package cz.muni.fi.bronchus.questions;

import java.util.Vector;

/**
 * Connecting Objects Question. There are two lists of answers and the third one
 * with the reference for the connection of two answers.
 * Example 1:
 * 
 *  3 AnswerA Answer1
 *  2 AnswerB Answer2
 *  1 AnswerC Answer3
 *   
 * Example 2:
 *  2 AnswerA Answer1
 *  2 AnswerB Answer2
 *  1 AnswerC
 *
 * @author Tomáš Udržal
 */
public class ConnectingObjectsQuestion extends Question {
    
    /**
     * Vector of answers's references - left column
     */
    private Vector column1;

    /**
     * Vector of answers - middle column
     */
    private Vector column2;
    
    /**
     * Vector of answers - right column
     */
    private Vector column3;
    
    /**
     * Shuffle order of answers
     */
    private boolean shuffle;
    
    /** Creates a new instance of ConnectingObjectsQuestion */
    public ConnectingObjectsQuestion() {
        super("Connecting Objects");
        column1=new Vector();
        column2=new Vector();
        column3=new Vector();
        shuffle=false;
    }
    
    /**
     * Adds an answer's reference - left column - to the end of the Vector
     * @param x1 answer's reference to be add
     */
    public void addAnswerColumn1(Integer x1) {
        column1.add(x1);
    }
    
    /**
     * Adds an answer - middle column - to the end of the Vector
     * @param x2 answer to be added
     */
    public void addAnswerColumn2(String x2) {
        column2.add(x2);
    }

    /**
     * Adds an answer - right column - to the end of the Vector
     * @param x3 answer to be added
     */
    public void addAnswerColumn3(String x3) {
        column3.add(x3);
    }
    
    /**
     * Getter method for the Vector of answers's referenced - left column
     * @return Vector of answers's references
     */
    public Vector getAnswerColumn1() { return column1; }
    
    /**
     * Getter method for the Vector of answers - middle column
     * @return Vector of answers
     */
    public Vector getAnswerColumn2() { return column2; }
    
    /**
     * Getter method for the Vector of answers - right column
     * @return Vector of answers
     */
    public Vector getAnswerColumn3() { return column3; }
    
    /**
     * Setter method for the shuffle of answers
     * @param x true if shuffle of answers is enabled otherwise false
     */
    public void setShuffle(boolean x) { shuffle=x; }
    
    /**
     * Getter method for the shuffle of answers
     * @return true if shuffle of answers is enabled otherwise false
     */
    public boolean isShuffle() { return shuffle; }

    /**
     * Method for generating a response processing condition from a selected answers
     * @return response processing condition
     */
    public String generateCondition() {
        String s="";
        if (column1.size()==0) { //varianta odpovedi zadavani bez poradi
            for (int i=0; i<column2.size(); i++) {
                s=s+answerLetters[i]+"==#"+String.valueOf(i+1)+" && ";
            }
        } else { //varianta odpovedi se zadavanim poradi
            for (int i=0; i<column2.size(); i++) {
                s=s+answerLetters[i]+"==#"+((Integer)column1.get(i)).toString()+" && ";
            }
        }
        if (s.compareTo("")!=0)
            s=s.substring(0,s.length()-4);  //odstran posledni " && "
        return s;
    } 

}