from typing import Optional, List
from sqlalchemy import Table, Column, text, UniqueConstraint
from sqlalchemy.dialects import mysql
from sqlalchemy.types import Integer, String, TIMESTAMP, JSON
from sqlalchemy.sql import func
from sqlalchemy.sql.schema import ForeignKey
from sqlalchemy.dialects.mysql import insert
from sqlalchemy.sql import func, select
from sqlalchemy.engine import Row
import bcrypt

from core.data.schema.base import BaseData, metadata

aime_user = Table(
    "aime_user",
    metadata,
    Column("id", Integer, nullable=False, primary_key=True, autoincrement=True),
    Column("username", String(25), unique=True),
    Column("email", String(255), unique=True),
    Column("password", String(255)),
    Column("permissions", Integer),
    Column("created_date", TIMESTAMP, server_default=func.now()),
    Column("last_login_date", TIMESTAMP, onupdate=func.now()),
    Column("suspend_expire_time", TIMESTAMP),
    mysql_charset="utf8mb4",
)

game_locks = Table(
    "aime_user_game_locks",
    metadata,
    Column("id", Integer, nullable=False, primary_key=True, autoincrement=True),
    Column("user", ForeignKey("aime_user.id", ondelete="cascade", onupdate="cascade"), nullable=False),
    Column("game", String(4), nullable=False),
    Column("expires_at", TIMESTAMP, server_default=func.date_add(func.now(), text("INTERVAL 15 MINUTE"))),
    Column("extra", JSON),
    UniqueConstraint("user", "game", name="aime_user_title_locks"),
    mysql_charset="utf8mb4",
)

class UserData(BaseData):
    async def create_user(
        self,
        id: int = None,
        username: str = None,
        email: str = None,
        password: str = None,
        permission: int = 1,
    ) -> Optional[int]:
        if id is None:
            sql = insert(aime_user).values(
                username=username,
                email=email,
                password=password,
                permissions=permission,
            )
        else:
            sql = insert(aime_user).values(
                id=id,
                username=username,
                email=email,
                password=password,
                permissions=permission,
            )

        conflict = sql.on_duplicate_key_update(
            username=username, email=email, password=password, permissions=permission
        )

        result = await self.execute(conflict)
        if result is None:
            return None
        return result.lastrowid

    async def get_user(self, user_id: int) -> Optional[Row]:
        sql = select(aime_user).where(aime_user.c.id == user_id)
        result = await self.execute(sql)
        if result is None:
            return False
        return result.fetchone()

    async def check_password(self, user_id: int, passwd: bytes = None) -> bool:
        usr = await self.get_user(user_id)
        if usr is None:
            return False

        if usr["password"] is None:
            return False
        
        if passwd is None or not passwd:
            return False

        return bcrypt.checkpw(passwd, usr["password"].encode())

    async def delete_user(self, user_id: int) -> None:
        sql = aime_user.delete(aime_user.c.id == user_id)

        result = await self.execute(sql)
        if result is None:
            self.logger.error(f"Failed to delete user with id {user_id}")

    async def get_unregistered_users(self) -> List[Row]:
        """
        Returns a list of users who have not registered with the webui. They may or may not have cards.
        """
        sql = select(aime_user).where(aime_user.c.password == None)

        result = await self.execute(sql)
        if result is None:
            return None
        return result.fetchall()

    async def find_user_by_email(self, email: str) -> Row:
        sql = select(aime_user).where(aime_user.c.email == email)
        result = await self.execute(sql)
        if result is None:
            return False
        return result.fetchone()

    async def find_user_by_username(self, username: str) -> List[Row]:
        sql = aime_user.select(aime_user.c.username.like(f"%{username}%"))
        result = await self.execute(sql)
        if result is None:
            return False
        return result.fetchall()

    async def change_password(self, user_id: int, new_passwd: str) -> bool:
        sql = aime_user.update(aime_user.c.id == user_id).values(password = new_passwd)

        result = await self.execute(sql)
        return result is not None

    async def change_username(self, user_id: int, new_name: str) -> bool:
        sql = aime_user.update(aime_user.c.id == user_id).values(username = new_name)

        result = await self.execute(sql)
        return result is not None

    async def get_user_by_username(self, username: str) -> Optional[Row]:
        result = await self.execute(aime_user.select(aime_user.c.username == username))
        if result:
            return result.fetchone()
    
    async def check_lock_for_game(self, user_id: int, game: str):
        sql = game_locks.select(
            (game_locks.c.user == user_id)
            & (game_locks.c.game == game)
            & (func.timestampdiff(text("SECOND"), func.now(), game_locks.c.expires_at) > 0))
        result = await self.execute(sql)

        if result:
            return result.fetchone()
        
        return None

    async def acquire_lock_for_game(self, user_id: int, game: str, extra: dict | None = None):
        result = await self.check_lock_for_game(user_id, game)

        if result is not None:
            return result
        
        sql = (
            insert(game_locks)
            .values(user=user_id, game=game, extra=extra)
            .on_duplicate_key_update(
                expires_at=func.date_add(func.now(), text("INTERVAL 15 MINUTE")),
                extra=extra,
            )
        )
        
        await self.execute(sql)

        return None

    async def release_lock_for_game(self, user_id: int, game: str):
        sql = game_locks.delete((game_locks.c.user == user_id) & (game_locks.c.game == game))

        await self.execute(sql)

    async def extend_lock_for_game(self, user_id: int, game: str):
        sql = game_locks.update().where(user=user_id, game=game).values(expires_at=func.date_add(func.now(), text("INTERVAL 15 MINUTE")))

        await self.execute(sql)