import MultiGeometry, { MultiGeometryCreateCoordinates } from './MultiGeometry';
import Marker, { MarkerCoordinatesType, MarkerOptionsType } from './Marker';
import Coordinate from '../geo/Coordinate';
import Position from '../geo/Position';

/**
 * @classdesc
 * Represents a Geometry type of MultiPoint.
 * @category geometry
 * @extends MultiGeometry
 * @example
 * var multiPoint = new MultiPoint(
 *     [
 *         [121.5080881906138, 31.241128104458117],
 *         [121.50804527526954, 31.237238340103413],
 *         [121.5103728890997, 31.23888972560888]
 *     ]
 * ).addTo(layer);
 */
class MultiPoint extends MultiGeometry {

    /**
     * @param {Number[][]|Coordinate[]|Marker[]} data - construct data, coordinates or an array of markers
     * @param {Object} [options=null] - options defined in [nMultiPoint]{@link MultiPoint#options}
     */
    constructor(data: Array<MarkerCoordinatesType>, opts?: MarkerOptionsType) {
        super(Marker, 'MultiPoint', data as MultiGeometryCreateCoordinates, opts);
    }

    /**
     * 找到给定坐标的最近点
     * @english
     * Find the closet point to the give coordinate
     * @param {Coordinate} coordinate coordinate
     * @returns {Coordinate} coordinate
     */
    findClosest(coordinate: Coordinate): Coordinate {
        if (!coordinate) {
            return null;
        }
        const coords = this.getCoordinates();
        let hit = null;
        let max = Infinity;
        coords.forEach(c => {
            const dist = distanceTo(c, coordinate);
            if (dist < max) {
                hit = c;
                max = dist;
            }
        });
        return hit;
    }
}

MultiPoint.registerJSONType('MultiPoint');

export default MultiPoint;

function distanceTo(p0: Position, p1: Position): number {
    const x = p1.x - p0.x,
        y = p1.y - p0.y;
    return Math.sqrt(x * x + y * y);
}