CIiP-WS-2020-2021-Projektarbeit_Multi-Chess/fh.fd.ci.server/src/main/java/de/fd/fh/server/game/GameService.java

package de.fd.fh.server.game;

import de.fd.fh.server.user.UserId;
import lombok.RequiredArgsConstructor;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

@RequiredArgsConstructor
public class GameService
{
    private final GameRepository repository;

    public GameId createGame(final Game game)
    {
        return (GameId) repository.save(game).getId();
    }

    public GameId createGame(final UserId blackUser, final UserId whiteUser)
    {
        final Set<Field> fields = initFields(blackUser, whiteUser);

        final Game game = new Game(null, whiteUser, blackUser, whiteUser, fields, null);

        return (GameId) repository.save(game).getId();
    }

    public Game findGameById(final GameId gameId)
    {
        return repository.findByGameId(gameId);
    }

    public List<Game> findRunningGamesOfUser(final UserId userId)
    {
        return repository.findRunningGamesOfPlayer(userId);
    }

    private Set<Field> initFields(UserId blackUser, UserId whiteUser)
    {
        final Set<Field> fields = new HashSet<>();
        for (int x = 0; x < 8; x++)
        {
            for (int y = 0; y < 8; y++)
            {
                fields.add(new Field(x, y, getColor(x, y) , getFigure(x, y, whiteUser, blackUser)));
            }
        }
        return fields;
    }

    private Field.Color getColor(final int x, final int y)
    {
        return (x + y) % 2 != 1 ? Field.Color.WHITE : Field.Color.BLACK;
    }

    private Figure getFigure(final int x, final int y, final UserId whitePlayer, final UserId blackPlayer)
    {
        if (x == 0)
        {
            return getFigureOfGroundLevel(y, whitePlayer);
        }

        if (x == 1)
        {
            return new Figure(Figure.Type.PAWN, whitePlayer);
        }

        if (x == 7)
        {
            return getFigureOfGroundLevel(y, blackPlayer);
        }

        if (x == 6)
        {
            return new Figure(Figure.Type.PAWN, blackPlayer);
        }

        return null;
    }

    private Figure getFigureOfGroundLevel(final int y, final UserId player)
    {
        if (y == 0 || y == 7)
        {
            return new Figure(Figure.Type.ROOK, player);
        }

        if (y == 1 || y == 6)
        {
            return new Figure(Figure.Type.KNIGHT, player);
        }

        if (y == 2 || y == 5)
        {
            return new Figure(Figure.Type.BISHOP, player);
        }

        if (y == 3)
        {
            return new Figure(Figure.Type.QUEEN, player);
        }

        if (y == 4)
        {
            return new Figure(Figure.Type.KING, player);
        }
        return null;
    }
}