# mautrix-signal - A Matrix-Signal puppeting bridge
# Copyright (C) 2021 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 List, Union, TYPE_CHECKING

from mautrix.bridge import BaseMatrixHandler
from mautrix.types import (
    Event,
    ReactionEvent,
    StateEvent,
    RoomID,
    EventID,
    UserID,
    TypingEvent,
    ReactionEventContent,
    RelationType,
    EventType,
    ReceiptEvent,
    PresenceEvent,
    RedactionEvent,
    SingleReceiptEventContent,
)

from mautrix_signal.db.disappearing_message import DisappearingMessage

from .db import Message as DBMessage
from . import portal as po, user as u, signal as s

if TYPE_CHECKING:
    from .__main__ import SignalBridge


class MatrixHandler(BaseMatrixHandler):
    signal: "s.SignalHandler"

    def __init__(self, bridge: "SignalBridge") -> 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}"
        self.signal = bridge.signal

        super().__init__(bridge=bridge)

    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.update()
            await self.az.intent.send_notice(
                room_id, "This room has been marked as your Signal bridge notice room."
            )

    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)

    async def handle_join(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_join(user)

    @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:
            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
        )

    @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)

    async def handle_read_receipt(
        self,
        user: "u.User",
        portal: "po.Portal",
        event_id: EventID,
        data: SingleReceiptEventContent,
    ) -> None:
        await portal.handle_read_receipt(event_id, data)

        message = await DBMessage.get_by_mxid(event_id, portal.mxid)
        if not message:
            return

        user.log.trace(f"Sending read receipt for {message.timestamp} to {message.sender}")
        await self.signal.send_receipt(
            user.username, message.sender, timestamps=[message.timestamp], when=data.ts, read=True
        )

    async def handle_typing(self, room_id: RoomID, typing: List[UserID]) -> None:
        pass
        # portal = await po.Portal.get_by_mxid(room_id)
        # if not portal:
        #     return
        #
        # for user_id in typing:
        #     user = await u.User.get_by_mxid(user_id, create=False)
        #     if not user or not user.username:
        #         continue
        #     # TODO

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

    async def handle_ephemeral_event(
        self, evt: Union[ReceiptEvent, PresenceEvent, TypingEvent]
    ) -> None:
        if evt.type == EventType.TYPING:
            await self.handle_typing(evt.room_id, evt.content.user_ids)
        else:
            await super().handle_ephemeral_event(evt)

    async def handle_state_event(self, evt: StateEvent) -> None:
        if evt.type not in (EventType.ROOM_NAME, EventType.ROOM_AVATAR):
            return

        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

        if evt.type == EventType.ROOM_NAME:
            await portal.handle_matrix_name(user, evt.content.name)
        elif evt.type == EventType.ROOM_AVATAR:
            await portal.handle_matrix_avatar(user, evt.content.url)

    async def allow_message(self, user: "u.User") -> bool:
        return user.relay_whitelisted

    async def allow_bridging_message(self, user: "u.User", portal: "po.Portal") -> bool:
        return portal.has_relay or await user.is_logged_in()