content: /*
   * 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.internal.util;
  
  import android.app.Notification;
  import android.app.NotificationManager;
  import android.content.Context;
  import android.database.ContentObserver;
  import android.net.Uri;
  import android.os.Handler;
  import android.os.Looper;
  import android.os.UserHandle;
  import android.provider.Settings;
  import android.service.notification.StatusBarNotification;
  import android.util.ArrayMap;
  
  import java.util.Objects;
  
  /**
   * A util to look up messaging related functions for notifications. This is used for both the
   * ranking and the actual layout.
   */
  public class NotificationMessagingUtil {
  
      private static final String DEFAULT_SMS_APP_SETTING = Settings.Secure.SMS_DEFAULT_APPLICATION;
      private final Context mContext;
      private ArrayMap<Integer, String> mDefaultSmsApp = new ArrayMap<>();
  
      public NotificationMessagingUtil(Context context) {
          mContext = context;
          mContext.getContentResolver().registerContentObserver(
                  Settings.Secure.getUriFor(DEFAULT_SMS_APP_SETTING), false, mSmsContentObserver);
      }
  
      public boolean isImportantMessaging(StatusBarNotification sbn, int importance) {
          if (importance < NotificationManager.IMPORTANCE_LOW) {
              return false;
          }
  
          return hasMessagingStyle(sbn) || (isCategoryMessage(sbn) && isDefaultMessagingApp(sbn));
      }
  
      public boolean isMessaging(StatusBarNotification sbn) {
          return hasMessagingStyle(sbn) || isDefaultMessagingApp(sbn) || isCategoryMessage(sbn);
      }
  
      @SuppressWarnings("deprecation")
      private boolean isDefaultMessagingApp(StatusBarNotification sbn) {
          final int userId = sbn.getUserId();
          if (userId == UserHandle.USER_NULL || userId == UserHandle.USER_ALL) return false;
          if (mDefaultSmsApp.get(userId) == null) {
              cacheDefaultSmsApp(userId);
          }
          return Objects.equals(mDefaultSmsApp.get(userId), sbn.getPackageName());
      }
  
      private void cacheDefaultSmsApp(int userId) {
          mDefaultSmsApp.put(userId, Settings.Secure.getStringForUser(
                  mContext.getContentResolver(),
                  Settings.Secure.SMS_DEFAULT_APPLICATION, userId));
      }
  
      private final ContentObserver mSmsContentObserver = new ContentObserver(
              new Handler(Looper.getMainLooper())) {
          @Override
          public void onChange(boolean selfChange, Uri uri, int userId) {
              if (Settings.Secure.getUriFor(DEFAULT_SMS_APP_SETTING).equals(uri)) {
                  cacheDefaultSmsApp(userId);
              }
          }
      };
  
      private boolean hasMessagingStyle(StatusBarNotification sbn) {
          Class<? extends Notification.Style> style = sbn.getNotification().getNotificationStyle();
          return Notification.MessagingStyle.class.equals(style);
      }
  
      private boolean isCategoryMessage(StatusBarNotification sbn) {
          return Notification.CATEGORY_MESSAGE.equals(sbn.getNotification().category);
      }
  }
  