package breaking_it_down;

import java.util.Scanner;

public class TooMuchInMain {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int operand1, operand2, answer;
        char operator='q';
        boolean keepCalculating = true;

        while (keepCalculating) {
            boolean operator_is_good=false;

            do
            {
                System.out.print("Enter an Operator: +  -  *  /  q for quit: ");
                String strOperator = scan.nextLine();
                strOperator = strOperator.trim();
                if (strOperator.length() == 0)
                    continue;
                operator = strOperator.charAt(0);
                operator_is_good=false;

                switch (operator)
                {
                    case 'q':
                    case '+':
                    case '-':
                    case '*':
                    case '/':
                        operator_is_good = true;

                        break;

                    default:
                        System.out.println("Your operator is bad ... try again:");

                        break;
                    }
                }

            while (!operator_is_good);

            if (operator == 'q') {
                keepCalculating=false;
                break;
                }

            int which =1;
            System.out.println("Enter operand "+which);
            String input;
            boolean operand_is_bad;
            do {
                operand_is_bad=false;
                input = scan.nextLine();
                input = input.trim();

                if (input.length() == 0)
                    operand_is_bad=true;

                for (int i=0; i < input.length(); i++) {
                    char c = input.charAt(i);

                    if (c < '0' || c > '9')
                    {
                        operand_is_bad=true;
                        System.out.println("Your last input was bad, try again");
                        }
                    }
                }

            while (operand_is_bad);

            operand1 =  Integer.parseInt(input);
            which =2;

            System.out.println("Enter operand "+which);

            do {
                operand_is_bad=false;
                input = scan.nextLine();
                input = input.trim();

                if (input.length() == 0)
                    operand_is_bad=true;
                for (int i=0; i < input.length(); i++) {
                    char c = input.charAt(i);
                    if (c < '0' || c > '9') {
                        operand_is_bad=true;
                        System.out.println("Your last input was bad, try again");
                        }
                    }
                }

            while (operand_is_bad);

            operand2 =  Integer.parseInt(input);

            switch(operator) {

            case '+':
                answer = operand1 + operand2;
                break;
            case '-':
                answer = operand1 - operand2;
                break;
            case '*':
                answer = operand1 * operand2;
                break;
            case '/':
                answer = operand1 / operand2;
                break;
            default:
                System.out.println("We shouldn't get here in doArithmentic!!!!");
                answer = -1;
                break;
                }

            System.out.println(operand1 + " "+ operator + " "+ operand2 + " = "+ answer);
            System.out.println("=======================");
            }
        System.out.println("Finished Calculations");
        }
    }