# copyright 2003-2013 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/>.

"""Set of base controllers, which are directly plugged into the application

object to handle publication.

"""

from cubicweb import (NoSelectableObject, ObjectNotFound, ValidationError,

                      AuthenticationError, UndoTransactionException,

                      Forbidden)

from cubicweb.utils import json_dumps

from cubicweb.predicates import (authenticated_user, anonymous_user,

                                match_form_params)

from cubicweb.web import Redirect

from cubicweb.web.controller import Controller

from cubicweb.web.views import vid_from_rset

class LoginController(Controller):

    __regid__ = 'login'

    __select__ = anonymous_user()

    def publish(self, rset=None):

        """log in the instance"""

        if self._cw.vreg.config['auth-mode'] == 'http':

            # HTTP authentication

            raise AuthenticationError()

        else:

            # Cookie authentication

            return self.appli.need_login_content(self._cw)

class LoginControllerForAuthed(Controller):

    __regid__ = 'login'

    __select__ = ~anonymous_user()

    def publish(self, rset=None):

        """log in the instance"""

        path = self._cw.form.get('postlogin_path', '')

        # Redirect expects a URL, not a path. Also path may contain a query

        # string, hence should not be given to _cw.build_url()

        raise Redirect(self._cw.base_url() + path)

class LogoutController(Controller):

    __regid__ = 'logout'

    def publish(self, rset=None):

        """logout from the instance"""

        return self.appli.session_handler.logout(self._cw, self.goto_url())

    def goto_url(self):

        # * in http auth mode, url will be ignored

        # * in cookie mode redirecting to the index view is enough : either

        #   anonymous connection is allowed and the page will be displayed or

        #   we'll be redirected to the login form

        msg = self._cw._('you have been logged out')

        return self._cw.build_url('view', vid='loggedout')

class ViewController(Controller):

    """standard entry point :

    - build result set

    - select and call main template

    """

    __regid__ = 'view'

    template = 'main-template'

    def publish(self, rset=None):

        """publish a request, returning an encoded string"""

        view, rset = self._select_view_and_rset(rset)

        view.set_http_cache_headers()

        if self._cw.is_client_cache_valid():

            return b''

        template = self.appli.main_template_id(self._cw)

        return self._cw.vreg['views'].main_template(self._cw, template,

                                                    rset=rset, view=view)

    def _select_view_and_rset(self, rset):

        req = self._cw

        if rset is None and not hasattr(req, '_rql_processed'):

            req._rql_processed = True

            if req.cnx:

                rset = self.process_rql()

            else:

                rset = None

        vid = req.form.get('vid') or vid_from_rset(req, rset, self._cw.vreg.schema)

        try:

            view = self._cw.vreg['views'].select(vid, req, rset=rset)

        except ObjectNotFound:

            self.warning("the view %s could not be found", vid)

            req.set_message(req._("The view %s could not be found") % vid)

            vid = vid_from_rset(req, rset, self._cw.vreg.schema)

            view = self._cw.vreg['views'].select(vid, req, rset=rset)

        except NoSelectableObject:

            if rset:

                req.set_message(req._("The view %s can not be applied to this query") % vid)

            else:

                req.set_message(req._("You have no access to this view or it can not "

                                      "be used to display the current data."))

            vid = req.form.get('fallbackvid') or vid_from_rset(req, rset, req.vreg.schema)

            view = req.vreg['views'].select(vid, req, rset=rset)

        return view, rset

    def execute_linkto(self, eid=None):

        """XXX __linkto parameter may cause security issue

        defined here since custom application controller inheriting from this

        one use this method?

