package edu.princeton.bitcointwofactorauth.android;
/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import android.content.Context;
import android.net.nsd.NsdServiceInfo;
import android.net.nsd.NsdManager;
import android.util.Log;

public class NsdHelper {

	MainActivity mContext;

    NsdManager mNsdManager;
    NsdManager.ResolveListener mResolveListener;
    NsdManager.DiscoveryListener mDiscoveryListener;
    NsdManager.RegistrationListener mRegistrationListener;

    public static final String SERVICE_TYPE = "_bitcointwofactor._tcp.";

    public static final String TAG = "NsdHelper";
    public String mServiceName = "BitcoinTwoFactor";
    
    NsdServiceInfo mService;

    public NsdHelper(MainActivity context) {
        mContext = context;
        mNsdManager = (NsdManager) context.getSystemService(Context.NSD_SERVICE);
    }

    public void initializeNsd() {
        initializeDiscoveryListener();

    }

    public void initializeDiscoveryListener() {
        mDiscoveryListener = new NsdManager.DiscoveryListener() {

            public void onDiscoveryStarted(String regType) {
                Log.d(TAG, "Service discovery started");
            }

            public void onServiceFound(NsdServiceInfo service) {
                Log.d(TAG, "Service discovery success" + service);
                if (!service.getServiceType().equals(SERVICE_TYPE)) {
                    Log.d(TAG, "Unknown Service Type: " + service.getServiceType());
                } else if (service.getServiceName().equals(mServiceName)) {
                    Log.d(TAG, "Same machine: " + mServiceName);
                } else {
                	Log.d(TAG, "Trying to resolve " + service);
                    mNsdManager.resolveService(service, mContext);
                }
            }

            public void onServiceLost(NsdServiceInfo service) {
                Log.e(TAG, "service lost" + service);
                if (mService == service) {
                    mService = null;
                }
            }
            
            public void onDiscoveryStopped(String serviceType) {
                Log.i(TAG, "Discovery stopped: " + serviceType);        
            }

            public void onStartDiscoveryFailed(String serviceType, int errorCode) {
                Log.e(TAG, "Discovery failed: Error code:" + errorCode);
                mNsdManager.stopServiceDiscovery(this);
            }

            public void onStopDiscoveryFailed(String serviceType, int errorCode) {
                Log.e(TAG, "Discovery failed: Error code:" + errorCode);
                mNsdManager.stopServiceDiscovery(this);
            }
        };
    }

    public void discoverServices() {
        mNsdManager.discoverServices(
                SERVICE_TYPE, NsdManager.PROTOCOL_DNS_SD, mDiscoveryListener);
    }
    
    public void stopDiscovery() {
        mNsdManager.stopServiceDiscovery(mDiscoveryListener);
    }

    public NsdServiceInfo getChosenServiceInfo() {
        return mService;
    }
    
    public void tearDown() {
    	stopDiscovery();
    }
}