# copyright 2003-2011 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.

"""

__docformat__ = "restructuredtext en"

_ = unicode

from logilab.common.date import strptime

from logilab.common.deprecation import deprecated

from cubicweb import (NoSelectableObject, ObjectNotFound, ValidationError,

                      AuthenticationError, typed_eid)

from cubicweb.utils import UStringIO, json, json_dumps

from cubicweb.uilib import exc_message

from cubicweb.selectors import authenticated_user, anonymous_user, match_form_params

from cubicweb.mail import format_mail

from cubicweb.web import Redirect, RemoteCallFailed, DirectResponse, facet

from cubicweb.web.controller import Controller

from cubicweb.web.views import vid_from_rset, formrenderers

def jsonize(func):

    """decorator to sets correct content_type and calls `json_dumps` on

    results

    """

    def wrapper(self, *args, **kwargs):

        self._cw.set_content_type('application/json')

        return json_dumps(func(self, *args, **kwargs))

    wrapper.__name__ = func.__name__

    return wrapper

def xhtmlize(func):

    """decorator to sets correct content_type and calls `xmlize` on results"""

    def wrapper(self, *args, **kwargs):

        self._cw.set_content_type(self._cw.html_content_type())

        result = func(self, *args, **kwargs)

        return ''.join((self._cw.document_surrounding_div(), result.strip(),

                        u'</div>'))

    wrapper.__name__ = func.__name__

    return wrapper

def check_pageid(func):

    """decorator which checks the given pageid is found in the

    user's session data

    """

    def wrapper(self, *args, **kwargs):

        data = self._cw.session.data.get(self._cw.pageid)

        if data is None:

            raise RemoteCallFailed(self._cw._('pageid-not-found'))

        return func(self, *args, **kwargs)

    return wrapper

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 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')

        # force base_url so on dual http/https configuration, we generate an url

        # on the http version of the site

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

                                  base_url=self._cw.vreg.config['base-url'])

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)

        self.add_to_breadcrumbs(view)

        self.validate_cache(view)

        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 add_to_breadcrumbs(self, view):

        # update breadcrumbs **before** validating cache, unless the view

        # specifies explicitly it should not be added to breadcrumb or the

        # view is a binary view

        if view.add_to_breadcrumbs and not view.binary:

            self._cw.update_breadcrumbs()

    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 = typed_eid(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': typed_eid(teid)})

def _validation_error(req, ex):

    req.cnx.rollback()

    # 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, ex:

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

    except Redirect, ex:

        try:

            req.cnx.commit() # ValidationError may be raise on commit

        except ValidationError, ex:

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

        except Exception, ex:

            req.cnx.rollback()

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

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

        else:

            # 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, ex:

        req.cnx.rollback()

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

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

    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.json_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').encode(

            self._cw.encoding)

        return self.response(domid, status, args, entity)

def optional_kwargs(extraargs):

    if extraargs is None:

        return {}

    # we receive unicode keys which is not supported by the **syntax

    return dict((str(key), value) for key, value in extraargs.iteritems())

class JSonController(Controller):

    __regid__ = 'json'

    def publish(self, rset=None):

        """call js_* methods. Expected form keys:

        :fname: the method name without the js_ prefix

        :args: arguments list (json)

        note: it's the responsability of js_* methods to set the correct

        response content type

        """

        self._cw.json_request = True

        try:

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

            func = getattr(self, 'js_%s' % fname)

        except KeyError:

            raise RemoteCallFailed('no method specified')

        except AttributeError:

            raise RemoteCallFailed('no %s method' % fname)

        # no <arg> attribute means the callback takes no argument

        args = self._cw.form.get('arg', ())

        if not isinstance(args, (list, tuple)):

            args = (args,)

        try:

            args = [json.loads(arg) for arg in args]

        except ValueError, exc:

            self.exception('error while decoding json arguments for js_%s: %s (err: %s)',

                           fname, args, exc)

            raise RemoteCallFailed(exc_message(exc, self._cw.encoding))

        try:

            result = func(*args)

        except (RemoteCallFailed, DirectResponse):

            raise

        except Exception, exc:

            self.exception('an exception occurred while calling js_%s(%s): %s',

                           fname, args, exc)

            raise RemoteCallFailed(exc_message(exc, self._cw.encoding))

        if result is None:

            return ''

        # get unicode on @htmlize methods, encoded string on @jsonize methods

        elif isinstance(result, unicode):

            return result.encode(self._cw.encoding)

        return result

    def _rebuild_posted_form(self, names, values, action=None):

        form = {}

        for name, value in zip(names, values):

            # remove possible __action_xxx inputs

            if name.startswith('__action'):

                if action is None:

                    # strip '__action_' to get the actual action name

                    action = name[9:]

                continue

            # form.setdefault(name, []).append(value)

            if name in form:

                curvalue = form[name]

                if isinstance(curvalue, list):

                    curvalue.append(value)

                else:

                    form[name] = [curvalue, value]

            else:

                form[name] = value

        # simulate click on __action_%s button to help the controller

        if action:

            form['__action_%s' % action] = u'whatever'

        return form

    def _exec(self, rql, args=None, rocheck=True):

        """json mode: execute RQL and return resultset as json"""

        rql = rql.strip()

        if rql.startswith('rql:'):

            rql = rql[4:]

        if rocheck:

            self._cw.ensure_ro_rql(rql)

        try:

            return self._cw.execute(rql, args)

        except Exception, ex:

            self.exception("error in _exec(rql=%s): %s", rql, ex)

            return None

        return None

    def _call_view(self, view, paginate=False, **kwargs):

        divid = self._cw.form.get('divid')

        # we need to call pagination before with the stream set

        try:

            stream = view.set_stream()

        except AttributeError:

            stream = UStringIO()

            kwargs['w'] = stream.write

            assert not paginate

        if divid == 'pageContent':

            # ensure divid isn't reused by the view (e.g. table view)

            del self._cw.form['divid']

            # mimick main template behaviour

            stream.write(u'<div id="pageContent">')

            vtitle = self._cw.form.get('vtitle')

            if vtitle:

                stream.write(u'<h1 class="vtitle">%s</h1>\n' % vtitle)

            paginate = True

        if paginate and not view.handle_pagination:

            view.paginate()

        if divid == 'pageContent':

            stream.write(u'<div id="contentmain">')

        view.render(**kwargs)

        extresources = self._cw.html_headers.getvalue(skiphead=True)

        if extresources:

            stream.write(u'<div class="ajaxHtmlHead">\n') # XXX use a widget ?

            stream.write(extresources)

            stream.write(u'</div>\n')