/**
 *  EZ-Sticky-Footer -- jQuery plugin to make the page footer stick to the
 *                      bottom of the page.
 *
 *  Project URLs:   http://maratbn.com/projects/ez-sticky-footer
 *                  https://github.com/maratbn/EZ-Sticky-Footer
 *                  https://plugins.jquery.com/ez-sticky-footer
 *
 *  Demo URL:       http://www.maratbn.com/misc/ez-sticky-footer-demo/example.html
 *
 *  Version:        0.1.3
 *
 *  Module:         jquery.ez-sticky-footer-0.1.3-src.js
 *
 *  Description:    The EZ-Sticky-Footer jQuery plugin version 0.1.3 source.
 *
 *  Copyright (c) 2013-2015 Marat Nepomnyashy  http://maratbn.com  maratbn@gmail
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *      * Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 *      * Redistributions in binary form must reproduce the above copyright
 *        notice, this list of conditions and the following disclaimer in the
 *        documentation and/or other materials provided with the distribution.
 *      * Neither the name of the <organization> nor the
 *        names of its contributors may be used to endorse or promote products
 *        derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

(function($) {
    $(document).ready(function() {
            var jqWindow = $(window);
            var jqHtml = $('html');
            var jqBody = $('body');
            var jqPageContainer = $('.jq-ez-sticky-footer-page-container');
            var jqPageFooter = $('.jq-ez-sticky-footer-page-footer');
            var jqContentExpander = $('.jq-ez-sticky-footer-content-expander');

            function _getPageHeight() {

                function _getHtmlMargins() {
                    function _toNum(strMargin) {
                        return 1 * strMargin.replace('px', "");
                    }
                    return _toNum(jqHtml.css('margin-top')) +
                            _toNum(jqHtml.css('margin-bottom')) +
                            _toNum(jqHtml.css('padding-top')) +
                            _toNum(jqHtml.css('padding-bottom'));
                }

                return _getHtmlMargins() + jqBody.outerHeight(true);
            }

            //  The following setting of self-cancelling margin and padding onto the
            //  page container is to make sure that it entirely covers any margins of
            //  its child components within its height.
            jqPageContainer.css('padding', '1px 0');
            jqPageContainer.css('margin', '-1px 0');

            function _adjustExpander() {
                var heightPageContainer = jqPageContainer.outerHeight(true);
                var heightExpander = jqContentExpander.height();
                var heightContainerNoExpander = heightPageContainer - heightExpander;

                var heightExpanderNew = 0;
                if (heightContainerNoExpander < jqWindow.height()) {
                    var heightDeltaBody = _getPageHeight() - heightPageContainer;
                    heightExpanderNew = jqWindow.height() - heightContainerNoExpander
                                                                    - heightDeltaBody;
                }

                jqContentExpander.height(heightExpanderNew);
            }

            _adjustExpander();

            jqWindow.bind('resize', function() {
                    _adjustExpander();
                });

            var heightPageLast = null;

            function _adjustExpanderIfNecessary() {
                if (_getPageHeight() == heightPageLast) return;

                _adjustExpander();
                heightPageLast = _getPageHeight();
            }

            _adjustExpanderIfNecessary();

            var flagAdjustingExpander = false;

            jqWindow.bind('DOMSubtreeModified', function() {
                    if (flagAdjustingExpander) return;

                    flagAdjustingExpander = true;

                    _adjustExpanderIfNecessary()

                    flagAdjustingExpander = false;
                });

            if (!$.ezsf) $.ezsf = {
                    adjustExpander:             function() {_adjustExpander();},
                    adjustExpanderIfNecessary:  function() {_adjustExpanderIfNecessary();}
                };
        });

    //  Adjusting the expander after the document is loaded as well just in case any DOM change
    //  effecting the layout was missed.
    $(document).load(function() {
            _adjustExpanderIfNecessary();
        });
})(jQuery);