/*! fg-ajax-include - v0.2.0 - 2016-07-18
* http://filamentgroup.com/lab/ajax_includes_modular_content/
* Copyright (c) 2016 @scottjehl, Filament Group, Inc.; Licensed MIT */

(function( $, win, undefined ){

	var AI = {
		boundAttr: "data-ajax-bound",
		interactionAttr: "data-interaction",
		// request a url and trigger ajaxInclude on elements upon response
		makeReq: function( url, els, isHijax ) {
			$.get( url, function( data, status, xhr ) {
				els.trigger( "ajaxIncludeResponse", [ data, xhr ] );
			});
		},
		plugins: {}
	};

	$.fn.ajaxInclude = function( options ) {
		var urllist = [],
			elQueue = $(),
			o = {
				proxy: null
			};

		// Option extensions
		// String check: deprecated. Formerly, proxy was the single arg.
		if( typeof options === "string" ){
			o.proxy = options;
		}
		else {
			o = $.extend( o, options );
		}

		// if it's a proxy, queue the element and its url, if not, request immediately
		function queueOrRequest( el ){
			var url = el.data( "url" );
			if( o.proxy && $.inArray( url, urllist ) === -1 ){
				urllist.push( url );
				elQueue = elQueue.add( el );
			}
			else{
				AI.makeReq( url, el );
			}
		}

		// if there's a url queue
		function runQueue(){
			if( urllist.length ){
				AI.makeReq( o.proxy + urllist.join( "," ), elQueue );
				elQueue = $();
				urllist = [];
			}
		}

		// bind a listener to a currently-inapplicable media query for potential later changes
		function bindForLater( el, media ){
			var mm = win.matchMedia( media );
			function cb(){
				queueOrRequest( el );
				runQueue();
				mm.removeListener( cb );
			}
			if( mm.addListener ){
				mm.addListener( cb );
			}
		}

		// loop through els, bind handlers
		this.not( "[" + AI.boundAttr + "]").not("[" + AI.interactionAttr + "]" ).each(function( k ) {
			var el = $( this ),
				media = el.attr( "data-media" ),
				methods = [ "append", "replace", "before", "after" ],
				method,
				url,
				isHijax = false,
				target = el.attr( "data-target" );

			for( var ml = methods.length, i=0; i < ml; i++ ){
				if( el.is( "[data-" + methods[ i ] + "]" ) ){
					method = methods[ i ];
					url = el.attr( "data-" + method );
				}
			}

			if( !url ) {
				// <a href> or <form action>
				url = el.attr( "href" ) || el.attr( "action" );
				isHijax = true;
			}

			if( method === "replace" ){
				method += "With";
			}

			el.data( "method", method )
				.data( "url", url )
				.data( "target", target )
				.attr( AI.boundAttr, true )
				.each( function() {
					for( var j in AI.plugins ) {
						AI.plugins[ j ].call( this, o );
					}
				})
				.bind( "ajaxIncludeResponse", function( e, data, xhr ){
					var content = data,
						targetEl = target ? $( target ) : el;

					if( o.proxy ){
						var subset = new RegExp("<entry url=[\"']?" + el.data("url") + "[\"']?>((?:(?!</entry>)(.|\n))*)", "gmi").exec(content);
						if( subset ){
							content = subset[1];
						}
					}

					var filteredContent = el.triggerHandler( "ajaxIncludeFilter", [ content ] );

					if( filteredContent ){
						content = filteredContent;
					}

					if( method === 'replaceWith' ) {
						el.trigger( "ajaxInclude", [ content ] );
						targetEl[ el.data( "method" ) ]( content );
					} else {
						targetEl[ el.data( "method" ) ]( content );
						el.trigger( "ajaxInclude", [ content ] );
					}
				});

			// When hijax, ignores matchMedia, proxies/queueing
			if ( isHijax ) {
				AI.makeReq( url, el, true );
			}
			else if ( !media || ( win.matchMedia && win.matchMedia( media ).matches ) ) {
				queueOrRequest( el );
			}
			else if( media && win.matchMedia ){
				bindForLater( el, media );
			}
		});

		// empty the queue for proxied requests
		runQueue();

		// return elems
		return this;
	};

	win.AjaxInclude = AI;
}( jQuery, this ));