package de.blinkt.openvpn;

import java.util.LinkedList;
import java.util.Vector;

import android.util.Log;

public class OpenVPN {
	private static OpenVpnService mOpenVpnService;
	private static final int MAXLOGENTRIES = 500;
	public static native int startOpenVPNThread();
	public static native int startOpenVPNThreadArgs(String argv[]);
	private static final String TAG = "OpenVpn";


	public static LinkedList<String> logbuffer = new LinkedList<String>();
	private static int counter=0;

	private static Vector<LogListener> logListener=new Vector<OpenVPN.LogListener>();
	private static String[] mBconfig;

	public interface LogListener {
		void newLog(String logmessage);
	}

	static {
		System.loadLibrary("crypto");
		System.loadLibrary("ssl");
		System.loadLibrary("lzo");
		System.loadLibrary("openvpn");
	}

	static void addRoute(String dest,String mask, String gw) {
		Log.i("openvpn" ,"Got Routing information " + dest + " " + mask + "  " + gw  );	
		mOpenVpnService.addRoute(dest,mask);
	}

	synchronized static void logMessage(int level,String prefix, String message)
	{
		logbuffer.addLast(prefix + " " + message);
		if(logbuffer.size()>MAXLOGENTRIES)
			logbuffer.removeFirst();

		// The garbage collector does not collect the String from native
		// but kills me for logging 100 messages with too many references :(
		// Force GC how and then to kill loose ends
		if(counter++ % 50==0) {
			System.gc();
		}

		for (LogListener ll : logListener) {
			ll.newLog(prefix + "  "  + message);
		}

	}

	synchronized static void clearLog() {
		logbuffer.clear();
	}

	synchronized static void addLogListener(LogListener ll){
		logListener.add(ll);
	}

	synchronized static void removeLogListener(LogListener ll) {
		logListener.remove(ll);
	}


	static void addInterfaceInfo(int mtu, String local, String netmask)
	{
		Log.i("openvpn","Got interface info M"  + mtu + " L: " + local + "NM: " + netmask);
		mOpenVpnService.setLocalIP(local,netmask);
	}

	static void addDns(String dns) {
		Log.i("openvpn","Got DNS Server: " + dns);
		mOpenVpnService.addDNS(dns);
	}


	static void addDomain(String domain) {
		Log.i("openvpn","Got DNS Domain: " + domain);
		mOpenVpnService.setDomain(domain);
	}


	public static void setCallback(OpenVpnService openVpnService) {
		mOpenVpnService = openVpnService;
	}

	public static boolean protectSocket (int sockfd)
	{
		boolean p = mOpenVpnService.protect(sockfd);
		if(p)
			Log.d("openvpn","Protected socket "+ sockfd);
		else
			Log.e("openvpn","Error protecting socket "+ sockfd);
		return p;
	}

	public static int openTunDevice() {
		Log.d(TAG,"Opening tun device");
		return mOpenVpnService.openTun();
	}
	//! Dummy method being called to force loading of JNI Libraries
	public static void foo() {	}

	synchronized public static String[] getlogbuffer() {

		// The stoned way of java to return an array from a vector
		// brought to you by eclipse auto complete
		return (String[]) logbuffer.toArray(new String[logbuffer.size()]);

	}
	public static void logBuilderConfig(String[] bconfig) {
		mBconfig =bconfig;
	}
	public static void triggerLogBuilderConfig() {
		if(mBconfig==null) {
			logMessage(0, "", "No active interface");
		} else {
			for (String item : mBconfig) {
				logMessage(0, "", item);
			}	
		}

	}
}