# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""workflow views:

* IWorkflowable views and forms

* workflow entities views (State, Transition, TrInfo)

"""

__docformat__ = "restructuredtext en"

_ = unicode

import tempfile

import os

from logilab.mtconverter import xml_escape

from logilab.common.graph import escape, GraphGenerator, DotBackend

from cubicweb import Unauthorized, view

from cubicweb.selectors import (has_related_entities, one_line_rset,

                                relation_possible, match_form_params,

                                score_entity, is_instance, adaptable)

from cubicweb.utils import make_uid

from cubicweb.view import EntityView

from cubicweb.schema import display_name

from cubicweb.web import uicfg, stdmsgs, action, component, form, action

from cubicweb.web import formfields as ff, formwidgets as fwdgs

from cubicweb.web.views import TmpFileViewMixin

from cubicweb.web.views import forms, primary, autoform, ibreadcrumbs

from cubicweb.web.views.tabs import TabbedPrimaryView, PrimaryTab

_pvs = uicfg.primaryview_section

_pvs.tag_subject_of(('Workflow', 'initial_state', '*'), 'hidden')

_pvs.tag_object_of(('*', 'state_of', 'Workflow'), 'hidden')

_pvs.tag_object_of(('*', 'transition_of', 'Workflow'), 'hidden')

_pvs.tag_object_of(('*', 'wf_info_for', '*'), 'hidden')

for rtype in ('in_state', 'by_transition', 'from_state', 'to_state'):

    _pvs.tag_subject_of(('*', rtype, '*'), 'hidden')

    _pvs.tag_object_of(('*', rtype, '*'), 'hidden')

_pvs.tag_object_of(('*', 'wf_info_for', '*'), 'hidden')

_abaa = uicfg.actionbox_appearsin_addmenu

_abaa.tag_subject_of(('BaseTransition', 'condition', 'RQLExpression'), False)

_abaa.tag_subject_of(('State', 'allowed_transition', 'BaseTransition'), False)

_abaa.tag_object_of(('SubWorkflowExitPoint', 'destination_state', 'State'),

                    False)

_abaa.tag_subject_of(('*', 'wf_info_for', '*'), False)

_abaa.tag_object_of(('*', 'wf_info_for', '*'), False)

_abaa.tag_object_of(('*', 'state_of', 'CWEType'), True)

_abaa.tag_object_of(('*', 'transition_of', 'CWEType'), True)

_abaa.tag_subject_of(('Transition', 'destination_state', '*'), True)

_abaa.tag_object_of(('*', 'allowed_transition', 'Transition'), True)

_abaa.tag_object_of(('*', 'destination_state', 'State'), True)

_abaa.tag_subject_of(('State', 'allowed_transition', '*'), True)

_abaa.tag_object_of(('State', 'state_of', 'Workflow'), True)

_abaa.tag_object_of(('Transition', 'transition_of', 'Workflow'), True)

_abaa.tag_object_of(('WorkflowTransition', 'transition_of', 'Workflow'), True)

_afs = uicfg.autoform_section

_afs.tag_subject_of(('TrInfo', 'to_state', '*'), 'main', 'hidden')

_afs.tag_subject_of(('TrInfo', 'from_state', '*'), 'main', 'hidden')

_afs.tag_object_of(('State', 'allowed_transition', '*'), 'main', 'attributes')

# IWorkflowable views #########################################################

class ChangeStateForm(forms.CompositeEntityForm):

    __regid__ = 'changestate'

    form_renderer_id = 'base' # don't want EntityFormRenderer

    form_buttons = [fwdgs.SubmitButton(),

                    fwdgs.Button(stdmsgs.BUTTON_CANCEL, cwaction='cancel')]

class ChangeStateFormView(form.FormViewMixIn, view.EntityView):

    __regid__ = 'statuschange'

    title = _('status change')

    __select__ = (one_line_rset()

                  & match_form_params('treid')

                  & adaptable('IWorkflowable'))

    def cell_call(self, row, col):

        entity = self.cw_rset.get_entity(row, col)

        transition = self._cw.entity_from_eid(self._cw.form['treid'])

        form = self.get_form(entity, transition)

        self.w(u'<h4>%s %s</h4>\n' % (self._cw._(transition.name),

                                      entity.view('oneline')))

        msg = self._cw._('status will change from %(st1)s to %(st2)s') % {

            'st1': entity.cw_adapt_to('IWorkflowable').printable_state,

            'st2': self._cw._(transition.destination(entity).name)}

        self.w(u'<p>%s</p>\n' % msg)

        self.w(form.render())

    def redirectpath(self, entity):

        return entity.rest_path()

    def get_form(self, entity, transition, **kwargs):

