/*
 * Eliezer Encarnacion
 * Due Date: 11/14/2018
 * Course Number: CSC-220-D01
 * Course Name: Data Structures/Algorithms
 * Problem Number: HW #7
 * Email: [email protected]
 * Recursion Homework. Input a String and returns a report on the frequency of characters in the String.
 */

import java.util.ArrayList;
import java.util.Scanner;

public class HW7Recursion {

	private static void setReport(ArrayList<Report> report, String phrase, int times) {
		int i = times;

		if (i == -1)
			return;

		Report newReport = new Report(phrase.charAt(i), 1);
		int index = report.indexOf(newReport);

		if (index == -1) {
			report.add(newReport);
			setReport(report, phrase, (i - 1));
		}
		else {
			report.get(report.indexOf(newReport)).addToCount();
			setReport(report, phrase, (i - 1));
		}
	}

	// **********************************************

	private static String output(ArrayList<Report> report, int times, String outP) {
		int i = times;

		if (i == 0)
			return outP;
		else {
			outP = outP + report.get(i-1).toString() + "\n";
			return output(report, (i - 1), outP);
		}
	}

	// **********************************************

	private static String getPhrase(Scanner sc) {
		System.out.println("Enter a String: ");
		String phrase = sc.nextLine();
		return phrase;
	}

	// **********************************************

	private static void process(Scanner sc, String args[]) {

		try {
			System.out.println();
			String phrase = getPhrase(sc);
			int times = phrase.length();
			ArrayList<Report> report = new ArrayList<>();
			setReport(report, phrase, (times - 1));
			System.out.print(output(report, report.size(), ""));

			/*for (int i=0; i < report.size(); i++) {
				System.out.println(report.get(i).toString());
			}*/

		} catch (Exception ex) {
			ex.printStackTrace();
		}

	}

	// **********************************************

	private static boolean doThisAgain(Scanner sc, String prompt) {
		System.out.print(prompt);
		String doOver = sc.nextLine();
		return doOver.equalsIgnoreCase("Y");
	}

	// **********************************************

	public static void main(String args[]) {
		final String TITLE = "String and Report Recursion Application V1.0";
		final String CONTINUE_PROMPT = "Do this again? [y/N] ";

		System.out.println("Welcome to " + TITLE);
		Scanner sc = new Scanner(System.in);

		do {
			process(sc, args);
		} while (doThisAgain(sc, CONTINUE_PROMPT));
		sc.close();
		System.out.println("Thank you for using " + TITLE);
	}

}