"""this module contains base classes for web tests

:organization: Logilab

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

"""

__docformat__ = "restructuredtext en"

import sys

from math import log

from logilab.common.debugger import Debugger

from logilab.common.testlib import InnerTest

from logilab.common.pytest import nocoverage

from cubicweb.devtools import VIEW_VALIDATORS

from cubicweb.devtools.apptest import EnvBasedTC

from cubicweb.devtools._apptest import unprotected_entities, SYSTEM_RELATIONS

from cubicweb.devtools.htmlparser import DTDValidator, SaxOnlyValidator, HTMLValidator

from cubicweb.devtools.fill import insert_entity_queries, make_relations_queries

from cubicweb.sobjects.notification import NotificationView

from cubicweb.vregistry import NoSelectableObject

## TODO ###############

# creation tests: make sure an entity was actually created

# Existing Test Environment

class CubicWebDebugger(Debugger):

    def do_view(self, arg):

        import webbrowser

        data = self._getval(arg)

        file('/tmp/toto.html', 'w').write(data)

        webbrowser.open('file:///tmp/toto.html')

def how_many_dict(schema, cursor, how_many, skip):

    """compute how many entities by type we need to be able to satisfy relations

    cardinality

    """

    # compute how many entities by type we need to be able to satisfy relation constraint

    relmap = {}

    for rschema in schema.relations():

        if rschema.meta or rschema.is_final(): # skip meta relations

            continue

        for subj, obj in rschema.iter_rdefs():

            card = rschema.rproperty(subj, obj, 'cardinality')

            if card[0] in '1?' and len(rschema.subjects(obj)) == 1:

                relmap.setdefault((rschema, subj), []).append(str(obj))

            if card[1] in '1?' and len(rschema.objects(subj)) == 1:

                relmap.setdefault((rschema, obj), []).append(str(subj))

    unprotected = unprotected_entities(schema)

    for etype in skip:

        unprotected.add(etype)

    howmanydict = {}

    for etype in unprotected_entities(schema, strict=True):

        howmanydict[str(etype)] = cursor.execute('Any COUNT(X) WHERE X is %s' % etype)[0][0]

        if etype in unprotected:

            howmanydict[str(etype)] += how_many

    for (rschema, etype), targets in relmap.iteritems():

        # XXX should 1. check no cycle 2. propagate changes

        relfactor = sum(howmanydict[e] for e in targets)

        howmanydict[str(etype)] = max(relfactor, howmanydict[etype])

    return howmanydict

def line_context_filter(line_no, center, before=3, after=None):

    """return true if line are in context

    if after is None: after = before"""

    if after is None:

        after = before

    return center - before <= line_no <= center + after

## base webtest class #########################################################

VALMAP = {None: None, 'dtd': DTDValidator, 'xml': SaxOnlyValidator}

class WebTest(EnvBasedTC):

    """base class for web tests"""

    __abstract__ = True

    pdbclass = CubicWebDebugger

    # this is a hook to be able to define a list of rql queries

    # that are application dependent and cannot be guessed automatically

    application_rql = []

    # validators are used to validate (XML, DTD, whatever) view's content

    # validators availables are :

    #  DTDValidator : validates XML + declared DTD

    #  SaxOnlyValidator : guarantees XML is well formed

    #  None : do not try to validate anything

    # validators used must be imported from from.devtools.htmlparser

    content_type_validators = {

        # maps MIME type : validator name

        #

        # do not set html validators here, we need HTMLValidator for html

        # snippets

        #'text/html': DTDValidator,

        #'application/xhtml+xml': DTDValidator,

        'application/xml': SaxOnlyValidator,

        'text/xml': SaxOnlyValidator,

        'text/plain': None,

        'text/comma-separated-values': None,

        'text/x-vcard': None,

        'text/calendar': None,

        'application/json': None,

        'image/png': None,

        }

    # maps vid : validator name (override content_type_validators)

    vid_validators = dict((vid, VALMAP[valkey])

                          for vid, valkey in VIEW_VALIDATORS.iteritems())

    no_auto_populate = ()

    ignored_relations = ()

    def custom_populate(self, how_many, cursor):

        pass

    def post_populate(self, cursor):

        pass

    @nocoverage

    def auto_populate(self, how_many):

