text: // @flow
  // Copyright (c) 2015 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 * as React from 'react';
  import {PureComponent, cloneElement} from 'react';
  import PropTypes from 'prop-types';
  import MapContext from './map-context';
  import assert from '../utils/assert';
  import deepEqual from '../utils/deep-equal';
  
  import type {MapContextProps} from './map-context';
  
  const propTypes = {
    type: PropTypes.string.isRequired,
    id: PropTypes.string
  };
  
  type SourceProps = {
    id?: string,
    type: string,
    children?: any
  };
  
  let sourceCounter = 0;
  
  export default class Source<Props: SourceProps> extends PureComponent<Props> {
    static propTypes = propTypes;
  
    constructor(props: Props) {
      super(props);
      this.id = props.id || `jsx-source-${sourceCounter++}`;
      this.type = props.type;
    }
  
    componentWillUnmount() {
      /* global requestAnimationFrame */
      // Do not remove source immediately because the
      // dependent <Layer>s' componentWillUnmount() might not have been called
      // Removing source before dependent layers will throw error
      // TODO - find a more robust solution
      const map = this._map;
      if (map) {
        map.off('styledata', this._updateSource);
        requestAnimationFrame(() => {
          if (map.style && map.style._loaded) {
            map.removeSource(this.id);
          }
        });
      }
    }
  
    id: string;
    type: string;
    _map: any = null;
    _sourceOptions: any = {};
  
    getSource() {
      const map = this._map;
      return map && map.style && map.getSource(this.id);
    }
  
    _createSource(sourceOptions: any) {
      const map = this._map;
      if (map.style && map.style._loaded) {
        map.addSource(this.id, sourceOptions);
      }
    }
  
    /* eslint-disable complexity */
    _updateSource = () => {
      const {type, _map: map} = this;
      if (!map) {
        return;
      }
  
      const {_sourceOptions: sourceOptions, props} = this;
      assert(!props.id || props.id === this.id, 'source id changed');
      assert(props.type === type, 'source type changed');
  
      let changedKey = '';
      let changedKeyCount = 0;
  
      for (const key in props) {
        if (key !== 'children' && key !== 'id' && !deepEqual(sourceOptions[key], props[key])) {
          sourceOptions[key] = props[key];
          changedKey = key;
          changedKeyCount++;
        }
      }
  
      const source = this.getSource();
      if (!source) {
        this._createSource(sourceOptions);
        return;
      }
      if (!changedKeyCount) {
        return;
      }
      if (type === 'geojson') {
        source.setData(sourceOptions.data);
      } else if (type === 'image') {
        source.updateImage({url: sourceOptions.url, coordinates: sourceOptions.coordinates});
      } else if (
        (type === 'canvas' || type === 'video') &&
        changedKeyCount === 1 &&
        changedKey === 'coordinates'
      ) {
        source.setCoordinates(sourceOptions.coordinates);
      } else if (type === 'vector' && source.setUrl) {
        // Added in 1.12.0:
        // vectorTileSource.setTiles
        // vectorTileSource.setUrl
        switch (changedKey) {
          case 'url':
            source.setUrl(sourceOptions.url);
            break;
          case 'tiles':
            source.setTiles(sourceOptions.tiles);
            break;
          default:
        }
      } else {
        // eslint-disable-next-line
        console.warn(`Unable to update <Source> prop: ${changedKey}`);
      }
    };
    /* eslint-enable complexity */
  
    _render(context: MapContextProps) {
      if (!this._map && context.map) {
        this._map = context.map;
        this._map.on('styledata', this._updateSource);
      }
      this._updateSource();
      return React.Children.map(
        this.props.children,
        child =>
          child &&
          cloneElement(child, {
            source: this.id
          })
      );
    }
  
    render() {
      return <MapContext.Consumer>{this._render.bind(this)}</MapContext.Consumer>;
    }
  }
  