/*
 * 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.settings.fuelgauge.batterytip;

import android.content.Context;
import android.os.BatteryUsageStats;

import androidx.annotation.VisibleForTesting;

import com.android.settings.fuelgauge.BatteryInfo;
import com.android.settings.fuelgauge.BatteryUtils;
import com.android.settings.fuelgauge.batterytip.detectors.BatteryDefenderDetector;
import com.android.settings.fuelgauge.batterytip.detectors.HighUsageDetector;
import com.android.settings.fuelgauge.batterytip.detectors.IncompatibleChargerDetector;
import com.android.settings.fuelgauge.batterytip.tips.BatteryTip;
import com.android.settings.overlay.FeatureFactory;
import com.android.settingslib.utils.AsyncLoaderCompat;

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

/**
 * Loader to compute and return a battery tip list. It will always return a full length list even
 * though some tips may have state {@code BaseBatteryTip.StateType.INVISIBLE}.
 */
public class BatteryTipLoader extends AsyncLoaderCompat<List<BatteryTip>> {
    private static final String TAG = "BatteryTipLoader";

    private BatteryUsageStats mBatteryUsageStats;

    @VisibleForTesting BatteryUtils mBatteryUtils;

    public BatteryTipLoader(Context context, BatteryUsageStats batteryUsageStats) {
        super(context);
        mBatteryUsageStats = batteryUsageStats;
        mBatteryUtils = BatteryUtils.getInstance(context);
    }

    @Override
    public List<BatteryTip> loadInBackground() {
        final List<BatteryTip> tips = new ArrayList<>();
        final BatteryTipPolicy batteryTipPolicy = new BatteryTipPolicy(getContext());
        final BatteryInfo batteryInfo = mBatteryUtils.getBatteryInfo(TAG);
        final Context context = getContext().getApplicationContext();

        tips.add(
                new HighUsageDetector(context, batteryTipPolicy, mBatteryUsageStats, batteryInfo)
                        .detect());
        tips.add(new BatteryDefenderDetector(batteryInfo, context).detect());
        tips.add(new IncompatibleChargerDetector(context).detect());
        FeatureFactory.getFeatureFactory()
                .getBatterySettingsFeatureProvider()
                .addBatteryTipDetector(context, tips, batteryInfo, batteryTipPolicy);
        Collections.sort(tips);
        return tips;
    }

    @Override
    protected void onDiscardResult(List<BatteryTip> result) {}
}