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

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""

kallithea.model.notification

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Model for notifications

This file was forked by the Kallithea project in July 2014.

Original author and date, and relevant copyright and licensing information is below:

:created_on: Nov 20, 2011

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH, and others.

:license: GPLv3, see LICENSE.md for more details.

"""

import logging

import traceback

from tg import tmpl_context as c, app_globals

from tg.i18n import ugettext as _

from sqlalchemy.orm import joinedload, subqueryload

import kallithea

from kallithea.lib import helpers as h

from kallithea.lib.utils2 import safe_unicode

from kallithea.model.db import Notification, User, UserNotification

from kallithea.model.meta import Session

log = logging.getLogger(__name__)

class NotificationModel(object):

    def create(self, created_by, subject, body, recipients=None,

               type_=Notification.TYPE_MESSAGE, with_email=True,

               email_kwargs=None, repo_name=None):

        """

        Creates notification of given type

        :param created_by: int, str or User instance. User who created this

            notification

        :param subject:

        :param body:

        :param recipients: list of int, str or User objects, when None

            is given send to all admins

        :param type_: type of notification

        :param with_email: send email with this notification

        :param email_kwargs: additional dict to pass as args to email template

        """

        from kallithea.lib.celerylib import tasks

        email_kwargs = email_kwargs or {}

        if recipients and not getattr(recipients, '__iter__', False):

            raise Exception('recipients must be a list or iterable')

        created_by_obj = User.guess_instance(created_by)

        if recipients:

            for u in recipients:

                obj = User.guess_instance(u)

                if obj is not None:

                else:

                    # TODO: inform user that requested operation couldn't be completed

                    log.error('cannot email unknown user %r', u)

            log.debug('sending notifications %s to %s',

                type_, recipients_objs

            )

        elif recipients is None:

            # empty recipients means to all admins

            recipients_objs = User.query().filter(User.admin == True).all()

            log.debug('sending notifications %s to admins: %s',

                type_, recipients_objs

            )

        #else: silently skip notification mails?

        # TODO: inform user who are notified

        notif = Notification.create(

            created_by=created_by_obj, subject=subject,

            body=body, recipients=recipients_objs, type_=type_

        )

        if not with_email:

            return notif

        headers = {}

        headers['X-Kallithea-Notification-Type'] = type_

        if 'threading' in email_kwargs:

            headers['References'] = ' '.join('<%s>' % x for x in email_kwargs['threading'])

        # this is passed into template

        html_kwargs = {

                  'subject': subject,

                  'body': h.render_w_mentions(body, repo_name),

                  'when': h.fmt_date(notif.created_on),

                  'user': notif.created_by_user.username,

                  }

        txt_kwargs = {

                  'subject': subject,

                  'body': body,

                  'when': h.fmt_date(notif.created_on),

                  'user': notif.created_by_user.username,

                  }

        html_kwargs.update(email_kwargs)

        txt_kwargs.update(email_kwargs)

        email_subject = EmailNotificationModel() \

                            .get_email_description(type_, **txt_kwargs)

        email_txt_body = EmailNotificationModel() \

                            .get_email_tmpl(type_, 'txt', **txt_kwargs)

        email_html_body = EmailNotificationModel() \

                            .get_email_tmpl(type_, 'html', **html_kwargs)

        # don't send email to person who created this comment

        rec_objs = set(recipients_objs).difference(set([created_by_obj]))

        # send email with notification to all other participants

        for rec in rec_objs:

            tasks.send_email([rec.email], email_subject, email_txt_body,

                     email_html_body, headers, author=created_by_obj)

        return notif

    def delete(self, user, notification):

        # we don't want to remove actual notification just the assignment

        try:

            notification = Notification.guess_instance(notification)

            user = User.guess_instance(user)

            if notification and user:

                obj = UserNotification.query() \

                        .filter(UserNotification.user == user) \

                        .filter(UserNotification.notification

                                == notification) \

                        .one()

                Session().delete(obj)

                return True

        except Exception:

            log.error(traceback.format_exc())

            raise

    def query_for_user(self, user, filter_=None):

        """

        Get notifications for given user, filter them if filter dict is given

        :param user:

