"""Mass mailing form views

:organization: Logilab

:copyright: 2007-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

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

"""

__docformat__ = "restructuredtext en"

import operator

from logilab.mtconverter import html_escape

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 FieldsForm, FormRenderer

from cubicweb.web.formfields import StringField

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

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(FieldsForm):

    id = 'massmailing'

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

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

    subject = StringField(label=_('Subject:'))

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

                                             inputid='mailarea'))

    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'] = self.get_allowed_substitutions()

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

    def form_buttons(self):

        context = {'domid': self.domid,

                   'cancel' : self.req._(stdmsgs.BUTTON_CANCEL),

                   'send' : self.req._('send email'),

                   'sendimgpath' : self.req.external_resource('SEND_EMAIL_ICON'),

                   }

        return ['''<a id="sendbutton" href="javascript: $('%(domid)s').submit()">

<img src="%(sendimgpath)s" alt="%(send)s"/>%(send)s</a>''' % context,

                '''<a id="cancelbutton" href="javascript: history.back()">

<img src="%(cancelimgpath)s" alt="%(cancel)s"/>%(cancel)s</a>''' % context,

                ]

    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(FormRenderer):

    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>')

                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>')

class MassMailingFormView(EntityView):

    id = 'massmailing'

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

    def call(self):

        req = self.req

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

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

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

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

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

        self.w(form.form_render(sender=from_addr, renderer=MassMailingFormRenderer()))