package com.blankj.utilcode.util;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.Point;
import android.os.Build;
import android.provider.Settings;
import android.support.annotation.ColorInt;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.annotation.RequiresPermission;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.util.TypedValue;
import android.view.Display;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.view.Window;
import android.view.WindowManager;

import java.lang.reflect.Method;

import static android.Manifest.permission.EXPAND_STATUS_BAR;

/**
 * <pre>
 *     author: Blankj
 *     blog  : http://blankj.com
 *     time  : 2016/09/23
 *     desc  : utils about bar
 * </pre>
 */
public final class BarUtils {

    ///////////////////////////////////////////////////////////////////////////
    // status bar
    ///////////////////////////////////////////////////////////////////////////

    private static final String TAG_STATUS_BAR = "TAG_STATUS_BAR";
    private static final String TAG_OFFSET     = "TAG_OFFSET";
    private static final int    KEY_OFFSET     = -123;

    private BarUtils() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    /**
     * Return the status bar's height.
     *
     * @return the status bar's height
     */
    public static int getStatusBarHeight() {
        Resources resources = Utils.getApp().getResources();
        int resourceId = resources.getIdentifier("status_bar_height", "dimen", "android");
        return resources.getDimensionPixelSize(resourceId);
    }

    /**
     * Set the status bar's visibility.
     *
     * @param activity  The activity.
     * @param isVisible True to set status bar visible, false otherwise.
     */
    public static void setStatusBarVisibility(@NonNull final Activity activity,
                                              final boolean isVisible) {
        setStatusBarVisibility(activity.getWindow(), isVisible);
    }

    /**
     * Set the status bar's visibility.
     *
     * @param window    The window.
     * @param isVisible True to set status bar visible, false otherwise.
     */
    public static void setStatusBarVisibility(@NonNull final Window window,
                                              final boolean isVisible) {
        if (isVisible) {
            window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            showStatusBarView(window);
            addMarginTopEqualStatusBarHeight(window);
        } else {
            window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            hideStatusBarView(window);
            subtractMarginTopEqualStatusBarHeight(window);
        }
    }

    /**
     * Return whether the status bar is visible.
     *
     * @param activity The activity.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isStatusBarVisible(@NonNull final Activity activity) {
        int flags = activity.getWindow().getAttributes().flags;
        return (flags & WindowManager.LayoutParams.FLAG_FULLSCREEN) == 0;
    }

    /**
     * Set the status bar's light mode.
     *
     * @param activity    The activity.
     * @param isLightMode True to set status bar light mode, false otherwise.
     */
    public static void setStatusBarLightMode(@NonNull final Activity activity,
                                             final boolean isLightMode) {
        setStatusBarLightMode(activity.getWindow(), isLightMode);
    }

    /**
     * Set the status bar's light mode.
     *
     * @param window      The window.
     * @param isLightMode True to set status bar light mode, false otherwise.
     */
    public static void setStatusBarLightMode(@NonNull final Window window,
                                             final boolean isLightMode) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            View decorView = window.getDecorView();
            int vis = decorView.getSystemUiVisibility();
            if (isLightMode) {
                vis |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
            } else {
                vis &= ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
            }
            decorView.setSystemUiVisibility(vis);
        }
    }

    /**
     * Is the status bar light mode.
     *
     * @param activity The activity.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isStatusBarLightMode(@NonNull final Activity activity) {
        return isStatusBarLightMode(activity.getWindow());
    }

    /**
     * Is the status bar light mode.
     *
     * @param window The window.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isStatusBarLightMode(@NonNull final Window window) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            View decorView = window.getDecorView();
            int vis = decorView.getSystemUiVisibility();
            return (vis & View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR) != 0;
        }
        return false;
    }

    /**
     * Add the top margin size equals status bar's height for view.
     *
     * @param view The view.
     */
    public static void addMarginTopEqualStatusBarHeight(@NonNull View view) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        view.setTag(TAG_OFFSET);
        Object haveSetOffset = view.getTag(KEY_OFFSET);
        if (haveSetOffset != null && (Boolean) haveSetOffset) return;
        MarginLayoutParams layoutParams = (MarginLayoutParams) view.getLayoutParams();
        layoutParams.setMargins(layoutParams.leftMargin,
                layoutParams.topMargin + getStatusBarHeight(),
                layoutParams.rightMargin,
                layoutParams.bottomMargin);
        view.setTag(KEY_OFFSET, true);
    }

