#include <Windows.h>
#include <cstdio>
#include <iostream>
#include <memory>
#include <vector>

#include <PDF/PDFNet.h>
#include <PDF/PDFDoc.h>
#include <PDF/PDFDraw.h>
#include <PDF/ElementBuilder.h>
#include <PDF/ElementWriter.h>
#include <PDF/ElementReader.h>
#include <PDF/Image.h>
#include <Filters/StdFile.h>
#include <Filters/FilterReader.h>
#include <SDF/ObjSet.h>

using namespace std;
using namespace trn;
using namespace Common;
using namespace SDF;
using namespace PDF;

void ProcessElements(ElementReader& reader);
void ProcessText(ElementReader& reader);

void ProcessText(ElementReader& reader)
{
	Element* element;
	for (element = reader.Next(); element; element = reader.Next()) 	// Read page contents
	{
		switch (element->GetType()) {
		case Element::e_text_end:
			return;
		case Element::e_text: {
			GState* gs = element->GetGState();
			Font font = gs->GetFont();
			if (font.GetType() == Font::e_Type3) {
				CharIterator itrEnd = element->CharEnd();
				for (CharIterator itr = element->CharBegin(); itr != itrEnd; ++itr) {
					CharData charData = *itr;
					Obj* type3GlyphStream = font.GetType3GlyphStream(charData.char_code);
					if (type3GlyphStream) {
						ElementReader er;
						er.Begin(type3GlyphStream, );
						Element* el;
						cout << "Iterating...";
						for (el = er.Next(); el; el = er.Next()) {
							// fails while iterating
						}
						cout << "done.\n";
						er.End();
					}
					reader.Type3FontBegin(*itr);
					ProcessElements(reader);
					reader.End();
				}
			}
							  }
							  break;
		}
	}
}

void ProcessElements(ElementReader& reader)
{
	Element* element;
	for (element = reader.Next(); element; element = reader.Next()) 	// Read page contents
	{
		switch (element->GetType())
		{
		case Element::e_text_begin:
			{
				ProcessText(reader);
			}
			break;
		case Element::e_form:
			{
				reader.FormBegin(); 
				ProcessElements(reader);
				reader.End(); 
			}
			break; 
		}
	}
}

int main(int argc, char *argv[])
{
	PDFNet::Initialize();
	try {
		vector<char> buffer;
		{
			FILE* fp = 0;
			fopen_s(&fp, "c:\\1.pdf", "rb");
			if (fp != 0) {
				fseek(fp, 0, SEEK_END);
				size_t fpSize = ftell(fp);
				buffer.resize(fpSize);
				fseek(fp, 0, SEEK_SET);
				fread(&(buffer[0]), sizeof (char), buffer.size(), fp);
				fclose(fp);
			}
		}
		PDFDoc doc((const char*) &(buffer[0]), buffer.size());
		int pageCount = doc.GetPageCount();
		for (int i = 1; i <= pageCount; ++i) {
			Page page = doc.GetPage(i);
			ElementReader er;
			er.Begin(page);
			ProcessElements(er);
			er.End();
		}
	}
	catch (Exception& e) {
		cerr << e << "\n";
	}
	catch (exception& e) {
		cerr << e.what() << "\n";
	}
	catch (...) {
		cerr << "Unknown error!\n";
	}
	PDFNet::Terminate();
	return 0;
}