package laboratoire4;

public class PusherBoard {

    private Pawn[][] board;

    public PusherBoard() {
        this.newGame();
    }

    public void newGame(){
        this.board = new Pawn[8][8];

        for(int i = 0 ;i<board.length;i++){
            board[7][i] = Pawn.B_PUSHER;
        }

        for(int i = 0 ;i<board.length;i++){
            board[6][i] = Pawn.B_PUSHED;
        }

        for(int i = 0 ;i<board.length;i++){
            board[1][i] = Pawn.R_PUSHED;
        }

        for(int i = 0 ;i<board.length;i++){
            board[0][i] = Pawn.R_PUSHER;
        }
    }

    public int move (String move){
        //FORMAT ex : D2-D3
        String[] split = move.split("-");

        return move(split[0],split[1]);
    }

    public int move (String from, String to){
        //FORMAT ex : from {D2}, to {D3}
        int from_col = (int) from.charAt(0) - 65;
        int from_row = Integer.parseInt(String.valueOf(from.charAt(1)))-1;
        int to_col = (int) to.charAt(0) - 65;
        int to_row = Integer.parseInt(String.valueOf(to.charAt(1)))-1;

        return move(from_col, from_row, to_col, to_row);
    }

    public int move(int from_col, int from_row, int to_col, int to_row){
        //FORMAT ex : from_col {3}, from_row {2}, to_col {3}, to_row {3}

        //System.out.println("Move :" + from_col+""+from_row + "-"+ to_col+""+to_row);
        //System.out.println("Move is valid : " + isValid(from_col,from_row,to_col,to_row));

        if(isValid(from_col,from_row,to_col,to_row)){
            Pawn pawn = this.getBoard()[from_row][from_col];
            //System.out.println("Pawn to move : " + pawn);
            this.getBoard()[from_row][from_col] = null;
            this.getBoard()[to_row][to_col] = pawn;
        }

        return -1;
    }


    private boolean isValid(int from_col, int from_row, int to_col, int to_row){

        Pawn[][] board = this.getBoard();

        //out of bound?
        if((from_col >7 || from_col<0)||((from_row >7 || from_row<0))||((to_col >7 || to_col<0))||((to_row >7 || to_row<0))) return false;

        //no pawn to move?
        Pawn pawnToMove = board[from_row][from_col];
        if(pawnToMove == null) return false;

        //Pawn at destination is our own pawn?
        Pawn destination = board[to_row][to_col];
        char source_color = pawnToMove.name().charAt(0);
        if(destination != null){
            char destination_color = destination.name().charAt(0);

            if(source_color == destination_color) return false;
        }

        //Pawn goes back? or move is in valid range?
        if(source_color == 'R'){
            if(from_row>to_row) return false;
            if(from_row+1 != to_row) return false;
        }else if(source_color == 'B'){
            if(from_row<to_row) return false;
            if(from_row-1 != to_row) return false;
        }

        //PUSHED is in front a PUSHER?
        if(pawnToMove.equals(Pawn.B_PUSHED)){
            if(from_col+1==to_col){
                if(board[from_row+1][from_col+1] != Pawn.B_PUSHER) return false;
            }else if(from_col-1==to_col){
                if(board[from_row-1][from_col+1] != Pawn.B_PUSHER) return false;
            }else if(from_col==to_col){
                if(board[from_row+1][from_col] != Pawn.B_PUSHER) return false;
            }
        }else if(pawnToMove.equals(Pawn.R_PUSHED)){
            if(from_col+1 == to_col){
                if(board[from_row+1][from_col-1] != Pawn.R_PUSHER) return false;
            }else if(from_col-1 == to_col){
                if(board[from_row-1][from_col-1] != Pawn.R_PUSHER) return false;
            }else if(from_col == to_col){
                if(board[from_row-1][from_col] != Pawn.R_PUSHER) return false;
            }
        }
        
        return true;
    }

    public Pawn[][] getBoard() {
        return board;
    }

    public void printBoard(){

        for(int i=7; i>=0; i--){
            for (int j = 0 ; j < this.board.length; j++){
                if(this.board[i][j] != null){
                    System.out.print(this.board[i][j] + " | ");
                }else{
                    System.out.print("         | ");
                }
            }
            System.out.println();
            System.out.println("----------------------------------------------------------------------------------------");
        }
    }
}