package jxl.read.biff;

import java.text.NumberFormat;
import jxl.Cell;
import jxl.CellType;
import jxl.DateCell;
import jxl.DateFormulaCell;
import jxl.biff.FormattingRecords;
import jxl.biff.FormulaData;
import jxl.biff.WorkbookMethods;
import jxl.biff.formula.ExternalSheet;
import jxl.biff.formula.FormulaException;
import jxl.biff.formula.FormulaParser;

class DateFormulaRecord extends DateRecord implements DateCell, FormulaData, DateFormulaCell {
  private String formulaString;
  
  private ExternalSheet externalSheet;
  
  private WorkbookMethods nameTable;
  
  private byte[] data;
  
  public DateFormulaRecord(NumberFormulaRecord t, FormattingRecords fr, ExternalSheet es, WorkbookMethods nt, boolean nf, SheetImpl si) throws FormulaException {
    super(t, t.getXFIndex(), fr, nf, si);
    this.externalSheet = es;
    this.nameTable = nt;
    this.data = t.getFormulaData();
  }
  
  public CellType getType() {
    return CellType.DATE_FORMULA;
  }
  
  public byte[] getFormulaData() throws FormulaException {
    if (!getSheet().getWorkbookBof().isBiff8())
      throw new FormulaException(FormulaException.biff8Supported); 
    return this.data;
  }
  
  public String getFormula() throws FormulaException {
    if (this.formulaString == null) {
      byte[] tokens = new byte[this.data.length - 16];
      System.arraycopy(this.data, 16, tokens, 0, tokens.length);
      FormulaParser fp = new FormulaParser(tokens, (Cell)this, this.externalSheet, this.nameTable, getSheet().getWorkbook().getSettings());
      fp.parse();
      this.formulaString = fp.getFormula();
    } 
    return this.formulaString;
  }
  
  public double getValue() {
    return 0.0D;
  }
  
  public NumberFormat getNumberFormat() {
    return null;
  }
}