/*!
 * Nestable jQuery Plugin - Copyright (c) 2012 David Bushell - http://dbushell.com/
 * Dual-licensed under the BSD or MIT licenses
 */
;(function($, window, document, undefined) {
	var hasTouch = 'ontouchstart' in window;
	/**
	 * Detect CSS pointer-events property
	 * events are normally disabled on the dragging element to avoid conflicts
	 * https://github.com/ausi/Feature-detection-technique-for-pointer-events/blob/master/modernizr-pointerevents.js
	 */
	var hasPointerEvents = (function() {
		var el = document.createElement('div'), docEl = document.documentElement;
		if(!('pointerEvents' in el.style)) {
			return false;
		}
		el.style.pointerEvents = 'auto';
		el.style.pointerEvents = 'x';
		docEl.appendChild(el);
		var supports = window.getComputedStyle && window.getComputedStyle(el, '').pointerEvents === 'auto';
		docEl.removeChild(el);
		return !!supports;
	})();
	var eStart = hasTouch ? 'touchstart' : 'mousedown', eMove = hasTouch ? 'touchmove' : 'mousemove', eEnd = hasTouch ? 'touchend' : 'mouseup', eCancel = hasTouch ? 'touchcancel' : 'mouseup';
	var defaults = {
		listNodeName: 'ol',
		itemNodeName: 'li',
		rootClass: 'dd',
		listClass: 'dd-list',
		itemClass: 'dd-item',
		dragClass: 'dd-dragel',
		handleClass: 'dd-handle',
		collapsedClass: 'dd-collapsed',
		placeClass: 'dd-placeholder',
		noDragClass: 'dd-nodrag',
		emptyClass: 'dd-empty',
		expandBtnHTML: '<button data-action ="expand" type="button">Expand</button>',
		collapseBtnHTML: '<button data-action ="collapse" type="button">Collapse</button>',
		group: 0,
		maxDepth: 5,
		threshold: 20,
		scroll: false,
		scrollSensitivity: 1,
		scrollSpeed: 5,
		scrollTriggers: {
			top: 40,
			left: 40,
			right: -40,
			bottom: -40
		}
	};
	function Plugin(element, options) {
		this.w = $(window);
		this.el = $(element);
		this.rtl = this.el.css('direction') == "rtl";
		// console.log('this.rtl',this.rtl);
		this.options = $.extend({}, defaults, options);
		this.init();
	}


	Plugin.prototype = {
		init: function() {
			var list = this;
			list.reset();
			list.el.data('nestable-group', this.options.group);
			list.placeEl = $('<div class="' + list.options.placeClass + '"/>');
			$.each(this.el.find(list.options.itemNodeName), function(k, el) {
				list.setParent($(el));
			});
			list.el.on('click', 'button', function(e) {
				if(list.dragEl || (!hasTouch && e.button !== 0)) {
					return;
				}
				var target = $(e.currentTarget), action = target.data('action'), item = target.parent(list.options.itemNodeName);
				if(action === 'collapse') {
					list.collapseItem(item);
				}
				if(action === 'expand') {
					list.expandItem(item);
				}
			});
			var onStartEvent = function(e) {
				var handle = $(e.target);
				if(!handle.hasClass(list.options.handleClass)) {
					if(handle.closest('.' + list.options.noDragClass).length) {
						return;
					}
					handle = handle.closest('.' + list.options.handleClass);
				}
				if(!handle.length || list.dragEl || (!hasTouch && e.button !== 0) || (hasTouch && e.touches.length !== 1)) {
					return;
				}
				e.preventDefault();
				list.dragStart( hasTouch ? e.touches[0] : e);
			};
			var onMoveEvent = function(e) {
				if(list.dragEl) {
					e.preventDefault();
					list.dragMove( hasTouch ? e.touches[0] : e);
				}
			};
			var onEndEvent = function(e) {
				if(list.dragEl) {
					e.preventDefault();
					list.dragStop( hasTouch ? e.touches[0] : e);
				}
			};
			if(hasTouch) {
				list.el[0].addEventListener(eStart, onStartEvent, false);
				window.addEventListener(eMove, onMoveEvent, false);
				window.addEventListener(eEnd, onEndEvent, false);
				window.addEventListener(eCancel, onEndEvent, false);
			} else {
				list.el.on(eStart, onStartEvent);
				list.w.on(eMove, onMoveEvent);
				list.w.on(eEnd, onEndEvent);
			}
		},
		serialize: function() {
			var data, depth = 0, list = this;
			step = function(level, depth) {
				var array = [], items = level.children(list.options.itemNodeName);
				items.each(function() {
					var li = $(this), item = $.extend({}, li.data()), sub = li.children(list.options.listNodeName);
