function formatCommit(commit) {
  return {
    sha: commit.sha,
    owner: commit.committer.login,
    message: commit.commit.message,
  };
}

function formatCommits(commits, lastOnly) {
  if (lastOnly) return formatCommit(commits.pop());
  return commits.map(c => formatCommit(c));
}

export default async function getCommits(repo, id, lastOnly = true) {
  const commits = await repo.pulls(id).commits.fetch();

  if (commits.lastPage) {
    const { items } = await commits.lastPage.fetch();
    return formatCommits(items, lastOnly);
  }

  return formatCommits(commits.items, lastOnly);
}