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<?php
/**
 * Server-side rendering of the `core/post-time-to-read` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/post-time-to-read` 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 rendered post author name block.
 */
function gutenberg_render_block_core_post_time_to_read( $attributes, $content, $block ) {
	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}

$content = get_the_content();

/*
	 * Average reading rate - based on average taken from
	 * https://irisreading.com/average-reading-speed-in-various-languages/
	 * (Characters/minute used for Chinese rather than words).
	 */
	$average_reading_rate = 189;

$word_count_type = wp_get_word_count_type();

$minutes_to_read = max( 1, (int) round( wp_word_count( $content, $word_count_type ) / $average_reading_rate ) );

$minutes_to_read_string = sprintf(
		/* translators: %s is the number of minutes the post will take to read. */
		_n( '%s minute', '%s minutes', $minutes_to_read ),
		$minutes_to_read
	);

$align_class_name = empty( $attributes['textAlign'] ) ? '' : "has-text-align-{$attributes['textAlign']}";

$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $align_class_name ) );

return sprintf(
		'<div %1$s>%2$s</div>',
		$wrapper_attributes,
		$minutes_to_read_string
	);
}

/**
 * Registers the `core/post-time-to-read` block on the server.
 */
function gutenberg_register_block_core_post_time_to_read() {
	register_block_type_from_metadata(
		__DIR__ . '/post-time-to-read',
		array(
			'render_callback' => 'gutenberg_render_block_core_post_time_to_read',
		)
	);
}
add_action( 'init', 'gutenberg_register_block_core_post_time_to_read', 20 );