					if(sub.length) {
						item.children = step(sub, depth + 1);
					}
					array.push(item);
				});
				return array;
			};
			data = step(list.el.find(list.options.listNodeName).first(), depth);
			return data;
		},
		serialise: function() {
			return this.serialize();
		},
		reset: function() {
			this.mouse = {
				offsetX: 0,
				offsetY: 0,
				startX: 0,
				startY: 0,
				lastX: 0,
				lastY: 0,
				nowX: 0,
				nowY: 0,
				distX: 0,
				distY: 0,
				dirAx: 0,
				dirX: 0,
				dirY: 0,
				lastDirX: 0,
				lastDirY: 0,
				distAxX: 0,
				distAxY: 0
			};
			this.moving = false;
			this.dragEl = null;
			this.dragRootEl = null;
			this.dragDepth = 0;
			this.hasNewRoot = false;
			this.pointEl = null;
		},
		expandItem: function(li) {
			li.removeClass(this.options.collapsedClass);
			li.children('[data-action="expand"]').hide();
			li.children('[data-action="collapse"]').show();
			li.children(this.options.listNodeName).show();
			this.el.trigger('expand', [li]);
			li.trigger('expand');
		},
		collapseItem: function(li) {
			var lists = li.children(this.options.listNodeName);
			if(lists.length) {
				li.addClass(this.options.collapsedClass);
				li.children('[data-action="collapse"]').hide();
				li.children('[data-action="expand"]').show();
				li.children(this.options.listNodeName).hide();
			}
			this.el.trigger('collapse', [li]);
			li.trigger('collapse');
		},
		expandAll: function() {
			var list = this;
			list.el.find(list.options.itemNodeName).each(function() {
				list.expandItem($(this));
			});
		},
		collapseAll: function() {
			var list = this;
			list.el.find(list.options.itemNodeName).each(function() {
				list.collapseItem($(this));
			});
		},
		setParent: function(li) {
			if(li.children(this.options.listNodeName).length) {
				li.prepend($(this.options.expandBtnHTML));
				li.prepend($(this.options.collapseBtnHTML));
			}
			li.children('[data-action="expand"]').hide();
		},
		unsetParent: function(li) {
			li.removeClass(this.options.collapsedClass);
			li.children('[data-action]').remove();
			li.children(this.options.listNodeName).remove();
		},
		dragStart: function(e) {
			var mouse = this.mouse, target = $(e.target),
			// dragItem = target.closest(this.options.itemNodeName);
			dragItem = target.closest('.' + this.options.handleClass).closest(this.options.itemNodeName);
			this.target_width = target.width();
			// for rtl
			this.placeEl.css('height', dragItem.height());
			mouse.offsetX = e.offsetX !== undefined ? e.offsetX : e.pageX - target.offset().left;
			mouse.offsetY = e.offsetY !== undefined ? e.offsetY : e.pageY - target.offset().top;
			mouse.startX = mouse.lastX = e.pageX;
			mouse.startY = mouse.lastY = e.pageY;
			this.dragRootEl = this.el;
			this.dragEl = $(document.createElement(this.options.listNodeName)).addClass(this.options.listClass + ' ' + this.options.dragClass);
			this.dragEl.css('width', dragItem.width());
			// fix for zepto.js
			//dragItem.after(this.placeEl).detach().appendTo(this.dragEl);
			dragItem.after(this.placeEl);
			dragItem[0].parentNode.removeChild(dragItem[0]);
			dragItem.appendTo(this.dragEl);
			var rtlFix = 0;
			if(this.rtl)
				rtlFix = this.dragEl.width() - this.target_width;
			// console.log( 'rtl:', this.rtl );
			// console.log( 'e.pageX: ', e.pageX, 'e.pageY: ', e.pageY, 'mouse.offsetX: ', mouse.offsetX, 'mouse.offsetY: ', mouse.offsetY );
			// console.log( 'left:', e.pageX - mouse.offsetX + rtlFix, 'top:', e.pageY - mouse.offsetY , 'rtlFix:', + rtlFix, 'this.dragEl.W:', this.dragEl.width(), 'target.w', target_width );
			// console.log('target:', target);
			// console.log('target.w',target_width );
			$(document.body).append(this.dragEl);
			this.dragEl.css({
				'left': e.pageX - mouse.offsetX - rtlFix,
				'top': e.pageY - mouse.offsetY
			});
			// total depth of dragging item
			var i, depth, items = this.dragEl.find(this.options.itemNodeName);
			for( i = 0; i < items.length; i++) {
				depth = $(items[i]).parents(this.options.listNodeName).length;
				if(depth > this.dragDepth) {
