main.cpp

#include <iostream>
#include <array>

#include "card.h"

Result playABlackjack(std::array<Card, 52> &deck);
void countPlayerScore(int *playerScore, Card &card);
void printScore(int playerScore, int dealerScore);

int main()
{
    using namespace std;

    srand(static_cast<unsigned int>(time(nullptr)));

    array<Card, 52> deck;

    for (int i = 0; i < static_cast<int>(Suit::MAX_SUIT); ++i) {
        for (int j = 0; j < 13; ++j) {
            Card card { static_cast<Dignity>(j), static_cast<Suit>(i) };
            deck[static_cast<unsigned long long>(i * 13 + j)] = card;
        }
    }

    while (true) {
        shuffleDeck(deck);

        Result winner = playABlackjack(deck);

        if (winner == Result::PLAYER_WINS) {
            cout << "Player wins!" << endl;
        }
        else if (winner == Result::PLAYER_LOSE) {
            cout << "Player lose" << endl;
        }
        else {
            cout << "No one wins" << endl;
        }

        bool playAgain { false };

        while (true) {
            cout << "Do you wanna play again? (y/n): ";
            char yesNo;
            cin >> yesNo;

            if (cin.fail()) {
                cin.clear();
                cin.ignore(32676, '\n');

                continue;
            }

            if (yesNo == 'y' || yesNo == 'n') {
                playAgain = yesNo == 'y';

                break;
            }
        }

        cout << endl;

        if (playAgain) {
            continue;
        }
        else {
            break;
        }
    }

    return 0;
}

Result playABlackjack(std::array<Card, 52> &deck)
{
    using namespace std;

    Card *cardPtr = &deck[0];
    int dealerScore { 0 };
    int playerScore { 0 };

    cout << "Let's play a Blackjack.\n";

    dealerScore += getCardValue(*cardPtr);

    playerScore += getCardValue(*(++cardPtr));

    countPlayerScore(&playerScore, *(++cardPtr));
    printScore(playerScore, dealerScore);

    while (true) {
        cout << "Enter 'hit' or 'stand': ";
        string hitOrStand;
        cin >> hitOrStand;

        if (cin.fail()) {
            cin.clear();
            cin.ignore(32676, '\n');

            continue;
        }

        if (hitOrStand == "hit") {
            countPlayerScore(&playerScore, *(++cardPtr));

            cout << "Player score: " << playerScore << endl;

            if (playerScore > 21) {
                return Result::PLAYER_LOSE;
            }
        }

        if (hitOrStand == "stand") {
            break;
        }
    }

    if (playerScore > 21) {
        printScore(playerScore, dealerScore);

        return Result::PLAYER_LOSE;
    }

    while (true) {
        if (dealerScore >= 17) {
            break;
        }

        dealerScore += getCardValue(*(++cardPtr));
    }

    if (dealerScore > 21) {
        printScore(playerScore, dealerScore);

        return Result::PLAYER_WINS;
    }
    else if (playerScore > dealerScore) {
        printScore(playerScore, dealerScore);

        return Result::PLAYER_WINS;
    }
    else if (playerScore < dealerScore) {
        printScore(playerScore, dealerScore);

        return Result::PLAYER_LOSE;
    }
    else {
        printScore(playerScore, dealerScore);

        return Result::NO_ONE_WINS;
    }
}

void countPlayerScore(int *playerScore, Card &card)
{
    int cardValue = getCardValue(card);

    if (cardValue == 11 && *playerScore >= 11) {
        *playerScore += 1;
    }
    else {
        *playerScore += cardValue;
    }
}

void printScore(int playerScore, int dealerScore)
{
    std::cout << "\nDealer score: " << dealerScore << "\nPlayer score: " << playerScore << "\n\n";
}