32 lines
994 B
TypeScript
32 lines
994 B
TypeScript
// Copyright 2017-2021 @polkadot/app-democracy authors & contributors
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
import type { VoteThreshold } from '@polkadot/types/interfaces';
|
|
|
|
import BN from 'bn.js';
|
|
import { useEffect, useState } from 'react';
|
|
|
|
import { useApi, useCall } from '@polkadot/react-hooks';
|
|
import { BN_ZERO } from '@polkadot/util';
|
|
|
|
import { approxChanges } from './util';
|
|
|
|
interface Result {
|
|
changeAye: BN;
|
|
changeNay: BN;
|
|
}
|
|
|
|
export default function useChangeCalc (threshold: VoteThreshold, votedAye: BN, votedNay: BN, votedTotal: BN): Result {
|
|
const { api } = useApi();
|
|
const sqrtElectorate = useCall<BN>(api.derive.democracy.sqrtElectorate);
|
|
const [result, setResult] = useState<Result>({ changeAye: BN_ZERO, changeNay: BN_ZERO });
|
|
|
|
useEffect((): void => {
|
|
sqrtElectorate && setResult(
|
|
approxChanges(threshold, sqrtElectorate, { votedAye, votedNay, votedTotal })
|
|
);
|
|
}, [sqrtElectorate, threshold, votedAye, votedNay, votedTotal]);
|
|
|
|
return result;
|
|
}
|