package org.thoughtcrime.securesms.jobs;

import android.support.annotation.NonNull;

import org.thoughtcrime.securesms.crypto.UnidentifiedAccessUtil;
import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.database.RecipientDatabase;
import org.thoughtcrime.securesms.database.RecipientDatabase.RecipientReader;
import org.thoughtcrime.securesms.dependencies.InjectableType;
import org.thoughtcrime.securesms.jobmanager.Data;
import org.thoughtcrime.securesms.jobmanager.Job;
import org.thoughtcrime.securesms.jobmanager.impl.NetworkConstraint;
import org.thoughtcrime.securesms.logging.Log;
import org.thoughtcrime.securesms.recipients.Recipient;
import org.thoughtcrime.securesms.util.GroupUtil;
import org.thoughtcrime.securesms.util.TextSecurePreferences;
import org.whispersystems.signalservice.api.SignalServiceMessageSender;
import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
import org.whispersystems.signalservice.api.messages.multidevice.BlockedListMessage;
import org.whispersystems.signalservice.api.messages.multidevice.SignalServiceSyncMessage;
import org.whispersystems.signalservice.api.push.exceptions.PushNetworkException;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import javax.inject.Inject;

public class MultiDeviceBlockedUpdateJob extends BaseJob implements InjectableType {

  public static final String KEY = "MultiDeviceBlockedUpdateJob";

  @SuppressWarnings("unused")
  private static final String TAG = MultiDeviceBlockedUpdateJob.class.getSimpleName();

  @Inject SignalServiceMessageSender messageSender;

  public MultiDeviceBlockedUpdateJob() {
    this(new Job.Parameters.Builder()
                           .addConstraint(NetworkConstraint.KEY)
                           .setQueue("MultiDeviceBlockedUpdateJob")
                           .setLifespan(TimeUnit.DAYS.toMillis(1))
                           .setMaxAttempts(Parameters.UNLIMITED)
                           .build());
  }

  private MultiDeviceBlockedUpdateJob(@NonNull Job.Parameters parameters) {
    super(parameters);
  }

  @Override
  public @NonNull Data serialize() {
    return Data.EMPTY;
  }

  @Override
  public @NonNull String getFactoryKey() {
    return KEY;
  }

  @Override
  public void onRun()
      throws IOException, UntrustedIdentityException
  {
    if (!TextSecurePreferences.isMultiDevice(context)) {
      Log.i(TAG, "Not multi device, aborting...");
      return;
    }

    RecipientDatabase database = DatabaseFactory.getRecipientDatabase(context);

    try (RecipientReader reader = database.readerForBlocked(database.getBlocked())) {
      List<String> blockedIndividuals = new LinkedList<>();
      List<byte[]> blockedGroups      = new LinkedList<>();

      Recipient recipient;

      while ((recipient = reader.getNext()) != null) {
        if (recipient.isGroupRecipient()) {
          blockedGroups.add(GroupUtil.getDecodedId(recipient.getAddress().toGroupString()));
        } else {
          blockedIndividuals.add(recipient.getAddress().serialize());
        }
      }

      // TODO: Message ID
      messageSender.sendMessage(0, SignalServiceSyncMessage.forBlocked(new BlockedListMessage(blockedIndividuals, blockedGroups)),
                                UnidentifiedAccessUtil.getAccessForSync(context));
    }
  }

  @Override
  public boolean onShouldRetry(@NonNull Exception exception) {
    if (exception instanceof PushNetworkException) return true;
    return false;
  }

  @Override
  public void onCanceled() {
  }

  public static final class Factory implements Job.Factory<MultiDeviceBlockedUpdateJob> {
    @Override
    public @NonNull MultiDeviceBlockedUpdateJob create(@NonNull Parameters parameters, @NonNull Data data) {
      return new MultiDeviceBlockedUpdateJob(parameters);
    }
  }
}