# -*- coding: utf-8 -*-

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

object to handle publication.

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

from smtplib import SMTP

import simplejson

from mx.DateTime.Parser import DateFromString

from logilab.common.decorators import cached

from cubicweb import NoSelectableObject, ValidationError, typed_eid

from cubicweb.common.selectors import yes

from cubicweb.common.mail import format_mail

from cubicweb.common.view import STRICT_DOCTYPE, CW_XHTML_EXTENSIONS

from cubicweb.web import ExplicitLogin, Redirect, RemoteCallFailed

from cubicweb.web.controller import Controller

from cubicweb.web.views import vid_from_rset

try:

    from cubicweb.web.facet import (FilterRQLBuilder, get_facet,

                                    prepare_facets_rqlst)

    HAS_SEARCH_RESTRICTION = True

except ImportError: # gae

    HAS_SEARCH_RESTRICTION = False

class LoginController(Controller):

    id = 'login'

    def publish(self, rset=None):

        """log in the application"""

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

            # HTTP authentication

            raise ExplicitLogin()

        else:

            # Cookie authentication

            return self.appli.need_login_content(self.req)

class LogoutController(Controller):

    id = 'logout'

    def publish(self, rset=None):

        """logout from the application"""

        return self.appli.session_handler.logout(self.req)

class ViewController(Controller):

    id = 'view'

    template = 'main'

    def publish(self, rset=None):

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

        self.req.update_search_state()

        template = self.req.property_value('ui.main-template')

        if template not in self.vreg.registry('templates') :

            template = self.template

        return self.vreg.main_template(self.req, template, rset=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.req

        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)}, ('x', 'y')) 

class FormValidatorController(Controller):

    id = 'validateform'

    def publish(self, rset=None):

        vreg = self.vreg

        try:

            ctrl = vreg.select(vreg.registry_objects('controllers', 'edit'),

                               req=self.req, appli=self.appli)

        except NoSelectableObject:

            status, args = (False, {None: self.req._('not authorized')})

        else:

            try:

                ctrl.publish(None, fromjson=True)

            except ValidationError, err:

                status, args = self.validation_error(err)

            except Redirect, err:

                try:

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

                except ValidationError, err:

                    status, args = self.validation_error(err)

                else:

                    status, args = (True, err.location)

            except Exception, err:

                self.req.cnx.rollback()

                self.exception('unexpected error in validateform')

                try:

                    status, args = (False, self.req._(unicode(err)))

                except UnicodeError:

                    status, args = (False, repr(err))

            else:

                status, args = (False, '???')

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

        jsarg = simplejson.dumps( (status, args) )

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

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

</script>""" %  simplejson.dumps( (status, args) )

    def validation_error(self, err):

        self.req.cnx.rollback()

        try:

            eid = err.entity.eid

        except AttributeError:

            eid = err.entity

        return (False, (eid, err.errors))

def xmlize(source):

    head = u'<?xml version="1.0"?>\n' + STRICT_DOCTYPE % CW_XHTML_EXTENSIONS

    return head + u'<div xmlns="http://www.w3.org/1999/xhtml" xmlns:cubicweb="http://www.logilab.org/2008/cubicweb">%s</div>' % source.strip()

def jsonize(func):

    """sets correct content_type and calls `simplejson.dumps` on results

    """

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

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

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

        return simplejson.dumps(result)

    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.req.get_session_data(self.req.pageid)

        if data is None:

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

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

    return wrapper

class JSonController(Controller):

    id = 'json'

    template = 'main'

    def publish(self, rset=None):

        mode = self.req.form.get('mode', 'html')

        self.req.pageid = self.req.form.get('pageid')

        try:

            func = getattr(self, '%s_exec' % mode)

        except AttributeError, ex:

            self.error('json controller got an unknown mode %r', mode)

            self.error('\t%s', ex)

            result = u''

        else:

            try:

                result = func(rset)

            except RemoteCallFailed:

                raise

            except Exception, ex:

                self.exception('an exception occured on json request(rset=%s): %s',

                               rset, ex)

                raise RemoteCallFailed(repr(ex))

        return result.encode(self.req.encoding)

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

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

        if rocheck:

            self.ensure_ro_rql(rql)

        try:

            return self.req.execute(rql, args, eidkey)

        except Exception, ex:

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

            return None

        return None

    @jsonize

    def json_exec(self, rset=None):

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

        rql = self.req.form.get('rql')

        if rset is None and rql:

            rset = self._exec(rql)

        return rset and rset.rows or []

    def _set_content_type(self, vobj, data):

        """sets req's content type according to vobj's content type

        (and xmlize data if needed)