					this.dragDepth = depth;
				}
			}
		},
		dragStop: function(e) {
			// fix for zepto.js
			//this.placeEl.replaceWith(this.dragEl.children(this.options.itemNodeName + ':first').detach());
			var el = this.dragEl.children(this.options.itemNodeName).first();
			el[0].parentNode.removeChild(el[0]);
			this.placeEl.replaceWith(el);
			this.dragEl.remove();
			this.el.trigger('change');
			if(this.hasNewRoot) {
				this.dragRootEl.trigger('change');
			}
			this.reset();
		},
		dragMove: function(e) {
			var list, parent, prev, next, depth, opt = this.options, mouse = this.mouse;
			var rtlFix = 0;
			if(this.rtl)
				rtlFix = this.dragEl.width() - this.target_width;
			this.dragEl.css({
				'left': e.pageX - mouse.offsetX - rtlFix,
				'top': e.pageY - mouse.offsetY
			});
			// mouse position last events
			mouse.lastX = mouse.nowX;
			mouse.lastY = mouse.nowY;
			// mouse position this events
			mouse.nowX = e.pageX;
			mouse.nowY = e.pageY;
			// distance mouse moved between events
			mouse.distX = mouse.nowX - mouse.lastX;
			mouse.distY = mouse.nowY - mouse.lastY;
			// direction mouse was moving
			mouse.lastDirX = mouse.dirX;
			mouse.lastDirY = mouse.dirY;
			// direction mouse is now moving (on both axis)
			mouse.dirX = mouse.distX === 0 ? 0 : mouse.distX > 0 ? 1 : -1;
			mouse.dirY = mouse.distY === 0 ? 0 : mouse.distY > 0 ? 1 : -1;
			// axis mouse is now moving on
			var newAx = Math.abs(mouse.distX) > Math.abs(mouse.distY) ? 1 : 0;
			// do nothing on first move
			if(!mouse.moving) {
				mouse.dirAx = newAx;
				mouse.moving = true;
				return;
			}
			//Do scrolling
			if(opt.scroll) {
				var scrolled = false;
				var scrollParent = this.el.scrollParent()[0];
				if(scrollParent != document && scrollParent.tagName != 'HTML') {
					if((opt.scrollTriggers.bottom + scrollParent.offsetHeight) - e.pageY < opt.scrollSensitivity)
						scrollParent.scrollTop = scrolled = scrollParent.scrollTop + opt.scrollSpeed;
					else if(e.pageY - opt.scrollTriggers.top < opt.scrollSensitivity)
						scrollParent.scrollTop = scrolled = scrollParent.scrollTop - opt.scrollSpeed;
					if((opt.scrollTriggers.right + scrollParent.offsetWidth) - e.pageX < opt.scrollSensitivity)
						scrollParent.scrollLeft = scrolled = scrollParent.scrollLeft + opt.scrollSpeed;
					else if(e.pageX - opt.scrollTriggers.left < opt.scrollSensitivity)
						scrollParent.scrollLeft = scrolled = scrollParent.scrollLeft - opt.scrollSpeed;
				} else {
					if(e.pageY - $(document).scrollTop() < opt.scrollSensitivity)
						scrolled = $(document).scrollTop($(document).scrollTop() - opt.scrollSpeed);
					else if($(window).height() - (e.pageY - $(document).scrollTop()) < opt.scrollSensitivity)
						scrolled = $(document).scrollTop($(document).scrollTop() + opt.scrollSpeed);
					if(e.pageX - $(document).scrollLeft() < opt.scrollSensitivity)
						scrolled = $(document).scrollLeft($(document).scrollLeft() - opt.scrollSpeed);
					else if($(window).width() - (e.pageX - $(document).scrollLeft()) < opt.scrollSensitivity)
						scrolled = $(document).scrollLeft($(document).scrollLeft() + opt.scrollSpeed);
				}
			}
			if(this.scrollTimer)
				clearTimeout(this.scrollTimer);
			if(opt.scroll && scrolled) {
				this.scrollTimer = setTimeout(function() {
					$(window).trigger(e);
				}, 10);
			}
			// calc distance moved on this axis (and direction)
			if(mouse.dirAx !== newAx) {
				mouse.distAxX = 0;
				mouse.distAxY = 0;
			} else {
				mouse.distAxX += Math.abs(mouse.distX);
				if(mouse.dirX !== 0 && mouse.dirX !== mouse.lastDirX) {
					mouse.distAxX = 0;
				}
				mouse.distAxY += Math.abs(mouse.distY);
				if(mouse.dirY !== 0 && mouse.dirY !== mouse.lastDirY) {
					mouse.distAxY = 0;
				}
			}
			mouse.dirAx = newAx;
			/**
			 * move horizontal
			 */
			if(mouse.dirAx && mouse.distAxX >= opt.threshold) {
				// reset move distance on x-axis for new phase
				mouse.distAxX = 0;
				prev = this.placeEl.prev(opt.itemNodeName);
				// increase horizontal level if previous sibling exists and is not collapsed
				//! rtl?
