import { Coordinate } from 'ol/coordinate'
import { Extent } from 'ol/extent'
import Circle from 'ol/geom/Circle'
import GeometryLayout from 'ol/geom/GeometryLayout'
import LineString from 'ol/geom/LineString'
import Point from 'ol/geom/Point'
import Polygon from 'ol/geom/Polygon'

/**
 * 创建点对象
 * @param coordinate 坐标
 * @param optLayout 配置项
 */
export function createPoint (coordinate: Coordinate, optLayout?: GeometryLayout) : Point {
  return new Point(coordinate, optLayout)
}

/**
 * 创建线对象
 * @param coordinates 坐标集合
 * @param optLayout 配置项
 */
export function createLineString (coordinates: Coordinate[], optLayout?: GeometryLayout) : LineString {
  return new LineString(coordinates, optLayout)
}

/**
 * 创建面对象
 * @param coordinates 坐标集合
 * @param optLayout 配置项
 * @param optEnds 配置项
 */
export function createPolygon (coordinates: Coordinate[][], optLayout?: GeometryLayout, optEnds?: number[]) : Polygon {
  return new Polygon(coordinates, optLayout, optEnds)
}

/**
 * 创建圆对象
 * @param center 圆心坐标
 * @param radius 圆半径
 * @param optLayout 配置项
 */
export function createCircle (center: Coordinate, radius: number, optLayout?: GeometryLayout) : Circle {
  return new Circle(center, radius, optLayout)
}

/**
 * 创建范围对象
 * @param bounds 范围坐标集合
 */
export function createExtent (bounds: [number, number, number, number]): Extent {
  const [xmin, ymin, xmax, ymax] = bounds
  const polygon = createPolygon([[
    [xmin, ymin], [xmin, ymax], [xmax, ymax], [xmax, ymin]
  ]])
  return polygon.getExtent()
}