<?php
/**
 * 文章导航页设置 AJAX（zibll action/post_navs.php parity）.
 *
 * @package AKSRT
 */

namespace AKSRT\Core;

defined('ABSPATH') || exit;

class PostsNavs {

	private static $instance = null;

	public static function get_instance(): self {
		if (null === self::$instance) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function init(): void {
		add_action('wp_ajax_aksrt_post_navs_settings', [$this, 'ajax_save_settings']);
	}

	/**
	 * Super-admin only: save navs_page_name / desc / ordered cat IDs.
	 */
	public function ajax_save_settings(): void {
		if (!current_user_can('manage_options')) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('权限不足', 'aksrt')]);
		}
		if (!check_ajax_referer('aksrt_post_navs_settings', '_wpnonce', false)) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('安全校验失败', 'aksrt')]);
		}

		$page_id = isset($_POST['page_id']) ? absint($_POST['page_id']) : 0;
		if ($page_id <= 0 || get_post_type($page_id) !== 'page') {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('无效页面', 'aksrt')]);
		}

		$cat_ids = [];
		if (isset($_POST['navs_show_cat_id'])) {
			$raw = wp_unslash($_POST['navs_show_cat_id']);
			if (is_array($raw)) {
				$cat_ids = array_values(array_filter(array_map('intval', $raw)));
			} elseif (is_string($raw) && $raw !== '') {
				$decoded = json_decode($raw, true);
				if (is_array($decoded)) {
					$cat_ids = array_values(array_filter(array_map('intval', $decoded)));
				} else {
					$cat_ids = array_values(array_filter(array_map('intval', explode(',', $raw))));
				}
			}
		}

		if (empty($cat_ids)) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('请选择需要显示的分类', 'aksrt')]);
		}

		if (isset($_POST['navs_page_name'])) {
			update_post_meta($page_id, 'navs_page_name', sanitize_text_field(wp_unslash((string) $_POST['navs_page_name'])));
		}
		if (isset($_POST['navs_page_desc'])) {
			update_post_meta($page_id, 'navs_page_desc', sanitize_text_field(wp_unslash((string) $_POST['navs_page_desc'])));
		}
		update_post_meta($page_id, 'navs_show_cat_id', $cat_ids);

		wp_send_json([
			'error' => 0,
			'msg'   => __('保存成功', 'aksrt'),
			'reload'=> true,
			'ids'   => $cat_ids,
		]);
	}
}