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/* See LICENSE for licensing and NOTICE for copyright. */
package org.cryptacular.x509.dn;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Ordered list of {@link Attribute}s.
 *
 * @author  Middleware Services
 */
public class Attributes implements Iterable
{

  /** Underlying attributes. */
  private final List attributes = new ArrayList<>(5);


  /**
   * Adds an attribute by type and value to the end of the attribute list.
   *
   * @param  typeOid  OID of attribute type.
   * @param  value  Attribute value.
   */
  public void add(final String typeOid, final String value)
  {
    final StandardAttributeType type = StandardAttributeType.fromOid(typeOid);
    if (type != null) {
      add(new Attribute(type, value));
    } else {
      add(new Attribute(new UnknownAttributeType(typeOid), value));
    }
  }


  /**
   * Adds the given attribute to the end of the attribute list.
   *
   * @param  attr  Non-null attribute.
   */
  public void add(final Attribute attr)
  {
    if (attr == null) {
      throw new IllegalArgumentException("Attribute cannot be null");
    }
    attributes.add(attr);
  }


  /**
   * Gets the number of attributes contained in this instance.
   *
   * @return  Number of attributes.
   */
  public int size()
  {
    return attributes.size();
  }


  /**
   * Gets an immutable list of attributes.
   *
   * @return  Non-null immutable attribute list.
   */
  public List getAll()
  {
    return Collections.unmodifiableList(attributes);
  }


  /**
   * Gets an immutable list of all attributes of the given type. The order of the returned list reflects the ordering of
   * the underlying attributes.
   *
   * @param  type  Attribute type.
   *
   * @return  Non-null list of attributes of given type. An empty list is returned if there are no attributes of the
   *          given type.
   */
  public List getValues(final AttributeType type)
  {
    final List values = new ArrayList<>(attributes.size());
    values.addAll(
      attributes.stream().filter(
        attr -> attr.getType().equals(type)).map(Attribute::getValue).collect(Collectors.toList()));
    return Collections.unmodifiableList(values);
  }


  /**
   * Gets the first value of the given type that appears in the attribute list.
   *
   * @param  type  Attribute type.
   *
   * @return  Value of first attribute of given type or null if no attributes of given type exist.
   */
  public String getValue(final AttributeType type)
  {
    for (Attribute attr : attributes) {
      if (attr.getType().equals(type)) {
        return attr.getValue();
      }
    }
    return null;
  }


  @Override
  public Iterator iterator()
  {
    return attributes.iterator();
  }
}