# -*- coding: utf-8 -*-
##############################################################################
#
# Copyright (c) 2010 Nexedi SA and Contributors. All Rights Reserved.
#                    Ɓukasz Nowak <luke@nexedi.com>
#                    Romain Courteaud <romain@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly advised to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
##############################################################################

from AccessControl import ClassSecurityInfo
from AccessControl import Unauthorized
from AccessControl.SecurityManagement import newSecurityManager
from OFS.Traversable import NotFound
from Products.DCWorkflow.DCWorkflow import ValidationFailed
from Products.ERP5Security.ERP5UserManager import SUPER_USER
from Products.ERP5Type.Globals import InitializeClass
from Products.ERP5Type.Tool.BaseTool import BaseTool
from Products.ERP5Type.UnrestrictedMethod import UnrestrictedMethod
from lxml import etree
from slapos.slap.slap import Computer
from slapos.slap.slap import ComputerPartition as SlapComputerPartition
from slapos.slap.slap import SoftwareInstance
from slapos.slap.slap import SoftwareRelease
from zLOG import LOG, INFO
import xml_marshaller

class SoftwareInstanceNotReady(Exception):
  pass

def convertToREST(function):
  """
  Wrap the method to create a log entry for each invocation to the zope logger
  """
  def wrapper(self, *args, **kwd):
    """
    Log the call, and the result of the call
    """
    self._loginAsSuperUser()
    try:
      retval = function(self, *args, **kwd)
    except ValueError, log:
      LOG('SlapTool', INFO, 'Converting ValueError to NotFound, real error:',
          error=True)
      raise NotFound(log)
    except SoftwareInstanceNotReady, log:
      self.REQUEST.response.setStatus(408)
      return self.REQUEST.response
    except ValidationFailed:
      LOG('SlapTool', INFO, 'Converting ValidationFailed to ValidationFailed, real error:',
          error=True)
      raise ValidationFailed

    self.REQUEST.response.setHeader('Content-Type', 'text/xml')
    return '%s' % retval
  wrapper.__doc__ = function.__doc__
  return wrapper

class SlapTool(BaseTool):
  """SlapTool"""

  # TODO:
  #   * catch and convert exceptions to HTTP codes (be restful)

  id = 'portal_slap'
  meta_type = 'ERP5 Slap Tool'
  portal_type = 'Slap Tool'
  security = ClassSecurityInfo()
  allowed_types = ()

  ####################################################
  # Public GET methods
  ####################################################

  security.declarePublic('getComputerInformation')
  def getComputerInformation(self, computer_id):
    """Returns marshalled XML of all needed information for computer

    Includes Software Releases, which may contain Software Instances.

    Reuses slap library for easy marshalling.
    """
    computer_document = self._getComputerDocument(computer_id)
    self.REQUEST.response.setHeader('Content-Type', 'text/xml')
    self._loginAsSuperUser()

    slap_computer = Computer(computer_id)
    slap_computer._software_release_list = \
           self._getSoftwareReleaseValueListForComputer(computer_document)

    slap_computer._computer_partition_list = []
    for computer_partition_document in computer_document.contentValues(
                                          portal_type="Computer Partition"):
      slap_computer._computer_partition_list.append(
        self._convertToSlapPartition(computer_partition_document, computer_id))
      for slave_partition_document in computer_partition_document\
        .contentValues(portal_type='Slave Partition'):
        slap_computer._computer_partition_list.append(
          self._convertToSlapPartition(slave_partition_document, computer_id))
    return xml_marshaller.xml_marshaller.dumps(slap_computer)

  ####################################################
  # Public POST methods
  ####################################################

  security.declarePublic('setComputerPartitionParameterDict')
  def setComputerPartitionConnectionXml(self, computer_id,
                                        computer_partition_id,
                                        connection_xml):
    """
    Set instance parameter informations on the slagrid server
    """
    return self._setComputerPartitionConnectionXml(computer_id,
                                                   computer_partition_id,
                                                   connection_xml)

  security.declarePublic('buildingSoftwareRelease')
  def buildingSoftwareRelease(self, url, computer_id):
    """
    Reports that Software Release is being build
    """
    return self._buildingSoftwareRelease(url, computer_id)

