<?php
  namespace Foxx\ComputerScience\U1;

  /**
   * A simple BlackJack(21) game.
   * @author Foxx Azalea Pinkerton
   * @since 2022-09-26
   * @teacher Mr.Wachs
   */
  class BlackJack {
    const CARDS = [
      'A' => 11,
      '2' => 2,
      '3' => 3,
      '4' => 4,
      '5' => 5,
      '6' => 6,
      '7' => 7,
      '8' => 8,
      '9' => 9,
      '10' => 10,
      'J' => 10,
      'Q' => 10,
      'K' => 10
    ];

    private $playerHand = [];
    private $dealerHand = [];

    public function __construct() {
      $this->playerHand[] = $this->getCard();
      $this->playerHand[] = $this->getCard();
      $this->dealerHand[] = $this->getCard();
      $this->dealerHand[] = $this->getCard();
      $this->play();
    }

    /**
     * Gets a random card.
     * @return string
     */
    private function getCard(): string {
      $randomNumber = rand(0, count(self::CARDS) - 1);
      $card = array_keys(self::CARDS)[$randomNumber];
      return $card;
    }

    /**
     * Gets the value of a hand.
     * @param array $hand
     * @return int
     */
    private function getHandValue(array $hand): int {
      $value = 0;
      foreach ($hand as $card) {
        $value += self::CARDS[$card];
      }
      return $value;
    }

    /**
     * Plays the game.
     */
    private function play() {
      while (true) {
        $playerValue = $this->getHandValue($this->playerHand);
        $dealerValue = $this->getHandValue($this->dealerHand);

        echo "Your hand: " . implode(', ', $this->playerHand) . " ($playerValue)\n";
        echo "Dealer hand: " . implode(', ', $this->dealerHand) . " ($dealerValue)\n";

        if ($playerValue > 21) {
          echo "You busted! You have $playerValue points.\n";
          break;
        }
        if ($dealerValue > 21) {
          echo "You win! The dealer busted with $dealerValue points.\n";
          break;
        }

        $choice = readline("Hit (H) or Stand (S)? ");
        $choice = strtoupper($choice);

        if ($choice == 'H') $this->playerHand[] = $this->getCard();
        else {
          while ($dealerValue < 17) {
            $this->dealerHand[] = $this->getCard();
            $dealerValue = $this->getHandValue($this->dealerHand);
          }

          if ($dealerValue > 21) {
            echo "The dealer busts! You win!\n";
            break;
          }

          if ($playerValue > $dealerValue) {
            echo "You Have $playerValue and the dealer has $dealerValue. You win!\n";
            break;
          } else {
            echo "You Have $playerValue and the dealer has $dealerValue. You lose!\n";
            break;
          }
        }
      }
    }
  }