'use strict';

const memoizee = require("memoizee");

const setTextStyles = require("./set-text-styles");
//const measureFont = memoizee(require("./measure-font"));
const measureFont = memoizee(require("measure-font"));

module.exports = function measureText(text, options) {
	let offscreenCanvas = document.createElement("canvas");
	let context = offscreenCanvas.getContext("2d");

	setTextStyles(context, options);

	let fontMeasurements = measureFont(options.fontFamily);

	return Object.assign(context.measureText(text), {
		/* FIXME: The following is a dirty hack until the Canvas v5 API is
		 *        widely supported in major browsers. The 1.13 multiplier comes
		 *        from the fabric.js source code - don't ask me why it's 1.13.
		 *        See also:
		 *        https://kangax.github.io/jstests/canvas-v5/
		 *        https://lists.w3.org/Archives/Public/public-whatwg-archive/2012Mar/0269.htm
		 */
		//height: options.fontSize * 1.13,
		height: options.fontSize * (fontMeasurements.descender - fontMeasurements.topBounding),
		ascender: options.fontSize * fontMeasurements.ascender,
		descender: options.fontSize * fontMeasurements.descender,
		capHeight: options.fontSize * fontMeasurements.capHeight,
		median: options.fontSize * fontMeasurements.median,
		topBounding: options.fontSize * fontMeasurements.topBounding,
	});
}