public class SpellcheckerCipher {

    static Scanner input = new Scanner(System.in);
    static String[] inputWordsArr;

    public static void main(String[] args) {
        System.out.printf("Enter Text: ");
        String text = input.nextLine();

        text = text.replace(".", "");
        inputWordsArr = text.split(" ");

        System.out.println(getShiftedLetters());
    }
    private static String getShiftedLetters() {
        ArrayList<String> fileWordsArr = new ArrayList<String>();
        try (BufferedReader br = new BufferedReader(new FileReader("C:/Users/Oskar/workspace/SpellcheckerCipher/latindictionary.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                fileWordsArr.add(line);
            }
        }
        catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }

        String result = "";

        for(int i = 0; i < inputWordsArr.length; i++) {
            for(int j = 0; j < inputWordsArr[i].length(); j++) {
                for(int k = 0; k < fileWordsArr.size(); k++) {
                    if(!inputWordsArr[i].equals(fileWordsArr.get(k))) {
                        if(shiftWord(inputWordsArr[i], j).equals(fileWordsArr.get(k))) {
                            System.out.println(inputWordsArr[i] + " -> " + fileWordsArr.get(k) + " | " + inputWordsArr[i].charAt(j) + " -> " + shiftLetterBack(inputWordsArr[i].charAt(j)));
                            result += shiftLetterBack(inputWordsArr[i].charAt(j));
                            k = fileWordsArr.size();
                        }
                    }
                }
            }
        }
        return result;
    }
    private static String shiftWord(String word, int index) {
        char c = shiftLetterBack(word.charAt(index));
        String[] wordArr = word.split("");
        wordArr[index] = String.valueOf(c);
        return String.join("", wordArr);
    }
    private static char shiftLetterBack(char c) {
        if(Character.isLowerCase(c)) {
            return (char) (((c - 'a' - 1) % 26) + 'a');
        }
        return (char) (((c - 'A' - 1) % 26) + 'A');
    }
}