// 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 com.google.domain.registry.tools;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.domain.registry.model.registry.Registries.assertTldExists;
import static com.google.domain.registry.util.CollectionUtils.nullToEmpty;

import com.google.common.collect.ImmutableSet;
import com.google.domain.registry.model.registry.Registry;

import com.beust.jcommander.Parameter;
import com.beust.jcommander.Parameters;

import java.util.List;

import javax.annotation.Nullable;

/** Command to update a TLD. */
@Parameters(separators = " =", commandDescription = "Update existing TLD(s)")
class UpdateTldCommand extends CreateOrUpdateTldCommand {
  @Nullable
  @Parameter(
      names = "--add_reserved_lists",
      description = "A comma-separated list of reserved list names to be added to the TLD")
  List<String> reservedListsAdd;

  @Nullable
  @Parameter(
      names = "--remove_reserved_lists",
      description = "A comma-separated list of reserved list names to be removed from the TLD")
  List<String> reservedListsRemove;

  @Nullable
  @Parameter(
      names = "--add_allowed_registrants",
      description = "A comma-separated list of allowed registrants to be added to the TLD")
  List<String> allowedRegistrantsAdd;

  @Nullable
  @Parameter(
      names = "--remove_allowed_registrants",
      description = "A comma-separated list of allowed registrants to be removed from the TLD")
  List<String> allowedRegistrantsRemove;

  @Nullable
  @Parameter(
      names = "--add_allowed_nameservers",
      description = "A comma-separated list of allowed nameservers to be added to the TLD")
  List<String> allowedNameserversAdd;

  @Nullable
  @Parameter(
      names = "--remove_allowed_nameservers",
      description = "A comma-separated list of allowed nameservers to be removed from the TLD")
  List<String> allowedNameserversRemove;

  @Override
  Registry getOldRegistry(String tld) {
    return Registry.get(assertTldExists(tld));
  }

  @Override
  protected void initTldCommand() throws Exception {
    checkConflicts("reserved_lists", reservedListNames, reservedListsAdd, reservedListsRemove);
    checkConflicts(
        "allowed_registrants", allowedRegistrants, allowedRegistrantsAdd, allowedRegistrantsRemove);
    checkConflicts(
        "allowed_nameservers", allowedNameservers, allowedNameserversAdd, allowedNameserversRemove);
    reservedListNamesToAdd = ImmutableSet.copyOf(nullToEmpty(reservedListsAdd));
    reservedListNamesToRemove = ImmutableSet.copyOf(nullToEmpty(reservedListsRemove));
    allowedRegistrantsToAdd = ImmutableSet.copyOf(nullToEmpty(allowedRegistrantsAdd));
    allowedRegistrantsToRemove = ImmutableSet.copyOf(nullToEmpty(allowedRegistrantsRemove));
    allowedNameserversToAdd = ImmutableSet.copyOf(nullToEmpty(allowedNameserversAdd));
    allowedNameserversToRemove = ImmutableSet.copyOf(nullToEmpty(allowedNameserversRemove));
  }

  private void checkConflicts(
      String baseFlagName, Object overwriteValue, Object addValue, Object removeValue) {
    checkNotBoth(baseFlagName, overwriteValue, "add_" + baseFlagName, addValue);
    checkNotBoth(baseFlagName, overwriteValue, "remove_" + baseFlagName, removeValue);
  }

  private void checkNotBoth(String nameA, Object valueA, String nameB, Object valueB) {
    checkArgument(valueA == null || valueB == null, "Don't pass both --%s and --%s", nameA, nameB);
  }
}