"""Mass mailing form views

"""

__docformat__ = "restructuredtext en"

_ = unicode

import operator

from cubicweb.interfaces import IEmailable

from cubicweb.selectors import implements, authenticated_user

from cubicweb.view import EntityView

from cubicweb.web import stdmsgs, action, form, formfields as ff

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

from cubicweb.web.views import forms, formrenderers

class SendEmailAction(action.Action):

    __regid__ = 'sendemail'

    # XXX should check email is set as well

    __select__ = (action.Action.__select__ & implements(IEmailable)

                  & authenticated_user())

    title = _('send email')

    category = 'mainactions'

    def url(self):

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

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

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

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

                                  **params)

def recipient_vocabulary(form, field):

    vocab = [(entity.get_email(), entity.eid) for entity in form.cw_rset.entities()]

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

class MassMailingForm(forms.FieldsForm):

    __regid__ = 'massmailing'

    needs_js = ('cubicweb.widgets.js', 'cubicweb.massmailing.js')

    needs_css = ('cubicweb.mailform.css')

    domid = 'sendmail'

    action = 'sendmail'

    sender = ff.StringField(widget=TextInput({'disabled': 'disabled'}),

                            label=_('From:'),

                            value=lambda f: '%s <%s>' % (f._cw.user.dc_title(), f._cw.user.get_email()))

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

                               choices=recipient_vocabulary,

                               value= lambda f: [entity.eid for entity in f.cw_rset.entities() if entity.get_email()])

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

    mailbody = ff.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 = __regid__

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

        super(MassMailingForm, self).__init__(*args, **kwargs)

        field = self.field_by_name('mailbody')

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

    def get_allowed_substitutions(self):

        attrs = []

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

            eclass = self._cw.vreg['etypes'].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._cw._('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):

    __regid__ = 'massmailing'

    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(form.FormViewMixIn, EntityView):

    __regid__ = 'massmailing'

    __select__ = implements(IEmailable) & authenticated_user()

    def call(self):

        form = self._cw.vreg['forms'].select('massmailing', self._cw,

                                             rset=self.cw_rset)

        self.w(form.render())