import java.util.*;
import java.io.*;

public class ZipUnzip {

    public static void main(String[] args) {
        userInterface();
    }

    public static void userInterface() {
        Scanner console = new Scanner(System.in);
        System.out.print("Would you like to compress or decompress a file? : ");
        String pressAnswer = console.next();
        boolean Answer = false;
        if (pressAnswer.equals("compress")) {
            Answer = true;
        }
        else if (pressAnswer.equals("decompress")) {
            Answer = false;
        }
        else {
            System.out.println("Invalid command");
            System.exit(1);
        }

        System.out.print("What will be the name of the input file?: ");
        Scanner in = getInputScanner(console);

        System.out.print("What will be the name of the output file?: ");
        PrintStream out = getOutputPrintStream(console);

        processFile( Answer, in , out);

    }

    public static Scanner getInputScanner(Scanner console){
        Scanner in = null; //null signifies NO object reference
        while (in == null) {
            System.out.print("input file name? ");
            String name = console.next();
            try {
                in = new Scanner(new File(name));
            }
            catch (FileNotFoundException e) {
                System.out.println("File not found. "
                + "Please try again.");
            }
        }
        return in;
    }

    public static PrintStream getOutputPrintStream(Scanner console){
        String outfilename = console.next();
        File f = new File(outfilename);

        if (f.exists()) {
            System.out.println("The file exists.... exiting");
            System.exit(1);
        }

        PrintStream out = null;

        try {
            out = new PrintStream(f);
        }
        catch (FileNotFoundException e) {
            System.out.println(e.getMessage());
            System.exit(1);
        }
        return out;
    }

    public static void processFile (boolean compress, Scanner input, PrintStream output){
        if(compress == true) {
            while (input.hasNextLine()) {
                String line = input.nextLine();
                output.println(compressLine(line));
            }
        }
        else {
            while (input.hasNextLine()) {
                String line = input.nextLine();
                output.println(decompressLine(line));

            }
        }
    }

    public static String compressLine(String line){
        Scanner scan = new Scanner(line);
        String compressedLine = "";
        String compressedWord = "";
        while(scan.hasNext()) {
            String word = scan.next();
            compressedWord = compress(word);
            compressedLine = compressedLine + " " + compressedWord;
        }
        return compressedLine;
    }

    public static String compress(String word) {
        String compressedWord = word;
        if (word.length() < 2) {
            word = compressedWord;
        }
        else if (word.length() == 2) {
            if (word == "an") {
                compressedWord = "%";
            }
            else if (word == "re") {
                compressedWord = "@";
            }
            else {
                compressedWord = word;
            }
        }
        else if (word.length() > 2) {
            for (int i = 2; i < compressedWord.length(); i++) {
                String search = compressedWord.substring(i-2, i+1);

                if (search.equals("the")) {
                    System.out.println("FLAG the");
                    compressedWord = compressedWord.substring(0, i-2) + "~" + compressedWord.substring(i+1, compressedWord.length());
                    break;
                }
                else {
                    continue;
                }
            }
            for (int i = 2; i < compressedWord.length(); i++) {
                String search = compressedWord.substring(i-2, i+1);
                if (search.equals("ion")) {
                    compressedWord = compressedWord.substring(0, i-2) + "&" + compressedWord.substring(i+1, compressedWord.length());
                    break;
                }
                else {
                    continue;
                }
            }
            for (int i = 2; i < word.length(); i++) {
                String search = word.substring(i-2, i+1);
                if (search.equals("ing")) {
                    compressedWord = compressedWord.substring(0, i-2) + "#" + compressedWord.substring(i+1, compressedWord.length());
                    break;
                }
                else {
                    continue;
                }
            }
            for (int i = 1; i < compressedWord.length(); i++) {
                String search = compressedWord.substring(i-1, i+1);
                if (search.equals("an")) {
                    compressedWord = compressedWord.substring(0, i-1) + "%" + compressedWord.substring(i+1, compressedWord.length());
                    break;
                }
                else {
                    continue;
                }
            }
            for (int i = 1; i < compressedWord.length(); i++) {
                String search = compressedWord.substring(i-1, i+1);
                if (search.equals("re")) {
                    compressedWord = compressedWord.substring(0, i-1) + "@" + compressedWord.substring(i+1, compressedWord.length());
                    break;
                }
                else {
                    continue;
                }
            }
            for (int i = 2; i < compressedWord.length(); i++) {
                String search = compressedWord.substring(i-2, i+1);
                if (search.equals("con")) {
                    compressedWord = compressedWord.substring(0, i-2) + "$" + compressedWord.substring(i+1, word.length());
                    break;
                }
                else {
                    continue;
                }
            }
        }

        return compressedWord;
    }

    public static String decompressLine(String line){
        Scanner scan = new Scanner(line);
        String decompressedLine = "";
        String decompressedWord = "";
        while(scan.hasNext()) {
            String word = scan.next();
            decompressedWord = decompress(word);
            decompressedLine = decompressedLine + " " + decompressedWord;
        }
        return decompressedLine;
    }

    public static String decompress(String word) {
        String decompressedWord = word;
        System.out.println(decompressedWord);

        if (decompressedWord.length() == 1) {
            if (decompressedWord.equals("~")) {
                decompressedWord = "the";
            }
            else if (decompressedWord.equals("&")) {
                decompressedWord = "ion";
            }
            else if (decompressedWord.equals("#")) {
                decompressedWord = "ing";
            }
            else if (decompressedWord.equals("%")) {
                decompressedWord = "an";
            }
            else if (decompressedWord.equals("@")) {
                decompressedWord = "re";
            }
            else if (decompressedWord.equals("$")) {
                decompressedWord = "con";
            }
        }
        else if (decompressedWord.length() > 1) {
            for (int i = 0; i < decompressedWord.length() ; i++) {
                char search = decompressedWord.charAt(i);
                if (search == '~') {
                    decompressedWord  = decompressedWord.substring(0, i) +"the" + decompressedWord.substring(i+1, decompressedWord.length());
                }
            }
            for (int i = 0; i < decompressedWord.length(); i++) {
                char search = decompressedWord.charAt(i);
                if (search == '&') {
                    decompressedWord  = decompressedWord.substring(0, i) +"ion" + decompressedWord.substring(i+1, decompressedWord.length());
                }
            }
            for (int i = 0; i < decompressedWord.length(); i++) {
                char search = decompressedWord.charAt(i);
                if (search == '#') {
                    decompressedWord  = decompressedWord.substring(0, i) +"ing" + decompressedWord.substring(i+1, decompressedWord.length());
                }
            }
            for (int i = 0; i < decompressedWord.length(); i++) {
                char search = decompressedWord.charAt(i);
                if (search == '%') {
                    decompressedWord  = decompressedWord.substring(0, i) +"an" + decompressedWord.substring(i+1, decompressedWord.length());
                }
            }
            for (int i = 0; i < decompressedWord.length(); i++) {
                char search = decompressedWord.charAt(i);
                if (search == '@') {
                    decompressedWord  = decompressedWord.substring(0, i) +"re" + decompressedWord.substring(i+1, decompressedWord.length());
                }
            }
            for (int i = 0; i < decompressedWord.length(); i++) {
                char search = decompressedWord.charAt(i);
                if (search == '$') {
                    decompressedWord  = decompressedWord.substring(0, i) +"con" + decompressedWord.substring(i+1, decompressedWord.length());
                }
            }
        }
        return decompressedWord;
    }
}