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<?php
/**
 * @package     Joomla.Installation
 * @subpackage  Model
 *
 * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Installation\Model;

\defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Language\Text;
use Joomla\Database\DatabaseDriver;

/**
 * Checks model for the Joomla Core Installer.
 *
 * @since  4.0.0
 */
class ChecksModel extends BaseInstallationModel
{
	/**
	 * Checks the availability of the parse_ini_file and parse_ini_string functions.
	 *
	 * @return  boolean  True if the method exists.
	 *
	 * @since   3.1
	 */
	public function getIniParserAvailability()
	{
		$disabled_functions = ini_get('disable_functions');

if (!empty($disabled_functions))
		{
			// Attempt to detect them in the PHP INI disable_functions variable.
			$disabled_functions = explode(',', trim($disabled_functions));
			$number_of_disabled_functions = count($disabled_functions);

for ($i = 0, $l = $number_of_disabled_functions; $i < $l; $i++)
			{
				$disabled_functions[$i] = trim($disabled_functions[$i]);
			}

$result = !in_array('parse_ini_string', $disabled_functions);
		}
		else
		{
			// Attempt to detect their existence; even pure PHP implementation of them will trigger a positive response, though.
			$result = function_exists('parse_ini_string');
		}

return $result;
	}

/**
	 * Gets PHP options.
	 *
	 * @return  array  Array of PHP config options
	 *
	 * @since   3.1
	 */
	public function getPhpOptions()
	{
		$options = [];

// Check for zlib support.
		$option = new \stdClass;
		$option->label  = Text::_('INSTL_ZLIB_COMPRESSION_SUPPORT');
		$option->state  = extension_loaded('zlib');
		$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_ZLIB_COMPRESSION_SUPPORT');
		$options[] = $option;

// Check for XML support.
		$option = new \stdClass;
		$option->label  = Text::_('INSTL_XML_SUPPORT');
		$option->state  = extension_loaded('xml');
		$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_XML_SUPPORT');
		$options[] = $option;

// Check for database support.
		// We are satisfied if there is at least one database driver available.
		$available = DatabaseDriver::getConnectors();
		$option = new \stdClass;
		$option->label  = Text::_('INSTL_DATABASE_SUPPORT');
		$option->label .= '<br>(' . implode(', ', $available) . ')';
		$option->state  = count($available);
		$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_DATABASE_SUPPORT');
		$options[] = $option;

// Check for mbstring options.
		if (extension_loaded('mbstring'))
		{
			// Check for default MB language.
			$option = new \stdClass;
			$option->label  = Text::_('INSTL_MB_LANGUAGE_IS_DEFAULT');
			$option->state  = (strtolower(ini_get('mbstring.language')) == 'neutral');
			$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_MBLANG_NOTDEFAULT');
			$options[] = $option;

// Check for MB function overload.
			$option = new \stdClass;
			$option->label  = Text::_('INSTL_MB_STRING_OVERLOAD_OFF');
			$option->state  = (ini_get('mbstring.func_overload') == 0);
			$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_MBSTRING_OVERLOAD_OFF');
			$options[] = $option;
		}

// Check for a missing native parse_ini_file implementation.
		$option = new \stdClass;
		$option->label  = Text::_('INSTL_PARSE_INI_FILE_AVAILABLE');
		$option->state  = $this->getIniParserAvailability();
		$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_PARSE_INI_FILE_AVAILABLE');
		$options[] = $option;

// Check for missing native json_encode / json_decode support.
		$option = new \stdClass;
		$option->label  = Text::_('INSTL_JSON_SUPPORT_AVAILABLE');
		$option->state  = function_exists('json_encode') && function_exists('json_decode');
		$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_JSON_SUPPORT_AVAILABLE');
		$options[] = $option;

// Check for configuration file writable.
		$writable = (is_writable(JPATH_CONFIGURATION . '/configuration.php')
			|| (!file_exists(JPATH_CONFIGURATION . '/configuration.php') && is_writable(JPATH_ROOT)));

