function initMenuPosition() {
    var $header = $('.web-header:first');
    var $logo_container = $('.logo-container:first');
    if ($header.hasClass('menu-position-bottom')) {
        $logo_container.prependTo($logo_container.parent());
    }
    else {
        $logo_container.appendTo($logo_container.parent());
    }
}

function disableFixedHeader() {
    $(".web-header").prev(".fixed-header-spacer").hide();
}

function enableFixedHeader() {
    $(window).resize();
}

$(document).ready(function () {
    var $menu = $('.menu');

    $('.menu-container .menu-button').click(function () {
        if ($menu.hasClass('show')) {
            $menu.removeClass('show');
        }
        else {
            $menu.addClass('show');
        }
    });

    var $zona_logo = $('div.zona_logo:first');
    var $menu_element = $('#menu div.pwcre-element:first .pwcem-menu');
    var $web_header = $('div.web-header:first');

    var menu_position = $menu_element.position();
    var menu_height = $menu_element.height();
    var max_left_position = 0;
    var min_left_position = 99999;
    var zona_offset = $zona_logo.offset();
    $zona_logo.find('div.pwcre-element').each(function () {
        var element_offset = $(this).offset();
        var element_position = {
            left: element_offset.left - zona_offset.left,
            top: element_offset.top - zona_offset.top
        };
        var element_width = $(this).width();
        if (element_position.top < menu_position.top + menu_height) {
            var left_position = element_position.left + element_width;
            if (left_position > max_left_position) {
                max_left_position = left_position;
            }
            if (element_position.left < min_left_position) {
                min_left_position = element_position.left;
            }
        }
    });

    var prev_window_width = 0;
    var resize_timer = null;
    var is_administration = ($('#admin-container').length > 0);
    // Pokud je menu prekryte jinym prvkem, dojde k zalomeni.
    if (!is_administration && (!$web_header.hasClass('menu-position-bottom') && !$web_header.hasClass('menu-position-top'))) {
        $(window).resize(function () {
            var window_width = proweb.getViewportWidth();
            var logo_container_width = $zona_logo.outerWidth(true);
            if (window_width != prev_window_width) {
                prev_window_width = window_width;
                if (resize_timer) window.clearTimeout(resize_timer);
                resize_timer = window.setTimeout(function () {
                    resize_timer = null;
                    $web_header.removeClass('break-elements');
                    if (logo_container_width + 40 >= window_width) {
                        var menu_position = $menu_element.offset();
                        var zona_offset = $zona_logo.offset();
                        if ($web_header.hasClass('menu-position-left')) {
                            var menu_position_right = menu_position.left - zona_offset.left + $menu_element.outerWidth(true);
                            if (min_left_position < menu_position_right) {
                                $web_header.addClass('break-elements');
                            }
                        }
                        else {
                            var menu_position_left = menu_position.left - zona_offset.left;
                            if (max_left_position > menu_position_left) {
                                $web_header.addClass('break-elements');
                            }
                        }
                    }
                    header_height = $web_header.height();
                    if ($fixed_header_spacer) {
                        $fixed_header_spacer.css('height', header_height);
                    }
                }, 300);
            }
        });
    }

    var $web_controller = $('#web-container:first');
    var web_controller_offset_top = 0;
    var header_height = $web_header.height();
    var $fixed_header_spacer = null;
    var fixed_header_inited = false;
    var web_header_offset_top = 0;
    var doFixedHeader = function () {
        if ($web_header.hasClass('header-fixed') || $web_header.hasClass('header-fixed-disabled')) {
            var scroll_top, viewport_height;
            $web_header.removeClass('header-fixed header-fixed-disabled');

            if (!fixed_header_inited) {
                var header_offset = $web_header.offset();
                web_header_offset_top = header_offset.top;
                $fixed_header_spacer = $('<div class="fixed-header-spacer"></div>').prependTo($web_header.parent()).css('height', header_height);
                fixed_header_inited = true;
            }

            if ($web_controller.length > 0 && proweb.defined('proweb.content.administration.admin_mode') && proweb.content.administration.admin_mode.getActiveSidMode() == 'md') {
                scroll_top = $web_controller.scrollTop();
                web_controller_offset_top = $web_controller.offset().top;
                viewport_height = proweb.getViewportHeight();
                if (header_height / viewport_height > 0.33 || scroll_top == 0) {
                    $web_header.css({
                        position: '',
                        width: '',
                        top: ''
                    });
                    if (is_administration && !$web_header.hasClass('header-fixed-disabled') && proweb.defined('proweb.content.administration.element_menu')) {
                        proweb.content.administration.element_menu.refreshPositions();
                        proweb.content.administration.control_menu.fixOverlapping();
                    }
                    $web_header.addClass('header-fixed-disabled');
                    $fixed_header_spacer.hide();
                }
                else {
                    $web_header.css({
                        position: 'absolute',
                        width: '100%',
                        top: scroll_top
                    });
                    $web_header.addClass('header-fixed');
                    $fixed_header_spacer.show();
                }
            }
            else {
                scroll_top = $(window).scrollTop();
                viewport_height = proweb.getViewportHeight();
                if (header_height / viewport_height > 0.33 || web_header_offset_top - scroll_top > 0 || $web_header.hasClass('break-elements')) {
                    if (is_administration && !$web_header.hasClass('header-fixed-disabled') && proweb.defined('proweb.content.administration.element_menu')) {
                        proweb.content.administration.element_menu.refreshPositions();
                        proweb.content.administration.control_menu.fixOverlapping();
                    }
                    $web_header.addClass('header-fixed-disabled');
                    $fixed_header_spacer.hide();
                }
                else {
                    $web_header.addClass('header-fixed');
                    $fixed_header_spacer.show();
                }
            }
        }
    };

    $(window).resize(function () {
        header_height = $web_header.height();
        if ($fixed_header_spacer) {
            $fixed_header_spacer.css('height', header_height);
        }
        doFixedHeader();
    });

    $(window).scroll(function () {
        doFixedHeader();
    });

    $web_controller.scroll(function () {
        doFixedHeader();
    });

    $(window).resize();
});