import invariant from "tiny-invariant";
import { TickMath } from "./tickMath";

/**
 * Returns the closest tick that is nearest a given tick and usable for the given tick spacing
 * @param tick the target tick
 * @param tickSpacing the spacing of the pool
 */
export function nearestUsableTick(tick: number, tickSpacing: number) {
  invariant(
    Number.isInteger(tick) && Number.isInteger(tickSpacing),
    "INTEGERS"
  );
  invariant(tickSpacing > 0, "TICK_SPACING");
  invariant(
    tick >= TickMath.MIN_TICK && tick <= TickMath.MAX_TICK,
    "TICK_BOUND"
  );
  const rounded = Math.round(tick / tickSpacing) * tickSpacing;
  if (rounded < TickMath.MIN_TICK) return rounded + tickSpacing;
  else if (rounded > TickMath.MAX_TICK) return rounded - tickSpacing;
  else return rounded;
}