(function (root, factory) {
  if (typeof module === 'object' && module.exports) module.exports = factory;
  else root.createMobileStartDay = factory;
})(typeof self !== 'undefined' ? self : this, function createMobileStartDay(options) {
  const reviewOrder = [
    ['agenda', 'Agenda'],
    ['attention', 'Attention'],
    ['update', 'Updates'],
    ['filed', 'Filed'],
  ];

  function count(value) {
    return Math.max(0, Number(value) || 0);
  }

  function briefing() {
    const counts = options.getCounts ? options.getCounts() : {};
    const phases = reviewOrder
      .map(([name, label]) => ({name, label, count: count(counts[name])}))
      .filter(phase => phase.count > 0);
    const total = phases.reduce((sum, phase) => sum + phase.count, 0);
    const today = count(counts.today);
    const next = phases.length ? phases[0].name : (today ? 'today' : 'find');
    const nextLabel = phases.length ? 'Review ' + phases[0].label : (today ? 'Continue Today' : 'Find Work');
    return {
      total,
      next,
      label: nextLabel,
      summary: total ? total + ' items before Today · ' + today + ' planned' :
        (today ? 'Review clear · ' + today + ' planned' : 'Review clear · Today is empty'),
      phases,
    };
  }

  function startNext() {
    const next = briefing().next;
    options.openQueue(next);
    return next;
  }

  function render() {
    const current = briefing();
    if (!options.elements) return current;
    options.elements.summary.textContent = current.summary;
    options.elements.phases.textContent = current.phases.length ?
      current.phases.map(phase => phase.label + ' ' + phase.count).join(' · ') :
      'All urgent queues reviewed';
    options.elements.action.textContent = current.label;
    return current;
  }

  function start() {
    render();
    if (options.elements) options.elements.action.addEventListener('click', startNext);
  }

  return {briefing, render, start, startNext};
});