package org.thoughtcrime.securesms;

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v7.app.AlertDialog;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;

import com.melnykov.fab.FloatingActionButton;

import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.database.loaders.DeviceListLoader;
import org.thoughtcrime.securesms.dependencies.InjectableType;
import org.thoughtcrime.securesms.devicelist.Device;
import org.thoughtcrime.securesms.loki.DeviceListBottomSheetFragment;
import org.thoughtcrime.securesms.loki.MnemonicUtilities;
import org.thoughtcrime.securesms.util.TextSecurePreferences;
import org.thoughtcrime.securesms.util.ViewUtil;
import org.whispersystems.libsignal.util.guava.Function;

import java.io.File;
import java.util.List;
import java.util.Locale;

import kotlin.Pair;
import kotlin.Unit;
import network.loki.messenger.R;

import static org.thoughtcrime.securesms.loki.GeneralUtilitiesKt.toPx;

public class DeviceListFragment extends ListFragment
    implements LoaderManager.LoaderCallbacks<List<Device>>,
               ListView.OnItemClickListener, InjectableType, Button.OnClickListener
{

  private static final String TAG = DeviceListFragment.class.getSimpleName();

  private File                   languageFileDirectory;
  private Locale                 locale;
  private View                   empty;
  private View                   progressContainer;
  private FloatingActionButton   addDeviceButton;
  private Button.OnClickListener addDeviceButtonListener;
  private Function<String, Void> handleDisconnectDevice;
  private Function<Pair<String, String>, Void> handleDeviceNameChange;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.locale = (Locale) getArguments().getSerializable(PassphraseRequiredActionBarActivity.LOCALE_EXTRA);
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    ApplicationContext.getInstance(activity).injectDependencies(this);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle) {
    View view = inflater.inflate(R.layout.device_list_fragment, container, false);

    this.empty             = view.findViewById(R.id.emptyStateTextView);
    this.progressContainer = view.findViewById(R.id.activityIndicator);
    this.addDeviceButton   = ViewUtil.findById(view, R.id.addDeviceButton);
    this.addDeviceButton.setOnClickListener(this);
    updateAddDeviceButtonVisibility();

    return view;
  }

  @Override
  public void onActivityCreated(Bundle bundle) {
    super.onActivityCreated(bundle);
    this.languageFileDirectory = MnemonicUtilities.getLanguageFileDirectory(getContext());
    getLoaderManager().initLoader(0, null, this);
    getListView().setOnItemClickListener(this);
  }

  public void setAddDeviceButtonListener(Button.OnClickListener listener) {
    this.addDeviceButtonListener = listener;
  }

  public void setHandleDisconnectDevice(Function<String, Void> handler) {
    this.handleDisconnectDevice = handler;
  }

  public void setHandleDeviceNameChange(Function<Pair<String, String>, Void> handler) {
    this.handleDeviceNameChange = handler;
  }

  @Override
  public @NonNull Loader<List<Device>> onCreateLoader(int id, Bundle args) {
    empty.setVisibility(View.GONE);
    progressContainer.setVisibility(View.VISIBLE);

    return new DeviceListLoader(getActivity(), languageFileDirectory);
  }

  @Override
  public void onLoadFinished(@NonNull Loader<List<Device>> loader, List<Device> data) {
    progressContainer.setVisibility(View.GONE);

    if (data == null) {
      handleLoaderFailed();
      return;
    }

    setListAdapter(new DeviceListAdapter(getActivity(), R.layout.device_list_item_view, data, locale));

    if (data.isEmpty()) {
      empty.setVisibility(View.VISIBLE);
      TextSecurePreferences.setMultiDevice(getActivity(), false);
    } else {
      empty.setVisibility(View.GONE);
    }
  }

  @Override
  public void onLoaderReset(@NonNull Loader<List<Device>> loader) {
    setListAdapter(null);
  }

