#pragma once

#include "libNPK.h"
#include "libNPK_NPKFile.h"

namespace NPK
{

class CFileStream : public IFileStream
{
public:
	virtual const char* name(void) const {
		return m_fileName.c_str();
	}

	virtual uint32_t size(void) const {
		return m_fileSize;
	}

	virtual uint32_t read(void* buffer, uint32_t size);

	virtual bool seek(uint32_t offset);

	virtual uint32_t tell(void) const {
		return m_currentOffset;
	}

	virtual uint32_t crc32(void);

	virtual bool isEOF(void) const {
		return m_currentOffset >= m_fileSize;
	}

	virtual bool writeToDiskFile(const wchar_t* diskPathFile);

protected:
	//Pack file
	CNPKFile* m_pNPKFile;
	// windows file handle
	HANDLE m_hFileandle;
	std::string m_fileName;
	//offset of the file in the pak file
	const uint32_t m_fileOffset = 0;
	//size of the file
	const uint32_t m_fileSize = 0;
	//current read offset in the file
	uint32_t m_currentOffset = 0;
	//CRC32 checksum of the file
	uint32_t m_crc32 = 0;
	//Flag to indicate if CRC32 has been calculated
	bool m_crc32Calculated = false;

private:
	CFileStream(CNPKFile* pNPKFile, HANDLE hFile, const FileItemBaseInfo& baseFileInfo);
	virtual ~CFileStream();

	friend IFileStream* CNPKFile::openFileStream(const char* szFileName);
	friend void CNPKFile::closeFileStream(IFileStream* fileStream);
};

}