/*
 * Copyright (C) 2013 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.calllogutils;

import android.content.ComponentName;
import android.content.Context;
import android.support.annotation.Nullable;
import android.telecom.PhoneAccount;
import android.telecom.PhoneAccountHandle;
import android.text.TextUtils;
import com.android.dialer.telecom.TelecomUtil;
import java.util.ArrayList;
import java.util.List;

/** Methods to help extract {@code PhoneAccount} information from database and Telecomm sources. */
public class PhoneAccountUtils {

  /** Return a list of phone accounts that are subscription/SIM accounts. */
  public static List<PhoneAccountHandle> getSubscriptionPhoneAccounts(Context context) {
    List<PhoneAccountHandle> subscriptionAccountHandles = new ArrayList<PhoneAccountHandle>();
    final List<PhoneAccountHandle> accountHandles =
        TelecomUtil.getCallCapablePhoneAccounts(context);
    for (PhoneAccountHandle accountHandle : accountHandles) {
      PhoneAccount account = TelecomUtil.getPhoneAccount(context, accountHandle);
      if (account.hasCapabilities(PhoneAccount.CAPABILITY_SIM_SUBSCRIPTION)) {
        subscriptionAccountHandles.add(accountHandle);
      }
    }
    return subscriptionAccountHandles;
  }

  /** Compose PhoneAccount object from component name and account id. */
  @Nullable
  public static PhoneAccountHandle getAccount(
      @Nullable String componentString, @Nullable String accountId) {
    if (TextUtils.isEmpty(componentString) || TextUtils.isEmpty(accountId)) {
      return null;
    }
    final ComponentName componentName = ComponentName.unflattenFromString(componentString);
    if (componentName == null) {
      return null;
    }
    return new PhoneAccountHandle(componentName, accountId);
  }

  /** Extract account label from PhoneAccount object. */
  @Nullable
  public static String getAccountLabel(
      Context context, @Nullable PhoneAccountHandle accountHandle) {
    PhoneAccount account = getAccountOrNull(context, accountHandle);
    if (account != null && account.getLabel() != null) {
      return account.getLabel().toString();
    }
    return null;
  }

  /** Extract account color from PhoneAccount object. */
  public static int getAccountColor(Context context, @Nullable PhoneAccountHandle accountHandle) {
    final PhoneAccount account = TelecomUtil.getPhoneAccount(context, accountHandle);

    // For single-sim devices the PhoneAccount will be NO_HIGHLIGHT_COLOR by default, so it is
    // safe to always use the account highlight color.
    return account == null ? PhoneAccount.NO_HIGHLIGHT_COLOR : account.getHighlightColor();
  }

  /**
   * Determine whether a phone account supports call subjects.
   *
   * @return {@code true} if call subjects are supported, {@code false} otherwise.
   */
  public static boolean getAccountSupportsCallSubject(
      Context context, @Nullable PhoneAccountHandle accountHandle) {
    final PhoneAccount account = TelecomUtil.getPhoneAccount(context, accountHandle);

    return account != null && account.hasCapabilities(PhoneAccount.CAPABILITY_CALL_SUBJECT);
  }

  /**
   * Retrieve the account metadata, but if the account does not exist or the device has only a
   * single registered and enabled account, return null.
   */
  @Nullable
  private static PhoneAccount getAccountOrNull(
      Context context, @Nullable PhoneAccountHandle accountHandle) {
    if (TelecomUtil.getCallCapablePhoneAccounts(context).size() <= 1) {
      return null;
    }
    return TelecomUtil.getPhoneAccount(context, accountHandle);
  }
}