/*******************************************************************************
 * Copyright (C) 2021 the Eclipse BaSyx Authors
 * 
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 * 
 * SPDX-License-Identifier: EPL-2.0
 ******************************************************************************/
package org.eclipse.basyx.submodel.factory.xml.converters.qualifier;

import java.util.Map;

import org.eclipse.basyx.submodel.factory.xml.XMLHelper;
import org.eclipse.basyx.submodel.metamodel.api.identifier.IdentifierType;
import org.eclipse.basyx.submodel.metamodel.api.qualifier.IIdentifiable;
import org.eclipse.basyx.submodel.metamodel.map.qualifier.AdministrativeInformation;
import org.eclipse.basyx.submodel.metamodel.map.qualifier.Identifiable;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import com.google.common.base.Strings;

/**
 * Handles the conversion between an IIdentifiable object and the XML tags<br>
 * &lt;aas:administration&gt; and &lt;aas:identification&gt; in both directions
 * 
 * @author conradi
 *
 */
public class IdentifiableXMLConverter {

	public static final String ADMINISTRATION = "aas:administration";
	public static final String VERSION = "aas:version";
	public static final String REVISION = "aas:revision";
	public static final String IDENTIFICATION = "aas:identification";
	public static final String IDTYPE = "idType";
	
	
	/**
	 * Populates a given Identifiable object with the data form the given XML
	 * 
	 * @param xmlObject the XML map containing the &lt;aas:administration&gt; and &lt;aas:identification&gt; tags
	 * @param identifiable the Identifiable object to be populated
	 */
	@SuppressWarnings("unchecked")
	public static void populateIdentifiable(Map<String, Object> xmlObject, Identifiable identifiable) {
		ReferableXMLConverter.populateReferable(xmlObject, identifiable);
		
		Map<String, Object> identierFromXML = (Map<String, Object>) xmlObject.get(IDENTIFICATION);
		if (identierFromXML == null) {
			throw createInvalidIdentifierException(xmlObject);
		}
		String id = XMLHelper.getString(identierFromXML.get(XMLHelper.TEXT));
		String idType = XMLHelper.getString(identierFromXML.get(IDTYPE));
		if (Strings.isNullOrEmpty(id) || Strings.isNullOrEmpty(idType)) {
			throw createInvalidIdentifierException(xmlObject);
		}
		identifiable.setIdentification(IdentifierType.fromString(idType), id);

		Map<String, Object> administrationFromXML = (Map<String, Object>) xmlObject.get(ADMINISTRATION);
		if(administrationFromXML != null) {
			String version = XMLHelper.getString(administrationFromXML.get(VERSION));
			String revision = XMLHelper.getString(administrationFromXML.get(REVISION));
			identifiable.setAdministration(new AdministrativeInformation(version, revision));
		}
	}
	

	
	
	/**
	 * Populates a given XML map with the data form a given IIdentifiable object<br>
	 * Creates the &lt;aas:administration&gt; and &lt;aas:identification&gt; tags in the given root
	 * 
	 * @param document the XML document
	 * @param root the XML root Element to be populated
	 * @param identifiable the IIdentifiable object to be converted to XML
	 */
	public static void populateIdentifiableXML(Document document, Element root, IIdentifiable identifiable) {
		ReferableXMLConverter.populateReferableXML(document, root, identifiable);
		
		//Build the identification if present
		if (identifiable.getIdentification() != null) {
			String id = identifiable.getIdentification().getId();
			Element identificationRoot = document.createElement(IDENTIFICATION);
			identificationRoot.appendChild(document.createTextNode(id));
			if(identifiable.getIdentification().getIdType() != null) {
				IdentifierType idType = identifiable.getIdentification().getIdType();
				identificationRoot.setAttribute(IDTYPE, idType.toString());
			}
			root.appendChild(identificationRoot);
		}
		
		//Build the administration if present
		if(identifiable.getAdministration() != null) {
			Element version = null;
			Element revision = null;
			
			String versionString = identifiable.getAdministration().getVersion();
			if(versionString != null && !versionString.isEmpty()) {
				version = document.createElement(VERSION);
				version.appendChild(document.createTextNode(versionString));
				
			}
			
			String revisionString = identifiable.getAdministration().getRevision();
			if(revisionString != null && !revisionString.isEmpty()) {
				revision = document.createElement(REVISION);
				revision.appendChild(document.createTextNode(revisionString));
			}
			
			//If one at least one f the elements exists, create the aas:administration element
			if(version != null || revision != null) {
				Element administrationRoot = document.createElement(ADMINISTRATION);
				if(version != null) {
					administrationRoot.appendChild(version);
				}
				if(revision != null) {
					administrationRoot.appendChild(revision);
				}
				root.appendChild(administrationRoot);
			}
		}	
	}
	
	private static RuntimeException createInvalidIdentifierException(Map<String, Object> xmlObject) {
		return new RuntimeException("Invalid XML of Identifiable. No valid identification is present. " + xmlObject.toString());
	}
}