import * as plugins from './smartfuzzy.plugins';

/**
 * an article search that searches articles in a weighted manner
 */
export class ArticleSearch {
  public articles: plugins.tsclass.content.IArticle[] = [];
  public needsUpdate: boolean = false;

  private readyDeferred = plugins.smartpromise.defer();
  private fuse: plugins.fuseJs<plugins.tsclass.content.IArticle>;

  constructor(articleArrayArg?: plugins.tsclass.content.IArticle[]) {
    this.fuse = new plugins.fuseJs(this.articles);
    this.readyDeferred.resolve();
    if (articleArrayArg) {
      for (const article of articleArrayArg) {
        this.addArticle(article);
      }
    }
  }

  /**
   * allows adding an article
   */
  addArticle(articleArg: plugins.tsclass.content.IArticle) {
    this.articles.push(articleArg);
    this.needsUpdate = true;
  }

  /**
   * allows searching an article
   */
  public async search(searchStringArg: string) {
    if (this.needsUpdate) {
      const oldDeferred = this.readyDeferred;
      this.readyDeferred = plugins.smartpromise.defer();
      this.needsUpdate = false;
      if (oldDeferred.status !== 'fulfilled') {
        this.readyDeferred.promise.then(oldDeferred.resolve);
      }
      this.fuse = new plugins.fuseJs(this.articles, {
        keys: [
          {
            name: 'title',
            weight: 3,
          },
          {
            name: 'tags',
            weight: 2,
          },
          {
            name: 'content',
            weight: 1,
          },
        ],
        includeMatches: true,
      });
      this.readyDeferred.resolve();
    } else {
      await this.readyDeferred.promise;
    }
    return this.fuse.search(searchStringArg);
  }
}