<?php

/**

 * Server-side rendering of the `core/rss` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/rss` block on server.

 *

 * @since 5.2.0

 *

 * @param array $attributes The block attributes.

 *

 * @return string Returns the block content with received rss items.

 */

function render_block_core_rss( $attributes ) {

	if ( in_array( untrailingslashit( $attributes['feedURL'] ), array( site_url(), home_url() ), true ) ) {

		return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'Adding an RSS feed to this site’s homepage is not supported, as it could lead to a loop that slows down your site. Try using another block, like the <strong>Latest Posts</strong> block, to list posts from the site.' ) . '</div></div>';

	}

	$rss = fetch_feed( $attributes['feedURL'] );

	if ( is_wp_error( $rss ) ) {

		return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $rss->get_error_message() ) . '</div></div>';

	}

	if ( ! $rss->get_item_quantity() ) {

		return '<div class="components-placeholder"><div class="notice notice-error">' . __( 'An error has occurred, which probably means the feed is down. Try again later.' ) . '</div></div>';

	}

	$rss_items  = $rss->get_items( 0, $attributes['itemsToShow'] );

	$list_items = '';

	foreach ( $rss_items as $item ) {

		$title = esc_html( trim( strip_tags( $item->get_title() ) ) );

		if ( empty( $title ) ) {

			$title = __( '(no title)' );

		}

		$link = $item->get_link();

		$link = esc_url( $link );

		if ( $link ) {

			$title = "<a href='{$link}'>{$title}</a>";

		}

		$title = "<div class='wp-block-rss__item-title'>{$title}</div>";

		$date = '';

		if ( $attributes['displayDate'] ) {

			$date = $item->get_date( 'U' );

			if ( $date ) {

				$date = sprintf(

					'<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',

					esc_attr( date_i18n( 'c', $date ) ),

					esc_attr( date_i18n( get_option( 'date_format' ), $date ) )

				);

			}

		}

		$author = '';

		if ( $attributes['displayAuthor'] ) {

			$author = $item->get_author();

			if ( is_object( $author ) ) {

				$author = $author->get_name();

				if ( ! empty( $author ) ) {

					$author = '<span class="wp-block-rss__item-author">' . sprintf(

						/* translators: byline. %s: author. */

						__( 'by %s' ),

						esc_html( strip_tags( $author ) )

					) . '</span>';

				}

			}

		}

		$excerpt     = '';

		$description = $item->get_description();

		if ( $attributes['displayExcerpt'] && ! empty( $description ) ) {

			$excerpt = html_entity_decode( $description, ENT_QUOTES, get_option( 'blog_charset' ) );

			$excerpt = esc_attr( wp_trim_words( $excerpt, $attributes['excerptLength'], ' […]' ) );

			// Change existing [...] to […].

			if ( '[...]' === substr( $excerpt, -5 ) ) {

				$excerpt = substr( $excerpt, 0, -5 ) . '[…]';

			}

			$excerpt = '<div class="wp-block-rss__item-excerpt">' . esc_html( $excerpt ) . '</div>';

		}

		$list_items .= "<li class='wp-block-rss__item'>{$title}{$date}{$author}{$excerpt}</li>";

	}

	$classnames = array();

	if ( isset( $attributes['blockLayout'] ) && 'grid' === $attributes['blockLayout'] ) {

		$classnames[] = 'is-grid';

	}

	if ( isset( $attributes['columns'] ) && 'grid' === $attributes['blockLayout'] ) {

		$classnames[] = 'columns-' . $attributes['columns'];

	}

	if ( $attributes['displayDate'] ) {

		$classnames[] = 'has-dates';

	}

	if ( $attributes['displayAuthor'] ) {

		$classnames[] = 'has-authors';

	}

	if ( $attributes['displayExcerpt'] ) {

		$classnames[] = 'has-excerpts';

	}

	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => implode( ' ', $classnames ) ) );

	return sprintf( '<ul %s>%s</ul>', $wrapper_attributes, $list_items );

}

/**

 * Registers the `core/rss` block on server.

 *

 * @since 5.2.0

 */

function register_block_core_rss() {

	register_block_type_from_metadata(

		__DIR__ . '/rss',

		array(

			'render_callback' => 'render_block_core_rss',

		)

	);

}

add_action( 'init', 'register_block_core_rss' );