/*
 * Copyright (C) 2014 The CyanogenMod 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;

import com.android.systemui.statusbar.policy.BatteryController;
import com.android.systemui.statusbar.policy.BatteryStateRegistar;

import android.content.Context;
import android.content.res.Configuration;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;

import java.text.NumberFormat;

public class BatteryLevelTextView extends TextView implements
        BatteryController.BatteryStateChangeCallback{

    private BatteryStateRegistar mBatteryStateRegistar;
    private boolean mBatteryPresent;

    private boolean mBatteryCharging;
    private boolean mForceShow;
    private boolean mAttached;
    private int mRequestedVisibility;
    private int mStyle;
    private int mPercentMode;

    public BatteryLevelTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // setBatteryStateRegistar (if called) will made the view visible and ready to be hidden
        // if the view shouldn't be displayed. Otherwise this view should be hidden from start.
        mRequestedVisibility = GONE;
    }

    public void setForceShown(boolean forceShow) {
        mForceShow = forceShow;
        updateVisibility();
    }

    public void setBatteryStateRegistar(BatteryStateRegistar batteryStateRegistar) {
        mRequestedVisibility = VISIBLE;
        mBatteryStateRegistar = batteryStateRegistar;
        if (mAttached) {
            mBatteryStateRegistar.addStateChangedCallback(this);
        }
    }

    @Override
    public void setVisibility(int visibility) {
        mRequestedVisibility = visibility;
        updateVisibility();
    }

    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        // Respect font size setting.
        setTextSize(TypedValue.COMPLEX_UNIT_PX,
                getResources().getDimensionPixelSize(R.dimen.battery_level_text_size));
    }

    @Override
    public void onBatteryLevelChanged(boolean present, int level, boolean pluggedIn,
            boolean charging) {
        String percentage = NumberFormat.getPercentInstance().format((double) level / 100.0);
        setText(percentage);
        if (mBatteryPresent != present || mBatteryCharging != charging) {
            mBatteryPresent = present;
            mBatteryCharging = charging;
            updateVisibility();
        }
    }

    @Override
    public void onPowerSaveChanged() {
        // Not used
    }

    @Override
    public void onBatteryStyleChanged(int style, int percentMode) {
        mStyle = style;
        mPercentMode = percentMode;
        updateVisibility();
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();

        if (mBatteryStateRegistar != null) {
            mBatteryStateRegistar.addStateChangedCallback(this);
        }

        mAttached = true;
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mAttached = false;

        if (mBatteryStateRegistar != null) {
            mBatteryStateRegistar.removeStateChangedCallback(this);
        }
    }

    private void updateVisibility() {
        boolean showNextPercent = mBatteryPresent && (
                mPercentMode == BatteryController.PERCENTAGE_MODE_OUTSIDE
                || (mBatteryCharging && mPercentMode == BatteryController.PERCENTAGE_MODE_INSIDE));
        if (mStyle == BatteryController.STYLE_GONE) {
            showNextPercent = false;
        } else if (mStyle == BatteryController.STYLE_TEXT) {
            showNextPercent = true;
        }

        if (mBatteryStateRegistar != null && (showNextPercent || mForceShow)) {
            super.setVisibility(mRequestedVisibility);
        } else {
            super.setVisibility(GONE);
        }
    }
}