<?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 ) {
	$breadcrumbs = array();
	if ( ! $node ) {
		return $breadcrumbs;
	}
	if ( $node instanceof \WPGraphQL\Model\Post ) {
		$post = get_post( $node->databaseId );
		if ( $post ) {
			$breadcrumbs   = ccat_get_post_breadcrumbs( $post );
			$breadcrumbs[] = array(
				'label' => get_the_title( $post->ID ),
				'to'    => null,
			);
		}
	} elseif ( $node instanceof \WPGraphQL\Model\Term ) {
		$term = get_term( $node->databaseId );
		if ( $term && ! is_wp_error( $term ) ) {
			$breadcrumbs   = ccat_get_term_breadcrumbs( $term );
			$breadcrumbs[] = array(
				'label' => $term->name,
				'to'    => null,
			);
		}
	}
	return $breadcrumbs;
}

// Helper: Get breadcrumbs for a given post
function ccat_get_post_breadcrumbs( WP_Post $post ) {
	$breadcrumbs   = array();
	$is_front_page = get_option( 'show_on_front' ) === 'page' && get_option( 'page_on_front' ) === $post->ID;
	if ( $is_front_page ) {
		return $breadcrumbs; // No breadcrumbs for the front page
	} else {
		$breadcrumbs[] = array(
			'label' => 'Accueil',
			'to'    => '/',
		);
	}
	$post_type = get_post_type( $post->ID );
	switch ( $post_type ) {
		case 'page':
			$ancestors = get_post_ancestors( $post->ID );
			if ( ! empty( $ancestors ) ) {
				$ancestors = array_reverse( $ancestors );
				foreach ( $ancestors as $ancestor_id ) {
					$breadcrumbs[] = array(
						'label' => get_the_title( $ancestor_id ),
						'to'    => str_replace( home_url(), '', get_permalink( $ancestor_id ) ),
					);
				}
			}
			break;

		default:
			if ( ! empty( $post_id = get_option( "page_for_$post_type" ) ) ) {
				$breadcrumbs[] = array(
					'label' => get_the_title( $post_id ),
					'to'    => str_replace( home_url(), '', get_permalink( $post_id ) ),
				);
			}
			break;
	}

	return $breadcrumbs;
}

// Helper: Get breadcrumbs for a given term
function ccat_get_term_breadcrumbs( WP_Term $term ) {
	$breadcrumbs = array();
	$taxonomy    = $term->taxonomy;
	if ( $term->parent ) {
		$ancestors = get_ancestors( $term->term_id, $taxonomy );
		if ( ! empty( $ancestors ) ) {
			$ancestors = array_reverse( $ancestors );
			foreach ( $ancestors as $ancestor_id ) {
				$ancestor_term = get_term( $ancestor_id, $taxonomy );
				if ( $ancestor_term && ! is_wp_error( $ancestor_term ) ) {
					$breadcrumbs[] = array(
						'label' => $ancestor_term->name,
						'to'    => str_replace( home_url(), '', get_term_link( $ancestor_term ) ),
					);
				}
			}
		}
	}
	return $breadcrumbs;
}