package exercise.choice;

import java.io.*;
import java.util.*;

public class ChoiceSolution {
    protected String		exerciseID;
    protected boolean[]		correctChoices;

    public ChoiceSolution(String exerciseID, boolean[] correctChoices) {
	this.exerciseID = exerciseID;
	this.correctChoices = correctChoices;
    }

    public String getExerciseID() { return exerciseID; }
    public boolean[] getCorrectChoices() { return correctChoices; }

    public static ChoiceSolution loadSolution(String exerciseID)
	throws IOException {

	// Load the contents of the Solution file.
	Class cl = ChoiceSolution.class;
	String resourceName = "solutions/" + exerciseID + ".txt";
	InputStream is = cl.getResourceAsStream(resourceName);
	InputStreamReader isr = new InputStreamReader(is);
	BufferedReader br = new BufferedReader(isr);
	String correctChoicesLine = br.readLine();
	br.close();

	// Return a Solution object.
	int numChoices = correctChoicesLine.length();
	boolean[] correctChoices = new boolean[numChoices];
	for (int i = 0; i < numChoices; i++) {
	    correctChoices[i] = (correctChoicesLine.charAt(i) == '1');
	}
	return new ChoiceSolution(exerciseID, correctChoices);
    }
}