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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
package com.wireguard.android.activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import com.wireguard.android.R;
import com.wireguard.android.fragment.TunnelDetailFragment;
import com.wireguard.android.fragment.TunnelEditorFragment;
import com.wireguard.android.fragment.TunnelListFragment;
import com.wireguard.android.model.Tunnel;
import java9.util.stream.Stream;
/**
* CRUD interface for WireGuard tunnels. This activity serves as the main entry point to the
* WireGuard application, and contains several fragments for listing, viewing details of, and
* editing the configuration and interface state of WireGuard tunnels.
*/
public class MainActivity extends BaseActivity {
private static final String KEY_STATE = "fragment_state";
private static final String TAG = "WireGuard/" + MainActivity.class.getSimpleName();
private State state = State.EMPTY;
private boolean moveToState(final State nextState) {
final FragmentManager fragmentManager = getSupportFragmentManager();
Log.i(TAG, "Moving from " + state.name() + " to " + nextState.name());
if (nextState == state) {
return false;
} else if (nextState.layer > state.layer + 1) {
moveToState(State.ofLayer(state.layer + 1));
moveToState(nextState);
return true;
} else if (nextState.layer == state.layer + 1) {
final Fragment fragment = Fragment.instantiate(this, nextState.fragment);
final FragmentTransaction transaction = fragmentManager.beginTransaction()
.replace(R.id.master_fragment, fragment)
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
if (state.layer > 0)
transaction.addToBackStack(null);
transaction.commit();
} else if (nextState.layer == state.layer - 1) {
if (fragmentManager.getBackStackEntryCount() == 0)
return false;
fragmentManager.popBackStack();
} else if (nextState.layer < state.layer - 1) {
moveToState(State.ofLayer(state.layer - 1));
moveToState(nextState);
return true;
}
state = nextState;
if (state.layer <= State.LIST.layer)
setSelectedTunnel(null);
updateActionBar();
return true;
}
@Override
public void onBackPressed() {
TunnelListFragment fragment = null;
try {
fragment =
((TunnelListFragment)
getSupportFragmentManager().getFragments().get(0));
} catch (final ClassCastException ignored) {
}
if (fragment == null || !(fragment.collapseActionMenu())) {
if (!moveToState(State.ofLayer(state.layer - 1)))
super.onBackPressed();
}
}
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
if (savedInstanceState != null && savedInstanceState.getString(KEY_STATE) != null)
state = State.valueOf(savedInstanceState.getString(KEY_STATE));
if (state == State.EMPTY) {
State initialState = getSelectedTunnel() != null ? State.DETAIL : State.LIST;
if (getIntent() != null && getIntent().getStringExtra(KEY_STATE) != null)
initialState = State.valueOf(getIntent().getStringExtra(KEY_STATE));
moveToState(initialState);
}
updateActionBar();
}
@Override
public boolean onCreateOptionsMenu(final Menu menu) {
getMenuInflater().inflate(R.menu.main_activity, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(final MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// The back arrow in the action bar should act the same as the back button.
moveToState(State.ofLayer(state.layer - 1));
return true;
case R.id.menu_action_edit:
if (getSelectedTunnel() != null)
moveToState(State.EDITOR);
return true;
case R.id.menu_action_save:
// This menu item is handled by the editor fragment.
return false;
case R.id.menu_settings:
startActivity(new Intent(this, SettingsActivity.class));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
protected void onSaveInstanceState(final Bundle outState) {
outState.putString(KEY_STATE, state.name());
super.onSaveInstanceState(outState);
}
@Override
protected void onSelectedTunnelChanged(final Tunnel oldTunnel, final Tunnel newTunnel) {
moveToState(newTunnel != null ? State.DETAIL : State.LIST);
}
private void updateActionBar() {
if (getSupportActionBar() != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(state.layer > State.LIST.layer);
}
private enum State {
EMPTY(null, 0),
LIST(TunnelListFragment.class, 1),
DETAIL(TunnelDetailFragment.class, 2),
EDITOR(TunnelEditorFragment.class, 3);
private final String fragment;
private final int layer;
State(final Class<? extends Fragment> fragment, final int layer) {
this.fragment = fragment != null ? fragment.getName() : null;
this.layer = layer;
}
private static State ofLayer(final int layer) {
return Stream.of(State.values()).filter(s -> s.layer == layer).findFirst().get();
}
}
}
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