import type { Coordinate } from 'ol/coordinate'
import type { Extent } from 'ol/extent'

export interface GeoHash {
  n: string;
  ne: string;
  e: string;
  se: string;
  s: string;
  sw: string;
  w: string;
  nw: string;
}

/** Encodes latitude/longitude to geohash, either to specified precision or to automatically
 * evaluated precision.
 * @param   {ol.coordinate} lonlat Longitude, Latitude in degrees.
 * @param   {number} [precision] Number of characters in resulting geohash.
 * @returns {string} Geohash of supplied latitude/longitude.
 */
declare function ol_geohash_fromLonLat(lonlat: Coordinate, precision?: number): string;

/** Decode geohash to latitude/longitude
 * (location is approximate centre of geohash cell, to reasonable precision).
 * @param   {string} geohash - Geohash string to be converted to latitude/longitude.
 * @return {ol.coordinate}
 */
declare function ol_geohash_toLonLat(geohash: string): Coordinate;

/** Returns SW/NE latitude/longitude bounds of specified geohash.
 * @param   {string} geohash Cell that bounds are required of.
 * @return {ol.extent | false}
 */
declare function ol_geohash_getExtent(geohash: string): Extent | false;

/** Determines adjacent cell in given direction.
 * @param   {string} geohash Geohash cel
 * @param   {string} direction direction as char : N/S/E/W.
 * @returns {string|false}
 */
declare function ol_geohash_getAdjacent(geohash: string, direction: 'N' | 'S' | 'E' | 'W'): string | false;

/** Returns all 8 adjacent cells to specified geohash.
 * @param   {string} geohash Geohash neighbours are required of.
 * @returns {{n,ne,e,se,s,sw,w,nw: string}}
 */
declare function ol_geohash_getNeighbours(geohash: string): GeoHash

export {
  ol_geohash_fromLonLat as fromLonLat,
  ol_geohash_toLonLat as toLonLat,
  ol_geohash_getExtent as getExtent,
  ol_geohash_getAdjacent as getAdjacent,
  ol_geohash_getNeighbours as getNeighbours,
}