    /**
     * Subtract the top margin size equals status bar's height for view.
     *
     * @param view The view.
     */
    public static void subtractMarginTopEqualStatusBarHeight(@NonNull View view) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        Object haveSetOffset = view.getTag(KEY_OFFSET);
        if (haveSetOffset == null || !(Boolean) haveSetOffset) return;
        MarginLayoutParams layoutParams = (MarginLayoutParams) view.getLayoutParams();
        layoutParams.setMargins(layoutParams.leftMargin,
                layoutParams.topMargin - getStatusBarHeight(),
                layoutParams.rightMargin,
                layoutParams.bottomMargin);
        view.setTag(KEY_OFFSET, false);
    }

    private static void addMarginTopEqualStatusBarHeight(@NonNull final Window window) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        View withTag = window.getDecorView().findViewWithTag(TAG_OFFSET);
        if (withTag == null) return;
        addMarginTopEqualStatusBarHeight(withTag);
    }

    private static void subtractMarginTopEqualStatusBarHeight(@NonNull final Window window) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        View withTag = window.getDecorView().findViewWithTag(TAG_OFFSET);
        if (withTag == null) return;
        subtractMarginTopEqualStatusBarHeight(withTag);
    }

    /**
     * Set the status bar's color.
     *
     * @param activity The activity.
     * @param color    The status bar's color.
     */
    public static View setStatusBarColor(@NonNull final Activity activity,
                                         @ColorInt final int color) {
        return setStatusBarColor(activity, color, false);
    }

    /**
     * Set the status bar's color.
     *
     * @param activity The activity.
     * @param color    The status bar's color.
     * @param isDecor  True to add fake status bar in DecorView,
     *                 false to add fake status bar in ContentView.
     */
    public static View setStatusBarColor(@NonNull final Activity activity,
                                         @ColorInt final int color,
                                         final boolean isDecor) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return null;
        transparentStatusBar(activity);
        return applyStatusBarColor(activity, color, isDecor);
    }


    /**
     * Set the status bar's color.
     *
     * @param window The window.
     * @param color  The status bar's color.
     */
    public static View setStatusBarColor(@NonNull final Window window,
                                         @ColorInt final int color) {
        return setStatusBarColor(window, color, false);
    }

    /**
     * Set the status bar's color.
     *
     * @param window  The window.
     * @param color   The status bar's color.
     * @param isDecor True to add fake status bar in DecorView,
     *                false to add fake status bar in ContentView.
     */
    public static View setStatusBarColor(@NonNull final Window window,
                                         @ColorInt final int color,
                                         final boolean isDecor) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return null;
        transparentStatusBar(window);
        return applyStatusBarColor(window, color, isDecor);
    }

    /**
     * Set the status bar's color.
     *
     * @param fakeStatusBar The fake status bar view.
     * @param color         The status bar's color.
     */
    public static void setStatusBarColor(@NonNull final View fakeStatusBar,
                                         @ColorInt final int color) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        Activity activity = UtilsBridge.getActivityByContext(fakeStatusBar.getContext());
        if (activity == null) return;
        transparentStatusBar(activity);
        fakeStatusBar.setVisibility(View.VISIBLE);
        ViewGroup.LayoutParams layoutParams = fakeStatusBar.getLayoutParams();
        layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
        layoutParams.height = getStatusBarHeight();
        fakeStatusBar.setBackgroundColor(color);
    }

    /**
     * Set the custom status bar.
     *
     * @param fakeStatusBar The fake status bar view.
     */
    public static void setStatusBarCustom(@NonNull final View fakeStatusBar) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        Activity activity = UtilsBridge.getActivityByContext(fakeStatusBar.getContext());
        if (activity == null) return;
        transparentStatusBar(activity);
        fakeStatusBar.setVisibility(View.VISIBLE);
        ViewGroup.LayoutParams layoutParams = fakeStatusBar.getLayoutParams();
        if (layoutParams == null) {
            layoutParams = new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    getStatusBarHeight()
            );
            fakeStatusBar.setLayoutParams(layoutParams);
        } else {
            layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
            layoutParams.height = getStatusBarHeight();
        }
    }

