/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.management.internal.cli.converters;

import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import org.apache.geode.management.cli.ConverterHint;
import org.apache.geode.management.internal.cli.shell.Gfsh;

import org.springframework.shell.core.Completion;
import org.springframework.shell.core.Converter;
import org.springframework.shell.core.MethodTarget;

/**
 *
 *
 * @since GemFire 8.0
 */
public class LocatorDiscoveryConfigConverter implements Converter<String> {
  @Override
  public boolean supports(Class<?> type, String optionContext) {
    return String.class.equals(type)
        && ConverterHint.LOCATOR_DISCOVERY_CONFIG.equals(optionContext);
  }

  @Override
  public String convertFromText(String value, Class<?> targetType, String optionContext) {
    return value;
  }

  @Override
  public boolean getAllPossibleValues(List<Completion> completions, Class<?> targetType,
      String existingData, String optionContext, MethodTarget target) {
    if (String.class.equals(targetType)
        && ConverterHint.LOCATOR_DISCOVERY_CONFIG.equals(optionContext)) {
      Set<String> locatorIdsAndNames = getLocatorIdAndNames();

      for (String string : locatorIdsAndNames) {
        completions.add(new Completion(string));
      }
    }

    return !completions.isEmpty();
  }

  private Set<String> getLocatorIdAndNames() {
    final Set<String> locatorIdsAndNames = new TreeSet<String>();

    final Gfsh gfsh = Gfsh.getCurrentInstance();

    if (gfsh != null && gfsh.isConnectedAndReady()) {
      final String[] locatorIds =
          gfsh.getOperationInvoker().getDistributedSystemMXBean().listLocators();

      if (locatorIds != null && locatorIds.length != 0) {
        locatorIdsAndNames.addAll(Arrays.asList(locatorIds));
      }
    }

    return locatorIdsAndNames;
  }

}
