# copyright 2003-2014 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/>.

"""unit tests for selectors mechanism"""

from operator import eq, lt, le, gt

from contextlib import contextmanager

from logilab.common.testlib import TestCase, unittest_main

from logilab.common.decorators import clear_cache

from cubicweb import Binary

from cubicweb.devtools.testlib import CubicWebTC

from cubicweb.predicates import (is_instance, adaptable, match_kwargs, match_user_groups,

                                multi_lines_rset, score_entity, is_in_state,

                                rql_condition, relation_possible)

from cubicweb.selectors import on_transition # XXX on_transition is deprecated

from cubicweb.view import EntityAdapter

from cubicweb.web import action

class ImplementsTC(CubicWebTC):

    def test_etype_priority(self):

        with self.admin_access.web_request() as req:

            f = req.create_entity('File', data_name=u'hop.txt', data=Binary('hop'))

            rset = f.as_rset()

            anyscore = is_instance('Any')(f.__class__, req, rset=rset)

            idownscore = adaptable('IDownloadable')(f.__class__, req, rset=rset)

            self.assertTrue(idownscore > anyscore, (idownscore, anyscore))

            filescore = is_instance('File')(f.__class__, req, rset=rset)

            self.assertTrue(filescore > idownscore, (filescore, idownscore))

    def test_etype_inheritance_no_yams_inheritance(self):

        cls = self.vreg['etypes'].etype_class('Personne')

        with self.admin_access.web_request() as req:

            self.assertFalse(is_instance('Societe').score_class(cls, req))

    def test_yams_inheritance(self):

        cls = self.vreg['etypes'].etype_class('Transition')

        with self.admin_access.web_request() as req:

            self.assertEqual(is_instance('BaseTransition').score_class(cls, req),

                             3)

    def test_outer_join(self):

        with self.admin_access.web_request() as req:

            rset = req.execute('Any U,B WHERE B? bookmarked_by U, U login "anon"')

            self.assertEqual(is_instance('Bookmark')(None, req, rset=rset, row=0, col=1),

                             0)

class WorkflowSelectorTC(CubicWebTC):

    def setUp(self):

        super(WorkflowSelectorTC, self).setUp()

        # enable debug mode to state/transition validation on the fly

        self.vreg.config.debugmode = True

    def tearDown(self):

        self.vreg.config.debugmode = False

        super(WorkflowSelectorTC, self).tearDown()

    def setup_database(self):

        with self.admin_access.shell() as shell:

            wf = shell.add_workflow("wf_test", 'StateFull', default=True)

            created   = wf.add_state('created', initial=True)

            validated = wf.add_state('validated')

            abandoned = wf.add_state('abandoned')

            wf.add_transition('validate', created, validated, ('managers',))

            wf.add_transition('forsake', (created, validated,), abandoned, ('managers',))

    @contextmanager

    def statefull_stuff(self):

        with self.admin_access.web_request() as req:

            wf_entity = req.create_entity('StateFull', name=u'')

            rset = wf_entity.as_rset()

            adapter = wf_entity.cw_adapt_to('IWorkflowable')

            req.cnx.commit()

            self.assertEqual(adapter.state, 'created')

            yield req, wf_entity, rset, adapter

    def test_is_in_state(self):

        with self.statefull_stuff() as (req, wf_entity, rset, adapter):

            for state in ('created', 'validated', 'abandoned'):

                selector = is_in_state(state)

                self.assertEqual(selector(None, req, rset=rset),

                                 state=="created")

            adapter.fire_transition('validate')

            req.cnx.commit(); wf_entity.cw_clear_all_caches()

            self.assertEqual(adapter.state, 'validated')

            clear_cache(rset, 'get_entity')

            selector = is_in_state('created')

            self.assertEqual(selector(None, req, rset=rset), 0)

            selector = is_in_state('validated')

            self.assertEqual(selector(None, req, rset=rset), 1)

            selector = is_in_state('validated', 'abandoned')

            self.assertEqual(selector(None, req, rset=rset), 1)

            selector = is_in_state('abandoned')

            self.assertEqual(selector(None, req, rset=rset), 0)

            adapter.fire_transition('forsake')

            req.cnx.commit(); wf_entity.cw_clear_all_caches()

            self.assertEqual(adapter.state, 'abandoned')

            clear_cache(rset, 'get_entity')

            selector = is_in_state('created')

            self.assertEqual(selector(None, req, rset=rset), 0)

            selector = is_in_state('validated')

            self.assertEqual(selector(None, req, rset=rset), 0)

