# copyright 2003-2016 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/>.

"""some utilities to ease repository testing

This module contains functions to initialize a new repository.

"""

from __future__ import print_function

from pprint import pprint

from logilab.common.decorators import cachedproperty

from logilab.common.testlib import SkipTest

from cubicweb.devtools.testlib import RepoAccess

def tuplify(mylist):

    return [tuple(item) for item in mylist]

def snippet_key(a):

    # a[0] may be a dict or a key/value tuple

    return (sorted(dict(a[0]).items()), [e.expression for e in a[1]])

def check_plan(self, rql, expected, kwargs=None):

    with self.session.new_cnx() as cnx:

        plan = self._prepare_plan(cnx, rql, kwargs)

        self.planner.build_plan(plan)

        try:

            self.assertEqual(len(plan.steps), len(expected),

                             'expected %s steps, got %s' % (len(expected), len(plan.steps)))

            # step order is important

            for i, step in enumerate(plan.steps):

                compare_steps(self, step.test_repr(), expected[i])

        except AssertionError:

            pprint([step.test_repr() for step in plan.steps])

            raise

def compare_steps(self, step, expected):

    try:

        self.assertEqual(step[0], expected[0], 'expected step type %s, got %s' % (expected[0], step[0]))

        if len(step) > 2 and isinstance(step[1], list) and isinstance(expected[1], list):

            queries, equeries = step[1], expected[1]

            self.assertEqual(len(queries), len(equeries),

                              'expected %s queries, got %s' % (len(equeries), len(queries)))

            for i, (rql, sol) in enumerate(queries):

                self.assertEqual(rql, equeries[i][0])

                self.assertEqual(sorted(sorted(x.items()) for x in sol), sorted(sorted(x.items()) for x in equeries[i][1]))

            idx = 2

        else:

            idx = 1

        self.assertEqual(step[idx:-1], expected[idx:-1],

                          'expected step characteristic \n%s\n, got\n%s' % (expected[1:-1], step[1:-1]))

        self.assertEqual(len(step[-1]), len(expected[-1]),

                          'got %s child steps, expected %s' % (len(step[-1]), len(expected[-1])))

    except AssertionError:

        print('error on step ', end=' ')

        pprint(step[:-1])

        raise

    children = step[-1]

    if step[0] in ('UnionFetchStep', 'UnionStep'):

        # sort children

        children = sorted(children)

        expectedchildren = sorted(expected[-1])

    else:

        expectedchildren = expected[-1]

    for i, substep in enumerate(children):

        compare_steps(self, substep, expectedchildren[i])

class DumbOrderedDict(list):

    def __iter__(self):

        return self.iterkeys()

    def __contains__(self, key):

        return key in self.iterkeys()

    def __getitem__(self, key):

        for key_, value in list.__iter__(self):

            if key == key_:

                return value

        raise KeyError(key)

    def iterkeys(self):

        return (x for x, y in list.__iter__(self))

    def iteritems(self):

        return (x for x in list.__iter__(self))

    def items(self):

        return [x for x in list.__iter__(self)]

def schema_eids_idx(schema):

    """return a dictionary mapping schema types to their eids so we can reread

    it from the fs instead of the db (too costly) between tests

    """

    schema_eids = {}

    for x in schema.entities():

        schema_eids[x] = x.eid

    for x in schema.relations():

        schema_eids[x] = x.eid

        for rdef in x.rdefs.values():

            schema_eids[(rdef.subject, rdef.rtype, rdef.object)] = rdef.eid

    return schema_eids

def restore_schema_eids_idx(schema, schema_eids):

    """rebuild schema eid index"""

    for x in schema.entities():

        x.eid = schema_eids[x]

        schema._eid_index[x.eid] = x

    for x in schema.relations():

        x.eid = schema_eids[x]

        schema._eid_index[x.eid] = x

        for rdef in x.rdefs.values():

            rdef.eid = schema_eids[(rdef.subject, rdef.rtype, rdef.object)]

            schema._eid_index[rdef.eid] = rdef

from logilab.common.testlib import TestCase, mock_object

from logilab.database import get_db_helper

from rql import RQLHelper

from cubicweb.devtools.testlib import BaseTestCase

from cubicweb.devtools.fake import FakeRepo, FakeConfig, FakeSession, FakeRequest

