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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* SPDX-License-Identifier: GPL-2.0-or-later
*/
package com.wireguard.android.preference;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.preference.Preference;
import android.system.OsConstants;
import android.util.AttributeSet;
import com.wireguard.android.Application;
import com.wireguard.android.Application.ApplicationComponent;
import com.wireguard.android.R;
import com.wireguard.android.util.AsyncWorker;
import com.wireguard.android.util.ToolsInstaller;
/**
* Preference implementing a button that asynchronously runs {@code ToolsInstaller} and displays the
* result as the preference summary.
*/
public class ToolsInstallerPreference extends Preference {
private final AsyncWorker asyncWorker;
private final ToolsInstaller toolsInstaller;
private State state = State.INITIAL;
@SuppressWarnings({"SameParameterValue", "WeakerAccess"})
public ToolsInstallerPreference(final Context context, final AttributeSet attrs) {
super(context, attrs);
final ApplicationComponent applicationComponent = Application.getComponent();
asyncWorker = applicationComponent.getAsyncWorker();
toolsInstaller = applicationComponent.getToolsInstaller();
}
@Override
public CharSequence getSummary() {
return getContext().getString(state.messageResourceId);
}
@Override
public CharSequence getTitle() {
return getContext().getString(R.string.tools_installer_title);
}
@Override
public void onAttached() {
super.onAttached();
asyncWorker.supplyAsync(toolsInstaller::areInstalled).whenComplete(this::onCheckResult);
}
private void onCheckResult(final Integer result, final Throwable throwable) {
setState(throwable == null && result == OsConstants.EALREADY ?
State.ALREADY : State.INITIAL);
}
@Override
protected void onClick() {
setState(State.WORKING);
asyncWorker.supplyAsync(toolsInstaller::install).whenComplete(this::onInstallResult);
}
private void onInstallResult(final Integer result, final Throwable throwable) {
final State nextState;
if (throwable != null)
nextState = State.FAILURE;
else if (result == OsConstants.EXIT_SUCCESS)
nextState = State.SUCCESS;
else if (result == OsConstants.EALREADY)
nextState = State.ALREADY;
else
nextState = State.FAILURE;
setState(nextState);
}
private void setState(@NonNull final State state) {
if (this.state == state)
return;
this.state = state;
if (isEnabled() != state.shouldEnableView)
setEnabled(state.shouldEnableView);
notifyChanged();
}
private enum State {
ALREADY(R.string.tools_installer_already, false),
FAILURE(R.string.tools_installer_failure, true),
INITIAL(R.string.tools_installer_initial, true),
SUCCESS(R.string.tools_installer_success, false),
WORKING(R.string.tools_installer_working, false);
private final int messageResourceId;
private final boolean shouldEnableView;
State(final int messageResourceId, final boolean shouldEnableView) {
this.messageResourceId = messageResourceId;
this.shouldEnableView = shouldEnableView;
}
}
}
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