// numberFormat.js
// ---------------
// A simple tool to automagically format numbers for you using the Intl API
//
// Usage:
// ------
// Just wrap the numbers you want formatted in '<num>' '</num>' tags
// add the script in your document head wiht defer set

// COMING SOON :
// -------------
// Support for currency formatting :)

//The MIT License (MIT)

//Copyright (c) 2022 Robert Morrison <sherlock5512>

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in all
//copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//SOFTWARE.

// No, I will not add a LibreJS compatible comment
// GNU won't support my choice of browser so I won't support their tool

// constant arrays to keep data validated
const currencyDisplays = ['symbol','narrowSymbol','code','name']

function formatNumbers() {

	const numbers = document.getElementsByTagName("num");
	const documentLanguage = document.documentElement.lang;
	var formatter = Intl.NumberFormat(documentLanguage);

	for (let num  of numbers) {
		var number = parseFloat(num.innerHTML);

		if (isNaN(number)) {
			console.error("[numberFormat.js] ERROR: cannot parse num element: ");
			console.error(num);
			continue;
		}

		if (num.attributes.currency) {
			var f = _createCurrencyFormatter(num,documentLanguage);
			if (f !== undefined) {
				formatter = f;
			}
		}

		var formatted = formatter.format(number);
		num.innerHTML = formatted;
	}
}

function _createCurrencyFormatter(num,documentLanguage) {
	var currency;
	var currencyDisplay;
	var currencyData = num.attributes.currency.value.split('-');
	currency = currencyData[0];
	if (currencyDisplays.includes(currencyData[1])) {
		currencyDisplay = currencyData[1];
	}
	else {
		currencyDisplay = "symbol"
	}
	try {
		formatter = Intl.NumberFormat(documentLanguage,{
			style: 'currency',
			currency: currency,
			currencyDisplay: currencyDisplay,})
		return formatter;
	} catch (error) {
		console.error("[numberFormat.js] ERROR: Failed to create NumberFormat");
		console.error(` - Check that ${currency} is a currency code`);
		console.error(num)
	}
	return undefined;
}

// ENTRY POINT
formatNumbers();