<?php

namespace SilverStripe\EnvironmentCheck\Checks;

use SilverStripe\EnvironmentCheck\EnvironmentCheck;

/**
 * Check the availability of all Solr indexes of given class.
 *
 * If there are no indexes of given class found, the returned status will still be "OK".
 *
 * @package environmentcheck
 */
class SolrIndexCheck implements EnvironmentCheck
{
    /**
     * @var null|string
     */
    protected $indexClass;

    /**
     * @param string $indexClass Limit the index checks to the specified class and all its subclasses.
     */
    public function __construct($indexClass = null)
    {
        $this->indexClass = $indexClass;
    }

    /**
     * {@inheritDoc}
     *
     * @return array
     */
    public function check()
    {
        $brokenCores = [];

        /**
         * @todo Revisit this when silverstripe/fulltextsearch has 4.x compat
         */
        if (!class_exists('\\Solr')) {
            return [
                EnvironmentCheck::ERROR,
                'Class `Solr` not found. Is the fulltextsearch module installed?'
            ];
        }

        $service = \Solr::service();
        foreach (\Solr::get_indexes($this->indexClass) as $index) {
            $core = $index->getIndexName();
            if (!$service->coreIsActive($core)) {
                $brokenCores[] = $core;
            }
        }

        if (!empty($brokenCores)) {
            return [
                EnvironmentCheck::ERROR,
                'The following indexes are unavailable: ' . implode($brokenCores, ', ')
            ];
        }

        return [EnvironmentCheck::OK, 'Expected indexes are available.'];
    }
}