using System.Collections.Generic;

using System.IO;

namespace Selenium.Pdf {

class PdfOutlines {

class PdfOutline {

public int Id;

public string Text;

public int Page;

public int Y;

}

private List<PdfOutline> _outlines = new List<PdfOutline>();

public int Count {

get {

return _outlines.Count;

}

}

public void Add(int id, string text, int page, int y) {

_outlines.Add(new PdfOutline {

Id = id,

Text = text,

Page = page,

Y = y

});

}

public void Write(StreamWriter writer, PdfXRefs xrefs) {

//Write the outlines entries

int count = _outlines.Count;

for (int i = 0; i < count; i++) {

PdfOutline outline = _outlines[i];

xrefs.RegisterObject(outline.Id);

writer.WriteLine(outline.Id + " 0 obj");

writer.WriteLine("<<");

writer.WriteLine("/Title (" + PdfWriter.EscapeText(outline.Text) + ")");

writer.WriteLine("/Parent " + PdfXRefs.ID_OUTLINES + " 0 R");

writer.Write("/Dest [ ");

writer.Write(outline.Page);

writer.Write(" 0 R /XYZ null ");

writer.Write(outline.Y == -1 ? "null" : outline.Y.ToString());

writer.WriteLine(" 0 ]");

if (i > 0)

writer.WriteLine("/Prev " + _outlines[i - 1].Id + " 0 R");

if (i < count - 1)

writer.WriteLine("/Next " + _outlines[i + 1].Id + " 0 R");

writer.WriteLine(">>");

writer.WriteLine("endobj");

}

//Write the main entry

xrefs.RegisterObject(PdfXRefs.ID_OUTLINES);

writer.WriteLine(PdfXRefs.ID_OUTLINES + " 0 obj");

writer.WriteLine("<<");

writer.WriteLine("/Type /Outlines");

if (_outlines.Count == 0) {

writer.WriteLine("/Count 0");

writer.WriteLine("/First null");

writer.WriteLine("/Last null");

} else {

writer.WriteLine("/Count " + count);

writer.WriteLine("/First " + _outlines[0].Id + " 0 R");

writer.WriteLine("/Last " + _outlines[count - 1].Id + " 0 R");

}

writer.WriteLine(">>");

writer.WriteLine("endobj");

}

}

}