState(sid);
  const serverIds = reloaded.rows.map((r) => r.id);
  const persisted = JSON.stringify(serverIds) !== JSON.stringify(beforeIds);
  console.log(`server order changed (after reload): ${persisted}`);
  if (persisted) console.log(`  server now: ${serverIds.slice(0, 3).join(', ')} ...`);

  console.log(
    `\nVERDICT: ${domChanged && persisted ? 'PASS' : 'FAIL'} (drag reorders and persists)`,
  );
} finally {
  await cmd('DELETE', `/session/${sid}`);
}