import java.util.*;
/**
 * The responder class represents a response-generator object.
 * It is used to generate an automatic response to an input string.
 *
 * @author      Muhammad Bagus Istighfar
 * @version     0.1 - 11 November 2020
 */
public class Responder
{
        private Random randomGenerator;
        private ArrayList<String> defaultResponses;
        private HashMap<String, String> responseMap;
        /**
         * Create a responder.
         */
        public Responder()
        {
            defaultResponses = new ArrayList<String>();
            responseMap = new HashMap<String, String>();
            fillResponses();
            fillDefaultResponses();
            randomGenerator = new Random();
        }
        /**
         * Generate a response.
         * @return      A string that should be displayed as the response.
         */
        public String generateResponse(HashSet<String> words)
        {
            for(String word : words)
            {
                String response = responseMap.get(word);
                if(response != null)
                {
                    return response;
                }
            }
            return pickDefaultResponse();
        }
        /**
         * Build up a list of default responses from which we can pick one
         * if we don't know what else to say.
         */
        private void fillResponses()
        {
            responseMap.put("halo", "Haloo!!!" + "Bagaimana kabarmu?");
            responseMap.put("buruk", "Apakah kamu sakit? :(");
            responseMap.put("sedih", "Semoga harimu lekas membaik ya!" + "Jadikan harimu sebagai pembelajaran");
            responseMap.put("baik", "Wawww, aku juga ikut senang.");
            responseMap.put("tidak", "oh, okee.");
            responseMap.put("kamu", "Aku ChatSkuy, yang akan menemani hari - harimu");
            responseMap.put("kasih", "Sudah menjadi tugasku");
        }
        
        private void fillDefaultResponses()
        {
            defaultResponses.add("Maaf saya tidak mengerti ");
            defaultResponses.add("Coba lagi");
        }
        
        private String pickDefaultResponse()
        {
            int index = randomGenerator.nextInt(defaultResponses.size());
            return defaultResponses.get(index);
        }
    
}