// article.js
// Copyright (C) 2021 Digital Telepresence, LLC
// License: Apache-2.0

'use strict';

const fs = require('fs');

const { SiteService } = require('../../lib/site-lib');

const mongoose = require('mongoose');
const Article = mongoose.model('Article');

const marked = require('marked');

class ArticleService extends SiteService {

  constructor (dtp) {
    super(dtp, module.exports);

    this.populateArticle = [
      {
        path: 'channel',
        select: 'slug name images.icon status stats links',
      },
      {
        path: 'author',
        select: '_id username username_lc displayName picture',
      },
    ];
  }

  async start ( ) {
    this.markedRenderer = new marked.Renderer();
  }

  async getById (articleId) {
    const article = await Article
      .findById(articleId)
      .populate(this.populateArticle)
      .lean();
    return article;
  }

  async getForChannel (channel, pagination) {
    const articles = await Article
      .find({ channel: channel._id })
      .sort({ created: -1 })
      .skip(pagination.skip)
      .limit(pagination.cpp)
      .populate(this.populateArticle)
      .lean();
    return articles;
  }

  async renderMarkdown (documentFile) {
    const markdown = await fs.promises.readFile(documentFile, 'utf8');
    return marked(markdown, { renderer: this.markedRenderer });
  }
}

module.exports = {
  slug: 'article',
  name: 'article',
  create: (dtp) => { return new ArticleService(dtp); },
};