booksCompany.js

const rp = require('request-promise-native');
const cheerio = require('cheerio');

function searchBooks(keywords = '') {
  // URL encode
  keywords = encodeURIComponent(keywords);

  const options = {
    uri: `http://search.books.com.tw/search/query/key/${keywords}/cat/EBA`,
    resolveWithFullResponse: true,
    simple: false,
    gzip: true,
    timeout: 10000,
  };

  return rp(options).then(response => {
    if (!(/^2/.test('' + response.statusCode))) {
      // console.log('Not found or error in books company!');

      return [];
    }

    return _getBooks(cheerio.load(response.body));
  }).catch(error => {
    console.log(error.message);

    return [];
  });
}

// parse 找書
function _getBooks($) {
  const $list = $('#searchlist ul li');

  let books = [];

  // 找不到就是沒這書
  if ($list.length === 0) {
    // console.log('Not found in books company!');

    return books
  }

  $list.each((i, elem) => {

    // 合併作者成一個陣列
    let authors = [];
    $(elem).children('a[rel=go_author]').each((i, elem) => {
      authors = authors.concat($(elem).prop('title').split('、'));
    });

    books[i] = {
      //
      id: $(elem).children('.input_buy').children('input').prop('value'),
      thumbnail: $(elem).children('a').children('img').data('original'),
      title: $(elem).children('h3').children('a').prop('title'),
      link: `http://www.books.com.tw/products/${$(elem).children('.input_buy').children('input').prop('value')}`,
      priceCurrency: 'TWD',
      price: parseFloat($(elem).children('.price').children('strong').last().children('b').text().replace(/NT\$|,/g, '')),
      about: $(elem).children('p').text().replace(/......\ more\n\t\t\t\t\t\t\t\t/g, ' ...'),
      publisher: $(elem).children('a[rel=mid_publish]').prop('title'),
    };

    // 作者群有資料才放
    if (authors.length > 0) {
      books[i].authors;
    }

  });

  return books;
}

exports.searchBooks = searchBooks;