            selector = is_in_state('validated', 'abandoned')

            self.assertEqual(selector(None, req, rset=rset), 1)

            self.assertEqual(adapter.state, 'abandoned')

            self.assertEqual(selector(None, req, rset=rset), 1)

    def test_is_in_state_unvalid_names(self):

        with self.statefull_stuff() as (req, wf_entity, rset, adapter):

            selector = is_in_state("unknown")

            with self.assertRaises(ValueError) as cm:

                selector(None, req, rset=rset)

            self.assertEqual(str(cm.exception),

                             "wf_test: unknown state(s): unknown")

            selector = is_in_state("weird", "unknown", "created", "weird")

            with self.assertRaises(ValueError) as cm:

                selector(None, req, rset=rset)

            self.assertEqual(str(cm.exception),

                             "wf_test: unknown state(s): unknown,weird")

    def test_on_transition(self):

        with self.statefull_stuff() as (req, wf_entity, rset, adapter):

            for transition in ('validate', 'forsake'):

                selector = on_transition(transition)

                self.assertEqual(selector(None, req, rset=rset), 0)

            adapter.fire_transition('validate')

            req.cnx.commit(); wf_entity.cw_clear_all_caches()

            self.assertEqual(adapter.state, 'validated')

            clear_cache(rset, 'get_entity')

            selector = on_transition("validate")

            self.assertEqual(selector(None, req, rset=rset), 1)

            selector = on_transition("validate", "forsake")

            self.assertEqual(selector(None, req, rset=rset), 1)

            selector = on_transition("forsake")

            self.assertEqual(selector(None, req, rset=rset), 0)

            adapter.fire_transition('forsake')

            req.cnx.commit(); wf_entity.cw_clear_all_caches()

            self.assertEqual(adapter.state, 'abandoned')

            clear_cache(rset, 'get_entity')

            selector = on_transition("validate")

            self.assertEqual(selector(None, req, rset=rset), 0)

            selector = on_transition("validate", "forsake")

            self.assertEqual(selector(None, req, rset=rset), 1)

            selector = on_transition("forsake")

            self.assertEqual(selector(None, req, rset=rset), 1)

    def test_on_transition_unvalid_names(self):

        with self.statefull_stuff() as (req, wf_entity, rset, adapter):

            selector = on_transition("unknown")

            with self.assertRaises(ValueError) as cm:

                selector(None, req, rset=rset)

            self.assertEqual(str(cm.exception),

                             "wf_test: unknown transition(s): unknown")

            selector = on_transition("weird", "unknown", "validate", "weird")

            with self.assertRaises(ValueError) as cm:

                selector(None, req, rset=rset)

            self.assertEqual(str(cm.exception),

                             "wf_test: unknown transition(s): unknown,weird")

    def test_on_transition_with_no_effect(self):

        """selector will not be triggered with `change_state()`"""

        with self.statefull_stuff() as (req, wf_entity, rset, adapter):

            adapter.change_state('validated')

            req.cnx.commit(); wf_entity.cw_clear_all_caches()

            self.assertEqual(adapter.state, 'validated')

            selector = on_transition("validate")

            self.assertEqual(selector(None, req, rset=rset), 0)

            selector = on_transition("validate", "forsake")

            self.assertEqual(selector(None, req, rset=rset), 0)

            selector = on_transition("forsake")

            self.assertEqual(selector(None, req, rset=rset), 0)

class RelationPossibleTC(CubicWebTC):

    def test_rqlst_1(self):

        with self.admin_access.web_request() as req:

            selector = relation_possible('in_group')

            select = self.vreg.parse(req, 'Any X WHERE X is CWUser').children[0]

            score = selector(None, req, rset=1,

                             select=select, filtered_variable=select.defined_vars['X'])

            self.assertEqual(score, 1)

    def test_rqlst_2(self):

        with self.admin_access.web_request() as req:

            selector = relation_possible('in_group')

            select = self.vreg.parse(req, 'Any 1, COUNT(X) WHERE X is CWUser, X creation_date XD, '

                                     'Y creation_date YD, Y is CWGroup '

                                     'HAVING DAY(XD)=DAY(YD)').children[0]

            score = selector(None, req, rset=1,

                             select=select, filtered_variable=select.defined_vars['X'])

            self.assertEqual(score, 1)

    def test_ambiguous(self):

