ai.php
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ai.php
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	<?php

	require_once '../../support/php/JavelinHelper.php';

	$game = json_decode($_REQUEST['game']);

	$response = array();
	if (check_win($game, 'X')) {
	$response['outcome'] = 'You win! Reload to play again.';
	} else if (count(array_filter($game)) == 9) {
	$response['outcome'] = 'Tie game. Reload to play again.';
	} else {

	do {
	$pos = mt_rand(0, 8);
	if (empty($game[$pos])) {
	$game[$pos] = 'O';
	$response['pos'] = $pos;
	$response['move'] = 'O';
	break;
	}
	} while (true);

	if (check_win($game, 'O')) {
	$response['outcome'] = 'You lose! Reload to play again.';
	}
	}

	echo JavelinHelper::renderAjaxResponse($response);

	function check_win($game, $player) {
	static $wins = array(
	0, 1, 2, // horizontal
	3, 4, 5,
	6, 7, 8,

	0, 3, 6, // vertical
	1, 4, 7,
	2, 5, 8,

	0, 4, 8, // diagonal
	6, 4, 2,
	);

	foreach (array_chunk($wins, 3) as $win) {
	$is_win = true;
	foreach ($win as $cell) {
	if ($game[$cell] !== $player) {
	$is_win = false;
	break;
	}
	}
	if ($is_win) {
	return true;
	}
	}

	return false;
	}