Connect4_Complete

package CC4PlayGround;

import java.util.Objects;
import java.util.Random;

public class CC4Playground {
    /*Global Variables*/
    String[][] board;
    Boolean winner;
    Boolean draw;
    int winningPlayer;
    int playerTurn;

    /*Constructor*/
    public CC4Playground(){
        winningPlayer = 0;
        draw = false;
        playerTurn = 1;
        board = new String[6][7];
        newGameBoard();
        displayBoard();
    }

    /*provide a better look for the board*/
    private void newGameBoard(){
        for(int i = 0; i < board.length; i++){
            for(int j = 0; j < board[0].length; j++){
                board[i][j] = " - ";
            }
        }
    }

    private void displayBoard(){
        System.out.println(" ");
        System.out.println(" *** Connect 4 *** ");
        System.out.println(" ");
        System.out.println(" 0  1  2  3  4  5  6");
        for(int i = 0; i < board.length; i++){
            for(int j = 0; j < board[0].length; j++){
                if( board[i][j].length() == 1)
                    System.out.print(" " + board[i][j]+ " ");
                else
                    System.out.print(board[i][j]);
            }
            System.out.println();
        }
        System.out.println();
    }

    /*the column is full*/
    private boolean isColumnFull(int col){
        return getNextAvailableSlot(col) == -1;
    }

    /*return the next available row pos of a given column*/
    private int getNextAvailableSlot(int col){

        int rows = board.length;
        int cols = board[0].length;

        for(int pos = rows-1; pos >= 0; --pos) {
            if(board[pos][col] == " - " ){
                return pos;

            }

        }
        return -1;
    }

    /* swaps turn for current player */
    private void swapPlayerTurn(){
        if(playerTurn == 1){
            playerTurn = 2;
        } else {
            playerTurn = 1;
        }
    }
    private void placePiece(){

      switch(playerTurn){
          case 1:
            System.out.println("Player X " + playerTurn + " please select which col to place your piece (1-7)");
            String input = new java.util.Scanner(System.in).nextLine();
            int colChoice = Integer.parseInt(input) - 1;
              String pieceToPlace = "X";
              // todo ohne isColumnFull prüfen geht der Spiel unendlich
              if(!isColumnFull(colChoice))
                board[getNextAvailableSlot(colChoice)][colChoice] = pieceToPlace;
              displayBoard();
              //decideWinner();
              swapPlayerTurn();
              break;
          case 2:
              System.out.println("Player O  " + playerTurn + " places the piece");
              Random rdm = new Random();
              colChoice = rdm.nextInt(6)+1;
              pieceToPlace = "O";

              if(!isColumnFull(colChoice))
                board[getNextAvailableSlot(colChoice)][colChoice] = pieceToPlace;

              displayBoard();
              swapPlayerTurn();
              break;
          default:
              System.out.println("no valid turn");
              break;
              //swapPlayerTurn();
      }
      //decideWinner();
      //decideWinner(board);

    }

    private final int MATCHES = 4;

    private boolean didWinleft(String player) {
        int rows = board.length;
        int cols = board[0].length;

        for(int i = 0; i < rows; i++){
            for(int j = 0; j <= cols-MATCHES; j++){

                if( board[i][j] == player)
                {
                    boolean ab = board[i][j] == board[i][j+1];
                    boolean cd = board[i][j+1] == board[i][j+2];
                    boolean de = board[i][j+2] == board[i][j+3];

                    if(ab && cd && de){
                        return true;
                    }
                }
            }
        }

        return false;
    }

    private boolean didWinup(String player) {
        int rows = board.length;
        int cols = board[0].length;

        for(int i = 0; i <= rows-MATCHES; i++){
            for(int j = 0; j < cols; j++){

                if( board[i][j] == player)
                {
                    boolean ab = board[i][j] == board[i+1][j];
                    boolean cd = board[i+1][j] == board[i+2][j];
                    boolean de = board[i+2][j] == board[i+3][j];

                    if(ab && cd && de){
                        return true;
                    }
                }
            }
        }

        return false;
    }

    private boolean didWinleftup(String player) {
        int rows = board.length;
        int cols = board[0].length;

        for(int i = 0; i <= rows-MATCHES; i++){
            for(int j = 0; j <= cols-MATCHES; j++){

                if( board[i][j] == player)
                {
                    boolean ab = board[i][j] == board[i+1][j+1];
                    boolean cd = board[i+1][j+1] == board[i+2][j+2];
                    boolean de = board[i+2][j+2] == board[i+3][j+3];

                    if(ab && cd && de){
                        return true;
                    }
                }
            }
        }

        return false;
    }

    private boolean didWinRightup(String player) {
        int rows = board.length;
        int cols = board[0].length;

        for(int i = rows-MATCHES; i >= 0; i--){
            for(int j = cols-MATCHES; j >= 0; j--){

                if( board[i][j] == player)
                {
                    boolean ab = board[i][j] == board[i+1][j+1];
                    boolean cd = board[i+1][j+1] == board[i+2][j+2];
                    boolean de = board[i+2][j+2] == board[i+3][j+3];

                    if(ab && cd && de){
                        return true;
                    }
                }
            }
        }

        return false;
    }

    public void playGame(){
        while(winningPlayer == 0){

            placePiece();

            String[] players = new String[]{"X", "O"};

            for(String player : players){
                boolean didWin = didWinRightup(player);
                didWin |= didWinleftup(player);
                didWin |= didWinup(player);
                didWin |= didWinleft(player);

                if(didWin){
                    System.out.println("gewonnen " + player);
                }
            }
        }
    }

    public static void main(String[] args) {
        CC4Playground main = new CC4Playground();
        main.playGame();

    }
}