from __future__ import annotations

from games.models import GameModel

from django.contrib.auth.models import User
from django.db.models import CASCADE
from django.db import models


class TournamentModel(models.Model):

    name = models.CharField(max_length = 100)
    nb_participants = models.IntegerField()
    round = models.IntegerField()
    started = models.BooleanField(default = False)
    finished = models.BooleanField(default = False)
    winner = models.ForeignKey(User, on_delete=CASCADE, blank=True, null=True)

    def _register_participant(self, participant: User) -> None:
        TournamentParticipantModel(participant=participant, tournament=self).save()

    def start(self, participants: list[User]) -> None:

        games: list[GameModel] = []

        self.started = True

        for player in participants:
            self._register_participant(player)

        for (participant1, participant2) in zip(participants[0::2], participants[1::2]):
            game: GameModel = self.create_game([participant1, participant2], round=1)
            games.append(game)

        self.save()

        return games

    def create_game(self, participants: list[User], round: int) -> GameModel:

        if (self.started == False):
            return None

        if (len(participants) != 2):
            return None

        from games.models import GameModel

        game: GameModel = GameModel().create(participants)

        TournamentGameModel(tournament=self, game=game, round=round).save()

        return game

    def get_games(self) -> list[GameModel]:
        return [games for games in self.get_games_by_round(i for i in range(1, self.round))]
    
    def get_games_by_round(self, round: int) -> list[GameModel]:
        return [tournament_game.game for tournament_game in TournamentGameModel.objects.filter(tournament=self, round=round)]
        
    def get_players_by_round(self, round: int) -> list[User]:
        return [game.get_players() for game in self.get_games_by_round(round)]
    
    def get_winners_by_round(self, round: int) -> list[User]:
        return [game.winner for game in self.get_games_by_round(round)]
        
    def get_participants(self) -> list[TournamentParticipantModel]:
        return TournamentParticipantModel.objects.filter(tournament=self.pk)

    def get_state(self) -> str:
        return ("waiting to start", "in progress", "finish")[self.started + self.finished]
    
    def is_participanting(self, profile: User) -> bool:
        return TournamentParticipantModel.objects.filter(participant=profile, tournament=self).exists()

class TournamentParticipantModel(models.Model):
    participant = models.ForeignKey(User, on_delete=CASCADE)
    tournament = models.ForeignKey(TournamentModel, on_delete=CASCADE)
    
class TournamentGameModel(models.Model):

    tournament = models.ForeignKey(TournamentModel, on_delete=CASCADE, null=True, blank=True)
    round = models.IntegerField()
    game = models.ForeignKey(GameModel, on_delete=CASCADE)