/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms.mms;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.net.http.AndroidHttpClient;
import android.util.Log;

import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ByteArrayEntity;
import org.whispersystems.textsecure.util.Util;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import ws.com.google.android.mms.pdu.PduParser;
import ws.com.google.android.mms.pdu.SendConf;

public class MmsSendHelper extends MmsCommunication {
  private final static String TAG = MmsSendHelper.class.getSimpleName();

  private static byte[] makePost(Context context, String url, String proxy, int proxyPort, byte[] mms)
      throws IOException
  {
    AndroidHttpClient client = null;

    try {
      Log.w(TAG, "Sending MMS1 of length: " + (mms != null ? mms.length : "null"));
      client                 = constructHttpClient(context, proxy, proxyPort);
      URI targetUrl          = new URI(url);

      if (Util.isEmpty(targetUrl.getHost()))
        throw new IOException("Invalid target host: " + targetUrl.getHost() + " , " + targetUrl);

      HttpHost target        = new HttpHost(targetUrl.getHost(), targetUrl.getPort(), HttpHost.DEFAULT_SCHEME_NAME);
      HttpPost request       = new HttpPost(url);
      ByteArrayEntity entity = new ByteArrayEntity(mms);

      entity.setContentType("application/vnd.wap.mms-message");

      request.setEntity(entity);
      request.setParams(client.getParams());
      request.addHeader("Accept", "*/*, application/vnd.wap.mms-message, application/vnd.wap.sic");
      request.addHeader("x-wap-profile", "http://www.google.com/oha/rdf/ua-profile-kila.xml");
      HttpResponse response = client.execute(target, request);
      StatusLine status     = response.getStatusLine();

      if (status.getStatusCode() != 200)
        throw new IOException("Non-successful HTTP response: " + status.getReasonPhrase());

      return parseResponse(response.getEntity());
    } catch (URISyntaxException use) {
      Log.w(TAG, use);
      throw new IOException("Couldn't parse URI.");
    } finally {
      if (client != null)
        client.close();
    }
  }

  public static void sendNotificationReceived(Context context, byte[] mms, String apn,
                                              boolean usingMmsRadio, boolean useProxyIfAvailable)
    throws IOException
  {
    sendBytes(context, mms, apn, usingMmsRadio, useProxyIfAvailable);
  }

  public static SendConf sendMms(Context context, byte[] mms, String apn,
                                 boolean usingMmsRadio, boolean useProxyIfAvailable)
      throws IOException
  {
    byte[] response = sendBytes(context, mms, apn, usingMmsRadio, useProxyIfAvailable);
    return (SendConf) new PduParser(response).parse();
  }

  private static byte[] sendBytes(Context context, byte[] mms, String apn,
                                  boolean usingMmsRadio, boolean useProxyIfAvailable)
    throws IOException
  {
    Log.w(TAG, "Sending MMS of length: " + mms.length);
    try {
      MmsConnectionParameters parameters = getMmsConnectionParameters(context, apn);
      for (MmsConnectionParameters.Apn param : parameters.get()) {
        String  proxy     = null;
        int     proxyPort = 80;
        boolean hasRoute;

        if(useProxyIfAvailable && param.hasProxy()){
          proxy     = param.getProxy();
          proxyPort = param.getPort();
          hasRoute  = checkRouteToHost(context, proxy, usingMmsRadio);
        } else {
          hasRoute = checkRouteToHost(context, Uri.parse(param.getMmsc()).getHost(), usingMmsRadio);
        }

        if (hasRoute) {
          try {
            byte[] response = makePost(context, param.getMmsc(), proxy, proxyPort, mms);
            if (response != null) return response;
          } catch(IOException e) {
            Log.w("MmsSendHelper", "Request failed: "+e.getMessage());
          }
        }
      }
      throw new IOException("Connection manager could not obtain route to host.");
    } catch (ApnUnavailableException aue) {
      Log.w(TAG, aue);
      throw new IOException("Failed to get MMSC information...");
    }
  }

  public static boolean hasNecessaryApnDetails(Context context) {
    try {
      ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo         networkInfo         = connectivityManager.getNetworkInfo(MmsRadio.TYPE_MOBILE_MMS);
      if (networkInfo == null) {
        Log.w(TAG, "MMS network info was null, unsupported by this device");
        return false;
      }
      String apn = networkInfo.getExtraInfo();

      MmsCommunication.getMmsConnectionParameters(context, apn);
      return true;
    } catch (ApnUnavailableException e) {
      Log.w("MmsSendHelper", e);
      return false;
    }
  }
}