var DEFAULT_TEXT_SIZE = 14;
var flag_display_image = true;

$(function() {
      /*$('a[href*=#]:not([href=#])').click(function() {
        if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
          var target = $(this.hash);
          target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
          if (target.length) {
            $('html,body').animate({
              scrollTop: target.offset().top
            }, 1000);
            //return false;
          }
        }
      });*/
    $('#accessibility-bar').hide();
    $('#techsheet').hide();
    $("#color-swap-white").addClass('active');
    });

function setTextSize(textsize){
    return parseInt(textsize.slice(0,2));
}

function incrementTextSize(textsize, maxtextsize, increment) {
    var fontsize = 0;
    if(textsize <= maxtextsize){
        fontsize = textsize + increment;
        return fontsize/DEFAULT_TEXT_SIZE;
    }else{
        return textsize/DEFAULT_TEXT_SIZE;
    }
}

function decreaseTextSize(textsize, mintextsize, increment) {
    var fontsize = 0;
    if(textsize > mintextsize){
        fontsize = textsize - increment;
        return fontsize/DEFAULT_TEXT_SIZE;
    }else{
        return textsize/DEFAULT_TEXT_SIZE;
    }
}

$("#font-increase1").click(function(event){
    var textsize = setTextSize($(".main-book").css('font-size'));
    $(".main-book").animate({"font-size":""+incrementTextSize(textsize,42,2)+"em"});
});

$("#font-decrease1").click(function(event){
    var textsize = setTextSize($(".main-book").css('font-size'));
    $(".main-book").animate({"font-size":""+decreaseTextSize(textsize,10,2)+"em"});
});

$("#font-default").click(function(event){
    event.preventDefault();
    $(".main-book").animate({"font-size":"1em"});
});

$("#insert-images").click(function(event){
    if (flag_display_image == false){
        $("<p class=\"align-center\"><img src=\"images/diagram1.png\" /></p><p class=\"align-center\">Figure 1: The AD production process</p>").appendTo($("#fig1"));
        $("<p class=\"align-center\"><img src=\"images/diagram2.png\" /></p><p class=\"align-center\">Figure 1: The AD production process</p>").appendTo($("#fig2"));
        flag_display_image = true;
    }
});

$("#remove-images").click(function(event){
    event.preventDefault();
    $("#fig1").empty();
    $("#fig2").empty();
    flag_display_image = false
});

$("#color-swap-black").click(function(){
    $("#color-swap-yellow").removeClass();
    $("#color-swap-white").removeClass();
    $(this).addClass('active');
    $("body").removeClass()
             .addClass('black-helper');
});

$("#color-swap-white").click(function(){
    $("#color-swap-black").removeClass();
    $("#color-swap-yellow").removeClass();
    $(this).addClass('active');
    $("body").removeClass();
});

$("#color-swap-yellow").click(function(){
    $("#color-swap-black").removeClass();
    $("#color-swap-white").removeClass();
    $(this).addClass('active');
    $("body").removeClass()
             .addClass('yellow-helper');
});


$('#accessibility-toggle button').click(function(event){
    if($('#accessibility-bar').attr('aria-expanded') == "true" ){
        $(this).html('Opções de acessibilidade');
        $('#accessibility-bar').hide()
                               .attr('aria-expanded', 'false');
    }else{
        $('#accessibility-bar').show();
        $(this).html('Esconder opções');
        $('#accessibility-bar').attr('aria-expanded', 'true');
    }
});

$('#technicalsheet').click(function(event) {
    if($('#techsheet').attr('aria-expanded') == "true" ){
        $('#techsheet').slideUp()
                       .attr('aria-expanded', 'false');
    }else{
        $('#techsheet').slideDown()
                       .attr('aria-expanded', 'true');
        $('html, body').animate({scrollTop: $(document).height()}, 'slow');
    }
});