function createAssignAndStart({ available, claim, start, recover, announce }) {
  let request = null;

  function run(item, { alreadyOwned = false } = {}) {
    if (request) return request;
    if (!available()) {
      announce('Today is full—remove an item before assigning this issue.');
      return Promise.resolve('full');
    }
    request = Promise.resolve()
      .then(() => alreadyOwned ? item : claim(item))
      .then(confirmed => {
        const outcome = start(confirmed);
        if (outcome === 'started') {
          announce(alreadyOwned ? 'Added to Today and ready to work.' :
            'Assigned, added to Today, and ready to work.');
          return outcome;
        }
        announce(alreadyOwned ?
          'Today could not start. The issue is open so you can recover.' :
          'Assigned to you, but Today could not start. The issue is open so you can recover.');
        recover(confirmed);
        return 'recovery';
      })
      .finally(() => { request = null; });
    return request;
  }

  return { run };
}

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