# all files / lighthouse-core/formatters/ user-timings.js

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     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    'use strict';

    const Formatter = require('./formatter');
    const path = require('path');
    const fs = require('fs');
    const html = fs.readFileSync(path.join(__dirname, 'partials/user-timings.html'), 'utf8');

    class UserTimings extends Formatter {
      static getFormatter(type) {
        switch (type) {
          case 'pretty':
            return events => {
              if (!Array.isArray(events)) {
                return '';
              }

              const output = `    - performance.measure events created by the site\n` +
              events.reduce((prev, event) => {
                let output = prev + `      - ${event.isMark ? 'Mark' : 'Measure'}: ${event.name}\n` +
                '        - Start Time: ' + event.startTime.toFixed(2) + 'ms\n';
                Eif (!event.isMark) {
                  output += '        - End Time: ' + event.endTime.toFixed(2) + '\n' +
                  '        - Duration: ' + event.duration.toFixed(2) + 'ms\n';
                }

                return output;
              }, '');

              return output;
            };

          case 'html':
            // Returns a handlebars string to be used by the Report.
            return html;

          default:
            throw new Error('Unknown formatter type');
        }
      }
    }

    module.exports = UserTimings;