#pragma once

namespace NPK
{

//------------------------------------
//pre-dfine 
//------------------------------------
class INPKFile;
class IFileStream;

//------------------------------------
// NPK file error codes
//------------------------------------
enum ErrorCode
{
	NPK_ERR_SUCCESS = 0,

	NPK_ERR_FILE_NOT_FOUND,
	NPK_ERR_INVALID_FILE_FORMAT,
	NPK_ERR_INVALID_FILE_HASH,
	NPK_ERR_FILE_ACCESS,
	NPK_ERR_FILE_READ,
	NPK_ERR_FILE_WRITE,
	NPK_ERR_PARAM,
	NPK_ERR_INVALID_STATE,

	//Other errors
	NPK_ERR_UNKNOWN
};

//------------------------------------
//API for NPK file
//------------------------------------

// Create a NPK file interface
INPKFile* createNPKFile();

// destroy an NPK interface
void closeNPKFile(INPKFile* npkFile);

// Get the last error code
ErrorCode getLastErrorCode();

// Get the last error message
const char* getLastErrorMessage();

//------------------------------------
// define the NPK file interface
//------------------------------------
class INPKFile
{
public:
	struct FileNode
	{
		std::string fileName;
		uint32_t fileOffset = 0;
		uint32_t fileSize = 0;
	};
public:
	virtual bool openPakFile(const char* szPackFileName) = 0;

	virtual bool closePakFile(void) = 0;

	virtual int32_t getFileCount(void) const = 0;

	virtual bool getFileNode(int32_t index, FileNode& fileNode) const = 0;

	virtual IFileStream* openFileStream(const char* szFileName) = 0;

	virtual void closeFileStream(IFileStream* fileStream) = 0;
};

class IFileStream
{
public:
	virtual const char* name(void) const = 0;
	virtual uint32_t size(void) const = 0;
	virtual uint32_t read(void* buffer, uint32_t size) = 0;
	virtual bool seek(uint32_t offset) = 0;
	virtual uint32_t tell(void) const = 0;
	virtual uint32_t crc32(void) = 0;
	virtual bool isEOF(void) const = 0;
};

}