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import React from 'react';
import { injectIntl, defineMessages } from 'react-intl';
import PropTypes from 'prop-types';
const messages = defineMessages({
just_now: { id: 'relative_time.just_now', defaultMessage: 'now' },
seconds: { id: 'relative_time.seconds', defaultMessage: '{number}s' },
minutes: { id: 'relative_time.minutes', defaultMessage: '{number}m' },
hours: { id: 'relative_time.hours', defaultMessage: '{number}h' },
days: { id: 'relative_time.days', defaultMessage: '{number}d' },
});
const dateFormatOptions = {
hour12: false,
year: 'numeric',
month: 'short',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
};
const shortDateFormatOptions = {
month: 'numeric',
day: 'numeric',
};
const SECOND = 1000;
const MINUTE = 1000 * 60;
const HOUR = 1000 * 60 * 60;
const DAY = 1000 * 60 * 60 * 24;
const MAX_DELAY = 2147483647;
const selectUnits = delta => {
const absDelta = Math.abs(delta);
if (absDelta < MINUTE) {
return 'second';
} else if (absDelta < HOUR) {
return 'minute';
} else if (absDelta < DAY) {
return 'hour';
}
return 'day';
};
const getUnitDelay = units => {
switch (units) {
case 'second':
return SECOND;
case 'minute':
return MINUTE;
case 'hour':
return HOUR;
case 'day':
return DAY;
default:
return MAX_DELAY;
}
};
@injectIntl
export default class RelativeTimestamp extends React.Component {
static propTypes = {
intl: PropTypes.object.isRequired,
timestamp: PropTypes.string.isRequired,
};
state = {
now: this.props.intl.now(),
};
shouldComponentUpdate (nextProps, nextState) {
// As of right now the locale doesn't change without a new page load,
// but we might as well check in case that ever changes.
return this.props.timestamp !== nextProps.timestamp ||
this.props.intl.locale !== nextProps.intl.locale ||
this.state.now !== nextState.now;
}
componentWillReceiveProps (nextProps) {
if (this.props.timestamp !== nextProps.timestamp) {
this.setState({ now: this.props.intl.now() });
}
}
componentDidMount () {
this._scheduleNextUpdate(this.props, this.state);
}
componentWillUpdate (nextProps, nextState) {
this._scheduleNextUpdate(nextProps, nextState);
}
componentWillUnmount () {
clearTimeout(this._timer);
}
_scheduleNextUpdate (props, state) {
clearTimeout(this._timer);
const { timestamp } = props;
const delta = (new Date(timestamp)).getTime() - state.now;
const unitDelay = getUnitDelay(selectUnits(delta));
const unitRemainder = Math.abs(delta % unitDelay);
const updateInterval = 1000 * 10;
const delay = delta < 0 ? Math.max(updateInterval, unitDelay - unitRemainder) : Math.max(updateInterval, unitRemainder);
this._timer = setTimeout(() => {
this.setState({ now: this.props.intl.now() });
}, delay);
}
render () {
const { timestamp, intl } = this.props;
const date = new Date(timestamp);
const delta = this.state.now - date.getTime();
let relativeTime;
if (delta < 10 * SECOND) {
relativeTime = intl.formatMessage(messages.just_now);
} else if (delta < 3 * DAY) {
if (delta < MINUTE) {
relativeTime = intl.formatMessage(messages.seconds, { number: Math.floor(delta / SECOND) });
} else if (delta < HOUR) {
relativeTime = intl.formatMessage(messages.minutes, { number: Math.floor(delta / MINUTE) });
} else if (delta < DAY) {
relativeTime = intl.formatMessage(messages.hours, { number: Math.floor(delta / HOUR) });
} else {
relativeTime = intl.formatMessage(messages.days, { number: Math.floor(delta / DAY) });
}
} else {
relativeTime = intl.formatDate(date, shortDateFormatOptions);
}
return (
<time dateTime={timestamp} title={intl.formatDate(date, dateFormatOptions)}>
{relativeTime}
</time>
);
}
}
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