    /**
     * Set the status bar's color for DrawerLayout.
     * <p>DrawLayout must add {@code android:fitsSystemWindows="true"}</p>
     *
     * @param drawer        The DrawLayout.
     * @param fakeStatusBar The fake status bar view.
     * @param color         The status bar's color.
     */
    public static void setStatusBarColor4Drawer(@NonNull final DrawerLayout drawer,
                                                @NonNull final View fakeStatusBar,
                                                @ColorInt final int color) {
        setStatusBarColor4Drawer(drawer, fakeStatusBar, color, false);
    }

    /**
     * Set the status bar's color for DrawerLayout.
     * <p>DrawLayout must add {@code android:fitsSystemWindows="true"}</p>
     *
     * @param drawer        The DrawLayout.
     * @param fakeStatusBar The fake status bar view.
     * @param color         The status bar's color.
     * @param isTop         True to set DrawerLayout at the top layer, false otherwise.
     */
    public static void setStatusBarColor4Drawer(@NonNull final DrawerLayout drawer,
                                                @NonNull final View fakeStatusBar,
                                                @ColorInt final int color,
                                                final boolean isTop) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        Activity activity = UtilsBridge.getActivityByContext(fakeStatusBar.getContext());
        if (activity == null) return;
        transparentStatusBar(activity);
        drawer.setFitsSystemWindows(false);
        setStatusBarColor(fakeStatusBar, color);
        for (int i = 0, count = drawer.getChildCount(); i < count; i++) {
            drawer.getChildAt(i).setFitsSystemWindows(false);
        }
        if (isTop) {
            hideStatusBarView(activity);
        } else {
            setStatusBarColor(activity, color, false);
        }
    }

    private static View applyStatusBarColor(@NonNull final Activity activity,
                                            final int color,
                                            boolean isDecor) {
        return applyStatusBarColor(activity.getWindow(), color, isDecor);
    }

    private static View applyStatusBarColor(@NonNull final Window window,
                                            final int color,
                                            boolean isDecor) {
        ViewGroup parent = isDecor ?
                (ViewGroup) window.getDecorView() :
                (ViewGroup) window.findViewById(android.R.id.content);
        View fakeStatusBarView = parent.findViewWithTag(TAG_STATUS_BAR);
        if (fakeStatusBarView != null) {
            if (fakeStatusBarView.getVisibility() == View.GONE) {
                fakeStatusBarView.setVisibility(View.VISIBLE);
            }
            fakeStatusBarView.setBackgroundColor(color);
        } else {
            fakeStatusBarView = createStatusBarView(window.getContext(), color);
            parent.addView(fakeStatusBarView);
        }
        return fakeStatusBarView;
    }

    private static void hideStatusBarView(@NonNull final Activity activity) {
        hideStatusBarView(activity.getWindow());
    }

    private static void hideStatusBarView(@NonNull final Window window) {
        ViewGroup decorView = (ViewGroup) window.getDecorView();
        View fakeStatusBarView = decorView.findViewWithTag(TAG_STATUS_BAR);
        if (fakeStatusBarView == null) return;
        fakeStatusBarView.setVisibility(View.GONE);
    }

    private static void showStatusBarView(@NonNull final Window window) {
        ViewGroup decorView = (ViewGroup) window.getDecorView();
        View fakeStatusBarView = decorView.findViewWithTag(TAG_STATUS_BAR);
        if (fakeStatusBarView == null) return;
        fakeStatusBarView.setVisibility(View.VISIBLE);
    }

    private static View createStatusBarView(@NonNull final Context context,
                                            final int color) {
        View statusBarView = new View(context);
        statusBarView.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, getStatusBarHeight()));
        statusBarView.setBackgroundColor(color);
        statusBarView.setTag(TAG_STATUS_BAR);
        return statusBarView;
    }

    public static void transparentStatusBar(@NonNull final Activity activity) {
        transparentStatusBar(activity.getWindow());
    }

    public static void transparentStatusBar(@NonNull final Window window) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            int option = View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
            int vis = window.getDecorView().getSystemUiVisibility();
            window.getDecorView().setSystemUiVisibility(option | vis);
            window.setStatusBarColor(Color.TRANSPARENT);
        } else {
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

