<?php

namespace AFEB\Modules\WPImport;

use DOMDocument;
use WP_Error;

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

/**
 * "Vertex Addons for Elementor" SimpleXMLParser Class
 * 
 * @class SimpleXMLParser
 * @version 1.4.0
 */
class SimpleXMLParser
{
	/**
	 * @param string $file
	 *
	 * @return array|\WP_Error
	 */
	public function parse($file)
	{
		$authors = $posts = $categories = $tags = $terms = [];

		libxml_use_internal_errors(true);

		$dom = new DOMDocument();
		$old_value = null;

		if (version_compare(PHP_VERSION, '8.0.0', '<') && function_exists('libxml_disable_entity_loader'))
			$old_value = libxml_disable_entity_loader(true); // phpcs:ignore Generic.PHP.DeprecatedFunctions.Deprecated

		$success = $dom->loadXML(file_get_contents($file));

		if (version_compare(PHP_VERSION, '8.0.0', '<') && ! is_null($old_value))
			libxml_disable_entity_loader($old_value); // phpcs:ignore Generic.PHP.DeprecatedFunctions.Deprecated

		if (!$success || isset($dom->doctype))
			return new WP_Error('SimpleXML_parse_error', esc_html__('There was an error when reading this WXR file', 'addons-for-elementor-builder'), libxml_get_errors());

		$xml = simplexml_import_dom($dom);
		unset($dom);

		// Halt if loading produces an error.
		if (!$xml)
			return new WP_Error('SimpleXML_parse_error', esc_html__('There was an error when reading this WXR file', 'addons-for-elementor-builder'), libxml_get_errors());

		$wxr_version = $xml->xpath('/rss/channel/wp:wxr_version');
		if (!$wxr_version)
			return new WP_Error('WXR_parse_error', esc_html__('This does not appear to be a WXR file, missing/invalid WXR version number', 'addons-for-elementor-builder'));

		$wxr_version = (string) trim($wxr_version[0]);

		// Confirm that we are dealing with the correct file format.
		if (!preg_match('/^\d+\.\d+$/', $wxr_version))
			return new WP_Error('WXR_parse_error', esc_html__('This does not appear to be a WXR file, missing/invalid WXR version number', 'addons-for-elementor-builder'));

		$base_url = $xml->xpath('/rss/channel/wp:base_site_url');
		$base_url = (string) trim(isset($base_url[0]) ? $base_url[0] : '');

		$base_blog_url = $xml->xpath('/rss/channel/wp:base_blog_url');

		if ($base_blog_url) $base_blog_url = (string) trim($base_blog_url[0]);
		else $base_blog_url = $base_url;

		$page_on_front = $xml->xpath('/rss/channel/wp:page_on_front');

		if ($page_on_front)
			$page_on_front = (int) $page_on_front[0];

		$namespaces = $xml->getDocNamespaces();

		if (!isset($namespaces['wp']))
			$namespaces['wp'] = 'http://wordpress.org/export/1.1/';

		if (!isset($namespaces['excerpt']))
			$namespaces['excerpt'] = 'http://wordpress.org/export/1.1/excerpt/';

		// Grab authors.
		foreach ($xml->xpath('/rss/channel/wp:author') as $author_arr) {
			$a = $author_arr->children($namespaces['wp']);
			$login = (string) $a->author_login;
			$authors[$login] = [
				'author_id' => (int) $a->author_id,
				'author_login' => $login,
				'author_email' => (string) $a->author_email,
				'author_display_name' => (string) $a->author_display_name,
				'author_first_name' => (string) $a->author_first_name,
				'author_last_name' => (string) $a->author_last_name,
			];
		}

		// Grab cats, tags and terms.
		foreach ($xml->xpath('/rss/channel/wp:category') as $term_arr) {
			$t = $term_arr->children($namespaces['wp']);
			$category = [
				'term_id' => (int) $t->term_id,
				'category_nicename' => (string) $t->category_nicename,
				'category_parent' => (string) $t->category_parent,
				'cat_name' => (string) $t->cat_name,
				'category_description' => (string) $t->category_description,
			];

			foreach ($t->termmeta as $meta) {
				$category['termmeta'][] = [
					'key' => (string) $meta->meta_key,
					'value' => (string) $meta->meta_value,
				];
			}