        # XXX used to specify both rset/row/col and entity in case implements

        # selector (and not implements) is used on custom form

        form = self._cw.vreg['forms'].select(

            'changestate', self._cw, entity=entity, transition=transition,

            redirect_path=self.redirectpath(entity), **kwargs)

        trinfo = self._cw.vreg['etypes'].etype_class('TrInfo')(self._cw)

        trinfo.eid = self._cw.varmaker.next()

        subform = self._cw.vreg['forms'].select('edition', self._cw, entity=trinfo,

                                                mainform=False)

        subform.field_by_name('wf_info_for', 'subject').value = entity.eid

        trfield = subform.field_by_name('by_transition', 'subject')

        trfield.widget = fwdgs.HiddenInput()

        trfield.value = transition.eid

        form.add_subform(subform)

        return form

class WFHistoryView(EntityView):

    __regid__ = 'wfhistory'

    __select__ = relation_possible('wf_info_for', role='object') & \

                 score_entity(lambda x: x.cw_adapt_to('IWorkflowable').workflow_history)

    title = _('Workflow history')

    def cell_call(self, row, col, view=None):

        _ = self._cw._

        eid = self.cw_rset[row][col]

        sel = 'Any FS,TS,WF,D'

        rql = ' ORDERBY D DESC WHERE WF wf_info_for X,'\

              'WF from_state FS, WF to_state TS, WF comment C,'\

              'WF creation_date D'

        if self._cw.vreg.schema.eschema('CWUser').has_perm(self._cw, 'read'):

            sel += ',U,C'

            rql += ', WF owned_by U?'

            displaycols = range(5)

            headers = (_('from_state'), _('to_state'), _('comment'), _('date'),

                       _('CWUser'))

        else:

            sel += ',C'

            displaycols = range(4)

            headers = (_('from_state'), _('to_state'), _('comment'), _('date'))

        rql = '%s %s, X eid %%(x)s' % (sel, rql)

        try:

            rset = self._cw.execute(rql, {'x': eid})

        except Unauthorized:

            return

        if rset:

            self.wview('table', rset, title=_(self.title), displayactions=False,

                       displaycols=displaycols, headers=headers)

class WFHistoryVComponent(component.EntityVComponent):

    """display the workflow history for entities supporting it"""

    __regid__ = 'wfhistory'

    __select__ = WFHistoryView.__select__ & component.EntityVComponent.__select__

    context = 'navcontentbottom'

    title = _('Workflow history')

    def cell_call(self, row, col, view=None):

        self.wview('wfhistory', self.cw_rset, row=row, col=col, view=view)

# workflow actions #############################################################

class WorkflowActions(action.Action):

    """fill 'workflow' sub-menu of the actions box"""

    __regid__ = 'workflow'

    __select__ = (action.Action.__select__ & one_line_rset() &

                  relation_possible('in_state'))

    submenu = _('workflow')

    order = 10

    def fill_menu(self, box, menu):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        menu.label = u'%s: %s' % (self._cw._('state'),

                                  entity.cw_adapt_to('IWorkflowable').printable_state)

        menu.append_anyway = True

        super(WorkflowActions, self).fill_menu(box, menu)

    def actual_actions(self):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        iworkflowable = entity.cw_adapt_to('IWorkflowable')

        hastr = False

        for tr in iworkflowable.possible_transitions():

            url = entity.absolute_url(vid='statuschange', treid=tr.eid)

            yield self.build_action(self._cw._(tr.name), url)

            hastr = True

        # don't propose to see wf if user can't pass any transition

        if hastr:

            wfurl = iworkflowable.current_workflow.absolute_url()

            yield self.build_action(self._cw._('view workflow'), wfurl)

        if iworkflowable.workflow_history:

            wfurl = entity.absolute_url(vid='wfhistory')

            yield self.build_action(self._cw._('view history'), wfurl)

# workflow entity types views ##################################################

_pvs = uicfg.primaryview_section

_pvs.tag_subject_of(('Workflow', 'initial_state', '*'), 'hidden')

_pvs.tag_object_of(('*', 'state_of', 'Workflow'), 'hidden')

_pvs.tag_object_of(('*', 'transition_of', 'Workflow'), 'hidden')

_pvs.tag_object_of(('*', 'default_workflow', 'Workflow'), 'hidden')

_abaa = uicfg.actionbox_appearsin_addmenu

_abaa.tag_subject_of(('BaseTransition', 'condition', 'RQLExpression'), False)

_abaa.tag_subject_of(('State', 'allowed_transition', 'BaseTransition'), False)

_abaa.tag_object_of(('SubWorkflowExitPoint', 'destination_state', 'State'),

                    False)

_abaa.tag_object_of(('State', 'state_of', 'Workflow'), True)

_abaa.tag_object_of(('BaseTransition', 'transition_of', 'Workflow'), False)

_abaa.tag_object_of(('Transition', 'transition_of', 'Workflow'), True)

_abaa.tag_object_of(('WorkflowTransition', 'transition_of', 'Workflow'), True)

class WorkflowPrimaryView(TabbedPrimaryView):

