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