  security.declarePublic('availableSoftwareRelease')
  def availableSoftwareRelease(self, url, computer_id):
    """
    Reports that Software Release is available
    """
    return self._availableSoftwareRelease(url, computer_id)

  security.declarePublic('softwareReleaseError')
  def softwareReleaseError(self, url, computer_id, error_log):
    """
    Add an error for a software Release workflow
    """
    return self._softwareReleaseError(url, computer_id, error_log)

  security.declarePublic('buildingComputerPartition')
  def buildingComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is being build
    """
    return self._buildingComputerPartition(computer_id, computer_partition_id)

  security.declarePublic('availableComputerPartition')
  def availableComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is available
    """
    return self._availableComputerPartition(computer_id, computer_partition_id)

  security.declarePublic('softwareInstanceError')
  def softwareInstanceError(self, computer_id,
                            computer_partition_id, error_log):
    """
    Add an error for the software Instance Workflow
    """
    return self._softwareInstanceError(computer_id, computer_partition_id,
                                       error_log)

  security.declarePublic('startedComputerPartition')
  def startedComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is started
    """
    return self._startedComputerPartition(computer_id, computer_partition_id)

  security.declarePublic('stoppedComputerPartition')
  def stoppedComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is stopped
    """
    return self._stoppedComputerPartition(computer_id, computer_partition_id)

  security.declarePublic('destroyedComputerPartition')
  def destroyedComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is destroyed
    """
    return self._destroyedComputerPartition(computer_id, computer_partition_id)

  security.declarePublic('requestComputerPartition')
  def requestComputerPartition(self, computer_id, computer_partition_id,
      software_release, software_type, partition_reference, 
      shared_xml, partition_parameter_xml, filter_xml):
    """
    Asynchronously requests creation of computer partition for assigned
    parameters

    Returns XML representation of partition with HTTP code 200 OK

    In case if this request is still being processed data contain
    "Computer Partition is being processed" and HTTP code is 408 Request Timeout

    In any other case returns not important data and HTTP code is 403 Forbidden
    """
    return self._requestComputerPartition(computer_id, computer_partition_id,
        software_release, software_type, partition_reference, 
        shared_xml, partition_parameter_xml, filter_xml)

  security.declarePublic('useComputer')
  def useComputer(self, computer_id, use_string):
    """Entry point to reporting usage of a computer."""
    computer_document = self._getComputerDocument(computer_id)
    # easy way to start to store usage messages sent by client in related Web
    # Page text_content...
    self._reportComputerUsage(computer_document, use_string)
    return 'Content properly posted.'

  security.declarePublic('loadComputerConfigurationFromXML')
  def loadComputerConfigurationFromXML(self, xml):
    "Load the given xml as configuration for the computer object"
    self._loginAsSuperUser()
    computer_dict = xml_marshaller.xml_marshaller.loads(xml)
    computer = self._getComputerDocument(computer_dict['reference'])
    computer.Computer_loadComputerPartitionsFromDictionnary(computer_dict)
    return 'Content properly posted.'

  security.declarePublic('useComputerPartition')
  def useComputerPartition(self, computer_id, computer_partition_id, use_string):
    """Warning : deprecated method."""
    computer_document = self._getComputerDocument(computer_id)
    computer_partition_document = self._getComputerPartitionDocument(
      computer_document.getReference(), computer_partition_id)
    # easy way to start to store usage messages sent by client in related Web
    # Page text_content...
    self._reportUsage(computer_partition_document, use_string)
    return """Content properly posted.
              WARNING : this method is deprecated. Please use useComputer."""

  security.declarePublic('registerComputerPartition')
  def registerComputerPartition(self, computer_reference,
                                computer_partition_reference):
    """
    Registers connected representation of computer partition and
    returns Computer Partition class object
    """
    # Try to get the computer partition to raise an exception if it doesn't
    # exist
    self._getComputerPartitionDocument(
          computer_reference, computer_partition_reference)
    return xml_marshaller.xml_marshaller.dumps(
        SlapComputerPartition(computer_reference,
        computer_partition_reference))

