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/*!
 * jQuery UI Position 1.13.2
 * http://jqueryui.com
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/position/
 */

//>>label: Position
//>>group: Core
//>>description: Positions elements relative to other elements.
//>>docs: http://api.jqueryui.com/position/
//>>demos: http://jqueryui.com/position/

( function( factory ) {
    "use strict";

    if ( typeof define === "function" && define.amd ) {

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

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

    ( function() {
        var cachedScrollbarWidth,
            max = Math.max,
            abs = Math.abs,
            rhorizontal = /left|center|right/,
            rvertical = /top|center|bottom/,
            roffset = /[\+\-]\d+(\.[\d]+)?%?/,
            rposition = /^\w+/,
            rpercent = /%$/,
            _position = $.fn.position;

        function getOffsets( offsets, width, height ) {
            return [
                parseFloat( offsets[ 0 ] ) * ( rpercent.test( offsets[ 0 ] ) ? width / 100 : 1 ),
                parseFloat( offsets[ 1 ] ) * ( rpercent.test( offsets[ 1 ] ) ? height / 100 : 1 )
            ];
        }

        function parseCss( element, property ) {
            return parseInt( $.css( element, property ), 10 ) || 0;
        }

        function isWindow( obj ) {
            return obj != null && obj === obj.window;
        }

        function getDimensions( elem ) {
            var raw = elem[ 0 ];
            if ( raw.nodeType === 9 ) {
                return {
                    width: elem.width(),
                    height: elem.height(),
                    offset: { top: 0, left: 0 }
                };
            }
            if ( isWindow( raw ) ) {
                return {
                    width: elem.width(),
                    height: elem.height(),
                    offset: { top: elem.scrollTop(), left: elem.scrollLeft() }
                };
            }
            if ( raw.preventDefault ) {
                return {
                    width: 0,
                    height: 0,
                    offset: { top: raw.pageY, left: raw.pageX }
                };
            }
            return {
                width: elem.outerWidth(),
                height: elem.outerHeight(),
                offset: elem.offset()
            };
        }

        $.position = {
            scrollbarWidth: function() {
                if ( cachedScrollbarWidth !== undefined ) {
                    return cachedScrollbarWidth;
                }
                var w1, w2,
                    div = $( "<div style=" +
                        "'display:block;position:absolute;width:200px;height:200px;overflow:hidden;'>" +
                        "<div style='height:300px;width:auto;'></div></div>" ),
                    innerDiv = div.children()[ 0 ];

                $( "body" ).append( div );
                w1 = innerDiv.offsetWidth;
                div.css( "overflow", "scroll" );

                w2 = innerDiv.offsetWidth;

                if ( w1 === w2 ) {
                    w2 = div[ 0 ].clientWidth;
                }

                div.remove();

                return ( cachedScrollbarWidth = w1 - w2 );
            },
            getScrollInfo: function( within ) {
                var overflowX = within.isWindow || within.isDocument ? "" :
                        within.element.css( "overflow-x" ),
                    overflowY = within.isWindow || within.isDocument ? "" :
                        within.element.css( "overflow-y" ),
                    hasOverflowX = overflowX === "scroll" ||
                        ( overflowX === "auto" && within.width < within.element[ 0 ].scrollWidth ),
                    hasOverflowY = overflowY === "scroll" ||
                        ( overflowY === "auto" && within.height < within.element[ 0 ].scrollHeight );
                return {
                    width: hasOverflowY ? $.position.scrollbarWidth() : 0,
                    height: hasOverflowX ? $.position.scrollbarWidth() : 0
                };
            },
            getWithinInfo: function( element ) {
                var withinElement = $( element || window ),
                    isElemWindow = isWindow( withinElement[ 0 ] ),
                    isDocument = !!withinElement[ 0 ] && withinElement[ 0 ].nodeType === 9,
                    hasOffset = !isElemWindow && !isDocument;
                return {
                    element: withinElement,
                    isWindow: isElemWindow,
                    isDocument: isDocument,
                    offset: hasOffset ? $( element ).offset() : { left: 0, top: 0 },
                    scrollLeft: withinElement.scrollLeft(),
                    scrollTop: withinElement.scrollTop(),
                    width: withinElement.outerWidth(),
                    height: withinElement.outerHeight()
                };
            }
        };

        $.fn.position = function( options ) {
            if ( !options || !options.of ) {
                return _position.apply( this, arguments );
            }