        :param filter:

        """

        user = User.guess_instance(user)

        q = UserNotification.query() \

            .filter(UserNotification.user == user) \

            .join((Notification, UserNotification.notification_id ==

                                 Notification.notification_id)) \

            .options(joinedload('notification')) \

            .options(subqueryload('notification.created_by_user')) \

            .order_by(Notification.created_on.desc())

        if filter_:

            q = q.filter(Notification.type_.in_(filter_))

        return q

    def mark_read(self, user, notification):

        try:

            notification = Notification.guess_instance(notification)

            user = User.guess_instance(user)

            if notification and user:

                obj = UserNotification.query() \

                        .filter(UserNotification.user == user) \

                        .filter(UserNotification.notification

                                == notification) \

                        .one()

                obj.read = True

                return True

        except Exception:

            log.error(traceback.format_exc())

            raise

    def mark_all_read_for_user(self, user, filter_=None):

        user = User.guess_instance(user)

        q = UserNotification.query() \

            .filter(UserNotification.user == user) \

            .filter(UserNotification.read == False) \

            .join((Notification, UserNotification.notification_id ==

                                 Notification.notification_id))

        if filter_:

            q = q.filter(Notification.type_.in_(filter_))

        # this is a little inefficient but sqlalchemy doesn't support

        # update on joined tables :(

        for obj in q:

            obj.read = True

    def get_unread_cnt_for_user(self, user):

        user = User.guess_instance(user)

        return UserNotification.query() \

                .filter(UserNotification.read == False) \

                .filter(UserNotification.user == user).count()

    def get_unread_for_user(self, user):

        user = User.guess_instance(user)

        return [x.notification for x in UserNotification.query() \

                .filter(UserNotification.read == False) \

                .filter(UserNotification.user == user).all()]

    def get_user_notification(self, user, notification):

        user = User.guess_instance(user)

        notification = Notification.guess_instance(notification)

        return UserNotification.query() \

            .filter(UserNotification.notification == notification) \

            .filter(UserNotification.user == user).scalar()

    def make_description(self, notification, show_age=True):

        """

        Creates a human readable description based on properties

        of notification object

        """

        # alias

        _n = notification

        if show_age:

            return {

                    _n.TYPE_CHANGESET_COMMENT: _('%(user)s commented on changeset %(age)s'),

                    _n.TYPE_MESSAGE: _('%(user)s sent message %(age)s'),

                    _n.TYPE_MENTION: _('%(user)s mentioned you %(age)s'),

                    _n.TYPE_REGISTRATION: _('%(user)s registered in Kallithea %(age)s'),

                    _n.TYPE_PULL_REQUEST: _('%(user)s opened new pull request %(age)s'),

                    _n.TYPE_PULL_REQUEST_COMMENT: _('%(user)s commented on pull request %(age)s'),

                }[notification.type_] % dict(

                    user=notification.created_by_user.username,

                    age=h.age(notification.created_on),

                )

        else:

            return {

                    _n.TYPE_CHANGESET_COMMENT: _('%(user)s commented on changeset at %(when)s'),

                    _n.TYPE_MESSAGE: _('%(user)s sent message at %(when)s'),

                    _n.TYPE_MENTION: _('%(user)s mentioned you at %(when)s'),

                    _n.TYPE_REGISTRATION: _('%(user)s registered in Kallithea at %(when)s'),

                    _n.TYPE_PULL_REQUEST: _('%(user)s opened new pull request at %(when)s'),

                    _n.TYPE_PULL_REQUEST_COMMENT: _('%(user)s commented on pull request at %(when)s'),

                }[notification.type_] % dict(

                    user=notification.created_by_user.username,

                    when=h.fmt_date(notification.created_on),

                )

class EmailNotificationModel(object):

    TYPE_CHANGESET_COMMENT = Notification.TYPE_CHANGESET_COMMENT

    TYPE_MESSAGE = Notification.TYPE_MESSAGE # only used for testing

    # Notification.TYPE_MENTION is not used

    TYPE_PASSWORD_RESET = 'password_link'