from cubicweb.server import set_debug, debugged

from cubicweb.server.querier import QuerierHelper

from cubicweb.server.session import Session

from cubicweb.server.sources.rql2sql import SQLGenerator, remove_unused_solutions

class RQLGeneratorTC(BaseTestCase):

    schema = backend = None # set this in concrete class

    @classmethod

    def setUpClass(cls):

        if cls.backend is not None:

            try:

                cls.dbhelper = get_db_helper(cls.backend)

            except ImportError as ex:

                raise SkipTest(str(ex))

    def setUp(self):

        self.repo = FakeRepo(self.schema, config=FakeConfig(apphome=self.datadir))

        self.repo.system_source = mock_object(dbdriver=self.backend)

        self.rqlhelper = RQLHelper(self.schema,

                                   special_relations={'eid': 'uid',

                                                      'has_text': 'fti'},

                                   backend=self.backend)

        self.qhelper = QuerierHelper(self.repo, self.schema)

        ExecutionPlan._check_permissions = _dummy_check_permissions

        rqlannotation._select_principal = _select_principal

        if self.backend is not None:

            self.o = SQLGenerator(self.schema, self.dbhelper)

    def tearDown(self):

        ExecutionPlan._check_permissions = _orig_check_permissions

        rqlannotation._select_principal = _orig_select_principal

    def set_debug(self, debug):

        set_debug(debug)

    def debugged(self, debug):

        return debugged(debug)

    def _prepare(self, rql):

        #print '******************** prepare', rql

        union = self.rqlhelper.parse(rql)

        #print '********* parsed', union.as_string()

        self.rqlhelper.compute_solutions(union)

        #print '********* solutions', solutions

        self.rqlhelper.simplify(union)

        #print '********* simplified', union.as_string()

        plan = self.qhelper.plan_factory(union, {}, FakeSession(self.repo))

        plan.preprocess(union)

        for select in union.children:

            select.solutions.sort(key=lambda x: list(x.items()))

        #print '********* ppsolutions', solutions

        return union

class BaseQuerierTC(TestCase):

    repo = None # set this in concrete class

    @cachedproperty

    def session(self):

        return self._access._session

    def setUp(self):

        self.o = self.repo.querier

        self._access = RepoAccess(self.repo, 'admin', FakeRequest)

        self.ueid = self.session.user.eid

        assert self.ueid != -1

        self.repo._type_cache = {} # clear cache

        self.maxeid = self.get_max_eid()

        do_monkey_patch()

        self._dumb_sessions = []

    def get_max_eid(self):

        with self.session.new_cnx() as cnx:

            return cnx.execute('Any MAX(X)')[0][0]

    def cleanup(self):

        with self.session.new_cnx() as cnx:

            cnx.execute('DELETE Any X WHERE X eid > %s' % self.maxeid)

            cnx.commit()

    def tearDown(self):

        undo_monkey_patch()

        self.cleanup()

        assert self.session.user.eid != -1

    def set_debug(self, debug):

        set_debug(debug)

    def debugged(self, debug):

        return debugged(debug)

    def _rqlhelper(self):

        rqlhelper = self.repo.vreg.rqlhelper

        # reset uid_func so it don't try to get type from eids

        rqlhelper._analyser.uid_func = None

        rqlhelper._analyser.uid_func_mapping = {}

        return rqlhelper

    def _prepare_plan(self, cnx, rql, kwargs=None, simplify=True):

        rqlhelper = self._rqlhelper()

        rqlst = rqlhelper.parse(rql)

        rqlhelper.compute_solutions(rqlst, kwargs=kwargs)

        if simplify:

            rqlhelper.simplify(rqlst)

        for select in rqlst.children:

            select.solutions.sort(key=lambda x: list(x.items()))

        return self.o.plan_factory(rqlst, kwargs, cnx)

    def _prepare(self, cnx, rql, kwargs=None):

        plan = self._prepare_plan(cnx, rql, kwargs, simplify=False)

        plan.preprocess(plan.rqlst)

        rqlst = plan.rqlst.children[0]

        rqlst.solutions = remove_unused_solutions(rqlst, rqlst.solutions, self.repo.schema)[0]

        return rqlst

    def user_groups_session(self, *groups):

