FairEmail/app/src/main/java/eu/faircode/email/ActivitySetup.java

package eu.faircode.email;

/*
    This file is part of FairEmail.

    FairEmail is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    FairEmail is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018 by Marcel Bokhorst (M66B)
*/

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.MenuItem;

import java.util.List;

import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.Observer;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;

public class ActivitySetup extends ActivityBilling implements FragmentManager.OnBackStackChangedListener {
    private boolean hasAccount;

    static final int REQUEST_PERMISSION = 1;
    static final int REQUEST_CHOOSE_ACCOUNT = 2;

    static final int REQUEST_SOUND = 3;

    static final int REQUEST_EXPORT = 4;
    static final int REQUEST_IMPORT = 5;

    static final int REQUEST_ERROR = 6;

    static final String ACTION_EDIT_ACCOUNT = BuildConfig.APPLICATION_ID + ".EDIT_ACCOUNT";
    static final String ACTION_EDIT_IDENTITY = BuildConfig.APPLICATION_ID + ".EDIT_IDENTITY";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_setup);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        getSupportFragmentManager().addOnBackStackChangedListener(this);

        if (getSupportFragmentManager().getFragments().size() == 0) {
            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.content_frame, new FragmentSetup()).addToBackStack("setup");
            fragmentTransaction.commit();
        }

        DB.getInstance(this).account().liveAccounts(true).observe(this, new Observer<List<TupleAccountEx>>() {
            @Override
            public void onChanged(List<TupleAccountEx> accounts) {
                hasAccount = (accounts != null && accounts.size() > 0);
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
        IntentFilter iff = new IntentFilter();
        iff.addAction(ACTION_EDIT_ACCOUNT);
        iff.addAction(ACTION_EDIT_IDENTITY);
        lbm.registerReceiver(receiver, iff);
    }

    @Override
    protected void onPause() {
        super.onPause();
        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
        lbm.unregisterReceiver(receiver);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
                    getSupportFragmentManager().popBackStack();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onBackStackChanged() {
        if (getSupportFragmentManager().getBackStackEntryCount() == 0) {
            if (hasAccount)
                startActivity(new Intent(this, ActivityView.class));
            finish();
        }
    }

    BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (ACTION_EDIT_ACCOUNT.equals(intent.getAction())) {
                FragmentAccount fragment = new FragmentAccount();
                fragment.setArguments(intent.getExtras());
                FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("account");
                fragmentTransaction.commit();
            } else if (ACTION_EDIT_IDENTITY.equals(intent.getAction())) {
                FragmentIdentity fragment = new FragmentIdentity();
                fragment.setArguments(intent.getExtras());
                FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("identity");
                fragmentTransaction.commit();
            }
        }
    };
}