  ####################################################
  # Internal methods
  ####################################################

  def _instanceXmlToDict(self, xml):
    result_dict = {}
    if xml is not None and xml != '':
      tree = etree.fromstring(xml.encode('utf-8'))
      for element in tree.iter(tag=etree.Element):
        if element.tag == 'parameter':
          key = element.get('id')
          value = result_dict.get(key, None)
          if value is not None:
            value = value + ' ' + element.text
          else:
            value = element.text
          result_dict[key] = value
    return result_dict

  def _getModificationStatusForSlave(self, computer_partition_document):
    for slave in computer_partition_document.contentValues(
      portal_type='Slave Partition'):
      if slave.getSlapState() == 'busy':
        slap_partition = self._getSlapPartitionByPackingList(slave)
        if slap_partition._need_modification == 1:
          return 1
    return 0

  def _getSlapPartitionByPackingList(self, computer_partition_document):
    computer = computer_partition_document
    portal = self.getPortalObject()
    portal_preferences = portal.portal_preferences
    while computer.getPortalType() != 'Computer':
      computer = computer.getParentValue()
    computer_id = computer.getReference()
    slap_partition = SlapComputerPartition(computer_id,
                                computer_partition_document.getReference())

    slap_partition._software_release_document = None
    slap_partition._requested_state = 'destroyed'
    slap_partition._need_modification = 0

    movement = self._getSalePackingListLineForComputerPartition(
                                           computer_partition_document)
    if movement is not None:
      software_release_document = \
              movement.getAggregateValue(portal_type='Software Release')
      slap_partition._software_release_document =  SoftwareRelease(
            software_release=software_release_document.getUrlString(),
            computer_guid=computer_id)

      parameter_dict = self._getSalePackingListLineAsSoftwareInstance(
                                                       movement)

      # software instance has to define an xml parameter
      slap_partition._parameter_dict = self._instanceXmlToDict(
        parameter_dict.pop('xml'))
      slap_partition._connection_dict = self._instanceXmlToDict(
        parameter_dict.pop('connection_xml'))
      slap_partition._parameter_dict.update(parameter_dict)

      # Apply state and buildout run conditions
      if movement.getResource() == \
              portal_preferences.getPreferredInstanceSetupResource():

        if movement.getSimulationState() in ('confirmed', 'started',):
          slap_partition._requested_state = 'stopped'
          slap_partition._need_modification = 1
        elif movement.getSimulationState() == 'stopped':
          slap_partition._requested_state = 'stopped'
        elif movement.getSimulationState() == 'delivered':
          pass
        else:
          raise NotImplementedError, "Unexpected state %s" % \
                                     movement.getSimulationState()

      elif movement.getResource() == \
              portal_preferences.getPreferredInstanceHostingResource():

        if movement.getSimulationState() == 'confirmed':
          slap_partition._requested_state = 'started'
          slap_partition._need_modification = 1
        elif movement.getSimulationState() == 'started':
          slap_partition._requested_state = 'started'
        elif movement.getSimulationState() == 'stopped':
          slap_partition._requested_state = 'stopped'
          slap_partition._need_modification = 1
        elif movement.getSimulationState() == 'delivered':
          slap_partition._requested_state = 'stopped'
        else:
          raise NotImplementedError, "Unexpected state %s" % \
                                     movement.getSimulationState()

      elif movement.getResource() == \
              portal_preferences.getPreferredInstanceCleanupResource():

        if movement.getSimulationState() in ('confirmed', 'started', 'stopped'):
          slap_partition._need_modification = 1

      else:
        raise NotImplementedError, "Unexpected resource%s" % \
                                   movement.getResource()
    return slap_partition

  def _convertToSlapPartition(self, computer_partition_document, computer_id):

    slap_partition = self._getSlapPartitionByPackingList(
      computer_partition_document)
    if computer_partition_document.getPortalType() == 'Slave Partition':
      slap_partition._need_modification = 0
    elif computer_partition_document.getQuantity() > 0 and \
        slap_partition._need_modification == 0:
      slap_partition._need_modification = self._getModificationStatusForSlave(
        computer_partition_document)
    return slap_partition

  @convertToREST
  def _buildingSoftwareRelease(self, url, computer_id):
    """
    Reports that Software Release is being build
    """
    computer_document = self._getComputerDocument(computer_id)
    computer_document.startSoftwareReleaseInstallation(software_release_url=url)

  @convertToREST
  def _availableSoftwareRelease(self, url, computer_id):
    """
    Reports that Software Release is available
    """
    computer_document = self._getComputerDocument(computer_id)
    computer_document.stopSoftwareReleaseInstallation(software_release_url=url)

