#include "Object.h"
#include <iostream>



/////////////////////////////////////////////////////////////////////////
// public constructor/destructor

Object::Object(const char* path)
{
	// open file
	fsMesh.open(path, std::ios::in | std::ios::binary);

	if (!fsMesh.is_open())
		throw std::invalid_argument(std::string("file not found: ") += path);

	// jump into msh2 todo: search for MSH2 if there is a shadowvolume
	fsMesh.seekg(8);
	char tempChunkName[5] = { 0 };
	fsMesh.read(reinterpret_cast<char*>(&tempChunkName[0]), sizeof(tempChunkName) - 1);

	if (strcmp(tempChunkName, "MSH2"))
		throw std::invalid_argument(std::string("corrupted file MSH2 expected instead of ") += tempChunkName);

	std::uint32_t tempSize;
	fsMesh.read(reinterpret_cast<char*>(&tempSize), sizeof(tempSize));

	// get all sub chunks from MSH2
	loadChunks(lChunkMsh2, fsMesh.tellg(), tempSize);

	// search for all MODL Chunks
	for (std::list<chunkHeader*>::iterator it = lChunkMsh2.begin(); it != lChunkMsh2.end(); it++)
	{
		if (!strcmp("MODL", (*it)->name))
		{
			std::list<chunkHeader*>* tempModlList = new std::list<chunkHeader*>;
			loadChunks(*tempModlList, (*it)->position, (*it)->size);
			lChunkModls.push_back(tempModlList);
		}
	}

	// close file
	fsMesh.close();
}

Object::~Object()
{
	//delete Chunk list;	
}



/////////////////////////////////////////////////////////////////////////
// private functions

void Object::loadChunks(std::list<chunkHeader*>& destination, std::streampos start, const std::uint32_t end)
{
	// jump to first chunk
	fsMesh.seekg(start);

	do
	{
		chunkHeader* tempHeader = new chunkHeader();

		fsMesh.read(reinterpret_cast<char*>(&tempHeader->name[0]), sizeof(tempHeader->name) - 1);
		fsMesh.read(reinterpret_cast<char*>(&tempHeader->size), sizeof(tempHeader->size));
		tempHeader->position = fsMesh.tellg();

		destination.push_back(tempHeader);

		fsMesh.seekg(tempHeader->size, std::ios_base::cur);

		// reached end
		if (fsMesh.tellg() - start == end)
			break;

		// error. Maybe the size information is corrupted
		if (!fsMesh.good())
		{
			std::cout << "WARNING: corrupted file. Trying to continue" << std::endl;
			fsMesh.clear();
			break;
		}

	} while (true);

	std::cout << "got all chunks, totaly found: " << destination.size() << std::endl;

}


/////////////////////////////////////////////////////////////////////////
// public getter



/////////////////////////////////////////////////////////////////////////
// public functions