        """this method populates the database with `how_many` entities

        of each possible type. It also inserts random relations between them

        """

        cu = self.cursor()

        self.custom_populate(how_many, cu)

        vreg = self.vreg

        howmanydict = how_many_dict(self.schema, cu, how_many, self.no_auto_populate)

        for etype in unprotected_entities(self.schema):

            if etype in self.no_auto_populate:

                continue

            nb = howmanydict.get(etype, how_many)

            for rql, args in insert_entity_queries(etype, self.schema, vreg, nb):

                cu.execute(rql, args)

        edict = {}

        for etype in unprotected_entities(self.schema, strict=True):

            rset = cu.execute('%s X' % etype)

            edict[str(etype)] = set(row[0] for row in rset.rows)

        existingrels = {}

        ignored_relations = SYSTEM_RELATIONS + self.ignored_relations

        for rschema in self.schema.relations():

            if rschema.is_final() or rschema in ignored_relations:

                continue

            rset = cu.execute('DISTINCT Any X,Y WHERE X %s Y' % rschema)

            existingrels.setdefault(rschema.type, set()).update((x, y) for x, y in rset)

        q = make_relations_queries(self.schema, edict, cu, ignored_relations,

                                   existingrels=existingrels)

        for rql, args in q:

            cu.execute(rql, args)

        self.post_populate(cu)

        self.commit()

    @nocoverage

    def _check_html(self, output, view, template='main-template'):

        """raises an exception if the HTML is invalid"""

        try:

            validatorclass = self.vid_validators[view.id]

        except KeyError:

            if template is None:

                default_validator = HTMLValidator

            else:

                default_validator = DTDValidator

            validatorclass = self.content_type_validators.get(view.content_type,

                                                              default_validator)

        if validatorclass is None:

            return None

        validator = validatorclass()

        return validator.parse_string(output.strip())

    def view(self, vid, rset, req=None, template='main-template', **kwargs):

        """This method tests the view `vid` on `rset` using `template`

        If no error occured while rendering the view, the HTML is analyzed

        and parsed.

        :returns: an instance of `cubicweb.devtools.htmlparser.PageInfo`

                  encapsulation the generated HTML

        """

        req = req or rset and rset.req or self.request()

        # print "testing ", vid,

        # if rset:

        #     print rset, len(rset), id(rset)

        # else:

        #     print

        req.form['vid'] = vid

        view = self.vreg.select_view(vid, req, rset, **kwargs)

        # set explicit test description

        if rset is not None:

            self.set_description("testing %s, mod=%s (%s)" % (vid, view.__module__, rset.printable_rql()))

        else:

            self.set_description("testing %s, mod=%s (no rset)" % (vid, view.__module__))

        if template is None: # raw view testing, no template

            viewfunc = view.render

        else:

            templateview = self.vreg.select_view(template, req, rset, view=view, **kwargs)

            kwargs['view'] = view

            viewfunc = lambda **k: self.vreg.main_template(req, template, **kwargs)

        return self._test_view(viewfunc, view, template, kwargs)

    def _test_view(self, viewfunc, view, template='main-template', kwargs={}):

        """this method does the actual call to the view

        If no error occured while rendering the view, the HTML is analyzed

        and parsed.

        :returns: an instance of `cubicweb.devtools.htmlparser.PageInfo`

                  encapsulation the generated HTML

        """

        output = None

        try:

            output = viewfunc(**kwargs)

            return self._check_html(output, view, template)

        except (SystemExit, KeyboardInterrupt):

            raise

        except:

            # hijack exception: generative tests stop when the exception

            # is not an AssertionError

            klass, exc, tcbk = sys.exc_info()

            try:

                msg = '[%s in %s] %s' % (klass, view.id, exc)

            except:

                msg = '[%s in %s] undisplayable exception' % (klass, view.id)

            if output is not None:

                position = getattr(exc, "position", (0,))[0]

                if position:

                    # define filter

                    output = output.splitlines()

                    width = int(log(len(output), 10)) + 1

                    line_template = " %" + ("%i" % width) + "i: %s"

                    # XXX no need to iterate the whole file except to get

                    # the line number

                    output = '\n'.join(line_template % (idx + 1, line)

                                for idx, line in enumerate(output)

                                if line_context_filter(idx+1, position))

                    msg += '\nfor output:\n%s' % output

            raise AssertionError, msg, tcbk

    def to_test_etypes(self):

        return unprotected_entities(self.schema, strict=True)

    def iter_automatic_rsets(self, limit=10):

