// Copyright 2016 The Domain Registry 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.export.sheet;

import static com.google.common.base.MoreObjects.firstNonNull;
import static google.registry.model.registrar.RegistrarContact.Type.ABUSE;
import static google.registry.model.registrar.RegistrarContact.Type.ADMIN;
import static google.registry.model.registrar.RegistrarContact.Type.BILLING;
import static google.registry.model.registrar.RegistrarContact.Type.LEGAL;
import static google.registry.model.registrar.RegistrarContact.Type.MARKETING;
import static google.registry.model.registrar.RegistrarContact.Type.TECH;
import static google.registry.model.registrar.RegistrarContact.Type.WHOIS;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Predicate;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Ordering;
import com.google.gdata.util.ServiceException;
import google.registry.model.registrar.Registrar;
import google.registry.model.registrar.RegistrarAddress;
import google.registry.model.registrar.RegistrarContact;
import google.registry.util.Clock;
import google.registry.util.DateTimeUtils;
import java.io.IOException;
import javax.annotation.Nullable;
import javax.inject.Inject;
import org.joda.time.DateTime;
import org.joda.time.Duration;

/**
 * Class for synchronizing all {@link Registrar} datastore objects to a Google Spreadsheet.
 *
 * @see SyncRegistrarsSheetAction
 */
class SyncRegistrarsSheet {

  @Inject Clock clock;
  @Inject SheetSynchronizer sheetSynchronizer;
  @Inject SyncRegistrarsSheet() {}

  /** Returns true if a {@link Registrar} entity was modified in past {@code duration}. */
  boolean wasRegistrarsModifiedInLast(Duration duration) {
    DateTime watermark = clock.nowUtc().minus(duration);
    for (Registrar registrar : Registrar.loadAll()) {
      if (DateTimeUtils.isAtOrAfter(registrar.getLastUpdateTime(), watermark)) {
        return true;
      }
    }
    return false;
  }

