async function loadWorkspace({
  document,
  window = null,
  createLoader = createFeatureLoader,
  schedule = callback => setTimeout(callback, 750),
}) {
  let cameOnline = false;
  let replayed = false;

  const status = document.querySelector('#my-work-action-status');
  const retryButton = document.querySelector('#retry-workspace');
  const names = ['work-core', 'today-timer', 'planning'];
  const urls = Object.fromEntries(names.map(name => [name,
    document.querySelector(`meta[name="stackchain-feature-${name}"]`)?.content || ''
  ]));
  const originalUrls = {...urls};
  const loader = createLoader({document, urls});
  const attempts = Object.fromEntries(names.map(name => [name, 0]));
  const failed = new Set();
  const recoveries = new Map();
  let retryInFlight = null;
  let resolveWorkspaceReady;
  const workspaceReady = new Promise(resolve => { resolveWorkspaceReady = resolve; });
  let workspaceMarkedReady = false;
  const markWorkspaceReady = () => {
    if (workspaceMarkedReady) return false;
    workspaceMarkedReady = true;
    resolveWorkspaceReady(true);
    return true;
  };

  const loadFeature = name => {
    attempts[name] += 1;
    urls[name] = originalUrls[name] + (attempts[name] > 1 ? '?retry=' + attempts[name] : '');
    return loader.load(name);
  };
  const retryOnce = async name => {
    try { return await loadFeature(name); }
    catch (_error) {
      await new Promise(resolve => schedule(resolve));
      return loadFeature(name);
    }
  };
  const showRecovery = () => {
    if (status) status.textContent = failed.has('work-core') ?
      'Workspace unavailable. Reconnect or retry.' :
      'Today or planning tools unavailable. My Work is ready; reconnect or retry.';
    if (retryButton) retryButton.hidden = retryButton.disabled = false;
  };
  const hideRecovery = () => {
    if (failed.size) return;
    if (retryButton) retryButton.hidden = true;
    if (status) status.textContent = '';
  };
  const retryFailed = () => {
    if (retryInFlight) return retryInFlight;
    if (retryButton) retryButton.disabled = true;
    const pending = Array.from(failed);
    retryInFlight = Promise.all(pending.map(async name => {
      try {
        await loadFeature(name);
        failed.delete(name);
        recoveries.get(name)?.resolve(true);
        recoveries.delete(name);
      } catch (_error) {}
    })).then(() => {
      if (failed.size) showRecovery();
      else hideRecovery();
    }).finally(() => { retryInFlight = null; });
    return retryInFlight;
  };
  retryButton?.addEventListener?.('click', retryFailed);
  const handleOnline = () => { cameOnline = true; void retryFailed(); };
  window?.addEventListener('online', handleOnline);
  const serviceWorkerReady = window?.navigator?.serviceWorker?.register ?
    window.navigator.serviceWorker.register('service-worker.js') : Promise.resolve(null);

  try {
    await retryOnce('work-core');
  } catch (_error) {
    failed.add('work-core');
    showRecovery();
    await new Promise(resolve => recoveries.set('work-core', {resolve}));
  }
  hideRecovery();

  let optionalReady = null;
  const hydrateWorkspace = () => {
    if (optionalReady) return optionalReady;
    let resolveOptional;
    optionalReady = new Promise(resolve => { resolveOptional = resolve; });
    const optional = ['today-timer', 'planning'].map(async name => {
      try {
        await retryOnce(name);
        return true;
      } catch (_error) {
        failed.add(name);
        showRecovery();
        return new Promise(resolve => recoveries.set(name, {resolve}));
      }
    });
    Promise.all(optional).then(() => {
      hideRecovery();
      resolveOptional(true);
    });
    return optionalReady;
  };

  const hydrationSelector = [
    '[data-mobile-task]:not([data-mobile-task="queues"])',
    '[data-progressive-loading="true"]',
    '#app-menu-toggle',
    '#work-settings-toggle',
  ].join(',');
  const hydrateForAction = async event => {
    const target = event.target?.closest?.(hydrationSelector);
    if (!target) return;
    event.preventDefault();
    event.stopImmediatePropagation();
    await hydrateWorkspace();
    await workspaceReady;
    document.removeEventListener?.('click', hydrateForAction, true);
    target.click?.();
  };
  document.addEventListener?.('click', hydrateForAction, true);
  const hash = window?.location?.hash || '';
  const deepLinkReady = hash.startsWith('#/') && hash !== '#/my-work' ?
    hydrateWorkspace() : Promise.resolve(false);

  return {
    hydrateWorkspace,
    deepLinkReady,
    workspaceReady,
    markWorkspaceReady,
    serviceWorkerReady,
    get optionalReady() { return hydrateWorkspace(); },
    retryFeature(name) {
      if (!failed.has(name)) return Promise.resolve(true);
      return retryFailed().then(() => !failed.has(name));
    },
    replayOnline(callback) {
      if (replayed) return;
      replayed = true;
      window?.removeEventListener('online', handleOnline);
      if (cameOnline) callback();
    },
  };
}

if (typeof window !== 'undefined' && typeof document !== 'undefined' &&
    typeof createFeatureLoader === 'function') {
  window.stackchainWorkspaceLifecycle = loadWorkspace({document, window});
}

if (typeof module !== 'undefined' && module.exports) module.exports = loadWorkspace;