var ajaxify = {};


(function($) {

	var location = document.location || window.location,
		rootUrl = location.protocol + '//' + (location.hostname || location.host) + (location.port ? ':' + location.port : ''),
		content = null;

	var current_state = null;
	var executed = {};

	var events = [];
	ajaxify.register_events = function(new_page_events) {
		for (var i = 0, ii = events.length; i<ii; i++) {
			socket.removeAllListeners(events[i]); // optimize this to user removeListener(event, listener) instead.
		}

		events = new_page_events;
	};


	window.onpopstate = function(event) {
		// "quiet": If set to true, will not call pushState
		if (event !== null && event.state && event.state.url !== undefined) ajaxify.go(event.state.url, null, null, true);
	};

	ajaxify.go = function(url, callback, template, quiet) {
		$(window).off('scroll');
		// leave room and join global
		app.enter_room('global');

		var url = url.replace(/\/$/, "");

		var hash = window.location.hash;

		if(url.indexOf(RELATIVE_PATH.slice(1)) !== -1) {
			url = url.slice(RELATIVE_PATH.length);
		}

		var tpl_url = templates.get_custom_map(url.split('?')[0]);

		if (tpl_url == false && !templates[url]) {
			if(url === '' || url === '/') {
				tpl_url = 'home';
			} else {
				tpl_url = url.split('/')[0].split('?')[0];
			}

		} else if (templates[url]) {
			tpl_url = url;
		}

		if (templates.is_available(tpl_url) && !templates.force_refresh(tpl_url)) {
			if (quiet !== true) {
				window.history.pushState({
					"url": url
				}, url, RELATIVE_PATH + "/" + url);
			}

			jQuery('#footer, #content').fadeOut(100);

			templates.flush();
			templates.load_template(function() {
				exec_body_scripts(content);

				if (callback) {
					callback();
				}

				app.process_page();

				jQuery('#content, #footer').stop(true, true).fadeIn(200, function() {
					if(window.location.hash)
						hash = window.location.hash;
					if(hash)
						app.scrollToPost(hash.substr(1));
				});

				utils.refreshTitle(url);

			}, url, template);

			return true;
		}

		return false;
	}

	$('document').ready(function() {
		if (!window.history || !window.history.pushState) return; // no ajaxification for old browsers

		content = content || document.getElementById('content');

		// Enhancing all anchors to ajaxify...
		$(document.body).on('click', 'a', function(e) {

			function hrefEmpty(href) {
				return href == 'javascript:;' || href == window.location.href + "#" || href.slice(-1) === "#";
			}

			if(hrefEmpty(this.href)) return;

			var url = this.href.replace(rootUrl +'/', '');

			if (this.target !== '') return;

			if (!e.ctrlKey && e.which === 1) {
				if (ajaxify.go(url)) {
					e.preventDefault();
				}
			}
		});
	});


	function exec_body_scripts(body_el) {
		// modified from http://stackoverflow.com/questions/2592092/executing-script-elements-inserted-with-innerhtml

		function nodeName(elem, name) {
			return elem.nodeName && elem.nodeName.toUpperCase() === name.toUpperCase();
		};

		function evalScript(elem) {
			var data = (elem.text || elem.textContent || elem.innerHTML || "" ),
				head =	document.getElementsByTagName("head")[0] ||
						document.documentElement,
				script = document.createElement("script");

			script.type = "text/javascript";
			try {
			  script.appendChild(document.createTextNode(data));
			} catch(e) {
			  script.text = data;
			}

			if (elem.src) {
				script.src = elem.src;
			}

			head.insertBefore(script, head.firstChild);
			//TODO: remove from head before inserting?, doing this breaks scripts in safari so commented out for now
			//head.removeChild(script);
		};

		var scripts = [],
			script,
			children_nodes = body_el.childNodes,
			child,
			i;

		for (i = 0; children_nodes[i]; i++) {
			child = children_nodes[i];
			if (nodeName(child, "script" ) &&
			(!child.type || child.type.toLowerCase() === "text/javascript")) {
				scripts.push(child);
			}
		}

		for (i = 0; scripts[i]; i++) {
			script = scripts[i];
			if (script.parentNode) {
				script.parentNode.removeChild(script);
			}
			evalScript(scripts[i]);
		}
	};

}(jQuery));