  @convertToREST
  def _softwareReleaseError(self, url, computer_id, error_log):
    """
    Add an error for a software Release workflow
    """
    computer_document = self._getComputerDocument(computer_id)
    computer_document.reportSoftwareReleaseInstallationError(
                                     comment=error_log,
                                     software_release_url=url)

  @convertToREST
  def _buildingComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is being build
    """
    return self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id).startComputerPartitionInstallation()

  @convertToREST
  def _availableComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is available
    """
    return self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id).stopComputerPartitionInstallation()

  @convertToREST
  def _softwareInstanceError(self, computer_id,
                            computer_partition_id, error_log):
    """
    Add an error for the software Instance Workflow
    """
    return self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id).reportComputerPartitionError(
                                     comment=error_log)

  @convertToREST
  def _startedComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is started
    """
    return self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id).startComputerPartition()

  @convertToREST
  def _stoppedComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is stopped
    """
    return self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id).stopComputerPartition()

  @convertToREST
  def _destroyedComputerPartition(self, computer_id, computer_partition_id):
    """
    Reports that Computer Partition is destroyed
    """
    software_instance = self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id)
    return software_instance.destroyComputerPartition()

  @convertToREST
  def _setComputerPartitionConnectionXml(self, computer_id,
                                         computer_partition_id,
                                         connection_xml):
    """
    Sets Computer Partition connection Xml
    """
    software_instance = self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id)
    partition_parameter_kw = xml_marshaller.xml_marshaller.loads(
                                              connection_xml)
    instance = etree.Element('instance')
    for parameter_id, parameter_value in partition_parameter_kw.iteritems():
      # cast everything to string
      parameter_value = str(parameter_value)
      etree.SubElement(instance, "parameter",
                       attrib={'id':parameter_id}).text = parameter_value
    connection_xml = etree.tostring(instance, pretty_print=True,
                                  xml_declaration=True, encoding='utf-8')
    software_instance.edit(
      connection_xml=connection_xml,
    )

  @convertToREST
  def _requestComputerPartition(self, computer_id, computer_partition_id,
        software_release, software_type, partition_reference, 
        shared_xml, partition_parameter_xml, filter_xml):
    """
    Asynchronously requests creation of computer partition for assigned
    parameters

    Returns XML representation of partition with HTTP code 200 OK

    In case if this request is still being processed data contain
    "Computer Partition is being processed" and HTTP code is 408 Request Timeout

    In any other case returns not important data and HTTP code is 403 Forbidden
    """
    shared = xml_marshaller.xml_marshaller.loads(shared_xml)
    partition_parameter_kw = xml_marshaller.xml_marshaller.loads(
                                              partition_parameter_xml)
    filter_kw = xml_marshaller.xml_marshaller.loads(filter_xml)
    instance = etree.Element('instance')
    for parameter_id, parameter_value in partition_parameter_kw.iteritems():
      # cast everything to string
      parameter_value = str(parameter_value)
      etree.SubElement(instance, "parameter",
                       attrib={'id':parameter_id}).text = parameter_value
    instance_xml = etree.tostring(instance, pretty_print=True, 
                                  xml_declaration=True, encoding='utf-8')

    software_instance_document = self._getSoftwareInstanceForComputerPartition(
        computer_id,
        computer_partition_id)
    software_instance_document.requestSoftwareInstance(
            software_release=software_release,
            software_type=software_type,
            partition_reference=partition_reference,
            shared=shared,
            instance_xml=instance_xml,
            filter_kw=filter_kw)

    # Get requested software instance
    requested_software_instance = software_instance_document.portal_catalog.\
        getResultValue(
              portal_type="Software Instance",
              reference=partition_reference,
              title=software_type,
              predecessor_related_uid=software_instance_document.getUid(),)

    if requested_software_instance is None:
      raise SoftwareInstanceNotReady
    else:
      movement = self._getSalePackingListLineForComputerPartition(
                                             requested_software_instance)
      software_instance = SoftwareInstance(
        **self._getSalePackingListLineAsSoftwareInstance(
                                      movement))
      return xml_marshaller.xml_marshaller.dumps(software_instance)

