package jxl.demo;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import jxl.WorkbookSettings;
import jxl.biff.BaseCompoundFile;
import jxl.read.biff.BiffException;
import jxl.read.biff.CompoundFile;

class PropertySetsReader {
  private BufferedWriter writer;
  
  private CompoundFile compoundFile;
  
  public PropertySetsReader(File file, String propertySet, OutputStream os) throws IOException, BiffException {
    this.writer = new BufferedWriter(new OutputStreamWriter(os));
    FileInputStream fis = new FileInputStream(file);
    int initialFileSize = 1048576;
    int arrayGrowSize = 1048576;
    byte[] d = new byte[initialFileSize];
    int bytesRead = fis.read(d);
    int pos = bytesRead;
    while (bytesRead != -1) {
      if (pos >= d.length) {
        byte[] newArray = new byte[d.length + arrayGrowSize];
        System.arraycopy(d, 0, newArray, 0, d.length);
        d = newArray;
      } 
      bytesRead = fis.read(d, pos, d.length - pos);
      pos += bytesRead;
    } 
    bytesRead = pos + 1;
    this.compoundFile = new CompoundFile(d, new WorkbookSettings());
    fis.close();
    if (propertySet == null) {
      displaySets();
    } else {
      displayPropertySet(propertySet, os);
    } 
  }
  
  void displaySets() throws IOException {
    int numSets = this.compoundFile.getNumberOfPropertySets();
    for (int i = 0; i < numSets; i++) {
      BaseCompoundFile.PropertyStorage ps = this.compoundFile.getPropertySet(i);
      this.writer.write(Integer.toString(i));
      this.writer.write(") ");
      this.writer.write(ps.name);
      this.writer.write("(type ");
      this.writer.write(Integer.toString(ps.type));
      this.writer.write(" size ");
      this.writer.write(Integer.toString(ps.size));
      this.writer.write(" prev ");
      this.writer.write(Integer.toString(ps.previous));
      this.writer.write(" next ");
      this.writer.write(Integer.toString(ps.next));
      this.writer.write(" child ");
      this.writer.write(Integer.toString(ps.child));
      this.writer.write(" start block ");
      this.writer.write(Integer.toString(ps.startBlock));
      this.writer.write(")");
      this.writer.newLine();
    } 
    this.writer.flush();
    this.writer.close();
  }
  
  void displayPropertySet(String ps, OutputStream os) throws IOException, BiffException {
    if (ps.equalsIgnoreCase("SummaryInformation")) {
      ps = "\005SummaryInformation";
    } else if (ps.equalsIgnoreCase("DocumentSummaryInformation")) {
      ps = "\005DocumentSummaryInformation";
    } else if (ps.equalsIgnoreCase("CompObj")) {
      ps = "\001CompObj";
    } 
    byte[] stream = this.compoundFile.getStream(ps);
    os.write(stream);
  }
}