// this needs the field names correcting for the actual ones being used...

function check_using_regex(strtotest, regexstr) 
{
  var re = new RegExp(regexstr);
  if (strtotest.match(re)) 
  {
    return true;
  } 
  else
  {
    return false;
  }
}


function check_phone(fmphone)
{
  // Check PhoneNO 
  var Phone=document.getElementsByName(fmphone)[0];

  if (Phone)
  {
    var PhoneRegex=/(^((\(?0\d{4}\)?\s?\d{3}\s?\d{3})|(\(?0\d{3}\)?\s?\d{3}\s?\d{4})|(\(?0\d{2}\)?\s?\d{4}\s?\d{4}))(\s?#(\d{4}|\d{3}))?$)/;

    if ( Phone.value == null || Phone.value == "" ) 
    {
      return '';
    }
    if (check_using_regex(Phone.value,PhoneRegex)==false) 
    { 
	return 'The Telephone Number is invalid - must be a UK number with no spaces or international codes.';
    } 
  }
  return '';
}

function check_phone_or_email(fmPhone,fmEmail)
{
  var Phone=document.getElementsByName(fmPhone)[0];
  // Check Email
  var Emailaddr=document.getElementsByName(fmEmail)[0];

  if (Phone && Emailaddr)
  {
	if ((Phone.value == null || Phone.value == "") && (Emailaddr.value == null || Emailaddr.value == ""))
	{
		return 'You must specify either a telephone number or an email address.';
	}
	else
	{
		phone=check_phone(fmPhone);
		email=check_email(fmEmail);
		
		if (email + phone !='')
		{
			if (phone!='')
				return (phone);
			if (email!='')
		  		return (email);
		}
	}
  }
  return '';
}

function check_business(fmBusiness)
{
  // Check Business Name 
  //  var Bname=document.getElementById(fmBusiness);
  var Bname=document.getElementsByName(fmBusiness)[0];
  if (Bname)
  {
    if(Bname.value == "" || Bname.value == null) 
    {
	return 'The Business Name field is incomplete.';
    }
  }
  return '';
}

function check_firstname(fmFname)
{ 
  // Check First Name 
  var Fname=document.getElementsByName(fmFname)[0];
  if (Fname)
  {
    var FnameRegex=/(\d+)/;
    //No numerics
    if( Fname.value == "")
    {
	return 'The First Name field is incomplete.';
    } 
    if (check_using_regex(Fname.value,FnameRegex)==true) 
    {
	return "The First Name field is invalid - it can't contain numbers.";
    }
  }
  return '';
}

function check_surname(fmLname)
{
  // Check Surname 
  var Lname=document.getElementsByName(fmLname)[0];
  if (Lname)
  {
    var LnameRegex=/(\d+)/;
    //No numerics
    if(Lname.value == "") 
    {
	return 'The Surname field is incomplete.';
    }
    if (check_using_regex(Lname.value,LnameRegex)==true)
    {
	return "The Surname field is invalid - it can't contain numbers.";
    }
  }
  return '';
}

function check_email(fmEmail)
{
  // Check Email
  var Emailaddr=document.getElementsByName(fmEmail)[0];
  if (Emailaddr)
  { 
    var EmailRegex=/(^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$)/;

    if ( Emailaddr.value==null || Emailaddr.value=="" ) 
    {
        return '';
    }
    if (check_using_regex(Emailaddr.value,EmailRegex)==false)
    {
	return 'The Email address is invalid.';
    }
  }
  if (email_final_checks(Emailaddr.value)==false)
  {
	return 'The Email address is invalid.';
  }
return '';
}

function email_final_checks(strToCheck)
{
  // Get number of chars that occur after @
  var AtPosition = strToCheck.indexOf("@");
  var Position = strToCheck.length - AtPosition;
  // Check position of @ is at least 5 chars before end of string
  if (Position < 6)
  { 
    return false;
  } 
  // Check for at least 1 stop after @ + 2
  if (strToCheck.indexOf(".", AtPosition + 2) == -1)
  {
    return false;
  } 
  // Check for at least two chars before @
  if (AtPosition < 2)
  { 
    return false;
  } 
  // email format should be OK
  return true;
}

function check_postcode(fmPostCode)
{
  // Check PostCode 
  var Postcode=document.getElementsByName(fmPostCode)[0];
  if (Postcode)
  {
    var PcodeRegex= "^[A-Za-z]{1,2}[0-9]{1,2}[A-Za-z]? ?[0-9]{1}[A-Za-z]{2}$";

