<?php
namespace TYPO3\CMS\Extensionmanager\Utility;

/**
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

/**
 * Utility for dealing with ext_emconf
 *
 * @author Susanne Moog <susanne.moog@typo3.org>
 */
class EmConfUtility implements \TYPO3\CMS\Core\SingletonInterface {

	/**
	 * Returns the $EM_CONF array from an extensions ext_emconf.php file
	 *
	 * @param array $extension Extension information array
	 * @return array EMconf array values.
	 */
	public function includeEmConf(array $extension) {
		$_EXTKEY = $extension['key'];
		$path = PATH_site . $extension['siteRelPath'] . 'ext_emconf.php';
		$EM_CONF = NULL;
		if (file_exists($path)) {
			include $path;
			if (is_array($EM_CONF[$_EXTKEY])) {
				return $EM_CONF[$_EXTKEY];
			}
		}
		return FALSE;
	}

	/**
	 * Generates the content for the ext_emconf.php file
	 * Sets dependencies from TER data if any
	 *
	 * @internal
	 * @param array $extensionData
	 * @param \TYPO3\CMS\Extensionmanager\Domain\Model\Extension $extension Extension object from TER data
	 * @return string
	 */
	public function constructEmConf(array $extensionData, \TYPO3\CMS\Extensionmanager\Domain\Model\Extension $extension = NULL) {
		if (is_object($extension) && empty($extensionData['EM_CONF']['constraints'])) {
			$extensionData['EM_CONF']['constraints'] = unserialize($extension->getSerializedDependencies());
		}
		$emConf = $this->fixEmConf($extensionData['EM_CONF']);
		$emConf = var_export($emConf, TRUE);
		$code = '<?php

/***************************************************************
 * Extension Manager/Repository config file for ext "' . $extensionData['extKey'] . '".
 *
 * Auto generated ' . date('d-m-Y H:i') . '
 *
 * Manual updates:
 * Only the data in the array - everything else is removed by next
 * writing. "version" and "dependencies" must not be touched!
 ***************************************************************/

$EM_CONF[$_EXTKEY] = ' . $emConf . ';

';
		return str_replace('  ', TAB, $code);
	}

	/**
	 * Fix the em conf - Converts old / ter em_conf format to new format
	 *
	 * @param array $emConf
	 * @return array
	 */
	public function fixEmConf(array $emConf) {
		if (
			!isset($emConf['constraints']) || !isset($emConf['constraints']['depends'])
			|| !isset($emConf['constraints']['conflicts']) || !isset($emConf['constraints']['suggests'])
		) {
			if (!isset($emConf['constraints']) || !isset($emConf['constraints']['depends'])) {
				$emConf['constraints']['depends'] = $this->stringToDependency($emConf['dependencies']);
				if (strlen($emConf['PHP_version'])) {
					$emConf['constraints']['depends']['php'] = $emConf['PHP_version'];
				}
				if (strlen($emConf['TYPO3_version'])) {
					$emConf['constraints']['depends']['typo3'] = $emConf['TYPO3_version'];
				}
			}
			if (!isset($emConf['constraints']) || !isset($emConf['constraints']['conflicts'])) {
				$emConf['constraints']['conflicts'] = $this->stringToDependency($emConf['conflicts']);
			}
			if (!isset($emConf['constraints']) || !isset($emConf['constraints']['suggests'])) {
				$emConf['constraints']['suggests'] = array();
			}
		}

		// Remove TER v1-style entries
		unset($emConf['dependencies']);
		unset($emConf['conflicts']);
		unset($emConf['suggests']);
		unset($emConf['private']);
		unset($emConf['download_password']);
		unset($emConf['TYPO3_version']);
		unset($emConf['PHP_version']);
		unset($emConf['internal']);
		unset($emConf['module']);
		unset($emConf['loadOrder']);
		unset($emConf['lockType']);
		unset($emConf['shy']);
		unset($emConf['priority']);
		unset($emConf['modify_tables']);
		unset($emConf['CGLcompliance']);
		unset($emConf['CGLcompliance_note']);

		return $emConf;
	}

	/**
	 * Checks whether the passed dependency is TER-style (string) or
	 * TER2-style (array) and returns a single string for displaying the
	 * dependencies.
	 *
	 * It leaves out all version numbers and the "php" and "typo3" dependencies,
	 * as they are implicit and of no interest without the version number.
	 *
	 * @param mixed $dependency Either a string or an array listing dependencies.
	 * @return string A simple dependency list for display
	 */
	public function stringToDependency($dependency) {
		$constraint = array();
		if (is_string($dependency) && strlen($dependency)) {
			$dependency = explode(',', $dependency);
			foreach ($dependency as $v) {
				$constraint[$v] = '';
			}
		}
		return $constraint;
	}

}
