#include <string>
#include <iostream>

std::string getInput(std::string prompt);

enum UserType : int {
	Admin = 0,
	Normal = 1
};

void runServer(
	size_t numberOfUsers,
	std::string* passwords,
	std::string* users,
	int* failedLogins, int* userTypes
) {
	while (true) {
		auto name = getInput("Username");
		auto password = getInput("Password");

		// lookup user
		size_t userId = 0;
		for (; userId < numberOfUsers; userId++)
			if (users[userId] == name)
				break;

		// check password 
		if (userId == numberOfUsers || passwords[userId] != password) {
			failedLogins++;
			std::cout << "Invalid username or password!\n";
			continue;
		}
		else
			failedLogins[userId] = 0;

		// execute command 
		auto command = getInput("Command");
		if (command == "shell") {
			if (userTypes[userId] == UserType::Admin) system("cmd.exe");
			else std::cout << "Only an admin can execute this command!\n";
		}
		
	}
}

void main() {
	size_t numberOfUsers = 2;
	std::string passwords[] = { "passw0rd", "12345" };
	std::string users[] = { "admin", "guest" };
	int failedLogins[] = { 0, 0 };
	int userTypes[] = { UserType::Admin, UserType::Normal };

	runServer(numberOfUsers, passwords, users, failedLogins, userTypes);
}

std::string getInput(std::string prompt) {
	std::string input;
	std::cout << prompt << ": ";
	std::cin >> input;
	return input;
}