/**
* External dependencies
*/
import { usePrevious } from '@woocommerce/base-hooks';
/**
* Internal dependencies
*/
import { ROUND_UP, ROUND_DOWN } from './constants';
/**
* Return the price constraint.
*
* @param {number} price Price in minor unit, e.g. cents.
* @param {number} minorUnit Price minor unit (number of digits after the decimal separator).
* @param {ROUND_UP|ROUND_DOWN} direction Rounding flag whether we round up or down.
*/
export const usePriceConstraint = ( price, minorUnit, direction ) => {
const step = 10 * 10 ** minorUnit;
let currentConstraint;
if ( direction === ROUND_UP ) {
currentConstraint = isNaN( price )
? null
: Math.ceil( parseFloat( price, 10 ) / step ) * step;
} else if ( direction === ROUND_DOWN ) {
currentConstraint = isNaN( price )
? null
: Math.floor( parseFloat( price, 10 ) / step ) * step;
}
const previousConstraint = usePrevious(
currentConstraint,
Number.isFinite
);
return Number.isFinite( currentConstraint )
? currentConstraint
: previousConstraint;
};
export default ( { minPrice, maxPrice, minorUnit } ) => {
return {
minConstraint: usePriceConstraint( minPrice, minorUnit, ROUND_DOWN ),
maxConstraint: usePriceConstraint( maxPrice, minorUnit, ROUND_UP ),
};
};