#include "HGLog.h"
#include "HGInc.h"

struct HGLogImpl
{
	HGLogImpl()
	{
		m_file = NULL;
	}

	~HGLogImpl()
	{
		if (NULL != m_file)
		{
			fclose(m_file);
			m_file = NULL;
		}
	}

	FILE* m_file;
};

HGResult HGAPI HGBase_OpenLog(const HGChar* fileName, HGLog* log)
{
	if (NULL == fileName || NULL == log)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	FILE *file = fopen(fileName, "a+");
	if (NULL == file)
	{
		return HGBASE_ERR_ACCESSDENIED;
	}

	HGLogImpl* logImpl = new HGLogImpl;
	logImpl->m_file = file;
	*log = (HGLog)logImpl;
	return HGBASE_ERR_OK;
}

HGResult HGAPI HGBase_CloseLog(HGLog log)
{
	if (NULL == log)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGLogImpl* logImpl = (HGLogImpl*)log;
	delete logImpl;
	return HGBASE_ERR_OK;
}

HGResult HGAPI HGBase_GetLogFileSize(HGLog log, HGLonglong* size)
{
	if (NULL == log || NULL == size)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGLogImpl* logImpl = (HGLogImpl*)log;
#if defined(HG_CMP_MSC)
	_fseeki64(logImpl->m_file, 0, SEEK_END);
	*size = _ftelli64(logImpl->m_file);
#else
	fseeko64(logImpl->m_file, 0, SEEK_END);
	*size = ftello64(logImpl->m_file);
#endif
	return HGBASE_ERR_OK;
}

HGResult HGAPI HGBase_WriteLog(HGLog log, const HGChar* info)
{
	if (NULL == log || NULL == info || '\0' == *info)
	{
		return HGBASE_ERR_INVALIDARG;
	}

	HGLogImpl* logImpl = (HGLogImpl*)log;
#if defined(HG_CMP_MSC)
	_fseeki64(logImpl->m_file, 0, SEEK_END);
#else
	fseeko64(logImpl->m_file, 0, SEEK_END);
#endif
	fwrite(info, 1, strlen(info), logImpl->m_file);
    if (info[strlen(info) - 1] != '\n')
        fwrite("\n", 1, strlen("\n"), logImpl->m_file);
	fflush(logImpl->m_file);
	return HGBASE_ERR_OK;
}