Mercury-IM/app/src/main/java/org/mercury_im/messenger/ui/MainActivity.java

package org.mercury_im.messenger.ui;

import androidx.lifecycle.Observer;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import androidx.annotation.Nullable;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import org.mercury_im.messenger.MercuryImApplication;
import org.mercury_im.messenger.R;
import org.mercury_im.messenger.persistence.model.AccountModel;
import org.mercury_im.messenger.persistence.room.AppDatabase;
import org.mercury_im.messenger.persistence.room.model.RoomContactModel;
import org.mercury_im.messenger.persistence.repository.AccountRepository;
import org.mercury_im.messenger.persistence.repository.ContactRepository;
import org.mercury_im.messenger.ui.chat.ChatActivity;
import org.mercury_im.messenger.ui.login.AccountsActivity;
import org.mercury_im.messenger.ui.login.LoginActivity;
import org.mercury_im.messenger.ui.settings.SettingsActivity;

import java.util.List;

import javax.inject.Inject;

public class MainActivity extends AppCompatActivity {


    @Inject
    public AccountRepository accountRepository;

    @Inject
    public ContactRepository contactRepository;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        MercuryImApplication.getApplication().getAppComponent().inject(this);

        FloatingActionButton fab = findViewById(R.id.fab);

        accountRepository.getAllAccountsLive().observe(this, new Observer<List<AccountModel>>() {
            @Override
            public void onChanged(@Nullable List<AccountModel> accountModels) {
                if (accountModels == null || accountModels.isEmpty()) {
                    startActivity(new Intent(getApplicationContext(), LoginActivity.class));
                }
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();

        switch (id) {
            case R.id.action_settings:
                startActivity(new Intent(getApplicationContext(), SettingsActivity.class));
                return true;

            case R.id.action_login:
                startActivity(new Intent(getApplicationContext(), LoginActivity.class));
                return true;

            case R.id.action_chat:
                startActivity(new Intent(getApplicationContext(), ChatActivity.class));
                return true;

            case R.id.action_accounts:
                startActivity(new Intent(getApplicationContext(), AccountsActivity.class));
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void addRosterEntry(AppDatabase database, RoomContactModel rosterEntry) {
        new addRosterEntry(database).execute(rosterEntry);
    }

    private static class addRosterEntry extends AsyncTask<RoomContactModel, Void, Void> {

        private AppDatabase database;

        public addRosterEntry(AppDatabase database) {
            this.database = database;
        }

        @Override
        protected Void doInBackground(RoomContactModel... rosterEntryModels) {
            database.rosterEntryDao().insert(rosterEntryModels[0]);
            return null;
        }
    }

}