# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is Reportek version 1.0.
#
# The Initial Developer of the Original Code is European Environment
# Agency (EEA).  Portions created by Finsiel and Eau de Web are
# Copyright (C) European Environment Agency.  All
# Rights Reserved.
#
# Contributor(s):
# Miruna Badescu, Eau de Web

## RemoteApplication
##

import tempfile
import logging
from Products.ZCatalog.CatalogAwareness import CatalogAware
from OFS.SimpleItem import SimpleItem
from Globals import InitializeClass
from AccessControl import getSecurityManager, ClassSecurityInfo
from Products.PageTemplates.PageTemplateFile import PageTemplateFile
from AccessControl.Permissions import view_management_screens
from DateTime import DateTime
import xmlrpclib
import string
import urllib
from Products.PythonScripts.standard import html_quote


feedback_log = logging.getLogger(__name__ + '.feedback')

FEEDBACKTEXT_LIMIT = 1024 * 16 # 16KB


manage_addRemoteApplicationForm = PageTemplateFile('zpt/remote/application_add', globals())

def manage_addRemoteApplication(self, id='', title='', RemoteServer='', RemoteService='', app_name='', REQUEST=None):
    """ Generic application that calls a remote service 
    """

    ob = RemoteApplication(id, title, RemoteServer, RemoteService, app_name)
    self._setObject(id, ob)

    if REQUEST is not None:
        return self.manage_main(self, REQUEST, update_menu=1)

class RemoteApplication(SimpleItem):
    """ A computerised application, executed by an activity.
        It executes a set of operations on a remote server and generates a feedback object
        into the envelope as result of these.
        The instance data for the RemoteApplication is stored in the workitem
        as an additional property - app_name - contaning a dictionary like::

          {
            'analyze':      {code, retries_left, last_error, next_run}, 
            'getResult':    {jobID: {code, retries_left, last_error, next_run, fileURL}}
          }

        First, a call is made to the 'analyze' function from the remote service which retireves 
        the list of files that will be analyzed along with their jobIDs

        Second, the 'getResult' remote service function is called for every job

        Possible codes for app_name['analyze']:

        -   0 - started
        -   2 - nothing to do
        -   1 - done
        -   -2 - failed

        Possible codes for app_name['getResult'][jobID]:

        -   0 - processing
        -   1 - result succefully brought
        -   -2 - failed
    """

    # Create a SecurityInfo for this class. We will use this
    # in the rest of our class definition to make security
    # assertions.
    security = ClassSecurityInfo()
    meta_type = 'Remote Application'

    manage_options = ( ( {'label' : 'Settings', 'action' : 'manage_settings_html'}, )
                + SimpleItem.manage_options
                )

    def __init__(self, id, title, RemoteServer, RemoteService, app_name, nRetries=5, retryFrequency=300, nTimeBetweenCalls=60):
        """ Initialize a new instance of Document """
        self.id = id
        self.title = title
        self.RemoteServer = RemoteServer
        self.RemoteService = RemoteService
        self.app_name = app_name
        self.nRetries = nRetries                    # integer
        self.retryFrequency = retryFrequency        # integer - seconds
        self.nTimeBetweenCalls = nTimeBetweenCalls  # integer - seconds

    def manage_settings(self, title, RemoteServer, RemoteService, app_name, nRetries, retryFrequency, nTimeBetweenCalls):
        """ Change properties of the QA Application """
        self.title = title
        self.RemoteServer = RemoteServer
        self.RemoteService = RemoteService
        self.nRetries = nRetries
        self.app_name = app_name
        self.retryFrequency = retryFrequency
        self.nTimeBetweenCalls = nTimeBetweenCalls

    security.declareProtected('Use OpenFlow', '__call__')
    def __call__(self, workitem_id, REQUEST=None):
        """ Runs the Remote Aplication for the first time """
        # The workitem taken by aquisition
        l_workitem = getattr(self, workitem_id)
        # delete all automatic feedbacks previously posted by this application
        l_envelope = l_workitem.getMySelf()
        for l_item in l_envelope.objectValues('Report Feedback'):
            if l_item.activity_id == self.app_name:
                l_envelope.manage_delObjects(l_item.id)

