/**
 * A hook that polls for the user's balance to increase, fetching the new position when
 * it does.  This is an unfortunate alternative to listening for the Transfer event to confirm the
 * position is opened as we seem to occasionally miss this event - see issues raised in Ethers.js
 */
import { useUserPositions } from "../useUserPositions/useUserPositions";
import { wait } from "../../../utils";
import { UserPosition } from "../../../state";

type PositionDidChange = (position: UserPosition) => boolean;

export const usePollForPositionChange = (positionId: number) => {
  const { fetchUserPosition } = useUserPositions();

  const poll = async (
    positionDidChange: PositionDidChange
  ): Promise<UserPosition> => {
    const position = await fetchUserPosition(positionId);
    if (position && positionDidChange(position)) {
      return position;
    }
    await wait(3000);
    return poll(positionDidChange);
  };

  return poll;
};