(function (root, factory) {
  const createPhotoDraftInbox = factory();
  if (typeof module === 'object' && module.exports) module.exports = createPhotoDraftInbox;
  else root.createPhotoDraftInbox = createPhotoDraftInbox;
})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
  'use strict';

  function targetKey(route) {
    if (route?.kind === 'update') {
      const notificationId = Number(route.notification_id || 0);
      return notificationId > 0 ? 'update:' + notificationId : '';
    }
    const kind = route?.kind === 'search' ? route.target_kind : route?.kind;
    const repository = String(route?.repository || '');
    const number = Number(route?.number || 0);
    return ['issue', 'pull'].includes(kind) && repository && number > 0 ?
      kind + ':' + repository.toLowerCase() + '#' + number : '';
  }

  function removeTarget(item) {
    const route = item?.route || {};
    if (route.kind === 'update') return { kind:'update', notificationId:Number(route.notification_id) };
    return {
      kind:route.kind === 'search' ? route.target_kind : route.kind,
      repository:route.repository,
      number:Number(route.number),
    };
  }

  return function createPhotoDraftInbox({ conversation, search }) {
    let items = [];

    async function refresh(existing = []) {
      const occupied = new Set(existing.map(item => targetKey(item?.route)).filter(Boolean));
      const results = await Promise.allSettled([
        conversation?.list?.() || [],
        search?.list?.() || [],
      ]);
      items = results.flatMap(result => result.status === 'fulfilled' && Array.isArray(result.value) ? result.value : [])
        .filter(item => {
          const key = targetKey(item?.route);
          if (!key || occupied.has(key)) return false;
          occupied.add(key);
          return true;
        })
        .sort((left, right) => Number(right.updated_at || 0) - Number(left.updated_at || 0) ||
          String(left.id || '').localeCompare(String(right.id || '')));
      return items.slice();
    }

    function list() { return items.slice(); }

    async function discard(item) {
      if (!item || !items.some(candidate => candidate.id === item.id && candidate.photo_store === item.photo_store)) {
        return false;
      }
      const store = item.photo_store === 'search' ? search : conversation;
      if (!store?.remove) return false;
      await store.remove(removeTarget(item));
      items = items.filter(candidate => !(candidate.id === item.id && candidate.photo_store === item.photo_store));
      return true;
    }

    function description(item) {
      return item?.kind === 'photo-reply' ?
        Number(item.photo_count || 0) + (Number(item.photo_count) === 1 ? ' saved photo' : ' saved photos') :
        (item?.preview || 'Unfinished draft');
    }

    function searchTarget(item) {
      const route = item?.route || {};
      return {
        kind:route.target_kind, repository:route.repository,
        number:route.number, title:item?.title,
      };
    }

    return { refresh, list, discard, description, searchTarget };
  };
});