<?php
declare(strict_types=1);

namespace ROITheme\Shared\Infrastructure\Query;

use ROITheme\Shared\Domain\Contracts\PostGridQueryBuilderInterface;

/**
 * Implementacion de PostGridQueryBuilderInterface
 *
 * RESPONSABILIDAD: Construir WP_Query a partir de parametros de filtro.
 * No genera HTML ni obtiene settings.
 *
 * @package ROITheme\Shared\Infrastructure\Query
 */
final class PostGridQueryBuilder implements PostGridQueryBuilderInterface
{
    /**
     * {@inheritdoc}
     */
    public function build(array $params): \WP_Query
    {
        $args = [
            'post_type' => 'post',
            'post_status' => 'publish',
            'posts_per_page' => (int) ($params['posts_per_page'] ?? 9),
            'orderby' => $params['orderby'] ?? 'date',
            'order' => $params['order'] ?? 'DESC',
            'paged' => (int) ($params['paged'] ?? 1),
        ];

        // Offset
        if (!empty($params['offset'])) {
            $args['offset'] = (int) $params['offset'];
        }

        // Filtro por categoria(s)
        if (!empty($params['category'])) {
            $args['category_name'] = $this->sanitizeSlugs($params['category']);
        }

        // Excluir categoria(s)
        if (!empty($params['exclude_category'])) {
            $excludeIds = $this->getCategoryIds($params['exclude_category']);
            if (!empty($excludeIds)) {
                $args['category__not_in'] = $excludeIds;
            }
        }

        // Filtro por tag(s)
        if (!empty($params['tag'])) {
            $args['tag'] = $this->sanitizeSlugs($params['tag']);
        }

        // Filtro por autor
        if (!empty($params['author'])) {
            $author = $params['author'];
            if (is_numeric($author)) {
                $args['author'] = (int) $author;
            } else {
                $user = get_user_by('login', $author);
                if ($user) {
                    $args['author'] = $user->ID;
                }
            }
        }

        // Excluir posts por ID
        if (!empty($params['exclude_posts'])) {
            $excludeIds = array_map('intval', explode(',', $params['exclude_posts']));
            $excludeIds = array_filter($excludeIds, fn($id) => $id > 0);
            if (!empty($excludeIds)) {
                $args['post__not_in'] = $excludeIds;
            }
        }

        return new \WP_Query($args);
    }

    /**
     * Sanitiza slugs separados por coma
     */
    private function sanitizeSlugs(string $slugs): string
    {
        $parts = explode(',', $slugs);
        $sanitized = array_map('sanitize_title', $parts);
        return implode(',', $sanitized);
    }

    /**
     * Obtiene IDs de categorias desde slugs
     *
     * @return int[]
     */
    private function getCategoryIds(string $slugs): array
    {
        $parts = explode(',', $slugs);
        $ids = [];

        foreach ($parts as $slug) {
            $term = get_term_by('slug', trim($slug), 'category');
            if ($term instanceof \WP_Term) {
                $ids[] = $term->term_id;
            }
        }

        return $ids;
    }
}