/*
 * 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.contacts.common.compat.telecom;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.support.annotation.Nullable;
import android.telecom.PhoneAccount;
import android.telecom.PhoneAccountHandle;
import android.telecom.TelecomManager;
import android.telephony.PhoneNumberUtils;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import com.android.dialer.compat.CompatUtils;
import java.util.ArrayList;
import java.util.List;

/** Compatibility class for {@link android.telecom.TelecomManager}. */
public class TelecomManagerCompat {

  public static final String TELECOM_MANAGER_CLASS = "android.telecom.TelecomManager";

  // TODO: remove once this is available in android.telecom.Call
  // b/33779976
  public static final String EXTRA_LAST_EMERGENCY_CALLBACK_TIME_MILLIS =
      "android.telecom.extra.LAST_EMERGENCY_CALLBACK_TIME_MILLIS";

  /**
   * Places a new outgoing call to the provided address using the system telecom service with the
   * specified intent.
   *
   * @param activity {@link Activity} used to start another activity for the given intent
   * @param telecomManager the {@link TelecomManager} used to place a call, if possible
   * @param intent the intent for the call
   */
  public static void placeCall(
      @Nullable Activity activity,
      @Nullable TelecomManager telecomManager,
      @Nullable Intent intent) {
    if (activity == null || telecomManager == null || intent == null) {
      return;
    }
    if (CompatUtils.isMarshmallowCompatible()) {
      telecomManager.placeCall(intent.getData(), intent.getExtras());
      return;
    }
    activity.startActivityForResult(intent, 0);
  }

  /**
   * Get the URI for running an adn query.
   *
   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
   * @param accountHandle The handle for the account to derive an adn query URI for or {@code null}
   *     to return a URI which will use the default account.
   * @return The URI (with the content:// scheme) specific to the specified {@link PhoneAccount} for
   *     the the content retrieve.
   */
  public static Uri getAdnUriForPhoneAccount(
      @Nullable TelecomManager telecomManager, PhoneAccountHandle accountHandle) {
    if (telecomManager != null
        && (CompatUtils.isMarshmallowCompatible()
            || CompatUtils.isMethodAvailable(
                TELECOM_MANAGER_CLASS, "getAdnUriForPhoneAccount", PhoneAccountHandle.class))) {
      return telecomManager.getAdnUriForPhoneAccount(accountHandle);
    }
    return Uri.parse("content://icc/adn");
  }

  /**
   * Returns a list of {@link PhoneAccountHandle}s which can be used to make and receive phone
   * calls. The returned list includes only those accounts which have been explicitly enabled by the
   * user.
   *
   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
   * @return A list of PhoneAccountHandle objects.
   */
  public static List<PhoneAccountHandle> getCallCapablePhoneAccounts(
      @Nullable TelecomManager telecomManager) {
    if (telecomManager != null
        && (CompatUtils.isMarshmallowCompatible()
            || CompatUtils.isMethodAvailable(
                TELECOM_MANAGER_CLASS, "getCallCapablePhoneAccounts"))) {
      return telecomManager.getCallCapablePhoneAccounts();
    }
    return new ArrayList<>();
  }

  /**
   * Used to determine the currently selected default dialer package.
   *
   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
   * @return package name for the default dialer package or null if no package has been selected as
   *     the default dialer.
   */
  @Nullable
  public static String getDefaultDialerPackage(@Nullable TelecomManager telecomManager) {
    if (telecomManager != null && CompatUtils.isDefaultDialerCompatible()) {
      return telecomManager.getDefaultDialerPackage();
    }
    return null;
  }

  /**
   * Return the {@link PhoneAccount} which will be used to place outgoing calls to addresses with
   * the specified {@code uriScheme}. This PhoneAccount will always be a member of the list which is
   * returned from invoking {@link TelecomManager#getCallCapablePhoneAccounts()}. The specific
   * account returned depends on the following priorities:
   *
   * <p>1. If the user-selected default PhoneAccount supports the specified scheme, it will be
   * returned. 2. If there exists only one PhoneAccount that supports the specified scheme, it will
   * be returned.
   *
   * <p>If no PhoneAccount fits the criteria above, this method will return {@code null}.
   *
   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
   * @param uriScheme The URI scheme.
   * @return The {@link PhoneAccountHandle} corresponding to the account to be used.
   */
  @Nullable
  public static PhoneAccountHandle getDefaultOutgoingPhoneAccount(
      @Nullable TelecomManager telecomManager, @Nullable String uriScheme) {
    if (telecomManager != null
        && (CompatUtils.isMarshmallowCompatible()
            || CompatUtils.isMethodAvailable(
                TELECOM_MANAGER_CLASS, "getDefaultOutgoingPhoneAccount", String.class))) {
      return telecomManager.getDefaultOutgoingPhoneAccount(uriScheme);
    }
    return null;
  }

  /**
   * Return the line 1 phone number for given phone account.
   *
   * @param telecomManager the {@link TelecomManager} to use in the event that {@link
   *     TelecomManager#getLine1Number(PhoneAccountHandle)} is available
   * @param telephonyManager the {@link TelephonyManager} to use if TelecomManager#getLine1Number is
   *     unavailable
   * @param phoneAccountHandle the phoneAccountHandle upon which to check the line one number
   * @return the line one number
   */
  @Nullable
  public static String getLine1Number(
      @Nullable TelecomManager telecomManager,
      @Nullable TelephonyManager telephonyManager,
      @Nullable PhoneAccountHandle phoneAccountHandle) {
    if (telecomManager != null && CompatUtils.isMarshmallowCompatible()) {
      return telecomManager.getLine1Number(phoneAccountHandle);
    }
    if (telephonyManager != null) {
      return telephonyManager.getLine1Number();
    }
    return null;
  }

