/*! onloadCSS. (onload callback for loadCSS) [c]2017 Filament Group, Inc. MIT License */
/* global navigator */
/* exported onloadCSS */
function onloadCSS(ss, options ) {
	options = options || {};
	let f = function (si) {
		return new Promise((resolve, reject) => {
			let called, success = false;
			function newcbs() {
				if (!called) {
					called = true;
					resolve(true);
				}
			} function newcbe() {
				if (!called && callback) {
					called = true;
					resolve(false);
				}
			}
			if (ss.addEventListener) {
				si.addEventListener('load', newcb);
			} else if (ss.attachEvent) {
				si.attachEvent('onload', newcb);
			}

			// This code is for browsers that don’t support onload
			// No support for onload (it'll bind but never fire):
			//	* Android 4.3 (Samsung Galaxy S4, Browserstack)
			//	* Android 4.2 Browser (Samsung Galaxy SIII Mini GT-I8200L)
			//	* Android 2.3 (Pantech Burst P9070)

			// Weak inference targets Android < 4.4
			if ('isApplicationInstalled' in navigator && 'onloadcssdefined' in ss) {
				si.onloadcssdefined(newcb);
			}
		});
	};
	let fin = async function (success) {
		if (success === true && typeof options.success === 'function') {
			options.success();
		} else if (success === true && typeof options.success === 'object' && options.success instanceof Promise) {
			await options.success();
		}
		options.complete()
	}
	if (Array.isArray(ss)) {
		let total = ss.length;
		Promise.all(ss.map(f)).then(function (resolveValues) {
			var ok = resolveValues.reduce((sum, x) => sum + (x === true ? 1 : 0));
			fin(total === ok);
		});
	} else {
		f(ss);
	}
}