"""some utilities to ease repository testing

This module contains functions to initialize a new repository.

:organization: Logilab

:copyright: 2003-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from pprint import pprint

def tuplify(list):

    for i in range(len(list)):

        if type(list[i]) is not type(()):

            list[i] = tuple(list[i])

    return list

def snippet_cmp(a, b):

    a = (a[0], [e.expression for e in a[1]])

    b = (b[0], [e.expression for e in b[1]])

    return cmp(a, b)

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

    plan = self._prepare_plan(rql, kwargs)

    self.planner.build_plan(plan)

    try:

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

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

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

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

                self.assertEquals(sol, equeries[i][1])

            idx = 2

        else:

            idx = 1

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

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

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

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

    except AssertionError:

        print 'error on step ',

        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 self.iteritems():

            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))

from logilab.common.testlib import TestCase

from rql import RQLHelper

from cubicweb.devtools.fake import FakeRepo, FakeSession

from cubicweb.server import set_debug

from cubicweb.server.querier import QuerierHelper

from cubicweb.server.session import Session

from cubicweb.server.sources.rql2sql import remove_unused_solutions

class RQLGeneratorTC(TestCase):

    schema = None # set this in concret test

    def setUp(self):

        self.rqlhelper = RQLHelper(self.schema, special_relations={'eid': 'uid',

                                                                   'has_text': 'fti'})

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

        ExecutionPlan._check_permissions = _dummy_check_permissions

        rqlannotation._select_principal = _select_principal

    def tearDown(self):

        ExecutionPlan._check_permissions = _orig_check_permissions

        rqlannotation._select_principal = _orig_select_principal

    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())

        plan.preprocess(union)

        for select in union.children:

            select.solutions.sort()

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

        return union

class BaseQuerierTC(TestCase):

    repo = None # set this in concret test

    def setUp(self):

        self.o = self.repo.querier

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

        self.ueid = self.session.user.eid

        assert self.ueid != -1

        self.repo._type_source_cache = {} # clear cache

        self.pool = self.session.set_pool()

        self.maxeid = self.get_max_eid()

        do_monkey_patch()

    def get_max_eid(self):

        return self.session.unsafe_execute('Any MAX(X)')[0][0]

    def cleanup(self):

        self.session.unsafe_execute('DELETE Any X WHERE X eid > %s' % self.maxeid)

    def tearDown(self):

        undo_monkey_patch()

        self.session.rollback()

        self.cleanup()

        self.commit()

        self.repo._free_pool(self.pool)

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

    def set_debug(self, debug):

        set_debug(debug)

    def _rqlhelper(self):

        rqlhelper = self.o._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, rql, kwargs=None):

        rqlhelper = self._rqlhelper()

        rqlst = rqlhelper.parse(rql)

        rqlhelper.compute_solutions(rqlst, kwargs=kwargs)

        rqlhelper.simplify(rqlst)

        for select in rqlst.children:

            select.solutions.sort()

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

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

        plan = self._prepare_plan(rql, kwargs)

        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_session(self, groups=('guests',), ueid=None):

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

        if ueid is None:

            ueid = self.session.user.eid

        u = self.repo._build_user(self.session, ueid)

        u._groups = set(groups)

        s = Session(u, self.repo)

        s._threaddata.pool = self.pool

        return u, s

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

        return self.o.execute(self.session, rql, args, eid_key, build_descr)

    def commit(self):

        self.session.commit()

        self.session.set_pool()        

class BasePlannerTC(BaseQuerierTC):

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

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

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

        if rqlst.TYPE == 'select':

            self.o._rqlhelper.annotate(rqlst)

            for select in rqlst.children:

                select.solutions.sort()

        else:

            rqlst.solutions.sort()

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

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

from cubicweb.server.rqlrewrite import RQLRewriter

_orig_insert_snippets = RQLRewriter.insert_snippets

_orig_build_variantes = RQLRewriter.build_variantes

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

    _orig_insert_snippets(self, sorted(snippets, snippet_cmp), 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.iteritems())

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

                                          lambda a,b: cmp((a[0][1],a[0][2],a[1]),

                                                          (b[0][1],b[0][2],b[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

_orig_init_temp_table = ExecutionPlan.init_temp_table

def _check_permissions(*args, **kwargs):

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

    res = DumbOrderedDict(sorted(res.iteritems(), lambda a,b: cmp(a[1], b[1])))

    return res, restricted

def _dummy_check_permissions(self, rqlst):

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

def _init_temp_table(self, table, selection, solution):

    if self.tablesinorder is None:

        tablesinorder = self.tablesinorder = {}

    else:

        tablesinorder = self.tablesinorder

    if not table in tablesinorder:

        tablesinorder[table] = 'table%s' % len(tablesinorder)

    return _orig_init_temp_table(self, table, selection, solution)

from cubicweb.server import rqlannotation

_orig_select_principal = rqlannotation._select_principal

def _select_principal(scope, relations):

try:

    from cubicweb.server.msplanner import PartPlanInformation

except ImportError:

    class PartPlanInformation(object):

        def merge_input_maps(*args):

            pass

        def _choose_var(self, sourcevars):

            pass    

_orig_merge_input_maps = PartPlanInformation.merge_input_maps

_orig_choose_var = PartPlanInformation._choose_var

def _merge_input_maps(*args):

    return sorted(_orig_merge_input_maps(*args))

def _choose_var(self, sourcevars):

    # predictable order for test purpose

    def get_key(x):

        try:

            # variable

            return x.name

        except AttributeError:

            try:

                # relation

                return x.r_type

            except AttributeError:

                # const

                return x.value

    varsinorder = sorted(sourcevars, key=get_key)

    if len(self._sourcesvars) > 1:

        for var in varsinorder:

            if not var.scope is self.rqlst:

                return var, sourcevars.pop(var)

    else:

        for var in varsinorder:

            if var.scope is self.rqlst:

                return var, sourcevars.pop(var)

    var = varsinorder[0]

    return var, sourcevars.pop(var)

def do_monkey_patch():

    RQLRewriter.insert_snippets = _insert_snippets

    RQLRewriter.build_variantes = _build_variantes

    ExecutionPlan._check_permissions = _check_permissions

    ExecutionPlan.tablesinorder = None

    ExecutionPlan.init_temp_table = _init_temp_table

    PartPlanInformation.merge_input_maps = _merge_input_maps

    PartPlanInformation._choose_var = _choose_var

def undo_monkey_patch():

    RQLRewriter.insert_snippets = _orig_insert_snippets

    RQLRewriter.build_variantes = _orig_build_variantes

    ExecutionPlan._check_permissions = _orig_check_permissions

    ExecutionPlan.init_temp_table = _orig_init_temp_table

    PartPlanInformation.merge_input_maps = _orig_merge_input_maps

    PartPlanInformation._choose_var = _orig_choose_var