import copy

from sqlalchemy import Table, Column, UniqueConstraint  # type: ignore
from sqlalchemy.types import String, Integer, JSON  # type: ignore
from sqlalchemy.dialects.mysql import BIGINT as BigInteger  # type: ignore
from typing import Optional, Dict, List, Tuple, Any

from bemani.common import ValidatedDict, Time
from bemani.data.mysql.base import BaseData, metadata
from bemani.data.types import UserID

"""
Table for storing logistical information about a player who's session is
live. Mostly, this is used to store IP addresses and such for players that
could potentially match.
"""
playsession = Table(  # type: ignore
    'playsession',
    metadata,
    Column('id', Integer, nullable=False, primary_key=True),
    Column('game', String(32), nullable=False),
    Column('version', Integer, nullable=False),
    Column('userid', BigInteger(unsigned=True), nullable=False),
    Column('time', Integer, nullable=False, index=True),
    Column('data', JSON, nullable=False),
    UniqueConstraint('game', 'version', 'userid', name='game_version_userid'),
    mysql_charset='utf8mb4',
)

"""
Table for storing open lobbies for matching between games.
"""
lobby = Table(  # type: ignore
    'lobby',
    metadata,
    Column('id', Integer, nullable=False, primary_key=True),
    Column('game', String(32), nullable=False),
    Column('version', Integer, nullable=False),
    Column('userid', BigInteger(unsigned=True), nullable=False),
    Column('time', Integer, nullable=False, index=True),
    Column('data', JSON, nullable=False),
    UniqueConstraint('game', 'version', 'userid', name='game_version_userid'),
    mysql_charset='utf8mb4',
)


class LobbyData(BaseData):

    def get_play_session_info(self, game: str, version: int, userid: UserID) -> Optional[ValidatedDict]:
        """
        Given a game, version and a user ID, look up play session information for that user.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.
            userid - Integer identifying a user, as possibly looked up by UserData.

        Returns:
            A dictionary representing play session info stored by a game class, or None
            if there is no active session for this game/version/user. The dictionary will
            always contain an 'id' field which is the play session ID, and a 'time' field
            which represents the timestamp when the play session began.
        """
        sql = (
            "SELECT id, time, data FROM playsession "
            "WHERE game = :game AND version = :version AND userid = :userid "
            "AND time > :time"
        )
        cursor = self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'userid': userid,
                'time': Time.now() - Time.SECONDS_IN_HOUR,
            },
        )

        if cursor.rowcount != 1:
            # Settings doesn't exist
            return None

        result = cursor.fetchone()
        data = ValidatedDict(self.deserialize(result['data']))
        data['id'] = result['id']
        data['time'] = result['time']
        return data

    def get_all_play_session_infos(self, game: str, version: int) -> List[Tuple[UserID, ValidatedDict]]:
        """
        Given a game and version, look up all play session information.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.

        Returns:
            A list of Tuples, consisting of a UserID and the dictionary that would be
            returned for that user if get_play_session_info() was called for that user.
        """
        sql = (
            "SELECT id, time, userid, data FROM playsession "
            "WHERE game = :game AND version = :version "
            "AND time > :time"
        )
        cursor = self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'time': Time.now() - Time.SECONDS_IN_HOUR,
            },
        )

        ret = []
        for result in cursor.fetchall():
            data = ValidatedDict(self.deserialize(result['data']))
            data['id'] = result['id']
            data['time'] = result['time']
            ret.append((UserID(result['userid']), data))
        return ret

    def put_play_session_info(self, game: str, version: int, userid: UserID, data: Dict[str, Any]) -> None:
        """
        Given a game, version and a user ID, save play session information for that user.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.
            userid - Integer identifying a user.
            data - A dictionary of play session information to store.
        """
        data = copy.deepcopy(data)
        if 'id' in data:
            del data['id']

