var currentUrl;

function url(page)
{
this.currentUrl = page;

this.setParameter = setParameter;
this.setParameterAccepted = setParameterAccepted;
this.addParameter = addParameter;
this.addParameterAccepted = addParameterAccepted;
this.getParameter = getParameter;
this.removeParameter = removeParameter;
this.setPage = setPage;
this.getUrl = getUrl;
}

function setParameter(key, value) {
   this.setParameterAccepted(key, value, false);
}

function setParameterAccepted(key, value, acceptEmpty) {

    if (!acceptEmpty && (value == null || value.length == 0)) {
      this.removeParameter(key);
      return;
    }
    
    key = encodeURI(key); value = encodeURIComponent(value).replace("\"","\\\"").replace("'","\\'");
    
    this.currentUrl = this.currentUrl.split('#')[0];
    
    var qs = this.currentUrl.split('?');

    if (qs.length <= 1){
      this.currentUrl = this.currentUrl + "?" + key + "=" + value;
      return;
    };
    

    var kvp = qs[1].split('&');
    var i=kvp.length; var x;
    while(i--) {       
     x = kvp[i].split('=');        
     if (x[0]==key) {                
       x[1] = value;                
       kvp[i] = x.join('=');                
       break;        
     }    
    }    
     
    if(i<0) {kvp[kvp.length] = [key,value].join('=');}    
     
    this.currentUrl = qs[0] + "?" + kvp.join('&'); 
}

function addParameter(key, value) {
   this.addParameterAccepted(key, value, false);
}

function addParameterAccepted(key, value, acceptEmpty) {

    if (!acceptEmpty && (value == null || value.length == 0)) {
      this.removeParameter(key);
      return;
    }
    
    key = encodeURI(key); value = encodeURIComponent(value).replace("\"","\\\"").replace("'","\\'");
    
    this.currentUrl = this.currentUrl.split('#')[0];
    
    var qs = this.currentUrl.split('?');

    if (qs.length <= 1){
      this.currentUrl = this.currentUrl + "?" + key + "=" + value;
      return;
    };
    

    var kvp = qs[1].split('&');
    kvp.push(key+'='+value);
     
    this.currentUrl = qs[0] + "?" + kvp.join('&'); 
}

function getParameter(key){  
 
 var regexS = "[\\?&]"+key+"=([^&#]*)";  
 var regex = new RegExp( regexS );  
 
 var results = regex.exec( this.currentUrl );  
 if(results == null) 
      return "";  
 else    
      return decodeURI(results[1]);
}

function removeParameter(key){ 
  
 var regex = new RegExp( "&"+key+"=[^&#]*" );  
 this.currentUrl = this.currentUrl.replace(regex, "");
 regex = new RegExp( "\\?"+key+"=[^&#]*[&#]" );
 this.currentUrl = this.currentUrl.replace(regex, "?");
}

function setPage(page){

  var reg = new RegExp("^.*\\?", "i");
  if (this.currentUrl.match(reg)) 
     this.currentUrl = this.currentUrl.replace(reg, page + "?");
  else {
    this.currentUrl = page; 
  }
}

function getUrl(){
 return decodeURI(this.currentUrl);
}

function validateDateFormat(dateString)
{
  if(dateString==null)
    return null;
  if(dateString.length!=10)
    return null;
  var tab = dateString.split("-");
  if(tab==null)
    return null;
  if(tab.length!=3)
    return null;
  
  //validate days
  var days = tab[0];
  if(days==null || days.length!=2 || !isIntValue(days))
    return null;
    
  //validate month
  var months = tab[1];
  if(months==null ||months.length!=2 || !isIntValue(months))
    return null;
  
  //validate year
  var years = tab[2];
  if(years==null ||years.length!=4 || !isIntValue(years))
    return null;
  
  return isValidDate(years, months, days);
}

function isIntValue(value)
{
  while(value.indexOf("0")==0)
  {
    value = value.substring(1,value.length);
  }
  if(!parseInt(value))
    return false;
  return true;
}

//Receives a string dd-MM-yyyy and returns the Date object
function getDate(dateStr)
{
  if (dateStr.length != 10)
    return null;  
  var day = dateStr.substring(0,2);
  var month = dateStr.substring(3,5);
  var year = dateStr.substring(6,10);
  var date = new Date();
	date.setFullYear(year,(month-1),day);
  return date;	   
}

function formatDate(date){
  var day = date.getDate()+"";
  var month = date.getMonth()+1+"";
  var year = date.getFullYear();
  while (day.length < 2) day = "0" + day;
  while (month.length < 2) month = "0" + month;
  return (day + "-" + month + "-" + year);
}

function formatDateParam(date){
  var day = date.getDate()+"";
  var month = date.getMonth()+1+"";
  var year = date.getFullYear();
  while (day.length < 2) day = "0" + day;
  while (month.length < 2) month = "0" + month;
  return (year + month + day);
}