/* 
 文字サイズ・背景色変更スクリプト StyleChange.js
*/

function setStyle(title) {
  var i, a, main;
	var browser = "";

	browser = navigator.userAgent.toLowerCase();
	if(browser.indexOf("safari") != -1){
		//safari対応
//window.alert(title);
	  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
  	  if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
				if(title != "null"){
					if(a.getAttribute("title") == title){
  		  	  a.disabled = false;
					}
				}
	    }
  	}
	}else{
	  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;
	    }
  	}
	}
}

function setFont(title){
	switch(title){
		case "S":
			document.body.style.fontSize = "70%";
			break;
		case "M":
			document.body.style.fontSize = "90%";
			break;
		case "L":
			document.body.style.fontSize = "115%";
			break;
		case "EX":
			document.body.style.fontSize = "130%";
			break;
	}
}

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 getActiveFontSize(){
	var a, b;
	a = document.body.style.fontSize;
	switch(a){
		case "70%":
			b = "S";
			break;
		case "90%":
			b = "M";
			break;
		case "115%":
			b = "L";
			break;
		case "130%":
			b = "EX";
			break;
	}
	return b;
	return null;
}

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=/";
}

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) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setStyle(title);

	var cookieF = readCookie("font");
	var titleF = cookieF ? cookieF : "M";
	setFont(titleF);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
	var font = getActiveFontSize();
  createCookie("style", title, 365);
	createCookie("font", font, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setStyle(title);

var cookieF = readCookie("font");
var titleF = cookieF ? cookieF : "M";
setFont(titleF);