<?php

// Register GraphQL types and fields for breadcrumbs
add_action( 'graphql_register_types', 'ccat_register_breadcrumb_graphql_types' );
function ccat_register_breadcrumb_graphql_types() {
	register_graphql_object_type(
		'BreadcrumbItem',
		array(
			'description' => 'A single breadcrumb item',
			'fields'      => array(
				'label' => array(
					'type'        => array( 'non_null' => 'String' ),
					'description' => 'The display label for the breadcrumb',
				),
				'to'    => array(
					'type'        => 'String',
					'description' => 'The to for the breadcrumb link (null for current page)',
				),
			),
		)
	);
}

// Add 'breadcrumbs' field to all Node types
add_action( 'graphql_register_types', 'ccat_register_breadcrumb_graphql_fields' );
function ccat_register_breadcrumb_graphql_fields() {
	register_graphql_field(
		'Node',
		'breadcrumbs',
		array(
			'type'        => array(
				'list_of' => array( 'non_null' => 'BreadcrumbItem' ),
			),
			'description' => 'Breadcrumb navigation items for this content',
			'resolve'     => function ( $node ) {
				return array_map(
					function ( $item ) {
						return array(
							'label' => html_entity_decode( $item['label'], ENT_QUOTES, 'UTF-8' ),
							'to'    => $item['to'] ?? null,
						);
					},
					ccat_get_breadcrumbs( $node )
				);
			},
		)
	);
}

// Helper: Get breadcrumbs for a given node
function ccat_get_breadcrumbs( $node ) {
	if ( $node instanceof \WPGraphQL\Model\Post ) {
		return ccat_get_post_breadcrumbs( $node->databaseId );
	}
	if ( $node instanceof \WPGraphQL\Model\Term ) {
		return ccat_get_term_breadcrumbs( $node->databaseId );
	}
	return array();
}

// Helper: Get breadcrumbs for a given post ID
function ccat_get_post_breadcrumbs( $post_id ) {
	$breadcrumbs = array();

	$is_front_page = get_option( 'show_on_front' ) === 'page' && (int) get_option( 'page_on_front' ) === $post_id;
	if ( $is_front_page ) {
		return $breadcrumbs;
	}

	$breadcrumbs[] = array(
		'label' => 'Accueil',
		'to'    => '/',
	);

	$post_type    = get_post_type( $post_id );
	$ancestor_ids = get_post_ancestors( $post_type === 'page' ? $post_id : get_option( "page_for_$post_type" ) );
	$ancestor_ids = array_reverse( $ancestor_ids );
	foreach ( $ancestor_ids as $ancestor_id ) {
		$breadcrumbs[] = array(
			'label' => get_the_title( $ancestor_id ),
			'to'    => ccat_is_virtual_page( $ancestor_id ) ? null : str_replace( home_url(), '', get_permalink( $ancestor_id ) ),
		);
	}

	$breadcrumbs[] = array(
		'label' => get_the_title( $post_id ),
		'to'    => null,
	);
	return $breadcrumbs;
}

// Helper: Get breadcrumbs for a given term ID
function ccat_get_term_breadcrumbs( $term_id ) {
	$breadcrumbs = array(
		array(
			'label' => 'Accueil',
			'to'    => '/',
		),
	);

	$term = get_term( $term_id );
	if ( is_wp_error( $term ) || ! $term ) {
		return $breadcrumbs;
	}

	$ancestor_ids = get_ancestors( $term->term_id, $term->taxonomy );
	$ancestor_ids = array_reverse( $ancestor_ids );
	foreach ( $ancestor_ids as $ancestor_id ) {
		$ancestor_term = get_term( $ancestor_id, $term->taxonomy );
		if ( is_wp_error( $ancestor_term ) || ! $ancestor_term ) {
			continue;
		}
		$breadcrumbs[] = array(
			'label' => $ancestor_term->name,
			'to'    => str_replace( home_url(), '', get_term_link( $ancestor_term ) ),
		);
	}

	$breadcrumbs[] = array(
		'label' => $term->name,
		'to'    => null,
	);

	return $breadcrumbs;
}