/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
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 *
 * 5. Products derived from this software may not be called "Apache",
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 *
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.poi.hssf.record;

import org.apache.poi.util.LittleEndian;

import java.util.ArrayList;

/**
 * Title:        Extern Sheet <P>
 * Description:  A List of Inndexes to SupBook <P>
 * REFERENCE:  <P>
 * @author Libin Roman (Vista Portal LDT. Developer)
 * @version 1.0-pre
 */

public class ExternSheetRecord extends Record {
    public final static short sid = 0x17;
    private short             field_1_number_of_REF_sturcutres;
    private ArrayList         field_2_REF_structures;
    
    public ExternSheetRecord() {
        field_2_REF_structures = new ArrayList();
    }
    
    /**
     * Constructs a Extern Sheet record and sets its fields appropriately.
     *
     * @param id     id must be 0x16 or an exception will be throw upon validation
     * @param size  the size of the data area of the record
     * @param data  data of the record (should not contain sid/len)
     */
    
    public ExternSheetRecord(short id, short size, byte[] data) {
        super(id, size, data);
    }
    
    /**
     * Constructs a Extern Sheet record and sets its fields appropriately.
     *
     * @param id     id must be 0x16 or an exception will be throw upon validation
     * @param size  the size of the data area of the record
     * @param data  data of the record (should not contain sid/len)
     * @param offset of the record's data
     */
    public ExternSheetRecord(short id, short size, byte[] data, int offset) {
        super(id, size, data, offset);
    }
    
    /**
     * called by constructor, should throw runtime exception in the event of a
     * record passed with a differing ID.
     *
     * @param id alleged id for this record
     */
    protected void validateSid(short id) {
        if (id != sid) {
            throw new RecordFormatException("NOT An ExternSheet RECORD");
        }
    }
    
    /**
     * called by the constructor, should set class level fields.  Should throw
     * runtime exception for bad/icomplete data.
     *
     * @param data raw data
     * @param size size of data
     * @param offset of the record's data (provided a big array of the file)
     */
    protected void fillFields(byte [] data, short size, int offset) {
        field_2_REF_structures           = new ArrayList();
        
        field_1_number_of_REF_sturcutres = LittleEndian.getShort(data, 0 + offset);
        
        int pos = 2 + offset;
        for (int i = 0 ; i < field_1_number_of_REF_sturcutres ; ++i) {
            ExternSheetSubRecord rec = new ExternSheetSubRecord((short)0, (short)6 , data , pos);
            
            pos += 6;
            
            field_2_REF_structures.add( rec);
        }
    }
    
    /** 
     * sets the number of the REF structors , that is in Excel file
     * @param numStruct number of REF structs
     */
    public void setNumOfREFStructures(short numStruct) {
        field_1_number_of_REF_sturcutres = numStruct;
    }
    
    /**  
     * return the number of the REF structors , that is in Excel file
     * @return number of REF structs
     */
    public short getNumOfREFStructures() {
        return field_1_number_of_REF_sturcutres;
    }
    
    /** 
     * adds REF struct (ExternSheetSubRecord)
     * @param rec REF struct
     */
    public void addREFRecord(ExternSheetSubRecord rec) {
        field_2_REF_structures.add(rec);
    }
    
    /** returns the number of REF Records, which is in model
     * @return number of REF records
     */
    public int getNumOfREFRecords() {
        return field_2_REF_structures.size();
    }
    
    /** returns the REF record (ExternSheetSubRecord)
     * @param elem index to place
     * @return REF record
     */
    public ExternSheetSubRecord getREFRecordAt(int elem) {
        ExternSheetSubRecord result = ( ExternSheetSubRecord ) field_2_REF_structures.get(elem);
        
        return result;
    }
    
    public String toString() {
        StringBuffer buffer = new StringBuffer();
        
        buffer.append("[EXTERNSHEET]\n");
        buffer.append("   numOfRefs     = ").append(getNumOfREFStructures()).append("\n");
        for (int k=0; k < this.getNumOfREFRecords(); k++) {
            buffer.append("refrec         #").append(k).append('\n');
            buffer.append(getREFRecordAt(k).toString());
            buffer.append("----refrec     #").append(k).append('\n');
        }
        buffer.append("[/EXTERNSHEET]\n");
        
        
        return buffer.toString();
    }
    
    /**
     * called by the class that is responsible for writing this sucker.
     * Subclasses should implement this so that their data is passed back in a
     * byte array.
     *
     * @param offset to begin writing at
     * @param data byte array containing instance data
     * @return number of bytes written
     */
    public int serialize(int offset, byte [] data) {
        LittleEndian.putShort(data, 0 + offset, sid);
        LittleEndian.putShort(data, 2 + offset,(short)(2 + (getNumOfREFRecords() *6)));
        
        LittleEndian.putShort(data, 4 + offset, getNumOfREFStructures());
        
        int pos = 6 ;
        
        for (int k = 0; k < getNumOfREFRecords(); k++) {
            ExternSheetSubRecord record = getREFRecordAt(k);
            System.arraycopy(record.serialize(), 0, data, pos + offset, 6);
            
            pos +=6;
        }
        return getRecordSize();
    }
    
    public int getRecordSize() {
        return 4 + 2 + getNumOfREFRecords() * 6;
    }
    
    /**
     * return the non static version of the id for this record.
     */
    public short getSid() {
        return this.sid;
    }
}