$(function(){
    
    $(".photo").fancybox({
        padding: 0,
        mouseWheel: false,
        autoResize: true,
        autoCenter: true,
        openEffect: 'elastic',
        closeEffect: 'elastic',
        nextEffect: 'fade',
        prevEffect: 'fade',
        loop: false,
        helpers: {
            overlay: {
                locked: false
            }
        }
    });

    $('.toggle_nav').on('click', function(){
        if($('.horizontal_nav .nav_container').css('display') === 'none'){
            $('.toggle_icon').attr('class', 'fa fa-times toggle_icon');
        } else {
            $('.toggle_icon').attr('class', 'fa fa-bars toggle_icon');
        }
        $('.horizontal_nav .nav_container').slideToggle(function(){
        if($('.horizontal_nav .nav_container').css('display') === 'none'){
            $('.horizontal_nav .nav_container').css('display', '');
        }
        });
    });
    
    function change_image(){
        current_header_image++;
        if(current_header_image >= header_images.length){
            current_header_image = 0;
        }
        $(".horizontal_nav_background_transition").css("background-image", "url(" + header_images_path + header_images[current_header_image] + ")");
        $(".horizontal_nav_background_transition").fadeIn(1000, function(){
            $(".horizontal_nav_background").css("background-image", "url(" + header_images_path + header_images[current_header_image] + ")");
            $(".horizontal_nav_background_transition").fadeOut(300);
        });
        window.setTimeout(function(){change_image();}, interval);
    }
    
    $(".subnav_dropdown").change(function(){
        var address = $(this).val();
        address = address.split(":-");
        if(address[1] == "blank") {
            var win = window.open(address[0], "_blank");
            if(win) {
                win.focus();
            } else {
                alert('Prosíme, povolte na této stránce vyskakovací okna.');
            }
        } else {
            window.location.href = $(this).val();
        }
    });
    
    var header_images_path = "img/environment/";
    var header_images = ["background_blue.jpg", "background_red.jpg", "background_yellow.jpg"];
    var interval = 10000;
    var current_header_image = Math.floor(Math.random()*header_images.length);
    $(".horizontal_nav_background").css("background-image", "url(" + header_images_path + header_images[current_header_image] + ")");
    window.setTimeout(function(){change_image();}, interval);

    var padding = ($(".article_image").width() / 100 * 42) - $(".article_header").height() + 24;
    if(padding > 0) {
        $(".article_image").css("paddingBottom", padding);
    } else {
        $(".article_image").css("paddingBottom", 0);
    }
    $(".article_image").css("minHeight", $(".article_header").height() + 24);
    
    $(window).resize(function(){
        var padding = ($(".article_image").width() / 100 * 42) - $(".article_header").height() + 24;
        if(padding > 0) {
            $(".article_image").css("paddingBottom", padding);
        } else {
            $(".article_image").css("paddingBottom", 0);
        }
        $(".article_image").css("minHeight", $(".article_header").height() + 24);
    });
    
});