/*
 * Copyright (C) 2022 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.fuelgauge.batteryusage;

import static com.android.settings.fuelgauge.BatteryBroadcastReceiver.BatteryUpdateType;

import android.app.Activity;
import android.app.settings.SettingsEnums;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.provider.Settings.Global;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import androidx.loader.app.LoaderManager;
import androidx.loader.content.Loader;
import androidx.preference.Preference;

import com.android.settings.R;
import com.android.settings.Utils;
import com.android.settings.fuelgauge.BatteryHeaderTextPreferenceController;
import com.android.settings.fuelgauge.BatteryInfo;
import com.android.settings.fuelgauge.BatteryInfoLoader;
import com.android.settings.fuelgauge.BatteryUtils;
import com.android.settings.fuelgauge.PowerUsageFeatureProvider;
import com.android.settings.fuelgauge.batterytip.BatteryTipLoader;
import com.android.settings.fuelgauge.batterytip.BatteryTipPreferenceController;
import com.android.settings.fuelgauge.batterytip.tips.BatteryTip;
import com.android.settings.overlay.FeatureFactory;
import com.android.settings.search.BaseSearchIndexProvider;
import com.android.settingslib.search.SearchIndexable;

import java.util.List;

/**
 * Displays a list of apps and subsystems that consume power, ordered by how much power was consumed
 * since the last time it was unplugged.
 */
@SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
public class PowerUsageSummary extends PowerUsageBase
        implements BatteryTipPreferenceController.BatteryTipListener {

    static final String TAG = "PowerUsageSummary";

    @VisibleForTesting static final String KEY_BATTERY_ERROR = "battery_help_message";
    @VisibleForTesting static final String KEY_BATTERY_USAGE = "battery_usage_summary";

    @VisibleForTesting PowerUsageFeatureProvider mPowerFeatureProvider;
    @VisibleForTesting BatteryUtils mBatteryUtils;
    @VisibleForTesting BatteryInfo mBatteryInfo;

    @VisibleForTesting BatteryHeaderTextPreferenceController mBatteryHeaderTextPreferenceController;
    @VisibleForTesting BatteryTipPreferenceController mBatteryTipPreferenceController;
    @VisibleForTesting boolean mNeedUpdateBatteryTip;
    @VisibleForTesting Preference mHelpPreference;
    @VisibleForTesting Preference mBatteryUsagePreference;

    @VisibleForTesting
    final ContentObserver mSettingsObserver =
            new ContentObserver(new Handler()) {
                @Override
                public void onChange(boolean selfChange, Uri uri) {
                    restartBatteryInfoLoader();
                }
            };

    @VisibleForTesting
    LoaderManager.LoaderCallbacks<BatteryInfo> mBatteryInfoLoaderCallbacks =
            new LoaderManager.LoaderCallbacks<BatteryInfo>() {

                @Override
                public Loader<BatteryInfo> onCreateLoader(int i, Bundle bundle) {
                    return new BatteryInfoLoader(getContext());
                }

                @Override
                public void onLoadFinished(Loader<BatteryInfo> loader, BatteryInfo batteryInfo) {
                    mBatteryHeaderTextPreferenceController.updateHeaderPreference(batteryInfo);
                    mBatteryHeaderTextPreferenceController.updateHeaderByBatteryTips(
                            mBatteryTipPreferenceController.getCurrentBatteryTip(), batteryInfo);
                    mBatteryInfo = batteryInfo;
                }

                @Override
                public void onLoaderReset(Loader<BatteryInfo> loader) {
                    // do nothing
                }
            };

    private LoaderManager.LoaderCallbacks<List<BatteryTip>> mBatteryTipsCallbacks =
            new LoaderManager.LoaderCallbacks<List<BatteryTip>>() {

                @Override
                public Loader<List<BatteryTip>> onCreateLoader(int id, Bundle args) {
                    return new BatteryTipLoader(getContext(), mBatteryUsageStats);
                }

                @Override
                public void onLoadFinished(Loader<List<BatteryTip>> loader, List<BatteryTip> data) {
                    mBatteryTipPreferenceController.updateBatteryTips(data);
                    mBatteryHeaderTextPreferenceController.updateHeaderByBatteryTips(
                            mBatteryTipPreferenceController.getCurrentBatteryTip(), mBatteryInfo);
                }