  ####################################################
  # Internals methods
  ####################################################

  def _loginAsSuperUser(self):
    """Inovking python scripts requiers any user, UnrestrictedMethod is not enough"""
    # XXX-Luke: Workaround of security issues. As soon as security will be
    # defined there will be no reason to reuse system user.
    newSecurityManager(None, self.getPortalObject().acl_users.getUserById(
      SUPER_USER))

  @UnrestrictedMethod
  def _getDocument(self, **kwargs):
    # No need to get all results if an error is raised when at least 2 objects
    # are found
    l = self.getPortalObject().portal_catalog(limit=2, **kwargs)
    if len(l) != 1:
      raise NotFound, "No document found with parameters: %s" % kwargs
    else:
      return l[0].getObject()

  def _getComputerDocument(self, computer_reference):
    """
    Get the validated computer with this reference.
    """
    return self._getDocument(
        portal_type='Computer',
        # XXX Hardcoded validation state
        validation_state="validated",
        reference=computer_reference)

  def _getComputerPartitionDocument(self, computer_reference,
                                    computer_partition_reference):
    """
    Get the computer partition defined in an available computer
    """
    # Related key might be nice
    computer = self._getComputerDocument(computer_reference)
    try:
      return self._getDocument(portal_type='Computer Partition',
                             reference=computer_partition_reference,
                             parent_uid=computer.getUid())
    except NotFound:
      return self._getDocument(portal_type='Slave Partition',
                             reference=computer_partition_reference,
                             grand_parent_uid=computer.getUid())

  @UnrestrictedMethod
  def _getUsageReportServiceDocument(self):
    self._loginAsSuperUser()
    service_document = self.Base_getUsageReportServiceDocument()
    if service_document is not None:
      return service_document
    raise Unauthorized

  @UnrestrictedMethod
  def _getSoftwareInstanceForComputerPartition(self, computer_id,
      computer_partition_id):
    self._loginAsSuperUser()
    computer_partition_document = self._getComputerPartitionDocument(
      computer_id, computer_partition_id)
    packing_list_line = self._getSalePackingListLineForComputerPartition(
                                                computer_partition_document)
    if packing_list_line is None:
      raise NotFound, "No software instance found for: %s - %s" % (computer_id,
          computer_partition_id)
    else:
      software_instance = packing_list_line.getAggregateValue(
                                              portal_type="Software Instance")
      if software_instance is None:
        raise NotFound, "No software instance found for: %s - %s" % (computer_id,
            computer_partition_id)
      else:
        return software_instance

  @UnrestrictedMethod
  def _getSalePackingListLineAsSoftwareInstance(self, sale_packing_list_line):
    self._loginAsSuperUser()
    merged_dict = sale_packing_list_line.\
      SalePackinListLine_asSoftwareInstnaceComputerPartitionMergedDict()
    if merged_dict is None:
      LOG('SlapTool._getSalePackingListLineAsSoftwareInstance', INFO,
        '%s returned no information' % sale_packing_list_line.getRelativeUrl())
      raise Unauthorized
    return merged_dict

  @UnrestrictedMethod
  def _getSoftwareReleaseValueListForComputer(self, computer_document):
    """Returns list of Software Releases documentsfor computer"""
    portal = self.getPortalObject()
    self._loginAsSuperUser()

    state_list = []
    state_list.extend(portal.getPortalReservedInventoryStateList())
    state_list.extend(portal.getPortalTransitInventoryStateList())

    software_release_list = []
    computer_reference = computer_document.getReference()
    for software_release_url_string in computer_document\
      .Computer_getSoftwareReleaseUrlStringList(state_list):
      software_release_response = SoftwareRelease(
          software_release=software_release_url_string,
          computer_guid=computer_reference)
      software_release_list.append(software_release_response)
    return software_release_list

  @UnrestrictedMethod
  def _getSalePackingListLineForComputerPartition(self,
                                                  computer_partition_document):
    """
    Return latest meaningfull sale packing list related to a computer partition
    document
    """
    portal = self.getPortalObject()
    portal_preferences = portal.portal_preferences
    service_uid_list = []
    self._loginAsSuperUser()
    for service_relative_url in \
      (portal_preferences.getPreferredInstanceSetupResource(),
       portal_preferences.getPreferredInstanceHostingResource(),
       portal_preferences.getPreferredInstanceCleanupResource(),
       ):
      service = portal.restrictedTraverse(service_relative_url)
      service_uid_list.append(service.getUid())

