/* ====================================================================
   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.formula;

import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.BitField;
import org.apache.poi.util.BitFieldFactory;

import org.apache.poi.hssf.util.CellReference;
import org.apache.poi.hssf.model.Workbook;
import org.apache.poi.hssf.record.RecordInputStream;

/**
 * ReferencePtg - handles references (such as A1, A2, IA4)
 * @author  Andrew C. Oliver (acoliver@apache.org)
 * @author Jason Height (jheight at chariot dot net dot au)
 */

public class ReferencePtg extends Ptg
{
    private final static int SIZE = 5;
    public final static byte sid  = 0x24;
    //public final static byte sid = 0x44;
    private short            field_1_row;
    private short            field_2_col;
    private BitField         rowRelative = BitFieldFactory.getInstance(0x8000);
    private BitField         colRelative = BitFieldFactory.getInstance(0x4000);
    private BitField         column      = BitFieldFactory.getInstance(0x3FFF);

    protected ReferencePtg() {
      //Required for clone methods
    }
    
    /**
     * Takes in a String represnetation of a cell reference and fills out the 
     * numeric fields.
     */
    public ReferencePtg(String cellref) {
        CellReference c= new CellReference(cellref);
        setRow((short) c.getRow());
        setColumn((short) c.getCol());
        setColRelative(!c.isColAbsolute());
        setRowRelative(!c.isRowAbsolute());
    }
    
    public ReferencePtg(short row, short column, boolean isRowRelative, boolean isColumnRelative) {
      setRow(row);
      setColumn(column);
      setRowRelative(isRowRelative);
      setColRelative(isColumnRelative);
    }    

    /** Creates new ValueReferencePtg */

    public ReferencePtg(RecordInputStream in)
    {
        field_1_row = in.readShort();
        field_2_col = in.readShort();
    }
    
    public String getRefPtgName() {
      return "ReferencePtg";
    }    

    public String toString()
    {
        StringBuffer buffer = new StringBuffer("[");
        buffer.append(getRefPtgName());
        buffer.append("]\n");

        buffer.append("row = ").append(getRow()).append("\n");
        buffer.append("col = ").append(getColumn()).append("\n");
        buffer.append("rowrelative = ").append(isRowRelative()).append("\n");
        buffer.append("colrelative = ").append(isColRelative()).append("\n");
        return buffer.toString();
    }

    public void writeBytes(byte [] array, int offset)
    {
        array[offset] = (byte) (sid + ptgClass);
        LittleEndian.putShort(array,offset+1,field_1_row);
        LittleEndian.putShort(array,offset+3,field_2_col);
    }

    public void setRow(short row)
    {
        field_1_row = row;
    }

    public short getRow()
    {
        return field_1_row;
    }

    public boolean isRowRelative()
    {
        return rowRelative.isSet(field_2_col);
    }
    
    public void setRowRelative(boolean rel) {
        field_2_col=rowRelative.setShortBoolean(field_2_col,rel);
    }
    
    public boolean isColRelative()
    {
        return colRelative.isSet(field_2_col);
    }
    
    public void setColRelative(boolean rel) {
        field_2_col=colRelative.setShortBoolean(field_2_col,rel);
    }

    public void setColumnRaw(short col)
    {
        field_2_col = col;
    }

    public short getColumnRaw()
    {
        return field_2_col;
    }

    public void setColumn(short col)
    {
    	field_2_col = column.setShortValue(field_2_col, col);
    }

    public short getColumn()
    {
    	return column.getShortValue(field_2_col);
    }

    public int getSize()
    {
        return SIZE;
    }

    public String toFormulaString(Workbook book)
    {
        //TODO -- should we store a cellreference instance in this ptg?? but .. memory is an issue, i believe!
        return (new CellReference(getRow(),getColumn(),!isRowRelative(),!isColRelative())).toString();
    }
    
    public byte getDefaultOperandClass() {
        return Ptg.CLASS_REF;
    }
    
    public Object clone() {
      ReferencePtg ptg = new ReferencePtg();
      ptg.field_1_row = field_1_row;
      ptg.field_2_col = field_2_col;
      ptg.setClass(ptgClass);
      return ptg;
    }
}