    ///////////////////////////////////////////////////////////////////////////
    // action bar
    ///////////////////////////////////////////////////////////////////////////

    /**
     * Return the action bar's height.
     *
     * @return the action bar's height
     */
    public static int getActionBarHeight() {
        TypedValue tv = new TypedValue();
        if (Utils.getApp().getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
            return TypedValue.complexToDimensionPixelSize(
                    tv.data, Utils.getApp().getResources().getDisplayMetrics()
            );
        }
        return 0;
    }

    ///////////////////////////////////////////////////////////////////////////
    // notification bar
    ///////////////////////////////////////////////////////////////////////////

    /**
     * Set the notification bar's visibility.
     * <p>Must hold {@code <uses-permission android:name="android.permission.EXPAND_STATUS_BAR" />}</p>
     *
     * @param isVisible True to set notification bar visible, false otherwise.
     */
    @RequiresPermission(EXPAND_STATUS_BAR)
    public static void setNotificationBarVisibility(final boolean isVisible) {
        String methodName;
        if (isVisible) {
            methodName = (Build.VERSION.SDK_INT <= 16) ? "expand" : "expandNotificationsPanel";
        } else {
            methodName = (Build.VERSION.SDK_INT <= 16) ? "collapse" : "collapsePanels";
        }
        invokePanels(methodName);
    }

    private static void invokePanels(final String methodName) {
        try {
            @SuppressLint("WrongConstant")
            Object service = Utils.getApp().getSystemService("statusbar");
            @SuppressLint("PrivateApi")
            Class<?> statusBarManager = Class.forName("android.app.StatusBarManager");
            Method expand = statusBarManager.getMethod(methodName);
            expand.invoke(service);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    ///////////////////////////////////////////////////////////////////////////
    // navigation bar
    ///////////////////////////////////////////////////////////////////////////

    /**
     * Return the navigation bar's height.
     *
     * @return the navigation bar's height
     */
    public static int getNavBarHeight() {
        Resources res = Utils.getApp().getResources();
        int resourceId = res.getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId != 0) {
            return res.getDimensionPixelSize(resourceId);
        } else {
            return 0;
        }
    }

    /**
     * Set the navigation bar's visibility.
     *
     * @param activity  The activity.
     * @param isVisible True to set navigation bar visible, false otherwise.
     */
    public static void setNavBarVisibility(@NonNull final Activity activity, boolean isVisible) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        setNavBarVisibility(activity.getWindow(), isVisible);

    }

    /**
     * Set the navigation bar's visibility.
     *
     * @param window    The window.
     * @param isVisible True to set navigation bar visible, false otherwise.
     */
    public static void setNavBarVisibility(@NonNull final Window window, boolean isVisible) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) return;
        final ViewGroup decorView = (ViewGroup) window.getDecorView();
        for (int i = 0, count = decorView.getChildCount(); i < count; i++) {
            final View child = decorView.getChildAt(i);
            final int id = child.getId();
            if (id != View.NO_ID) {
                String resourceEntryName = getResNameById(id);
                if ("navigationBarBackground".equals(resourceEntryName)) {
                    child.setVisibility(isVisible ? View.VISIBLE : View.INVISIBLE);
                }
            }
        }
        final int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        if (isVisible) {
            decorView.setSystemUiVisibility(decorView.getSystemUiVisibility() & ~uiOptions);
        } else {
            decorView.setSystemUiVisibility(decorView.getSystemUiVisibility() | uiOptions);
        }
    }

    /**
     * Return whether the navigation bar visible.
     * <p>Call it in onWindowFocusChanged will get right result.</p>
     *
     * @param activity The activity.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isNavBarVisible(@NonNull final Activity activity) {
        return isNavBarVisible(activity.getWindow());
    }

