/*
 * Copyright (C) 2011 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.settings.location;

import android.app.Activity;
import android.content.Context;
import android.location.SettingInjectorService;
import android.os.Bundle;
import android.provider.SearchIndexableResource;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceGroup;

import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.SettingsActivity;
import com.android.settings.dashboard.DashboardFragment;
import com.android.settings.dashboard.SummaryLoader;
import com.android.settings.search.BaseSearchIndexProvider;
import com.android.settings.search.Indexable;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.settingslib.core.lifecycle.Lifecycle;
import com.android.settingslib.location.RecentLocationApps;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * System location settings (Settings > Location). The screen has three parts:
 * <ul>
 *     <li>Platform location controls</li>
 *     <ul>
 *         <li>In switch bar: location master switch. Used to toggle
 *         {@link android.provider.Settings.Secure#LOCATION_MODE} between
 *         {@link android.provider.Settings.Secure#LOCATION_MODE_OFF} and another location mode.
 *         </li>
 *         <li>Mode preference: only available if the master switch is on, selects between
 *         {@link android.provider.Settings.Secure#LOCATION_MODE} of
 *         {@link android.provider.Settings.Secure#LOCATION_MODE_HIGH_ACCURACY},
 *         {@link android.provider.Settings.Secure#LOCATION_MODE_BATTERY_SAVING}, or
 *         {@link android.provider.Settings.Secure#LOCATION_MODE_SENSORS_ONLY}.</li>
 *     </ul>
 *     <li>Recent location requests: automatically populated by {@link RecentLocationApps}</li>
 *     <li>Location services: multi-app settings provided from outside the Android framework. Each
 *     is injected by a system-partition app via the {@link SettingInjectorService} API.</li>
 * </ul>
 * <p>
 * Note that as of KitKat, the {@link SettingInjectorService} is the preferred method for OEMs to
 * add their own settings to this page, rather than directly modifying the framework code. Among
 * other things, this simplifies integration with future changes to the default (AOSP)
 * implementation.
 */
public class LocationSettings extends DashboardFragment {

    private static final String TAG = "LocationSettings";

    private LocationSwitchBarController mSwitchBarController;

    @Override
    public int getMetricsCategory() {
        return MetricsEvent.LOCATION;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        final SettingsActivity activity = (SettingsActivity) getActivity();
        mSwitchBarController = new LocationSwitchBarController(
                activity, activity.getSwitchBar(), getLifecycle());
    }

    @Override
    protected int getPreferenceScreenResId() {
        return R.xml.location_settings;
    }

    @Override
    protected String getLogTag() {
        return TAG;
    }

    @Override
    protected List<AbstractPreferenceController> getPreferenceControllers(Context context) {
        return buildPreferenceControllers(context, this, getLifecycle());
    }

    static void addPreferencesSorted(List<Preference> prefs, PreferenceGroup container) {
        // If there's some items to display, sort the items and add them to the container.
        Collections.sort(prefs, new Comparator<Preference>() {
            @Override
            public int compare(Preference lhs, Preference rhs) {
                return lhs.getTitle().toString().compareTo(rhs.getTitle().toString());
            }
        });
        for (Preference entry : prefs) {
            container.addPreference(entry);
        }
    }

    @Override
    public int getHelpResource() {
        return R.string.help_url_location_access;
    }

    private static List<AbstractPreferenceController> buildPreferenceControllers(
            Context context, LocationSettings fragment, Lifecycle lifecycle) {
        final List<AbstractPreferenceController> controllers = new ArrayList<>();
        controllers.add(new LocationModePreferenceController(context, fragment, lifecycle));
        controllers.add(new AppLocationPermissionPreferenceController(context));
        controllers.add(new LocationForWorkPreferenceController(context, lifecycle));
        controllers.add(
                new RecentLocationRequestPreferenceController(context, fragment, lifecycle));
        controllers.add(
                new LocationServicePreferenceController(context, fragment, lifecycle));
        return controllers;
    }

    private static class SummaryProvider implements SummaryLoader.SummaryProvider {

        private final Context mContext;
        private final SummaryLoader mSummaryLoader;

        public SummaryProvider(Context context, SummaryLoader summaryLoader) {
            mContext = context;
            mSummaryLoader = summaryLoader;
        }

        @Override
        public void setListening(boolean listening) {
            if (listening) {
                mSummaryLoader.setSummary(
                    this, LocationPreferenceController.getLocationSummary(mContext));
            }
        }
    }

    public static final SummaryLoader.SummaryProviderFactory SUMMARY_PROVIDER_FACTORY
            = new SummaryLoader.SummaryProviderFactory() {
        @Override
        public SummaryLoader.SummaryProvider createSummaryProvider(Activity activity,
                                                                   SummaryLoader summaryLoader) {
            return new SummaryProvider(activity, summaryLoader);
        }
    };

    /**
     * For Search.
     */
    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
            new BaseSearchIndexProvider() {
                @Override
                public List<SearchIndexableResource> getXmlResourcesToIndex(
                        Context context, boolean enabled) {
                    final SearchIndexableResource sir = new SearchIndexableResource(context);
                    sir.xmlResId = R.xml.location_settings;
                    return Arrays.asList(sir);
                }

                @Override
                public List<AbstractPreferenceController> getPreferenceControllers(Context
                        context) {
                    return buildPreferenceControllers(context, null /* fragment */,
                            null /* lifecycle */);
                }
            };
}