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/**
 * eobjects.org MetaModel
 * Copyright (C) 2010 eobjects.org
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */

package org.xBaseJ.indexes;

import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.util.Calendar;

import org.xBaseJ.DBF;
import org.xBaseJ.DbaseUtils;

/**
 * This class is courtesy of the xBaseJ project: http://xbasej.sourceforge.net/
 * 
 * Copyright 1997-2007 - American Coders, LTD - Raleigh NC USA
 * 
 *  * American Coders, Ltd
 * P. O. Box 97462
 * Raleigh, NC  27615  USA
 * 1-919-846-2014
 * http://www.americancoders.com
 * 
 * 
 * @author Joe McVerry, American Coders Ltd.
 */
public class MDXAnchor {

	static final short BLOCKLENGTH = 512;

	byte filetype; /* error if not MDXTYPE */
	byte lastreIndex[] = new byte[3]; /* last reIndex date */
	byte DBFname[] = new byte[16]; /* root name of associated .DBF */
	short blocksize; /* SET BLOCKSIZE value, minimum = 2 */
	short blockbytes; /* block size in bytes */
	byte production; /* 1 if production .MDX, else 0 */
	byte resrvd1[] = new byte[3];
	short indexes; /* number of indexes in the file */
	byte resrvd2[] = new byte[2];
	int nextAvailable; /* page number of end of file */
	int nextfreepage; /* page number of next free block */
	int freepages; /* pages in next free block */
	byte created[] = new byte[3]; /* file creation date */
	byte resrvd3;
	int something[] = new int[4];
	RandomAccessFile nfile;
	String knownName;

	public MDXAnchor(RandomAccessFile ifile) {
		nfile = ifile;
	}

	public void set(String Name) {

		filetype = 2;
		lastreIndex[0] = 0; // yyyy
		lastreIndex[1] = 0; // mm
		lastreIndex[2] = 0; // dd
		byte dname[];
		try {
			dname = Name.substring(0, Math.min(16, Name.length())).getBytes(
					DBF.encodedType);
		} catch (UnsupportedEncodingException UEE) {
			dname = Name.substring(0, Math.min(16, Name.length())).getBytes();
		}
		for (int x = 0; x < dname.length; x++)
			DBFname[x] = dname[x];
		production = 1;
		nextAvailable = 4;
		blocksize = 2;
		blockbytes = (short) (blocksize * BLOCKLENGTH);
		indexes = 0;
		resrvd1[0] = 48;
		resrvd1[1] = 32;
		resrvd2[1] = 27;
		created[0] = 0; // yyyy
		created[1] = 0; // mm
		created[2] = 0; // dd
		something[0] = 25;
		something[1] = 1;
		knownName = new String(Name);
	}

	public void reset(RandomAccessFile ifile) {
		nfile = ifile;
		filetype = 2;
		lastreIndex[0] = 0; // yyyy
		lastreIndex[1] = 0; // mm
		lastreIndex[2] = 0; // dd
		nextAvailable = 4;
		created[0] = 0; // yyyy
		created[1] = 0; // mm
		created[2] = 0; // dd
	}

	public void read() throws IOException {
		nfile.seek(0);
		filetype = nfile.readByte();
		nfile.read(lastreIndex);
		nfile.read(DBFname);
		blocksize = nfile.readShort();
		blockbytes = nfile.readShort();
		production = nfile.readByte();
		nfile.read(resrvd1);
		indexes = nfile.readShort();
		nfile.read(resrvd2);
		nextAvailable = nfile.readInt();
		nextfreepage = nfile.readInt();
		freepages = nfile.readInt();
		nfile.read(created);
		resrvd3 = nfile.readByte();
		something[0] = nfile.readInt();
		something[1] = nfile.readInt();
		something[2] = nfile.readInt();
		something[3] = nfile.readInt();
		redo_numbers();
	}

	public void write() throws IOException {
		redo_numbers();
		nfile.seek(0);
		nfile.writeByte(filetype);
		// 1.0Date d = new Date();
		// 1.0lastreIndex[0] = (byte) d.getYear();
		// 1.0lastreIndex[1] = (byte) (d.getMonth() + 1);
		// 1.0lastreIndex[2] = (byte) (d.getDay() + 1);

		Calendar d = Calendar.getInstance();
		lastreIndex[0] = (byte) (d.get(Calendar.YEAR) - 1900);
		lastreIndex[1] = (byte) (d.get(Calendar.MONTH) + 1);
		lastreIndex[2] = (byte) (d.get(Calendar.DAY_OF_MONTH));

		nfile.write(lastreIndex);
		nfile.write(DBFname);
		nfile.writeShort(blocksize);
		nfile.writeShort(blockbytes);
		nfile.writeByte(production);
		nfile.write(resrvd1);
		nfile.writeShort(indexes);
		nfile.write(resrvd2);
		nfile.writeInt(nextAvailable);
		nfile.writeInt(nextfreepage);
		nfile.writeInt(freepages);
		nfile.write(created);
		nfile.writeByte(resrvd3);
		nfile.writeInt(something[0]);
		nfile.writeInt(something[1]);
		nfile.writeInt(something[2]);
		nfile.writeInt(something[3]);
		redo_numbers();

	}

	public void redo_numbers() {
		blocksize = DbaseUtils.x86(blocksize);
		blockbytes = DbaseUtils.x86(blockbytes);
		indexes = DbaseUtils.x86(indexes);
		nextAvailable = DbaseUtils.x86(nextAvailable);
		nextfreepage = DbaseUtils.x86(nextfreepage);
		freepages = DbaseUtils.x86(freepages);
	}

	public int get_nextavailable() {
		return nextAvailable;
	}

	public void update_nextavailable() throws IOException {
		nextAvailable += blocksize;
		write();
	}

	public void reset_nextavailable() throws IOException {
		nextAvailable -= blocksize;
		write();
	}

	public int get_blocksize() {
		return blocksize;
	}

	public int get_blockbytes() {
		return blockbytes;
	}

	public static short getBLOCKLENGTH() {
		return BLOCKLENGTH;
	}

	public short getBlockbytes() {
		return blockbytes;
	}

	public short getBlocksize() {
		return blocksize;
	}

	public byte[] getCreated() {
		return created;
	}

	public byte[] getDBFname() {
		return DBFname;
	}

	public byte getFiletype() {
		return filetype;
	}

	public int getFreepages() {
		return freepages;
	}

	public void setIndexes(short ind) {
		indexes = ind;
	}

	public void addOneToIndexes() {
		indexes++;
	}

	public short getIndexes() {
		return indexes;
	}

	public String getKnownName() {
		return knownName;
	}

	public byte[] getLastreIndex() {
		return lastreIndex;
	}

	public int getnextAvailable() {
		return nextAvailable;
	}

	public int getNextfreepage() {
		return nextfreepage;
	}

	public RandomAccessFile getNfile() {
		return nfile;
	}

	public byte getProduction() {
		return production;
	}

}