47 lines
1.6 KiB
TypeScript
47 lines
1.6 KiB
TypeScript
// Copyright 2017-2020 @polkadot/app-democracy authors & contributors
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// This software may be modified and distributed under the terms
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// of the Apache-2.0 license. See the LICENSE file for details.
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import BN from 'bn.js';
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import { useMemo } from 'react';
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import { useApi } from '@polkadot/react-hooks';
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import { BN_ONE, extractTime } from '@polkadot/util';
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import { useTranslation } from './translate';
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type Result = [number, string];
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const DEFAULT_TIME = new BN(6000);
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export default function useBlockTime (blocks = BN_ONE): Result {
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const { t } = useTranslation();
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const { api } = useApi();
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return useMemo(
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(): Result => {
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const blockTime = (
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api.consts.babe?.expectedBlockTime ||
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api.consts.difficulty?.targetBlockTime ||
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api.consts.timestamp?.minimumPeriod.muln(2) ||
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DEFAULT_TIME
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);
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const { days, hours, minutes, seconds } = extractTime(blockTime.mul(blocks).toNumber());
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const timeStr = [
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days ? (days > 1) ? t<string>('{{days}} days', { replace: { days } }) : t<string>('1 day') : null,
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hours ? (hours > 1) ? t<string>('{{hours}} hrs', { replace: { hours } }) : t<string>('1 hr') : null,
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minutes ? (minutes > 1) ? t<string>('{{minutes}} mins', { replace: { minutes } }) : t<string>('1 min') : null,
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seconds ? (seconds > 1) ? t<string>('{{seconds}} s', { replace: { seconds } }) : t<string>('1 s') : null
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]
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.filter((value): value is string => !!value)
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.slice(0, 2)
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.join(' ');
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return [
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blockTime.toNumber(),
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timeStr
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];
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},
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[api, blocks, t]
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);
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}
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