#include<iostream>
#include<fstream>
#include<sstream>
#include<streambuf>
#include<cstdlib>
#include<string>
#include<vector>

using std::string;

string getUserInfoFromFile(const string& filepath);
std::vector<std::string> split(const string& complexString);
bool validate(const string& lhs, const string& rhs);

int main() {
  int inputCounter = 0;
  string login, password;

  // 1. User Info file reading
  auto userinfo = split(getUserInfoFromFile("userinfo.txt"));
  auto validLogin = userinfo.at(0); // login
  auto validPassword = userinfo.at(1); // passwd

  // 2. Input login & password
  while(true) {
    if (inputCounter == 3) {
      std::cout << "You enter the wrong password 3 times. Attempts were over." << std::endl;
      exit(1);
    }

    std::cout << "Enter username: ";
    std::getline(std::cin, login);

    std::cout << "Enter password: ";
    std::getline(std::cin, password);

    bool isValidLogin = validate(login, validLogin);
    bool isValidPassword = validate(password, validPassword);

    if (isValidLogin && isValidPassword) {
      std::cout << "Login and password is correct! Welcome to the system." << std::endl;
      break;
    }

    inputCounter++;
  }

  // DEBUG
  // std::cout << "Your username is: " << login << " with password: " << password << std::endl;

  return 0;
}

string getUserInfoFromFile(const string& filepath) {
  std::ifstream isf(filepath);
  if (isf) {
    std::stringstream buffer;
    buffer << isf.rdbuf();
    return buffer.str();
  }
  return string();
}

std::vector<std::string> split(const string& complexString) {
  std::vector<std::string> splitString;
  std::istringstream iss(complexString);
  do {
    string sub;
    iss >> sub;
    splitString.push_back(sub);
  } while (iss);

  return splitString;
}

bool validate(const string& lhs, const string& rhs) {
  return lhs == rhs;
}