<?php

/**

 * Server-side rendering of the `core/query-pagination-next` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/query-pagination-next` block on the server.

 *

 * @param array    $attributes Block attributes.

 * @param string   $content    Block default content.

 * @param WP_Block $block      Block instance.

 *

 * @return string Returns the next posts link for the query pagination.

 */

function render_block_core_query_pagination_next( $attributes, $content, $block ) {

	$page_key = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';

	$page     = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];

	$max_page = isset( $block->context['query']['pages'] ) ? (int) $block->context['query']['pages'] : 0;

	$wrapper_attributes = get_block_wrapper_attributes();

	$default_label      = __( 'Next Page »' );

	$label              = isset( $attributes['label'] ) && ! empty( $attributes['label'] ) ? $attributes['label'] : $default_label;

	$content            = '';

	// Check if the pagination is for Query that inherits the global context.

	if ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] ) {

		$filter_link_attributes = function() use ( $wrapper_attributes ) {

			return $wrapper_attributes;

		};

		add_filter( 'next_posts_link_attributes', $filter_link_attributes );

		// Take into account if we have set a bigger `max page`

		// than what the query has.

		global $wp_query;

		if ( $max_page > $wp_query->max_num_pages ) {

			$max_page = $wp_query->max_num_pages;

		}

		$content = get_next_posts_link( $label, $max_page );

		remove_filter( 'next_posts_link_attributes', $filter_link_attributes );

	} elseif ( ! $max_page || $max_page > $page ) {

		$custom_query = new WP_Query( build_query_vars_from_query_block( $block, $page ) );

		if ( (int) $custom_query->max_num_pages !== $page ) {

			$content = sprintf(

				'<a href="%1$s" %2$s>%3$s</a>',

				esc_url( add_query_arg( $page_key, $page + 1 ) ),

				$wrapper_attributes,

				$label

			);

		}

		wp_reset_postdata(); // Restore original Post Data.

	}

	return $content;

}

/**

 * Registers the `core/query-pagination-next` block on the server.

 */

function register_block_core_query_pagination_next() {

	register_block_type_from_metadata(

		__DIR__ . '/query-pagination-next',

		array(

			'render_callback' => 'render_block_core_query_pagination_next',

		)

	);

}

add_action( 'init', 'register_block_core_query_pagination_next' );