# 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 typing import Optional

from alchemysession import AlchemySessionContainer

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

from .web.provisioning import ProvisioningAPI
from .web.public import PublicBridgeWebsite
from .commands.manhole import ManholeState
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 Portal, 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 .version import version, linkified_version

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


class TelegramBridge(Bridge):
    module = "mautrix_telegram"
    name = "mautrix-telegram"
    command = "python -m mautrix-telegram"
    description = "A Matrix-Telegram puppeting bridge."
    repo_url = "https://github.com/tulir/mautrix-telegram"
    real_user_content_key = "net.maunium.telegram.puppet"
    version = version
    markdown_version = linkified_version
    config_class = Config
    matrix_class = MatrixHandler
    state_store_class = SQLStateStore

    config: Config
    session_container: AlchemySessionContainer
    bot: Bot
    manhole: Optional[ManholeState]

    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_website(self, context: Context) -> None:
        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

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

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

        init_abstract_user(context)
        init_formatter(context)
        init_portal(context)
        self.add_startup_actions(init_puppet(context))
        self.add_startup_actions(init_user(context))
        if self.bot:
            self.add_startup_actions(self.bot.start())
        if self.config["bridge.resend_bridge_info"]:
            self.add_startup_actions(self.resend_bridge_info())

    async def resend_bridge_info(self) -> None:
        self.config["bridge.resend_bridge_info"] = False
        self.config.save()
        self.log.info("Re-sending bridge info state event to all portals")
        for portal in Portal.all():
            await portal.update_bridge_info()
        self.log.info("Finished re-sending bridge info state events")

    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())
        if self.manhole:
            self.manhole.close()
            self.manhole = None


TelegramBridge().run()