// Copyright 2017 The Nomulus Authors. All Rights Reserved.
//
// 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 google.registry.whois;

import static com.google.common.base.Preconditions.checkNotNull;

import google.registry.model.registrar.Registrar;
import google.registry.model.registrar.RegistrarContact;
import java.util.Set;
import javax.annotation.Nullable;
import org.joda.time.DateTime;

/** Container for WHOIS responses to registrar lookup queries. */
class RegistrarWhoisResponse extends WhoisResponseImpl {

  /** Registrar which was the target of this WHOIS command. */
  private final Registrar registrar;

  /**
   * Used in the emitter below to signal either admin or tech
   * contacts.  NB, this is purposely distinct from the
   * RegistrarContact.Type.{ADMIN,TECH} as they don't carry equivalent
   * meaning in our system. Sigh.
   */
  private enum AdminOrTech { ADMIN, TECH }

  /** Creates a new WHOIS registrar response on the given registrar object. */
  RegistrarWhoisResponse(Registrar registrar, DateTime timestamp) {
    super(timestamp);
    this.registrar = checkNotNull(registrar, "registrar");
  }

  @Override
  public WhoisResponseResults getResponse(boolean preferUnicode, String disclaimer) {
    Set<RegistrarContact> contacts = registrar.getContacts();
    String plaintext =
        new RegistrarEmitter()
            .emitField("Registrar", registrar.getRegistrarName())
            .emitAddress(
                null,
                chooseByUnicodePreference(
                    preferUnicode,
                    registrar.getLocalizedAddress(),
                    registrar.getInternationalizedAddress()),
                true)
            .emitPhonesAndEmail(
                registrar.getPhoneNumber(), registrar.getFaxNumber(), registrar.getEmailAddress())
            .emitField("Registrar WHOIS Server", registrar.getWhoisServer())
            .emitField("Registrar URL", registrar.getUrl())
            .emitRegistrarContacts("Admin", contacts, AdminOrTech.ADMIN)
            .emitRegistrarContacts("Technical", contacts, AdminOrTech.TECH)
            .emitLastUpdated(getTimestamp())
            .emitFooter(disclaimer)
            .toString();
    return WhoisResponseResults.create(plaintext, 1);
  }

  /** An emitter with logic for registrars. */
  static class RegistrarEmitter extends Emitter<RegistrarEmitter> {
    /** Emits the registrar contact of the given type. */
    RegistrarEmitter emitRegistrarContacts(
        String contactLabel,
        Iterable<RegistrarContact> contacts,
        AdminOrTech type) {
      for (RegistrarContact contact : contacts) {
        if ((type == AdminOrTech.ADMIN && contact.getVisibleInWhoisAsAdmin())
            || (type == AdminOrTech.TECH && contact.getVisibleInWhoisAsTech())) {
          emitField(contactLabel + " Contact", contact.getName())
              .emitPhonesAndEmail(
                  contact.getPhoneNumber(),
                  contact.getFaxNumber(),
                  contact.getEmailAddress());
        }
      }
      return this;
    }

    /** Emits the registrar contact of the given type. */
    RegistrarEmitter emitPhonesAndEmail(
        @Nullable String phone, @Nullable String fax, @Nullable String email) {
      return emitField("Phone Number", phone)
          .emitField("Fax Number", fax)
          .emitField("Email", email);
    }
  }
}