  /** Performs the synchronization operation. */
  void run(String spreadsheetId) throws IOException, ServiceException {
    sheetSynchronizer.synchronize(
        spreadsheetId,
        FluentIterable
            .from(
                new Ordering<Registrar>() {
                  @Override
                  public int compare(Registrar left, Registrar right) {
                    return left.getClientIdentifier().compareTo(right.getClientIdentifier());
                  }
                }.immutableSortedCopy(Registrar.loadAll()))
            .filter(
                new Predicate<Registrar>() {
                  @Override
                  public boolean apply(Registrar registrar) {
                    return registrar.getType() == Registrar.Type.REAL
                        || registrar.getType() == Registrar.Type.OTE;
                  }
                })
            .transform(
                new Function<Registrar, ImmutableMap<String, String>>() {
                  @Override
                  public ImmutableMap<String, String> apply(Registrar registrar) {
                    ImmutableMap.Builder<String, String> builder = new ImmutableMap.Builder<>();
                    ImmutableSortedSet<RegistrarContact> contacts = registrar.getContacts();
                    RegistrarAddress address =
                        firstNonNull(
                            registrar.getLocalizedAddress(),
                            firstNonNull(
                                registrar.getInternationalizedAddress(),
                                new RegistrarAddress.Builder()
                                    .setStreet(ImmutableList.of("UNKNOWN"))
                                    .setCity("UNKNOWN")
                                    .setCountryCode("US")
                                    .build()));
                    //
                    // （╯°□°）╯ WARNING WARNING WARNING
                    //
                    // Do not change these mappings simply because the Registrar model changed. Only
                    // change these mappings if the people who use the spreadsheet requested it be
                    // changed.
                    //
                    // These values are hard-coded because they correspond to actual spreadsheet
                    // columns. If you change this dictionary, then you'll need to manually add new
                    // columns to the registrar spreadsheets for all environments before deployment,
                    // and you'll need to remove deleted columns probably like a week after
                    // deployment.
                    //
                    builder.put("clientIdentifier", convert(registrar.getClientIdentifier()));
                    builder.put("registrarName", convert(registrar.getRegistrarName()));
                    builder.put("state", convert(registrar.getState()));
                    builder.put("ianaIdentifier", convert(registrar.getIanaIdentifier()));
                    builder.put("billingIdentifier", convert(registrar.getBillingIdentifier()));
                    builder.put("primaryContacts", convertContacts(contacts, byType(ADMIN)));
                    builder.put("techContacts", convertContacts(contacts, byType(TECH)));
                    builder.put("marketingContacts", convertContacts(contacts, byType(MARKETING)));
                    builder.put("abuseContacts", convertContacts(contacts, byType(ABUSE)));
                    builder.put("whoisInquiryContacts", convertContacts(contacts, byType(WHOIS)));
                    builder.put("legalContacts", convertContacts(contacts, byType(LEGAL)));
                    builder.put("billingContacts", convertContacts(contacts, byType(BILLING)));
                    builder.put(
                        "contactsMarkedAsWhoisAdmin",
                        convertContacts(
                            contacts,
                            new Predicate<RegistrarContact>() {
                              @Override
                              public boolean apply(RegistrarContact contact) {
                                return contact.getVisibleInWhoisAsAdmin();
                              }
                            }));
                    builder.put(
                        "contactsMarkedAsWhoisTech",
                        convertContacts(
                            contacts,
                            new Predicate<RegistrarContact>() {
                              @Override
                              public boolean apply(RegistrarContact contact) {
                                return contact.getVisibleInWhoisAsTech();
                              }
                            }));
                    builder.put("emailAddress", convert(registrar.getEmailAddress()));
                    builder.put("address.street", convert(address.getStreet()));
                    builder.put("address.city", convert(address.getCity()));
                    builder.put("address.state", convert(address.getState()));
                    builder.put("address.zip", convert(address.getZip()));
                    builder.put("address.countryCode", convert(address.getCountryCode()));
                    builder.put("phoneNumber", convert(registrar.getPhoneNumber()));
                    builder.put("faxNumber", convert(registrar.getFaxNumber()));
                    builder.put("creationTime", convert(registrar.getCreationTime()));
                    builder.put("lastUpdateTime", convert(registrar.getLastUpdateTime()));
                    builder.put("allowedTlds", convert(registrar.getAllowedTlds()));
                    builder.put("whoisServer", convert(registrar.getWhoisServer()));
                    builder.put("blockPremiumNames", convert(registrar.getBlockPremiumNames()));
                    builder.put("ipAddressWhitelist", convert(registrar.getIpAddressWhitelist()));
                    builder.put("url", convert(registrar.getUrl()));
                    builder.put("referralUrl", convert(registrar.getReferralUrl()));
                    builder.put("icannReferralEmail", convert(registrar.getIcannReferralEmail()));
                    return builder.build();
                  }
                })
            .toList());
  }

  private static String convertContacts(
      Iterable<RegistrarContact> contacts, Predicate<RegistrarContact> filter) {
    StringBuilder result = new StringBuilder();
    boolean first = true;
    for (RegistrarContact contact : contacts) {
      if (!filter.apply(contact)) {
        continue;
      }
      if (first) {
        first = false;
      } else {
        result.append("\n");
      }
      result.append(contact.toStringMultilinePlainText());
    }
    return result.toString();
  }

  private static Predicate<RegistrarContact> byType(final RegistrarContact.Type type) {
    return new Predicate<RegistrarContact>() {
      @Override
      public boolean apply(RegistrarContact contact) {
        return contact.getTypes().contains(type);
      }};
  }

  /** Converts a value to a string representation that can be stored in a spreadsheet cell. */
  private static String convert(@Nullable Object value) {
    if (value == null) {
      return "";
    } else if (value instanceof Iterable) {
      return Joiner.on('\n').join((Iterable<?>) value);
    } else {
      return value.toString();
    }
  }
}