text: // Copyright (c) 2020 Uber Technologies, Inc.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  import {FileReader} from 'global/window';
  import {processCsvData, processGeojson, processKeplerglJSON} from './data-processor';
  
  const FILE_HANDLERS = {
    csv: loadCsv,
    json: loadJSON
  };
  
  export function getFileHandler(fileBlob) {
    const type = getFileType(fileBlob.name);
    return FILE_HANDLERS[type];
  }
  
  export function getFileType(filename) {
    if (filename.endsWith('csv')) {
      return 'csv';
    } else if (filename.endsWith('json') || filename.endsWith('geojson')) {
      // Read GeoJson from browser
      return 'json';
    }
  
    // Wait to add other file type handler
    return 'other';
  }
  
  function readCSVFile(fileBlob) {
    return new Promise((resolve, reject) => {
      const fileReader = new FileReader();
      fileReader.onload = ({target: {result}}) => {
        resolve(result);
      };
  
      fileReader.readAsText(fileBlob);
    });
  }
  
  export function loadCsv(fileBlob, processor = processCsvData) {
    return readCSVFile(fileBlob).then(rawData => (rawData ? processor(rawData) : null));
  }
  
  function readJSONFile(fileBlob) {
    return new Promise((resolve, reject) => {
      const fileReader = new FileReader();
      fileReader.onload = ({target: {result}}) => {
        try {
          const json = JSON.parse(result);
          resolve(json);
        } catch (err) {
          resolve(null);
        }
      };
  
      fileReader.readAsText(fileBlob);
    });
  }
  
  export function isKeplerGlMap(json) {
    return (
      typeof json === 'object' &&
      json.datasets &&
      json.config &&
      json.info &&
      json.info.app === 'kepler.gl'
    );
  }
  
  export function determineJsonProcess(jsonData, defaultProcessor) {
    if (isKeplerGlMap(jsonData)) {
      return processKeplerglJSON;
    }
  
    return defaultProcessor;
  }
  
  export function loadJSON(fileBlob, processor = processGeojson) {
    return readJSONFile(fileBlob).then(rawData =>
      rawData ? determineJsonProcess(rawData, processor)(rawData) : null
    );
  }
  