        """generates basic resultsets for each entity type"""

        etypes = self.to_test_etypes()

        for etype in etypes:

            yield self.execute('Any X LIMIT %s WHERE X is %s' % (limit, etype))

        etype1 = etypes.pop()

        try:

            etype2 = etypes.pop()

        except KeyError:

            etype2 = etype1

        # test a mixed query (DISTINCT/GROUP to avoid getting duplicate

        # X which make muledit view failing for instance (html validation fails

        # because of some duplicate "id" attributes)

        yield self.execute('DISTINCT Any X, MAX(Y) GROUPBY X WHERE X is %s, Y is %s' % (etype1, etype2))

        # test some application-specific queries if defined

        for rql in self.application_rql:

            yield self.execute(rql)

    def list_views_for(self, rset):

        """returns the list of views that can be applied on `rset`"""

        req = rset.req

        only_once_vids = ('primary', 'secondary', 'text')

        req.data['ex'] = ValueError("whatever")

        for vid, views in self.vreg.registry('views').items():

            if vid[0] == '_':

                continue

            if rset.rowcount > 1 and vid in only_once_vids:

                continue

            views = [view for view in views

                     if view.category != 'startupview'

                     and not issubclass(view, NotificationView)]

            if views:

                try:

                    view = self.vreg.select(views, req, rset)

                    if view.linkable():

                        yield view

                    else:

                        not_selected(self.vreg, view)

                    # else the view is expected to be used as subview and should

                    # not be tested directly

                except NoSelectableObject:

                    continue

    def list_actions_for(self, rset):

        """returns the list of actions that can be applied on `rset`"""

        req = rset.req

        for action in self.vreg.possible_objects('actions', req, rset):

            yield action

    def list_boxes_for(self, rset):

        """returns the list of boxes that can be applied on `rset`"""

        req = rset.req

        for box in self.vreg.possible_objects('boxes', req, rset):

            yield box

    def list_startup_views(self):

        """returns the list of startup views"""

        req = self.request()

        for view in self.vreg.possible_views(req, None):

            if view.category == 'startupview':

                yield view.id

            else:

                not_selected(self.vreg, view)

    def _test_everything_for(self, rset):

        """this method tries to find everything that can be tested

        for `rset` and yields a callable test (as needed in generative tests)

        """

        propdefs = self.vreg['propertydefs']

        # make all components visible

        for k, v in propdefs.items():

            if k.endswith('visible') and not v['default']:

                propdefs[k]['default'] = True

        for view in self.list_views_for(rset):

            backup_rset = rset._prepare_copy(rset.rows, rset.description)

            yield InnerTest(self._testname(rset, view.id, 'view'),

                            self.view, view.id, rset,

                            rset.req.reset_headers(), 'main-template')

            # We have to do this because some views modify the

            # resultset's syntax tree

            rset = backup_rset

        for action in self.list_actions_for(rset):

            yield InnerTest(self._testname(rset, action.id, 'action'), action.url)

        for box in self.list_boxes_for(rset):

            yield InnerTest(self._testname(rset, box.id, 'box'), box.render)

    @staticmethod

    def _testname(rset, objid, objtype):

        return '%s_%s_%s' % ('_'.join(rset.column_types(0)), objid, objtype)

class AutomaticWebTest(WebTest):

    """import this if you wan automatic tests to be ran"""

    ## one each

    def test_one_each_config(self):

        self.auto_populate(1)

        for rset in self.iter_automatic_rsets(limit=1):

            for testargs in self._test_everything_for(rset):

                yield testargs

    ## ten each

    def test_ten_each_config(self):

        self.auto_populate(10)

        for rset in self.iter_automatic_rsets(limit=10):

            for testargs in self._test_everything_for(rset):

                yield testargs

    ## startup views

    def test_startup_views(self):

        for vid in self.list_startup_views():

            req = self.request()

            yield self.view, vid, None, req

class RealDBTest(WebTest):

    def iter_individual_rsets(self, etypes=None, limit=None):

        etypes = etypes or unprotected_entities(self.schema, strict=True)

        for etype in etypes:

            rset = self.execute('Any X WHERE X is %s' % etype)

            for row in xrange(len(rset)):

                if limit and row > limit:

                    break

                rset2 = rset.limit(limit=1, offset=row)

                yield rset2

def not_selected(vreg, vobject):

    try:

        vreg._selected[vobject.__class__] -= 1

    except (KeyError, AttributeError):

        pass

def vreg_instrumentize(testclass):

    from cubicweb.devtools.apptest import TestEnvironment