/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package com.splunkotelreactnative.exporter.network;

import android.os.Build;
import android.telephony.TelephonyManager;
import androidx.annotation.RequiresApi;

@RequiresApi(api = Build.VERSION_CODES.P)
class CarrierFinder {

  private final TelephonyManager telephonyManager;

  CarrierFinder(TelephonyManager telephonyManager) {
    this.telephonyManager = telephonyManager;
  }

  Carrier get() {
    Carrier.Builder builder = Carrier.builder();
    int id = telephonyManager.getSimCarrierId();
    builder.id(id);
    CharSequence name = telephonyManager.getSimCarrierIdName();
    if (validString(name)) {
      builder.name(name.toString());
    }
    String simOperator = telephonyManager.getSimOperator();
    if (validString(simOperator) && simOperator.length() >= 5) {
      String countryCode = simOperator.substring(0, 3);
      String networkCode = simOperator.substring(3);
      builder.mobileCountryCode(countryCode).mobileNetworkCode(networkCode);
    }
    String isoCountryCode = telephonyManager.getSimCountryIso();
    if (validString(isoCountryCode)) {
      builder.isoCountryCode(isoCountryCode);
    }
    return builder.build();
  }

  private boolean validString(CharSequence str) {
    return !(str == null || str.length() == 0);
  }
}