# mautrix-telegram - A Matrix-Telegram puppeting bridge
# Copyright (C) 2019 Tulir Asokan
#
# 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 <https://www.gnu.org/licenses/>.
from itertools import chain

from alchemysession import AlchemySessionContainer

from mautrix.bridge import Bridge
from mautrix.bridge.db import Base

from .web.provisioning import ProvisioningAPI
from .web.public import PublicBridgeWebsite
from .abstract_user import init as init_abstract_user
from .bot import Bot, init as init_bot
from .config import Config
from .context import Context
from .db import init as init_db
from .formatter import init as init_formatter
from .matrix import MatrixHandler
from .portal import init as init_portal
from .puppet import Puppet, init as init_puppet
from .sqlstatestore import SQLStateStore
from .user import User, init as init_user
from . import __version__

try:
    import prometheus_client as prometheus
except ImportError:
    prometheus = None


class TelegramBridge(Bridge):
    name = "mautrix-telegram"
    command = "python -m mautrix-telegram"
    description = "A Matrix-Telegram puppeting bridge."
    real_user_content_key = "net.maunium.telegram.puppet"
    version = __version__
    config_class = Config
    matrix_class = MatrixHandler
    state_store_class = SQLStateStore

    config: Config
    session_container: AlchemySessionContainer
    bot: Bot

    def prepare_db(self) -> None:
        super().prepare_db()
        init_db(self.db)
        self.session_container = AlchemySessionContainer(
            engine=self.db, table_base=Base, session=False,
            table_prefix="telethon_", manage_tables=False)

    def prepare_bridge(self) -> None:
        self.bot = init_bot(self.config)
        context = Context(self.az, self.config, self.loop, self.session_container, self.bot)

        if self.config["appservice.public.enabled"]:
            public_website = PublicBridgeWebsite(self.loop)
            self.az.app.add_subapp(self.config["appservice.public.prefix"], public_website.app)
            context.public_website = public_website

        if self.config["appservice.provisioning.enabled"]:
            provisioning_api = ProvisioningAPI(context)
            self.az.app.add_subapp(self.config["appservice.provisioning.prefix"],
                                   provisioning_api.app)
            context.provisioning_api = provisioning_api

        self.matrix = context.mx = MatrixHandler(context)

        if self.config["metrics.enabled"]:
            if prometheus:
                prometheus.start_http_server(self.config["metrics.listen_port"])
            else:
                self.log.warn("Metrics are enabled in the config, "
                              "but prometheus_client is not installed.")

        init_abstract_user(context)
        init_formatter(context)
        init_portal(context)
        puppet_startup = init_puppet(context)
        user_startup = init_user(context)
        bot_startup = [self.bot.start()] if self.bot else []
        self.startup_actions = chain(puppet_startup, user_startup, bot_startup)

    def prepare_stop(self) -> None:
        for puppet in Puppet.by_custom_mxid.values():
            puppet.stop()
        self.shutdown_actions = (user.stop() for user in User.by_tgid.values())


TelegramBridge().run()