Rickshaw.namespace('Rickshaw.Graph.Behavior.Series.Toggle');

Rickshaw.Graph.Behavior.Series.Toggle = function(args) {

	this.graph = args.graph;
	this.legend = args.legend;

	var self = this;

	this.addAnchor = function(line) {

		var anchor = document.createElement('a');
		anchor.innerHTML = '&#10004;';
		anchor.classList.add('action');
		line.element.insertBefore(anchor, line.element.firstChild);

		anchor.onclick = function(e) {
			if (line.series.disabled) {
				line.series.enable();
				line.element.classList.remove('disabled');
			} else { 
				if (this.graph.series.filter(function(s) { return !s.disabled }).length <= 1) return;
				line.series.disable();
				line.element.classList.add('disabled');
			}

			self.graph.update();

		}.bind(this);
		
                var label = line.element.getElementsByTagName('span')[0];
                label.onclick = function(e){

                        var disableAllOtherLines = line.series.disabled;
                        if ( ! disableAllOtherLines ) {
                                for ( var i = 0; i < self.legend.lines.length; i++ ) {
                                        var l = self.legend.lines[i];
                                        if ( line.series === l.series ) {
                                                // noop
                                        } else if ( l.series.disabled ) {
                                                // noop
                                        } else {
                                                disableAllOtherLines = true;
                                                break;
                                        }
                                }
                        }

                        // show all or none
                        if ( disableAllOtherLines ) {

                                // these must happen first or else we try ( and probably fail ) to make a no line graph
                                line.series.enable();
                                line.element.classList.remove('disabled');

                                self.legend.lines.forEach(function(l){
                                        if ( line.series === l.series ) {
                                                // noop
                                        } else {
                                                l.series.disable();
                                                l.element.classList.add('disabled');
                                        }
                                });

                        } else {

                                self.legend.lines.forEach(function(l){
                                        l.series.enable();
                                        l.element.classList.remove('disabled');
                                });

                        }

                        self.graph.update();

                };

	};

	if (this.legend) {

		var $ = jQuery;
		if (typeof $ != 'undefined' && $(this.legend.list).sortable) {

			$(this.legend.list).sortable( {
				start: function(event, ui) {
					ui.item.bind('no.onclick',
						function(event) {
							event.preventDefault();
						}
					);
				},
				stop: function(event, ui) {
					setTimeout(function(){
						ui.item.unbind('no.onclick');
					}, 250);
				}
			});
		}

		this.legend.lines.forEach( function(l) {
			self.addAnchor(l);
		} );
	}

	this._addBehavior = function() {

		this.graph.series.forEach( function(s) {
			
			s.disable = function() {

				if (self.graph.series.length <= 1) {
					throw('only one series left');
				}
				
				s.disabled = true;
			};

			s.enable = function() {
				s.disabled = false;
			};
		} );
	};
	this._addBehavior();

	this.updateBehaviour = function () { this._addBehavior() };

};
