SoftUni java Advanced Exam 02.Snake

package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int size = Integer.parseInt(sc.nextLine());

        String[][] matrix = new String[size][size];

        for (int row = 0; row < size; row++) {
            String[] arr = sc.nextLine().split("");
            matrix[row] = arr;
        }
        int food = 0;

        String command = sc.nextLine();
        int snakeRow = 0;
        int snakeCol = 0;
        while (food < 10) {

            for (int rows = 0; rows < matrix.length; rows++) {
                for (int cols = 0; cols < matrix[rows].length; cols++) {
                    if (matrix[rows][cols].equals("S")) {
                        snakeRow = rows;
                        snakeCol = cols;
                    }
                }
            }
            switch (command) {
                case "up":
                    if (snakeRow > 0) {
                        //check if food
                        if (matrix[snakeRow - 1][snakeCol].equals("*")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow - 1][snakeCol] = "S";
                            snakeRow -= 1;
                            food += 1;
                            break;
                        }
                        if (matrix[snakeRow - 1][snakeCol].equals("B")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow - 1][snakeCol] = ".";
                            for (int rows = 0; rows < matrix.length; rows++) {
                                for (int cols = 0; cols < matrix[rows].length; cols++) {
                                    if (matrix[rows][cols].equals("B")) {
                                        matrix[rows][cols] = "S";
                                        snakeRow = rows;
                                        snakeCol = cols;
                                    }
                                }
                            }
                        } else {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow - 1][snakeCol] = "S";
                            snakeRow -= 1;
                        }
                    } else {
                        System.out.println("Game over!");
                        System.out.println(String.format("Food eaten: %d", food));
                        matrix[snakeRow][snakeCol] = ".";
                        for (int rows = 0; rows < matrix.length; rows++) {
                            for (int cols = 0; cols < matrix[rows].length; cols++) {
                                System.out.print(matrix[rows][cols]);
                            }
                            System.out.println();
                        }
                    }
                    break;
                case "down":
                    if (snakeRow < matrix.length - 1) {
                        //check if food
                        if (matrix[snakeRow + 1][snakeCol].equals("*")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow + 1][snakeCol] = "S";
                            snakeRow += 1;
                            food += 1;
                            break;
                        }
                        if (matrix[snakeRow + 1][snakeCol].equals("B")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow + 1][snakeCol] = ".";
                            for (int rows = 0; rows < matrix.length; rows++) {
                                for (int cols = 0; cols < matrix[rows].length; cols++) {
                                    if (matrix[rows][cols].equals("B")) {
                                        matrix[rows][cols] = "S";
                                        snakeRow = rows;
                                        snakeCol = cols;
                                    }
                                }
                            }
                        } else {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow + 1][snakeCol] = "S";
                            snakeRow += 1;
                        }
                    } else {
                        System.out.println("Game over!");
                        System.out.println(String.format("Food eaten: %d", food));
                        matrix[snakeRow][snakeCol] = ".";
                        for (int rows = 0; rows < matrix.length; rows++) {
                            for (int cols = 0; cols < matrix[rows].length; cols++) {
                                System.out.print(matrix[rows][cols]);
                            }
                            System.out.println();
                        }
                    }
                    break;
                case "left":
                    if (snakeCol > 0) {
                        //check if food
                        if (matrix[snakeRow][snakeCol - 1].equals("*")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow][snakeCol - 1] = "S";
                            snakeCol -= 1;
                            food += 1;
                            break;
                        }
                        if (matrix[snakeRow][snakeCol - 1].equals("B")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow][snakeCol - 1] = ".";
                            for (int rows = 0; rows < matrix.length; rows++) {
                                for (int cols = 0; cols < matrix[rows].length; cols++) {
                                    if (matrix[rows][cols].equals("B")) {
                                        matrix[rows][cols] = "S";
                                        snakeRow = rows;
                                        snakeCol = cols;
                                    }
                                }
                            }
                        } else {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow][snakeCol - 1] = "S";
                            snakeCol -= 1;
                        }
                    } else {
                        System.out.println("Game over!");
                        System.out.println(String.format("Food eaten: %d", food));
                        matrix[snakeRow][snakeCol] = ".";
                        for (int rows = 0; rows < matrix.length; rows++) {
                            for (int cols = 0; cols < matrix[rows].length; cols++) {
                                System.out.print(matrix[rows][cols]);
                            }
                            System.out.println();
                        }
                    }
                    break;
                case "right":
                    if (snakeCol < matrix.length - 1) {
                        //check if food
                        if (matrix[snakeRow][snakeCol + 1].equals("*")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow][snakeCol + 1] = "S";
                            snakeCol += 1;
                            food += 1;
                            break;
                        }
                        if (matrix[snakeRow][snakeCol + 1].equals("B")) {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow][snakeCol + 1] = ".";
                            for (int rows = 0; rows < matrix.length; rows++) {
                                for (int cols = 0; cols < matrix[rows].length; cols++) {
                                    if (matrix[rows][cols].equals("B")) {
                                        matrix[rows][cols] = "S";
                                        snakeRow = rows;
                                        snakeCol = cols;
                                    }
                                }
                            }
                        } else {
                            matrix[snakeRow][snakeCol] = ".";
                            matrix[snakeRow += 1][snakeCol] = "S";
                            snakeCol += 1;
                        }
                    } else {
                        System.out.println("Game over!");
                        System.out.println(String.format("Food eaten: %d", food));
                        matrix[snakeRow][snakeCol] = ".";
                        for (int rows = 0; rows < matrix.length; rows++) {
                            for (int cols = 0; cols < matrix[rows].length; cols++) {
                                System.out.print(matrix[rows][cols]);
                            }
                            System.out.println();
                        }
                    }
                    break;
            }
            if (food >= 10){
                System.out.println("You won! You fed the snake.");
                System.out.println(String.format("Food eaten: %d",food));
                for (int rows = 0; rows < matrix.length; rows++) {
                    for (int cols = 0; cols < matrix[rows].length; cols++) {
                        System.out.print(matrix[rows][cols]);
                    }
                    System.out.println();
                }
                break;
            }
            command = sc.nextLine();
        }

    }

}