/*
 * Copyright (C) 2015 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.systemui.qs.tiles;

import android.content.Intent;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.provider.Settings.Secure;
import android.service.quicksettings.Tile;
import android.view.View;
import android.widget.Switch;

import androidx.annotation.Nullable;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.systemui.dagger.qualifiers.Background;
import com.android.systemui.dagger.qualifiers.Main;
import com.android.systemui.plugins.ActivityStarter;
import com.android.systemui.plugins.FalsingManager;
import com.android.systemui.plugins.qs.QSTile.BooleanState;
import com.android.systemui.plugins.statusbar.StatusBarStateController;
import com.android.systemui.qs.QSHost;
import com.android.systemui.qs.QsEventLogger;
import com.android.systemui.qs.UserSettingObserver;
import com.android.systemui.qs.logging.QSLogger;
import com.android.systemui.qs.tileimpl.QSTileImpl;
import com.android.systemui.res.R;
import com.android.systemui.statusbar.policy.BatteryController;
import com.android.systemui.util.settings.SecureSettings;

import javax.inject.Inject;

public class BatterySaverTile extends QSTileImpl<BooleanState> implements
        BatteryController.BatteryStateChangeCallback {

    public static final String TILE_SPEC = "battery";

    private final BatteryController mBatteryController;
    @VisibleForTesting
    protected final UserSettingObserver mSetting;

    private int mLevel;
    private boolean mPowerSave;
    private boolean mCharging;
    private boolean mPluggedIn;

    @Inject
    public BatterySaverTile(
            QSHost host,
            QsEventLogger uiEventLogger,
            @Background Looper backgroundLooper,
            @Main Handler mainHandler,
            FalsingManager falsingManager,
            MetricsLogger metricsLogger,
            StatusBarStateController statusBarStateController,
            ActivityStarter activityStarter,
            QSLogger qsLogger,
            BatteryController batteryController,
            SecureSettings secureSettings
    ) {
        super(host, uiEventLogger, backgroundLooper, mainHandler, falsingManager, metricsLogger,
                statusBarStateController, activityStarter, qsLogger);
        mBatteryController = batteryController;
        mBatteryController.observe(getLifecycle(), this);
        int currentUser = host.getUserContext().getUserId();
        mSetting = new UserSettingObserver(
                secureSettings,
                mHandler,
                Secure.LOW_POWER_WARNING_ACKNOWLEDGED,
                currentUser
        ) {
            @Override
            protected void handleValueChanged(int value, boolean observedChange) {
                // mHandler is the background handler so calling this is OK
                handleRefreshState(null);
            }
        };
    }

    @Override
    public BooleanState newTileState() {
        return new BooleanState();
    }

    @Override
    protected void handleDestroy() {
        super.handleDestroy();
        mSetting.setListening(false);
    }

    @Override
    protected void handleUserSwitch(int newUserId) {
        mSetting.setUserId(newUserId);
    }

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

    @Override
    public void handleSetListening(boolean listening) {
        super.handleSetListening(listening);
        mSetting.setListening(listening);
        if (!listening) {
            // If we stopped listening, it means that the tile is not visible. In that case, we
            // don't need to save the view anymore
            mBatteryController.clearLastPowerSaverStartView();
        }
    }

    @Override
    public Intent getLongClickIntent() {
        return new Intent(Settings.ACTION_BATTERY_SAVER_SETTINGS);
    }

    @Override
    protected void handleClick(@Nullable View view) {
        if (getState().state == Tile.STATE_UNAVAILABLE) {
            return;
        }
        mBatteryController.setPowerSaveMode(!mPowerSave, view);
    }

    @Override
    public CharSequence getTileLabel() {
        return mContext.getString(R.string.battery_detail_switch_title);
    }

    @Override
    protected void handleUpdateState(BooleanState state, Object arg) {
        state.state = mPluggedIn ? Tile.STATE_UNAVAILABLE
                : mPowerSave ? Tile.STATE_ACTIVE : Tile.STATE_INACTIVE;
        state.icon = ResourceIcon.get(mPowerSave
                ? R.drawable.qs_battery_saver_icon_on
                : R.drawable.qs_battery_saver_icon_off);
        state.label = mContext.getString(R.string.battery_detail_switch_title);
        state.secondaryLabel = "";
        state.contentDescription = state.label;
        state.value = mPowerSave;
        state.expandedAccessibilityClassName = Switch.class.getName();
    }

    @Override
    public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {
        mLevel = level;
        mPluggedIn = pluggedIn;
        mCharging = charging;
        refreshState(level);
    }

    @Override
    public void onPowerSaveChanged(boolean isPowerSave) {
        mPowerSave = isPowerSave;
        refreshState(null);
    }
}
