/**
 *
 * @author Jacob
 *
 */
import java.util.*;
public class Assignment2 {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		String choice = null;
		String mainSentence = null;
		String word = null;
		String word2 = null;
		String tempSentence;
		char letter;
		int index;
		int counter = 0;
		boolean quit = false;

		System.out.println("Please enter a main sentence: ");
		mainSentence = input.nextLine();

		while(quit == false) {

		System.out.println("Please choose from one of the options below:\n A. Enter a new main sentence\n B. Find a string\n C. Find all incidents of a string\n D. Find and Replace the String\n"
		+ " E. Replace all incidents of a string to another one\n F. Count the number of words\n G. Count the number of occurences of a letter\n H. Count the total number of letters\n"
		+ " I. Delete all the occurences of a word\n J. Exit\n\n Enter your choice: " );
			choice = input.nextLine();

			switch (choice) {

			case "A":

				System.out.println("Enter a new main sentence: ");
				mainSentence = input.nextLine();

				System.out.println("The new main sentence is: " + mainSentence + "\n");

			break;

			case "B":

				System.out.println("Enter a word you would like to find: ");
				word = input.nextLine();

				System.out.println("The first occurance of " + word + " is at " + mainSentence.indexOf(word));

			break;

			case "C":

				System.out.println("Enter a word you would like to search for: ");
				word = input.nextLine();

				counter = mainSentence.indexOf(word);
				while (counter >= 0) {
				    System.out.println(counter);
				    counter = word.indexOf(word, counter + 1);
				}

				System.out.println(word + " occurs " + counter + " times.\n");

			break;

			case "D":

				System.out.println("Enter the string you would like to search for: ");
				word = input.nextLine();
				System.out.println("Enter the string you would like to replace it with: ");
				word2 = input.nextLine();

				if(mainSentence.contains(word) == true) {

					mainSentence = mainSentence.replaceFirst(word, word2);

					System.out.println("The new main sentence is: " + mainSentence);

				}

				else {

					System.out.println("Search string not found!\n");

				}

			break;

			case "E":

				System.out.println("Enter the word you would like to replace: ");
				word = input.nextLine();
				System.out.println("Enter what you would like to replace it with: ");
				word2 = input.nextLine();
				mainSentence = mainSentence.replaceAll(word, word2);
				System.out.println("The new sentence is " + mainSentence);

			break;

			case "F":

				counter = mainSentence.length() - mainSentence.replace(" ", "").length() + 1;
				System.out.println("The number of words is: " + counter);


			break;

			case "G":

				System.out.println("Enter a letter to count the number of occurrences: ");
				letter = input.next().charAt(0);

				for(int i = 0; i < mainSentence.length(); i++) {

					if(mainSentence.charAt(i) == letter)

						counter++;

				}

				System.out.println(letter + " occurs " + counter + " times");

			break;

			case "H":

				tempSentence = mainSentence.replaceAll(" ", "");
				System.out.println("Your sentence has " + tempSentence.length() + " letters.");


			break;

			case "I":

				System.out.println("Please enter a word you would like to delete: ");
				word = input.nextLine();
				mainSentence = mainSentence.replaceAll(word, "");
				System.out.println("The new main sentence is:\n " + mainSentence);

			break;

			case "J":

				quit = true;
				System.out.println("Goodbye!");

			break;

			}
		}
	}
}