import java.util.Scanner;

public class AuthoringAssistant {
   public static String shortenSpace(String singleSpace) {
    String doubleSpace = singleSpace.replaceAll("  ", " ");

    return doubleSpace;
   }


   public static String replaceExclamation(String exclaim) {
    String period = exclaim.replaceAll("!",".");

    return period;
   }


   public static int findText(String phrase, String sentence) {
    int phraseNum = 0;

    phraseNum = sentence.split(phrase).length - 1;

    return phraseNum;
   }


   public static int getNumOfWords(String wordCount) {
    int words = 0;
    //"a word is dead.
    for(int i = 0; i < wordCount.length(); i++) {
     if(wordCount.charAt(i) == ' ') {
      words = words + 1;
     }
    }
    words = words + 1;
    return words;
   }


   public static int getNumOfNonWSCharacters(String input) {
    int characterCount = 0;

    for(int i = 0; i < input.length(); i++) {
     if(input.charAt(i) != ' ') {
      characterCount = characterCount + 1;
     }
    }
    return characterCount;
   }


   public static String printMenu(){
    Scanner scnr = new Scanner(System.in);

    System.out.println("MENU");
    System.out.println("c - Number of non-whitespace characters");
    System.out.println("w - Number of words");
    System.out.println("f - Find text");
    System.out.println("r - Replace all !'s");
    System.out.println("s - Shorten spaces");
    System.out.println("q - Quit");
    System.out.println();
    System.out.println("Choose an option: ");

    String input = scnr.nextLine();
    while(!input.matches("c|w|f|r|s|q")) {
     input = scnr.nextLine();
     if(input.equals("q")) {
      break;
     }
    }

    return input;
   }

     public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);
        System.out.println("Enter a sample text: ");
        String sampleText = scnr.nextLine();
        System.out.println();
        System.out.println("You entered: " + sampleText);

        switch(printMenu()) {

        case "c":
        System.out.println("Number of non-whitespace characters: " + getNumOfNonWSCharacters(sampleText));
        break;
        case "w":
         System.out.println("Number of words: " + getNumOfWords(sampleText));
         break;
        case "f":
         System.out.println("Enter a word or phrase to be found: ");
         String phrase = scnr.nextLine();
         System.out.println("\"" + phrase + "\" instances: " + findText(phrase, sampleText));
         break;
        case "r":
         System.out.println("Edited text: " + replaceExclamation(sampleText));
         break;
        case "s":
         System.out.println(shortenSpace(sampleText));
         break;
        case "q":
         System.exit(0);
       }
   }
}