/*
 * 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.detectors;

import android.content.Context;
import android.os.PowerManager;

import com.android.settings.fuelgauge.BatteryInfo;
import com.android.settings.fuelgauge.batterytip.BatteryTipPolicy;
import com.android.settings.fuelgauge.batterytip.tips.BatteryTip;
import com.android.settings.fuelgauge.batterytip.tips.LowBatteryTip;

/** Detect whether the battery is too low */
public class LowBatteryDetector implements BatteryTipDetector {
    private final BatteryInfo mBatteryInfo;
    private final BatteryTipPolicy mBatteryTipPolicy;
    private final boolean mIsPowerSaveMode;
    private final int mWarningLevel;

    public LowBatteryDetector(
            Context context, BatteryTipPolicy batteryTipPolicy, BatteryInfo batteryInfo) {
        mBatteryTipPolicy = batteryTipPolicy;
        mBatteryInfo = batteryInfo;
        mWarningLevel =
                context.getResources()
                        .getInteger(com.android.internal.R.integer.config_lowBatteryWarningLevel);
        mIsPowerSaveMode = context.getSystemService(PowerManager.class).isPowerSaveMode();
    }

    @Override
    public BatteryTip detect() {
        final boolean lowBattery = mBatteryInfo.batteryLevel <= mWarningLevel;
        final boolean lowBatteryEnabled = mBatteryTipPolicy.lowBatteryEnabled && !mIsPowerSaveMode;
        final boolean dischargingLowBatteryState =
                mBatteryTipPolicy.testLowBatteryTip || (mBatteryInfo.discharging && lowBattery);

        // Show it as new if in test or in discharging low battery state,
        // dismiss it if battery saver is on or disabled by config.
        final int state =
                lowBatteryEnabled && dischargingLowBatteryState
                        ? BatteryTip.StateType.NEW
                        : BatteryTip.StateType.INVISIBLE;

        return new LowBatteryTip(state, mIsPowerSaveMode);
    }
}