import { LinkParser } from './links.js';

/**
 * @typedef {{reviewer: Collaborator}} Reviewer
 */
export default class MetadataGenerator {
  /**
   * @param {PRData} data
   */
  constructor(data) {
    const { owner, repo, pr, reviewers, argv, skipRefs } = data;
    this.owner = owner;
    this.skipRefs = skipRefs;
    this.repo = repo;
    this.pr = pr;
    this.reviewers = reviewers;
    this.argv = argv;
  }

  /**
   * @returns {string}
   */
  getMetadata() {
    const {
      reviewers: { approved: reviewedBy },
      pr: { url: prUrl, bodyHTML: op },
      owner,
      repo
    } = this;

    const parser = new LinkParser(owner, repo, op);
    const fixes = parser.getFixes();
    const refs = parser.getRefs().filter(f => f !== prUrl);

    const meta = [];

    // If there are multiple commits in a PR, we may not want to add
    // Fixes/Refs metadata to all of them.
    if (!this.skipRefs) {
      // Map all issues fixed by the commit(s) in this PR.
      meta.push(...fixes.map((fix) => `Fixes: ${fix}`));
      // Map all issues referenced by the commit(s) in this PR.
      meta.push(...refs.map((ref) => `Refs: ${ref}`));
    }
    const backport = this.argv ? this.argv.backport : undefined;
    meta.unshift(`${backport ? 'Backport-' : ''}PR-URL: ${prUrl}`);
    meta.push(
      ...reviewedBy.map((r) => `Reviewed-By: ${r.reviewer.getContact()}`)
    );
    meta.push(''); // creates final EOL
    return meta.join('\n');
  }
}