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import {Injectable, provide} from 'angular2/core';
import {Observable} from 'rxjs';

const GEOLOCATION_ERRORS = {
	'errors.location.unsupportedBrowser': 'Browser does not support location services',
	'errors.location.permissionDenied': 'You have rejected access to your location',
	'errors.location.positionUnavailable': 'Unable to determine your location',
	'errors.location.timeout': 'Service timeout has been reached'
};

@Injectable()
export class GeolocationService {

	/**
	 * Obtains the geographic position, in terms of latitude and longitude coordinates, of the device.
	 * @param {Object} [opts] An object literal to specify one or more of the following attributes and desired values:
	 *   - enableHighAccuracy: Specify true to obtain the most accurate position possible, or false to optimize in favor of performance and power consumption.
	 *   - timeout: An Integer value that indicates the time, in milliseconds, allowed for obtaining the position.
	 *              If timeout is Infinity, (the default value) the location request will not time out.
	 *              If timeout is zero (0) or negative, the results depend on the behavior of the location provider.
	 *   - maximumAge: An Integer value indicating the maximum age, in milliseconds, of cached position information.
	 *                 If maximumAge is non-zero, and a cached position that is no older than maximumAge is available, the cached position is used instead of obtaining an updated location.
	 *                 If maximumAge is zero (0), watchPosition always tries to obtain an updated position, even if a cached position is already available.
	 *                 If maximumAge is Infinity, any cached position is used, regardless of its age, and watchPosition only tries to obtain an updated position if no cached position data exists.
	 * @returns {Observable} An observable sequence with the geographical location of the device running the client.
	 */
	public getLocation(opts): Observable<any> {

		return Observable.create(observer => {

			if (window.navigator && window.navigator.geolocation) {
				window.navigator.geolocation.getCurrentPosition(
					(position) => {
						observer.next(position);
            observer.complete();
					},
					(error) => {
						switch (error.code) {
							case 1:
								observer.error(GEOLOCATION_ERRORS['errors.location.permissionDenied']);
								break;
							case 2:
								observer.error(GEOLOCATION_ERRORS['errors.location.positionUnavailable']);
								break;
							case 3:
								observer.error(GEOLOCATION_ERRORS['errors.location.timeout']);
								break;
						}
					},
					opts);
			}
			else {
				observer.error(GEOLOCATION_ERRORS['errors.location.unsupportedBrowser']);
			}

		});



	}
}

export var geolocationServiceInjectables: Array<any> = [
  provide(GeolocationService, { useClass: GeolocationService })
];