<?php

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

/**
 * /wp-json/bunstream/v1/... -- what the block and the classic-editor modal
 * search with. Calls BunStream server-side with the key, so the key never
 * reaches the browser. Editors only (edit_posts).
 */
class BunStream_Rest
{
    public static function init()
    {
        add_action('rest_api_init', array(__CLASS__, 'routes'));
    }

    public static function can_edit()
    {
        return current_user_can('edit_posts');
    }

    public static function routes()
    {
        register_rest_route('bunstream/v1', '/lessons', array(
            'methods' => 'GET',
            'callback' => array(__CLASS__, 'lessons'),
            'permission_callback' => array(__CLASS__, 'can_edit'),
            'args' => array(
                'q' => array('type' => 'string', 'sanitize_callback' => 'sanitize_text_field', 'default' => ''),
                'folder_id' => array('type' => 'integer', 'sanitize_callback' => 'absint', 'default' => 0),
                'page' => array('type' => 'integer', 'sanitize_callback' => 'absint', 'default' => 1),
            ),
        ));

        register_rest_route('bunstream/v1', '/folders', array(
            'methods' => 'GET',
            'callback' => array(__CLASS__, 'folders'),
            'permission_callback' => array(__CLASS__, 'can_edit'),
        ));
    }

    public static function lessons(WP_REST_Request $request)
    {
        $q = (string) $request->get_param('q');
        $folder = (int) $request->get_param('folder_id');
        $page = max(1, (int) $request->get_param('page'));

        $result = BunStream_Api::get('lessons', array(
            'q' => function_exists('mb_substr') ? mb_substr($q, 0, 120) : substr($q, 0, 120),
            'folder_id' => $folder > 0 ? $folder : null,
            'page' => $page,
        ));

        return self::respond($result);
    }

    public static function folders()
    {
        return self::respond(BunStream_Api::get('folders'));
    }

    private static function respond($result)
    {
        if (is_wp_error($result)) {
            return new WP_Error($result->get_error_code(), $result->get_error_message(), array('status' => 502));
        }

        return rest_ensure_response($result);
    }
}