"""some views to handle notification on data changes

"""

__docformat__ = "restructuredtext en"

_ = unicode

from itertools import repeat

from logilab.common.textutils import normalize_text

from logilab.common.deprecation import class_renamed, class_moved, deprecated

from cubicweb.selectors import yes

from cubicweb.view import Component

from cubicweb.mail import NotificationView, SkipEmail

from cubicweb.server.hook import SendMailOp

class RecipientsFinder(Component):

    """this component is responsible to find recipients of a notification

    by default user's with their email set are notified if any, else the default

    email addresses specified in the configuration are used

    """

    __regid__ = 'recipients_finder'

    __select__ = yes()

    user_rql = ('Any X,E,A WHERE X is CWUser, X in_state S, S name "activated",'

                'X primary_email E, E address A')

    def recipients(self):

        mode = self._cw.vreg.config['default-recipients-mode']

        if mode == 'users':

            execute = self._cw.execute

            dests = [(u.get_email(), u.property_value('ui.language'))

                     for u in execute(self.user_rql, build_descr=True).entities()]

        elif mode == 'default-dest-addrs':

            lang = self._cw.vreg.property_value('ui.language')

            dests = zip(self._cw.vreg.config['default-dest-addrs'], repeat(lang))

        else: # mode == 'none'

            dests = []

        return dests

# abstract or deactivated notification views and mixin ########################

class NotificationView(NotificationView):

    """overriden to delay actual sending of mails to a commit operation by

    default

    """

    def send_on_commit(self, recipients, msg):

        SendMailOp(self._cw, recipients=recipients, msg=msg)

    send = send_on_commit

class StatusChangeMixIn(object):

    __regid__ = 'notif_status_change'

    msgid_timestamp = True

    message = _('status changed')

    content = _("""

%(user)s changed status from <%(previous_state)s> to <%(current_state)s> for entity

'%(title)s'

%(comment)s

url: %(url)s

""")

###############################################################################

# Actual notification views.                                                  #

#                                                                             #

# disable them at the recipients_finder level if you don't want them          #

###############################################################################

# XXX should be based on dc_title/dc_description, no?

class ContentAddedView(NotificationView):

    """abstract class for notification on entity/relation

    all you have to do by default is :

    * set id and __select__ attributes to match desired events and entity types

    * set a content attribute to define the content of the email (unless you

      override call)

    """

    __abstract__ = True

    __regid__ = 'notif_after_add_entity'

    msgid_timestamp = False

    message = _('new')

    content = """

%(title)s

%(content)s

url: %(url)s

"""

    def context(self, **kwargs):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        content = entity.printable_value(self.content_attr, format='text/plain')

        if content:

            contentformat = getattr(entity, self.content_attr + '_format',

                                    'text/rest')

            # XXX don't try to wrap rest until we've a proper transformation (see

            # #103822)

            if contentformat != 'text/rest':

                content = normalize_text(content, 80)

        return super(ContentAddedView, self).context(content=content, **kwargs)

    def subject(self):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        return  u'%s #%s (%s)' % (self._cw.__('New %s' % entity.e_schema),

                                  entity.eid, self.user_data['login'])

def format_value(value):

    if isinstance(value, unicode):

        return u'"%s"' % value

    return value

class EntityUpdatedNotificationView(NotificationView):

    """abstract class for notification on entity/relation

    all you have to do by default is :

    * set id and __select__ attributes to match desired events and entity types

    * set a content attribute to define the content of the email (unless you

      override call)

    """

    __abstract__ = True

    __regid__ = 'notif_entity_updated'

    msgid_timestamp = False

    message = _('updated')

    no_detailed_change_attrs = ()

    content = """

Properties have been updated by %(user)s:

%(changes)s

url: %(url)s

"""

    def context(self, **kwargs):

        context = super(EntityUpdatedNotificationView, self).context(**kwargs)

        changes = self._cw.transaction_data['changes'][self.cw_rset[0][0]]

        _ = self._cw._

        formatted_changes = []

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        for attr, oldvalue, newvalue in sorted(changes):

            # check current user has permission to see the attribute

            rschema = self._cw.vreg.schema[attr]

            if rschema.final:

                rdef = entity.e_schema.rdef(rschema)

                if not rdef.has_perm(self._cw, 'read', eid=self.cw_rset[0][0]):

                    continue

            # XXX suppose it's a subject relation...

            elif not rschema.has_perm(self._cw, 'read',

                                      fromeid=self.cw_rset[0][0]):

                continue

            if attr in self.no_detailed_change_attrs:

                msg = _('%s updated') % _(attr)

            elif oldvalue not in (None, ''):

                msg = _('%(attr)s updated from %(oldvalue)s to %(newvalue)s') % {

                    'attr': _(attr),

                    'oldvalue': format_value(oldvalue),

                    'newvalue': format_value(newvalue)}

            else:

                msg = _('%(attr)s set to %(newvalue)s') % {

                    'attr': _(attr), 'newvalue': format_value(newvalue)}

            formatted_changes.append('* ' + msg)

        if not formatted_changes:

            # current user isn't allowed to see changes, skip this notification

            raise SkipEmail()

        context['changes'] = '\n'.join(formatted_changes)

        return context

    def subject(self):

        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)

        return  u'%s #%s (%s)' % (self._cw.__('Updated %s' % entity.e_schema),

                                  entity.eid, self.user_data['login'])

from cubicweb.hooks.notification import RenderAndSendNotificationView

from cubicweb.mail import parse_message_id

NormalizedTextView = class_renamed('NormalizedTextView', ContentAddedView)

RenderAndSendNotificationView = class_moved(RenderAndSendNotificationView)

parse_message_id = deprecated('parse_message_id is now defined in cubicweb.mail')(parse_message_id)