import { clamp } from "@noya-app/noya-utils";

const ZOOM_LEVELS = [
  0.015625, 0.03125, 0.0625, 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256,
];

export type ZoomRange = [number, number];

function nearestLevel(zoom: number) {
  return ZOOM_LEVELS.reduce((prev, curr) =>
    Math.abs(curr - zoom) < Math.abs(prev - zoom) ? curr : prev
  );
}

const min = ZOOM_LEVELS[0];
const max = ZOOM_LEVELS[ZOOM_LEVELS.length - 1];

export const Zoom = {
  min,
  max,
  range: [min, max] satisfies ZoomRange,
  nearestLevel,
  clamp: (zoom: number) => clamp(zoom, Zoom.min, Zoom.max),
};