/*!
 * jQuery UI Droppable @VERSION
 * http://jqueryui.com
 *
 * Copyright 2014 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/droppable/
 */
(function( factory ) {
    if ( typeof define === "function" && define.amd ) {

        // AMD. Register as an anonymous module.
        define([
            "jquery",
            "./core",
            "./widget",
            "./mouse",
            "./draggable"
        ], factory );
    } else {

        // Browser globals
        factory( jQuery );
    }
}(function( $ ) {

    $.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
                        };
                }
            };

            this._addToManager( o.scope );

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

        },

        _addToManager: function( scope ) {
            // Add the reference and positions to the manager
            $.ui.ddmanager.droppables[ scope ] = $.ui.ddmanager.droppables[ scope ] || [];
            $.ui.ddmanager.droppables[ scope ].push( this );
        },

        _splice: function( drop ) {
            var i = 0;
            for ( ; i < drop.length; i++ ) {
                if ( drop[ i ] === this ) {
                    drop.splice( i, 1 );
                }
            }
        },

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

            this._splice( drop );

            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 );
                };
            } else if ( key === "scope" ) {
                var drop = $.ui.ddmanager.droppables[ this.options.scope ];

                this._splice( drop );
                this._addToManager( value );
            }

            this._super( key, value );
        },

        _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 = $( this ).droppable( "instance" );
                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() {
        function isOverAxis( x, reference, size ) {
            return ( x >= reference ) && ( x < ( reference + size ) );
        }

        return 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 $( this ).droppable( "instance" ).options.scope === scope;
                    });

                    if ( parent.length ) {
                        parentInstance = $( parent[ 0 ] ).droppable( "instance" );
                        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 );
            }
        }
    };

    return $.ui.droppable;

}));