#include "stdafx.h"
#include "GetRandom.h"
#include <shlwapi.h>
#pragma comment(lib,"Shlwapi.lib") //如果没有这行，会出现link错误

STRUCTRANDOMALL GetRandom::RandomData1;
CFile			GetRandom::gFile;			//文件句柄
BOOL			GetRandom::bRun = FALSE;			//运行

GetRandom::GetRandom()
{
}

//获取随机数
DWORD GetRandom::GetRandomValue()
{
	DWORD dRet = 0;

	//左边
	if (RandomData1.bPlay >= 90 * 10000 - 1)
	{
		//重新生成
		CreateAllRandomValue();

		//更新到备份数据； 把此数据重新生成。 记录更新日志。
		dRet = RandomData1.stData[RandomData1.bPlay].dwRandom;
		RandomData1.bPlay++;
	}
	else
	{
		dRet = RandomData1.stData[RandomData1.bPlay].dwRandom;
		RandomData1.bPlay++;
	}

	return dRet;
}

GetRandom::~GetRandom()
{
}

//重新生成随机数
bool GetRandom::CreateAllRandomValue()
{
	DWORD dTime = GetTickCount();
	ZeroMemory(&RandomData1, sizeof(STRUCTRANDOMALL));
	
	STRUCTRANDOMALL *p = new STRUCTRANDOMALL();
	if (!p) return false;
	ZeroMemory(p, sizeof(STRUCTRANDOMALL));

	for (int i = 100000; i < 100 * 10000;i++)
	{
		RandomData1.stData[i - 100000].dwRandom = i;
	}

	//随机种子
	srand(GetTickCount());

	int cbMaxCount = 90*10000;

	//混乱扑克
	int cbRandCount = 0, cbPosition = 0;
	do
	{
		cbPosition = (rand() % 90 * 10000 + rand() % 10000) % (cbMaxCount - cbRandCount);
		p->stData[cbRandCount++].dwRandom = RandomData1.stData[cbPosition].dwRandom;
		RandomData1.stData[cbPosition].dwRandom = RandomData1.stData[cbMaxCount - cbRandCount].dwRandom;
	} while (cbRandCount<cbMaxCount);

	CopyMemory(&RandomData1, p, sizeof(STRUCTRANDOMALL));

	if (p) delete p;
	return true;
}

//加载
bool GetRandom::Load()
{
	CFileFind fFind;
	
	if (!PathFileExists(L"RANDOM.D"))
	{
		//如果没有 则创建
		bRun = gFile.Open(L"RANDOM.D", CFile::modeCreate | CFile::modeReadWrite | CFile::typeBinary);

		if (!bRun)
		{
			//不成功
			CString str;
			str.Format(TEXT("创建随机文件失败。"));
			CTraceService::TraceString(str, TraceLevel_Normal);
			return false;
		}
		else
		{
			CreateAllRandomValue();
			gFile.Write(&RandomData1, sizeof(RandomData1));
		}

		//CString str = TEXT("创建随机文件成功。");
		//CTraceService::TraceString(str, TraceLevel_Normal);
	}
	else
	{
		//有则读取
		bRun = gFile.Open(L"RANDOM.D", CFile::modeReadWrite | CFile::typeBinary);

		if (!bRun)
		{
			//不成功
			CString str;
			str.Format(TEXT("打开随机文件失败。"));
			CTraceService::TraceString(str, TraceLevel_Normal);
			return false;
		}
		else
		{
			int iRet = gFile.Read((void*)&RandomData1, sizeof(RandomData1));
			if (iRet <= 0)
			{
				CString str;
				str.Format(TEXT("读取随机文件失败。"));
				CTraceService::TraceString(str, TraceLevel_Normal);
				return false;
			}
		}
	}
	return true;
}

//保存
bool GetRandom::End()
{
	if (bRun)
	{
		gFile.SeekToBegin();
		gFile.Write(&RandomData1, sizeof(RandomData1));
		gFile.Close();
		bRun = false;
	}
	return true;
}