import { Point } from './point'
import { Rectangle } from './rectangle'

export namespace GeometryUtil {
  export function round(num: number, precision = 0) {
    return Number.isInteger(num) ? num : +num.toFixed(precision)
  }

  export function random(): number
  export function random(max: number): number
  export function random(min: number, max: number): number
  export function random(min?: number, max?: number): number {
    let mmin
    let mmax

    if (max == null) {
      mmax = min == null ? 1 : min
      mmin = 0
    } else {
      mmax = max
      mmin = min == null ? 0 : min
    }

    if (mmax < mmin) {
      const temp = mmin
      mmin = mmax
      mmax = temp
    }

    return Math.floor(Math.random() * (mmax - mmin + 1) + mmin)
  }

  export function clamp(value: number, min: number, max: number) {
    if (Number.isNaN(value)) {
      return NaN
    }

    if (Number.isNaN(min) || Number.isNaN(max)) {
      return 0
    }

    return min < max
      ? value < min
        ? min
        : value > max
        ? max
        : value
      : value < max
      ? max
      : value > min
      ? min
      : value
  }

  export function snapToGrid(value: number, gridSize: number) {
    return gridSize * Math.round(value / gridSize)
  }

  export function containsPoint(
    rect: Rectangle.RectangleLike,
    point: Point.PointLike,
  ) {
    return (
      point != null &&
      rect != null &&
      point.x >= rect.x &&
      point.x <= rect.x + rect.width &&
      point.y >= rect.y &&
      point.y <= rect.y + rect.height
    )
  }

  export function squaredLength(p1: Point.PointLike, p2: Point.PointLike) {
    const dx = p1.x - p2.x
    const dy = p1.y - p2.y
    return dx * dx + dy * dy
  }
}
