<?php
/**
 * Server-side rendering of the `core/query-pagination-previous` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/query-pagination-previous` block on the server.
 *
 * @since 5.8.0
 *
 * @param array    $attributes Block attributes.
 * @param string   $content    Block default content.
 * @param WP_Block $block      Block instance.
 *
 * @return string Returns the previous posts link for the query.
 */
function render_block_core_query_pagination_previous( $attributes, $content, $block ) {
    $page_key            = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';
    $enhanced_pagination = (bool) ( $block->context['enhancedPagination'] ?? false );
    $max_page            = (int) ( $block->context['query']['pages'] ?? 0 );
    $page                = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];
    $wrapper_attributes  = get_block_wrapper_attributes();
    $show_label          = (bool) ( $block->context['showLabel'] ?? true );
    $default_label       = __( 'Previous Page' );
    $label_text          = isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ? esc_html( $attributes['label'] ) : $default_label;
    $label               = $show_label ? $label_text : '';
    $pagination_arrow    = get_query_pagination_arrow( $block, false );
    if ( ! $label ) {
        $wrapper_attributes .= ' aria-label="' . $label_text . '"';
    }
    if ( $pagination_arrow ) {
        $label = $pagination_arrow . $label;
    }
    $content = '';
    // Check if the pagination is for Query that inherits the global context
    // and handle appropriately.
    if ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] ) {
        $filter_link_attributes = static function () use ( $wrapper_attributes ) {
            return $wrapper_attributes;
        };

        add_filter( 'previous_posts_link_attributes', $filter_link_attributes );
        $content = get_previous_posts_link( $label );
        remove_filter( 'previous_posts_link_attributes', $filter_link_attributes );
    } else {
        $block_query     = new WP_Query( build_query_vars_from_query_block( $block, $page ) );
        $block_max_pages = $block_query->max_num_pages;
        $total           = ! $max_page || $max_page > $block_max_pages ? $block_max_pages : $max_page;
        wp_reset_postdata();

        if ( 1 < $page && $page <= $total ) {
            $content = sprintf(
                '<a href="%1$s" %2$s>%3$s</a>',
                esc_url( add_query_arg( $page_key, $page - 1 ) ),
                $wrapper_attributes,
                $label
            );
        }
    }

    if ( $enhanced_pagination && isset( $content ) ) {
        $p = new WP_HTML_Tag_Processor( $content );
        if ( $p->next_tag(
            array(
                'tag_name'   => 'a',
                'class_name' => 'wp-block-query-pagination-previous',
            )
        ) ) {
            $p->set_attribute( 'data-wp-key', 'query-pagination-previous' );
            $p->set_attribute( 'data-wp-on--click', 'core/query::actions.navigate' );
            $p->set_attribute( 'data-wp-on--mouseenter', 'core/query::actions.prefetch' );
            $p->set_attribute( 'data-wp-watch', 'core/query::callbacks.prefetch' );
            $content = $p->get_updated_html();
        }
    }

    return $content;
}

/**
 * Registers the `core/query-pagination-previous` block on the server.
 *
 * @since 5.8.0
 */
function register_block_core_query_pagination_previous() {
    register_block_type_from_metadata(
        __DIR__ . '/query-pagination-previous',
        array(
            'render_callback' => 'render_block_core_query_pagination_previous',
        )
    );
}
add_action( 'init', 'register_block_core_query_pagination_previous' );