function buildMyWork(data) {
  const login = data.user?.login || '';
  const issues = (data.issues || []).map((item) => ({ ...item, kind: 'issue' }));
  const pulls = (data.pull_requests || []).map((item) => ({ ...item, kind: 'pull' }));
  const priorityLabels = ['p0', 'priority-high', 'critical'];

  const work = issues.concat(pulls).map((item) => {
    const labels = item.labels || [];
    const priorityLabel = labels.find((label) =>
      priorityLabels.includes(String(label).toLowerCase())
    );
    const assigned = (item.assignees || []).includes(login);
    const isReview = (item.work_reasons || []).includes('review_requested');
    return {
      ...item,
      key: (item.repository || 'unknown') + '#' + item.number,
      is_review: isReview,
      is_assigned: assigned,
      has_update: false,
      reason: priorityLabel ? priorityLabel + ' priority' :
        (isReview ? 'Needs your review' : (assigned ? 'Assigned to you' : 'Open work')),
      _priority: priorityLabel ? 0 : (isReview ? 2 : (assigned ? 3 : 4)),
    };
  });

  const byKey = new Map(work.map((item) => [item.kind + ':' + item.key, item]));
  (data.notifications || []).filter((item) => item && item.unread).forEach((update) => {
    const key = (update.repository || 'unknown') + '#' + update.number;
    const subjectKind = String(update.subject_type || '').toLowerCase().includes('pull') ? 'pull' : 'issue';
    const existing = byKey.get(subjectKind + ':' + key);
    if (existing) {
      existing.has_update = true;
      existing.url = update.url || existing.url;
      existing.updated_at = update.updated_at || existing.updated_at;
      existing._priority = Math.min(existing._priority, 1);
      return;
    }
    if (!update.url) return;
    const item = {
      ...update,
      key,
      kind: 'update',
      is_review: false,
      is_assigned: false,
      has_update: true,
      reason: 'Unread update',
      _priority: 1,
    };
    work.push(item);
    byKey.set(subjectKind + ':' + key, item);
  });

  return work.sort((left, right) =>
    left._priority - right._priority ||
    String(right.updated_at || '').localeCompare(String(left.updated_at || '')) ||
    left.key.localeCompare(right.key)
  ).map(({ _priority, ...item }) => item);
}

function filterMyWork(items, selectedFilter) {
  if (selectedFilter === 'all') return items;
  if (selectedFilter === 'review') return items.filter((item) => item.is_review);
  if (selectedFilter === 'update') return items.filter((item) => item.has_update);
  return items.filter((item) => item.kind === selectedFilter);
}

function summarizeMyWork(items) {
  const updates = items.filter((item) => item.has_update).length;
  const reviews = items.filter((item) => item.is_review).length;
  const assigned = items.filter((item) => item.is_assigned).length;
  const updateLabel = updates + ' unread update' + (updates === 1 ? '' : 's');
  const reviewLabel = reviews + ' review' + (reviews === 1 ? '' : 's');
  const assignedLabel = assigned + ' assigned';
  return (updates ? updateLabel + ' · ' : '') + reviewLabel + ' · ' + assignedLabel;
}

function countMyWork(items) {
  return {
    all: items.length,
    issue: items.filter((item) => item.kind === 'issue').length,
    pull: items.filter((item) => item.kind === 'pull' && !item.is_review).length,
    review: items.filter((item) => item.is_review).length,
    update: items.filter((item) => item.has_update).length,
  };
}

if (typeof module !== 'undefined' && module.exports) {
  buildMyWork.filterMyWork = filterMyWork;
  buildMyWork.summarizeMyWork = summarizeMyWork;
  buildMyWork.countMyWork = countMyWork;
  module.exports = buildMyWork;
}