# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
# Copyright (C) 2019 Pavel R. <pd at narayana dot im>
# Copyright (C) 2022 Bohdan Horbeshko <bodqhrohro@gmail.com>

# This file is part of Gajim OTR Plugin.
#
# Gajim OTR Plugin 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; version 3 only.
#
# This software 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 can always obtain full license text at <http://www.gnu.org/licenses/>.

# TODO: Fingerprints authentication GUI
# TODO: SMP authentication GUI
ERROR = None

import logging
from gajim.plugins import GajimPlugin
from gajim.common  import app
from gajim.common.modules.contacts import BareContact
from gi.repository import Gtk

log = logging.getLogger('gajim.p.otr')

try:  from Cryptodome import *
except ImportError as e:
    log.error(e)
    ERROR = 'Cryptodome is missing'

if not ERROR:
    try:
        from . import module
    except Exception as error:
        log.error(error)
        ERROR = 'Error: %s' % error

# ...
class OTRPlugin(GajimPlugin): 
    log = logging.getLogger('gajim.p.otr')

    # init plugin #
    def init(self):
        self.activatable = (not ERROR)
        if ERROR:
            self.available_text = (ERROR)
            return
        self.encryption_name = 'OTR'
        self.description = 'Provides Off-the-Record encryption'
        self.modules = [module]
        self.gui_extension_points = {
            'encrypt' + self.encryption_name: (self._encrypt_message, None),
            'message_actions_box': (self._message_actions_box_activate, self._message_actions_box_deactivate),
            'switch_contact': (self._switch_contact, None),
        } 
        self.switch = None
        self.switch_box = None
    
    @staticmethod
    def _get_box():
        return app.window.get_chat_stack().get_message_action_box()._ui.box

    def activate(self):
        if app.window is not None:
            box = self._get_box()
            self._actions_hack_activate(box)

    def deactivate(self):
        box = self._get_box()
        self._actions_hack_deactivate(box)

    @staticmethod
    def get_otr(account):
        return app.connections[account].get_module('OTR')

    # activate encryption #
    @staticmethod
    def activate_encryption(ctl): 
        return True
        
    # encrypt file (just return same file)
    @staticmethod 
    def encrypt_file(file, account, callback): 
        callback(file)

    def toggle_otr(self):
        print('toggle')

    #  encrypt message #
    def _encrypt_message(self,con,event,callback):
        if not event.message or event.type_ != 'chat': return # drop empty and non-chat messages  
        otr = self.get_otr(event.account)
        otr.otr.encrypt(event,callback)

    def _message_actions_box_activate(self, grid, box):
        if self.switch_box is None:
            self._actions_hack_activate(box)

    def _message_actions_box_deactivate(self, grid, box):
        if self.switch_box is not None:
            self._actions_hack_deactivate(box)

    def _actions_hack_activate(self, box):
        self.switch_box = Gtk.VBox()
        label = Gtk.Label(label='OTR')
        self.switch = Gtk.Switch()
        self.switch_box.pack_start(label, False, True, 0)
        self.switch_box.pack_start(self.switch, False, True, 0)
        self.switch_box.set_center_widget(self.switch)
        box.pack_start(self.switch_box, False, True, 0)
        self.switch.connect('activate', self.toggle_otr)
        if app.window is not None and hasattr(app.window, '_chat_page'):
            self._update_switch_visibility(app.window.get_chat_stack()._get_current_contact())

    def _actions_hack_deactivate(self, box):
        box.remove(self.switch_box)
        self.switch_box = None
        self.switch = None

    def _update_switch_visibility(self, contact):
        if isinstance(contact, BareContact):
            otr = self.get_otr(contact._account)
            self.switch.set_active(contact.jid.new_as_bare() in otr.otr.ctxs)
            self.switch_box.show_all()
        else:
            self.switch_box.hide()

    def _switch_contact(self, contact):
        self._update_switch_visibility(contact)