                @Override
                public void onLoaderReset(Loader<List<BatteryTip>> loader) {}
            };

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        final Activity activity = getActivity();

        mBatteryHeaderTextPreferenceController = use(BatteryHeaderTextPreferenceController.class);

        mBatteryTipPreferenceController = use(BatteryTipPreferenceController.class);
        mBatteryTipPreferenceController.setActivity(activity);
        mBatteryTipPreferenceController.setFragment(this);
        mBatteryTipPreferenceController.setBatteryTipListener(this::onBatteryTipHandled);
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setAnimationAllowed(true);

        initFeatureProvider();
        initPreference();

        mBatteryUtils = BatteryUtils.getInstance(getContext());

        if (Utils.isBatteryPresent(getContext())) {
            restartBatteryInfoLoader();
        } else {
            // Present help preference when battery is unavailable.
            mHelpPreference.setVisible(true);
        }
        mBatteryTipPreferenceController.restoreInstanceState(icicle);
        updateBatteryTipFlag(icicle);
    }

    @Override
    public void onResume() {
        super.onResume();
        getContentResolver()
                .registerContentObserver(
                        Global.getUriFor(Global.BATTERY_ESTIMATES_LAST_UPDATE_TIME),
                        false,
                        mSettingsObserver);
    }

    @Override
    public void onPause() {
        getContentResolver().unregisterContentObserver(mSettingsObserver);
        super.onPause();
    }

    @Override
    public int getMetricsCategory() {
        return SettingsEnums.FUELGAUGE_POWER_USAGE_SUMMARY_V2;
    }

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

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

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

    protected void refreshUi(@BatteryUpdateType int refreshType) {
        final Context context = getContext();
        if (context == null) {
            return;
        }
        // Skip refreshing UI if battery is not present.
        if (!mIsBatteryPresent) {
            return;
        }

        // Skip BatteryTipLoader if device is rotated or only battery level change
        if (mNeedUpdateBatteryTip && refreshType != BatteryUpdateType.BATTERY_LEVEL) {
            restartBatteryTipLoader();
        } else {
            mNeedUpdateBatteryTip = true;
        }
        // reload BatteryInfo and updateUI
        restartBatteryInfoLoader();
    }

    @VisibleForTesting
    void restartBatteryTipLoader() {
        restartLoader(LoaderIndex.BATTERY_TIP_LOADER, Bundle.EMPTY, mBatteryTipsCallbacks);
    }

    @VisibleForTesting
    void initFeatureProvider() {
        mPowerFeatureProvider = FeatureFactory.getFeatureFactory().getPowerUsageFeatureProvider();
    }

    @VisibleForTesting
    void initPreference() {
        mBatteryUsagePreference = findPreference(KEY_BATTERY_USAGE);
        mBatteryUsagePreference.setSummary(getString(R.string.advanced_battery_preference_summary));
        mBatteryUsagePreference.setVisible(mPowerFeatureProvider.isBatteryUsageEnabled());

        mHelpPreference = findPreference(KEY_BATTERY_ERROR);
        mHelpPreference.setVisible(false);
    }

    @VisibleForTesting
    void restartBatteryInfoLoader() {
        if (getContext() == null) {
            return;
        }
        // Skip restartBatteryInfoLoader if battery is not present.
        if (!mIsBatteryPresent) {
            return;
        }
        restartLoader(LoaderIndex.BATTERY_INFO_LOADER, Bundle.EMPTY, mBatteryInfoLoaderCallbacks);
    }

    @VisibleForTesting
    void updateBatteryTipFlag(Bundle icicle) {
        mNeedUpdateBatteryTip = icicle == null || mBatteryTipPreferenceController.needUpdate();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mBatteryTipPreferenceController.saveInstanceState(outState);
    }

    @Override
    public void onBatteryTipHandled(BatteryTip batteryTip) {
        restartBatteryTipLoader();
    }

    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
            new BaseSearchIndexProvider(R.xml.power_usage_summary);

    @Override
    public @Nullable String getPreferenceScreenBindingKey(@NonNull Context context) {
        return PowerUsageSummaryScreen.KEY;
    }
}