"""Mass mailing form views

:organization: Logilab

:copyright: 2007-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

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

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

_ = unicode

import operator

from cubicweb.interfaces import IEmailable

from cubicweb.selectors import implements, match_user_groups

from cubicweb.view import EntityView

from cubicweb.web import stdmsgs

from cubicweb.web.action import Action

from cubicweb.web.form import FormViewMixIn

from cubicweb.web.formfields import StringField

from cubicweb.web.formwidgets import CheckBox, TextInput, AjaxWidget, ImgButton

from cubicweb.web.views import forms, formrenderers

class SendEmailAction(Action):

    id = 'sendemail'

    # XXX should check email is set as well

    __select__ = implements(IEmailable) & match_user_groups('managers', 'users')

    title = _('send email')

    category = 'mainactions'

    def url(self):

        params = {'vid': 'massmailing', '__force_display': 1}

        if self.req.form.has_key('rql'):

            params['rql'] = self.req.form['rql']

        return self.build_url(self.req.relative_path(includeparams=False),

                              **params)

class MassMailingForm(forms.FieldsForm):

    id = 'massmailing'

    sender = StringField(widget=TextInput({'disabled': 'disabled'}), label=_('From:'))

    recipient = StringField(widget=CheckBox(), label=_('Recipients:'))

    subject = StringField(label=_('Subject:'), max_length=256)

    mailbody = StringField(widget=AjaxWidget(wdgtype='TemplateTextField',

                                             inputid='mailbody'))

    form_buttons = [ImgButton('sendbutton', "javascript: $('#sendmail').submit()",

                              _('send email'), 'SEND_EMAIL_ICON'),

                    ImgButton('cancelbutton', "javascript: history.back()",

                              stdmsgs.BUTTON_CANCEL, 'CANCEL_EMAIL_ICON')]

    form_renderer_id = id

    def form_field_vocabulary(self, field):

        if field.name == 'recipient':

            vocab = [(entity.get_email(), entity.eid) for entity in self.rset.entities()]

            return [(label, value) for label, value in vocab if label]

        return super(MassMailingForm, self).form_field_vocabulary(field)

    def form_field_value(self, field, values):

        if field.name == 'recipient':

            return [entity.eid for entity in self.rset.entities() if entity.get_email()]

        elif field.name == 'mailbody':

            field.widget.attrs['cubicweb:variables'] = ','.join(self.get_allowed_substitutions())

        return super(MassMailingForm, self).form_field_value(field, values)

    def get_allowed_substitutions(self):

        attrs = []

        for coltype in self.rset.column_types(0):

            eclass = self.vreg.etype_class(coltype)

            attrs.append(eclass.allowed_massmail_keys())

        return sorted(reduce(operator.and_, attrs))

    def build_substitutions_help(self):

        insertLink = u'<a href="javascript: insertText(\'%%(%s)s\', \'emailarea\');">%%(%s)s</a>'

        substs = (u'<div class="substitution">%s</div>' % (insertLink % (subst, subst))

                  for subst in self.get_allowed_substitutions())

        helpmsg = self.req._('You can use any of the following substitutions in your text')

        return u'<div id="substitutions"><span>%s</span>%s</div>' % (

            helpmsg, u'\n'.join(substs))

class MassMailingFormRenderer(formrenderers.FormRenderer):

    id = 'massmailing'

    button_bar_class = u'toolbar'

    def _render_fields(self, fields, w, form):

        w(u'<table class="headersform">')

        for field in fields:

            if field.name == 'mailbody':

                w(u'</table>')

                self._render_toolbar(w, form)

                w(u'<table>')

                w(u'<tr><td><div>')

            else:

                w(u'<tr>')

                w(u'<td class="hlabel">%s</td>' % self.render_label(form, field))

                w(u'<td class="hvalue">')

            w(field.render(form, self))

            if field.name == 'mailbody':

                w(u'</div></td>')

                w(u'<td>%s</td>' % form.build_substitutions_help())

                w(u'</tr>')

            else:

                w(u'</td></tr>')

        w(u'</table>')

    def _render_toolbar(self, w, form):

        w(u'<div id="toolbar">')

        w(u'<ul>')

        for button in form.form_buttons:

            w(u'<li>%s</li>' % button.render(form))

        w(u'</ul>')

        w(u'</div>')

    def render_buttons(self, w, form):

        pass

class MassMailingFormView(FormViewMixIn, EntityView):

    id = 'massmailing'

    __select__ = implements(IEmailable) & match_user_groups('managers', 'users')

    def call(self):

        req = self.req

        req.add_js('cubicweb.widgets.js', 'cubicweb.massmailing.js')

        req.add_css('cubicweb.mailform.css')

        from_addr = '%s <%s>' % (req.user.dc_title(), req.user.get_email())

        form = self.vreg.select('forms', 'massmailing', self.req, rset=self.rset,

                                action='sendmail', domid='sendmail')

        self.w(form.form_render(sender=from_addr))