index.php

<?php
error_reporting(E_ALL);
session_start();

$start = microtime(true);

require 'functions.php';
require 'Card.php';
require 'GameState.php';
require 'Game.php';
require 'Player.php';
require 'Displayer.php';

unset($game);

// Stop game if requested
if (isset($_GET['stop_game'])) {
  $_SESSION['game'] = null;
  session_destroy();
}

// Load or create game
if (isset($_POST['new_game'])) {
  $game = new Game();
} else if (isset($_SESSION['game'])) {
  $game = unserialize($_SESSION['game']);
  if (!($game instanceof Game)) {
    session_destroy();
    throw new Exception('Could not load the game! Please reload.');
  }
} else {
  // Offer to create a new game if we don't have any session.
  echo '<form action="'.$_SERVER['PHP_SELF'].'" method="post">
<input type="submit" style="margin: auto" value="Create new game" name="new_game" />
</form>';
  exit;
}

$displayer = new Displayer($game);
$state = $game->getState();

if ($state === GameState::HAND_START) {
  // If this method didn't change the game state, this would open a door to
  // cheating, because cards would be distributed upon every reload.
  $game->startNewHand();
  $start_player = $game->getCurrentRoundStarter();
  if ($start_player === Game::HUMAN_ID) {
    $displayer->draw('Must start with the two of clubs', true);
  }
  else {
    $msg = 'Player ' . ($start_player+1) . ' begins the hand.';
    $displayer->draw($msg, false);
    $game->playTillHuman();
  }
  save_game_to_session($game);
}
else if ($state === GameState::AWAITING_CLUBS) {
  // Important to manually check here that we got the two of clubs
  if (post_is_valid_card_format('card') && $_POST['card'] == Card::CLUBS . 2) {
    $result = $game->processHumanMove($_POST['card']);
    if ($result === Game::MOVE_OK) {
      $nextRoundStarter = $game->playTillEnd();
      $displayer->roundEndMessage($nextRoundStarter);
      save_game_to_session($game);
    } else {
      // Throw an exception since we just checked that we got
      // the two of clubs. We should never be in this clause!
      throw new Exception('Game should have accepted two of Clubs!');
    }
  }
  else {
    $message = '<span class="error">Must start with the two of clubs!</span>';
    $displayer->draw($message, true);
  }
}
else if ($state === GameState::AWAITING_HUMAN) {
  if (post_is_valid_card_format('card')) {
    $result = $game->processHumanMove($_POST['card']);
    if ($result === Game::MOVE_OK) {
      $nextRoundStarter = $game->playTillEnd();
      $displayer->roundEndMessage($nextRoundStarter);
      save_game_to_session($game);
    }
    else {
      $displayer->handleCardError($result);
    }
  } else {
    $displayer->draw('Your turn.', true);
  }
}
else if ($state === GameState::ROUND_END) {
  $game->playTillHuman();
  $displayer->draw('Your turn', true);
  save_game_to_session($game);
}
else if ($state === GameState::GAME_END) {
  $displayer->roundEndMessage(null);
}
else {
  var_dump($game->getState());
  throw new Exception("Encountered unknown game state");
}

$end = microtime(true);
$gen_time = round($end - $start, 3);
echo '<p class="footer">
 Page generated in ' . $gen_time . '&nbsp;s
 <br /><a href="?stop_game">Stop game?</a>
</p>';
?>

 </body>
</html>