(function($, core, undefined) {

var curs, curo,
	reQuery = /^\?(\w+)=([^#]+)(#.*)?$/;

core.widget('navigator', {
	options: {
		hashchangeListener: true,
		home: undefined
	},
	_create: function() {
		var self = this,
			options = self.options;
		self.location = options.location || location;
		self._handlers = [];
		options._skipHashchange = 0;
		$(window).hashchange(function(e) {
			if (options.hashchangeListener) {
				if (options._skipHashchange) {
					options._skipHashchange = 0;
				}
				else {
					self._change(self._read(), e);
				}
			}
		});
	},
	_read: function() {
		var s = location.hash;
		return s && (s.charAt(0) === '#' ? s.substring(1) : s)
			.replace(/%23/g, '#'); // fix: Safari encodes '#' in hash string as "%23".
	},
	_write: function(s) {
		location.hash = s;
	},
	_parse: function(s) {
		if (s === curs) {
			return curo;
		}
		var r = { original: s },
			m;
		curs = s;
		m = /^!(.+)(#.*)?$/.exec(s);
		if (m) {
			r.is = 'url';
			r.isUrl = true;
			r.url = m[1];
			r.hash = m[2];
			return curo = r;
		}
		m = reQuery.exec(s);
		if (m) {
			r.is = 'query';
			r.isQuery = true;
			r.key = m[1];
			r.value = decodeURIComponent(m[2]);
			r.hash = m[3];
			return curo = r;
		}
		r.is = 'hash'
		r.hash = s;
		return curo = r;
	},
	_str: function(r) {
		if (typeof r === 'string') {
			return '#!?'.indexOf(r.charAt(0)) > -1 ? r :
				reQuery.test(r) ? '?' + r :
				('!' + r);
		}
		return r.original ? r.original : 
			((r.isUrl ? ('!' + r.url) : 
			r.isQuery ? ('?' + r.key + '=' + encodeURIComponent(r.value)) :
			'') + (r.hash || ''));
	},
	_change: function(news, event, spec) {
		var self = this;
		if (!news || typeof news !== 'object') {
			news = self._parse(news || self._read());
		}
		if (spec || self._cur !== news.original) {
			news.previos = self._cur;
			self._cur = news.original;
			if (event !== false) {
				if (news.original === '') {
					self.home(event);
				}
				else {
					self.trigger('change', event, news);
				}
			}
		}
		return news;
	},
	init: function(event) {
		var self = this,
			val = self._parse(self._read());
		if (val.is !== 'hash') {
			self._change(val, event);
			return val;
		}
		else {
			self.home(event);
		}
	},
	val: function(val, event) {
		var self = this,
			s;
		if (val == undefined) {
			// getter
			return self._parse(self._read());
		}
		// setter
		self.options._skipHashchange = 1;
		self._write(self._str(val));
		self._change(val, event, true);
	},
	home: function(event) {
		var self = this,
			homeUrl = self.options.home;
		if (homeUrl) {
			if (self._read()) {
				self.options._skipHashchange = 1;
				self._write('');
			}
			self._change({ url: homeUrl, isUrl: true }, event, true);
		}
		else if (homeUrl === false) {
			self.blank(event);
		}
	},
	blank: function(event) {
		var self = this;
		if (self._read()) {
			self.options._skipHashchange = 1;
			self._write('');
		}
		self.trigger('blank', event, {});
	},
	back: function(to) {
		this.go(-Math.abs(to || 1));
	},
	forward: function(to) {
		this.go(Math.abs(to || 1));
	},
	go: function(to) {
		if (to === 0 || /home/i.test(to)) {
			return this.home();
		}
		if (/blank/i.test(to)) {
			return this.blank();
		}
		history.go(to);
	}
});

})(jQuery, nethelp);