  /**
   * Return whether a given phone number is the configured voicemail number for a particular phone
   * account.
   *
   * @param telecomManager the {@link TelecomManager} to use for checking the number.
   * @param accountHandle The handle for the account to check the voicemail number against
   * @param number The number to look up.
   */
  public static boolean isVoiceMailNumber(
      @Nullable TelecomManager telecomManager,
      @Nullable PhoneAccountHandle accountHandle,
      @Nullable String number) {
    if (telecomManager != null
        && (CompatUtils.isMarshmallowCompatible()
            || CompatUtils.isMethodAvailable(
                TELECOM_MANAGER_CLASS,
                "isVoiceMailNumber",
                PhoneAccountHandle.class,
                String.class))) {
      return telecomManager.isVoiceMailNumber(accountHandle, number);
    }
    return PhoneNumberUtils.isVoiceMailNumber(number);
  }

  /**
   * Return the {@link PhoneAccount} for a specified {@link PhoneAccountHandle}. Object includes
   * resources which can be used in a user interface.
   *
   * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
   * @param account The {@link PhoneAccountHandle}.
   * @return The {@link PhoneAccount} object or null if it doesn't exist.
   */
  @Nullable
  public static PhoneAccount getPhoneAccount(
      @Nullable TelecomManager telecomManager, @Nullable PhoneAccountHandle accountHandle) {
    if (telecomManager != null
        && (CompatUtils.isMethodAvailable(
            TELECOM_MANAGER_CLASS, "getPhoneAccount", PhoneAccountHandle.class))) {
      return telecomManager.getPhoneAccount(accountHandle);
    }
    return null;
  }

  /**
   * Return the voicemail number for a given phone account.
   *
   * @param telecomManager The {@link TelecomManager} object to use for retrieving the voicemail
   *     number if accountHandle is specified.
   * @param telephonyManager The {@link TelephonyManager} object to use for retrieving the voicemail
   *     number if accountHandle is null.
   * @param accountHandle The handle for the phone account.
   * @return The voicemail number for the phone account, and {@code null} if one has not been
   *     configured.
   */
  @Nullable
  public static String getVoiceMailNumber(
      @Nullable TelecomManager telecomManager,
      @Nullable TelephonyManager telephonyManager,
      @Nullable PhoneAccountHandle accountHandle) {
    if (telecomManager != null
        && (CompatUtils.isMethodAvailable(
            TELECOM_MANAGER_CLASS, "getVoiceMailNumber", PhoneAccountHandle.class))) {
      return telecomManager.getVoiceMailNumber(accountHandle);
    } else if (telephonyManager != null) {
      return telephonyManager.getVoiceMailNumber();
    }
    return null;
  }

  /**
   * Processes the specified dial string as an MMI code. MMI codes are any sequence of characters
   * entered into the dialpad that contain a "*" or "#". Some of these sequences launch special
   * behavior through handled by Telephony.
   *
   * @param telecomManager The {@link TelecomManager} object to use for handling MMI.
   * @param dialString The digits to dial.
   * @return {@code true} if the digits were processed as an MMI code, {@code false} otherwise.
   */
  public static boolean handleMmi(
      @Nullable TelecomManager telecomManager,
      @Nullable String dialString,
      @Nullable PhoneAccountHandle accountHandle) {
    if (telecomManager == null || TextUtils.isEmpty(dialString)) {
      return false;
    }
    if (CompatUtils.isMarshmallowCompatible()) {
      return telecomManager.handleMmi(dialString, accountHandle);
    }

    Object handleMmiResult =
        CompatUtils.invokeMethod(
            telecomManager,
            "handleMmi",
            new Class<?>[] {PhoneAccountHandle.class, String.class},
            new Object[] {accountHandle, dialString});
    if (handleMmiResult != null) {
      return (boolean) handleMmiResult;
    }

    return telecomManager.handleMmi(dialString);
  }

  /**
   * Silences the ringer if a ringing call exists. Noop if {@link TelecomManager#silenceRinger()} is
   * unavailable.
   *
   * @param telecomManager the TelecomManager to use to silence the ringer.
   */
  public static void silenceRinger(@Nullable TelecomManager telecomManager) {
    if (telecomManager != null
        && (CompatUtils.isMarshmallowCompatible()
            || CompatUtils.isMethodAvailable(TELECOM_MANAGER_CLASS, "silenceRinger"))) {
      telecomManager.silenceRinger();
    }
  }

  /**
   * Returns the current SIM call manager. Apps must be prepared for this method to return null,
   * indicating that there currently exists no registered SIM call manager.
   *
   * @param telecomManager the {@link TelecomManager} to use to fetch the SIM call manager.
   * @return The phone account handle of the current sim call manager.
   */
  @Nullable
  public static PhoneAccountHandle getSimCallManager(TelecomManager telecomManager) {
    if (telecomManager != null
        && (CompatUtils.isMarshmallowCompatible()
            || CompatUtils.isMethodAvailable(TELECOM_MANAGER_CLASS, "getSimCallManager"))) {
      return telecomManager.getSimCallManager();
    }
    return null;
  }
}