/*
* 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.hslf.record;

import org.apache.poi.ddf.*;
import org.apache.poi.util.LittleEndian;

import java.io.OutputStream;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.util.List;
import java.util.Iterator;

/**
 * Container records which always exists inside Document.
 * It always acts as a holder for escher DGG container
 *  which may contain which Escher BStore container information 
 *  about pictures containes in the presentation (if any).
 * 
 * @author Yegor Kozlov
 */
public class PPDrawingGroup extends RecordAtom {

    private byte[] _header;
    private EscherContainerRecord dggContainer;

    protected PPDrawingGroup(byte[] source, int start, int len) {
        // Get the header
        _header = new byte[8];
        System.arraycopy(source,start,_header,0,8);

        // Get the contents for now
        byte[] contents = new byte[len];
        System.arraycopy(source,start,contents,0,len);

        DefaultEscherRecordFactory erf = new DefaultEscherRecordFactory();
        EscherRecord child = erf.createRecord(contents, 0);
        child.fillFields( contents, 0, erf );
        dggContainer = (EscherContainerRecord)child.getChild(0);
    }

    /**
     * We are type 1035
     */
    public long getRecordType() {
        return RecordTypes.PPDrawingGroup.typeID;
    }

    /**
     * We're pretending to be an atom, so return null
     */
    public Record[] getChildRecords() {
        return null;
    }

    public void writeOut(OutputStream out) throws IOException {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        List child = dggContainer.getChildRecords();
        for (int i = 0; i < child.size(); i++) {
            EscherRecord r = (EscherRecord)child.get(i);
            if (r.getRecordId() == EscherContainerRecord.BSTORE_CONTAINER){
                EscherContainerRecord bstore = (EscherContainerRecord)r;

                ByteArrayOutputStream b2 = new ByteArrayOutputStream();
                List blip = bstore.getChildRecords();
                for (Iterator it=blip.iterator(); it.hasNext();) {
                    EscherBSERecord bse = (EscherBSERecord)it.next();
                    byte[] b = new byte[36+8];
                    bse.serialize(0, b);
                    b2.write(b);
                }
                byte[] bstorehead = new byte[8];
                LittleEndian.putShort(bstorehead, 0, bstore.getOptions());
                LittleEndian.putShort(bstorehead, 2, bstore.getRecordId());
                LittleEndian.putInt(bstorehead, 4, b2.size());
                bout.write(bstorehead);
                bout.write(b2.toByteArray());

            } else {
                bout.write(r.serialize());
            }
        }
        int size = bout.size();

        // Update the size (header bytes 5-8)
        LittleEndian.putInt(_header,4,size+8);

        // Write out our header
        out.write(_header);

        byte[] dgghead = new byte[8];
        LittleEndian.putShort(dgghead, 0, dggContainer.getOptions());
        LittleEndian.putShort(dgghead, 2, dggContainer.getRecordId());
        LittleEndian.putInt(dgghead, 4, size);
        out.write(dgghead);

        // Finally, write out the children
        out.write(bout.toByteArray());

    }

    public EscherContainerRecord getDggContainer(){
        return dggContainer;
    }
}