			$categories[] = $category;
		}

		foreach ($xml->xpath('/rss/channel/wp:tag') as $term_arr) {
			$t = $term_arr->children($namespaces['wp']);
			$tag = [
				'term_id' => (int) $t->term_id,
				'tag_slug' => (string) $t->tag_slug,
				'tag_name' => (string) $t->tag_name,
				'tag_description' => (string) $t->tag_description,
			];

			foreach ($t->termmeta as $meta) {
				$tag['termmeta'][] = [
					'key' => (string) $meta->meta_key,
					'value' => (string) $meta->meta_value,
				];
			}

			$tags[] = $tag;
		}

		foreach ($xml->xpath('/rss/channel/wp:term') as $term_arr) {
			$t = $term_arr->children($namespaces['wp']);
			$term = [
				'term_id' => (int) $t->term_id,
				'term_taxonomy' => (string) $t->term_taxonomy,
				'slug' => (string) $t->term_slug,
				'term_parent' => (string) $t->term_parent,
				'term_name' => (string) $t->term_name,
				'term_description' => (string) $t->term_description,
			];

			foreach ($t->termmeta as $meta) {
				$term['termmeta'][] = [
					'key' => (string) $meta->meta_key,
					'value' => (string) $meta->meta_value,
				];
			}

			$terms[] = $term;
		}

		// Grab posts.
		foreach ($xml->channel->item as $item) {
			$post = [
				'post_title' => (string) $item->title,
				'guid' => (string) $item->guid,
			];

			$dc = $item->children('http://purl.org/dc/elements/1.1/');
			$post['post_author'] = (string) $dc->creator;

			$content = $item->children('http://purl.org/rss/1.0/modules/content/');
			$excerpt = $item->children($namespaces['excerpt']);
			$post['post_content'] = (string) $content->encoded;
			$post['post_excerpt'] = (string) $excerpt->encoded;

			$wp = $item->children($namespaces['wp']);
			$post['post_id'] = (int) $wp->post_id;
			$post['post_date'] = (string) $wp->post_date;
			$post['post_date_gmt'] = (string) $wp->post_date_gmt;
			$post['comment_status'] = (string) $wp->comment_status;
			$post['ping_status'] = (string) $wp->ping_status;
			$post['post_name'] = (string) $wp->post_name;
			$post['status'] = (string) $wp->status;
			$post['post_parent'] = (int) $wp->post_parent;
			$post['menu_order'] = (int) $wp->menu_order;
			$post['post_type'] = (string) $wp->post_type;
			$post['post_password'] = (string) $wp->post_password;
			$post['is_sticky'] = (int) $wp->is_sticky;

			if (isset($wp->attachment_url))
				$post['attachment_url'] = (string) $wp->attachment_url;

			foreach ($item->category as $c) {
				$att = $c->attributes();
				if (isset($att['nicename'])) {
					$post['terms'][] = [
						'name' => (string) $c,
						'slug' => (string) $att['nicename'],
						'domain' => (string) $att['domain'],
					];
				}
			}

			foreach ($wp->postmeta as $meta) {
				$post['postmeta'][] = [
					'key' => (string) $meta->meta_key,
					'value' => (string) $meta->meta_value,
				];
			}

			foreach ($wp->comment as $comment) {
				$meta = [];
				if (isset($comment->commentmeta)) {
					foreach ($comment->commentmeta as $m) {
						$meta[] = [
							'key' => (string) $m->meta_key,
							'value' => (string) $m->meta_value,
						];
					}
				}

				$post['comments'][] = [
					'comment_id' => (int) $comment->comment_id,
					'comment_author' => (string) $comment->comment_author,
					'comment_author_email' => (string) $comment->comment_author_email,
					'comment_author_IP' => (string) $comment->comment_author_IP,
					'comment_author_url' => (string) $comment->comment_author_url,
					'comment_date' => (string) $comment->comment_date,
					'comment_date_gmt' => (string) $comment->comment_date_gmt,
					'comment_content' => (string) $comment->comment_content,
					'comment_approved' => (string) $comment->comment_approved,
					'comment_type' => (string) $comment->comment_type,
					'comment_parent' => (string) $comment->comment_parent,
					'comment_user_id' => (int) $comment->comment_user_id,
					'commentmeta' => $meta,
				];
			}

			$posts[] = $post;
		}

		return [
			'authors' => $authors,
			'posts' => $posts,
			'categories' => $categories,
			'tags' => $tags,
			'terms' => $terms,
			'base_url' => $base_url,
			'base_blog_url' => $base_blog_url,
			'page_on_front' => $page_on_front,
			'version' => $wxr_version,
		];
	}
}