    # Get associated software release
    state_list = []
    state_list.extend(portal.getPortalCurrentInventoryStateList())
    state_list.extend(portal.getPortalReservedInventoryStateList())
    state_list.extend(portal.getPortalTransitInventoryStateList())

    # Use getTrackingList
    catalog_result = portal.portal_catalog(
      portal_type='Sale Packing List Line',
      simulation_state=state_list,
      aggregate_relative_url=computer_partition_document.getRelativeUrl(),
      default_resource_uid=service_uid_list,
      sort_on=(('movement.start_date', 'DESC'),),
      limit=1,
    )
    if len(catalog_result):
      return catalog_result[0].getObject()
    else:
      return None

  @UnrestrictedMethod
  def _reportComputerUsage(self, computer, usage):
    """Stores usage report of a computer."""
    self._loginAsSuperUser()
    usage_report_portal_type = 'Usage Report'
    usage_report_module = \
      self.getPortalObject().getDefaultModule(usage_report_portal_type)
    sale_packing_list_portal_type = 'Sale Packing List'
    sale_packing_list_module = \
      self.getPortalObject().getDefaultModule(sale_packing_list_portal_type)
    sale_packing_list_line_portal_type = 'Sale Packing List Line'

    software_release_portal_type = 'Software Release'
    hosting_subscription_portal_type = 'Hosting Subscription'
    software_instance_portal_type = 'Software Instance'

    # We get the whole computer usage in one time
    # We unmarshall it, then we create a single packing list,
    # each line is a computer partition
    unmarshalled_usage = xml_marshaller.xml_marshaller.loads(usage)

    # Creates the Packing List
    usage_report_sale_packing_list_document = \
      sale_packing_list_module.newContent(
        portal_type = sale_packing_list_portal_type,
      )
    usage_report_sale_packing_list_document.confirm()
    usage_report_sale_packing_list_document.start()

    # Adds a new SPL line for each Computer Partition
    for computer_partition_usage in unmarshalled_usage.computer_partition_usage_list:
      #Get good packing list line for a computer_partition
      computer_partition_document = self.\
                _getComputerPartitionDocument(
                  computer.getReference(),
                  computer_partition_usage.getId()
                )
      instance_setup_sale_packing_line = \
          self._getDocument(
                    portal_type='Sale Packing List Line',
                    simulation_state='stopped',
                    aggregate_relative_url=computer_partition_document\
                      .getRelativeUrl(),
                    resource_relative_url=self.portal_preferences\
                      .getPreferredInstanceSetupResource()
          )

      # Fetching documents
      software_release_document = \
          self.getPortalObject().restrictedTraverse(
              instance_setup_sale_packing_line.getAggregateList(
                  portal_type=software_release_portal_type
              )[0]
          )
      hosting_subscription_document = \
          self.getPortalObject().restrictedTraverse(
              instance_setup_sale_packing_line.getAggregateList(
                  portal_type=hosting_subscription_portal_type
              )[0]
          )
      software_instance_document = \
          self.getPortalObject().restrictedTraverse(
              instance_setup_sale_packing_line.getAggregateList(
                  portal_type=software_instance_portal_type
              )[0]
          )
      # Creates the usage document
      usage_report_document = usage_report_module.newContent(
        portal_type = usage_report_portal_type,
        text_content = computer_partition_usage.usage,
        causality_value = computer_partition_document
      )
      usage_report_document.validate()
      # Creates the line
      usage_report_sale_packing_list_document.newContent(
        portal_type = sale_packing_list_line_portal_type,
        # We assume that "Usage Report" is an existing service document
        resource_value = self._getUsageReportServiceDocument(),
        aggregate_value_list = [usage_report_document, \
          computer_partition_document, software_release_document, \
          hosting_subscription_document, software_instance_document
        ]
      )

  @UnrestrictedMethod
  def _reportUsage(self, computer_partition, usage):
    """Warning : deprecated method."""
    portal_type = 'Usage Report'
    module = self.getPortalObject().getDefaultModule(portal_type)
    usage_report = module.newContent(
      portal_type=portal_type,
      text_content=usage,
      causality_value=computer_partition
    )
    usage_report.validate()

InitializeClass(SlapTool)