var workspaceNames = session.getWorkspace().getAccessibleWorkspaceNames();
  var sessions = {};
  for (var i = 0; i < workspaceNames.length; i++)
  {
    	var workspaceName = workspaceNames[i];
  
       sessions[workspaceName] = repository.login(workspaceName);   
  };
  
  
  
  
  var vhs = [];

  var q = session.getWorkspace().getQueryManager().createQuery("//element(*, nt:versionHistory)", javax.jcr.query.Query.XPATH);
  var nodes = q.execute().getNodes();
  
  var count = nodes.getSize();
  
  while (nodes.hasNext())
  {
        var vh = nodes.next();
		var id = vh.getVersionableIdentifier();

    	var foundOne = false;
        for (var i = 0; i < workspaceNames.length; i++)
        {
              var workspaceName = workspaceNames[i];

              try
              {
                  sessions[workspaceName].getNodeByUUID(id);
                  foundOne = true;
                  break;
              }
              catch (e)
              {
                  // nothing
              }
        };
  
  		if (!foundOne)
        {
          	vhs.push(vh);
        }
  };

print("Going to remove " + vhs.length + " history nodes on " + count + " existing nodes")
print("-------------------------------------------------------")
  
var errors = 0;
var done = 0;
var empty = 0;
var fixed = 0;

for (var i = 0; i < vhs.length; i++)
{
	var vh = vhs[i];
		
	var it = vh.getAllVersions();

	var hasError = false;
	var childNodesSize = 0;
	
	while (it.hasNext())
	{
		var version = it.next();
		if (version.getName() != "jcr:rootVersion")
		{
			childNodesSize++;

			try
			{
				vh.removeVersion(version.getName());
			}
			catch (e)
			{
				hasError = true;
				print("Error with version " + version.getName() + " of " + vh.getUUID() + "... " + e);
			}
		}
	}
	
	if (childNodesSize == 0)
	{
		_removeEmptyHistory(vh);
		try
		{
			session.getNodeByUUID(vh.getUUID());
			
			print("Empty history node is " + vh.getUUID())
			empty++;			
		}
		catch (e)
		{
			fixed++;
		}
	}
	else if (hasError)
	{
		errors++;
	}
	else
	{
		done++;
	}
}

print("-------------------------------------------------------")
print(done + " normal history nodes removed");
print(fixed + " empty history nodes fixed and removed");
print(empty + " empty history nodes that are unfixable");
print(errors + " unconsistents history nodes that cannot be removed");

function _removeEmptyHistory(vh)
{
	var node = session.getNode("/ametys:root").addNodeWithUuid("historyrepair", "nt:unstructured", vh.getProperty("jcr:versionableUuid").getString());
	node.addMixin("mix:versionable");
	session.save();
	node.checkin();
	node.checkout();	
	session.removeItem("/ametys:root/historyrepair");
	session.save();
	vh.removeVersion("1.0");
}