# mautrix-instagram - A Matrix-Instagram 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, ClassVar, List, TYPE_CHECKING

from attr import dataclass
import asyncpg

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

fake_db = Database("") if TYPE_CHECKING else None


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

    thread_id: str
    receiver: int
    other_user_pk: Optional[int]
    mxid: Optional[RoomID]
    name: Optional[str]
    encrypted: bool

    async def insert(self) -> None:
        q = ("INSERT INTO portal (thread_id, receiver, other_user_pk, mxid, name, encrypted) "
             "VALUES ($1, $2, $3, $4, $5, $6)")
        await self.db.execute(q, self.thread_id, self.receiver, self.other_user_pk,
                              self.mxid, self.name, self.encrypted)

    async def update(self) -> None:
        q = ("UPDATE portal SET other_user_pk=$3, mxid=$4, name=$5, encrypted=$6 "
             "WHERE thread_id=$1 AND receiver=$2")
        await self.db.execute(q, self.thread_id, self.receiver, self.other_user_pk,
                              self.mxid, self.name, self.encrypted)

    @classmethod
    def _from_row(cls, row: asyncpg.Record) -> 'Portal':
        return cls(**row)

    @classmethod
    async def get_by_mxid(cls, mxid: RoomID) -> Optional['Portal']:
        q = ("SELECT thread_id, receiver, other_user_pk, mxid, name, encrypted "
             "FROM portal WHERE mxid=$1")
        row = await cls.db.fetchrow(q, mxid)
        if not row:
            return None
        return cls._from_row(row)

    @classmethod
    async def get_by_thread_id(cls, thread_id: str, receiver: int,
                               rec_must_match: bool = True) -> Optional['Portal']:
        q = ("SELECT thread_id, receiver, other_user_pk, mxid, name, encrypted "
             "FROM portal WHERE thread_id=$1 AND receiver=$2")
        if not rec_must_match:
            q = ("SELECT thread_id, receiver, other_user_pk, mxid, name, encrypted "
                 "FROM portal WHERE thread_id=$1 AND (receiver=$2 OR receiver=0)")
        row = await cls.db.fetchrow(q, thread_id, receiver)
        if not row:
            return None
        return cls._from_row(row)

    @classmethod
    async def find_private_chats_of(cls, receiver: int) -> List['Portal']:
        q = ("SELECT thread_id, receiver, other_user_pk, mxid, name, encrypted FROM portal "
             "WHERE receiver=$1 AND other_user_pk IS NOT NULL")
        rows = await cls.db.fetch(q, receiver)
        return [cls._from_row(row) for row in rows]

    @classmethod
    async def find_private_chats_with(cls, other_user: int) -> List['Portal']:
        q = ("SELECT thread_id, receiver, other_user_pk, mxid, name, encrypted FROM portal "
             "WHERE other_user_pk=$1")
        rows = await cls.db.fetch(q, other_user)
        return [cls._from_row(row) for row in rows]

    @classmethod
    async def all_with_room(cls) -> List['Portal']:
        q = ("SELECT thread_id, receiver, other_user_pk, mxid, name, encrypted FROM portal "
             'WHERE mxid IS NOT NULL')
        rows = await cls.db.fetch(q)
        return [cls._from_row(row) for row in rows]
