//add a link to toolbox on file pages to purge a specific thumbnail

//check if file namespace (6) - otherwise pointless
var nSpace = mw.config.get('wgNamespaceNumber');
if (nSpace == 6) {

//ensure mediawiki.util loaded
//////////////////////////////
mw.loader.using( 'mediawiki.util', function () {
//call on page load
///////////////////
jQuery( function( $ ) {

//add Thumbnail link to tools
////////////////////////////////// 
var followNode = document.getElementById("t-specialpages").nextSibling;
mw.util.addPortletLink('p-tb', '#thumbnail-purge',
               'Thumbnail purge', 't-thumbnailp', 'Force thumbnail purge','',followNode);

var el = document.getElementById('t-thumbnailp');
el.onclick = purgeThumbp;

function purgeThumbp() {
  function IsNumeric(val) { 
     return Number(val)==val;
  }
  var tsizep = prompt("Thumbnail size to purge?", "800");
  if (IsNumeric(tsizep) && tsizep > 0) {

     //set local server name
     var serverNamep = mw.config.get('wgServer');
     // If the page has no local history
     if (!( $( '#ca-history' )[0] )) {
     //must be commons file, so
     //alert ("commons file");
     serverNamep = "//commons.wikimedia.org";
     }

     var filenamep = wgPageName.substring(wgPageName.indexOf(":") + 1); //removes namespace (File:) prefix
     var purgeurlp = "https:" + serverNamep + "/w/thumb.php?f=" + encodeURIComponent(filenamep) + "&w=" + tsizep;
     //alert (purgeurlp);
     window.open (purgeurlp, "_blank");
  }
}
//close functions
/////////////////
}); //jQuery( function( $ ) {
}); //mw.loader.using( 'mediawiki.util', function () {
}