<?php
/**
 * Tabs Menu Block
 *
 * @package WordPress
 */

/**
 * Render callback for core/tabs-menu.
 *
 * @since 7.0.0
 *
 * @param array     $attributes Block attributes.
 * @param string    $content    Block content (contains the tabs-menu-item template).
 * @param \WP_Block $block      WP_Block instance.
 *
 * @return string Updated HTML.
 */
function gutenberg_block_core_tabs_menu_render_callback( array $attributes, string $content, \WP_Block $block ): string {
	$tabs_list = $block->context['core/tabs-list'] ?? array();

	if ( empty( $tabs_list ) ) {
		return '';
	}

	// Get the first inner block as template (tabs-menu-item)
	$inner_blocks = $block->parsed_block['innerBlocks'] ?? array();
	if ( empty( $inner_blocks ) ) {
		return '';
	}
	$template_block = $inner_blocks[0];

	// Build rendered tab items
	$tabs_markup = '';
	foreach ( $tabs_list as $index => $tab ) {
		// Create context for this specific tab
		$tab_context = array_merge(
			$block->context,
			array(
				'core/tabs-menu-item-index' => $index,
				'core/tabs-menu-item-id'    => $tab['id'] ?? '',
				'core/tabs-menu-item-label' => $tab['label'] ?? '',
			)
		);

		// Create new WP_Block instance with template and context
		$tab_block = new WP_Block( $template_block, $tab_context );

		// Render the block
		$tabs_markup .= $tab_block->render();
	}

	// Find the template block and replace it in $content with $tabs_markup
	$content = preg_replace(
		'/<button\b[^>]*\bwp-block-tabs-menu-item__template\b[^>]*>.*?<\/button>/si',
		$tabs_markup,
		$content
	);

	return $content;
}

/**
 * Registers the `core/tabs-menu` block on the server.
 *
 * @since 7.0.0
 */
function gutenberg_register_block_core_tabs_menu() {
	register_block_type_from_metadata(
		__DIR__ . '/tabs-menu',
		array(
			'render_callback' => 'gutenberg_block_core_tabs_menu_render_callback',
		)
	);
}
add_action( 'init', 'gutenberg_register_block_core_tabs_menu', 20 );