var IFRAME_NS = 'iframe',
	_emptyPage = '//about:blank',
	
	_fixIframeBugs = function(isShowing) {
		if(mfp.currTemplate[IFRAME_NS]) {
			var el = mfp.currTemplate[IFRAME_NS].find('iframe');
			if(el.length) { 
				// reset src after the popup is closed to avoid "video keeps playing after popup is closed" bug
				if(!isShowing) {
					el[0].src = _emptyPage;
				}

				// IE8 black screen bug fix
				if(mfp.isIE8) {
					el.css('display', isShowing ? 'block' : 'none');
				}
			}
		}
	};

$.magnificPopup.registerModule(IFRAME_NS, {

	options: {
		markup: '<div class="mfp-iframe-scaler">'+
					'<div class="mfp-close"></div>'+
					'<iframe class="mfp-iframe" src="//about:blank" frameborder="0" allowfullscreen></iframe>'+
				'</div>',

		srcAction: 'iframe_src',

		// we don't care and support only one default type of URL by default
		patterns: {
			youtube: {
				index: 'youtube.com', 
				id: 'v=', 
				src: '//www.youtube.com/embed/%id%?autoplay=1'
			},
			vimeo: {
				index: 'vimeo.com/',
				id: '/',
				src: '//player.vimeo.com/video/%id%?autoplay=1'
			},
			gmaps: {
				index: '//maps.google.',
				src: '%id%&output=embed'
			}
		}
	},

	proto: {
		initIframe: function() {
			mfp.types.push(IFRAME_NS);

			_mfpOn('BeforeChange', function(e, prevType, newType) {
				if(prevType !== newType) {
					if(prevType === IFRAME_NS) {
						_fixIframeBugs(); // iframe if removed
					} else if(newType === IFRAME_NS) {
						_fixIframeBugs(true); // iframe is showing
					} 
				}// else {
					// iframe source is switched, don't do anything
				//}
			});

			_mfpOn(CLOSE_EVENT + '.' + IFRAME_NS, function() {
				_fixIframeBugs();
			});
		},

		getIframe: function(item, template) {
			var embedSrc = item.src;
			var iframeSt = mfp.st.iframe;
				
			$.each(iframeSt.patterns, function() {
				if(embedSrc.indexOf( this.index ) > -1) {
					if(this.id) {
						if(typeof this.id === 'string') {
							embedSrc = embedSrc.substr(embedSrc.lastIndexOf(this.id)+this.id.length, embedSrc.length);
						} else {
							embedSrc = this.id.call( this, embedSrc );
						}
					}
					embedSrc = this.src.replace('%id%', embedSrc );
					return false; // break;
				}
			});
			
			var dataObj = {};
			if(iframeSt.srcAction) {
				dataObj[iframeSt.srcAction] = embedSrc;
			}
			mfp._parseMarkup(template, dataObj, item);

			mfp.updateStatus('ready');

			return template;
		}
	}
});