/**
 * Custom written IE polyfill.
 * 
 * (c) 2020 ThemeSphere
 */
"use strict";

document.addEventListener("DOMContentLoaded", function(e) {

	// Not IE. Some other legacy browsers.
	if (!(/MSIE|Trident/.test(window.navigator.userAgent))) {

		// Just an extra check to prevent Safari 10 wrongly getting the ponyfill. 
		// It's bugged in the ponyfill.
		var _supportsFn  = (window.CSS && window.CSS.supports && window.CSS.supports.bind(window.CSS)) || (window.supportsCSS);
		var supportsVars = !!_supportsFn && (_supportsFn('--f:0') || _supportsFn('--f', 0));

		if (!supportsVars) {
			cssVars({
				preserveVars: false
			});
		}
	}
	else {
		_fixIEVars();
	}
});

var _fixIEVars = function() {

	// All the selectors containing var()s to replace.
	var validSelectors = [
		'.post-meta', '.the-post-header .post-meta.has-below',
		'.main-head', '.main-head.nav-below', '.main-head .inner',
		'.navigation', 
		'.navigation .menu > li > a',
		'.top-bar-content', '.top-bar.dark .top-bar-content',
		'.feat-grid-ratio .item-main:before'
	]

	// Vars to replace with IE readable vars. Should be non-root generally. These won't be replaced by ponyfill.
	var autoVars = [
		// 'post-meta-mb', 'post-meta', 'grad-opacity', 
		// 'topbar-dark-bg',
		// 'main-color',
		'post-meta-mb',
		'topbar-height', 'topbar-dark-bg',
		'head-inner-height',
		'main-ratio'
	];

	// Create copies of some extra :root vars in the IE vars.
	var copyRootVars = [
		'main-color',
		'nav-items-space', 'nav-text', 'nav-text-ls', 'nav-text-weight', 
		'nav-drop-text', 'nav-drop-ls',	'nav-color', 'nav-active-color', 
		'nav-blip-color', 'nav-drop-blip-color', 'nav-drop-bg', 'nav-drop-color', 
		'nav-drop-active-color', 'nav-drop-sep-color',
	];

	var alwaysExtraCss = '.main-head .sticky-bar { display: none; }';

	copyRootVars = copyRootVars.concat(autoVars);

	var allTheVars = [];

	cssVars({
		preserveVars: true,
		onlyLegacy: true,
		onSuccess: function(cssText) {
			cssText = cssText.replace('._ie-mq', ':root');

			// var vars = Object.keys(replaceVars).map(function(e) {
			// 	return replaceVars[e][0];
			// });

			// For Devs: Get all the CSS vars.
			// var found = cssText.match(/(?<=var\(--)([A-Za-z0-9-_]+)(?=[^;!}{])/g);
			// if (found) {
			// 	allTheVars = [...allTheVars, ...found];
			// }

			// cssText = cssText.replace(new RegExp('--(' + vars.join('|') + ')', 'g'), '-$1');
			cssText = cssText.replace(new RegExp('--(' + autoVars.join('|') + ')', 'g'), '-$1');

			cssText = cssText.replace(
				new RegExp('(?:[\\s{;])(--('+ copyRootVars.join('|') +')\\s*:[^;!}{]+(!important)?)(\\s*([;}]|$))', 'g'), 
				function(varDef, $1, theVar) {
					varDef = varDef.trim();
					return varDef + varDef.substring(1);
				}
			);

			return cssText;
		},
		onComplete: function(cssText, eles) {

			// Ensure it's a supported IE version.
			if (!window.MSInputMethodContext || !document.documentMode) {
				return;
			}

			// For example, var(--main-color) should change to var(-main-color) now that :root
			// has been handled.
			cssText = cssText.replace(new RegExp('--(' + copyRootVars.join('|') + ')', 'g'), '-$1');

