# matrix-appservice-kakaotalk - A Matrix-KakaoTalk puppeting bridge.
# Copyright (C) 2022 Tulir Asokan, Andrew Ferrazzutti
#
# 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 __future__ import annotations

from typing import TYPE_CHECKING

from mautrix.bridge import BaseMatrixHandler
from mautrix.types import (
    Event,
    EventID,
    EventType,
    ReceiptEvent,
    RedactionEvent,
    RoomID,
    SingleReceiptEventContent,
    StateEvent,
    UserID,
)

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

if TYPE_CHECKING:
    from .__main__ import KakaoTalkBridge


class MatrixHandler(BaseMatrixHandler):
    def __init__(self, bridge: KakaoTalkBridge) -> None:
        prefix, suffix = bridge.config["bridge.username_template"].format(userid=":").split(":")
        homeserver = bridge.config["homeserver.domain"]
        self.user_id_prefix = f"@{prefix}"
        self.user_id_suffix = f"{suffix}:{homeserver}"
        super().__init__(bridge=bridge)

    @staticmethod
    async def allow_bridging_message(user: u.User, portal: po.Portal) -> bool:
        if user.is_connected:
            return True
        if user.relay_whitelisted and portal.has_relay:
            relay_user = await portal.get_relay_user()
            return relay_user and relay_user.is_connected
        return False

    async def send_welcome_message(self, room_id: RoomID, inviter: u.User) -> None:
        await super().send_welcome_message(room_id, inviter)
        if not inviter.notice_room:
            inviter.notice_room = room_id
            await inviter.save()
            await self.az.intent.send_notice(
                room_id, "This room has been marked as your KakaoTalk bridge notice room."
            )

    async def handle_puppet_dm_invite(
        self, room_id: RoomID, puppet: pu.Puppet, invited_by: u.User, evt: StateEvent
    ) -> None:
        # TODO Make upstream request to return custom failure message,
        #      instead of having to reimplement the entire function
        portal = await invited_by.get_portal_with(puppet)
        if portal:
            await portal.accept_matrix_dm(room_id, invited_by, puppet)
        else:
            await puppet.default_mxid_intent.leave_room(
                room_id, reason="Unable to create a DM for this KakaoTalk user"
            )

    async def handle_invite(
        self, room_id: RoomID, user_id: UserID, invited_by: u.User, event_id: EventID
    ) -> None:
        # TODO handle puppet and user invites for group chats
        # The rest can probably be ignored
        pass

    async def handle_join(self, room_id: RoomID, user_id: UserID, event_id: EventID) -> None:
        user = await u.User.get_by_mxid(user_id)

        portal = await po.Portal.get_by_mxid(room_id)
        if not portal:
            return

        if not user.relay_whitelisted:
            await portal.main_intent.kick_user(
                room_id, user.mxid, "You are not whitelisted on this KakaoTalk bridge."
            )
            return
        elif (
            not user.is_connected
            and not portal.has_relay
            and not self.config["bridge.allow_invites"]
        ):
            await portal.main_intent.kick_user(
                room_id, user.mxid, "You are not connected to this KakaoTalk bridge."
            )
            return

        await portal.handle_matrix_join(user)

    async def handle_leave(self, room_id: RoomID, user_id: UserID, event_id: EventID) -> None:
        portal = await po.Portal.get_by_mxid(room_id)
        if not portal:
            return

        user = await u.User.get_by_mxid(user_id, create=False)
        if not user:
            return

        await portal.handle_matrix_leave(user)

    @staticmethod
    async def handle_redaction(
        room_id: RoomID, user_id: UserID, event_id: EventID, redaction_event_id: EventID
    ) -> None:
        user = await u.User.get_by_mxid(user_id)
        if not user:
            return

        portal = await po.Portal.get_by_mxid(room_id)
        if not portal:
            return

        await portal.handle_matrix_redaction(user, event_id, redaction_event_id)

    """ TODO
    @classmethod
    async def handle_reaction(
        cls,
        room_id: RoomID,
        user_id: UserID,
        event_id: EventID,
        content: ReactionEventContent,
    ) -> None:
        if content.relates_to.rel_type != RelationType.ANNOTATION:
            cls.log.debug(
                f"Ignoring m.reaction event in {room_id} from {user_id} with unexpected "
                f"relation type {content.relates_to.rel_type}"
            )
            return
        user = await u.User.get_by_mxid(user_id)
        if not user or not user.is_connected:
            return

        portal = await po.Portal.get_by_mxid(room_id)
        if not portal:
            return

        await portal.handle_matrix_reaction(
            user, event_id, content.relates_to.event_id, content.relates_to.key
        )
    """

    async def handle_read_receipt(
        self,
        user: u.User,
        portal: po.Portal,
        event_id: EventID,
        data: SingleReceiptEventContent,
    ) -> None:
        if not user.is_connected:
            return
        message = await DBMessage.get_by_mxid(event_id, portal.mxid)
        if message:
            await user.client.mark_read(portal.channel_props, message.ktid)

    async def handle_ephemeral_event(
        self, evt: ReceiptEvent | Event
    ) -> None:
        if evt.type == EventType.RECEIPT:
            await self.handle_receipt(evt)

    async def handle_event(self, evt: Event) -> None:
        if evt.type == EventType.ROOM_REDACTION:
            evt: RedactionEvent
            await self.handle_redaction(evt.room_id, evt.sender, evt.redacts, evt.event_id)
        """ TODO
        elif evt.type == EventType.REACTION:
            evt: ReactionEvent
            await self.handle_reaction(evt.room_id, evt.sender, evt.event_id, evt.content)
        """

    async def handle_state_event(self, evt: StateEvent) -> None:
        if po.Portal.supports_state_event(evt.type):
            user = await u.User.get_by_mxid(evt.sender)
            if not user:
                return

            portal = await po.Portal.get_by_mxid(evt.room_id)
            if not portal:
                return

            await portal.handle_matrix_state_event(user, evt)