package aQute.bnd.settings;

import java.security.*;
import java.security.interfaces.*;
import java.util.*;
import java.util.prefs.*;

import aQute.libg.cryptography.*;
import aQute.libg.tuple.*;

public class Settings {
	public final static String	EMAIL			= "email";
	public final static String	NAME			= "name";
	public final static String	PASSWORD_SHA1	= "password.sha1";
	final static String			KEY_PRIVATE		= "key.private";
	final static String			KEY_PUBLIC		= "key.public";
	final static String			KEY_SET			= "key.set";

	static Preferences			prefs			= Preferences.userNodeForPackage(Settings.class);

	public String globalGet(String key, String def) {
		return prefs.get(key, def);
	}

	public void globalSet(String key, String value) throws BackingStoreException {
		prefs.put(key, value);
		prefs.sync();
	}

	public Collection<String> getKeys() throws BackingStoreException {
		return Arrays.asList(prefs.keys());
	}

	public void globalRemove(String key) throws BackingStoreException {
		prefs.remove(key);
		prefs.sync();
	}

	private void generate() throws NoSuchAlgorithmException {
		Pair<? extends PrivateKey, ? extends RSAPublicKey> pair = RSA.generate();
		prefs.put(KEY_PRIVATE, Crypto.toString(pair.a));
		prefs.put(KEY_PUBLIC, Crypto.toString(pair.b));
		prefs.putBoolean(KEY_SET, true);
	}

	public PrivateKey getPrivateKey() throws Exception {
		if (prefs.getBoolean(KEY_SET, false))
			generate();

		String key = prefs.get(KEY_PRIVATE, null);
		return Crypto.fromString(key, PrivateKey.class);
	}

	public PublicKey getPublicKey() throws Exception {
		if (prefs.getBoolean(KEY_SET, false))
			generate();

		String key = prefs.get(KEY_PUBLIC, null);
		return Crypto.fromString(key, PublicKey.class);
	}

}