            // Make a copy, we don't want to modify arguments
            options = $.extend( {}, options );

            var atOffset, targetWidth, targetHeight, targetOffset, basePosition, dimensions,

                // Make sure string options are treated as CSS selectors
                target = typeof options.of === "string" ?
                    $( document ).find( options.of ) :
                    $( options.of ),

                within = $.position.getWithinInfo( options.within ),
                scrollInfo = $.position.getScrollInfo( within ),
                collision = ( options.collision || "flip" ).split( " " ),
                offsets = {};

            dimensions = getDimensions( target );
            if ( target[ 0 ].preventDefault ) {

                // Force left top to allow flipping
                options.at = "left top";
            }
            targetWidth = dimensions.width;
            targetHeight = dimensions.height;
            targetOffset = dimensions.offset;

            // Clone to reuse original targetOffset later
            basePosition = $.extend( {}, targetOffset );

            // Force my and at to have valid horizontal and vertical positions
            // if a value is missing or invalid, it will be converted to center
            $.each( [ "my", "at" ], function() {
                var pos = ( options[ this ] || "" ).split( " " ),
                    horizontalOffset,
                    verticalOffset;

                if ( pos.length === 1 ) {
                    pos = rhorizontal.test( pos[ 0 ] ) ?
                        pos.concat( [ "center" ] ) :
                        rvertical.test( pos[ 0 ] ) ?
                            [ "center" ].concat( pos ) :
                            [ "center", "center" ];
                }
                pos[ 0 ] = rhorizontal.test( pos[ 0 ] ) ? pos[ 0 ] : "center";
                pos[ 1 ] = rvertical.test( pos[ 1 ] ) ? pos[ 1 ] : "center";

                // Calculate offsets
                horizontalOffset = roffset.exec( pos[ 0 ] );
                verticalOffset = roffset.exec( pos[ 1 ] );
                offsets[ this ] = [
                    horizontalOffset ? horizontalOffset[ 0 ] : 0,
                    verticalOffset ? verticalOffset[ 0 ] : 0
                ];

                // Reduce to just the positions without the offsets
                options[ this ] = [
                    rposition.exec( pos[ 0 ] )[ 0 ],
                    rposition.exec( pos[ 1 ] )[ 0 ]
                ];
            } );

            // Normalize collision option
            if ( collision.length === 1 ) {
                collision[ 1 ] = collision[ 0 ];
            }

            if ( options.at[ 0 ] === "right" ) {
                basePosition.left += targetWidth;
            } else if ( options.at[ 0 ] === "center" ) {
                basePosition.left += targetWidth / 2;
            }

            if ( options.at[ 1 ] === "bottom" ) {
                basePosition.top += targetHeight;
            } else if ( options.at[ 1 ] === "center" ) {
                basePosition.top += targetHeight / 2;
            }

            atOffset = getOffsets( offsets.at, targetWidth, targetHeight );
            basePosition.left += atOffset[ 0 ];
            basePosition.top += atOffset[ 1 ];

            return this.each( function() {
                var collisionPosition, using,
                    elem = $( this ),
                    elemWidth = elem.outerWidth(),
                    elemHeight = elem.outerHeight(),
                    marginLeft = parseCss( this, "marginLeft" ),
                    marginTop = parseCss( this, "marginTop" ),
                    collisionWidth = elemWidth + marginLeft + parseCss( this, "marginRight" ) +
                        scrollInfo.width,
                    collisionHeight = elemHeight + marginTop + parseCss( this, "marginBottom" ) +
                        scrollInfo.height,
                    position = $.extend( {}, basePosition ),
                    myOffset = getOffsets( offsets.my, elem.outerWidth(), elem.outerHeight() );

                if ( options.my[ 0 ] === "right" ) {
                    position.left -= elemWidth;
                } else if ( options.my[ 0 ] === "center" ) {
                    position.left -= elemWidth / 2;
                }

                if ( options.my[ 1 ] === "bottom" ) {
                    position.top -= elemHeight;
                } else if ( options.my[ 1 ] === "center" ) {
                    position.top -= elemHeight / 2;
                }

                position.left += myOffset[ 0 ];
                position.top += myOffset[ 1 ];

                collisionPosition = {
                    marginLeft: marginLeft,
                    marginTop: marginTop
                };

