/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.tv.settings.accessibility;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v14.preference.SwitchPreference;
import android.support.v17.preference.LeanbackPreferenceFragment;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;
import android.support.v7.preference.TwoStatePreference;
import android.text.TextUtils;

import com.android.settingslib.accessibility.AccessibilityUtils;
import com.android.tv.settings.R;

import java.util.Set;

/**
 * Fragment for controlling accessibility service
 */
public class AccessibilityServiceFragment extends LeanbackPreferenceFragment implements
        AccessibilityServiceConfirmationFragment.OnAccessibilityServiceConfirmedListener {
    private static final String ARG_PACKAGE_NAME = "packageName";
    private static final String ARG_SERVICE_NAME = "serviceName";
    private static final String ARG_SETTINGS_ACTIVITY_NAME = "settingsActivityName";
    private static final String ARG_LABEL = "label";

    private TwoStatePreference mEnablePref;

    /**
     * Put args in bundle
     * @param args Bundle to prepare
     * @param packageName Package of accessibility service
     * @param serviceName Class of accessibility service
     * @param activityName Class of accessibility service settings activity
     * @param label Screen title
     */
    public static void prepareArgs(@NonNull Bundle args, String packageName, String serviceName,
            String activityName, String label) {
        args.putString(ARG_PACKAGE_NAME, packageName);
        args.putString(ARG_SERVICE_NAME, serviceName);
        args.putString(ARG_SETTINGS_ACTIVITY_NAME, activityName);
        args.putString(ARG_LABEL, label);
    }

    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        final Context themedContext = getPreferenceManager().getContext();
        final PreferenceScreen screen =
                getPreferenceManager().createPreferenceScreen(themedContext);
        screen.setTitle(getArguments().getString(ARG_LABEL));

        mEnablePref = new SwitchPreference(themedContext);
        mEnablePref.setTitle(R.string.system_accessibility_status);
        mEnablePref.setFragment(AccessibilityServiceConfirmationFragment.class.getName());
        screen.addPreference(mEnablePref);

        final Preference settingsPref = new Preference(themedContext);
        settingsPref.setTitle(R.string.system_accessibility_config);
        final String activityName = getArguments().getString(ARG_SETTINGS_ACTIVITY_NAME);
        if (!TextUtils.isEmpty(activityName)) {
            final String packageName = getArguments().getString(ARG_PACKAGE_NAME);
            settingsPref.setIntent(new Intent(Intent.ACTION_MAIN)
                    .setComponent(new ComponentName(packageName, activityName)));
        } else {
            settingsPref.setEnabled(false);
        }
        screen.addPreference(settingsPref);

        setPreferenceScreen(screen);
    }

    @Override
    public void onResume() {
        super.onResume();

        final String packageName = getArguments().getString(ARG_PACKAGE_NAME);
        final String serviceName = getArguments().getString(ARG_SERVICE_NAME);

        final ComponentName serviceComponent = new ComponentName(packageName, serviceName);
        final Set<ComponentName> enabledServices =
                AccessibilityUtils.getEnabledServicesFromSettings(getActivity());
        final boolean enabled = enabledServices.contains(serviceComponent);

        mEnablePref.setChecked(enabled);
        AccessibilityServiceConfirmationFragment.prepareArgs(mEnablePref.getExtras(),
                new ComponentName(packageName, serviceName),
                getArguments().getString(ARG_LABEL), !enabled);
    }

    @Override
    public void onAccessibilityServiceConfirmed(ComponentName componentName, boolean enabling) {
        AccessibilityUtils.setAccessibilityServiceState(getActivity(),
                componentName, enabling);
    }
}