functions.js

/**
 * Filter Pull Requests to get the one to review
 * @param {Array} pullRequests Pull Requests to filter
 * @return {Array} Pull Requests to review
 */
function getPullRequestsToReview(pullRequests) {
  return pullRequests.filter((pr) => pr.requested_reviewers.length || pr.requested_teams.length);
}

/**
 * Create an Array of Objects with { url, title, login } properties from a list of Pull Requests
 * @param {Array} pullRequestsToReview Pull Requests
 * @return {Array} Array of Objects with { url, title, login } properties
 */
function createPr2UserArray(pullRequestsToReview) {
  const pr2user = [];
  for (const pr of pullRequestsToReview) {
    for (const user of pr.requested_reviewers) {
      pr2user.push({
        url: pr.html_url,
        title: pr.title,
        login: user.login,
      });
    }
    for (const team of pr.requested_teams) {
      pr2user.push({
        url: pr.html_url,
        title: pr.title,
        login: team.slug,
      });
    }
  }
  return pr2user;
}

/**
 * Convert a string like "name1:ID123,name2:ID456" to an Object { name1: "ID123", name2: "ID456"}
 * @param {String} str String to convert to Object
 * @return {Object} Object with usernames as properties and IDs as values
 */
function stringToObject(str) {
  const map = {};
  if (!str) {
    return map;
  }
  const users = str.split(',');
  users.forEach((user) => {
    const [github, provider] = user.split(':');
    map[github] = provider;
  });
  return map;
}

/**
 * Create a pretty message to print
 * @param {Array} pr2user Array of Object with these properties { url, title, login }
 * @param {String} github2provider String containing usernames and IDs as "username:id,..."
 * @param {String} provider Service to use: slack or msteams
 * @return {String} Pretty message to print
 */
function prettyMessage(pr2user, github2provider, provider) {
  let message = '';
  for (const obj of pr2user) {
    const mention = github2provider[obj.login] ?
      `<@${github2provider[obj.login]}>` :
      `@${obj.login}`;
    switch (provider) {
      case 'slack':
        message += `Hey ${mention}, the PR "${obj.title}" is waiting for your review: ${obj.url}\n`;
        break;
      case 'msteams':
        // eslint-disable-next-line max-len
        message += `Hey ${mention}, the PR "${obj.title}" is waiting for your review: [${obj.url}](${obj.url})  \n`;
        break;
    }
  }
  return message;
}

module.exports = {
  getPullRequestsToReview,
  createPr2UserArray,
  stringToObject,
  prettyMessage,
};