<?php
/**
 * PHPUnit
 *
 * Copyright (c) 2002-2010, Sebastian Bergmann <sb@sebastian-bergmann.de>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Sebastian Bergmann nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @category   Testing
 * @package    PHPUnit
 * @author     Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @copyright  2002-2010 Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @link       http://www.phpunit.de/
 * @since      File available since Release 3.3.0
 */

class BowlingGame
{
    protected $rolls = array();

    public function roll($pins)
    {
        $this->rolls[] = $pins;
    }

    protected function isSpare($frameIndex)
    {
        return $this->sumOfPinsInFrame($frameIndex) == 10;
    }

    protected function isStrike($frameIndex)
    {
        return $this->rolls[$frameIndex] == 10;
    }

    protected function sumOfPinsInFrame($frameIndex)
    {
        return $this->rolls[$frameIndex] +
               $this->rolls[$frameIndex + 1];
    }

    protected function spareBonus($frameIndex)
    {
        return $this->rolls[$frameIndex + 2];
    }

    protected function strikeBonus($frameIndex)
    {
        return $this->rolls[$frameIndex + 1] +
               $this->rolls[$frameIndex + 2];
    }

    public function score()
    {
        $score      = 0;
        $frameIndex = 0;

        for ($frame = 0; $frame < 10; $frame++) {
            if ($this->isStrike($frameIndex)) {
                $score += 10 + $this->strikeBonus($frameIndex);
                $frameIndex++;
            }

            else if ($this->isSpare($frameIndex)) {
                $score += 10 + $this->spareBonus($frameIndex);
                $frameIndex += 2;
            }

            else {
                $score += $this->sumOfPinsInFrame($frameIndex);
                $frameIndex += 2;
            }
        }

        return $score;
    }
}
