(function($) {

  $.fn.fontScaler = function(options) {
    var defaultSettings = {
      increment: 'fixed'        // fixed || variable
    , fixed: {              // fixed increment options
        size1: 75
      , size2: 100
      , size3: 125
      , size4: 150
      , id1: 'fs_small'
      , id2: 'fs_normal'
      , id3: 'fs_medium'
      , id4: 'fs_large'
      , title1: 'small'
      , title2: 'normal'
      , title3: 'medium'
      , title4: 'large'
      , character: 'A'
    }
    , variable: {            // variable increment options
        step: 5            // variable increment value in percentages
      , id1: 'fs_decrease'
      , id2: 'fs_increase'
      , title1: 'decrease'
      , title2: 'increase'
      , character1: '-'
      , character2: '+'
    }
    , store: false            // store user font-size in cookie
    , storetime: 10            // lifetime of cookie in minutes
    , target: eval(document.body)
    , containerclass: "fontScaler"
    , fx: "normal"            // normal || smooth
    , fxspeed: 100
    };

    if (options && options.fixed)
      options.fixed = $.extend({}, defaultSettings.fixed, options.fixed);

    if (options && options.variable)
      options.variable = $.extend({}, defaultSettings.variable, options.variable);
    
    var settings = new Array();
    settings = $.extend({}, defaultSettings, options);      
    
    // increment constructor

    function newfontScaler(i) {
      
      var fixed = settings.fixed;
      var variable = settings.variable;

      if (settings.increment == "fixed") {
        var fsid = fixed["id" + i];
        var fstitle = fixed["title" + i];
        var fscharacter = fixed.character;
      }
      if (settings.increment == "variable") {
        var fsid = variable["id" + i];
        var fstitle = variable["title" + i];
        var fscharacter = variable["character" + i];
      }

      if ((settings.increment == "variable" && variable["id" + i] != null) || (settings.increment == "fixed" && fixed["id" + i] != null)) {
        return $(document.createElement('a'))
        .attr('href', 'javascript:void(0)')
        .attr('id', fsid)
        .attr('title', fstitle)
        .append($(document.createTextNode(fscharacter)))
        .bind("click", function(e) { changeFontSize(i,e) })
      }
    }

    var fontSizeLinks = $(document.createElement('div'))
    .attr('class', settings.containerclass)
    .append(
      newfontScaler(1), newfontScaler(2), newfontScaler(3), newfontScaler(4)
    );

    $(this).prepend(fontSizeLinks);
    
  
    
    // fontScaler function
    
    function changeFontSize(i,event) {
      
      i = i * 1;
      var target = settings.target;      
      
      if (settings.increment == "fixed") {

        if (settings.fx == "normal") {
          $(target).css('font-size', settings.fixed["size" + i] + '%');
        }
        if (settings.fx == "smooth") {
          $(target).animate({
            fontSize: settings.fixed["size" + i] + '%'
          }, settings.fxspeed);
        }
        if ((event) && (settings.store == true)) { //case button clicked //create a cookie to store font-size
          var duration = ((settings.storetime /24) /60);
          createCookie('fontScalerFixed', (i), duration);
        }
      
      }
      
      if (settings.increment == "variable") {
        
        var currentSize = $(target).css('font-size').split("px")[0] * 1;
        
        if (event) { //case button clicked
          var pressedbutton = $(event.target);
          if (pressedbutton.hasClass("disabled")) {
            eraseCookie('fontScalerVariable');
            return false;
          }
        }      

        if (i == 1) {
          var newSize = currentSize - ((settings.variable["step"] / 100) * currentSize);
        }
        else if (i == 2) {
          var newSize = currentSize + ((settings.variable["step"] / 100) * currentSize);
          if (event) { pressedbutton.siblings().removeClass("disabled"); }
        }  
        else {
          var newSize = i;
        }

        if (settings.fx == "normal" && newSize > 10) {          
          $(target).css('font-size', newSize);
        }
        else if (settings.fx == "smooth" && newSize > 10) {
          $(target).animate({
            fontSize: newSize
          }, settings.fxspeed);
        }
        else if (event) {
          pressedbutton.toggleClass("disabled");   
        }
        
        if ((event) && (settings.store == true)) { //case button clicked //create a cookie to store font-size
          var duration = ((settings.storetime /24) /60);
          createCookie('fontScalerVariable', (newSize), duration);
        }
        
      }
      
    }
    
    var cookievalueFixed = readCookie('fontScalerFixed');
    if ((cookievalueFixed != null) && (settings.store == true)) {
      changeFontSize(cookievalueFixed);
    }
    var cookievalueVariable = readCookie('fontScalerVariable');
    if ((cookievalueVariable != null)&& (settings.store == true)) {
      changeFontSize(cookievalueVariable);
    }
    
    /* cookie functions */
    function createCookie(name, value, days) {
      if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        var expires = "; expires=" + date.toGMTString();
      }
      else var expires = "";
      document.cookie = name + "=" + value + expires + "; path=/";
    }

    function readCookie(name) {
      var nameEQ = name + "=";
      var ca = document.cookie.split(';');
      for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
      }
      return null;
    }

    function eraseCookie(name) {
      createCookie(name, "", -1);
    }


  };
})(jQuery);