/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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.opencastproject.list.common.query;
  
  import org.opencastproject.list.api.DefaultResourceListQuery;
  import org.opencastproject.list.api.ResourceListFilter;
  import org.opencastproject.list.api.ResourceListQuery;
  import org.opencastproject.list.common.provider.JobsListProvider;
  import org.opencastproject.list.common.provider.ServersListProvider;
  import org.opencastproject.list.util.FiltersUtils;
  
  import java.util.Optional;
  
  /**
   * Query for the jobs list.
   *
   * The following filters can be used:
   * <ul>
   * <li>hostname</li>
   * <li>status</li>
   * </ul>
   */
  public class JobsListQuery extends DefaultResourceListQuery {
  
    /** Prefix for the filter labels. */
    private static final String FILTER_PREFIX = "FILTERS.JOBS";
    /** Hostname filter name. */
    public static final String FILTER_NAME_HOSTNAME = "hostname";
    /** Hostname filter label. */
    public static final String FILTER_LABEL_HOSTNAME = FILTER_PREFIX + ".HOSTNAME.LABEL";
    /** NodeName filter name. */
    public static final String FILTER_NAME_NODE_NAME = "nodeName";
    /** NodeName filter label. */
    public static final String FILTER_LABEL_NODE_NAME = FILTER_PREFIX + ".NODE_NAME.LABEL";
    /** Status filter name. */
    public static final String FILTER_NAME_STATUS = "status";
    /** Status filter label. */
    public static final String FILTER_LABEL_STATUS = FILTER_PREFIX + ".STATUS.LABEL";
  
    /** Default constructor. */
    public JobsListQuery() {
      super();
      availableFilters.add(createHostnameFilter(Optional.<String> empty()));
      availableFilters.add(createNodeNameFilter(Optional.<String> empty()));
      availableFilters.add(createStatusFilter(Optional.<String> empty()));
    }
  
    /**
     * Copy constructor for the base class {@code ResourceListQuery}.
     *
     * @param query copy values from the given query
     */
    public JobsListQuery(ResourceListQuery query) {
      this();
      availableFilters.addAll(query.getAvailableFilters());
  
      for (ResourceListFilter filter : query.getFilters()) {
        addFilter(filter);
      }
  
      sortBy = query.getSortBy();
      if (query.getOffset().isPresent()) {
        setOffset(query.getOffset().get());
      }
      if (query.getLimit().isPresent()) {
        setLimit(query.getLimit().get());
      }
    }
  
    /**
     * Add a {@link ResourceListFilter} filter to the query with the given hostname.
     *
     * @param hostname the hostname to filter for
     */
    public void withHostname(String hostname) {
      addFilter(createHostnameFilter(Optional.ofNullable(hostname)));
    }
  
    /**
     * Add a {@link ResourceListFilter} filter to the query with the given node name.
    *
    * @param nodeName the node name to filter for
    */
   public void withNodeName(String nodeName) {
     addFilter(createNodeNameFilter(Optional.ofNullable(nodeName)));
   }
 
   /**
    * Add a {@link ResourceListFilter} filter to the query with the given status.
    *
    * @param status the status to filter for
    */
   public void withStatus(String status) {
     addFilter(createStatusFilter(Optional.ofNullable(status)));
   }
 
   /**
    * Add a {@link ResourceListFilter} filter to the query with the given free text.
    *
    * @param freeText the free text to filter for
    */
   public void withFreeText(String freeText) {
     addFilter(createFreeTextFilter(Optional.ofNullable(freeText)));
   }
 
   /**
    * Returns an {@link Optional} containing the hostname used to filter if set.
    * {@link Optional#empty()} otherwise.
    *
    * @return an {@link Optional} containing the hostname or none.
    */
   public Optional<String> getHostname() {
     return getFilterValue(FILTER_NAME_HOSTNAME);
   }
 
   /**
    * Returns an {@link Optional} containing the node name used to filter if set.
    * {@link Optional#empty()} otherwise.
    *
    * @return an {@link Optional} containing the node name or none.
    */
   public Optional<String> getNodeName() {
     return getFilterValue(FILTER_NAME_NODE_NAME);
   }
 
   /**
    * Returns an {@link Optional} containing the status used to filter if set.
    * {@link Optional#empty()} otherwise.
    *
    * @return an {@link Optional} containing the status or none.
    */
   public Optional<String> getStatus() {
     return getFilterValue(FILTER_NAME_STATUS);
   }
 
   /**
    * Returns an {@link Optional} containing the free text used to filter if set.
    * {@link Optional#empty()} otherwise.
    *
    * @return an {@link Optional} containing the free text or none.
    */
   public Optional<String> getFreeText() {
     return getFilterValue(ResourceListFilter.FREETEXT);
   }
 
   /**
    * Create a new {@link ResourceListFilter} based on a hostname.
    *
    * @param value the hostname to filter on wrapped in an {@link Optional} or {@link Optional#empty()}
    * @return a new {@link ResourceListFilter} for a hostname based query
    */
   public static <String> ResourceListFilter<String> createHostnameFilter(Optional<String> value) {
     return FiltersUtils.generateFilter(
             value,
             FILTER_NAME_HOSTNAME,
             FILTER_LABEL_HOSTNAME,
             ResourceListFilter.SourceType.SELECT,
             Optional.of(ServersListProvider.LIST_HOSTNAME));
   }
 
   /**
    * Create a new {@link ResourceListFilter} based on a nodeName.
    *
    * @param value the nodeName to filter on wrapped in an {@link Optional} or {@link Optional#empty()}
    * @return a new {@link ResourceListFilter} for a nodeName based query
    */
   public static ResourceListFilter<String> createNodeNameFilter(Optional<String> value) {
     return FiltersUtils.generateFilter(
             value,
             FILTER_NAME_NODE_NAME,
             FILTER_LABEL_NODE_NAME,
             ResourceListFilter.SourceType.SELECT,
             Optional.of(ServersListProvider.LIST_NODE_NAME));
   }
 
   /**
    * Create a new {@link ResourceListFilter} based on a status.
    *
    * @param value the status to filter on wrapped in an {@link Optional} or {@link Optional#empty()}
    * @return a new {@link ResourceListFilter} for a status based query
    */
   public static <String> ResourceListFilter<String> createStatusFilter(Optional<String> value) {
     return FiltersUtils.generateFilter(
             value,
             FILTER_NAME_STATUS,
             FILTER_LABEL_STATUS,
             ResourceListFilter.SourceType.SELECT,
             Optional.of(JobsListProvider.LIST_STATUS));
   }
 
   /**
    * Create a new {@link ResourceListFilter} based on a free text.
    *
    * @param value the free text to filter on wrapped in an {@link Optional} or {@link Optional#empty()}
    * @return a new {@link ResourceListFilter} for a free text based query
    */
   public static <String> ResourceListFilter<String> createFreeTextFilter(Optional<String> value) {
     return FiltersUtils.generateFilter(
             value,
             ResourceListFilter.FREETEXT,
             ResourceListFilter.FREETEXT,
             ResourceListFilter.SourceType.FREETEXT,
             null);
   }
 }