'use strict';

const { convert, convertMany } = require('convert');
const { decode } = require('html-entities');

const logger = require('../logger')(__filename);

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);
}

function curateConvertInput(string) {
	if (/['’]|(fe*o*t)/.test(string)) {
		const result = string.match(/(\d+).*?(\d+)/);

		if (result) {
			return `${result[1]}ft ${result[2]}in`;
		}
	}

	return string;
}

function convertManyApi(input, to) {
	const curatedInput = curateConvertInput(input);

	return Math.round(convertMany(curatedInput).to(to)) || null;
}

function convertApi(rawInput, fromOrTo, to) {
	if (!rawInput) {
		return null;
	}

	const input = decode(rawInput); // remove html entities, e.g. 5' 8" for 5' 8"

	try {
		if (typeof input === 'string' && to === undefined) {
			return convertManyApi(input, fromOrTo);
		}

		const inputNumber = Number(typeof input === 'string' ? input.match(/\d+(\.\d+)?/)?.[0] : input);

		return Math.round(convert(inputNumber, fromOrTo).to(to)) || null;
	} catch (error) {
		logger.error(error);
		return null;
	}
}

function maleFeetUsToEu(input) {
	if (!input) {
		return null;
	}

	const size = Number(input.toString().match(/\d+(\.\d+)?/)?.[0]);

	return Math.round((1.27 * size + 29.94) / 0.5) * 0.5; // round to nearest half
}

function femaleFeetUsToEu(input) {
	if (!input) {
		return null;
	}

	const size = Number(input.toString().match(/\d+(\.\d+)?/)?.[0]);

	// return Math.round((1.27 * size + 28.67) / 0.5) * 0.5; // round to nearest half
	return Math.round(1.27 * size + 28.67);
}

module.exports = {
	cmToFeetInches,
	cmToInches,
	feetInchesToCm,
	heightToCm,
	inchesToCm,
	lbsToKg,
	kgToLbs,
	maleFeetUsToEu,
	femaleFeetUsToEu,
	convert: convertApi,
};