/*!
 * jQuery UI Droppable @VERSION
 * http://jqueryui.com
 *
 * Copyright 2013 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/droppable/
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.widget.js
 *	jquery.ui.mouse.js
 *	jquery.ui.draggable.js
 */
(function( $, undefined ) {

function isOverAxis( x, reference, size ) {
	return ( x > reference ) && ( x < ( reference + size ) );
}

$.widget("ui.droppable", {
	version: "@VERSION",
	widgetEventPrefix: "drop",
	options: {
		accept: "*",
		activeClass: false,
		addClasses: true,
		greedy: false,
		hoverClass: false,
		scope: "default",
		tolerance: "intersect",

		// callbacks
		activate: null,
		deactivate: null,
		drop: null,
		out: null,
		over: null
	},
	_create: function() {

		var proportions,
			o = this.options,
			accept = o.accept;

		this.isover = false;
		this.isout = true;

		this.accept = $.isFunction(accept) ? accept : function(d) {
			return d.is(accept);
		};

		this.proportions = function( /* valueToWrite */ ) {
			if ( arguments.length ) {
				// Store the droppable's proportions
				proportions = arguments[ 0 ];
			} else {
				// Retrieve or derive the droppable's proportions
				return proportions ?
					proportions :
					proportions = {
						width: this.element[ 0 ].offsetWidth,
						height: this.element[ 0 ].offsetHeight
					};
			}
		};

		// Add the reference and positions to the manager
		$.ui.ddmanager.droppables[o.scope] = $.ui.ddmanager.droppables[o.scope] || [];
		$.ui.ddmanager.droppables[o.scope].push(this);

		(o.addClasses && this.element.addClass("ui-droppable"));

	},

	_destroy: function() {
		var i = 0,
			drop = $.ui.ddmanager.droppables[this.options.scope];

		for ( ; i < drop.length; i++ ) {
			if ( drop[i] === this ) {
				drop.splice(i, 1);
			}
		}

		this.element.removeClass("ui-droppable ui-droppable-disabled");
	},

	_setOption: function(key, value) {

		if(key === "accept") {
			this.accept = $.isFunction(value) ? value : function(d) {
				return d.is(value);
			};
		}
		$.Widget.prototype._setOption.apply(this, arguments);
	},

	_activate: function(event) {
		var draggable = $.ui.ddmanager.current;
		if(this.options.activeClass) {
			this.element.addClass(this.options.activeClass);
		}
		if(draggable){
			this._trigger("activate", event, this.ui(draggable));
		}
	},

	_deactivate: function(event) {
		var draggable = $.ui.ddmanager.current;
		if(this.options.activeClass) {
			this.element.removeClass(this.options.activeClass);
		}
		if(draggable){
			this._trigger("deactivate", event, this.ui(draggable));
		}
	},

	_over: function(event) {

		var draggable = $.ui.ddmanager.current;

		// Bail if draggable and droppable are same element
		if (!draggable || (draggable.currentItem || draggable.element)[0] === this.element[0]) {
			return;
		}

		if (this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
			if(this.options.hoverClass) {
				this.element.addClass(this.options.hoverClass);
			}
			this._trigger("over", event, this.ui(draggable));
		}

	},

	_out: function(event) {

		var draggable = $.ui.ddmanager.current;

		// Bail if draggable and droppable are same element
		if (!draggable || (draggable.currentItem || draggable.element)[0] === this.element[0]) {
			return;
		}

		if (this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
			if(this.options.hoverClass) {
				this.element.removeClass(this.options.hoverClass);
			}
			this._trigger("out", event, this.ui(draggable));
		}

	},

	_drop: function(event,custom) {

		var draggable = custom || $.ui.ddmanager.current,
			childrenIntersection = false;

		// Bail if draggable and droppable are same element
		if (!draggable || (draggable.currentItem || draggable.element)[0] === this.element[0]) {
			return false;
		}

		this.element.find(":data(ui-droppable)").not(".ui-draggable-dragging").each(function() {
			var inst = $.data(this, "ui-droppable");
			if(
				inst.options.greedy &&
				!inst.options.disabled &&
				inst.options.scope === draggable.options.scope &&
				inst.accept.call(inst.element[0], (draggable.currentItem || draggable.element)) &&
				$.ui.intersect(draggable, $.extend(inst, { offset: inst.element.offset() }), inst.options.tolerance)
			) { childrenIntersection = true; return false; }
		});
		if(childrenIntersection) {
			return false;
		}

		if(this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
			if(this.options.activeClass) {
				this.element.removeClass(this.options.activeClass);
			}
			if(this.options.hoverClass) {
				this.element.removeClass(this.options.hoverClass);
			}
			this._trigger("drop", event, this.ui(draggable));
			return this.element;
		}

		return false;

	},

	ui: function(c) {
		return {
			draggable: (c.currentItem || c.element),
			helper: c.helper,
			position: c.position,
			offset: c.positionAbs
		};
	}

});

