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# Copyright 2011 GRNET S.A. All rights reserved.

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#   2. Redistributions in binary form must reproduce the above

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#      disclaimer in the documentation and/or other materials

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

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import logging

import socket

from django.utils.translation import ugettext as _

from django.template.loader import render_to_string

from django.core.mail import send_mail

from django.core.urlresolvers import reverse

from django.template import Context, loader

from django.contrib.auth import (

    login as auth_login,

    logout as auth_logout

)

from django.conf import settings

from django.contrib.auth.models import AnonymousUser

from urllib import quote

from urlparse import urljoin

from smtplib import SMTPException

from datetime import datetime

from functools import wraps

from astakos.im.settings import (

    DEFAULT_CONTACT_EMAIL, SITENAME, BASEURL, LOGGING_LEVEL,

    VERIFICATION_EMAIL_SUBJECT, ACCOUNT_CREATION_SUBJECT,

    GROUP_CREATION_SUBJECT, HELPDESK_NOTIFICATION_EMAIL_SUBJECT,

    INVITATION_EMAIL_SUBJECT, GREETING_EMAIL_SUBJECT, FEEDBACK_EMAIL_SUBJECT,

    EMAIL_CHANGE_EMAIL_SUBJECT

)

import astakos.im.messages as astakos_messages

logger = logging.getLogger(__name__)

def logged(func, msg):

    @wraps(func)

    def with_logging(*args, **kwargs):

        email = ''

        user = None

        try:

            request = args[0]

            email = request.user.email

        except (KeyError, AttributeError), e:

            email = ''

        r = func(*args, **kwargs)

        if LOGGING_LEVEL:

            logger.log(LOGGING_LEVEL, msg % email)

        return r

    return with_logging

def login(request, user):

    auth_login(request, user)

    from astakos.im.models import SessionCatalog

    SessionCatalog(

        session_key=request.session.session_key,

        user=user

    ).save()

login = logged(login, '%s logged in.')

logout = logged(auth_logout, '%s logged out.')

def send_verification(user, template_name='im/activation_email.txt'):

    """

    Send email to user to verify his/her email and activate his/her account.

    Raises SendVerificationError

    """

    url = '%s?auth=%s&next=%s' % (urljoin(BASEURL, reverse('activate')),

                                  quote(user.auth_token),

                                  quote(urljoin(BASEURL, reverse('index'))))

    message = render_to_string(template_name, {

                               'user': user,

                               'url': url,

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': DEFAULT_CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    try:

        send_mail(_(VERIFICATION_EMAIL_SUBJECT), message, sender, [user.email])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendVerificationError()

    else:

        msg = 'Sent activation %s' % user.email

        logger.log(LOGGING_LEVEL, msg)

def send_activation(user, template_name='im/activation_email.txt'):

    send_verification(user, template_name)

    user.activation_sent = datetime.now()

    user.save()

def _send_admin_notification(template_name,

                             dictionary=None,

                             subject='alpha2 testing notification',):

    """

    Send notification email to settings.ADMINS.

    Raises SendNotificationError

    """

    if not settings.ADMINS:

        return

    dictionary = dictionary or {}

    message = render_to_string(template_name, dictionary)

    sender = settings.SERVER_EMAIL

    try:

        send_mail(subject,

                  message, sender, [i[1] for i in settings.ADMINS])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendNotificationError()

    else:

        msg = 'Sent admin notification for user %s' % dictionary

        logger.log(LOGGING_LEVEL, msg)

def send_account_creation_notification(template_name, dictionary=None):

    user = dictionary.get('user', AnonymousUser())

    subject = _(ACCOUNT_CREATION_SUBJECT) % {'user':user.get('email', '')}

    return _send_admin_notification(template_name, dictionary, subject=subject)

def send_group_creation_notification(template_name, dictionary=None):

    group = dictionary.get('group')

    if not group:

        return

    subject = _(GROUP_CREATION_SUBJECT) % {'group':group.get('name', '')}

    return _send_admin_notification(template_name, dictionary, subject=subject)

def send_helpdesk_notification(user, template_name='im/helpdesk_notification.txt'):

    """

    Send email to DEFAULT_CONTACT_EMAIL to notify for a new user activation.

    Raises SendNotificationError

    """

    if not DEFAULT_CONTACT_EMAIL:

        return

    message = render_to_string(

        template_name,

        {'user': user}

    )

    sender = settings.SERVER_EMAIL

    try:

        send_mail(

            _(HELPDESK_NOTIFICATION_EMAIL_SUBJECT) % {'user': user.email},

            message, sender, [DEFAULT_CONTACT_EMAIL])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendNotificationError()

    else:

        msg = 'Sent helpdesk admin notification for %s' % user.email

        logger.log(LOGGING_LEVEL, msg)

def send_invitation(invitation, template_name='im/invitation.txt'):

    """

    Send invitation email.

