'use strict';

function inchesToCm(inches) {
	if (!inches) return null;

	return Math.round(Number(inches) * 2.54);
}

function feetInchesToCm(feet, inches) {
	if (!feet && !inches) return null;

	if (typeof feet === 'string' && !inches) {
		const [feetPart, inchesPart] = feet.match(/\d+/g);
		return feetInchesToCm(Number(feetPart), Number(inchesPart));
	}

	return Math.round((Number(feet) * 30.48) + ((Number(inches) || 0) * 2.54));
}

function cmToFeetInches(centimeters) {
	if (!centimeters) return null;

	const feet = Math.floor(centimeters / 30.48);
	const inches = Math.round((centimeters / 2.54) % (feet * 12));

	return { feet, inches };
}

function cmToInches(centimeters) {
	return centimeters / 2.54;
}

function heightToCm(height) {
	if (!height) return null;

	const [feet, inches] = height.match(/\d+/g);

	return feetInchesToCm(feet, inches);
}

function lbsToKg(lbs) {
	if (!lbs) return null;

	const pounds = lbs.toString().match(/\d+/)[0];

	return Math.round(Number(pounds) * 0.453592);
}

function kgToLbs(kgs) {
	if (!kgs) return null;

	const kilos = kgs.toString().match(/\d+/)[0];

	return Math.round(Number(kilos) / 0.453592);
}

module.exports = {
	cmToFeetInches,
	cmToInches,
	feetInchesToCm,
	heightToCm,
	inchesToCm,
	lbsToKg,
	kgToLbs,
};