/* ====================================================================
   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.hssf.record.pivottable;

import org.apache.poi.hssf.record.RecordInputStream;
import org.apache.poi.hssf.record.StandardRecord;
import org.apache.poi.util.HexDump;
import org.apache.poi.util.LittleEndianOutput;
import org.apache.poi.util.RecordFormatException;
import org.apache.poi.util.StringUtil;

/**
 * SXVDEX - Extended PivotTable View Fields (0x0100)<br>
 * 
 * @author Patrick Cheng
 */
public final class ExtendedPivotTableViewFieldsRecord extends StandardRecord {
	public static final short sid = 0x0100;

	/** the value of the subname length when the {@link #_subtotalName} is not present */
	private static final int STRING_NOT_PRESENT_LEN = 0xFFFF;

	private int _grbit1;
	private int _grbit2;
	private int _citmShow;
	private int _isxdiSort;
	private int _isxdiShow;
	private int _reserved1;
	private int _reserved2;
	/** custom sub-total name */
	private String _subtotalName;

	public ExtendedPivotTableViewFieldsRecord(RecordInputStream in) {

		_grbit1 = in.readInt();
		_grbit2 = in.readUByte();
		_citmShow = in.readUByte();
		_isxdiSort = in.readUShort();
		_isxdiShow = in.readUShort();
		// This record seems to have different valid encodings
		switch (in.remaining()) {
			case 0:
				// as per "Microsoft Excel Developer's Kit" book
				// older version of SXVDEX - doesn't seem to have a sub-total name
				_reserved1 = 0;
				_reserved2 = 0;
				_subtotalName = null;
				return;
			case 10:
				// as per "MICROSOFT OFFICE EXCEL 97-2007 BINARY FILE FORMAT SPECIFICATION" pdf
				break;
			default:
				throw new RecordFormatException("Unexpected remaining size (" + in.remaining() + ")");
		}
		int cchSubName = in.readUShort();
		_reserved1 = in.readInt();
		_reserved2 = in.readInt();
		if (cchSubName != STRING_NOT_PRESENT_LEN) {
			_subtotalName = in.readUnicodeLEString(cchSubName);
		}
	}

	@Override
	protected void serialize(LittleEndianOutput out) {

		out.writeInt(_grbit1);
		out.writeByte(_grbit2);
		out.writeByte(_citmShow);
		out.writeShort(_isxdiSort);
		out.writeShort(_isxdiShow);

		if (_subtotalName == null) {
			out.writeShort(STRING_NOT_PRESENT_LEN);
		} else {
			out.writeShort(_subtotalName.length());
		}

		out.writeInt(_reserved1);
		out.writeInt(_reserved2);
		if (_subtotalName != null) {
			StringUtil.putUnicodeLE(_subtotalName, out);
		}
	}

	@Override
	protected int getDataSize() {
		
		return 4 + 1 + 1 + 2 + 2 + 2 +  4 + 4 +
					(_subtotalName == null ? 0 : (2*_subtotalName.length())); // in unicode
	}

	@Override
	public short getSid() {
		return sid;
	}

	@Override
	public String toString() {
		StringBuffer buffer = new StringBuffer();

		buffer.append("[SXVDEX]\n");

		buffer.append("    .grbit1 =").append(HexDump.intToHex(_grbit1)).append("\n");
		buffer.append("    .grbit2 =").append(HexDump.byteToHex(_grbit2)).append("\n");
		buffer.append("    .citmShow =").append(HexDump.byteToHex(_citmShow)).append("\n");
		buffer.append("    .isxdiSort =").append(HexDump.shortToHex(_isxdiSort)).append("\n");
		buffer.append("    .isxdiShow =").append(HexDump.shortToHex(_isxdiShow)).append("\n");
		buffer.append("    .subtotalName =").append(_subtotalName).append("\n");
		buffer.append("[/SXVDEX]\n");
		return buffer.toString();
	}
}
