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import React from 'react';
import PropTypes from 'prop-types';
import { FormattedNumber } from 'react-intl';
import TransitionMotion from 'react-motion/lib/TransitionMotion';
import spring from 'react-motion/lib/spring';
import { reduceMotion } from 'flavours/glitch/initial_state';
const obfuscatedCount = count => {
if (count < 0) {
return 0;
} else if (count <= 1) {
return count;
} else {
return '1+';
}
};
export default class AnimatedNumber extends React.PureComponent {
static propTypes = {
value: PropTypes.number.isRequired,
obfuscate: PropTypes.bool,
};
state = {
direction: 1,
};
componentWillReceiveProps (nextProps) {
if (nextProps.value > this.props.value) {
this.setState({ direction: 1 });
} else if (nextProps.value < this.props.value) {
this.setState({ direction: -1 });
}
}
willEnter = () => {
const { direction } = this.state;
return { y: -1 * direction };
}
willLeave = () => {
const { direction } = this.state;
return { y: spring(1 * direction, { damping: 35, stiffness: 400 }) };
}
render () {
const { value, obfuscate } = this.props;
const { direction } = this.state;
if (reduceMotion) {
return obfuscate ? obfuscatedCount(value) : <FormattedNumber value={value} />;
}
const styles = [{
key: `${value}`,
data: value,
style: { y: spring(0, { damping: 35, stiffness: 400 }) },
}];
return (
<TransitionMotion styles={styles} willEnter={this.willEnter} willLeave={this.willLeave}>
{items => (
<span className='animated-number'>
{items.map(({ key, data, style }) => (
<span key={key} style={{ position: (direction * style.y) > 0 ? 'absolute' : 'static', transform: `translateY(${style.y * 100}%)` }}>{obfuscate ? obfuscatedCount(data) : <FormattedNumber value={data} />}</span>
))}
</span>
)}
</TransitionMotion>
);
}
}
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