#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# SAT standard user interface for managing contacts
# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)
# Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from sat.core.i18n import D_
from sat.core.constants import Const as C
from sat.core.log import getLogger
log = getLogger(__name__)
from sat.core import exceptions
from sat.tools import xml_tools
from sat.memory.memory import ProfileSessions
from twisted.words.protocols.jabber import jid


class ProfileManager(object):
    """Manage profiles."""

    def __init__(self, host):
        self.host = host
        self.profile_ciphers = {}
        self._sessions = ProfileSessions()
        host.registerCallback(self._authenticateProfile, force_id=C.AUTHENTICATE_PROFILE_ID, with_data=True)
        host.registerCallback(self._changeXMPPPassword, force_id=C.CHANGE_XMPP_PASSWD_ID, with_data=True)
        self.__new_xmpp_passwd_id = host.registerCallback(self._changeXMPPPasswordCb, with_data=True)

    def _startSessionEb(self, fail, first, profile):
        """Errback method for startSession during profile authentication

        @param first(bool): if True, this is the first try and we have tryied empty password
            in this case we ask for a password to the user.
        @param profile(unicode, None): %(doc_profile)s
            must only be used if first is True
        """
        if first:
            # first call, we ask for the password
            form_ui = xml_tools.XMLUI("form", title=D_('Profile password for {}').format(profile), submit_id='')
            form_ui.addPassword('profile_password', value='')
            d = xml_tools.deferredUI(self.host, form_ui, chained=True)
            d.addCallback(self._authenticateProfile, profile)
            return {'xmlui': form_ui.toXml()}

        assert profile is None

        if fail.check(exceptions.PasswordError):
            dialog = xml_tools.XMLUI('popup', title=D_('Connection error'))
            dialog.addText(D_("The provided profile password doesn't match."))
        else:
            log.error(u"Unexpected exceptions: {}".format(fail))
            dialog = xml_tools.XMLUI('popup', title=D_('Internal error'))
            dialog.addText(D_(u"Internal error: {}".format(fail)))
        return {'xmlui': dialog.toXml(), 'validated': C.BOOL_FALSE}

    def _authenticateProfile(self, data, profile):
        if C.bool(data.get('cancelled', 'false')):
            return {}
        if self.host.memory.isSessionStarted(profile):
            return {'validated': C.BOOL_TRUE}
        try:
            password = data[xml_tools.formEscape('profile_password')]
        except KeyError:
            # first request, we try empty password
            password = ''
            first = True
            eb_profile = profile
        else:
            first = False
            eb_profile = None
        d = self.host.memory.startSession(password, profile)
        d.addCallback(lambda dummy: {'validated': C.BOOL_TRUE})
        d.addErrback(self._startSessionEb, first, eb_profile)
        return d

    def _changeXMPPPassword(self, data, profile):
        session_data = self._sessions.profileGetUnique(profile)
        if not session_data:
            server = self.host.memory.getParamA(C.FORCE_SERVER_PARAM, "Connection", profile_key=profile)
            if not server:
                server = jid.parse(self.host.memory.getParamA('JabberID', "Connection", profile_key=profile))[1]
            session_id, session_data = self._sessions.newSession({'count': 0, 'server': server}, profile=profile)
        if session_data['count'] > 2:  # 3 attempts with a new password after the initial try
            self._sessions.profileDelUnique(profile)
            _dialog = xml_tools.XMLUI('popup', title=D_('Connection error'))
            _dialog.addText(D_("Can't connect to %s. Please check your connection details.") % session_data['server'])
            return {'xmlui': _dialog.toXml()}
        session_data['count'] += 1
        counter = ' (%d)' % session_data['count'] if session_data['count'] > 1 else ''
        title = D_('XMPP password for %(profile)s%(counter)s') % {'profile': profile, 'counter': counter}
        form_ui = xml_tools.XMLUI("form", title=title, submit_id=self.__new_xmpp_passwd_id)
        form_ui.addText(D_("Can't connect to %s. Please check your connection details or try with another password.") % session_data['server'])
        form_ui.addPassword('xmpp_password', value='')
        return {'xmlui': form_ui.toXml()}

    def _changeXMPPPasswordCb(self, data, profile):
        xmpp_password = data[xml_tools.formEscape('xmpp_password')]
        d = self.host.memory.setParam("Password", xmpp_password, "Connection", profile_key=profile)
        d.addCallback(lambda dummy: self.host.asyncConnect(profile))
        d.addCallback(lambda dummy: {})
        d.addErrback(lambda dummy: self._changeXMPPPassword({}, profile))
        return d