Dump deleted messages

function save_deleted_messages(as_json){
   if (as_json){
      vkopt.save_file(JSON.stringify(vk_deleted_messages,'', '   '), 'deleted_messages'+vk.id+' '+(new Date())+'.json');
   } else {
      vkopt.messages.export_data(vk_deleted_messages);
   }
}
function search_deleted_messages(){
   var get_last_msg_id = function(cb){
      dApi.call('messages.getDialogs', {count:1, v:'5.73'}, function(r){
         cb(((((r.response || {}).items || [])[0] || {}).message || {}).id)
      })
   }
   window.vk_deleted_messages = [];
   var msg = window.vk_deleted_messages;
   var del_ids = [];
   var restored = 0;
   var restoring = false;
   var last_msg = 0;
   var offset = 0;

   var collect = function(cb){
      var ids = [];
      var PER_REQ = 50;
      var PER_EXEC = 10;
      for (var i = 0; (i < PER_REQ * PER_EXEC) && (offset > 0); i++)
         ids.push(offset--);

      var code = [];
      while(ids.length)
         code.push('API.messages.getById({"message_ids":"'+ids.splice(0,PER_REQ).join(',')+'"}).items');
      code = 'return ' + code.join('+') + ';'

      dApi.call('execute', {code: code, v:'5.73'}, function(r){
         if (r && r.response){
            r.response.forEach(function(item, idx){
               if (item.deleted){
                  msg.push(item);
                  del_ids.push(item.id);
               }
            })

            ge('vk_scan_msg').innerHTML =
                                    (offset > 0 ?  vkProgressBar(last_msg - offset, last_msg, 310, IDL('msgreq') + ' %')+'<br><br>' : '')+
                                    'deleted found: <b>' + msg.length + '</b><br>'+
                                    (msg.length > 0 ?
                                    '<div class="button_blue"><button onclick="save_deleted_messages()">save '+msg.length+' messages (.html)</button></div><br>'+
                                    '<div class="button_gray"><button onclick="save_deleted_messages(true)">save '+msg.length+' raw messages (.json)</button></div><br/>' : '')+
                                    (offset > 0 ? 'cur msg id:' + offset : '');

            if (!restoring){
               ge('vk_restore_msg').innerHTML = restored > 0 ? 'Restored: <b>' + restored + '</b>' : '';
               var r_btn = se('<div class="button_blue"><button>try restore '+del_ids.length+' messages</button></div>');
               ge('vk_restore_msg').appendChild(r_btn);
               addEvent(r_btn, 'click', function(ev){
                  restore();
               });
            }

            if (offset > 0){
               //console.log('ESTIMATED IDs: ', offset);
               setTimeout(function(){collect(cb)},300);
            } else {
               cb();
            }
         } else {
            console.log('API EXEC FAILED: ', code);
         }

      })
   }
   var restore = function(){
      if (!del_ids.length){
         alert('Nothing to restore');
         return;
      }
      ge('vk_restore_msg').innerHTML = 'Preparing to restore...';
      restoring = true;
      var total = del_ids.length;
      var code = [];
      for (var i = 0; i < 15 && del_ids.length; i++)
         code.push('API.messages.restore({message_id:'+del_ids.shift()+'})');
      code = 'return [ ' + code.join(',') + ' ];'

      dApi.call('execute', {code: code, v:'5.73'}, function(r){
          if (r && r.response){
             restored += r.response.filter(function(item){return item}).length;
             ge('vk_restore_msg').innerHTML = vkProgressBar(total - del_ids.length, total, 310, 'Restoring... %') + '<br><br>' +
                                               'Restored: <b>' + restored + '</b>';
          } else {
             console.log('API EXEC RESTORE FAILED: ', code);
          }
          if (del_ids.length){
             restore();
          } else {
             restoring = false;
             ge('vk_restore_msg').innerHTML = 'Restored: <b>' + restored + '</b>';
          }

      })
   }


   var box = new MessageBox({
         title : IDL('ScanMessages'),
         closeButton : true,
         width : "350px"
      });
   box.removeButtons();
   box.addButton(IDL('Cancel'), function (r) {
      abort = true;
      box.hide();
   }, 'no');
   var html = '<div id="vk_scan_msg">Starting process...</div><div id="vk_restore_msg"></div>';
   box.content(html).show();

   get_last_msg_id(function(id){
      if (!id){
         alert('Nothing...');
         return;
      }
      last_msg = id;
      offset = id;
      collect(function(){
         alert('done');
      })
   });
}
search_deleted_messages();