import { IFormatterNumberOptions } from "shared/model/types";

import { addParentheses } from "./addParentheses";

/**
 * @param {(number | null | undefined)} value Money amount to be formatted.
 * @param {Object} [options] Formatting options.
 * @param {boolean} [options.currencySymbol = ""] Currency symbol.
 * @param {number} [options.decimalPlaces = 2] Number of decimal places.
 * @param {string} [options.decimalSeparator = "."] Decimal separator.
 * @param {boolean} options.negativeClass Style class name for negative numbers.
 * @param {boolean} [options.negativeInParentheses = true] Enclose negative numbers in parentheses.
 * @param {boolean} [options.noHTML = false] Return plain text without HTML.
 * @param {boolean} options.positiveClass Style class name for positive numbers.
 * @param {string} [options.thousandsSeparator = ","] Thousands separator.
 * @param {boolean} [options.zeroAsBlank = false] Display zero as en empty string.
 * */
export function formatNumber(
	value: number | string | null | undefined,
	options: IFormatterNumberOptions = {},
): string {
	const {
		currencySymbol = "",
		decimalPlaces = 2,
		decimalSeparator = ".",
		negativeClass,
		negativeInParentheses = true,
		noHTML = false,
		positiveClass,
		thousandsSeparator = ",",
		zeroAsBlank = false,
	} = options;
	if (value === undefined || value === null || value === "") {
		return "";
	} else if (!Number(value) && zeroAsBlank) return "";
	const isNegative = (Number(value) || 0) < 0;
	const valueFixed = Math.abs(Number(value) || 0).toFixed(decimalPlaces);
	const integerPart = parseInt(valueFixed).toString();
	const remainder = integerPart.length > 3 ? integerPart.length % 3 : 0;
	const withThousandsSeparator =
		(remainder ? integerPart.slice(0, remainder) + thousandsSeparator : "") +
		integerPart
			.slice(remainder)
			.replace(/(\d{3})(?=\d)/g, `$1${thousandsSeparator}`);
	const withDecimalPlaces =
		withThousandsSeparator +
		(decimalPlaces ? decimalSeparator + valueFixed.slice(-decimalPlaces) : "");
	const withCurrency = `${currencySymbol}${withDecimalPlaces}`;
	const withMinus = isNegative ? `-${withCurrency}` : withCurrency;
	const withParentheses =
		isNegative && negativeInParentheses ? addParentheses(withMinus) : withMinus;
	if (noHTML) {
		return withParentheses;
	} else if (isNegative) {
		return negativeClass
			? `<span class="${negativeClass}">${withParentheses}</span>`
			: withParentheses;
	} else {
		return positiveClass
			? `<span class="${positiveClass}">${withParentheses}</span>`
			: withParentheses;
	}
}