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<?php

/**
 * This file is part of the Lean Mapper library (http://www.leanmapper.com)
 *
 * Copyright (c) 2013 Vojtěch Kohout (aka Tharos)
 *
 * For the full copyright and license information, please view the file
 * license-mit.txt that was distributed with this source code.
 */

namespace LeanMapper\Reflection;

use LeanMapper\Exception\InvalidAnnotationException;

/**
 * Set of property filters
 *
 * @author Vojtěch Kohout
 */
class PropertyFilters
{

    /** @var string[] */
    private $filters = array();


    public function __construct($definition, Aliases $aliases)
    {
        foreach (preg_split('#\s*\|\s*#', trim($definition)) as $set) {
            $filters = array();
            foreach (preg_split('#\s*,\s*#', $set) as $filter) {
                if ($filter === '') {
                    throw new InvalidAnnotationException('Empty filter definition given.');
                }
                $matches = array();
                preg_match('#^(?:((?:\\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)+)::)?((?:\\\\?[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)+)$#', $filter, $matches);
                if (empty($matches) or ($matches[1] !== '' and strpos($matches[2], '\\') !== false)) {
                    throw new InvalidAnnotationException('Invalid filter definition given: ' . $filter);
                }
                $function = $matches[2];
                if ($matches[1] !== '') {
                    $class = $matches[1];
                    if (substr($class, 0, 1) === '\\') {
                        $class = substr($class, 1);
                    } else {
                        $class = $aliases->translate($class);
                    }
                    $filters[] = $class . '::' . $function;
                } else {
                    if (substr($function, 0, 1) === '\\') {
                        $function = substr($function, 1);
                    } else {
                        $function = $aliases->translate($function);
                    }
                    $filters[] = $function;
                }
            }
            $this->filters[] = $filters;
        }
    }

    /**
     * Returns array of entity filters (array of callable strings)
     *
     * @param int|null $index
     * @return string[]
     */
    public function getFilters($index = null)
    {
        if ($index === null) {
            return $this->filters;
        }
        if (!isset($this->filters[$index])) {
            return array();
        }
        return $this->filters[$index];
    }

}