/* ====================================================================
   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.
==================================================================== */
package org.apache.poi;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.HashMap;

import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.opc.*;
import org.apache.poi.openxml4j.opc.internal.PackagePropertiesPart;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlOptions;
import org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument;

/**
 * Wrapper around the two different kinds of OOXML properties 
 *  a document can have
 */
public class POIXMLProperties {
	private OPCPackage pkg;
	private CoreProperties core;
	private ExtendedProperties ext;
	private CustomProperties cust;

    private PackagePart extPart;
    private PackagePart custPart;


    private static final org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument NEW_EXT_INSTANCE;
    private static final org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument NEW_CUST_INSTANCE;
    static {
        NEW_EXT_INSTANCE = org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument.Factory.newInstance();
        NEW_EXT_INSTANCE.addNewProperties();

        NEW_CUST_INSTANCE = org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument.Factory.newInstance();
        NEW_CUST_INSTANCE.addNewProperties();
    }

    public POIXMLProperties(OPCPackage docPackage) throws IOException, OpenXML4JException, XmlException {
		this.pkg = docPackage;
		
		// Core properties
        core = new CoreProperties((PackagePropertiesPart)pkg.getPackageProperties() );
		
		// Extended properties
		PackageRelationshipCollection extRel =
			pkg.getRelationshipsByType(POIXMLDocument.EXTENDED_PROPERTIES_REL_TYPE);
		if(extRel.size() == 1) {
            extPart = pkg.getPart( extRel.getRelationship(0));
            org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument props = org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument.Factory.parse(
        		 extPart.getInputStream()
			);
			ext = new ExtendedProperties(props);
		} else {
            extPart = null;
            ext = new ExtendedProperties((org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument)NEW_EXT_INSTANCE.copy());
        }
		
		// Custom properties
		PackageRelationshipCollection custRel =
			pkg.getRelationshipsByType(POIXMLDocument.CUSTOM_PROPERTIES_REL_TYPE);
		if(custRel.size() == 1) {
            custPart = pkg.getPart( custRel.getRelationship(0));
            org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument props = org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument.Factory.parse(
					custPart.getInputStream()
			);
			cust = new CustomProperties(props);
		} else {
            custPart = null;
            cust = new CustomProperties((org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument)NEW_CUST_INSTANCE.copy());
		}
	}
	
	/**
	 * Returns the core document properties
	 */
	public CoreProperties getCoreProperties() {
		return core;
	}
	
	/**
	 * Returns the extended document properties
	 */
	public ExtendedProperties getExtendedProperties() {
		return ext;
	}
	
	/**
	 * Returns the custom document properties
	 */
	public CustomProperties getCustomProperties() {
		return cust;
	}
	
	/**
	 * Commit changes to the underlying OPC package
	 */
	public void commit() throws IOException{

        if(extPart == null && !NEW_EXT_INSTANCE.toString().equals(ext.props.toString())){
            try {
                PackagePartName prtname = PackagingURIHelper.createPartName("/docProps/app.xml");
                pkg.addRelationship(prtname, TargetMode.INTERNAL, "http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties");
                extPart = pkg.createPart(prtname, "application/vnd.openxmlformats-officedocument.extended-properties+xml");
            } catch (InvalidFormatException e){
                throw new POIXMLException(e);
            }
        }
        if(custPart == null && !NEW_CUST_INSTANCE.toString().equals(cust.props.toString())){
            try {
                PackagePartName prtname = PackagingURIHelper.createPartName("/docProps/custom.xml");
                pkg.addRelationship(prtname, TargetMode.INTERNAL, "http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties");
                custPart = pkg.createPart(prtname, "application/vnd.openxmlformats-officedocument.custom-properties+xml");
            } catch (InvalidFormatException e){
                throw new POIXMLException(e);
            }
        }
        if(extPart != null){
            XmlOptions xmlOptions = new XmlOptions(POIXMLDocumentPart.DEFAULT_XML_OPTIONS);

            Map<String, String> map = new HashMap<String, String>();
            map.put("http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes", "vt");
            xmlOptions.setSaveSuggestedPrefixes(map);

            OutputStream out = extPart.getOutputStream();
            ext.props.save(out, xmlOptions);
            out.close();
        }
        if(custPart != null){
            OutputStream out = custPart.getOutputStream();
            cust.props.save(out, POIXMLDocumentPart.DEFAULT_XML_OPTIONS);
            out.close();
        }
	}
	
	/**
	 * The core document properties
	 */
	public class CoreProperties {
		private PackagePropertiesPart part;
		private CoreProperties(PackagePropertiesPart part) {
			this.part = part;
		}
		
		public void setTitle(String title) {
			part.setTitleProperty(title);
		}
		public String getTitle() {
			return part.getTitleProperty().getValue();
		}
		
		public PackagePropertiesPart getUnderlyingProperties() {
			return part;
		}
	}
	
	/**
	 * Extended document properties
	 */
	public class ExtendedProperties {
		private org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument props;
		private ExtendedProperties(org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.PropertiesDocument props) {
			this.props = props;
		}
		
		public org.openxmlformats.schemas.officeDocument.x2006.extendedProperties.CTProperties getUnderlyingProperties() {
			return props.getProperties();
		}
	}
	
	/**
	 * Custom document properties
	 */
	public class CustomProperties {
		private org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument props;
		private CustomProperties(org.openxmlformats.schemas.officeDocument.x2006.customProperties.PropertiesDocument props) {
			this.props = props;
		}
		
		public org.openxmlformats.schemas.officeDocument.x2006.customProperties.CTProperties getUnderlyingProperties() {
			return props.getProperties();
		}
	}
}