var CookieUtils = {
	createCookie: function(name, value, days) {
  	var expires;
    if (!days) {
    	expires = "";
    } else {
      var date = new Date();
      date.setTime(date.getTime()+(days * 24 * 60 * 60 * 1000));
      expires = "; expires=" + date.toGMTString();
    } 
    document.cookie = name + "=" + value + expires + "; path=/";
	},

  readCookie: function(name) {
    var nameEQ = name + "=";
    var cookies = document.cookie.split(';');
    for(var i = 0; i < cookies.length; i++) {
      var c = cookies[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;
  },
    
  eraseCookie: function(name) {
  	CookieUtils.createCookie(name, "", -1);   
  }
};

var VisitCentric = {
	baseUrl: null, site: null, interval: null,
	pageViewId: null,
	pingElement: null,
	
	addPageView: function(baseUrl, site, interval) {
        VisitCentric.baseUrl = baseUrl;
        VisitCentric.site = site;
        VisitCentric.interval = interval;

        var url = VisitCentric.baseUrl + "/addPageView.html?" + 
            "site=" + escape(VisitCentric.site) + 
            "&url=" + encodeURIComponent(location.href) + 
            "&userAgent=" + escape(navigator.userAgent) +         
            "&referrerUrl=" + encodeURIComponent(document.referrer);
            
        var visitor = VisitCentric.getVisitor();    
        if ( visitor != null ) {
        	url = url + "&visitor=" + escape(visitor);
        }
        
        var visit = VisitCentric.getVisit();
        if ( visit != null ) {
            url = url + "&visit=" + visit;
        }
        document.write('<script type="text/javascript" src="' + url + '"></s'+'cript>');
        document.write('<script type="text/javascript" src="' + baseUrl+ '/js/inviteFormInvoker.js"></s'+'cript>');
	},
	
	setPageViewId: function(pageViewId) {
		VisitCentric.pageViewId = pageViewId;
		if(VisitCentric.liveChatImagePath){
			LiveChatInvoker.insertChatButton(VisitCentric.baseUrl, VisitCentric.liveChatImagePath);
		}
		setInterval(VisitCentric.ping, VisitCentric.interval);
	},

	ping: function() {
        var parent = document.getElementById('VisitCentricScript');
        
        var invokerFrame = document.getElementById('chatInvitationFormInvoker')
        if (invokerFrame) {
        	parent.removeChild(invokerFrame);
        }
		VisitCentric.createScriptElement('pingElement', VisitCentric.getUpdateUrl(false));      
	},
	
	createScriptElement: function (id, source) {
    var container = document.getElementById('VisitCentricScript')    
    var script = document.getElementById(id);
    if(script) {
        container.removeChild(script);
    }
    script = document.createElement("script");
    script.id = id;
    script.src = source;
    document.getElementById('VisitCentricScript').appendChild(script);
	},
	
	createIFrameElement: function(id, source){
		var result = document.getElementById(id);
    if(!result) {
        result = document.createElement("iframe");
        result.id = id;
        result.style.display = "none";
        document.getElementById('VisitCentricScript').appendChild(result);
    }
    result.src = source; 
	},
		
	createVisitor: function(value) {		
		VisitCentric.createCookie("visitor", value, 5 * 365);
	},
	
	getVisitor: function() {
		return VisitCentric.readCookie("visitor");
	},
	
	createVisit: function(value) {
		VisitCentric.createCookie("visit", value);
	},
	
	getVisit: function() {
		return VisitCentric.readCookie("visit");
	},
	
	createCookie: function (name, value, days) {
		var expires;
        if (!days) {
        	expires = "";
        } else {
            var date = new Date();
            date.setTime(date.getTime()+(days * 24 * 60 * 60 * 1000));
            expires = "; expires=" + date.toGMTString();
        } 
        document.cookie = name + "=" + value + expires + "; path=/";
	},

  readCookie: function(name) {
      var nameEQ = name + "=";
      var cookies = document.cookie.split(';');
      for(var i = 0; i < cookies.length; i++) {
          var c = cookies[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;
  }, 
        
  getUpdateUrl: function(invitationReceived) {
    var url = VisitCentric.baseUrl + "/updatePageView.html?pageView=" + 
      VisitCentric.pageViewId + "&t=" + new Date().getTime();
      if (invitationReceived) {
      	url += "&invitationReceived=true"
      }
      return url;        
  },
    
	setImage: function(imagePath){
		VisitCentric.liveChatImagePath = imagePath;
	},
	
	setSecureUrl: function(url){
		VisitCentric.secureUrl=url;
	}
        
 };

var LiveChatInvoker = {
	windowWidth: 400,
	windowHeight: 480,
	
	getWindowLeft: function() {
		return (screen.width - LiveChatInvoker.windowWidth) / 2; 
	},
	
	getWindowTop: function() {
		return (screen.height - LiveChatInvoker.windowHeight) / 2;
	},
	
    showRequestForm: function(baseUrl) {
    	var url = baseUrl + '/chatRequestForm.html?visit=' + VisitCentric.getVisit();
    	
    	var parameters = 
    		'width=' + LiveChatInvoker.windowWidth + 
    		',height=' + LiveChatInvoker.windowHeight + 
    		',left=' + LiveChatInvoker.getWindowLeft() + 
    		',top=' + LiveChatInvoker.getWindowTop() + 
    		',status=no,resizable=no,location';
    	
    	window.open(url, '_blank', parameters);
    },
    
    insertChatButton: function (baseUrl, liveChatImagePath) {
    	document.write('<a href="#" id="liveChatLink" onclick="LiveChatInvoker.showRequestForm(\''+baseUrl+'\');return false">');
    	document.write('<img border="0" id="liveChatButton" src="' + baseUrl + '/' + liveChatImagePath + '">');
    	document.write('</a>');
    }        
};


function runner(siteCode, baseUrl, interval) {
    // TODO: move
    CookieUtils.eraseCookie("InviteFormOpened");
        
	if (siteCode != "site_does_not_exist") {
		VisitCentric.addPageView(baseUrl, siteCode, interval);
	}
}


runner('MmmKNV27Xp', 'http://visitcentric.net:80', 30000);