import type { Coordinate } from 'ol/coordinate'
import { Geometry } from 'ol/geom'

export interface Options {
  tension?: number;
  rsolution?: number;
  pointsPerSeg?: number;
}

/** Calculate cspline on coordinates
 * @param {Array<Coordinate>} line
 * @param {} options
 *  @param {Number} options.tension a [0,1] number / can be interpreted as the "length" of the tangent, default 0.5
 *  @param {Number} options.resolution size of segment to split
 *  @param {Integer} options.pointsPerSeg number of points per segment to add if no resolution is provided, default add 10 points per segment
 * @return {Array<Coordinate>}
 */
export default function ol_coordinate_cspline(line: Coordinate[], options?: Options): Coordinate[]

declare module 'ol/geom' {
  interface Geometry {
    /** Cache cspline calculation on a geometry
     * @param {} options
     *  @param {Number} options.tension a [0,1] number / can be interpreted as the "length" of the tangent, default 0.5
     *  @param {Number} options.resolution size of segment to split
     *  @param {Integer} options.pointsPerSeg number of points per segment to add if no resolution is provided, default add 10 points per segment
     * @return {Geometry}
     */
    cspline(options?: Options): Geometry;
  }
}