const { CLOSING_VERBS } = process.env;

const closingVerbs = CLOSING_VERBS
  ? // converts CLOSING_VERBS=test,abc to [ 'test', 'abc' ]
    CLOSING_VERBS.split(",")
  : // default
    ["closes", "fixes", "fixed", "resolves", "resolved", "gotem"];

const descMatching = new RegExp(
  `(?:${closingVerbs.join("|")}) +([\\d, #]+)`,
  "i"
);

module.exports = function extractIssueNumbers(...str) {
  return str.reduce((issueNumbers, s) => {
    // branch mode
    if (s.indexOf(" ") < 0) {
      let brMatch = /#(\d+)/.exec(s);

      if (brMatch && brMatch[1]) {
        issueNumbers.push(brMatch[1]);
        return issueNumbers;
      }
    }

    // plain mode
    let match = descMatching.exec(s);

    if (!match || !match[1]) {
      return issueNumbers;
    }

    return [...issueNumbers, ...match[1].replace(/\s|#/g, "").split(",")];
  }, []);
};