        # Initialize the workitem QA specific extra properties
        self.__initializeWorkitem(workitem_id)

        # dictionary of {xml_schema_location: [URL_file]}
        l_dict = self.getDocumentsForRemoteService()

        if not l_dict:
            self.__manageAutomaticProperty(p_workitem_id=workitem_id, p_analyze={'code':2})
            l_workitem.addEvent('Operation completed: no files to analyze')
            if REQUEST is not None:
                REQUEST.set('RemoteApplicationSucceded', 1)
                REQUEST.set('actor', 'openflow_engine')
            self.__finishApplication(workitem_id, REQUEST)
        else:
            l_ret = self.__analyzeDocuments(workitem_id, l_dict)
            if not l_ret:
                l_workitem.addEvent('Operation completed: no files to analyze')
                if REQUEST is not None:
                    REQUEST.set('RemoteApplicationSucceded', 1)
                    REQUEST.set('actor', 'openflow_engine')
                self.__finishApplication(workitem_id, REQUEST)
            # see if it's any point to go on
            elif eval('l_workitem.'  + self.app_name)['analyze']['code'] == -2:
                l_workitem.addEvent('Operation failed: error calling the remote service')
                if REQUEST is not None:
                    REQUEST.set('RemoteApplicationSucceded', 0)
                    REQUEST.set('actor', 'openflow_engine')
                self.__finishApplication(workitem_id, REQUEST)
        return 1

    security.declareProtected('Use OpenFlow', 'callApplication')
    def callApplication(self, workitem_id, REQUEST=None):
        """ Called on regular basis """
        l_workitem = getattr(self, workitem_id)
        # dictionary of {xml_schema_location: [URL_file]}
        l_dict = self.getDocumentsForRemoteService()
        # get the property of the workitem which keeps all the instance data for this operation
        l_wk_prop = eval('l_workitem.' + self.app_name)

        # test if analyze should be called
        if l_wk_prop['analyze']['code'] == 0:
            self.__analyzeDocuments(workitem_id, l_dict)
        # see if it's any point to go on
        elif l_wk_prop['analyze']['code'] == -2:
            if REQUEST is not None:
                REQUEST.set('RemoteApplicationSucceded', 0)
                REQUEST.set('actor', 'openflow_engine')
            self.__finishApplication(workitem_id, REQUEST)
            return 1

        # test if getResult should be called
        l_files_success = {}
        l_files_failed = {}
        for l_jobID, l_job_details in l_wk_prop['getResult'].items():
            if l_job_details['code'] == 0 and l_job_details['next_run'].lessThanEqualTo(DateTime()):
                l_ret_step2 = self.__getResult4XQueryServiceJob(workitem_id, l_jobID)
                l_fn = l_job_details['fileURL'].split('/')[-1]
                if l_ret_step2[l_jobID]['code'] == 1:
                    if l_files_success.has_key(l_fn): l_files_success[l_fn] += ', #%s' % l_jobID
                    else: l_files_success[l_fn] = '#%s' % l_jobID
                else:
                    if l_files_failed.has_key(l_fn): l_files_failed[l_fn] += ', #%s' % l_jobID
                    else: l_files_failed[l_fn] = '#%s' % l_jobID
        # write to log the list of file that succeded
        if l_files_success:
            l_filenames_jobs = ''
            for x in l_files_success.keys():
                l_filenames_jobs += '<li>%s for file %s</li>' % (l_files_success[x], x)
            l_workitem.addEvent('%s job(s) completed: <ul>%s</ul>' % (self.app_name, l_filenames_jobs))
        # Check if the application has done its job
        l_complete = 1
        l_failed = 0
        for l_jobID, l_job_details in l_wk_prop['getResult'].items():
            # result retrieved
            if l_job_details['code'] == 1:
                pass
            # error of some kind
            elif l_job_details['code'] == -2:
                l_failed = 1
            # needs to run again, do not complete
            else:
                l_complete = 0
        if l_complete:
            # write to log the list of file that failed
            if l_files_failed:
                l_filenames_jobs = ''
                for x in l_files_failed.keys():
                    l_filenames_jobs += '<li>%s for file %s</li>' % (l_files_failed[x], x)
                l_workitem.addEvent('Giving up on %s job(s): <ul>%s</ul>' % (self.app_name, l_filenames_jobs))
            if REQUEST is not None:
                REQUEST.set('RemoteApplicationSucceded', 1 - l_failed)
                REQUEST.set('actor', 'openflow_engine')
            self.__finishApplication(workitem_id, REQUEST)
        return 1

    ##############################################
    #   XQuery calls
    ##############################################

    def __analyzeDocuments(self, p_workitem_id, p_files_dict):
        """ Makes an XML/RPC call to the 'analyzeXMLFiles' function from the XQuery service 
        """
        l_workitem = getattr(self, p_workitem_id)
        # get the property of the workitem which keeps all the instance data for this operation
        l_wk_prop = eval('l_workitem.' + self.app_name)