				var distX_direction = true;
				// console.log('this.rtl',this.rtl);
				if(this.rtl && mouse.distX > 0) {
					distX_direction = false;
				}
				if(!this.rtl && mouse.distX < 0) {
					distX_direction = false;
				}
				if(distX_direction && prev.length && !prev.hasClass(opt.collapsedClass)) {
					// console.log('moving right');
					// cannot increase level when item above is collapsed
					list = prev.find(opt.listNodeName).last();
					// check if depth limit has reached
					depth = this.placeEl.parents(opt.listNodeName).length;
					if(depth + this.dragDepth <= opt.maxDepth) {
						// create new sub-level if one doesn't exist
						if(!list.length) {
							list = $('<' + opt.listNodeName + '/>').addClass(opt.listClass);
							list.append(this.placeEl);
							prev.append(list);
							this.setParent(prev);
						} else {
							// else append to next level up
							list = prev.children(opt.listNodeName).last();
							list.append(this.placeEl);
						}
					}
				}
				// decrease horizontal level
				if(!distX_direction) {
					// console.log('moving left');
					// we can't decrease a level if an item preceeds the current one
					next = this.placeEl.next(opt.itemNodeName);
					if(!next.length) {
						parent = this.placeEl.parent();
						this.placeEl.closest(opt.itemNodeName).after(this.placeEl);
						if(!parent.children().length) {
							this.unsetParent(parent.parent());
						}
					}
				}
			}
			var isEmpty = false;
			// find list item under cursor
			if(!hasPointerEvents) {
				this.dragEl[0].style.visibility = 'hidden';
			}
			this.pointEl = $(document.elementFromPoint(e.pageX - document.documentElement.scrollLeft, e.pageY - (window.pageYOffset || document.documentElement.scrollTop)));
			if(!hasPointerEvents) {
				this.dragEl[0].style.visibility = 'visible';
			}
			if(this.pointEl.hasClass(opt.handleClass)) {
				// this.pointEl = this.pointEl.parent(opt.itemNodeName);
				this.pointEl = this.pointEl.closest(opt.itemNodeName);
			}
			if(this.pointEl.hasClass(opt.emptyClass)) {
				isEmpty = true;
			} else if(!this.pointEl.length || !this.pointEl.hasClass(opt.itemClass)) {
				return;
			}
			// find parent list of item under cursor
			var pointElRoot = this.pointEl.closest('.' + opt.rootClass), isNewRoot = this.dragRootEl.data('nestable-id') !== pointElRoot.data('nestable-id');
			/**
			 * move vertical
			 */
			if(!mouse.dirAx || isNewRoot || isEmpty) {
				// check if groups match if dragging over new root
				if(isNewRoot && opt.group !== pointElRoot.data('nestable-group')) {
					return;
				}
				// check depth limit
				depth = this.dragDepth - 1 + this.pointEl.parents(opt.listNodeName).length;
				if(depth > opt.maxDepth) {
					return;
				}
				var before = e.pageY < (this.pointEl.offset().top + this.pointEl.height() / 2);
				parent = this.placeEl.parent();
				// if empty create new list to replace empty placeholder
				if(isEmpty) {
					list = $(document.createElement(opt.listNodeName)).addClass(opt.listClass);
					list.append(this.placeEl);
					this.pointEl.replaceWith(list);
				} else if(before) {
					this.pointEl.before(this.placeEl);
				} else {
					this.pointEl.after(this.placeEl);
				}
				if(!parent.children().length) {
					this.unsetParent(parent.parent());
				}
				if(!this.dragRootEl.find(opt.itemNodeName).length) {
					//console.log('nest add empty placeholder');
					this.dragRootEl.append('<div class="' + opt.emptyClass + '"/>');
				}
				// parent root list has changed
				this.dragRootEl = pointElRoot;
				if(isNewRoot) {
					//this.dragRootEl = pointElRoot;
					this.hasNewRoot = this.el[0] !== this.dragRootEl[0];
				}
			}
		}
	};
	$.fn.nestable = function(params) {
		var lists = this, retval = this;
		lists.each(function(iel) {
			var plugin = $(this).data("nestable");
			if(!plugin) {
				$(this).data("nestable", new Plugin(this, params));
				// $(this).data("nestable-id", new Date().getTime());
				$(this).data("nestable-id", iel);
			} else {
				if( typeof params === 'string' && typeof plugin[params] === 'function') {
					retval = plugin[params]();
				}
			}
		});
		return retval || lists;
	};
})(window.jQuery || window.Zepto, window, document); 