<?php
/**
 * Frontend links (bookmarks) submit — zibll frontend_links_submit parity.
 *
 * @package AKSRT
 */

namespace AKSRT\Core;

defined('ABSPATH') || exit;

class LinksSubmit {

	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_frontend_links_submit', [$this, 'ajax_submit']);
		add_action('wp_ajax_nopriv_aksrt_frontend_links_submit', [$this, 'ajax_submit']);
	}

	/**
	 * AJAX: create a pending WordPress bookmark (link).
	 */
	public function ajax_submit(): void {
		if (!check_ajax_referer('aksrt_frontend_links_submit', '_wpnonce', false)) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('安全校验失败，请刷新后重试', 'aksrt')]);
		}

		if (isset($_COOKIE['aksrt_links_submit_time'])) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('操作过于频繁，请稍候再试', 'aksrt')]);
		}

		$link_name = isset($_POST['link_name']) ? sanitize_text_field(wp_unslash((string) $_POST['link_name'])) : '';
		$link_url  = isset($_POST['link_url']) ? esc_url_raw(wp_unslash((string) $_POST['link_url'])) : '';
		$link_desc = isset($_POST['link_description']) ? sanitize_text_field(wp_unslash((string) $_POST['link_description'])) : '';
		$cat_raw   = isset($_POST['link_category']) ? wp_unslash($_POST['link_category']) : [];

		if ($link_name === '') {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('请填写网站名称', 'aksrt')]);
		}
		if ($link_url === '' || !wp_http_validate_url($link_url)) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('网站地址格式错误', 'aksrt')]);
		}

		// Optional logo upload.
		$logo_url = '';
		if (!empty($_FILES['image']['name'])) {
			require_once ABSPATH . 'wp-admin/includes/file.php';
			require_once ABSPATH . 'wp-admin/includes/media.php';
			require_once ABSPATH . 'wp-admin/includes/image.php';
			$attachment_id = media_handle_upload('image', 0);
			if (is_wp_error($attachment_id)) {
				wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => $attachment_id->get_error_message()]);
			}
			$src = wp_get_attachment_image_src((int) $attachment_id, 'medium');
			$logo_url = !empty($src[0]) ? (string) $src[0] : (string) wp_get_attachment_url((int) $attachment_id);
		}

		$categories = [];
		if (is_array($cat_raw)) {
			$categories = array_values(array_filter(array_map('intval', $cat_raw)));
		} elseif ($cat_raw !== '' && $cat_raw !== null) {
			$categories = [absint($cat_raw)];
		}

		// Duplicate URL guard.
		global $wpdb;
		$exists = (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(1) FROM {$wpdb->links} WHERE link_url = %s",
				$link_url
			)
		);
		if ($exists > 0) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => __('您的链接已提交，请勿重复提交', 'aksrt')]);
		}

		if (!function_exists('wp_insert_link')) {
			require_once ABSPATH . 'wp-admin/includes/bookmark.php';
		}

		$linkdata = [
			'link_name'        => $link_name,
			'link_url'         => $link_url,
			'link_description' => $link_desc,
			'link_image'       => $logo_url,
			// Non-admins create invisible links pending review (zibll parity).
			'link_visible'     => current_user_can('manage_links') ? 'Y' : 'N',
			'link_category'    => $categories,
		];

		$links_id = wp_insert_link($linkdata, true);
		if (is_wp_error($links_id)) {
			wp_send_json(['error' => 1, 'ys' => 'danger', 'msg' => $links_id->get_error_message()]);
		}

		// 30s client throttle cookie.
		if (!headers_sent()) {
			setcookie('aksrt_links_submit_time', (string) time(), time() + 30, COOKIEPATH ?: '/', COOKIE_DOMAIN, is_ssl(), true);
		}

		$msg = $linkdata['link_visible'] === 'Y'
			? __('提交成功', 'aksrt')
			: __('提交成功，等待管理员处理', 'aksrt');

		/**
		 * Fires after a frontend link submission is stored.
		 *
		 * @param array $linkdata Sanitized bookmark data.
		 * @param int   $links_id New link ID.
		 */
		do_action('aksrt_frontend_links_submit_success', $linkdata, (int) $links_id);

		wp_send_json(['error' => 0, 'msg' => $msg, 'reload' => true]);
	}
}