#include "tier2/ifilesystem.h"
#include "tier1/interface.h"
#include "android/asset_manager.h"
#include "android/android_native_app_glue.h"

class CAndroidFileHandle : public IFileHandle
{
public:
	AAsset *m_pFile;
	size_t m_nSize;

};

class CAndroidDirectoryHandle: public IDirectoryHandle
{
public:
};

#include "android/log.h"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, "funnygame", __VA_ARGS__)
extern struct android_app *g_android_app;
class CAndroidFileSystem : public IFileSystem
{
public:
	virtual void Init() override {
	
	};
	virtual void Shutdown() override {};

	virtual IFileHandle *Open( const char *szFileName, int eOpCode ) override 
	{
		LOGI("Opening file: %s", szFileName);
		FILE *pFile;
		CAndroidFileHandle *pHandle = NULL;

		switch (eOpCode)
		{
		case FILEMODE_READ:
			break;
		default:
			return 0;
		}

		pHandle = new CAndroidFileHandle;
		pHandle->m_pFileSystem = this;
		pHandle->m_pFile = AAssetManager_open(g_android_app->activity->assetManager, szFileName, AASSET_MODE_RANDOM);
		LOGI("Opened file: %p", pHandle->m_pFile);
		pHandle->m_nSize = AAsset_getLength64(pHandle->m_pFile);
		return pHandle;
	}
	virtual size_t Write( IFileHandle *pFile, const void *pData, size_t nDataSize ) override
	{
	}
	virtual size_t Read( IFileHandle *pFile, void *pData, size_t nDataSize ) override
	{
		CAndroidFileHandle *pHandle = (CAndroidFileHandle*)pFile;
		if (!pHandle)
			return 0;
		return AAsset_read(pHandle->m_pFile, pData, nDataSize);
	}

	virtual size_t Seek( IFileHandle *pFile, ESeekMode eSeekMode, size_t nOffset ) override
	{
		CAndroidFileHandle *pHandle = (CAndroidFileHandle*)pFile;
		int eLibcSeekMode = 0;
		
		if (!pHandle)
			return 0;

		switch (eSeekMode) {
		case SEEKMODE_RELATIVE_CURRENT:
			eLibcSeekMode = SEEK_CUR;
			break;
		case SEEKMODE_RELATIVE_END:
			eLibcSeekMode = SEEK_END;
			break;
		case SEEKMODE_RELATIVE_START:
			eLibcSeekMode = SEEK_SET;
			break;
		}
		return AAsset_seek64(pHandle->m_pFile, nOffset, eLibcSeekMode);
	}

	virtual size_t Tell( IFileHandle *pFile ) override
	{
		CAndroidFileHandle *pHandle = (CAndroidFileHandle*)pFile;
		if (!pHandle)
			return 0;
		return AAsset_seek64(pHandle->m_pFile, 0, SEEK_CUR);
	}
	
	virtual size_t Size( IFileHandle *pFile ) override
	{
		CAndroidFileHandle *pHandle = (CAndroidFileHandle*)pFile;
		if (!pHandle)
			return 0;
		return pHandle->m_nSize;
	}



	virtual void Close( IFileHandle *pFile ) override
	{
		CAndroidFileHandle *pHandle = (CAndroidFileHandle*)pFile;
		if (!pHandle)
			return;
		AAsset_close(pHandle->m_pFile);
		delete pHandle;
	}

	virtual CUtlBuffer<unsigned char> Read( IFileHandle *pFile ) override { return {}; }; 
	virtual const char *ReadString( IFileHandle *pFile ) override {
		char *szData = NULL;
		size_t uSize = Size(pFile);

		szData = (char*)V_malloc(uSize+1);
		Read(pFile, szData,uSize);
		szData[uSize] = 0;

		return szData;
	};

	virtual size_t PrintF( IFileHandle *pFile, const char *szFormat, ... ) override 
	{
		return 0;
	}
	
	virtual IDirectoryHandle *OpenDir( const char *szDirName ) override
	{
		return NULL;

	};

	virtual void CloseDir( IDirectoryHandle *pDir ) override
	{
	};
};

EXPOSE_INTERFACE(CAndroidFileSystem, IFileSystem, FILESYSTEM_INTERFACE_VERSION)