#pragma once

#if _DEBUG

#include "../src/Lib/mt/mt.h"
#include <sstream>
#include <string>

class Mesh;

class ObjExporter
{
public:
	static void Export(mt::Mesh* mesh, const std::string& filePath);

	ObjExporter(mt::Mesh* mesh);
	void Export(const std::string& filePath);
	void WriteFaceGroups(std::ostringstream& builder, std::ostringstream& mtlBuilder);
	void WriteFaces(std::ostringstream& builder, const mt::FaceList& faces);
	void WritePositions(std::ostringstream& builder);
	void WriteNormals(std::ostringstream& builder);
	void WriteUVs(std::ostringstream& builder);

private:
	std::string replace(const std::string &input, const std::string &search, const std::string &replace)
	{
		auto s = input;
		for (size_t pos = 0;; pos += replace.length())
		{
			// Locate the substring to replace
			pos = s.find(search, pos);
			if (pos == std::string::npos) break;
			// Replace by erasing and inserting
			s.erase(pos, search.length());
			s.insert(pos, replace);
		}

		return s;
	}
private:
	mt::Mesh* mesh;
};

#endif