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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_finder
 *
 * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Finder\Administrator\Indexer;

\defined('_JEXEC') or die;

use Joomla\String\StringHelper;
use Wamania\Snowball\NotFoundException;
use Wamania\Snowball\Stemmer\Stemmer;
use Wamania\Snowball\StemmerFactory;

/**
 * Language support class for the Finder indexer package.
 *
 * @since  4.0.0
 */
class Language
{
	/**
	 * Language support instances container.
	 *
	 * @var    Language[]
	 * @since  4.0.0
	 */
	protected static $instances = array();

/**
	 * Language locale of the class
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	public $language;

/**
	 * Spacer to use between terms
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	public $spacer = ' ';

/**
	 * The stemmer object.
	 *
	 * @var    Stemmer
	 * @since  4.0.0
	 */
	protected $stemmer = null;

/**
	 * Method to construct the language object.
	 *
	 * @since   4.0.0
	 */
	public function __construct($locale = null)
	{
		if ($locale !== null)
		{
			$this->language = $locale;
		}

// Use our generic language handler if no language is set
		if ($this->language === null)
		{
			$this->language = '*';
		}

try
		{
			$this->stemmer = StemmerFactory::create($this->language);
		}
		catch (NotFoundException $e)
		{
			// We don't have a stemmer for the language
		}
	}

/**
	 * Method to get a language support object.
	 *
	 * @param   string  $language  The language of the support object.
	 *
	 * @return  Language  A Language instance.
	 *
	 * @since   4.0.0
	 */
	public static function getInstance($language)
	{
		if (isset(self::$instances[$language]))
		{
			return self::$instances[$language];
		}

$locale = '*';

if ($language !== '*')
		{
			$locale = Helper::getPrimaryLanguage($language);
			$class  = '\\Joomla\\Component\\Finder\\Administrator\\Indexer\\Language\\' . ucfirst($locale);

if (class_exists($class))
			{
				self::$instances[$language] = new $class;

return self::$instances[$language];
			}
		}

self::$instances[$language] = new self($locale);

return self::$instances[$language];
	}

/**
	 * Method to tokenise a text string.
	 *
	 * @param   string  $input  The input to tokenise.
	 *
	 * @return  array  An array of term strings.
	 *
	 * @since   4.0.0
	 */
	public function tokenise($input)
	{
		$quotes = html_entity_decode('‘’'', ENT_QUOTES, 'UTF-8');

/*
		 * Parsing the string input into terms is a multi-step process.
		 *
		 * Regexes:
		 *  1. Remove everything except letters, numbers, quotes, apostrophe, plus, dash, period, and comma.
		 *  2. Remove plus, dash, period, and comma characters located before letter characters.
		 *  3. Remove plus, dash, period, and comma characters located after other characters.
		 *  4. Remove plus, period, and comma characters enclosed in alphabetical characters. Ungreedy.
		 *  5. Remove orphaned apostrophe, plus, dash, period, and comma characters.
		 *  6. Remove orphaned quote characters.
		 *  7. Replace the assorted single quotation marks with the ASCII standard single quotation.
		 *  8. Remove multiple space characters and replaces with a single space.
		 */
		$input = StringHelper::strtolower($input);
		$input = preg_replace('#[^\pL\pM\pN\p{Pi}\p{Pf}\'+-.,]+#mui', ' ', $input);
		$input = preg_replace('#(^|\s)[+-.,]+([\pL\pM]+)#mui', ' $1', $input);
		$input = preg_replace('#([\pL\pM\pN]+)[+-.,]+(\s|$)#mui', '$1 ', $input);
		$input = preg_replace('#([\pL\pM]+)[+.,]+([\pL\pM]+)#muiU', '$1 $2', $input);
		$input = preg_replace('#(^|\s)[\'+-.,]+(\s|$)#mui', ' ', $input);
		$input = preg_replace('#(^|\s)[\p{Pi}\p{Pf}]+(\s|$)#mui', ' ', $input);
		$input = preg_replace('#[' . $quotes . ']+#mui', '\'', $input);
		$input = preg_replace('#\s+#mui', ' ', $input);
		$input = trim($input);

// Explode the normalized string to get the terms.
		$terms = explode(' ', $input);

return $terms;
	}

/**
	 * Method to stem a token.
	 *
	 * @param   string  $token  The token to stem.
	 *
	 * @return  string  The stemmed token.
	 *
	 * @since   4.0.0
	 */
	public function stem($token)
	{
		if ($this->stemmer !== null)
		{
			return $this->stemmer->stem($token);
		}

return $token;
	}
}