/*
    JavaScript functions to store information about the first visit 
    to a site (referrer and date), and to report that information in
    a hidden form field when needed
*/

var cookieName = 'firstVisit';
var fieldName  = 'tracking';

function grabReferrer() {
// store referrer and date in a cookie

    var cookieData = getCookie();
        
    if( ! cookieData[ cookieName ] ) {
        // ensure that nothing is overwritten if previously stored
        var visitData = window.location + '|' + ( document.referrer ? document.referrer : 'No referrer' ) + '|' + getSSDate();
        setCookie( cookieName, visitData );
    }
}

function reportReferrer() {
// write referrer and date into hidden form field 
    
    var cookieData = getCookie();
    
    if( cookieData[ cookieName ] ) {
        var htm = '<input type="hidden" name="' + fieldName + '" value="' + cookieData[ cookieName ] + '|' + getSSDate() + '" />';
        document.write( htm );
    }
}

function getSSDate() {
// return the current time in sophia date format

    var now = new Date();    
       
    return now.getFullYear() + '-' + 
        ( now.getMonth() + 1 ) + '-' + 
        now.getDate() + ' ' + 
        now.getHours()  + ':' + 
        now.getMinutes() + ':' + 
        now.getSeconds();   
}

function setCookie( n, v ) {
// set a cookie with given name and value

	var today = new Date();
	var expiry = new Date( today.getTime() + 1000 * 60 * 60 * 24 * 365 );
	
	if( n && v ) {
		window.document.cookie = n + '=' + escape( v ) + ';path=/;expires=' + expiry.toGMTString();
	}
}

function getCookie() {
// return an array full of cookie data

    var cookieData = new Array();
    var cookieVals = window.document.cookie.split( ';' );

    for( var n in cookieVals ) {
        var parts = cookieVals[ n ].replace( /^\s*([^\s]*)\s*$/, '$1' );
        parts = parts.split( '=' );
		cookieData[ parts[ 0 ] ] = unescape( parts[ 1 ] );
    }
    return cookieData;
}