import java.io.*;
import java.util.Scanner;

class Const{
    public static int  size;
}

public class lab2_4 {

    static Scanner scConsole = new Scanner(System.in);

    private static PrintWriter getOutputFileLocation() {
        boolean isIncorrect;
        String location;
        PrintWriter file = null;
        do {
            isIncorrect = false;
            System.out.println("Enter file location:");
            location = scConsole.nextLine();
            try {
                file = new PrintWriter(location);
            } catch (FileNotFoundException e) {
                isIncorrect = true;
                System.out.println("File with this location is not found");
            }
        } while (isIncorrect);
        if (file != null)
            System.out.println("File opened successfully");
        return file;
    }

    private static Scanner getInputFileLocation() {
        boolean isIncorrect;
        String location;
        Scanner file = null;
        do {
            isIncorrect = false;
            System.out.println("Enter file location:");
            location = scConsole.nextLine();
            try {
                file = new Scanner(new File(location));
            } catch (FileNotFoundException e) {
                isIncorrect = true;
                System.out.println("File with this location is not found");
            }
        } while (isIncorrect);
        if (file != null)
            System.out.println("File opened successfully");
        return file;
    }

    private static int[][] getArrayFromConsole(int[] size) {
        int i;
        int j;
        int[][] arrays = new int[size[0]][size[0]];
        boolean isIncorrect;
        System.out.println("Enter the matrix");
        for (i = 0; i < size[0]; i++) {
            for (j = 0; j < size[0]; j++)
                do {
                    isIncorrect = false;
                    try {
                        System.out.println("Enter the element number [" + (i + 1) + "|" + (j + 1) + "]");
                        arrays[i][j] = Integer.parseInt(scConsole.nextLine());
                    } catch (Exception e) {
                        System.out.println("Enter the number");
                        isIncorrect = true;
                    }
                } while (isIncorrect);
        }
        return arrays;
    }

    private static void deleteZeroStrings(int[][] arrays, int[] size) {
        int i = 0;
        int j;
        boolean zeroFounded;
        while (i < size[0]) {
            zeroFounded = false;
            j = 0;
            while ((j < arrays.length) & (!zeroFounded)) {
                if (arrays[i][j] == 0) {
                    zeroFounded = true;
                    for (int p = i; p < size[0] - 1; p++) {
                        arrays[p] = arrays[p + 1];
                    }
                    size[0]--;
                    i--;
                }
                j++;
            }
            i++;
        }
    }

    private static void print(int[][] arrays, int[] size) {
        for (int i = 0; i < size[0]; i++) {
            for (int j = 0; j < arrays.length; j++) {
                System.out.print(arrays[i][j] + " ");
            }
            System.out.println();
        }
    }

    private static void resultPrint(int[][] arrays, int[] size) {
        if (size[0] == 0) {
            System.out.println("All strings of this matrix were deleted");
        } else {
            for (int i = 0; i < size[0]; i++) {
                for (int j = 0; j < arrays.length; j++) {
                    System.out.print(arrays[i][j] + " ");
                }
                System.out.println();
            }
        }
    }

    private static int[] matrixSizeInput() {
        final int MIN_VALUE = 1;
        final int MAX_VALUE = 6;
        boolean isIncorrect;
        int[] size = new int[1];
        do {
            isIncorrect = false;
            try {
                size[0] = Integer.parseInt(scConsole.nextLine());
            } catch (Exception e) {
                System.out.println("Enter the number");
                isIncorrect = true;
            }
            if ((!isIncorrect) && ((size[0] < MIN_VALUE) || (size[0] > MAX_VALUE))) {
                System.out.println("Please enter a natural value less than six");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return size;
    }

    private static void getArrayFromFile(int[][] arrays, int[] size) {
        int i;
        int j;
        Scanner file = getInputFileLocation();
        for (i = 0; i < size[0]; i++) {
            for (j = 0; j < size[0]; j++)
                arrays[i][j] = file.nextInt();
        }
    }

    private static int chooseInput() {
        boolean isIncorrect;
        String line;
        do {
            isIncorrect = false;
            System.out.println("Do you want to input from file? (y/n)");
            line = scConsole.nextLine().toLowerCase();
            if (!line.equals("y") && !line.equals("n") && !line.equals("")) {
                isIncorrect = true;
                System.out.println("Enter valid answer");
            }
        } while (isIncorrect);
        if (line.equals("y") || line.equals("")) {
            return 0;
        } else {
            return 1;
        }
    }

    private static void outputToFile(int[][] arrays, int[] size) {
        PrintWriter out = getOutputFileLocation();
        for (int i = 0; i < size[0]; i++) {
            for (int j = 0; j < arrays.length; j++) {
                out.print(arrays[i][j]);
            }
            out.println();
        }
        out.close();
    }

    public static void main(String[] args) {
        System.out.println("Данная программа удаляет строки массива , содержащие нулевые элементы.");
        int chosenInput = chooseInput();
        System.out.println("Enter the matrix order");
        Const.size = matrixSizeInput();
        int[][] matrixArray = new int[size[0]][size[0]];
        if (chosenInput == 0) {
            getArrayFromFile(matrixArray, size);
        } else {
            matrixArray = getArrayFromConsole(size);
        }
        System.out.println("Original matrix");
        print(matrixArray, size);
        deleteZeroStrings(matrixArray, size);
        System.out.println("Modified matrix");
        resultPrint(matrixArray, size);
        outputToFile(matrixArray, size);
    }
}