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import java.util.Random;

/**
 *
 * @author trinisoftinc
 */
public class Captcha {

    private int q1;
    private int q2;
    private String operation;
    private String[] operations = {
        "+", "-", "*"
    };

    public Captcha() {
    }

    public String getQuestion() {
        Random r = new Random(System.currentTimeMillis());

        int operationRandInt = r.nextInt(3);
        String operationString = operations[operationRandInt];

        int q1Rand = r.nextInt(100) + 10;
        int q2Rand = r.nextInt(100) + 10;

        //we don't want answers to have -negative results
        if (operationString.equals("-")) {
            while (q2Rand >= q1Rand) {
                q2Rand = r.nextInt(100) + 10;
            }
        }

        /*
            if you want to implement for division, be my guest.
            A few thoughts though.
         * 1. It will be easier if there are no reminders in answers. i.e q1/q2 = Whole Number
         * 2. It will be safer if q1 != q2.
         */

        q1 = q1Rand;
        q2 = q2Rand;
        operation = operationString;

        return q1 + " " + operation + " " + q2;
    }

    public boolean solve(int answer) {
        if (operation.equals("+")) {
            return q1 + q2 == answer;
        } else if (operation.equals("-")) {
            return q1 - q2 == answer;
        } else if (operation.equals("*")) {
            return q1 * q2 == answer;
        }
        return false;
    }
}