const _warned = {};
const NO_RESULT = [false, null];

export default class LinkLookup {

  constructor(links) {
    this._links = links;
  }

  check(post, href) {
    if (_warned[href]) { return NO_RESULT; }

    const normalized = href.replace(/^https?:\/\//, '').replace(/\/$/, '');
    if (_warned[normalized]) { return NO_RESULT; }

    const linkInfo = this._links[normalized];
    if (linkInfo) {

      if (post) {
        // Skip edits to the OP
        if (post) {
          const postNumber = post.get('post_number');
          if (postNumber === 1 || postNumber === linkInfo.post_number) { return NO_RESULT; }
        }

        // Don't warn on older posts
        const createdAt = moment(post.get('created_at'));
        if (createdAt.isBefore(moment().subtract(2, 'weeks'))) {
          return NO_RESULT;
        }
      }

      _warned[href] = true;
      _warned[normalized] = true;
      return [true, linkInfo];
    }

    return NO_RESULT;
  }
};