var FFZ = window.FrankerFaceZ,
	constants = require('./constants');

module.exports = {
	update_css: function(element, id, css) {
		var all = element.innerHTML,
			start = "/*BEGIN " + id + "*/",
			end = "/*END " + id + "*/",
			s_ind = all.indexOf(start),
			e_ind = all.indexOf(end),
			found = s_ind !== -1 && e_ind !== -1 && e_ind > s_ind;

		if ( !found && !css )
			return;

		if ( found )
			all = all.substr(0, s_ind) + all.substr(e_ind + end.length);

		if ( css )
			all += start + css + end;

		element.innerHTML = all;
	},

	number_commas: function(x) {
		var parts = x.toString().split(".");
		parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
		return parts.join(".");
	}
}