#include <iostream>
#include <ctime> //std::time
#include <random> //std::mt19937

constexpr int num_of_tries = 7;

// generateRandomTarget(min, max) - returns a random (via mersenne) number that user has to guess
int generateRandomTarget(int min, int max)
{
    std::mt19937 mersenne(static_cast<std::mt19937::result_type>(std::time(nullptr)));
    std::uniform_int_distribution<> targets(min, max);

    //call targets(mersenne) for a random number on [min, max]
    return targets(mersenne);
}

// getUserGuess(attempt) - returns a user's guessed number
int getUserGuess(int attempt)
{
    std::cout << "Guess #" << num_of_tries - attempt + 1 << ": ";
    int g;
    std::cin >> g;
    //TODO: add error checking for entered user guess
    return g;
}

// playGame() - plays a complete game of HiLo
void playGame()
{
    int target = generateRandomTarget(1, 100);

    int tries = num_of_tries;
    bool hasWon = false;
    while(tries > 0)
    {
        //ask for user guess
        int guess = getUserGuess(tries);

        //evaluate user guess
        if(guess == target)
        {
            hasWon = true;
            break;
        }
        else
        {
            std::string outcome = (guess > target) ? "high" : "low";
            std::cout << "Your guess is too " << outcome << std::endl;
            tries--;
        }
    }

    if(hasWon)
        std::cout << "Correct! You win!" << std::endl;
    else
        std::cout << "Sorry, you lose. Correct number was " << target << std::endl;
}

// getRematch() - ask user if they want to play again
bool getRematch()
{
    char answer;
    do {
        std::cout << "Would you like to play again (y/n)? ";
        std::cin >> answer;
    } while(answer != 'y' && answer != 'n');

    return answer == 'y';
}

int main() {

    char input;
    do {
        playGame();
    } while(getRematch());

    std::cout << "Thank you for playing." << std::endl;
    return 0;
}