# mautrix-signal - A Matrix-Signal puppeting bridge
# Copyright (C) 2020 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, List, TYPE_CHECKING
import asyncio
import logging

from mausignald import SignaldClient
from mausignald.types import (Message, MessageData, Receipt, TypingNotification, OwnReadReceipt,
                              Address, ReceiptType)
from mautrix.util.logging import TraceLogger

from .db import Message as DBMessage
from . import user as u, portal as po, puppet as pu

if TYPE_CHECKING:
    from .__main__ import SignalBridge


class SignalHandler(SignaldClient):
    log: TraceLogger = logging.getLogger("mau.signal")
    loop: asyncio.AbstractEventLoop

    def __init__(self, bridge: 'SignalBridge') -> None:
        super().__init__(bridge.config["signal.socket_path"], loop=bridge.loop)
        self.add_event_handler(Message, self.on_message)

    async def on_message(self, evt: Message) -> None:
        sender = await pu.Puppet.get_by_address(evt.source)
        if not sender.uuid:
            self.log.debug("Got message sender puppet with no UUID, not handling message")
            self.log.trace("Message content: %s", evt)
            return
        user = await u.User.get_by_username(evt.username)
        # TODO add lots of logging

        if evt.data_message:
            await self.handle_message(user, sender, evt.data_message)
        if evt.typing:
            # Typing notification from someone else
            pass
        if evt.receipt:
            await self.handle_receipt(sender, evt.receipt)
        if evt.sync_message:
            if evt.sync_message.read_messages:
                await self.handle_own_receipts(sender, evt.sync_message.read_messages)
            if evt.sync_message.contacts:
                # Contact list update?
                pass
            if evt.sync_message.sent:
                await self.handle_message(user, sender, evt.sync_message.sent.message,
                                          recipient_override=evt.sync_message.sent.destination)
            if evt.sync_message.typing:
                # Typing notification from own device
                pass

    @staticmethod
    async def handle_message(user: 'u.User', sender: 'pu.Puppet', msg: MessageData,
                             recipient_override: Optional[Address] = None) -> None:
        if msg.group:
            portal = await po.Portal.get_by_chat_id(msg.group.group_id, receiver=user.username)
        else:
            portal = await po.Portal.get_by_chat_id(recipient_override.uuid
                                                    if recipient_override else sender.uuid,
                                                    receiver=user.username)
        if not portal.mxid:
            # TODO create room?
            # TODO definitely at least log
            return
        if msg.reaction:
            await portal.handle_signal_reaction(sender, msg.reaction)
        if msg.body:
            await portal.handle_signal_message(sender, msg)

    @staticmethod
    async def handle_own_receipts(sender: 'pu.Puppet', receipts: List[OwnReadReceipt]) -> None:
        for receipt in receipts:
            puppet = await pu.Puppet.get_by_address(receipt.sender, create=False)
            if not puppet or not puppet.uuid:
                continue
            message = await DBMessage.find_by_sender_timestamp(puppet.uuid, receipt.timestamp)
            if not message:
                continue
            portal = await po.Portal.get_by_mxid(message.mx_room)
            if not portal:
                continue
            await sender.intent_for(portal).mark_read(portal.mxid, message.mxid)

    @staticmethod
    async def handle_receipt(sender: 'pu.Puppet', receipt: Receipt) -> None:
        if receipt.type != ReceiptType.READ:
            pass
        messages = await DBMessage.find_by_timestamps(receipt.timestamps)
        for message in messages:
            portal = await po.Portal.get_by_mxid(message.mx_room)
            await sender.intent_for(portal).mark_read(portal.mxid, message.mxid)

    async def start(self) -> None:
        await self.connect()
        async for user in u.User.all_logged_in():
            # TODO handle errors
            await self.subscribe(user.username)
            self.loop.create_task(user.sync())

    async def stop(self) -> None:
        await self.disconnect()