        try:
            l_server = xmlrpclib.ServerProxy(self.RemoteServer)
            l_ret = eval('l_server.' + self.RemoteService + '.analyzeXMLFiles(p_files_dict)')
            # if there were no files to assess, return 0 so the work can go on
            if not l_ret:
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_analyze={'code':2})
                return 0
            # How much to wait before making next XML/RPC call in days
            l_tmp = float(self.nTimeBetweenCalls) / (60 * 60 * 24)
            # Operation succedded, the XQuery service got the call and it returned [(jobID, fileURL)]
            l_getResult = {}
            l_files = {}
            for l_job, l_file in l_ret:
                l_getResult[str(l_job)] = {'code':0, 'retries_left':self.nRetries, 'last_error':None, 'next_run':DateTime(), 'fileURL':l_file}
                l_filename = l_file.split('/')[-1]
                if l_files.has_key(l_filename):
                    l_files[l_filename] += ', #' + str(l_job)
                else:
                    l_files[l_filename] = '#' + str(l_job)
            self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_analyze={'code':1}, p_getResult=l_getResult)
            # Write in the envelope's log which files were sent to be analyzed and their QA jobs
            l_filenames_jobs = ''
            for x in l_files.keys():
                l_filenames_jobs += '<li>%s for file %s</li>' % (l_files[x], x)
            l_workitem.addEvent('%s job(s) in progress: <ul>%s</ul>' % (self.app_name, l_filenames_jobs))

        # An XML-RPC fault package - retry later
        # The agreed errors from the XQuery service are embedded in this error type
        except xmlrpclib.Fault, l_fault:
            l_nRetries = int(l_wk_prop['analyze']['retries_left'])
            if l_nRetries == 0:
                l_workitem.addEvent('Error in sending files to %s: %s' % (self.app_name, str(l_fault.faultString)))
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                        p_analyze={'code':-2, 'last_error':'Code: ' + str(l_fault.faultCode) + '\nDescription: ' + str(l_fault.faultString)})
            else:
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                        p_analyze={'code':0, 'last_error':'Code: ' + str(l_fault.faultCode) + '\nDescription: ' + str(l_fault.faultString), 'retries_left':l_nRetries - 1, 'next_run':l_wk_prop['analyze']['next_run'] + self.retryFrequency})
        # An HTTP protocol error - retry later
        except xmlrpclib.ProtocolError, l_protocol:
            l_nRetries = int(l_wk_prop['analyze']['retries_left'])
            if l_nRetries == 0:
                l_workitem.addEvent('Error in sending files to %s: %s' % (self.app_name, str(l_protocol.errmsg)))
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                        p_analyze={'code':-2, 'last_error':'Code: ' + str(l_protocol.errcode) + '\nDescription: ' + str(l_protocol.errmsg)})
            else:
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                        p_analyze={'code':0, 'last_error':'Code: ' + str(l_protocol.errcode) + '\nDescription: ' + str(l_protocol.errmsg), 'retries_left':l_nRetries - 1, 'next_run':l_wk_prop['analyze']['next_run'] + self.retryFrequency})
        # A broken response package - critical, do not retry
        except xmlrpclib.ResponseError, l_response:
            l_workitem.addEvent('Error in sending files to %s: %s' % (self.app_name, str(l_response)))
            self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                     p_analyze={'code':-2, 'last_error':'Response error\nDescription: ' + str(l_response)})
        # Generic client error - critical, do not retry
        except xmlrpclib.Error, err:
            l_workitem.addEvent('Error in sending files to %s: %s' % (self.app_name, str(err)))
            self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                     p_analyze={'code':-2, 'last_error':str(err)})
        except Exception, err:
            l_workitem.addEvent('Error in sending files to %s: %s' % (self.app_name, str(err)))
            self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, 
                     p_analyze={'code':-2, 'last_error':str(err)})
        return 1

    def __getResult4XQueryServiceJob(self, p_workitem_id, p_jobID):
        """ Makes an XML/RPC call to the 'getResult' function from the remote service 
            for an existing job
        """
        l_workitem = getattr(self, p_workitem_id)
        # get the property of the workitem which keeps all the instance data for this operation
        l_wk_prop = eval('l_workitem.' + self.app_name)
        # find out what file this job was for
        l_file_url = l_wk_prop['getResult'][p_jobID]['fileURL']
        l_file_id = urllib.unquote(string.split(l_file_url, '/')[-1])

        try:
            l_server = xmlrpclib.ServerProxy(self.RemoteServer)
            l_ret = eval('l_server.' + self.RemoteService + '.getResult(str(p_jobID))')

