/**
    * Portions of this software was developed by employees of the National Institute
    * of Standards and Technology (NIST), an agency of the Federal Government and is
    * being made available as a public service. Pursuant to title 17 United States
    * Code Section 105, works of NIST employees are not subject to copyright
    * protection in the United States. This software may be subject to foreign
    * copyright. Permission in the United States and in foreign countries, to the
    * extent that NIST may hold copyright, to use, copy, modify, create derivative
    * works, and distribute this software and its documentation without fee is hereby
   * granted on a non-exclusive basis, provided that this notice and disclaimer
   * of warranty appears in all copies.
   *
   * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
   * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
   * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
   * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
   * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
   * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
   * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
   * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
   * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
   * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
   * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
   */
  
  package gov.nist.secauto.decima.core.requirement;
  
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.LinkedHashMap;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  
  public class DefaultRequirementsManager implements MutableRequirementsManager, RequirementAppender {
  
    private List<URI> requirementDefinitions = new LinkedList<>();
    private Map<String, BaseRequirement> baseRequirements = new LinkedHashMap<>();
    private Map<String, DerivedRequirement> derivedRequirements = new LinkedHashMap<>();
  
    public DefaultRequirementsManager() {
    }
  
    public List<URI> getRequirementDefinitions() {
      return Collections.unmodifiableList(requirementDefinitions);
    }
  
    @Override
    public DefaultRequirementsManager addRequirementDefinition(URI definition) {
      requirementDefinitions.add(definition);
      return this;
    }
  
    @Override
    public BaseRequirement getBaseRequirementById(String id) {
      return baseRequirements.get(id);
    }
  
    @Override
    public Collection<BaseRequirement> getBaseRequirements() {
      return baseRequirements.values();
    }
  
    @Override
    public DerivedRequirement getDerivedRequirementById(String id) {
      return derivedRequirements.get(id);
    }
  
    @Override
    public DefaultRequirementsManager addBaseRequirement(BaseRequirement baseRequirement) {
      if (baseRequirements.containsKey(baseRequirement.getId())) {
        throw new IllegalArgumentException("A base requirement already exists with the id: " + baseRequirement.getId());
      }
      baseRequirements.put(baseRequirement.getId(), baseRequirement);
  
      for (DerivedRequirement derivedRequirement : baseRequirement.getDerivedRequirements()) {
        if (derivedRequirements.containsKey(derivedRequirement.getId())) {
          throw new IllegalArgumentException(
              "A derived requirement already exists with the id: " + derivedRequirement.getId());
        }
        derivedRequirements.put(derivedRequirement.getId(), derivedRequirement);
      }
      return this;
    }
  
    @Override
    public DefaultRequirementsManager load(URL url, RequirementsParser parser)
        throws RequirementsParserException, URISyntaxException {
      parser.parse(url, this);
      // addRequirementDefinition(url.toURI());
      return this;
    }
  }