$option = new \stdClass;
		$option->label  = Text::sprintf('INSTL_WRITABLE', 'configuration.php');
		$option->state  = $writable;
		$option->notice = $option->state ? null : Text::_('INSTL_NOTICE_NEEDSTOBEWRITABLE');
		$options[] = $option;

return $options;
	}

/**
	 * Checks if all of the mandatory PHP options are met.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   3.1
	 */
	public function getPhpOptionsSufficient()
	{
		$options = $this->getPhpOptions();

foreach ($options as $option)
		{
			if ($option->state === false)
			{
				$result = $option->state;
			}
		}

return isset($result) ? false : true;
	}

/**
	 * Gets PHP Settings.
	 *
	 * @return  array
	 *
	 * @since   3.1
	 */
	public function getPhpSettings()
	{
		$settings = array();

// Check for display errors.
		$setting = new \stdClass;
		$setting->label = Text::_('INSTL_DISPLAY_ERRORS');
		$setting->state = (bool) ini_get('display_errors');
		$setting->recommended = false;
		$settings[] = $setting;

// Check for file uploads.
		$setting = new \stdClass;
		$setting->label = Text::_('INSTL_FILE_UPLOADS');
		$setting->state = (bool) ini_get('file_uploads');
		$setting->recommended = true;
		$settings[] = $setting;

// Check for output buffering.
		$setting = new \stdClass;
		$setting->label = Text::_('INSTL_OUTPUT_BUFFERING');
		$setting->state = (int) ini_get('output_buffering') !== 0;
		$setting->recommended = false;
		$settings[] = $setting;

// Check for session auto-start.
		$setting = new \stdClass;
		$setting->label = Text::_('INSTL_SESSION_AUTO_START');
		$setting->state = (bool) ini_get('session.auto_start');
		$setting->recommended = false;
		$settings[] = $setting;

// Check for native ZIP support.
		$setting = new \stdClass;
		$setting->label = Text::_('INSTL_ZIP_SUPPORT_AVAILABLE');
		$setting->state = function_exists('zip_open') && function_exists('zip_read');
		$setting->recommended = true;
		$settings[] = $setting;

// Check for GD support
		$setting = new \stdClass;
		$setting->label = Text::sprintf('INSTL_EXTENSION_AVAILABLE', 'GD');
		$setting->state = extension_loaded('gd');
		$setting->recommended = true;
		$settings[] = $setting;

// Check for iconv support
		$setting = new \stdClass;
		$setting->label = Text::sprintf('INSTL_EXTENSION_AVAILABLE', 'iconv');
		$setting->state = function_exists('iconv');
		$setting->recommended = true;
		$settings[] = $setting;

// Check for intl support
		$setting = new \stdClass;
		$setting->label = Text::sprintf('INSTL_EXTENSION_AVAILABLE', 'intl');
		$setting->state = function_exists('transliterator_transliterate');
		$setting->recommended = true;
		$settings[] = $setting;

return $settings;
	}

/**
	 * Get the current setup options from the session.
	 *
	 * @return  array  An array of options from the session.
	 *
	 * @since   3.1
	 */
	public function getOptions()
	{
		if (!empty(Factory::getSession()->get('setup.options', array())))
		{
			return Factory::getSession()->get('setup.options', array());
		}
	}

/**
	 * Method to get the form.
	 *
	 * @param   string|null  $view  The view being processed.
	 *
	 * @return  Form|boolean  Form object on success, false on failure.
	 *
	 * @since   3.1
	 */
	public function getForm($view = null)
	{
		if (!$view)
		{
			$view = Factory::getApplication()->input->getWord('view', 'setup');
		}

// Get the form.
		Form::addFormPath(JPATH_COMPONENT . '/forms');

try
		{
			$form = Form::getInstance('jform', $view, array('control' => 'jform'));
		}
		catch (\Exception $e)
		{
			Factory::getApplication()->enqueueMessage($e->getMessage(), 'error');

return false;
		}

// Check the session for previously entered form data.
		$data = (array) $this->getOptions();

// Bind the form data if present.
		if (!empty($data))
		{
			$form->bind($data);
		}

return $form;
	}
}