    /**
     * Return whether the navigation bar visible.
     * <p>Call it in onWindowFocusChanged will get right result.</p>
     *
     * @param window The window.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isNavBarVisible(@NonNull final Window window) {
        boolean isVisible = false;
        ViewGroup decorView = (ViewGroup) window.getDecorView();
        for (int i = 0, count = decorView.getChildCount(); i < count; i++) {
            final View child = decorView.getChildAt(i);
            final int id = child.getId();
            if (id != View.NO_ID) {
                String resourceEntryName = getResNameById(id);
                if ("navigationBarBackground".equals(resourceEntryName)
                        && child.getVisibility() == View.VISIBLE) {
                    isVisible = true;
                    break;
                }
            }
        }
        if (isVisible) {
            // 对于三星手机，android10以下非OneUI2的版本，比如 s8，note8 等设备上，
            // 导航栏显示存在bug："当用户隐藏导航栏时显示输入法的时候导航栏会跟随显示"，会导致隐藏输入法之后判断错误
            // 这个问题在 OneUI 2 & android 10 版本已修复
            if (UtilsBridge.isSamsung()
                    && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1
                    && Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
                try {
                    return Settings.Global.getInt(Utils.getApp().getContentResolver(), "navigationbar_hide_bar_enabled") == 0;
                } catch (Exception ignore) {
                }
            }

            int visibility = decorView.getSystemUiVisibility();
            isVisible = (visibility & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0;
        }

        return isVisible;
    }

    private static String getResNameById(int id) {
        try {
            return Utils.getApp().getResources().getResourceEntryName(id);
        } catch (Exception ignore) {
            return "";
        }
    }

    /**
     * Set the navigation bar's color.
     *
     * @param activity The activity.
     * @param color    The navigation bar's color.
     */
    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
    public static void setNavBarColor(@NonNull final Activity activity, @ColorInt final int color) {
        setNavBarColor(activity.getWindow(), color);
    }

    /**
     * Set the navigation bar's color.
     *
     * @param window The window.
     * @param color  The navigation bar's color.
     */
    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
    public static void setNavBarColor(@NonNull final Window window, @ColorInt final int color) {
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.setNavigationBarColor(color);
    }

    /**
     * Return the color of navigation bar.
     *
     * @param activity The activity.
     * @return the color of navigation bar
     */
    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
    public static int getNavBarColor(@NonNull final Activity activity) {
        return getNavBarColor(activity.getWindow());
    }

    /**
     * Return the color of navigation bar.
     *
     * @param window The window.
     * @return the color of navigation bar
     */
    @RequiresApi(Build.VERSION_CODES.LOLLIPOP)
    public static int getNavBarColor(@NonNull final Window window) {
        return window.getNavigationBarColor();
    }

    /**
     * Return whether the navigation bar visible.
     *
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isSupportNavBar() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            WindowManager wm = (WindowManager) Utils.getApp().getSystemService(Context.WINDOW_SERVICE);
            if (wm == null) return false;
            Display display = wm.getDefaultDisplay();
            Point size = new Point();
            Point realSize = new Point();
            display.getSize(size);
            display.getRealSize(realSize);
            return realSize.y != size.y || realSize.x != size.x;
        }
        boolean menu = ViewConfiguration.get(Utils.getApp()).hasPermanentMenuKey();
        boolean back = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
        return !menu && !back;
    }

    /**
     * Set the nav bar's light mode.
     *
     * @param activity    The activity.
     * @param isLightMode True to set nav bar light mode, false otherwise.
     */
    public static void setNavBarLightMode(@NonNull final Activity activity,
                                          final boolean isLightMode) {
        setNavBarLightMode(activity.getWindow(), isLightMode);
    }

    /**
     * Set the nav bar's light mode.
     *
     * @param window      The window.
     * @param isLightMode True to set nav bar light mode, false otherwise.
     */
    public static void setNavBarLightMode(@NonNull final Window window,
                                          final boolean isLightMode) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            View decorView = window.getDecorView();
            int vis = decorView.getSystemUiVisibility();
            if (isLightMode) {
                vis |= View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR;
            } else {
                vis &= ~View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR;
            }
            decorView.setSystemUiVisibility(vis);
        }
    }

    /**
     * Is the nav bar light mode.
     *
     * @param activity The activity.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isNavBarLightMode(@NonNull final Activity activity) {
        return isNavBarLightMode(activity.getWindow());
    }

    /**
     * Is the nav bar light mode.
     *
     * @param window The window.
     * @return {@code true}: yes<br>{@code false}: no
     */
    public static boolean isNavBarLightMode(@NonNull final Window window) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            View decorView = window.getDecorView();
            int vis = decorView.getSystemUiVisibility();
            return (vis & View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR) != 0;
        }
        return false;
    }
}