    if ( Postcode.value == null || Postcode.value == "" ) 
    {
	return 'The Post Code field is incomplete.';
    }

    if (check_using_regex(Postcode.value, PcodeRegex)==false) 
    {
	return 'The Post Code is invalid - must be a UK one.';
    }
  }
  return '';
}

function check_products(fmProducts)
{
  var Products=document.getElementsByName(fmProducts);
  if (Products)
  {
	if (Products.length==0)
		return '';

	check=false;
	for (counter=0;counter<Products.length;counter++)
	{
		if (Products[counter].checked) 
			check=true;
	}

	if (!check)
	{
 		return 'You must select a product.';
	}
	return '';
  }
  return '';
}
function check_telecoms(fmTelecoms)
{
  var Telecoms=document.getElementsByName(fmTelecoms);
  if (Telecoms)
  {
	if (Telecoms.length==0)
		return '';

	check=false;
	for (counter=0;counter< Telecoms.length;counter++)
	{
		if (Telecoms[counter].checked) 
			check=true;
	}

	if (!check)
	{
		return 'You must select a service.';
	}
	return '';
  }
  return '';
}

function check_product(fmproduct)
{
	var Product = document.getElementsByName(fmproduct)[0];
	if (Product)
	{
		if (Product.value==null || Product.value=="")
		{

			return 'You must select a product.';
		}
	}
	return '';
}

function check_supplier(fmsupplier)
{
	var Supplier = document.getElementsByName(fmsupplier)[0];
	if (Supplier)
	{
		if (Supplier.value==null || Supplier.value=="")
		{			
			return 'You must select a supplier.';
		}
	}
	return '';
}

function check_contract_date(fmdate)
{
	var ContractDate = document.getElementsByName(fmdate)[0];
	if (ContractDate)
	{
		if (ContractDate.value==null || ContractDate.value=="")
		{			
			return 'You must select your contract start date.';
		}
		
	}	
	return '';
}

function check_contract_length(fmcontractlen)
{
	var ContractLen = document.getElementsByName(fmcontractlen)[0];
	if (ContractLen)
	{
		if (ContractLen.value==null || ContractLen.value=="")
		{			
			return 'You must tell us your contract term.';
		}
		
	}
	return '';
}

function check_price(fmprice)
{
	var Price = document.getElementsByName(fmprice)[0];
	if (Price)
	{
		if (Price.value==null || Price.value=="")
		{
			return 'You must provide your price.';			

		}
		if (Price.value<1.0 || Price.value >=20.00)
		{
			return 'The price you have entered is invalid.';
		}
/*
		var isprice = /^\d+\.\d+$/;
		if (check_using_regex(Price.value, isprice)==false) 
		{
			return 'Please enter your price in numbers';
		}
*/
	}
	return  '';
}

function check_address()
{
	var Address1 = document.getElementsByName('psupaddr1')[0];
	if (Address1)
	{

		var Address1 = document.getElementsByName('psupaddr1')[0];
		// address line 2 is allowed to be empty
		var Addresstown = document.getElementsByName('psuptown')[0];
		var Addresscity = document.getElementsByName('psupcity')[0];
		// post code is validated elsewhere		

		if (Address1.value==null || Address1.value=="") 
		{
			return 'You must provide your business address.';
		}
		if (Addresstown.value==null || Addresstown.value=="") 
		{
			return 'You must provide your town/city.';
		}
		if (Addresscity.value==null || Addresscity.value=="") 
		{
			return 'You must provide your county.';
		}
	}
	return  '';
}

function validatePage1()
{
var msg = check_products('products');
if (msg!='')
{
  alert(msg);
  return false;
}
return true;
}

function validatePage2()
{
var msg = '';
var e= check_business('pcompname');
if (e!='') msg = msg + e + '\n';
e=check_firstname('pfirstname');
if (e!='') msg = msg + e + '\n';
e=check_surname('psurname');
if (e!='') msg = msg + e + '\n';
if (msg!='')
{
  alert(msg);
  return false;
}
return true;
}

function validatePage3()
{
var msg = check_phone_or_email('pphoneno','pemail');
if (msg!='')
{
alert(msg);
return false;
}
return true;
}

function validatePriceChecker()
{
var msg='';
var e = check_product('product');
if (e!='') msg = msg + e + '\n';
e= check_contract_date('pcontractdate');
if (e!='') msg = msg + e + '\n';
e= check_contract_length ('pcontractlength');
if (e!='') msg = msg + e + '\n';
e= check_price('pprice');
if (e!='') msg = msg + e + '\n';
e= check_postcode('ppostcode');
if (e!='') msg = msg + e + '\n';

if (msg!='')
{
  alert(msg);
  return false;
}
return true;
}

function check_mprn(fmmprn)
{
  var Mprn=document.getElementsByName(fmmprn)[0];

  if (Mprn)
  {
   if (Mprn.value == null || Mprn.value == "" )
   {
	return 'The MPRN number is incomplete.';
   }

