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

public class Main {

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

    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;
    }

    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;
    }

    static String getLineFromFile() {
        String str = null;
        Scanner file = getInputFileLocation();
        boolean isIncorrect = false;
        do {
            try {
                str = file.nextLine();
            } catch (Exception e) {
                isIncorrect = true;
                System.out.println("Enter natural number");
            }
            if ((!isIncorrect) && (str.length() == 0)) {
                System.out.println("The line is empty");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return str;
    }

    static int findBalance(String str){
        int flag = 0;
        int i = 1;
        while ((flag > -1) & (i < str.length())){
            if (str.charAt(i) == '('){
                flag++;
            }
            if (str.charAt(i) == ')'){
                flag--;
            }
            i++;
        }
        return flag;
    }

    static void printToConsole(int flag){
        if (flag == 0){
            System.out.println("В данном предложении баланс скобок соблюдён.");
        } else {
            System.out.println("Баланс скобок в данном предложении нарушен");
        }
    }

    static String getLineFromConsole () {
        String str = null;
        boolean isIncorrect;
        do {
            isIncorrect = false;
            try {
                str = scConsole.nextLine();
            } catch (Exception e) {
                System.out.println("Enter the number");
                isIncorrect = true;
            }
            if (str.length() == 0) {
                System.out.println("You entered an empty line!\nRepeat enter");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return str;
    }


    static void outputToFile(int flag) {
        PrintWriter out = getOutputFileLocation();
        if (flag == 0){
            out.println("В данном предложении баланс скобок соблюдён.");
        } else {
            out.println("Баланс скобок в данном предложении нарушен");
        }
        out.close();
    }

    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;
        }
    }

    public static void main (String[]args){
        String str;
        System.out.println("Проверить, имеется ли в заданном тексте баланс открывающих и закрывающих скобок.");
        int chosenInput = chooseInput();
        System.out.println("Введите строку");
        if (chosenInput == 0) {
            str = getLineFromFile();
        } else {
            str = getLineFromConsole();
        }
        int flag = findBalance(str);
        System.out.println("Результат:");
        printToConsole(flag);
        outputToFile(flag);
    }
}