<?php
/**
 * Exposes the invoice data on the WooCommerce orders REST API.
 *
 * Adds a read-only `efacture_fr_invoice` field to order responses so other
 * systems (accounting, ERP, a headless front end) can read the invoice number,
 * type, profile and credit notes. It never exposes the file path on the server.
 *
 * @package EFactureFR
 */

defined( 'ABSPATH' ) || exit;

/**
 * REST API integration.
 */
class EFacture_FR_REST {

	/**
	 * Hook in.
	 */
	public static function init() {
		add_filter( 'woocommerce_rest_prepare_shop_order_object', array( __CLASS__, 'add_invoice_field' ), 10, 3 );
	}

	/**
	 * Attach the invoice data to an order REST response.
	 *
	 * @param WP_REST_Response $response The response object.
	 * @param WC_Order         $order    The order.
	 * @param WP_REST_Request  $request  The request (unused).
	 * @return WP_REST_Response
	 */
	public static function add_invoice_field( $response, $order, $request ) {
		if ( ! $order instanceof WC_Order ) {
			return $response;
		}

		$number = (string) $order->get_meta( EFacture_FR_Invoice_Manager::META_NUMBER );
		if ( '' === $number ) {
			return $response;
		}

		$credit_notes = array();
		foreach ( $order->get_refunds() as $refund ) {
			$cn = (string) $refund->get_meta( EFacture_FR_Invoice_Manager::META_CREDIT_NUMBER );
			if ( '' !== $cn ) {
				$credit_notes[] = array(
					'number' => $cn,
					'date'   => (string) $refund->get_meta( EFacture_FR_Invoice_Manager::META_CREDIT_DATE ),
				);
			}
		}

		$data                         = $response->get_data();
		$data['efacture_fr_invoice']  = array(
			'number'       => $number,
			'date'         => (string) $order->get_meta( EFacture_FR_Invoice_Manager::META_DATE ),
			'type'         => (string) $order->get_meta( EFacture_FR_Invoice_Manager::META_TYPE ),
			'profile'      => 'EN16931',
			// File name only — never the absolute server path.
			'pdf_file'     => (string) $order->get_meta( EFacture_FR_Facturx::META_PDF ),
			'credit_notes' => $credit_notes,
		);
		$response->set_data( $data );

		return $response;
	}
}