import json
import hra.config as config
import hra.db as db
from hra.util import hash_passwd
from datetime import datetime
from sqlalchemy import exc, update

class DuplicitMakeStep(Exception):
    pass

def game_step(game_id: int):
    ses = db.get_session()

    ses.expire_all()
    game = ses.query(db.Game).filter_by(game_id=game_id).with_for_update().one_or_none()
    assert game is not None
    time = datetime.now()
    if game.working_on_next_state:
        ses.commit()
        raise DuplicitMakeStep()
    game.working_on_next_state = True
    ses.commit()

    old_round_id = game.current_round
    new_round_id = old_round_id + 1
    old_state = ses.query(db.State).filter_by(game_id=game.game_id, round=old_round_id).one_or_none().get_state()

    moves = [None for _ in range(game.teams_count)]
    for i in ses.query(db.Move).filter_by(game_id=game.game_id, round=old_round_id).all():
        moves[i.team_id] = i.get_move()

    ses.commit()

    x, points = game.get_logic().step(old_state, moves, old_round_id)

    new_state = db.State(game_id=game.game_id, round=new_round_id, state=db.new_big_data(x), create_time=time)
    ses.add(new_state)

    ses.expire_all()
    game = ses.query(db.Game).filter_by(game_id=game_id).with_for_update().one_or_none()
    assert game is not None
    assert game.working_on_next_state
    game.current_round = new_round_id
    game.working_on_next_state = False
    ses.commit()

def game_restore_broken(game_id: int) -> None:
    ses = db.get_session()
    ses.expire_all()
    game = ses.query(db.Game).filter_by(game_id=game_id).with_for_update().one_or_none()
    game.working_on_next_state = False
    ses.commit()


def create_game(mode, teams_count, configuration={}, test_for=None, name=None, step_mode=db.StepMode.none):
    ses = db.get_session()

    g = db.Game(game_mode=mode, configuration=db.new_big_data(configuration), teams_count=teams_count, name=name, step_mode=step_mode)

    ses.add(g)
    ses.flush()

    g.lock()

    s = db.State(game_id=g.game_id, round=0, state=db.new_big_data(g.get_logic().zero_state()), create_time=datetime.now())
    ses.add(s)


    if test_for is not None:
        for i in range(teams_count):
            t = db.Team(team_id=i, game_id=g.game_id, name=f"test_{i}", user_id=test_for.id)
            ses.add(t)
    else:
        for i in range(teams_count):
            t = db.Team(team_id=i, game_id=g.game_id, name="")
            ses.add(t)

    g.current_round = 0
    g.working_on_next_state = False

    return g

def create_test_game(user):
    mode = "occupy"
    teams_count = 4
    configuration = {
        "teams_width": 2,
        "teams_height": 2,
        "width_per_team": 10,
        "height_per_team": 10,
        "hills": [
            ".xx....x..",
            ".xxx...xx.",
            "...x......",
            ".......xx.",
            ".......xx.",
            ".......x..",
            "..........",
            "..........",
            "..........",
            "..........",
        ],
    }
    return create_game(mode=mode, teams_count=teams_count, configuration=configuration, test_for=user, name=f"Testovací hra uživatele {user.username}", step_mode=db.StepMode.user)

class UsernameExist(Exception):
    pass

def create_user(username, passwd, org=False, test_game=True):
    u = db.User(org=org, username=username, passwd=hash_passwd(passwd))
    u.gen_token()
    try:
           db.get_session().add(u)
           db.get_session().flush()
    except exc.IntegrityError:
        raise UsernameExist()

    if test_game:
        create_test_game(u)
    return u