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(function(window, $, undef) {
  "use strict";
  var document = window.document;
  var storage = window.localStorage, JSON = window.JSON;
  var keyPrefix = 'ClientsideDrafts::drafts';
  var mediaWiki = window.mediaWiki;
  var textareaSelector = '#wpTextbox1';
  
  // function showMessage(messaggio) {
  var showMessage = function(messaggio) {
    if (mediaWiki.util && mediaWiki.util.jsMessage) {
      mediaWiki.util.jsMessage(messaggio); // MediaWiki 1.18
    } else if (window.jsMsg) {
      window.jsMsg(messaggio);
    }
  };

  // function t() {
  var t = function() { 
    var messaggio = mediaWiki.message.apply(mediaWiki, arguments);
    return messaggio.toString();
  };

  if (storage === undef || JSON === undef) {
    showMessage(t('clientsidedrafts-required'));
    return; // No HTML5 storage or JSON support, exiting.
  }

  // State saved as pair { draft }

  (function(title, userName) {
    var key = [keyPrefix, userName || '', title].join('-');
    var $textarea = $(textareaSelector);

    // function loadKey(key) {
    var loadKey = function(key) {
      var s = storage.getItem(key);
      if (s !== null) s = JSON.parse(s);
      return s;
    };

    // function saveKey(key, data) {
    var saveKey = function(key, data) {
      if (!data){
        storage.removeItem(key);
        return;
      }
      if (data !== null) {
        data = JSON.stringify(data);
      }
      storage.setItem(key, data);
    };
  
    // function loadDraft() {
    var loadDraft = function() {
      var state = loadKey(key);
      if ($.isPlainObject(state) && state.draft) {

          $textarea.val(state.draft);
          showMessage('Draft caricata. (<a href="javascript:;" class="clientsidedrafts_skipdraft">annulla</a>)');
      }
    };

    // function saveDraft() {
    var saveDraft = function() {
      var draft = $textarea.val();
      var state = { draft: draft };
      saveKey(key, state);
      showMessage('Draft Saved');
    };

    // function deleteDraft() {
    var deleteDraft = function() {
      saveKey(key, false);
      showMessage("Draft removed");      
    };

    if(mediaWiki.config.values.wgAction=='edit'){
      loadDraft();
    }else{
      showMessage('<a href="javascript:;" class="clientsidedrafts_savedraft">Save Draft</a>');
    }

    // Link "Save Draft" onclick
    $('body').delegate('a.clientsidedrafts_savedraft', 'click', function(e) {
        e.preventDefault();
        saveDraft();
    });

    // Link "Annulla" onclick
    $('body').delegate('a.clientsidedrafts_skipdraft', 'click', function(e) {
      e.preventDefault();
      deleteDraft();
        var x=window.location.href;
        window.location.href=x;
    });

  })(mediaWiki.config.values.wgTitle, mediaWiki.config.values.wgUserName);

})(window, jQuery);