tic-tact-toc-player-started.java

    private void
            player_started_play
                ( ){

        int coordinates [ ] = null;
        int machine_row_open_for_win = -1 ;
        int machine_col_open_for_win = -1 ;
        int player_row_open_for_win = -1 ;
        int player_col_open_for_win = -1;

        if (!is_center_occupied ( ) ){
            machine_got_center = true;
            coordinates  = center_coordinates ( ); }

        if (machine_got_center && turn_count != 2 ){
            coordinates = where_a_player_might_win(id_machine);
            if (coordinates != null ){
                id_winner = id_machine; }
            else{
                coordinates = where_a_player_might_win(id_player);
                if (coordinates == null ){
                    machine_row_open_for_win = get_row_where_possibility_of_win (id_machine );
                    player_row_open_for_win = get_row_where_possibility_of_win (id_player );
                    player_col_open_for_win = get_col_where_possibility_of_win (id_player );
                    if (machine_row_open_for_win != -1 )
                        coordinates = get_any_free_coordinate_from_a_row(machine_row_open_for_win );
                    else if (player_row_open_for_win != -1 &&
                             player_col_open_for_win != -1 &&
                             player_moves [player_row_open_for_win ] [player_col_open_for_win ] == id_no_player ){
                        coordinates = new int [ ]{player_row_open_for_win , player_col_open_for_win }; }
                    else
                        coordinates = get_any_open_coordinate ( );}}}
        else if (!machine_got_center ){
            coordinates = where_a_player_might_win (id_machine );
            if (coordinates != null ){
                id_winner = id_machine; }
            else{
                coordinates = where_a_player_might_win (id_player );
                if (coordinates == null ){
                    machine_row_open_for_win = get_row_where_possibility_of_win(id_machine);
                    machine_col_open_for_win = get_row_where_possibility_of_win(id_machine);
                    if (is_there_a_free_corner( ) )
                        coordinates = get_random_free_corner( );
                    else if (machine_row_open_for_win != -1 )
                        coordinates = get_any_free_coordinate_from_a_row (machine_row_open_for_win );
                    else if (machine_col_open_for_win != -1 )
                        coordinates = get_any_free_coordinate_from_a_col (machine_col_open_for_win );
                    else
                        coordinates = get_any_open_coordinate( );}}}

        player_moves [coordinates [0 ]] [coordinates [1 ]] = id_machine;
        turn_machine = !turn_machine;
        turn_count++;
        invalidate ( );}