<?php
/**
 * Internal content search service.
 *
 * @package 7sky-internal-post-linker
 */

if (!defined('ABSPATH')) {
    exit;
}

/**
 * Searches linkable WordPress content and formats editor results.
 */
final class skyinpo_Content_Search {
    /**
     * Search linkable internal content.
     *
     * @param string $term Search term.
     * @param int    $current_post_id Current editor post ID.
     * @return array<int, array<string, mixed>>
     */
    public function get_search_results($term, $current_post_id) {
        $term = trim((string) $term);
        $current_post_id = absint($current_post_id);

        if (strlen($term) < 2) {
            return array();
        }

        $post_types = $this->get_searchable_post_types();
        if (empty($post_types)) {
            return array();
        }

        $post_statuses = array('publish');
        if (current_user_can('read_private_posts')) {
            $post_statuses[] = 'private';
        }

        $query = new WP_Query(
            array(
                's' => $term,
                'post_type' => $post_types,
                'post_status' => $post_statuses,
                'posts_per_page' => 8,
                'orderby' => 'modified',
                'order' => 'DESC',
                'no_found_rows' => true,
                'ignore_sticky_posts' => true,
                'search_columns' => array('post_title', 'post_name'),
            )
        );

        $results = array();
        foreach ($query->posts as $post) {
            $results[] = array(
                'id' => (int) $post->ID,
                'title' => html_entity_decode(get_the_title($post), ENT_QUOTES, get_bloginfo('charset')),
                'type' => $this->get_post_type_label($post->post_type),
                'postType' => $post->post_type,
                'url' => get_permalink($post),
                'status' => $post->post_status,
                'isCurrent' => $current_post_id === (int) $post->ID,
                'date' => get_the_date('', $post),
                'excerpt' => $this->get_result_excerpt($post),
            );
        }

        wp_reset_postdata();

        return $results;
    }

    /**
     * Return public post types that are useful as internal link targets.
     *
     * @return string[]
     */
    public function get_searchable_post_types() {
        $post_types = get_post_types(
            array(
                'public' => true,
                'show_ui' => true,
            ),
            'names'
        );

        unset($post_types['attachment']);

        return array_values($post_types);
    }

    /**
     * Get a readable post type label.
     *
     * @param string $post_type Post type name.
     * @return string
     */
    public function get_post_type_label($post_type) {
        $object = get_post_type_object($post_type);

        if (!$object || empty($object->labels->singular_name)) {
            return $post_type;
        }

        return $object->labels->singular_name;
    }

    /**
     * Build a compact excerpt for search results.
     *
     * @param WP_Post $post Post object.
     * @return string
     */
    public function get_result_excerpt(WP_Post $post) {
        $raw_excerpt = has_excerpt($post) ? $post->post_excerpt : $post->post_content;
        $excerpt = wp_strip_all_tags(strip_shortcodes($raw_excerpt));

        return html_entity_decode(wp_trim_words($excerpt, 18, '...'), ENT_QUOTES, get_bloginfo('charset'));
    }
}