    Raises SendInvitationError

    """

    subject = _(INVITATION_EMAIL_SUBJECT)

    url = '%s?code=%d' % (urljoin(BASEURL, reverse('index')), invitation.code)

    message = render_to_string(template_name, {

                               'invitation': invitation,

                               'url': url,

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': DEFAULT_CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    try:

        send_mail(subject, message, sender, [invitation.username])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendInvitationError()

    else:

        msg = 'Sent invitation %s' % invitation

        logger.log(LOGGING_LEVEL, msg)

        invitation.inviter.invitations = max(0, invitation.inviter.invitations - 1)

        invitation.inviter.save()

def send_greeting(user, email_template_name='im/welcome_email.txt'):

    """

    Send welcome email.

    Raises SMTPException, socket.error

    """

    subject = _(GREETING_EMAIL_SUBJECT)

    message = render_to_string(email_template_name, {

                               'user': user,

                               'url': urljoin(BASEURL, reverse('index')),

                               'baseurl': BASEURL,

                               'site_name': SITENAME,

                               'support': DEFAULT_CONTACT_EMAIL})

    sender = settings.SERVER_EMAIL

    try:

        send_mail(subject, message, sender, [user.email])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendGreetingError()

    else:

        msg = 'Sent greeting %s' % user.email

        logger.log(LOGGING_LEVEL, msg)

def send_feedback(msg, data, user, email_template_name='im/feedback_mail.txt'):

    subject = _(FEEDBACK_EMAIL_SUBJECT)

    from_email = user.email

    recipient_list = [DEFAULT_CONTACT_EMAIL]

    content = render_to_string(email_template_name, {

        'message': msg,

        'data': data,

        'user': user})

    try:

        send_mail(subject, content, from_email, recipient_list)

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise SendFeedbackError()

    else:

        msg = 'Sent feedback from %s' % user.email

        logger.log(LOGGING_LEVEL, msg)

def send_change_email(ec, request, email_template_name='registration/email_change_email.txt'):

    try:

        url = reverse('email_change_confirm',

                      kwargs={'activation_key': ec.activation_key})

        url = request.build_absolute_uri(url)

        t = loader.get_template(email_template_name)

        c = {'url': url, 'site_name': SITENAME}

        from_email = settings.SERVER_EMAIL

        send_mail(_(EMAIL_CHANGE_EMAIL_SUBJECT),

                  t.render(Context(c)), from_email, [ec.new_email_address])

    except (SMTPException, socket.error) as e:

        logger.exception(e)

        raise ChangeEmailError()

    else:

        msg = 'Sent change email for %s' % ec.user.email

        logger.log(LOGGING_LEVEL, msg)

def activate(

    user,

    email_template_name='im/welcome_email.txt',

    helpdesk_email_template_name='im/helpdesk_notification.txt',

    verify_email=False

):

    """

    Activates the specific user and sends email.

    Raises SendGreetingError, ValidationError

    """

    user.is_active = True

    if verify_email:

        user.email_verified = True

    user.save()

    send_helpdesk_notification(user, helpdesk_email_template_name)

    send_greeting(user, email_template_name)

def switch_account_to_shibboleth(user, local_user,

                                 greeting_template_name='im/welcome_email.txt'):

    try:

        provider = user.provider

    except AttributeError:

        return

    else:

        if not provider == 'shibboleth':

            return

        user.delete()

        local_user.provider = 'shibboleth'

        local_user.third_party_identifier = user.third_party_identifier

        local_user.save()

        send_greeting(local_user, greeting_template_name)

        return local_user

class SendMailError(Exception):

    pass

class SendAdminNotificationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.ADMIN_NOTIFICATION_SEND_ERR)

        super(SendAdminNotificationError, self).__init__()

class SendVerificationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.VERIFICATION_SEND_ERR)

        super(SendVerificationError, self).__init__()

class SendInvitationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.INVITATION_SEND_ERR)

        super(SendInvitationError, self).__init__()

class SendGreetingError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.GREETING_SEND_ERR)

        super(SendGreetingError, self).__init__()

class SendFeedbackError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.FEEDBACK_SEND_ERR)

        super(SendFeedbackError, self).__init__()

class ChangeEmailError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.CHANGE_EMAIL_SEND_ERR)

        super(ChangeEmailError, self).__init__()

class SendNotificationError(SendMailError):

    def __init__(self):

        self.message = _(astakos_messages.NOTIFICATION_SEND_ERR)

        super(SendNotificationError, self).__init__()