/**
 * 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 { useContracts } from "../../useContracts/useContracts";
import { useWeb3Provider } from "../../useWeb3Provider/useWeb3Provider";
import { bigNumAsInt, wait } from "../../../utils";
import { UserPosition } from "../../../state";

export const usePollForNewPosition = () => {
  const { fetchUserPosition, userPositionsArray } = useUserPositions();
  const { reliquary } = useContracts();
  const { account } = useWeb3Provider();

  const poll = async (): Promise<UserPosition> => {
    const numberOfPositions = bigNumAsInt(await reliquary.balanceOf(account!));
    if (numberOfPositions > userPositionsArray.length) {
      const newTokenId = await reliquary.tokenOfOwnerByIndex(
        account!,
        numberOfPositions - 1
      );
      const newPosition = await fetchUserPosition(bigNumAsInt(newTokenId));
      if (!newPosition) {
        console.warn("Position not found, retrying...");
        await wait(3000);
        return poll();
      }
      return newPosition;
    }
    await wait(3000);
    return poll();
  };

  return poll;
};