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    final boolean hasDeviceName = ((DeviceListItem)view).hasDeviceName(); // Tells us whether the name is set to shortId or the device name
    final String deviceName = ((DeviceListItem)view).getDeviceName();
    final String deviceId   = ((DeviceListItem)view).getDeviceId();

    DeviceListBottomSheetFragment bottomSheet = new DeviceListBottomSheetFragment();
    bottomSheet.setOnEditTapped(() -> {
      bottomSheet.dismiss();
      EditText deviceNameEditText = new EditText(getContext());
      LinearLayout deviceNameEditTextContainer = new LinearLayout(getContext());
      LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
      layoutParams.setMarginStart(toPx(18, getResources()));
      layoutParams.setMarginEnd(toPx(18, getResources()));
      deviceNameEditText.setLayoutParams(layoutParams);
      deviceNameEditTextContainer.addView(deviceNameEditText);
      deviceNameEditText.setText(hasDeviceName ? deviceName : "");
      AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
      builder.setTitle(R.string.DeviceListActivity_edit_device_name);
      builder.setView(deviceNameEditTextContainer);
      builder.setNegativeButton(android.R.string.cancel, null);
      builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          if (handleDeviceNameChange != null) { handleDeviceNameChange.apply(new Pair<>(deviceId, deviceNameEditText.getText().toString().trim())); }
        }
      });
      builder.show();
      return Unit.INSTANCE;
    });
    bottomSheet.setOnUnlinkTapped(() -> {
      bottomSheet.dismiss();
      AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
      builder.setTitle(getActivity().getString(R.string.DeviceListActivity_unlink_s, deviceName));
      builder.setMessage(R.string.DeviceListActivity_by_unlinking_this_device_it_will_no_longer_be_able_to_send_or_receive);
      builder.setNegativeButton(android.R.string.cancel, null);
      builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          if (handleDisconnectDevice != null) { handleDisconnectDevice.apply(deviceId); }
        }
      });
      builder.show();
      return Unit.INSTANCE;
    });
    bottomSheet.show(getFragmentManager(), bottomSheet.getTag());
  }

  public void refresh() {
    updateAddDeviceButtonVisibility();
    getLoaderManager().restartLoader(0, null, DeviceListFragment.this);
  }

  private void updateAddDeviceButtonVisibility() {
    if (addDeviceButton != null) {
      String userHexEncodedPublicKey = TextSecurePreferences.getLocalNumber(getContext());
      boolean isDeviceLinkingEnabled = DatabaseFactory.getLokiAPIDatabase(getContext()).getPairingAuthorisations(userHexEncodedPublicKey).isEmpty();
      addDeviceButton.setVisibility(isDeviceLinkingEnabled ? View.VISIBLE : View.INVISIBLE);
    }
  }

  private void handleLoaderFailed() {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setMessage(R.string.DeviceListActivity_network_connection_failed);
    builder.setPositiveButton(R.string.DeviceListActivity_try_again,
                              new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        getLoaderManager().restartLoader(0, null, DeviceListFragment.this);
      }
    });

    builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        DeviceListFragment.this.getActivity().onBackPressed();
      }
    });
    builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
      @Override
      public void onCancel(DialogInterface dialog) {
        DeviceListFragment.this.getActivity().onBackPressed();
      }
    });

    builder.show();
  }

  @Override
  public void onClick(View v) {
    if (addDeviceButtonListener != null) addDeviceButtonListener.onClick(v);
  }

  private static class DeviceListAdapter extends ArrayAdapter<Device> {

    private final int    resource;
    private final Locale locale;

    public DeviceListAdapter(Context context, int resource, List<Device> objects, Locale locale) {
      super(context, resource, objects);
      this.resource = resource;
      this.locale = locale;
    }

    @Override
    public @NonNull View getView(int position, View convertView, @NonNull ViewGroup parent) {
      if (convertView == null) {
        convertView = ((Activity)getContext()).getLayoutInflater().inflate(resource, parent, false);
      }

      ((DeviceListItem)convertView).set(getItem(position), locale);

      return convertView;
    }
  }
}