        # Ambiguous relations are :

        # (Service, fabrique_par, Personne) and (Produit, fabrique_par, Usine)

        # There used to be a crash here with a bad rdef choice in the strict

        # checking case.

        selector = relation_possible('fabrique_par', role='object',

                                     target_etype='Personne', strict=True)

        with self.admin_access.web_request() as req:

            usine = req.create_entity('Usine', lieu=u'here')

            score = selector(None, req, rset=usine.as_rset())

            self.assertEqual(0, score)

class MatchUserGroupsTC(CubicWebTC):

    def test_owners_group(self):

        """tests usage of 'owners' group with match_user_group"""

        class SomeAction(action.Action):

            __regid__ = 'yo'

            category = 'foo'

            __select__ = match_user_groups('owners')

        self.vreg._loadedmods[__name__] = {}

        self.vreg.register(SomeAction)

        SomeAction.__registered__(self.vreg['actions'])

        self.assertTrue(SomeAction in self.vreg['actions']['yo'], self.vreg['actions'])

        try:

            with self.admin_access.web_request() as req:

                self.create_user(req, 'john')

            # login as a simple user

            john_access = self.new_access('john')

            with john_access.web_request() as req:

                # it should not be possible to use SomeAction not owned objects

                rset = req.execute('Any G WHERE G is CWGroup, G name "managers"')

                self.assertFalse('yo' in dict(self.pactions(req, rset)))

                # insert a new card, and check that we can use SomeAction on our object

                req.execute('INSERT Card C: C title "zoubidou"')

                req.cnx.commit()

            with john_access.web_request() as req:

                rset = req.execute('Card C WHERE C title "zoubidou"')

                self.assertTrue('yo' in dict(self.pactions(req, rset)), self.pactions(req, rset))

            # make sure even managers can't use the action

            with self.admin_access.web_request() as req:

                rset = req.execute('Card C WHERE C title "zoubidou"')

                self.assertFalse('yo' in dict(self.pactions(req, rset)))

        finally:

            del self.vreg[SomeAction.__registry__][SomeAction.__regid__]

class MultiLinesRsetTC(CubicWebTC):

    def setup_database(self):

        with self.admin_access.web_request() as req:

            req.execute('INSERT CWGroup G: G name "group1"')

            req.execute('INSERT CWGroup G: G name "group2"')

            req.cnx.commit()

    def test_default_op_in_selector(self):

        with self.admin_access.web_request() as req:

            rset = req.execute('Any G WHERE G is CWGroup')

            expected = len(rset)

            selector = multi_lines_rset(expected)

            self.assertEqual(selector(None, req, rset=rset), 1)

            self.assertEqual(selector(None, req, None), 0)

            selector = multi_lines_rset(expected + 1)

            self.assertEqual(selector(None, req, rset=rset), 0)

            self.assertEqual(selector(None, req, None), 0)

            selector = multi_lines_rset(expected - 1)

            self.assertEqual(selector(None, req, rset=rset), 0)

            self.assertEqual(selector(None, req, None), 0)

    def test_without_rset(self):

        with self.admin_access.web_request() as req:

            rset = req.execute('Any G WHERE G is CWGroup')

            expected = len(rset)

            selector = multi_lines_rset(expected)

            self.assertEqual(selector(None, req, None), 0)

            selector = multi_lines_rset(expected + 1)

            self.assertEqual(selector(None, req, None), 0)

            selector = multi_lines_rset(expected - 1)

            self.assertEqual(selector(None, req, None), 0)

    def test_with_operators(self):

        with self.admin_access.web_request() as req:

            rset = req.execute('Any G WHERE G is CWGroup')

            expected = len(rset)

            # Format     'expected', 'operator', 'assert'

            testdata = (( expected,         eq,        1),

                        ( expected+1,       eq,        0),

                        ( expected-1,       eq,        0),

                        ( expected,         le,        1),

                        ( expected+1,       le,        1),

                        ( expected-1,       le,        0),

                        ( expected-1,       gt,        1),

                        ( expected,         gt,        0),

                        ( expected+1,       gt,        0),

                        ( expected+1,       lt,        1),

                        ( expected,         lt,        0),

                        ( expected-1,       lt,        0))

            for (expected, operator, assertion) in testdata:

                selector = multi_lines_rset(expected, operator)

                yield self.assertEqual, selector(None, req, rset=rset), assertion

class MatchKwargsTC(TestCase):

    def test_match_kwargs_default(self):

        selector = match_kwargs( set( ('a', 'b') ) )

        self.assertEqual(selector(None, None, a=1, b=2), 2)

        self.assertEqual(selector(None, None, a=1), 0)

        self.assertEqual(selector(None, None, c=1), 0)

        self.assertEqual(selector(None, None, a=1, c=1), 0)