const replace  = require("./replace");
const findRoot = require("./findRoot");
const getType  = require("./getType");

let param:number;
let type:string;
let rootParam:string;
const template:string = '<template root>'

const pxToRem = (file:string, rootSize:string ) :string => {
	if(rootSize){
		type = getType(rootSize).toLocaleLowerCase() || 'px';
		param = parseInt(rootSize.replace(type,'').trim());
	} else {
		const arg:string = findRoot.getParams(file);
		type = getType(arg).toLocaleLowerCase();
		param = parseInt(arg.replace(type,'').trim());
		rootParam = findRoot.getRoot();
		if(rootParam) file = file.replace(rootParam,template);
	}
	switch(type){
		case 'px':
			file = replace(file, param);
			if(rootParam) file = file.replace(template, rootParam);
			break;
		case '%':
			param = 16 * param / 100;
			file = replace(file, param);
			if(rootParam) file = file.replace(template, rootParam);
			break;
	}

	file = file.replace(/rem+[ \)|\)|\)\n]+{/ig,'em){')
	return file;
}

module.exports = pxToRem;