TM-SIGNAL-Android / app / src / main / java / org / tm / archive / MainNavigator.java

package org.tm.archive;

import android.app.Activity;
import android.content.Intent;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;

import org.signal.core.util.concurrent.LifecycleDisposable;
import org.tm.archive.components.settings.app.AppSettingsActivity;
import org.tm.archive.conversation.ConversationIntents;
import org.tm.archive.groups.ui.creategroup.CreateGroupActivity;
import org.tm.archive.recipients.RecipientId;

import io.reactivex.rxjava3.disposables.Disposable;

public class MainNavigator {

  public static final int REQUEST_CONFIG_CHANGES = 901;

  private final MainActivity        activity;
  private final LifecycleDisposable lifecycleDisposable;

  public MainNavigator(@NonNull MainActivity activity) {
    this.activity            = activity;
    this.lifecycleDisposable = new LifecycleDisposable();

    lifecycleDisposable.bindTo(activity);
  }

  public static MainNavigator get(@NonNull Activity activity) {
    if (!(activity instanceof MainActivity)) {
      throw new IllegalArgumentException("Activity must be an instance of MainActivity!");
    }

    return ((MainActivity) activity).getNavigator();
  }

  /**
   * @return True if the back pressed was handled in our own custom way, false if it should be given
   * to the system to do the default behavior.
   */
  public boolean onBackPressed() {
    Fragment fragment = getFragmentManager().findFragmentById(R.id.fragment_container);

    if (fragment instanceof BackHandler) {
      return ((BackHandler) fragment).onBackPressed();
    }

    return false;
  }

  public void goToConversation(@NonNull RecipientId recipientId, long threadId, int distributionType, int startingPosition) {
    Disposable disposable = ConversationIntents.createBuilder(activity, recipientId, threadId)
                                               .map(builder -> builder.withDistributionType(distributionType)
                                                                      .withStartingPosition(startingPosition)
                                                                      .build())
                                               .subscribe(intent -> {
                                                 activity.startActivity(intent);
                                                 activity.overridePendingTransition(R.anim.slide_from_end, R.anim.fade_scale_out);
                                               });

    lifecycleDisposable.add(disposable);
  }

  public void goToAppSettings() {
    activity.startActivityForResult(AppSettingsActivity.home(activity), REQUEST_CONFIG_CHANGES);
  }

  public void goToGroupCreation() {
    activity.startActivity(CreateGroupActivity.newIntent(activity));
  }

  public void goToInvite() {
    Intent intent = new Intent(activity, InviteActivity.class);
    activity.startActivity(intent);
  }

  private @NonNull FragmentManager getFragmentManager() {
    return activity.getSupportFragmentManager();
  }

  public interface BackHandler {
    /**
     * @return True if the back pressed was handled in our own custom way, false if it should be given
     * to the system to do the default behavior.
     */
    boolean onBackPressed();
  }
}