import java.util.Scanner;
import java.util.Random;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
/**
 * This class implements a technical support system. it is the top level class in this project. 
 * The support system communicatives via text input/output in the text terminal
 * This class uses an object of class InputReader to read input from the user,
 * and an object of class Responder to generate responses. It contains a loop 
 * that repeatedly reads input and generates output untill the users wants to leaves.
 * 
 * @author Ahmad Lamaul Farid
 * @version 12 November 2020
 */
public class SupportSystem
{
    private InputReader reader;
    private Responder responder;
    
    /**
     * Creates a technical support system.
     */
    public SupportSystem()
    {
        reader = new InputReader();
        responder = new Responder();
    }
    
    /**
     * Start the technical support system. This will print a welcome message
     * and enter into a dialog with the user, untill the user ends the dialog.
     */
    public void start()
    {
        boolean finished = false;
        printWelcome();
        
        while(!finished)
        {
            HashSet<String> input = reader.getInput();
            if(input.contains("bye"))
            {
                finished = true;
            }
            else
            {
                String response = responder.generateResponse(input);
                System.out.println(response);
            }
        }
        printGoodbye();
    }
    
    /**
     * Print a welcome message to the screen.
     */
    private void printWelcome()
    {
        System.out.println("**** Welcome to the Dibel Technical Support System. ****");
        System.out.println();
        System.out.println("Please tell us about your problem.");
        System.out.println("Please type 'bye' to exit our system.");
        System.out.println();
    }   
    
    /**
     * Print a good-bye message to the screen.
     */
    private void printGoodbye()
    {
        System.out.println("Nice talking to you. Bye......");
    }
    
}