#include <iostream>
#include <string>
#include <vector>
#include <windows.h>
#include <TlHelp32.h>

using namespace std;

DWORD GetProcessIdByName(const string&);
DWORD_PTR GetModule(const string&);

int main()
{
	DWORD pId
	{
		GetProcessIdByName("KillingFloor.exe")
	};

	HANDLE hProc
	{
		OpenProcess(PROCESS_ALL_ACCESS, FALSE, pId)
	};

	vector<string> strVec
	{
		"Nickname1", "Nickname2",
		"Nickname3", "Nickname4",
		"Nickname5", "Nickname6",
	};

	HWND hwnd
	{
		FindWindowA(NULL, "Killing Floor")
	};

	while(true)
	{
		for (const auto& i : strVec)
		{
			WriteProcessMemory
			(
				hProc,
				(LPVOID)(GetModule("steamclient.dll") + 0x681F50),
				i.c_str(),
				i.size(),
				NULL
			);

			SendMessage(hwnd, WM_KEYUP, 0x50, NULL);
			SendMessage(hwnd, WM_KEYDOWN, 0x50, NULL);

			Sleep(1000);
		}
	}

	CloseHandle(hProc);

	system("pause");
}

DWORD GetProcessIdByName(const string& processName)
{
	DWORD pid = 0;

	// Create toolhelp snapshot
	HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	PROCESSENTRY32 process;
	ZeroMemory(&process, sizeof(process));
	process.dwSize = sizeof(process);

	// Walkthrough all processes
	if (Process32First(snapshot, &process))
	{
		do
		{
			// Compare process.szExeFile based on format of name, i.e., trim file path
			// trim .exe if necessary, etc
			if (processName == static_cast<std::string>(process.szExeFile))
			{
				pid = process.th32ProcessID;
				break;
			}
		} while (Process32Next(snapshot, &process));
	}

	CloseHandle(snapshot);
	return pid;
}

DWORD_PTR GetModule(const string& lpModuleName)
{
	MODULEENTRY32 lpModuleEntry = { 0 };
	HANDLE hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE | TH32CS_SNAPMODULE32, GetProcessIdByName("KillingFloor.exe"));

	if (!hSnapShot)
		return NULL;
	lpModuleEntry.dwSize = sizeof(lpModuleEntry);
	BOOL bModule = Module32First(hSnapShot, &lpModuleEntry);
	while (bModule)
	{
		if (lpModuleName == static_cast<std::string>(lpModuleEntry.szModule))
		{
			CloseHandle(hSnapShot);
			return (DWORD_PTR)lpModuleEntry.modBaseAddr;
		}
		bModule = Module32Next(hSnapShot, &lpModuleEntry);
	}
	CloseHandle(hSnapShot);
	return NULL;
}