import java.util.ArrayList;
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;

/**
 * Handles basic caesar encyrpyion
 *
 * @author Mark Davis
 * @version 2/10/2014
 */
public class Encryption
{
    private static int shift;
    private static String message, newMessage;
    static String newAlpha;
    static int[] plainfrequencies = new int[26];
    static int[] cipherfrequencies = new int[26];
    static String encrypted, translated;
    static final String alphabet = "abcdefghijklmnopqrstuvwxyz";
    public Encryption()
    {
    }

    public static void readIn() throws IOException
    {
        plainfrequencies = getFrequency("plaintext");
    }

    public static void encryptedIn() throws IOException
    {
        cipherfrequencies = getFrequency("ciphertext");
    }

    public static void translate() throws IOException
    {
        encrypted = readFromFile("secretmessage");
        String plainalpha = generateStrings(plainfrequencies);
        String cipheralpha = generateStrings(cipherfrequencies);
        for (char c: encrypted.toCharArray())
        {
                cipheralpha.indexOf(c) //START HERE
        }
    }
    public static String generateStrings(int[] array)
    {
        char[] chararray = new char[26];
        for (int i = 0; (i <= 25); i++)
        {
            int index = maxIndexOfArray(array);
            chararray[i] = alphabet.charAt(index);
            array[index] = 0;
        }
        return new String(chararray);
    }
    public static String getTranslated()
    {
        return translated;
    }

    public static String readFromFile(String filename) throws IOException
    {
        File fileName = new File(filename + ".txt");
        Scanner inFile = new Scanner(fileName);
        Scanner in = new Scanner(System.in);
        String text = "";
        while(inFile.hasNextLine())
        {
            text += inFile.nextLine();
        }
        text = text.replace(" ", "");
        return text;
    }

    public static int[] getFrequency(String filename) throws IOException
    {
        String text = readFromFile(filename);
        int[] frequencies = new int[26];
        for(int i = 0; (i < text.length()); i++)
        {
            char temp = text.charAt(i);
            if (canBeFoundIn(uncapitalize(temp), alphabet))
                frequencies[alphabet.indexOf(uncapitalize(temp))]++;
        }
        return frequencies;
    }

    public static boolean canBeFoundIn(char c, String s)
    {
        boolean test = false;
        char[] lowercases = s.toLowerCase().toCharArray();
        for (char e: lowercases)
        {
            if (c == e)
                test = true;
        }
        return test;
    }

    public static char uncapitalize(char d)
    {
        String dummy = "a" + d;
        dummy = dummy.toLowerCase();
        return dummy.charAt(1);
    }

    public static int maxIndexOfArray(int[] a)
    {
        int e = Integer.MIN_VALUE;
        int index = 0;
        for (int i = 0; (i > a.length); i++)
        {
            if (a[i] > e)
            {
                index = i;
                e = a[i];
            }
        }
        return index;
    }
}