/* ====================================================================
   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.
==================================================================== 

 * Copyright (c) 2006, Wygwam
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met: 
 * 
 * - Redistributions of source code must retain the above copyright notice, 
 * this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the documentation and/or 
 * other materials provided with the distribution.
 * - Neither the name of Wygwam nor the names of its contributors may be 
 * used to endorse or promote products derived from this software without 
 * specific prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.openxml4j.opc;

import java.net.URI;
import java.net.URISyntaxException;

/**
 * A part relationship.
 * 
 * @author Julien Chable
 * @version 1.0
 */
public final class PackageRelationship {

	private static URI containerRelationshipPart;

	static {
		try {
			containerRelationshipPart = new URI("/_rels/.rels");
		} catch (URISyntaxException e) {
			// Do nothing
		}
	}

	/* XML markup */

	public static final String ID_ATTRIBUTE_NAME = "Id";

	public static final String RELATIONSHIPS_TAG_NAME = "Relationships";

	public static final String RELATIONSHIP_TAG_NAME = "Relationship";

	public static final String TARGET_ATTRIBUTE_NAME = "Target";

	public static final String TARGET_MODE_ATTRIBUTE_NAME = "TargetMode";

	public static final String TYPE_ATTRIBUTE_NAME = "Type";

	/* End XML markup */

	/**
	 * L'ID de la relation.
	 */
	private String id;

	/**
	 * R�f�rence vers le package.
	 */
	private Package container;

	/**
	 * Type de relation.
	 */
	private String relationshipType;

	/**
	 * Partie source de cette relation.
	 */
	private PackagePart source;

	/**
	 * Le mode de ciblage [Internal|External]
	 */
	private TargetMode targetMode;

	/**
	 * URI de la partie cible.
	 */
	private URI targetUri;

	/**
	 * Constructor.
	 * 
	 * @param packageParent
	 * @param sourcePart
	 * @param targetUri
	 * @param targetMode
	 * @param relationshipType
	 * @param id
	 */
	public PackageRelationship(Package pkg, PackagePart sourcePart,
			URI targetUri, TargetMode targetMode, String relationshipType,
			String id) {
		if (pkg == null)
			throw new IllegalArgumentException("pkg");
		if (targetUri == null)
			throw new IllegalArgumentException("targetUri");
		if (relationshipType == null)
			throw new IllegalArgumentException("relationshipType");
		if (id == null)
			throw new IllegalArgumentException("id");

		this.container = pkg;
		this.source = sourcePart;
		this.targetUri = targetUri;
		this.targetMode = targetMode;
		this.relationshipType = relationshipType;
		this.id = id;
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof PackageRelationship)) {
			return false;
		}
		PackageRelationship rel = (PackageRelationship) obj;
		return (this.id == rel.id
				&& this.relationshipType == rel.relationshipType
				&& (rel.source != null ? rel.source.equals(this.source) : true)
				&& this.targetMode == rel.targetMode && this.targetUri
				.equals(rel.targetUri));
	}

	@Override
	public int hashCode() {
		return this.id.hashCode() + this.relationshipType.hashCode()
				+ this.source.hashCode() + this.targetMode.hashCode()
				+ this.targetUri.hashCode();
	}

	/* Getters */

	public URI getContainerPartRelationship() {
		return containerRelationshipPart;
	}

	/**
	 * @return the container
	 */
	public Package getPackage() {
		return container;
	}

	/**
	 * @return the id
	 */
	public String getId() {
		return id;
	}

	/**
	 * @return the relationshipType
	 */
	public String getRelationshipType() {
		return relationshipType;
	}

	/**
	 * @return the source
	 */
	public PackagePart getSource() {
		return source;
	}

	/**
	 * 
	 * @return
	 */
	public URI getSourceURI() {
		if (source == null) {
			return PackagingURIHelper.PACKAGE_ROOT_URI;
		}
		return source.partName.getURI();
	}

	/**
	 * public URI getSourceUri(){ }
	 * 
	 * @return the targetMode
	 */
	public TargetMode getTargetMode() {
		return targetMode;
	}

	/**
	 * @return the targetUri
	 */
	public URI getTargetURI() {
		// If it's an external target, we don't
		//  need to apply our normal validation rules
		if(targetMode == TargetMode.EXTERNAL) {
			return targetUri;
		}
		
		// Internal target
		// If it isn't absolute, resolve it relative
		//  to ourselves
		if (!targetUri.toASCIIString().startsWith("/")) {
			// So it's a relative part name, try to resolve it
			return PackagingURIHelper.resolvePartUri(getSourceURI(), targetUri);
		}
		return targetUri;
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append(id == null ? "id=null" : "id=" + id);
		sb.append(container == null ? " - container=null" : " - container="
				+ container.toString());
		sb.append(relationshipType == null ? " - relationshipType=null"
				: " - relationshipType=" + relationshipType.toString());
		sb.append(source == null ? " - source=null" : " - source="
				+ getSourceURI().toASCIIString());
		sb.append(targetUri == null ? " - target=null" : " - target="
				+ getTargetURI().toASCIIString());
		sb.append(targetMode == null ? ",targetMode=null" : ",targetMode="
				+ targetMode.toString());
		return sb.toString();
	}
}