    TYPE_REGISTRATION = Notification.TYPE_REGISTRATION

    TYPE_PULL_REQUEST = Notification.TYPE_PULL_REQUEST

    TYPE_PULL_REQUEST_COMMENT = Notification.TYPE_PULL_REQUEST_COMMENT

    TYPE_DEFAULT = 'default'

    def __init__(self):

        super(EmailNotificationModel, self).__init__()

        self._template_root = kallithea.CONFIG['paths']['templates'][0]

        self._tmpl_lookup = app_globals.mako_lookup

        self.email_types = {

            self.TYPE_CHANGESET_COMMENT: 'changeset_comment',

            self.TYPE_PASSWORD_RESET: 'password_reset',

            self.TYPE_REGISTRATION: 'registration',

            self.TYPE_DEFAULT: 'default',

            self.TYPE_PULL_REQUEST: 'pull_request',

            self.TYPE_PULL_REQUEST_COMMENT: 'pull_request_comment',

        }

        self._subj_map = {

            self.TYPE_CHANGESET_COMMENT: _('[Comment] %(repo_name)s changeset %(short_id)s "%(message_short)s" on %(branch)s'),

            self.TYPE_MESSAGE: 'Test Message',

            # self.TYPE_PASSWORD_RESET

            self.TYPE_REGISTRATION: _('New user %(new_username)s registered'),

            # self.TYPE_DEFAULT

            self.TYPE_PULL_REQUEST: _('[Review] %(repo_name)s PR %(pr_nice_id)s "%(pr_title_short)s" from %(pr_source_branch)s by %(pr_owner_username)s'),

            self.TYPE_PULL_REQUEST_COMMENT: _('[Comment] %(repo_name)s PR %(pr_nice_id)s "%(pr_title_short)s" from %(pr_source_branch)s by %(pr_owner_username)s'),

        }

    def get_email_description(self, type_, **kwargs):

        """

        return subject for email based on given type

        """

        tmpl = self._subj_map[type_]

        try:

            subj = tmpl % kwargs

        except KeyError as e:

            log.error('error generating email subject for %r from %s: %s', type_, ','.join(self._subj_map.keys()), e)

            raise

        l = [safe_unicode(x) for x in [kwargs.get('status_change'), kwargs.get('closing_pr') and _('Closing')] if x]

        if l:

            if subj.startswith('['):

                subj = '[' + ', '.join(l) + ': ' + subj[1:]

            else:

                subj = '[' + ', '.join(l) + '] ' + subj

        return subj

    def get_email_tmpl(self, type_, content_type, **kwargs):

        """

        return generated template for email based on given type

        """

        base = 'email_templates/' + self.email_types.get(type_, self.email_types[self.TYPE_DEFAULT]) + '.' + content_type

        email_template = self._tmpl_lookup.get_template(base)

        # translator and helpers inject

        _kwargs = {'_': _,

                   'h': h,

                   'c': c}

        _kwargs.update(kwargs)

        if content_type == 'html':

            _kwargs.update({

                "color_text": "#202020",

                "color_emph": "#395fa0",

                "color_link": "#395fa0",

                "color_border": "#ddd",

                "color_background_grey": "#f9f9f9",

                "color_button": "#395fa0",

                "monospace_style": "font-family:Lucida Console,Consolas,Monaco,Inconsolata,Liberation Mono,monospace",

                "sans_style": "font-family:Helvetica,Arial,sans-serif",

                })

            _kwargs.update({

                "default_style": "%(sans_style)s;font-weight:200;font-size:14px;line-height:17px;color:%(color_text)s" % _kwargs,

                "comment_style": "%(monospace_style)s;white-space:pre-wrap" % _kwargs,

                "data_style": "border:%(color_border)s 1px solid;background:%(color_background_grey)s" % _kwargs,

                "emph_style": "font-weight:600;color:%(color_emph)s" % _kwargs,

                "link_style": "color:%(color_link)s;text-decoration:none" % _kwargs,

                "link_text_style": "color:%(color_text)s;text-decoration:none;border:%(color_border)s 1px solid;background:%(color_background_grey)s" % _kwargs,

                })

        log.debug('rendering tmpl %s with kwargs %s', base, _kwargs)

        return email_template.render_unicode(**_kwargs)