                $.each( [ "left", "top" ], function( i, dir ) {
                    if ( $.ui.position[ collision[ i ] ] ) {
                        $.ui.position[ collision[ i ] ][ dir ]( position, {
                            targetWidth: targetWidth,
                            targetHeight: targetHeight,
                            elemWidth: elemWidth,
                            elemHeight: elemHeight,
                            collisionPosition: collisionPosition,
                            collisionWidth: collisionWidth,
                            collisionHeight: collisionHeight,
                            offset: [ atOffset[ 0 ] + myOffset[ 0 ], atOffset [ 1 ] + myOffset[ 1 ] ],
                            my: options.my,
                            at: options.at,
                            within: within,
                            elem: elem
                        } );
                    }
                } );

                if ( options.using ) {

                    // Adds feedback as second argument to using callback, if present
                    using = function( props ) {
                        var left = targetOffset.left - position.left,
                            right = left + targetWidth - elemWidth,
                            top = targetOffset.top - position.top,
                            bottom = top + targetHeight - elemHeight,
                            feedback = {
                                target: {
                                    element: target,
                                    left: targetOffset.left,
                                    top: targetOffset.top,
                                    width: targetWidth,
                                    height: targetHeight
                                },
                                element: {
                                    element: elem,
                                    left: position.left,
                                    top: position.top,
                                    width: elemWidth,
                                    height: elemHeight
                                },
                                horizontal: right < 0 ? "left" : left > 0 ? "right" : "center",
                                vertical: bottom < 0 ? "top" : top > 0 ? "bottom" : "middle"
                            };
                        if ( targetWidth < elemWidth && abs( left + right ) < targetWidth ) {
                            feedback.horizontal = "center";
                        }
                        if ( targetHeight < elemHeight && abs( top + bottom ) < targetHeight ) {
                            feedback.vertical = "middle";
                        }
                        if ( max( abs( left ), abs( right ) ) > max( abs( top ), abs( bottom ) ) ) {
                            feedback.important = "horizontal";
                        } else {
                            feedback.important = "vertical";
                        }
                        options.using.call( this, props, feedback );
                    };
                }

                elem.offset( $.extend( position, { using: using } ) );
            } );
        };

        $.ui.position = {
            fit: {
                left: function( position, data ) {
                    var within = data.within,
                        withinOffset = within.isWindow ? within.scrollLeft : within.offset.left,
                        outerWidth = within.width,
                        collisionPosLeft = position.left - data.collisionPosition.marginLeft,
                        overLeft = withinOffset - collisionPosLeft,
                        overRight = collisionPosLeft + data.collisionWidth - outerWidth - withinOffset,
                        newOverRight;

                    // Element is wider than within
                    if ( data.collisionWidth > outerWidth ) {

                        // Element is initially over the left side of within
                        if ( overLeft > 0 && overRight <= 0 ) {
                            newOverRight = position.left + overLeft + data.collisionWidth - outerWidth -
                                withinOffset;
                            position.left += overLeft - newOverRight;

                            // Element is initially over right side of within
                        } else if ( overRight > 0 && overLeft <= 0 ) {
                            position.left = withinOffset;

                            // Element is initially over both left and right sides of within
                        } else {
                            if ( overLeft > overRight ) {
                                position.left = withinOffset + outerWidth - data.collisionWidth;
                            } else {
                                position.left = withinOffset;
                            }
                        }

                        // Too far left -> align with left edge
                    } else if ( overLeft > 0 ) {
                        position.left += overLeft;

                        // Too far right -> align with right edge
                    } else if ( overRight > 0 ) {
                        position.left -= overRight;

                        // Adjust based on position and margin
                    } else {
                        position.left = max( position.left - collisionPosLeft, position.left );
                    }
                },
                top: function( position, data ) {
                    var within = data.within,
                        withinOffset = within.isWindow ? within.scrollTop : within.offset.top,
                        outerHeight = data.within.height,
                        collisionPosTop = position.top - data.collisionPosition.marginTop,
                        overTop = withinOffset - collisionPosTop,
                        overBottom = collisionPosTop + data.collisionHeight - outerHeight - withinOffset,
                        newOverBottom;

                    // Element is taller than within
                    if ( data.collisionHeight > outerHeight ) {

                        // Element is initially over the top of within
                        if ( overTop > 0 && overBottom <= 0 ) {
                            newOverBottom = position.top + overTop + data.collisionHeight - outerHeight -
                                withinOffset;
                            position.top += overTop - newOverBottom;