            # job ready
            if l_ret['CODE'] == '0':
                if l_file_id == 'xml':
                    l_filename = ' result for: '
                else:
                    l_filename = ' result for file %s: ' % l_file_id
                envelope = self.aq_parent
                feedback_id = self.app_name + '_' + str(p_jobID) + '_' + str(int(DateTime()))
                envelope.manage_addFeedback(id=feedback_id, 
                        title= self.app_name + l_filename + l_ret['SCRIPT_TITLE'], 
                        activity_id=l_workitem.activity_id,
                        automatic=1, 
                        document_id=l_file_id)
                feedback_ob = envelope[feedback_id]

                content = l_ret['VALUE']
                content_type = l_ret['METATYPE']

                if len(content) > FEEDBACKTEXT_LIMIT:
                    with tempfile.TemporaryFile() as tmp:
                        tmp.write(content.encode('utf-8'))
                        tmp.seek(0)
                        feedback_ob.manage_uploadFeedback(tmp, filename='qa-output')
                    feedback_attach = feedback_ob.objectValues()[0]
                    feedback_attach.data_file.content_type = content_type
                    feedback_ob.feedbacktext = (
                        'Feedback too large for inline display; '
                        '<a href="qa-output/view">see attachment</a>.')
                    feedback_ob.content_type = 'text/html'

                else:
                    feedback_ob.feedbacktext = content
                    feedback_ob.content_type = content_type

                if l_ret['FEEDBACK_STATUS'] == 'BLOCKER':
                    l_workitem.blocker = True
                    feedback_ob.message=l_ret.get('FEEDBACK_MESSAGE', '')

                l_getResultDict = {p_jobID: {'code':1, 'fileURL':l_file_url}}
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_getResult=l_getResultDict)
            # not ready
            elif l_ret['CODE'] == '1':
                l_nRetries = int(l_wk_prop['getResult'][p_jobID]['retries_left'])
                if l_nRetries > 0:
                    l_getResultDict = {p_jobID: {'code':0, 'retries_left':l_nRetries - 1, 'last_error':l_ret['VALUE'], 'next_run':DateTime()}}
                    self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_getResult=l_getResultDict)
                else:
                    l_workitem.addEvent('Error in the %s, job #%s for file %s: %s' % (self.app_name, p_jobID, l_file_id, l_ret['VALUE']))
                    l_getResultDict = {p_jobID: {'code':-2, 'last_error':l_ret['VALUE']}}
                    self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_getResult=l_getResultDict)
            # error, do not retry
            else:
                l_workitem.addEvent('Error in the %s, job #%s for file %s: %s' % (self.app_name, p_jobID, l_file_id, l_ret['VALUE']))
                l_getResultDict = {p_jobID: {'code':-2, 'last_error':l_ret['VALUE']}}
                self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_getResult=l_getResultDict)
        # Fatal error - do not retry
        except Exception, err:
            feedback_log.exception("Error saving remote feedback, job #%s",
                                   p_jobID)
            l_workitem.addEvent('Error in the %s, job #%s for file %s: %s' % (self.app_name, p_jobID, l_file_id, str(err)))
            l_getResultDict = {p_jobID: {'code':-2, 'last_error':str(err)}}
            self.__manageAutomaticProperty(p_workitem_id=p_workitem_id, p_getResult=l_getResultDict)
        return l_getResultDict

    ##############################################
    #   Private functions
    ##############################################

    def __initializeWorkitem(self, p_workitem_id):
        """ Adds QA-specific extra properties to the workitem """
        l_workitem = getattr(self, p_workitem_id)
        setattr(l_workitem, self.app_name, {})
        eval('l_workitem.' + self.app_name)['analyze'] = {'code':0,
                                    'retries_left':self.nRetries,
                                    'last_error':None,
                                    'next_run':DateTime()
                                   }
        eval('l_workitem.' + self.app_name)['getResult'] = {}

    def __manageAutomaticProperty(self, p_workitem_id, p_analyze={}, p_getResult={}):
        """ 
        The instance data for the RemoteApplication is stored in the workitem
        as an additional property - app_name - contaning a dictionary like:
        {
            'analyze':      {code, retries_left, last_error, next_run}, 
            'getResult':    {jobID: {code, retries_left, last_error, next_run, fileURL}}
        }
        Possible codes for app_name['analyze']:
            0 - started
            1 - done
            -2 - failed
            2 - nothing found to assess

        Possible codes for app_name['getResult'][jobID]:
            0 - started
            1 - result succefully brought
            -2 - failed
        """
        l_workitem = getattr(self, p_workitem_id)
        l_qa = eval('l_workitem.' + self.app_name)

        for l_key in p_analyze.keys():
            l_qa['analyze'][l_key] = p_analyze[l_key]

        for l_job, l_value in p_getResult.items():
            if not l_qa['getResult'].has_key(l_job): l_qa['getResult'][l_job] = {}
            l_qa['getResult'][l_job].update(l_value)
        # make sure it saves the object
        l_workitem._p_changed = 1


    def __finishApplication(self, p_workitem_id, REQUEST=None):
        """ Completes the workitem and forwards it """
        self.activateWorkitem(p_workitem_id, actor='openflow_engine')
        self.completeWorkitem(p_workitem_id, actor='openflow_engine', REQUEST=REQUEST)

    security.declareProtected(view_management_screens, 'manage_settings_html')
    manage_settings_html = PageTemplateFile('zpt/remote/application_edit', globals())

InitializeClass(RemoteApplication)
