import type { Coordinate } from 'ol/coordinate'
import type Feature from 'ol/Feature'
import type { Point, Polygon } from 'ol/geom'
import type { Options as VectorSourceOptions } from 'ol/source/Vector'
import type VectorSource from 'ol/source/Vector'
import type HexagonLayout from '../render/HexGrid'
import { BinBase } from './BinBase'

export interface Options extends VectorSourceOptions<Feature> {
  source?: VectorSource;
  size?: number;
  origin?: Coordinate;
  layout?: HexagonLayout;
  geometryFunction?: (f: Feature) => Point;
  flatAttributes?: (bin: Feature, features: Feature[]) => void;
}

/** A source for hexagonal binning
 * @constructor
 * @extends {ol.source.Vector}

 */
export default class HexBin extends BinBase {
  /**
   * @param {Object} options ol_source_VectorOptions + ol.HexGridOptions
   *  @param {ol.source.Vector} options.source Source
   *  @param {number} [options.size] size of the hexagon in map units, default 80000
   *  @param {ol.coordinate} [options.origin] origin of the grid, default [0,0]
   *  @param {HexagonLayout} [options.layout] grid layout, default pointy
   *  @param {function} [options.geometryFunction] Function that takes an ol.Feature as argument and returns an ol.geom.Point as feature's center.
   *  @param {function} [options.flatAttributes] Function takes a bin and the features it contains and aggragate the features in the bin attributes when saving
   */
  constructor(options?: Options);

  /** Get the hexagon geometry at the coord
   * @param {Coordinate} coord
   * @returns {Polygon}
   * @api
   */
  getGridGeomAt(coord: Coordinate): Polygon;

  /**  Set the inner HexGrid size.
   *  @param {number} newSize
   *  @param {boolean} noreset If true, reset will not be called (It need to be called through)
   */
  setSize(newSize: number, noreset: boolean): void;

  /**  Get the inner HexGrid size.
   *  @return {number}
   */
  getSize(): number;

  /**  Set the inner HexGrid layout.
   *  @param {import('../render/HexGrid').HexagonLayout} newLayout
   *  @param {boolean} noreset If true, reset will not be called (It need to be called through)
   */
  setLayout(newLayout: HexagonLayout, noreset: boolean): void;

  /**  Get the inner HexGrid layout.
   */
  getLayout(): HexagonLayout;

  /**  Set the inner HexGrid origin.
   *  @param {Coordinate} newLayout
   *  @param {boolean} noreset If true, reset will not be called (It need to be called through)
   */
  setOrigin(newLayout: Coordinate, noreset: boolean): void;

  /**  Get the inner HexGrid origin.
   *  @return {Coordinate}
   */
  getOrigin(): Coordinate;

  /**
   * Get hexagons without circular dependencies (vs. getFeatures)
   * @return {Array<Feature>}
   */
  getHexFeatures(): Feature[];

  /** Overwrite Vector clear to fire clearstart / clearend event
   */
  clear(): void;
}