package org.apache.jackrabbit.webdav;

/*
 * 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.
 */

import org.apache.jackrabbit.webdav.property.DavPropertyNameSet;
import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.apache.jackrabbit.webdav.xml.ElementIterator;
import org.apache.jackrabbit.webdav.xml.XmlSerializable;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import java.util.Map;
import java.util.LinkedHashMap;

/**
 * MultiStatus representing the content of a multistatus response body and
 * allows to retrieve the Xml representation.
 */
public class MultiStatus
    implements DavConstants, XmlSerializable
{

    /**
     * Map collecting the responses for this multistatus, where every href must
     * only occur one single time.
     */
    private Map<String, MultiStatusResponse> responses = new LinkedHashMap<String, MultiStatusResponse>();

    /**
     * A general response description at the multistatus top level is used to
     * provide a general message describing the overarching nature of the response.
     * If this value is available an application may use it instead of
     * presenting the individual response descriptions contained within the
     * responses.
     */
    private String responseDescription;

    /**
     * Add response(s) to this multistatus, in order to build a multistatus for
     * responding to a PROPFIND request.
     *
     * @param resource The resource to add property from
     * @param propNameSet The requested property names of the PROPFIND request
     * @param propFindType
     * @param depth
     */
    public void addResourceProperties( DavResource resource, DavPropertyNameSet propNameSet, int propFindType,
                                       int depth )
    {
        addResponse( new MultiStatusResponse( resource, propNameSet, propFindType ) );
        if ( depth > 0 && resource.isCollection() )
        {
            DavResourceIterator iter = resource.getMembers();
            while ( iter.hasNext() )
            {
                addResourceProperties( iter.nextResource(), propNameSet, propFindType, depth - 1 );
            }
        }
    }

    /**
     * Add response(s) to this multistatus, in order to build a multistatus e.g.
     * in order to respond to a PROPFIND request. Please note, that in terms
     * of PROPFIND, this method would correspond to a
     * {@link DavConstants#PROPFIND_BY_PROPERTY} propfind type.
     *
     * @param resource The resource to add property from
     * @param propNameSet The requested property names of the PROPFIND request
     * @param depth
     * @see #addResourceProperties(DavResource, DavPropertyNameSet, int, int) for
     * the corresponding method that allows to specify the type explicitly.
     */
    public void addResourceProperties( DavResource resource, DavPropertyNameSet propNameSet, int depth )
    {
        addResourceProperties( resource, propNameSet, PROPFIND_BY_PROPERTY, depth );
    }

    /**
     * Add response(s) to this multistatus, in order to build a multistatus
     * as returned for COPY, MOVE, LOCK or DELETE requests resulting in an error
     * with a resource other than the resource identified in the Request-URI.
     *
     * @param resource
     * @param status
     * @param depth
     */
    public void addResourceStatus( DavResource resource, int status, int depth )
    {
        addResponse( new MultiStatusResponse( resource.getHref(), status ) );
        if ( depth > 0 && resource.isCollection() )
        {
            DavResourceIterator iter = resource.getMembers();
            while ( iter.hasNext() )
            {
                addResourceStatus( iter.nextResource(), status, depth - 1 );
            }
        }
    }

    /**
     * Add a <code>MultiStatusResponse</code> element to this <code>MultiStatus</code>
     *
     * @param response
     */
    public void addResponse( MultiStatusResponse response )
    {
        responses.put( response.getHref(), response );
    }

    /**
     * Returns the multistatus responses present as array.
     *
     * @return array of all {@link MultiStatusResponse responses} present in this
     * multistatus.
     */
    public MultiStatusResponse[] getResponses()
    {
        return (MultiStatusResponse[]) responses.values().toArray( new MultiStatusResponse[responses.size()] );
    }

    /**
     * Set the response description.
     *
     * @param responseDescription
     */
    public void setResponseDescription( String responseDescription )
    {
        this.responseDescription = responseDescription;
    }

    /**
     * Returns the response description.
     *
     * @return responseDescription
     */
    public String getResponseDescription()
    {
        return responseDescription;
    }

    /**
     * Return the Xml representation of this <code>MultiStatus</code>.
     *
     * @return Xml document
     * @param document
     */
    public Element toXml( Document document )
    {
        Element multistatus = DomUtil.createElement( document, XML_MULTISTATUS, NAMESPACE );
        for ( MultiStatusResponse response :  responses.values() )
        {
            multistatus.appendChild( response.toXml( document ) );
        }
        if ( responseDescription != null )
        {
            Element respDesc =
                DomUtil.createElement( document, XML_RESPONSEDESCRIPTION, NAMESPACE, responseDescription );
            multistatus.appendChild( respDesc );
        }
        return multistatus;
    }

    /**
     * Build a <code>MultiStatus</code> from the specified xml element.
     *
     * @param multistatusElement
     * @return new <code>MultiStatus</code> instance.
     * @throws IllegalArgumentException if the given document is <code>null</code>
     * or does not provide the required element.
     */
    public static MultiStatus createFromXml( Element multistatusElement )
    {
        if ( !DomUtil.matches( multistatusElement, XML_MULTISTATUS, NAMESPACE ) )
        {
            throw new IllegalArgumentException( "DAV:multistatus element expected." );
        }

        MultiStatus multistatus = new MultiStatus();

        ElementIterator it = DomUtil.getChildren( multistatusElement, XML_RESPONSE, NAMESPACE );
        while ( it.hasNext() )
        {
            Element respElem = it.nextElement();
            MultiStatusResponse response = MultiStatusResponse.createFromXml( respElem );
            multistatus.addResponse( response );
        }

        // optional response description on the multistatus element
        multistatus.setResponseDescription( DomUtil.getChildText( multistatusElement, XML_RESPONSEDESCRIPTION,
                                                                  NAMESPACE ) );
        return multistatus;
    }
}