//    var MprnRegex=/(^((\(?0\d{4}\)?\s?\d{3}\s?\d{3})|(\(?0\d{3}\)?\s?\d{3}\s?\d{4})|(\(?0\d{2}\)?\s?\d{4}\s?\d{4}))(\s?#(\d{4}|\d{3}))?$)/;
    var MprnRegex=/^(\d{6,10}$)/;
    if (check_using_regex(Mprn.value, MprnRegex)==false) 
    { 
	return 'The MPRN number is invalid - it must be between 6 and 10 numbers.';
    }
  }
  return '';
}

function check_MPAN()
{ 
  var Mpan_distid=document.getElementsByName('pMpanDistID')[0];
  if (Mpan_distid)
  {
	// first field exists so the rest should be present
	var Mpan_urn1=document.getElementsByName('pMpanUrn1')[0];
	var Mpan_urn2=document.getElementsByName('pMpanUrn2')[0];
	var Mpan_cd=document.getElementsByName('pMpanCD')[0];

	var mpan = Mpan_distid.options[Mpan_distid.selectedIndex].text + Mpan_urn1.value + Mpan_urn2.value + Mpan_cd.value;

	var Mpan_Profile=document.getElementsByName('pMpanProfile')[0];
	var Mpan_Mts=document.getElementsByName('pMpanMTS')[0];
	var Mpan_LL=document.getElementsByName('pMpanLL')[0];

	var fullmpan =  Mpan_Profile.options[Mpan_Profile.selectedIndex].text + Mpan_Mts.value + Mpan_LL.value+mpan;

	if (fullmpan.length != 21)
	{	  
	   return 'The MPAN value is incomplete.';
	}
	var primes = [ 3, 5, 7, 13, 17, 19, 23, 29, 31, 37, 41, 43 ];
	var sum=0;
	var value=0;

	for (i = 0; i < primes.length; i++)
        {
           sum = sum + (mpan.charAt(i) * primes[i]);
        }

	value = sum % 11;
	value = value % 10;

	if (value != mpan.charAt(12))
	{		
		return 'The MPAN value is invalid.';
	}
	return '';
  }
 return '';
}

function checkMPANorMPRN(fmproduct, fmMPRN)
{
// if product is electricity check if mpan is complete else check mprn
	var Product = document.getElementsByName(fmproduct)[0];
	if (Product)
	{
		// we should have already checked for a value in product
		if (Product.value=='electricity')
		{			
			return check_MPAN();
		}
		if (Product.value=='gas')
		{
			return check_mprn(fmMPRN);				
		}
	}
	return '';
}

function validatewindowchecker()
{
var result = true;
var msg = '';
var e = check_products('products');
if (e!='') msg = msg + e + '\n';

e = check_product('product');
if (e!='') msg = msg + e + '\n';

e=check_supplier('pCurSup');
if (e!='') msg = msg + e + '\n';

if (msg!='') 
{
  alert(msg);
  result = false;
}
return result;
}

function validateform()
{
var result = true;
var msg = '';
var e = check_products('products');
if (e!='') msg = msg + e + '\n';

e = check_product('product');
if (e!='') msg = msg + e + '\n';

e= check_telecoms('telecoms');
if (e!='') msg = msg + e + '\n';

e=check_supplier('pcursup');
if (e!='') msg = msg + e + '\n';

e=checkMPANorMPRN('product','pMprNo');
if (e!='') msg = msg + e + '\n';

e=check_firstname('pfirstname');
if (e!='') msg = msg + e + '\n';

e=check_surname('psurname');
if (e!='') msg = msg + e + '\n';

e=check_business('pcompname');
if (e!='') msg = msg + e + '\n';

e=check_address();
if (e!='') msg = msg + e + '\n';

e=check_phone_or_email('pphoneno','pemail');
if (e!='') msg = msg + e + '\n';

e=check_postcode('psuppostcode');
if (e!='') msg = msg + e + '\n';

if (msg!='') 
{
  alert(msg);
  result = false;
}
return result;
}