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

package org.olomono.messenger.ui;

import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import org.jxmpp.jid.impl.JidCreate;
import org.olomono.messenger.MessengerApplication;
import org.olomono.messenger.R;
import org.olomono.messenger.di.component.DaggerAppComponent;
import org.olomono.messenger.di.module.AppModule;
import org.olomono.messenger.di.module.RoomModule;
import org.olomono.messenger.persistence.database.AppDatabase;
import org.olomono.messenger.persistence.database.model.AccountModel;
import org.olomono.messenger.persistence.database.model.RosterEntryModel;
import org.olomono.messenger.persistence.repository.account.AccountRepository;
import org.olomono.messenger.persistence.repository.roster.RosterEntryRepository;
import org.olomono.messenger.ui.chat.ChatActivity;
import org.olomono.messenger.ui.login.LoginActivity;
import org.olomono.messenger.ui.settings.SettingsActivity;

import java.util.List;

import javax.inject.Inject;

public class MainActivity extends AppCompatActivity {

    @Inject
    public AccountRepository accountRepository;

    @Inject
    public RosterEntryRepository rosterEntryRepository;

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

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

        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AccountModel account = new AccountModel();
                account.setJid(JidCreate.entityBareFromOrThrowUnchecked("alice@wonderland.lit"));
                account.setPassword("swordfish");

                accountRepository.insertAccount(account);
            }
        });
    }

    @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;
        }

        return super.onOptionsItemSelected(item);
    }

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

    private static class ifNoAccountsThen extends AsyncTask<Runnable, Void, Void> {

        private final AppDatabase database;

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

        @Override
        protected Void doInBackground(Runnable... runnables) {
            List<AccountModel> accounts = database.accountDao().getAllAccounts().getValue();
            if (accounts == null || accounts.size() == 0) {
                runnables[0].run();
            }
            return null;
        }
    }

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

        private AppDatabase database;

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

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

}