			// Match all rules with sels containing vars.
			var withVars = /(?:(?:[}{]\s*|^\s*|})((\.|#|:|[a-z])[^{}]+?){[^}]+?)(var\([^}]+)(?=}|$)/g;
			var theRules = {};
			var uniqCount = 1;
			
			cssText = cssText.replace(withVars, function(theText, sel) {
				// var regex = /(var\(-([A-Za-z0-9-_]+)[,\)][^;!}{]+)/g;
				var regex = /[{;]\s*([A-Za-z0-9-_]+\s*:\s*[^;}{]*var\([^!;}{]+)(!important)?(?=\s*([;}$]|$))/g;

				var r;
				do {
					if (r = regex.exec(theText)) {
						if (!theRules[sel]) { 
							theRules[sel] = [];
						}

						theRules[sel].push(r[1]);
					}
				} while(r);
			});

			if (!theRules) {
				return;
			}

			var extractVars = function(varText) {
				var matches = varText.match(/-([A-Za-z0-9-_]+)(?=[,\)])/g);
				return matches || [];
			}

			var getComputedVar = function(el, theVar) {

				var value = null

				while (el.nodeType === 1) {
					var style = getComputedStyle(el);
					var value = style[theVar];

					if (value !== undefined) {

						// Value is a var()? Find a matching one from there.
						if (value.indexOf('var(') !== -1) {

							var moreVars = extractVars(value);
							for (var k in moreVars) {
								var _value = getComputedVar(el, moreVars[k]);

								if (_value) {
									value = _value;
									break;
								}
							}
						}

						break;
					}

					el = el.parentNode;
				}

				return value;
			};

			var doComputeProps = function(ele, props) {

				props = props.map(function(prop) {

					var keep = false;
					// Prev: /(var\(-([A-Za-z0-9-_]+)[^;!}{]+)(?=;|$)/g
					// Matches var(--foo), var(--foo, var(--foo)) and var(--foo, 10px)
					prop = prop.replace(/(var\(-([A-Za-z0-9-_]+)(\s*\)|,[^;!}{\)]+\)\s*\)?))/g, function(varText) {
						var foundVars = extractVars(varText),
							theValue = '';
						
						// Use the first var of the fallbacks.
						for (var i in foundVars) {

							theValue = getComputedVar(ele, foundVars[i]);

							if (theValue) {
								break;
							}
						}

						// Found the required computed variable.
						if (theValue && theValue !== '') {
							keep = true;
							return theValue;
						}

						return varText;
					});

					return keep ? prop : null;
				});

				return props.filter(function(el) {
					return el !== null;
				});
			};

			/**
			 * Begin selective replacement as specified.
			 */

			cssText = cssText.replace(",\n", '');
			var extraCss = [];

			var extraCss = [];
			var addClasses = [];
			Object.keys(theRules).forEach(function(i) {

				var sel = i,
					props = theRules[i];

				var selectors = sel.split(',');
				var ruleCss = {};
				for (var k in selectors) {

					var selector = selectors[k].trim();

					if (validSelectors.indexOf(selector) === -1) {
						continue;
					}

					// Matched elements for the split selector.
					var eles = document.querySelectorAll(selector.replace(/(:after|:before)/g, ''));

					// console.log('Computing for ' + selector);
					// console.dir(props);

					ruleCss[selector] = [];

					for (var x in eles) {

						var ele  = eles[x],
							addClass = 'ie_uq-' + uniqCount;
						
						if (typeof ele !== 'object') {
							continue;
						}

						var createdProps = doComputeProps(ele, props).join(";");
						if (createdProps) {
							
							uniqCount++;
							
							addClasses.push([ele, addClass]);

							var theSelector = selector;
							if (/(:before|:after)/.test(selector)) {
								theSelector = theSelector.replace(/(:before|:after)/, '.' + addClass + '$1');
							}
							else {
								theSelector += '.' + addClass;
							}

							extraCss.push(
								theSelector + ' {'
								+ createdProps
								+ '}'
							);
						}
					}
				}
			});

			// console.log(extraCss);

			requestAnimationFrame(function() {
				addClasses.forEach(function(toAdd) {
					var ele = toAdd[0],
						cssClass = toAdd[1];
					ele.classList.add(cssClass);	
				});

				var css = extraCss.join(' ') + alwaysExtraCss,
					head = document.head || document.getElementsByTagName('head')[0],
					style = document.createElement('style');

				head.appendChild(style);
				style.type = 'text/css';
				style.appendChild(document.createTextNode(css));
			});

		}
	});
};

/*!
 * css-vars-ponyfill
 * v2.1.2
 * https://jhildenbiddle.github.io/css-vars-ponyfill/
 * (c) 2018-2019 John Hildenbiddle <http://hildenbiddle.com>
 * MIT license
 */
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