package de.tudarmstadt.informatik.hostage.sync.tracing;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyStore;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.IntentService;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.os.ResultReceiver;
import android.preference.PreferenceManager;
import android.util.Log;
import de.tudarmstadt.informatik.hostage.logging.NetworkRecord;
import de.tudarmstadt.informatik.hostage.logging.Record;
import de.tudarmstadt.informatik.hostage.logging.SyncInfoRecord;
import de.tudarmstadt.informatik.hostage.net.MySSLSocketFactory;
import de.tudarmstadt.informatik.hostage.persistence.HostageDBOpenHelper;
import de.tudarmstadt.informatik.hostage.sync.android.SyncUtils;
import de.tudarmstadt.informatik.hostage.ui.model.LogFilter;

/**
 * Service that synchronizes with a specified remote server.
 * 
 * @author Lars Pandikow
 */
public class TracingSyncService extends IntentService {

	public static final String REMOTE_DEVICE = "de.tudarmstadt.informatik.hostage.REMOTE_DEVICE";

	public static final String ACTION_START_SYNC = "de.tudarmstadt.informatik.hostage.ACTION_START_SYNC";
	public static final String EXTRA_RECEIVER = "de.tudarmstadt.informatik.hostage.EXTRA_HANDLER";

	public static final String UPLOAD_SIZE = "de.tudarmstadt.informatik.hostage.UPLOAD_SIZE";
	public static final String UPLOAD_PROGRESS = "de.tudarmstadt.informatik.hostage.UPLOAD_PROGRESS";

	public static final int RECORD_UPLOADED = 0x00;
	public static final int SYNC_COMPLETE = 0x01;
    public static final int SYNC_ERROR = 0x02;

	private HttpClient httpClient;
	private ResultReceiver receiver;

	HostageDBOpenHelper dbh;

	SharedPreferences pref;
	Editor editor;

	public TracingSyncService() {
		super(TracingSyncService.class.getName());

	}

	@Override
	public void onCreate() {
		super.onCreate();
		pref = PreferenceManager.getDefaultSharedPreferences(this);
		editor = pref.edit();
		dbh = new HostageDBOpenHelper(this);
	}

	/**
	 * The IntentService calls this method from the default worker thread with
	 * the intent that started the service. When this method returns,
	 * IntentService stops the service, as appropriate.
	 */
	@Override
	protected void onHandleIntent(Intent intent) {
		if (intent != null) {
			final String action = intent.getAction();
			if (ACTION_START_SYNC.equals(action)) {
				receiver = intent.getParcelableExtra(EXTRA_RECEIVER);
				syncNewRecords();
				dbh.clearSyncInfos();
				if (receiver != null) {
					receiver.send(SYNC_COMPLETE, null);
				}
			}

		}
	}

	/**
	 * Uploads all new Records to a server, specified in the settings.
	 */
	private void syncNewRecords() {
        long lastSyncTime = pref.getLong("LAST_SYNC_TIME", 0);

		String serverAddress = pref.getString("pref_upload_server", "https://ssi.cased.de"); //"https://192.168.1.118:9999"

        LogFilter filter = new LogFilter();
        filter.setAboveTimestamp(lastSyncTime);

        ArrayList<Record> records = dbh.getRecordsForFilter(filter);
        StringWriter writer = new StringWriter();

		int size = records.size();
		int offset = 1;
        int currOffset = 1;

        boolean error = false;
		for (Record record : records) {
            SyncUtils.appendRecordToStringWriter(record, writer);

            if(currOffset == 5 || offset == size){
                boolean success = SyncUtils.uploadRecordsToServer(writer.toString(), serverAddress);
                Log.i("Tracing upload", "Upload of record: " + offset + "/" + size + ((success) ? " successful." : " failed."));

                if(!success){
                    if(receiver != null){
                        receiver.send(SYNC_ERROR, null);
                        error = true;
                    }
                    break;
                }

                if (receiver != null) {
                    Bundle data = new Bundle();
                    data.putInt(UPLOAD_SIZE, size);
                    data.putInt(UPLOAD_PROGRESS, offset);
                    receiver.send(RECORD_UPLOADED, data);
                }

                writer.getBuffer().setLength(0);
                currOffset = 0;
            }

            offset++;
            currOffset++;
		}

        if(!error) pref.edit().putLong("LAST_SYNC_TIME", System.currentTimeMillis()).apply();
	}


	/**
	 * Gets the data from the server and updates the database.
	 */
	private void getRemoteData(String bssid, long timestamp) {
		HttpURLConnection connection;
		OutputStreamWriter request = null;
		URL url = null;
		String response = null;
		String parameters = "bssid=" + bssid;
		try {
			url = new URL("http://87.230.23.240/hostage/pull.php");
			connection = (HttpURLConnection) url.openConnection();
			connection.setDoOutput(true);
			connection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
			connection.setRequestMethod("POST");

			request = new OutputStreamWriter(connection.getOutputStream());
			request.write(parameters);
			request.flush();
			request.close();
			String line = "";

			InputStreamReader isr = new InputStreamReader(connection.getInputStream());
			BufferedReader reader = new BufferedReader(isr);
			StringBuilder sb = new StringBuilder();
			while ((line = reader.readLine()) != null) {
				sb.append(line);
			}
			response = sb.toString();
			JSONObject jsonObj = new JSONObject(response);
				NetworkRecord net = new NetworkRecord();
				net.setBssid(jsonObj.getString("bssid"));
				net.setSsid(jsonObj.getString("ssid"));
				net.setLatitude(jsonObj.getDouble("latitude"));
				net.setLongitude(jsonObj.getDouble("longitude"));
				net.setTimestampLocation(jsonObj.getLong("timestamp"));
				SyncInfoRecord sync = new SyncInfoRecord();
				sync.setBSSID(jsonObj.getString("bssid"));
				sync.setDeviceID("-1");
				sync.setNumber_of_attacks(jsonObj.getLong("attacks"));
				sync.setNumber_of_portscans(jsonObj.getLong("portscans"));
				dbh.updateNetworkInformation(net);
			isr.close();
			reader.close();
		} catch (IOException e) {
			Log.i("NetworkTest", "Network Error: " + e);
		} catch (JSONException e) {
			e.printStackTrace();
		}
	}
}