let request = require ('request');
let Parser = require ('rss-parser');
let summarizer = require ('nodejs-text-summarizer');
var htmlToText = require ('html-to-text');
const constants = require ('../config/constants');

let parser = new Parser ();

getDataFromRSSFeed = function (url) {
  //let feed = await parser.parseURL(url);
  //console.log(feed.title);
  //feed.items.forEach(item => {
  //  console.log(item.title + ':' + item.link)
  //});
};

getDataFromWPJSON = function (sourceUrl, page = 1, maxPosts = 10) {
  return new Promise ((resolve, reject) => {
    var options = {
      method: 'GET',
      url: `${sourceUrl}/wp-json/wp/v2/posts`,
      qs: {
        page: page,
        per_page: maxPosts,
      },
    };

    request (options, (error, response, body) => {
      if (error) {
        reject (error);
      } else {
        resolve (JSON.parse (body));
      }
    });
  });
};

summarizeText = function (text, length, clearText = true) {
  if (clearText) {
    text = htmlToText.fromString (text, {
      wordwrap: false,
      ignoreHref: true,
      ignoreImage: true,
    });
  }

  return summarizer (text, {n: length});
};

getTitlesFromWP = function (sourceUrl) {
  return new Promise ((resolve, reject) => {
    getDataFromWPJSON (sourceUrl)
      .then (rawData => {
        let result = '';
        rawData.forEach (post => {
          result +=
            post.title.rendered +
            `<break time="${constants.voiceResponseTimings.PAUSE_BETWEEN_TITLES}ms"/> `;
        });
        resolve (result);
      })
      .catch (err => {
        reject (constants.voiceResponseStrings.ERROR_FETCHING_CONTENT);
      });
  });
};

getLatestNewsFromWP = function (
  sourceUrl,
  postCount = 10,
  includeTitle = false
) {
  return new Promise ((resolve, reject) => {
    getDataFromWPJSON (sourceUrl, 1, postCount)
      .then (rawData => {
        let result = '';
        let htmlToTextOptions = {
          wordwrap: false,
          ignoreHref: true,
          ignoreImage: true,
        };

        try {
          rawData.forEach (post => {
            result += includeTitle ? post.title.rendered : '';
            result += includeTitle
              ? `<break time="${constants.voiceResponseTimings.PAUSE_BETWEEN_TITLE_AND_CONTENT}ms"/>`
              : '';
            result += summarizeText (
              post.content.rendered,
              constants.FIXED_SUMMARY_LENGTH
            );
            result += `<break time="${constants.voiceResponseTimings.PAUSE_BETWEEN_NEWS}ms"/>`;
          });

          resolve (result);
        } catch (err) {
          reject (constants.voiceResponseStrings.ERROR_SUMMARIZING_CONTENT);
        }
      })
      .catch (err => {
        reject (constants.voiceResponseStrings.ERROR_FETCHING_CONTENT);
      });
  });
};

module.exports = {
  getAnswerFromWP: function (sourceUrl, contentType) {
    //This function will extract needed data from JSON, which we got from getDataFromWPJSON
    switch (contentType) {
      case constants.contentType.TITLES:
        return getTitlesFromWP (sourceUrl);
        break;
      case constants.contentType.NEWS:
        return getLatestNewsFromWP (sourceUrl);
        break;
    }
  },
};