import * as L from 'leaflet';
import { getJSON } from '../util';
import {
  IGeocoder,
  GeocoderOptions,
  GeocodingCallback,
  geocodingParams,
  GeocodingResult,
  reverseParams
} from './api';

export interface MapQuestOptions extends GeocoderOptions {}

/**
 * Implementation of the [MapQuest Geocoding API](http://developer.mapquest.com/web/products/dev-services/geocoding-ws)
 */
export class MapQuest implements IGeocoder {
  options: MapQuestOptions = {
    serviceUrl: 'https://www.mapquestapi.com/geocoding/v1'
  };

  constructor(options?: Partial<MapQuestOptions>) {
    L.Util.setOptions(this, options);
    // MapQuest seems to provide URI encoded API keys,
    // so to avoid encoding them twice, we decode them here
    this.options.apiKey = decodeURIComponent(this.options.apiKey);
  }

  _formatName(...parts: string[]) {
    return parts.filter(s => !!s).join(', ');
  }

  geocode(query: string, cb: GeocodingCallback, context?: any): void {
    const params = geocodingParams(this.options, {
      key: this.options.apiKey,
      location: query,
      limit: 5,
      outFormat: 'json'
    });
    getJSON(
      this.options.serviceUrl + '/address',
      params,
      L.Util.bind(function(data) {
        const results: GeocodingResult[] = [];
        if (data.results && data.results[0].locations) {
          for (let i = data.results[0].locations.length - 1; i >= 0; i--) {
            const loc = data.results[0].locations[i];
            const center = L.latLng(loc.latLng);
            results[i] = {
              name: this._formatName(loc.street, loc.adminArea4, loc.adminArea3, loc.adminArea1),
              bbox: L.latLngBounds(center, center),
              center: center
            };
          }
        }

        cb.call(context, results);
      }, this)
    );
  }

  reverse(location: L.LatLngLiteral, scale: number, cb: GeocodingCallback, context?: any): void {
    const params = reverseParams(this.options, {
      key: this.options.apiKey,
      location: location.lat + ',' + location.lng,
      outputFormat: 'json'
    });
    getJSON(
      this.options.serviceUrl + '/reverse',
      params,
      L.Util.bind(function(data) {
        const results: GeocodingResult[] = [];
        if (data.results && data.results[0].locations) {
          for (let i = data.results[0].locations.length - 1; i >= 0; i--) {
            const loc = data.results[0].locations[i];
            const center = L.latLng(loc.latLng);
            results[i] = {
              name: this._formatName(loc.street, loc.adminArea4, loc.adminArea3, loc.adminArea1),
              bbox: L.latLngBounds(center, center),
              center: center
            };
          }
        }

        cb.call(context, results);
      }, this)
    );
  }
}

/**
 * [Class factory method](https://leafletjs.com/reference.html#class-class-factories) for {@link MapQuest}
 * @param options the options
 */
export function mapQuest(options?: Partial<MapQuestOptions>) {
  return new MapQuest(options);
}