    __select__ = is_instance('Workflow')

    tabs = [  _('wf_tab_info'), _('wfgraph'),]

    default_tab = 'wf_tab_info'

class CellView(view.EntityView):

    __regid__ = 'cell'

    __select__ = is_instance('TrInfo')

    def cell_call(self, row, col, cellvid=None):

        self.w(self.cw_rset.get_entity(row, col).view('reledit', rtype='comment'))

class StateInContextView(view.EntityView):

    """convenience trick, State's incontext view should not be clickable"""

    __regid__ = 'incontext'

    __select__ = is_instance('State')

    def cell_call(self, row, col):

        self.w(xml_escape(self._cw.view('textincontext', self.cw_rset,

                                        row=row, col=col)))

class WorkflowTabTextView(PrimaryTab):

    __regid__ = 'wf_tab_info'

    __select__ = PrimaryTab.__select__ & one_line_rset() & is_instance('Workflow')

    def render_entity_attributes(self, entity):

        _ = self._cw._

        self.w(u'<div>%s</div>' % (entity.printable_value('description')))

        self.w(u'<span>%s%s</span>' % (_("workflow_of").capitalize(), _(" :")))

        html = []

        for e in  entity.workflow_of:

            view = e.view('outofcontext')

            if entity.eid == e.default_workflow[0].eid:

                view += u' <span>[%s]</span>' % _('default_workflow')

            html.append(view)

        self.w(', '.join(v for v in html))

        self.w(u'<h2>%s</h2>' % _("Transition_plural"))

        rset = self._cw.execute(

            'Any T,T,DS,T,TT ORDERBY TN WHERE T transition_of WF, WF eid %(x)s,'

            'T type TT, T name TN, T destination_state DS?', {'x': entity.eid})

        self.wview('editable-table', rset, 'null',

                   cellvids={ 1: 'trfromstates', 2: 'outofcontext', 3:'trsecurity',},

                   headers = (_('Transition'),  _('from_state'),

                              _('to_state'), _('permissions'), _('type') ),

                   )

class TransitionSecurityTextView(view.EntityView):

    __regid__ = 'trsecurity'

    __select__ = is_instance('Transition')

    def cell_call(self, row, col):

        _ = self._cw._

        entity = self.cw_rset.get_entity(self.cw_row, self.cw_col)

        if entity.require_group:

            self.w(u'<div>%s%s %s</div>' %

                   (_('groups'), _(" :"),

                    u', '.join((g.view('incontext') for g

                               in entity.require_group))))

        if entity.condition:

            self.w(u'<div>%s%s %s</div>' %

                   ( _('conditions'), _(" :"),

                     u'<br/>'.join((e.dc_title() for e

                                in entity.condition))))

class TransitionAllowedTextView(view.EntityView):

    __regid__ = 'trfromstates'

    __select__ = is_instance('Transition')

    def cell_call(self, row, col):

        entity = self.cw_rset.get_entity(self.cw_row, self.cw_col)

        self.w(u', '.join((e.view('outofcontext') for e

                           in entity.reverse_allowed_transition)))

# workflow entity types edition ################################################

_afs = uicfg.autoform_section

_afs.tag_subject_of(('TrInfo', 'to_state', '*'), 'main', 'hidden')

_afs.tag_subject_of(('TrInfo', 'from_state', '*'), 'main', 'hidden')

_afs.tag_object_of(('State', 'allowed_transition', '*'), 'main', 'attributes')

_afs.tag_subject_of(('State', 'allowed_transition', '*'), 'main', 'attributes')

def workflow_items_for_relation(req, wfeid, wfrelation, targetrelation):

    wf = req.entity_from_eid(wfeid)

    rschema = req.vreg.schema[targetrelation]

    return sorted((e.view('combobox'), e.eid)

                  for e in getattr(wf, 'reverse_%s' % wfrelation)

                  if rschema.has_perm(req, 'add', toeid=e.eid))

class TransitionEditionForm(autoform.AutomaticEntityForm):

    __select__ = is_instance('Transition')

    def workflow_states_for_relation(self, targetrelation):

        eids = self.edited_entity.linked_to('transition_of', 'subject')

        if eids:

            return workflow_items_for_relation(self._cw, eids[0], 'state_of',

                                               targetrelation)

        return []

    def subject_destination_state_vocabulary(self, rtype, limit=None):

        if not self.edited_entity.has_eid():

            return self.workflow_states_for_relation('destination_state')

        return self.subject_relation_vocabulary(rtype, limit)

    def object_allowed_transition_vocabulary(self, rtype, limit=None):

        if not self.edited_entity.has_eid():

            return self.workflow_states_for_relation('allowed_transition')

        return self.object_relation_vocabulary(rtype, limit)

class StateEditionForm(autoform.AutomaticEntityForm):