<?php
/**
 * Copyright (c) 2013-2014, Sebastian Bergmann <sebastian@phpunit.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.
 *
 * @package   Version
 * @author    Sebastian Bergmann <sebastian@phpunit.de>
 * @copyright 2013-2014 Sebastian Bergmann <sebastian@phpunit.de>
 * @license   http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 * @link      http://github.com/sebastianbergmann/version
 * @since     File available since Release 1.0.0
 */

namespace SebastianBergmann;

/**
 * @package   Version
 * @author    Sebastian Bergmann <sebastian@phpunit.de>
 * @copyright 2013-2014 Sebastian Bergmann <sebastian@phpunit.de>
 * @license   http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 * @link      http://github.com/sebastianbergmann/version
 * @since     Class available since Release 1.0.0
 */
class Version {
	private $path;
	private $release;
	private $version;

	/**
	 * @param string $release
	 * @param string $path
	 */
	public function __construct ( $release, $path ) {
		$this->release = $release;
		$this->path    = $path;
	}

	/**
	 * @return string
	 */
	public function getVersion () {
		if ( $this->version === null ) {
			if ( count( explode( '.', $this->release ) ) == 3 ) {
				$this->version = $this->release;
			} else {
				$this->version = $this->release . '-dev';
			}

			$git = $this->getGitInformation( $this->path );

			if ( $git ) {
				if ( count( explode( '.', $this->release ) ) == 3 ) {
					$this->version = $git;
				} else {
					$git = explode( '-', $git );

					$this->version = $this->release . '-' . end( $git );
				}
			}
		}

		return $this->version;
	}

	/**
	 * @param  string $path
	 *
	 * @return boolean|string
	 */
	private function getGitInformation ( $path ) {
		if ( ! is_dir( $path . DIRECTORY_SEPARATOR . '.git' ) ) {
			return false;
		}

		$dir = getcwd();
		chdir( $path );
		$result = @exec( 'git describe --tags 2>&1', $output, $returnCode );
		chdir( $dir );

		if ( $returnCode !== 0 ) {
			return false;
		}

		return $result;
	}
}
