# mautrix-line - A very hacky Matrix-LINE bridge based on using LINE's Chrome Store Extension in Puppeteer
# Copyright (C) 2021 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 typing import Optional, ClassVar, Dict, TYPE_CHECKING

from attr import dataclass

from mautrix.types import RoomID, EventID
from mautrix.util.async_db import Database

fake_db = Database("") if TYPE_CHECKING else None


@dataclass
class Message:
    db: ClassVar[Database] = fake_db

    mxid: EventID
    mx_room: RoomID
    mid: int
    chat_id: int

    async def insert(self) -> None:
        q = "INSERT INTO message (mxid, mx_room, mid, chat_id) VALUES ($1, $2, $3, $4)"
        await self.db.execute(q, self.mxid, self.mx_room, self.mid, self.chat_id)

    async def delete(self) -> None:
        q = "DELETE FROM message WHERE mid=$1"
        await self.db.execute(q, self.mid)

    @classmethod
    async def delete_all(cls, room_id: RoomID) -> None:
        await cls.db.execute("DELETE FROM message WHERE mx_room=$1", room_id)

    @classmethod
    async def get_max_mid(cls, room_id: RoomID) -> int:
        return await cls.db.fetchval("SELECT MAX(mid) FROM message WHERE mx_room=$1", room_id)

    @classmethod
    async def get_max_mids(cls) -> Dict[int, int]:
        rows = await cls.db.fetch("SELECT chat_id, MAX(mid) AS max_mid "
                                  "FROM message GROUP BY chat_id")
        data = {}
        for row in rows:
            data[row["chat_id"]] = row["max_mid"]
        return data

    @classmethod
    async def get_by_mxid(cls, mxid: EventID, mx_room: RoomID) -> Optional['Message']:
        row = await cls.db.fetchrow("SELECT mxid, mx_room, mid, chat_id "
                                    "FROM message WHERE mxid=$1 AND mx_room=$2", mxid, mx_room)
        if not row:
            return None
        return cls(**row)

    @classmethod
    async def get_by_mid(cls, mid: int) -> Optional['Message']:
        row = await cls.db.fetchrow("SELECT mxid, mx_room, mid, chat_id FROM message WHERE mid=$1",
                                    mid)
        if not row:
            return None
        return cls(**row)