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

export interface HereOptions extends GeocoderOptions {
  /**
   * Use `apiKey` and the new `HEREv2` geocoder
   * @deprecated
   */
  app_id: string;
  /**
   * Use `apiKey` and the new `HEREv2` geocoder
   * @deprecated
   */
  app_code: string;
  reverseGeocodeProxRadius?: any;
  apiKey: string;
  maxResults: number;
}

/**
 * Implementation of the [HERE Geocoder API](https://developer.here.com/documentation/geocoder/topics/introduction.html)
 */
export class HERE implements IGeocoder {
  options: HereOptions = {
    serviceUrl: 'https://geocoder.api.here.com/6.2/',
    app_id: '',
    app_code: '',
    apiKey: '',
    maxResults: 5
  };

  constructor(options?: Partial<HereOptions>) {
    L.Util.setOptions(this, options);
    if (options.apiKey) throw Error('apiKey is not supported, use app_id/app_code instead!');
  }

  geocode(query: string, cb: GeocodingCallback, context?: any): void {
    const params = geocodingParams(this.options, {
      searchtext: query,
      gen: 9,
      app_id: this.options.app_id,
      app_code: this.options.app_code,
      jsonattributes: 1,
      maxresults: this.options.maxResults
    });
    this.getJSON(this.options.serviceUrl + 'geocode.json', params, cb, context);
  }

  reverse(location: L.LatLngLiteral, scale: number, cb: GeocodingCallback, context?: any): void {
    let prox = location.lat + ',' + location.lng;
    if (this.options.reverseGeocodeProxRadius) {
      prox += ',' + this.options.reverseGeocodeProxRadius;
    }
    const params = reverseParams(this.options, {
      prox,
      mode: 'retrieveAddresses',
      app_id: this.options.app_id,
      app_code: this.options.app_code,
      gen: 9,
      jsonattributes: 1,
      maxresults: this.options.maxResults
    });
    this.getJSON(this.options.serviceUrl + 'reversegeocode.json', params, cb, context);
  }

  getJSON(url: string, params: any, cb: GeocodingCallback, context?: any) {
    getJSON(url, params, data => {
      const results: GeocodingResult[] = [];

      if (data.response.view && data.response.view.length) {
        for (let i = 0; i <= data.response.view[0].result.length - 1; i++) {
          const loc = data.response.view[0].result[i].location;
          const center = L.latLng(loc.displayPosition.latitude, loc.displayPosition.longitude);
          const bbox = L.latLngBounds(
            L.latLng(loc.mapView.topLeft.latitude, loc.mapView.topLeft.longitude),
            L.latLng(loc.mapView.bottomRight.latitude, loc.mapView.bottomRight.longitude)
          );
          results[i] = {
            name: loc.address.label,
            properties: loc.address,
            bbox: bbox,
            center: center
          };
        }
      }
      cb.call(context, results);
    });
  }
}

/**
 * Implementation of the new [HERE Geocoder API](https://developer.here.com/documentation/geocoding-search-api/api-reference-swagger.html)
 */
export class HEREv2 implements IGeocoder {
  options: HereOptions = {
    serviceUrl: 'https://geocode.search.hereapi.com/v1',
    apiKey: '',
    app_id: '',
    app_code: '',
    maxResults: 10
  };

  constructor(options?: Partial<HereOptions>) {
    L.Util.setOptions(this, options);
  }

  geocode(query: string, cb: GeocodingCallback, context?: any): void {
    const params = geocodingParams(this.options, {
      q: query,
      apiKey: this.options.apiKey,
      limit: this.options.maxResults
    });

    if (!params.at && !params.in) {
      throw Error(
        'at / in parameters not found. Please define coordinates (at=latitude,longitude) or other (in) in your geocodingQueryParams.'
      );
    }

    this.getJSON(this.options.serviceUrl + '/discover', params, cb, context);
  }

  reverse(location: L.LatLngLiteral, scale: number, cb: GeocodingCallback, context?: any): void {
    const params = reverseParams(this.options, {
      at: location.lat + ',' + location.lng,
      limit: this.options.reverseGeocodeProxRadius,
      apiKey: this.options.apiKey
    });
    this.getJSON(this.options.serviceUrl + '/revgeocode', params, cb, context);
  }

  getJSON(url: string, params: any, cb: GeocodingCallback, context?: any) {
    getJSON(url, params, data => {
      const results: GeocodingResult[] = [];

      if (data.items && data.items.length) {
        for (let i = 0; i <= data.items.length - 1; i++) {
          const item = data.items[i];
          const latLng = L.latLng(item.position.lat, item.position.lng);
          let bbox: L.LatLngBounds;
          if (item.mapView) {
            bbox = L.latLngBounds(
              L.latLng(item.mapView.south, item.mapView.west),
              L.latLng(item.mapView.north, item.mapView.east)
            );
          } else {
            // Using only position when not provided
            bbox = L.latLngBounds(
              L.latLng(item.position.lat, item.position.lng),
              L.latLng(item.position.lat, item.position.lng)
            );
          }
          results[i] = {
            name: item.address.label,
            properties: item.address,
            bbox: bbox,
            center: latLng
          };
        }
      }
      cb.call(context, results);
    });
  }
}

/**
 * [Class factory method](https://leafletjs.com/reference.html#class-class-factories) for {@link HERE}
 * @param options the options
 */
export function here(options?: Partial<HereOptions>) {
  if (options.apiKey) {
    return new HEREv2(options);
  } else {
    return new HERE(options);
  }
}