/*
 * 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.dialer.app.voicemail;

import android.annotation.TargetApi;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build.VERSION_CODES;
import android.preference.PreferenceManager;
import android.support.v4.os.BuildCompat;
import android.support.v4.os.UserManagerCompat;
import android.telecom.PhoneAccountHandle;
import android.telephony.TelephonyManager;
import com.android.dialer.app.calllog.LegacyVoicemailNotifier;
import com.android.dialer.common.Assert;
import com.android.dialer.common.LogUtil;
import com.android.dialer.common.PerAccountSharedPreferences;
import com.android.voicemail.VoicemailComponent;

/**
 * Receives {@link TelephonyManager#ACTION_SHOW_VOICEMAIL_NOTIFICATION}, and forwards to {@link
 * LegacyVoicemailNotifier}. Will ignore the notification if the account has visual voicemail.
 * Legacy voicemail is the traditional, non-visual, dial-in voicemail.
 */
@TargetApi(VERSION_CODES.O)
public class LegacyVoicemailNotificationReceiver extends BroadcastReceiver {

  private static final String LEGACY_VOICEMAIL_COUNT = "legacy_voicemail_count";

  /**
   * Hidden extra for {@link TelephonyManager#ACTION_SHOW_VOICEMAIL_NOTIFICATION} for whether the
   * notification is just a refresh or for a new voicemail. The phone should not play a ringtone or
   * vibrate during a refresh if the notification is already showing.
   *
   * <p>TODO(b/62202833): make public
   */
  private static final String EXTRA_IS_REFRESH = "is_refresh";

  @Override
  public void onReceive(Context context, Intent intent) {
    LogUtil.i(
        "LegacyVoicemailNotificationReceiver.onReceive", "received legacy voicemail notification");
    Assert.checkArgument(BuildCompat.isAtLeastO());

    PhoneAccountHandle phoneAccountHandle =
        Assert.isNotNull(intent.getParcelableExtra(TelephonyManager.EXTRA_PHONE_ACCOUNT_HANDLE));
    int count = intent.getIntExtra(TelephonyManager.EXTRA_NOTIFICATION_COUNT, -1);

    if (!hasVoicemailCountChanged(context, phoneAccountHandle, count)) {
      LogUtil.i(
          "LegacyVoicemailNotificationReceiver.onReceive",
          "voicemail count hasn't changed, ignoring");
      return;
    }

    if (count == -1) {
      // Carrier might not send voicemail count. Missing extra means there are unknown numbers of
      // voicemails (One or more). Treat it as 1 so the generic version will be shown. ("Voicemail"
      // instead of "X voicemails")
      count = 1;
    }

    if (count == 0) {
      LogUtil.i("LegacyVoicemailNotificationReceiver.onReceive", "clearing notification");
      LegacyVoicemailNotifier.cancelNotification(context);
      return;
    }

    if (VoicemailComponent.get(context)
        .getVoicemailClient()
        .isActivated(context, phoneAccountHandle)) {
      LogUtil.i(
          "LegacyVoicemailNotificationReceiver.onReceive",
          "visual voicemail is activated, ignoring notification");
      return;
    }

    String voicemailNumber = intent.getStringExtra(TelephonyManager.EXTRA_VOICEMAIL_NUMBER);
    PendingIntent callVoicemailIntent =
        intent.getParcelableExtra(TelephonyManager.EXTRA_CALL_VOICEMAIL_INTENT);
    PendingIntent voicemailSettingIntent =
        intent.getParcelableExtra(TelephonyManager.EXTRA_LAUNCH_VOICEMAIL_SETTINGS_INTENT);

    LogUtil.i("LegacyVoicemailNotificationReceiver.onReceive", "sending notification");
    LegacyVoicemailNotifier.showNotification(
        context,
        phoneAccountHandle,
        count,
        voicemailNumber,
        callVoicemailIntent,
        voicemailSettingIntent,
        intent.getBooleanExtra(EXTRA_IS_REFRESH, false));
  }

  private static boolean hasVoicemailCountChanged(
      Context context, PhoneAccountHandle phoneAccountHandle, int newCount) {
    // Need credential encrypted storage to access preferences.
    if (!UserManagerCompat.isUserUnlocked(context)) {
      LogUtil.i(
          "LegacyVoicemailNotificationReceiver.onReceive",
          "User locked, bypassing voicemail count check");
      return true;
    }

    if (newCount == -1) {
      // Carrier does not report voicemail count
      return true;
    }

    PerAccountSharedPreferences preferences =
        new PerAccountSharedPreferences(
            context, phoneAccountHandle, PreferenceManager.getDefaultSharedPreferences(context));
    // Carriers may send multiple notifications for the same voicemail.
    if (newCount != 0 && newCount == preferences.getInt(LEGACY_VOICEMAIL_COUNT, -1)) {
      return false;
    }
    preferences.edit().putInt(LEGACY_VOICEMAIL_COUNT, newCount).apply();
    return true;
  }
}