$.ui.intersect = function(draggable, droppable, toleranceMode) {

	if (!droppable.offset) {
		return false;
	}

	var draggableLeft, draggableTop,
		x1 = (draggable.positionAbs || draggable.position.absolute).left,
		y1 = (draggable.positionAbs || draggable.position.absolute).top,
		x2 = x1 + draggable.helperProportions.width,
		y2 = y1 + draggable.helperProportions.height,
		l = droppable.offset.left,
		t = droppable.offset.top,
		r = l + droppable.proportions().width,
		b = t + droppable.proportions().height;

	switch (toleranceMode) {
		case "fit":
			return (l <= x1 && x2 <= r && t <= y1 && y2 <= b);
		case "intersect":
			return (l < x1 + (draggable.helperProportions.width / 2) && // Right Half
				x2 - (draggable.helperProportions.width / 2) < r && // Left Half
				t < y1 + (draggable.helperProportions.height / 2) && // Bottom Half
				y2 - (draggable.helperProportions.height / 2) < b ); // Top Half
		case "pointer":
			draggableLeft = ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left);
			draggableTop = ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top);
			return isOverAxis( draggableTop, t, droppable.proportions().height ) && isOverAxis( draggableLeft, l, droppable.proportions().width );
		case "touch":
			return (
				(y1 >= t && y1 <= b) ||	// Top edge touching
				(y2 >= t && y2 <= b) ||	// Bottom edge touching
				(y1 < t && y2 > b)		// Surrounded vertically
			) && (
				(x1 >= l && x1 <= r) ||	// Left edge touching
				(x2 >= l && x2 <= r) ||	// Right edge touching
				(x1 < l && x2 > r)		// Surrounded horizontally
			);
		default:
			return false;
		}

};

/*
	This manager tracks offsets of draggables and droppables
*/
$.ui.ddmanager = {
	current: null,
	droppables: { "default": [] },
	prepareOffsets: function(t, event) {

		var i, j,
			m = $.ui.ddmanager.droppables[t.options.scope] || [],
			type = event ? event.type : null, // workaround for #2317
			list = (t.currentItem || t.element).find(":data(ui-droppable)").addBack();

		droppablesLoop: for (i = 0; i < m.length; i++) {

			//No disabled and non-accepted
			if(m[i].options.disabled || (t && !m[i].accept.call(m[i].element[0],(t.currentItem || t.element)))) {
				continue;
			}

			// Filter out elements in the current dragged item
			for (j=0; j < list.length; j++) {
				if(list[j] === m[i].element[0]) {
					m[i].proportions().height = 0;
					continue droppablesLoop;
				}
			}

			m[i].visible = m[i].element.css("display") !== "none";
			if(!m[i].visible) {
				continue;
			}

			//Activate the droppable if used directly from draggables
			if(type === "mousedown") {
				m[i]._activate.call(m[i], event);
			}

			m[ i ].offset = m[ i ].element.offset();
			m[ i ].proportions({ width: m[ i ].element[ 0 ].offsetWidth, height: m[ i ].element[ 0 ].offsetHeight });

		}

	},
	drop: function(draggable, event) {

		var dropped = false;
		// Create a copy of the droppables in case the list changes during the drop (#9116)
		$.each(($.ui.ddmanager.droppables[draggable.options.scope] || []).slice(), function() {

			if(!this.options) {
				return;
			}
			if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance)) {
				dropped = this._drop.call(this, event) || dropped;
			}

			if (!this.options.disabled && this.visible && this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
				this.isout = true;
				this.isover = false;
				this._deactivate.call(this, event);
			}

		});
		return dropped;

	},
	dragStart: function( draggable, event ) {
		//Listen for scrolling so that if the dragging causes scrolling the position of the droppables can be recalculated (see #5003)
		draggable.element.parentsUntil( "body" ).bind( "scroll.droppable", function() {
			if( !draggable.options.refreshPositions ) {
				$.ui.ddmanager.prepareOffsets( draggable, event );
			}
		});
	},
	drag: function(draggable, event) {

		//If you have a highly dynamic page, you might try this option. It renders positions every time you move the mouse.
		if(draggable.options.refreshPositions) {
			$.ui.ddmanager.prepareOffsets(draggable, event);
		}

		//Run through all droppables and check their positions based on specific tolerance options
		$.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function() {

			if(this.options.disabled || this.greedyChild || !this.visible) {
				return;
			}

			var parentInstance, scope, parent,
				intersects = $.ui.intersect(draggable, this, this.options.tolerance),
				c = !intersects && this.isover ? "isout" : (intersects && !this.isover ? "isover" : null);
			if(!c) {
				return;
			}

			if (this.options.greedy) {
				// find droppable parents with same scope
				scope = this.options.scope;
				parent = this.element.parents(":data(ui-droppable)").filter(function () {
					return $.data(this, "ui-droppable").options.scope === scope;
				});

				if (parent.length) {
					parentInstance = $.data(parent[0], "ui-droppable");
					parentInstance.greedyChild = (c === "isover");
				}
			}

			// we just moved into a greedy child
			if (parentInstance && c === "isover") {
				parentInstance.isover = false;
				parentInstance.isout = true;
				parentInstance._out.call(parentInstance, event);
			}

			this[c] = true;
			this[c === "isout" ? "isover" : "isout"] = false;
			this[c === "isover" ? "_over" : "_out"].call(this, event);

			// we just moved out of a greedy child
			if (parentInstance && c === "isout") {
				parentInstance.isout = false;
				parentInstance.isover = true;
				parentInstance._over.call(parentInstance, event);
			}
		});

	},
	dragStop: function( draggable, event ) {
		draggable.element.parentsUntil( "body" ).unbind( "scroll.droppable" );
		//Call prepareOffsets one final time since IE does not fire return scroll events when overflow was caused by drag (see #5003)
		if( !draggable.options.refreshPositions ) {
			$.ui.ddmanager.prepareOffsets( draggable, event );
		}
	}
};

})(jQuery);