18.js

function generateReadReport(readList, recommendList) {
  const reportData = createReportData(readList, recommendList);
  return renderPlainText(reportData);
}

function createReportData(readList, recommendList) {
  const reportData = {};
  reportData.userName = readList.name;
  reportData.readBooks = readList.books
    .map(book => {
      return {...book, point: point(book)};
    });
  reportData.total = total(reportData);
  return reportData;

  function total(reportData) {
    return reportData.readBooks
      .reduce((total, book) => total + book.point, 0);
  }

  function point(readBook) {
    if (readBook.times <= 0) {
      return 0;
    }
    if (notRecommendBook()) {
      return 1;
    }

    if (readBook.times >= 3) {
      return 8;
    } else if (readBook.times === 2) {
      return 5;
    } else if (readBook.times === 1) {
      return 3;
    } else {
      return 0;
    }

    function notRecommendBook() {
      return !recommendList.map(recommend => recommend.asin).includes(readBook.asin);
    }
  }
}

function renderPlainText(reportData) {
  let report = `name: ${reportData.userName}\n`;
  report += '-----\n';
  for (let book of reportData.readBooks) {
    if (book.times >= 1) {
      report += `  - ${book.name}: ${book.point} point\n`;
    }
  }
  report += '-----\n';
  report += `total: ${reportData.total} point`;
  return report;
}

module.exports = generateReadReport;