#include "HGDll.h"
#include "HGInc.h"
#include "HGInfo.h"
#if !defined(HG_CMP_MSC)
#include <dlfcn.h>
#endif

struct HGDllImpl
{
	HGDllImpl()
	{
		m_hDll = NULL;
	}

	~HGDllImpl()
	{
		if (NULL != m_hDll)
		{
#if !defined(HG_CMP_MSC)
			dlclose(m_hDll);
#else
			FreeLibrary(m_hDll);
#endif
			m_hDll = NULL;
		}
	}

#if !defined(HG_CMP_MSC)
	void* m_hDll;
#else
	HMODULE m_hDll;
#endif
};

HGResult HGAPI HGBase_CreateDll(const HGChar* fileName, HGDll* dll)
{
	if (NULL == fileName || NULL == dll)
	{
		return HGBASE_ERR_INVALIDARG;
	}

#if !defined(HG_CMP_MSC)
	void* hDll = dlopen(fileName, RTLD_LAZY);
	if (NULL == hDll)
	{
		HGBase_WriteInfo(HGBASE_INFOTYPE_ERROR, "HGBase_CreateDll: dlopen fail, %s dlerror=%s", fileName, dlerror());
		return HGBASE_ERR_LOADLIBRARY;
	}
#else
	HMODULE hDll = LoadLibraryExA((const char *)fileName, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
	if (NULL == hDll)
	{
		HGBase_WriteInfo(HGBASE_INFOTYPE_ERROR, "HGBase_CreateDll: LoadLibraryExA fail, %s GetLastError=%u", fileName, GetLastError());
		return HGBASE_ERR_LOADLIBRARY;
	}
#endif
	HGDllImpl* dllImpl = new HGDllImpl;
	dllImpl->m_hDll = hDll;
	*dll = (HGDll)dllImpl;
	return HGBASE_ERR_OK;
}

HGResult HGAPI HGBase_DestroyDll(HGDll dll)
{
	if (NULL == dll)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGDllImpl* dllImpl = (HGDllImpl*)dll;
	delete dllImpl;
	return HGBASE_ERR_OK;
}

HGResult HGAPI HGBase_GetDllProcAddress(HGDll dll, const HGChar* symbol, HGPointer* func)
{
	if (NULL == dll || NULL == symbol || NULL == func)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGDllImpl* dllImpl = (HGDllImpl*)dll;
#if !defined(HG_CMP_MSC)
	*func = dlsym(dllImpl->m_hDll, symbol);
#else
	* func = GetProcAddress(dllImpl->m_hDll, (const char *)symbol);
#endif
	if (NULL == *func)
	{
		return HGBASE_ERR_FAIL;
	}

	return HGBASE_ERR_OK;
}