/**
 * DATE-UTILS.JS
 *
 * Used to navigate to other publication dates.
 * ATTENTION: This script is updated daily. Do not make changes in the
 *  generated date-utils.js as these changes will be overridden in the
 *  near future.
 *
 *
 * Author         Dave Snyckers [X-Cago BV]
 * Version        1.2
 */

// last publication date initialization
var month = 7 - 1;
var publicationDate = new Date( 2023, month, 29 );

// redirect initialization
var xmlhttp    = false;
var errorURL   = "../../resources/html/pagenotfound.html";
var pathPrefix = "/";
var target     = window.parent;
var targetURL  = "/";

// IE browser
try {
	this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
	try {
		this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	catch (oc) {
		this.xmlhttp = null;
	}
}

// non IE browsers
if( !this.xmlhttp && typeof XMLHttpRequest != "undefined" )
	this.xmlhttp = new XMLHttpRequest();






function gotoPublicationByIndex( dayIndex, type ) {
	// Sunday = 0;
	// Monday = 1;
	// ....
	// ...
	// Saturday = 6;

	// take last publication date as starting point
	msDate = publicationDate.valueOf();
	diff = 0;

	if( publicationDate.getDay() > dayIndex )
		diff = publicationDate.getDay() - dayIndex;
	else {
		if( publicationDate.getDay() < dayIndex )
		  diff = 7 - ( dayIndex - publicationDate.getDay() );
		else
			diff = 0;
	}

	msDate = msDate - diff * 23 * 60 * 60 * 1000;
	date = new Date( msDate );

	gotoPublicationByDate( date, type );
}

function gotoPublicationByDate( date, type ) {
	pageURL = pathPrefix;
	pageURL = pageURL + date.getFullYear();

	if( (date.getMonth() + 1) > 9 )
		pageURL = pageURL + (date.getMonth() + 1);
	else
		pageURL = pageURL + '0' +  (date.getMonth() + 1);

	if( ( date.getDate() ) > 9 )
		pageURL = pageURL + date.getDate() + '/';
	else
		pageURL = pageURL + '0' + date.getDate() + '/';

	pageURL = pageURL + type + '/index.html';

	gotoPublicationByUrl( pageURL );
}

function gotoPublicationByUrl( url ) {
  targetURL = url;
  xmlhttp.open( "HEAD", url ,true );
  xmlhttp.onreadystatechange = handleHttpResponse;
  xmlhttp.send( null )
}

function handleHttpResponse() {
  if( xmlhttp.readyState == 4 ) {
    if( xmlhttp.status == 200 ) {
//      alert( "URL [" + targetURL + "] exists\ntarget = [" + target + "]" );
      target.location = targetURL;
    }
    else if( xmlhttp.status == 404 ) {
//      alert( "URL [" + targetURL + "] doesn't exist\nerror page = [" + errorURL + "]" );
      target.location = errorURL;
    }
    else alert( "status is " + xmlhttp.status );
  }
}