        """lightweight session using the current user with hi-jacked groups"""

        # use self.session.user.eid to get correct owned_by relation, unless explicit eid

        with self.session.new_cnx() as cnx:

            user_eid = self.session.user.eid

            session = Session(self.repo._build_user(cnx, user_eid), self.repo)

            session.data['%s-groups' % user_eid] = set(groups)

            return session

    def qexecute(self, rql, args=None, build_descr=True):

        with self.session.new_cnx() as cnx:

            try:

                return self.o.execute(cnx, rql, args, build_descr)

            finally:

                if rql.startswith(('INSERT', 'DELETE', 'SET')):

                    cnx.commit()

class BasePlannerTC(BaseQuerierTC):

    def setup(self):

        # XXX source_defs

        self.o = self.repo.querier

        self.session = self.repo._sessions.values()[0]

        self.schema = self.o.schema

        self.system = self.repo.system_source

        do_monkey_patch()

        self.repo.vreg.rqlhelper.backend = 'postgres' # so FTIRANK is considered

    def tearDown(self):

        undo_monkey_patch()

    def _prepare_plan(self, cnx, rql, kwargs=None):

        rqlst = self.o.parse(rql, annotate=True)

        self.o.solutions(cnx, rqlst, kwargs)

        if rqlst.TYPE == 'select':

            self.repo.vreg.rqlhelper.annotate(rqlst)

            for select in rqlst.children:

                select.solutions.sort(key=lambda x: list(x.items()))

        else:

            rqlst.solutions.sort(key=lambda x: list(x.items()))

        return self.o.plan_factory(rqlst, kwargs, cnx)

# monkey patch some methods to get predictable results #######################

from cubicweb import rqlrewrite

_orig_iter_relations = rqlrewrite.iter_relations

_orig_insert_snippets = rqlrewrite.RQLRewriter.insert_snippets

_orig_build_variantes = rqlrewrite.RQLRewriter.build_variantes

def _insert_snippets(self, snippets, varexistsmap=None):

    _orig_insert_snippets(self, sorted(snippets, key=snippet_key), varexistsmap)

def _build_variantes(self, newsolutions):

    variantes = _orig_build_variantes(self, newsolutions)

    sortedvariantes = []

    for variante in variantes:

        orderedkeys = sorted((k[1], k[2], v) for k, v in variante.items())

        variante = DumbOrderedDict(sorted(variante.items(),

                                          key=lambda a: (a[0][1], a[0][2], a[1])))

        sortedvariantes.append( (orderedkeys, variante) )

    return [v for ok, v in sorted(sortedvariantes)]

from cubicweb.server.querier import ExecutionPlan

_orig_check_permissions = ExecutionPlan._check_permissions

def _check_permissions(*args, **kwargs):

    res, restricted = _orig_check_permissions(*args, **kwargs)

    res = DumbOrderedDict(sorted(res.items(), key=lambda x: [list(y.items()) for y in x[1]]))

    return res, restricted

def _dummy_check_permissions(self, rqlst):

    return {(): rqlst.solutions}, set()

from cubicweb.server import rqlannotation

_orig_select_principal = rqlannotation._select_principal

def _select_principal(scope, relations):

    def sort_key(something):

        try:

            return something.r_type

        except AttributeError:

            return (something[0].r_type, something[1])

    return _orig_select_principal(scope, relations,

                                  _sort=lambda rels: sorted(rels, key=sort_key))

def _ordered_iter_relations(stinfo):

    return sorted(_orig_iter_relations(stinfo), key=lambda x:x.r_type)

def do_monkey_patch():

    rqlrewrite.iter_relations = _ordered_iter_relations

    rqlrewrite.RQLRewriter.insert_snippets = _insert_snippets

    rqlrewrite.RQLRewriter.build_variantes = _build_variantes

    ExecutionPlan._check_permissions = _check_permissions

    ExecutionPlan.tablesinorder = None

def undo_monkey_patch():

    rqlrewrite.iter_relations = _orig_iter_relations

    rqlrewrite.RQLRewriter.insert_snippets = _orig_insert_snippets

    rqlrewrite.RQLRewriter.build_variantes = _orig_build_variantes

    ExecutionPlan._check_permissions = _orig_check_permissions