<?php
namespace PressForeImporter\Parser;

/**
 * WXR Parser that makes use of the SimpleXML PHP extension.
 */
class WXR_Parser_SimpleXML {
    function parse( $file ) {
        $authors = $posts = $categories = $tags = $terms = array();

        $internal_errors = libxml_use_internal_errors(true);

        $dom = new \DOMDocument;
        $old_value = null;
        if ( function_exists( 'libxml_disable_entity_loader' ) ) {
            $old_value = libxml_disable_entity_loader( true );
        }
        $success = $dom->loadXML( file_get_contents( $file ) );
        if ( ! is_null( $old_value ) ) {
            libxml_disable_entity_loader( $old_value );
        }

        if ( ! $success || isset( $dom->doctype ) ) {
            return new \WP_Error( 'SimpleXML_parse_error', __( 'There was an error when reading this WXR file', 'wordpress-importer' ), 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', __( 'There was an error when reading this WXR file', 'wordpress-importer' ), libxml_get_errors() );

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

        $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', __( 'This does not appear to be a WXR file, missing/invalid WXR version number', 'wordpress-importer' ) );

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

        foreach ( $xml->xpath('/rss/channel/wp:term') as $term_arr ) {
            $t = $term_arr->children( $namespaces['wp'] );
            $term = array(
                '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'][] = array(
                    'key' => (string) $meta->meta_key,
                    'value' => (string) $meta->meta_value
                );
            }

            $terms[] = $term;
        }

        // grab posts
        foreach ( $xml->channel->item as $item ) {
            $post = array(
                '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'][] = array(
                        'name' => (string) $c,
                        'slug' => (string) $att['nicename'],
                        'domain' => (string) $att['domain']
                    );
            }

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

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

                $post['comments'][] = array(
                    '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 array(
            'authors' => $authors,
            'posts' => $posts,
            'terms' => $terms,
            'version' => $wxr_version
        );
    }
}