        """

        content_type = vobj.content_type

        if content_type == 'application/xhtml+xml':

            self.req.set_content_type(content_type)

            return xmlize(data)

        return data

    def html_exec(self, rset=None):

        """html mode: execute query and return the view as HTML"""

        req = self.req

        rql = req.form.get('rql')

        if rset is None and rql:

            rset = self._exec(rql)

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

        try:

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

        except NoSelectableObject:

            vid = req.form.get('fallbackvid', 'noresult')

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

        divid = req.form.get('divid', 'pageContent')

        # we need to call pagination before with the stream set

        stream = view.set_stream()

        if req.form.get('paginate'):

            if divid == 'pageContent':

                # mimick main template behaviour

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

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

                if vtitle:

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

            view.pagination(req, rset, view.w, not view.need_navigation)

            if divid == 'pageContent':

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

        view.dispatch()

        if req.form.get('paginate') and divid == 'pageContent':

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

        source = stream.getvalue()

        return self._set_content_type(view, source)

    def rawremote_exec(self, rset=None):

        """like remote_exec but doesn't change content type"""

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

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

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

            args = (args,)

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

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

        try:

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

        except AttributeError:

            self.exception('rawremote_exec fname=%s', fname)

            return u""

        return func(*args)

    remote_exec = jsonize(rawremote_exec)

    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'):

                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 js_validate_form(self, action, names, values):

        # XXX this method (and correspoding js calls) should use the new

        #     `RemoteCallFailed` mechansim

        self.req.form = self._rebuild_posted_form(names, values, action)

        vreg = self.vreg

        try:

            ctrl = vreg.select(vreg.registry_objects('controllers', 'edit'),

                               req=self.req)

        except NoSelectableObject:

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

        try:

            ctrl.publish(None, fromjson=True)

        except ValidationError, err:

            self.req.cnx.rollback()

            if not err.entity or isinstance(err.entity, (long, int)):

                eid = err.entity

            else:

                eid = err.entity.eid

            return (False, (eid, err.errors))

        except Redirect, err:

            return (True, err.location)

        except Exception, err:

            self.req.cnx.rollback()

            self.exception('unexpected error in js_validateform')

            return (False, self.req._(str(err)))

        return (False, '???')

    def js_edit_field(self, action, names, values, rtype, eid):

        success, args = self.js_validate_form(action, names, values)

        if success:

            rset = self.req.execute('Any X,N WHERE X eid %%(x)s, X %s N' % rtype,

                                    {'x': eid}, 'x')

            entity = rset.get_entity(0, 0)

            return (success, args, entity.printable_value(rtype))

        else:

            return (success, args, None)

    def js_rql(self, rql):

        rset = self._exec(rql)

        return rset and rset.rows or []

    def js_i18n(self, msgids):

        """returns the translation of `msgid`"""

        return [self.req._(msgid) for msgid in msgids]

    def js_format_date(self, strdate):

        """returns the formatted date for `msgid`"""

        date = DateFromString(strdate)

        return self.format_date(date)

    def js_external_resource(self, resource):

        """returns the URL of the external resource named `resource`"""

        return self.req.external_resource(resource)

    def js_prop_widget(self, propkey, varname, tabindex=None):

        """specific method for EProperty handling"""

        w = self.vreg.property_value_widget(propkey, req=self.req)

        entity = self.vreg.etype_class('EProperty')(self.req, None, None)

        entity.eid = varname

        self.req.form['value'] = self.vreg.property_info(propkey)['default']

        return w.edit_render(entity, tabindex, includehelp=True)

    def js_component(self, compid, rql, registry='components', extraargs=None):

        if rql:

            rset = self._exec(rql)

        else:

            rset = None

        comp = self.vreg.select_object(registry, compid, self.req, rset)

        if extraargs is None:

            extraargs = {}

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

            extraargs = dict((str(key), value)

                             for key, value in extraargs.items())

        extraargs = extraargs or {}

        return self._set_content_type(comp, comp.dispatch(**extraargs))

    @check_pageid

    def js_user_callback(self, cbname):

        page_data = self.req.get_session_data(self.req.pageid, {})

        try:

            cb = page_data[cbname]

        except KeyError:

            return None

        return cb(self.req)

    def js_unregister_user_callback(self, cbname):

        self.req.unregister_callback(self.req.pageid, cbname)

    def js_unload_page_data(self):

        self.req.del_session_data(self.req.pageid)

    def js_cancel_edition(self, errorurl):

        """cancelling edition from javascript

        We need to clear associated req's data :

          - errorurl

          - pending insertions / deletions