/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.core.message;

import static java.util.Collections.emptyMap;
import static java.util.Objects.requireNonNull;

import com.google.common.collect.ImmutableMap;

import java.util.LinkedList;
import java.util.Map;
import java.util.Objects;

/**
 * Representation of metadata associated to a part in a {@link org.mule.runtime.api.message.MultiPartPayload}.
 *
 * @since 4.0
 */
public class PartAttributes extends BaseAttributes {

  private static final long serialVersionUID = -4718443205714605260L;

  private Map<String, LinkedList<String>> headers;

  private String name;

  private String fileName;

  private long size;

  /**
   * Builds a new instance of this attributes with the given parameters.
   * 
   * @param name The name of the part.
   * @param fileName The name of the file of the attachment, or {@code null} if it wasn't provided.
   * @param size The size in bytes of the attachment, or -1 if unknown or undetermined.
   * @param headers The headers relative to the attachment part.
   */
  public PartAttributes(String name, String fileName, long size, Map<String, LinkedList<String>> headers) {
    this.name = requireNonNull(name);
    this.fileName = fileName;
    this.size = size;
    this.headers = ImmutableMap.copyOf(headers);
  }

  /**
   * Builds a new instance of this attributes with the given name.
   * 
   * @param name The name of the part.
   */
  public PartAttributes(String name) {
    this(name, null, -1, emptyMap());
  }

  /**
   * @return The name of the part.
   */
  public String getName() {
    return name;
  }

  /**
   * @return The name of the file of the attachment, or {@code null} if it wasn't provided.
   */
  public String getFileName() {
    return fileName;
  }

  /**
   * @return The size in bytes of the attachment, as provided by the source. In case it is unknown or cannot be determined, -1
   *         will be returned.
   */
  public long getSize() {
    return size;
  }

  /**
   * TODO Replace with ParameterMap
   * 
   * @return The headers relative to the attachment part.
   */
  public Map<String, LinkedList<String>> getHeaders() {
    return headers;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || this.getClass() != o.getClass()) {
      return false;
    }
    PartAttributes that = (PartAttributes) o;
    return this.size == that.size &&
        Objects.equals(this.headers, that.headers) &&
        Objects.equals(this.name, that.name) &&
        Objects.equals(this.fileName, that.fileName);
  }

  @Override
  public int hashCode() {
    return Objects.hash(this.headers, this.name, this.fileName, this.size);
  }
}