        # Add json to player session
        sql = (
            "INSERT INTO playsession (game, version, userid, time, data) " +
            "VALUES (:game, :version, :userid, :time, :data) " +
            "ON DUPLICATE KEY UPDATE time=VALUES(time), data=VALUES(data)"
        )
        self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'userid': userid,
                'time': Time.now(),
                'data': self.serialize(data),
            },
        )

    def destroy_play_session_info(self, game: str, version: int, userid: UserID) -> None:
        """
        Given a game, version and a user ID, throw away session info for that play session.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.
            userid - Integer identifying a user, as possibly looked up by UserData.
        """
        # Kill this play session
        sql = (
            "DELETE FROM playsession WHERE game = :game AND version = :version AND userid = :userid"
        )
        self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'userid': userid,
            },
        )
        # Prune any orphaned lobbies too
        sql = "DELETE FROM playsession WHERE time <= :time"
        self.execute(sql, {'time': Time.now() - Time.SECONDS_IN_HOUR})

    def get_lobby(self, game: str, version: int, userid: UserID) -> Optional[ValidatedDict]:
        """
        Given a game, version and a user ID, look up lobby information for that user.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.
            userid - Integer identifying a user, as possibly looked up by UserData.

        Returns:
            A dictionary representing lobby info stored by a game class, or None
            if there is no active session for this game/version/user. The dictionary will
            always contain an 'id' field which is the lobby ID, and a 'time' field representing
            the timestamp the lobby was created.
        """
        sql = (
            "SELECT id, time, data FROM lobby "
            "WHERE game = :game AND version = :version AND userid = :userid "
            "AND time > :time"
        )
        cursor = self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'userid': userid,
                'time': Time.now() - Time.SECONDS_IN_HOUR,
            },
        )

        if cursor.rowcount != 1:
            # Settings doesn't exist
            return None

        result = cursor.fetchone()
        data = ValidatedDict(self.deserialize(result['data']))
        data['id'] = result['id']
        data['time'] = result['time']
        return data

    def get_all_lobbies(self, game: str, version: int) -> List[Tuple[UserID, ValidatedDict]]:
        """
        Given a game and version, look up all active lobbies.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.

        Returns:
            A list of dictionaries representing lobby info stored by a game class.
        """
        sql = (
            "SELECT userid, id, data FROM lobby "
            "WHERE game = :game AND version = :version AND time > :time"
        )
        cursor = self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'time': Time.now() - Time.SECONDS_IN_HOUR,
            },
        )

        ret = []
        for result in cursor.fetchall():
            data = ValidatedDict(self.deserialize(result['data']))
            data['id'] = result['id']
            ret.append((UserID(result['userid']), data))
        return ret

    def put_lobby(self, game: str, version: int, userid: UserID, data: Dict[str, Any]) -> None:
        """
        Given a game, version and a user ID, save lobby information for that user.

        Parameters:
            game - String identifying a game series.
            version - Integer identifying the version of the game in the series.
            userid - Integer identifying a user.
            data - A dictionary of lobby information to store.
        """
        data = copy.deepcopy(data)
        if 'id' in data:
            del data['id']

        # Add json to lobby
        sql = (
            "INSERT INTO lobby (game, version, userid, time, data) " +
            "VALUES (:game, :version, :userid, :time, :data) " +
            "ON DUPLICATE KEY UPDATE time=VALUES(time), data=VALUES(data)"
        )
        self.execute(
            sql,
            {
                'game': game,
                'version': version,
                'userid': userid,
                'time': Time.now(),
                'data': self.serialize(data),
            },
        )

    def destroy_lobby(self, lobbyid: int) -> None:
        """
        Given a lobby ID, destroy the lobby. The lobby ID can be obtained by reading
        the 'id' field of the get_lobby response.

        Parameters:
            lobbyid: Integer identifying a lobby.
        """
        # Delete this lobby
        sql = "DELETE FROM lobby WHERE id = :id"
        self.execute(sql, {'id': lobbyid})
        # Prune any orphaned lobbies too
        sql = "DELETE FROM lobby WHERE time <= :time"
        self.execute(sql, {'time': Time.now() - Time.SECONDS_IN_HOUR})