<?php
namespace Codappix\SearchCore\Domain\Search;

/*
 * Copyright (C) 2016  Daniel Siepmann <coding@daniel-siepmann.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

use Codappix\SearchCore\Configuration\ConfigurationContainerInterface;
use Codappix\SearchCore\Configuration\InvalidArgumentException;
use Codappix\SearchCore\Connection\ConnectionInterface;
use Codappix\SearchCore\Connection\SearchRequestInterface;
use Codappix\SearchCore\Connection\SearchResultInterface;
use Codappix\SearchCore\Domain\Model\FacetRequest;
use Codappix\SearchCore\Domain\Model\SuggestRequest;
use TYPO3\CMS\Extbase\Object\ObjectManagerInterface;

/**
 * Service to process a search request.
 */
class SearchService
{
    /**
     * @var ConnectionInterface
     */
    protected $connection;

    /**
     * @var ConfigurationContainerInterface
     */
    protected $configuration;

    /**
     * @var ObjectManagerInterface
     */
    protected $objectManager;

    /**
     * @param ConnectionInterface $connection
     * @param ConfigurationContainerInterface $configuration
     * @param ObjectManagerInterface $objectManager
     */
    public function __construct(
        ConnectionInterface $connection,
        ConfigurationContainerInterface $configuration,
        ObjectManagerInterface $objectManager
    ) {
        $this->connection = $connection;
        $this->configuration = $configuration;
        $this->objectManager = $objectManager;
    }

    /**
     * @param SearchRequestInterface $searchRequest
     * @return SearchResultInterface
     */
    public function search(SearchRequestInterface $searchRequest)
    {
        $searchRequest->setConnection($this->connection);
        $this->addSize($searchRequest);
        $this->addConfiguredFacets($searchRequest);
        $this->addConfiguredSuggests($searchRequest);
        $this->addConfiguredFilters($searchRequest);

        return $this->connection->search($searchRequest);
    }

    /**
     * Add configured size of search result items to request.
     *
     * @param SearchRequestInterface $searchRequest
     */
    protected function addSize(SearchRequestInterface $searchRequest)
    {
        $searchRequest->setLimit(
            $this->configuration->getIfExists('searching.size') ?: 10
        );
    }

    /**
     * Add facets from configuration to request.
     *
     * @param SearchRequestInterface $searchRequest
     */
    protected function addConfiguredFacets(SearchRequestInterface $searchRequest)
    {
        $facetsConfig = $this->configuration->getIfExists('searching.facets');
        if ($facetsConfig === null) {
            return;
        }

        foreach ($facetsConfig as $identifier => $facetConfig) {
            if (!isset($facetConfig['field']) || trim($facetConfig['field']) === '') {
                // TODO: Finish throw
                throw new \Exception('message', 1499171142);
            }

            $searchRequest->addFacet($this->objectManager->get(
                FacetRequest::class,
                $identifier,
                $facetConfig['field']
            ));
        }
    }

    /**
     * Add suggests from configuration to request.
     *
     * @param SearchRequestInterface $searchRequest
     */
    protected function addConfiguredSuggests(SearchRequestInterface $searchRequest)
    {
        $suggestsConfig = $this->configuration->getIfExists('searching.suggests');
        if ($suggestsConfig === null) {
            return;
        }

        foreach ($suggestsConfig as $identifier => $suggestConfig) {
            if (!isset($suggestConfig['field']) || trim($suggestConfig['field']) === '') {
                // TODO: Finish throw
                throw new \Exception('message', 1499171142);
            }

            $searchRequest->addSuggest($this->objectManager->get(
                SuggestRequest::class,
                $identifier,
                $suggestConfig['field']
            ));
        }
    }

    /**
     * Add filters from configuration, e.g. flexform or TypoScript.
     *
     * @param SearchRequestInterface $searchRequest
     */
    protected function addConfiguredFilters(SearchRequestInterface $searchRequest)
    {
        try {
            $searchRequest->setFilter(array_merge(
                $searchRequest->getFilter(),
                $this->configuration->get('searching.filter')
            ));
        } catch (InvalidArgumentException $e) {
            // Nothing todo, no filter configured.
        }
    }
}