        """

        req = self._cw

        if not '__linkto' in req.form:

            return

        if eid is None:

            eid = int(req.form['eid'])

        for linkto in req.list_form_param('__linkto', pop=True):

            rtype, eids, target = linkto.split(':')

            assert target in ('subject', 'object')

            eids = eids.split('_')

            if target == 'subject':

                rql = 'SET X %s Y WHERE X eid %%(x)s, Y eid %%(y)s' % rtype

            else:

                rql = 'SET Y %s X WHERE X eid %%(x)s, Y eid %%(y)s' % rtype

            for teid in eids:

                req.execute(rql, {'x': eid, 'y': int(teid)})

def _validation_error(req, ex):

    req.cnx.rollback()

    ex.translate(req._) # translate messages using ui language

    # XXX necessary to remove existant validation error?

    # imo (syt), it's not necessary

    req.session.data.pop(req.form.get('__errorurl'), None)

    foreid = ex.entity

    eidmap = req.data.get('eidmap', {})

    for var, eid in eidmap.items():

        if foreid == eid:

            foreid = var

            break

    return (foreid, ex.errors)

def _validate_form(req, vreg):

    # XXX should use the `RemoteCallFailed` mechanism

    try:

        ctrl = vreg['controllers'].select('edit', req=req)

    except NoSelectableObject:

        return (False, {None: req._('not authorized')}, None)

    try:

        ctrl.publish(None)

    except ValidationError as ex:

        return (False, _validation_error(req, ex), ctrl._edited_entity)

    except Redirect as ex:

        try:

            txuuid = req.cnx.commit() # ValidationError may be raised on commit

        except ValidationError as ex:

            return (False, _validation_error(req, ex), ctrl._edited_entity)

        except Exception as ex:

            req.cnx.rollback()

            req.exception('unexpected error while validating form')

            return (False, str(ex).decode('utf-8'), ctrl._edited_entity)

        else:

            if txuuid is not None:

                req.data['last_undoable_transaction'] = txuuid

            # complete entity: it can be used in js callbacks where we might

            # want every possible information

            if ctrl._edited_entity:

                ctrl._edited_entity.complete()

            return (True, ex.location, ctrl._edited_entity)

    except Exception as ex:

        req.cnx.rollback()

        req.exception('unexpected error while validating form')

    return (False, '???', None)

class FormValidatorController(Controller):

    __regid__ = 'validateform'

    def response(self, domid, status, args, entity):

        callback = str(self._cw.form.get('__onsuccess', 'null'))

        errback = str(self._cw.form.get('__onfailure', 'null'))

        cbargs = str(self._cw.form.get('__cbargs', 'null'))

        self._cw.set_content_type('text/html')

        jsargs = json_dumps((status, args, entity))

        return """<script type="text/javascript">

 window.parent.handleFormValidationResponse('%s', %s, %s, %s, %s);

</script>""" %  (domid, callback, errback, jsargs, cbargs)

    def publish(self, rset=None):

        self._cw.ajax_request = True

        # XXX unclear why we have a separated controller here vs

        # js_validate_form on the json controller

        status, args, entity = _validate_form(self._cw, self._cw.vreg)

        domid = self._cw.form.get('__domid', 'entityForm')

        return self.response(domid, status, args, entity).encode(self._cw.encoding)

class MailBugReportController(Controller):

    __regid__ = 'reportbug'

    __select__ = match_form_params('description')

    def publish(self, rset=None):

        req = self._cw

        desc = req.form['description']

        # The description is generated and signed by cubicweb itself, check

        # description's signature so we don't want to send spam here

        sign = req.form.get('__signature', '')

        if not (sign and req.vreg.config.check_text_sign(desc, sign)):

            raise Forbidden('Invalid content')

        self.sendmail(req.vreg.config['submit-mail'],

                      req._('%s error report') % req.vreg.config.appid,

                      desc)

        raise Redirect(req.build_url(__message=req._('bug report sent')))

class UndoController(Controller):

    __regid__ = 'undo'

    __select__ = authenticated_user() & match_form_params('txuuid')

    def publish(self, rset=None):

        txuuid = self._cw.form['txuuid']

        try:

            self._cw.cnx.undo_transaction(txuuid)

        except UndoTransactionException as exc:

            errors = exc.errors

            #This will cause a rollback in main_publish

            raise ValidationError(None, {None: '\n'.join(errors)})

        else :

            self.redirect() # Will raise Redirect

    def redirect(self, msg=None):

        req = self._cw

        msg = msg or req._("transaction undone")

        self._redirect({'_cwmsgid': req.set_redirect_message(msg)})