                            // Element is initially over bottom of within
                        } else if ( overBottom > 0 && overTop <= 0 ) {
                            position.top = withinOffset;

                            // Element is initially over both top and bottom of within
                        } else {
                            if ( overTop > overBottom ) {
                                position.top = withinOffset + outerHeight - data.collisionHeight;
                            } else {
                                position.top = withinOffset;
                            }
                        }

                        // Too far up -> align with top
                    } else if ( overTop > 0 ) {
                        position.top += overTop;

                        // Too far down -> align with bottom edge
                    } else if ( overBottom > 0 ) {
                        position.top -= overBottom;

                        // Adjust based on position and margin
                    } else {
                        position.top = max( position.top - collisionPosTop, position.top );
                    }
                }
            },
            flip: {
                left: function( position, data ) {
                    var within = data.within,
                        withinOffset = within.offset.left + within.scrollLeft,
                        outerWidth = within.width,
                        offsetLeft = within.isWindow ? within.scrollLeft : within.offset.left,
                        collisionPosLeft = position.left - data.collisionPosition.marginLeft,
                        overLeft = collisionPosLeft - offsetLeft,
                        overRight = collisionPosLeft + data.collisionWidth - outerWidth - offsetLeft,
                        myOffset = data.my[ 0 ] === "left" ?
                            -data.elemWidth :
                            data.my[ 0 ] === "right" ?
                                data.elemWidth :
                                0,
                        atOffset = data.at[ 0 ] === "left" ?
                            data.targetWidth :
                            data.at[ 0 ] === "right" ?
                                -data.targetWidth :
                                0,
                        offset = -2 * data.offset[ 0 ],
                        newOverRight,
                        newOverLeft;

                    if ( overLeft < 0 ) {
                        newOverRight = position.left + myOffset + atOffset + offset + data.collisionWidth -
                            outerWidth - withinOffset;
                        if ( newOverRight < 0 || newOverRight < abs( overLeft ) ) {
                            position.left += myOffset + atOffset + offset;
                        }
                    } else if ( overRight > 0 ) {
                        newOverLeft = position.left - data.collisionPosition.marginLeft + myOffset +
                            atOffset + offset - offsetLeft;
                        if ( newOverLeft > 0 || abs( newOverLeft ) < overRight ) {
                            position.left += myOffset + atOffset + offset;
                        }
                    }
                },
                top: function( position, data ) {
                    var within = data.within,
                        withinOffset = within.offset.top + within.scrollTop,
                        outerHeight = within.height,
                        offsetTop = within.isWindow ? within.scrollTop : within.offset.top,
                        collisionPosTop = position.top - data.collisionPosition.marginTop,
                        overTop = collisionPosTop - offsetTop,
                        overBottom = collisionPosTop + data.collisionHeight - outerHeight - offsetTop,
                        top = data.my[ 1 ] === "top",
                        myOffset = top ?
                            -data.elemHeight :
                            data.my[ 1 ] === "bottom" ?
                                data.elemHeight :
                                0,
                        atOffset = data.at[ 1 ] === "top" ?
                            data.targetHeight :
                            data.at[ 1 ] === "bottom" ?
                                -data.targetHeight :
                                0,
                        offset = -2 * data.offset[ 1 ],
                        newOverTop,
                        newOverBottom;
                    if ( overTop < 0 ) {
                        newOverBottom = position.top + myOffset + atOffset + offset + data.collisionHeight -
                            outerHeight - withinOffset;
                        if ( newOverBottom < 0 || newOverBottom < abs( overTop ) ) {
                            position.top += myOffset + atOffset + offset;
                        }
                    } else if ( overBottom > 0 ) {
                        newOverTop = position.top - data.collisionPosition.marginTop + myOffset + atOffset +
                            offset - offsetTop;
                        if ( newOverTop > 0 || abs( newOverTop ) < overBottom ) {
                            position.top += myOffset + atOffset + offset;
                        }
                    }
                }
            },
            flipfit: {
                left: function() {
                    $.ui.position.flip.left.apply( this, arguments );
                    $.ui.position.fit.left.apply( this, arguments );
                },
                top: function() {
                    $.ui.position.flip.top.apply( this, arguments );
                    $.ui.position.fit.top.apply( this, arguments );
                }
            }
        };

    } )();

    return $.ui.position;

} );