/* CSS Stylesheet switching.
 *
 * $Id: style.js,v 1.1 2010/07/26 15:06:36 awux7820 Exp $
 */

function setActiveStyleSheet(title) {
    var i, a, main;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
        if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
            a.disabled = true;
            if (a.getAttribute("title") == title) a.disabled = false;
        }
    }
    createCookie("StylePicker:fontsize", title, 365);
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function toggleTextView() {
    if (getActiveStyleSheet() == "textOnly") {
        // Switch to default
        var i, a, main;
        for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
            if (a.getAttribute("rel").indexOf("style") != -1) {
                a.disabled = false;
                // Except 'Text Only' stylesheet
                if (a.getAttribute("title") == 'textOnly') a.disabled = true;
            }
        }
        setActiveStyleSheet("mediumText");
        
        document.getElementById("textview").firstChild.data = "Text only";
    } else {
        // Switch to text only
        var title = "textOnly";
        createCookie("StylePicker:fontsize", title, 365);
        var i, a, main;
        for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
            if (a.getAttribute("rel").indexOf("style") != -1) {
                a.disabled = true;
                // Except 'Text Only' stylesheet
                if (a.getAttribute("title") == 'textOnly') a.disabled = false;
            }
        }
        document.getElementById("textview").firstChild.data = "Normal";
    }
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
      && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

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 expires = "";
  document.cookie = name+"="+value+expires+"; path=/; domain";
}

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;
}

window.onload = function(e) {
	styleOnload();
}

window.onunload = function(e) {
	styleOnunload();
}


function styleOnload() {
  var cookie = readCookie("StylePicker:fontsize");
  var title = cookie ? cookie : getPreferredStyleSheet();
  if(title=="textOnly")
  {
	  setActiveStyleSheet("smaller");
	  toggleTextView();
  }
  else
  {
	  setActiveStyleSheet(title);
  }
}

function styleOnunload() {
  var title = getActiveStyleSheet();
  createCookie("StylePicker:fontsize", title, 365);
}

var cookie = readCookie("StylePicker:fontsize");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);