define(function(){
	return {
		routes: [],
		mode: null,
		root: '/',
		config: function(options) {
			this.mode = options && options.mode && options.mode == 'history' && !!(history.pushState) ? 'history' : 'hash';
			this.root = options && options.root ? '/' + this.clearSlashes(options.root) + '/' : '/';
			return this;
		},
		getFragment: function() {
			var fragment = '';
			if(this.mode === 'history') {
				fragment = this.clearSlashes(decodeURI(location.pathname + location.search));
				fragment = fragment.replace(/\?(.*)$/, '');
				fragment = this.root != '/' ? fragment.replace(this.root, '') : fragment;
			} else {
				var match = window.location.href.match(/#(.*)$/);
				fragment = match ? match[1] : '';
			}
			return this.clearSlashes(fragment);
		},
		clearSlashes: function(path) {
			return path.toString().replace(/\/$/, '').replace(/^\//, '');
		},
		add: function(re, handler) {
			if(typeof re == 'function') {
				handler = re;
				re = '';
			}
			this.routes.push({ re: re, handler: handler});
			return this;
		},
		remove: function(param) {
			var r;
			for(var i=0; i<this.routes.length; i++) {
				r = this.routes[i];
				if(r.handler === param || r.re.toString() === param.toString()) {
					this.routes.splice(i, 1);
					return this;
				}
			}
			return this;
		},
		flush: function() {
			this.routes = [];
			this.mode = null;
			this.root = '/';
			return this;
		},
		check: function(f) {
			var fragment = f || this.getFragment();
			for(var i=0; i<this.routes.length; i++) {
				var match = fragment.match(this.routes[i].re);
				if(match) {
					match.shift();
					this.routes[i].handler.apply({}, match);
					return this;
				}
			}
			return this;
		},
		listen: function() {
			var self = this;
			var current = self.getFragment();
			var fn = function() {
				if(current !== self.getFragment()) {
					current = self.getFragment();
					self.check(current);
				}
			};
			clearInterval(this.interval);
			this.interval = setInterval(fn, 50);
			return this;
		},
		navigate: function(path) {
			path = path ? path : '';
			if(this.mode === 'history') {
				history.pushState(null, null, this.root + this.clearSlashes(path));
			} else {
				window.location.href = window.location.href.replace(/#(.*)$/, '') + '#' + path;
			}
			return this;
		}
	};
});