<?php

if (!defined('ABSPATH')) {
	exit;
}

final class LeExport_Link_Checker {
	/**
	 * @param string $url
	 * @param array{timeout:int,user_agent:string,allow_private_targets?:int|bool} $opts
	 * @return array{url:string, ok:bool, code:int, message:string, blocked:int}
	 */
	public static function check_url(string $url, array $opts): array {
		$allow_private = !empty($opts['allow_private_targets']);
		if (!leexport_is_safe_remote_url($url, $allow_private)) {
			return [
				'url' => $url,
				'ok' => false,
				'code' => 0,
				'message' => 'Blocked unsafe target',
				'blocked' => 1,
			];
		}

		$timeout = isset($opts['timeout']) ? (int)$opts['timeout'] : 8;
		$user_agent = isset($opts['user_agent']) ? (string)$opts['user_agent'] : 'LeExport';

		$args = [
			'timeout' => $timeout,
			'redirection' => 5,
			'user-agent' => $user_agent,
			// Default to secure behavior; can be overridden via filter if needed.
			'sslverify' => true,
		];
		$args = apply_filters('leexport_http_args', $args, $url, $opts);

		$res = wp_remote_head($url, $args);
		if (is_wp_error($res) || (int)wp_remote_retrieve_response_code($res) === 0) {
			$res = wp_remote_get($url, $args);
		}

		if (is_wp_error($res)) {
			return [
				'url' => $url,
				'ok' => false,
				'code' => 0,
				'message' => $res->get_error_message(),
				'blocked' => 0,
			];
		}

		$code = (int)wp_remote_retrieve_response_code($res);
		$msg = (string)wp_remote_retrieve_response_message($res);

		$ok = $code >= 200 && $code < 400;
		return [
			'url' => $url,
			'ok' => $ok,
			'code' => $code,
			'message' => $msg,
			'blocked' => 0,
		];
	}

	/**
	 * @param array $settings leexport_get_settings()
	 * @return array<int, array{post_id:int, post_type:string, title:string, url:string, ok:bool, code:int, message:string}>
	 */
	public static function scan_site_urls(array $settings): array {
		$link = isset($settings['link_check']) && is_array($settings['link_check']) ? $settings['link_check'] : [];
		$max_items = isset($link['max_items']) ? (int)$link['max_items'] : 50;
		if ($max_items < 1) {
			$max_items = 1;
		}
		if ($max_items > 500) {
			$max_items = 500;
		}

		$post_types = isset($settings['post_types']) && is_array($settings['post_types']) ? array_values($settings['post_types']) : ['post'];

		$q = new WP_Query(leexport_build_export_query_args($settings, [
			'posts_per_page' => $max_items,
			'no_found_rows' => true,
			'update_post_meta_cache' => false,
			'update_post_term_cache' => false,
		]));

		$opts = [
			'timeout' => isset($link['timeout']) ? (int)$link['timeout'] : 8,
			'user_agent' => isset($link['user_agent']) ? (string)$link['user_agent'] : 'LeExport',
			'allow_private_targets' => !empty($link['allow_private_targets']) ? 1 : 0,
		];

		$results = [];
		foreach ($q->posts as $post) {
			/** @var WP_Post $post */
			$url = (string)get_permalink($post);
			$check = self::check_url($url, $opts);

			$results[] = [
				'post_id' => (int)$post->ID,
				'post_type' => (string)$post->post_type,
				'title' => (string)get_the_title($post),
				'url' => $url,
				'ok' => (bool)$check['ok'],
				'code' => (int)$check['code'],
				'message' => (string)$check['message'],
			];
		}
		wp_reset_postdata();

		return $results;
	}
}