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/*
 * jQuery UI Position 1.8.1
 *
 * Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Position
 */
(function( $ ) {

$.ui = $.ui || {};

var horizontalPositions = /left|center|right/,
        horizontalDefault = "center",
        verticalPositions = /top|center|bottom/,
        verticalDefault = "center",
        _position = $.fn.position,
        _offset = $.fn.offset;

$.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 target = $( options.of ),
                collision = ( options.collision || "flip" ).split( " " ),
                offset = options.offset ? options.offset.split( " " ) : [ 0, 0 ],
                targetWidth,
                targetHeight,
                basePosition;

        if ( options.of.nodeType === 9 ) {
                targetWidth = target.width();
                targetHeight = target.height();
                basePosition = { top: 0, left: 0 };
        } else if ( options.of.scrollTo && options.of.document ) {
                targetWidth = target.width();
                targetHeight = target.height();
                basePosition = { top: target.scrollTop(), left: target.scrollLeft() };
        } else if ( options.of.preventDefault ) {
                // force left top to allow flipping
                options.at = "left top";
                targetWidth = targetHeight = 0;
                basePosition = { top: options.of.pageY, left: options.of.pageX };
        } else {
                targetWidth = target.outerWidth();
                targetHeight = target.outerHeight();
                basePosition = target.offset();
        }

        // force my and at to have valid horizontal and veritcal positions
        // if a value is missing or invalid, it will be converted to center 
        $.each( [ "my", "at" ], function() {
                var pos = ( options[this] || "" ).split( " " );
                if ( pos.length === 1) {
                        pos = horizontalPositions.test( pos[0] ) ?
                                pos.concat( [verticalDefault] ) :
                                verticalPositions.test( pos[0] ) ?
                                        [ horizontalDefault ].concat( pos ) :
                                        [ horizontalDefault, verticalDefault ];
                }
                pos[ 0 ] = horizontalPositions.test( pos[0] ) ? pos[ 0 ] : horizontalDefault;
                pos[ 1 ] = verticalPositions.test( pos[1] ) ? pos[ 1 ] : verticalDefault;
                options[ this ] = pos;
        });

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

        // normalize offset option
        offset[ 0 ] = parseInt( offset[0], 10 ) || 0;
        if ( offset.length === 1 ) {
                offset[ 1 ] = offset[ 0 ];
        }
        offset[ 1 ] = parseInt( offset[1], 10 ) || 0;

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

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

        basePosition.left += offset[ 0 ];
        basePosition.top += offset[ 1 ];

        return this.each(function() {
                var elem = $( this ),
                        elemWidth = elem.outerWidth(),
                        elemHeight = elem.outerHeight(),
                        position = $.extend( {}, basePosition );

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

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

                // prevent fractions (see #5280)
                position.left = parseInt( position.left );
                position.top = parseInt( position.top );

                $.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,
                                        offset: offset,
                                        my: options.my,
                                        at: options.at
                                });
                        }
                });

                if ( $.fn.bgiframe ) {
                        elem.bgiframe();
                }
                elem.offset( $.extend( position, { using: options.using } ) );
        });
};

$.ui.position = {
        fit: {
                left: function( position, data ) {
                        var win = $( window ),
                                over = position.left + data.elemWidth - win.width() - win.scrollLeft();
                        position.left = over > 0 ? position.left - over : Math.max( 0, position.left );
                },
                top: function( position, data ) {
                        var win = $( window ),
                                over = position.top + data.elemHeight - win.height() - win.scrollTop();
                        position.top = over > 0 ? position.top - over : Math.max( 0, position.top );
                }
        },

        flip: {
                left: function( position, data ) {
                        if ( data.at[0] === "center" ) {
                                return;
                        }
                        var win = $( window ),
                                over = position.left + data.elemWidth - win.width() - win.scrollLeft(),
                                myOffset = data.my[ 0 ] === "left" ?
                                        -data.elemWidth :
                                        data.my[ 0 ] === "right" ?
                                                data.elemWidth :
                                                0,
                                offset = -2 * data.offset[ 0 ];
                        position.left += position.left < 0 ?
                                myOffset + data.targetWidth + offset :
                                over > 0 ?
                                        myOffset - data.targetWidth + offset :
                                        0;
                },
                top: function( position, data ) {
                        if ( data.at[1] === "center" ) {
                                return;
                        }
                        var win = $( window ),
                                over = position.top + data.elemHeight - win.height() - win.scrollTop(),
                                myOffset = data.my[ 1 ] === "top" ?
                                        -data.elemHeight :
                                        data.my[ 1 ] === "bottom" ?
                                                data.elemHeight :
                                                0,
                                atOffset = data.at[ 1 ] === "top" ?
                                        data.targetHeight :
                                        -data.targetHeight,
                                offset = -2 * data.offset[ 1 ];
                        position.top += position.top < 0 ?
                                myOffset + data.targetHeight + offset :
                                over > 0 ?
                                        myOffset + atOffset + offset :
                                        0;
                }
        }
};

// offset setter from jQuery 1.4
if ( !$.offset.setOffset ) {
        $.offset.setOffset = function( elem, options ) {
                // set position first, in-case top/left are set even on static elem
                if ( /static/.test( $.curCSS( elem, "position" ) ) ) {
                        elem.style.position = "relative";
                }
                var curElem   = $( elem ),
                        curOffset = curElem.offset(),
                        curTop    = parseInt( $.curCSS( elem, "top",  true ), 10 ) || 0,
                        curLeft   = parseInt( $.curCSS( elem, "left", true ), 10)  || 0,
                        props     = {
                                top:  (options.top  - curOffset.top)  + curTop,
                                left: (options.left - curOffset.left) + curLeft
                        };
                
                if ( 'using' in options ) {
                        options.using.call( elem, props );
                } else {
                        curElem.css( props );
                }
        };

        $.fn.offset = function( options ) {
                var elem = this[ 0 ];
                if ( !elem || !elem.ownerDocument ) { return null; }
                if ( options ) { 
                        return this.each(function() {
                                $.offset.setOffset( this, options );
                        });
                }
                return _offset.call( this );
        };
}

}( jQuery ));