package node;

import java.nio.ByteBuffer;
import java.util.Random;

public class Identifier {
    private static Random random = new Random(System.currentTimeMillis());

    private int id;
    private boolean bits[] = new boolean[Node.ID_BITS];

    public Identifier(int id) {
        this.id = id;

        String bitstring = Integer.toBinaryString(id);
        for (int i = bitstring.length(); i > 0; i--) {
            bits[bits.length - i] = bitstring.charAt(bitstring.length() - i) == '1';
        }
    }

    public static Identifier getRandomIdentifier() {
        int max_value = (int) Math.pow(2, Node.ID_BITS);
        int id = (int) Math.abs((Math.round((max_value / 2)
                + random.nextGaussian() * (max_value / 2)) % max_value));
        return new Identifier(id);
    }

    public int getId() {
        return id;
    }

    public int distanceTo(Identifier otherID) {
        return id ^ otherID.getId();
    }

    public boolean isBitSetAt(int index) {
        return bits[index];
    }

    public byte[] getBytes() {
        ByteBuffer result = ByteBuffer.allocate(4);
        result.putInt(id);
        return result.array();
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Identifier)) {
            return false;
        } else {
            return id == ((Identifier) o).getId();
        }
    }

    public String toString() {
        return String.valueOf(id);
    }
}