package lab_6;

public class Decoder {

    public static void main(String[] args)
    {
        String word = "����";
        String result = "����";

        try {
            Decoder.decode(word, result);

        } catch (Exception exc) {
            System.out.println(exc);
        }
    }

    public static void decode(String word, String result)
    {
        int sum;
        int count = 0;

        for (int firstIndex = 123; firstIndex < 987; firstIndex++) {

            for (int secondIndex = 123; secondIndex < 987; secondIndex ++)
            {
                if (isRepeated(Integer.toString(firstIndex), Integer.toString(secondIndex))) {
                    continue;
                }

                sum = firstIndex + secondIndex;

                if (sum > 9876) {
                    continue;
                }

                if (isRepeated(Integer.toString(firstIndex), Integer.toString(sum)))
                {
                    continue;
                }

                if (isRepeated(Integer.toString(secondIndex), Integer.toString(sum)))
                {
                    continue;
                }

                if (Integer.toString(firstIndex).split("")[0] == Integer.toString(sum).split("")[2]) {
                    continue;
                }

                count++;

                System.out.println(firstIndex + " + " + secondIndex + " = " + sum);
            }
        }

        System.out.println("�������: " + count);
    }

    private static boolean isRepeated(String firstString, String secondString)
    {
        String[] firstStringArray = firstString.split("");

        for (String firstLetter: firstStringArray)
        {
            if (!stringIsValid(firstString))
            {
                return true;
            }

            if (!stringIsValid(secondString))
            {
                return true;
            }

            if (secondString.indexOf(firstLetter) != -1)
            {
                return true;
            }
        }

        return false;
    }

    private static boolean stringIsValid(String string)
    {
        String[] letters = string.split("");
        String substring;
        int index = 0;

        while (index < letters.length - 1)
        {
            substring = string.substring(index);

            if (string.substring(index + 1).indexOf(letters[index]) != -1)
            {
                return false;
            }

            index++;
        }

        return true;
    }
}