<?php

declare(strict_types=1);

namespace Agent001\Api\Order;

\defined( 'ABSPATH' ) || exit;

use WC_Order;
use WC_Order_Item_Product;

final class OrderSerializer
{
    private TrackingResolver $tracking;

    public function __construct( ?TrackingResolver $tracking = null )
    {
        $this->tracking = $tracking ?? new TrackingResolver();
    }

    /**
     * @return array<string, mixed>
     */
    public function toArray( WC_Order $order ): array
    {
        $tracking = $this->tracking->resolve( $order );
        $numbers  = array_column( $tracking, 'number' );

        $payload = [
            'order_number'     => (string) $order->get_order_number(),
            'status'           => (string) $order->get_status(),
            'status_label'     => \wc_get_order_status_name( $order->get_status() ),
            'created_at'       => $this->formatDate( $order->get_date_created() ),
            'updated_at'       => $this->formatDate( $order->get_date_modified() ),
            'paid_at'          => $this->formatDate( $order->get_date_paid() ),
            'completed_at'     => $this->formatDate( $order->get_date_completed() ),
            'currency'         => (string) $order->get_currency(),
            'total'            => (string) $order->get_total(),
            'shipping_method'  => (string) $order->get_shipping_method(),
            'tracking_number'  => $numbers[0] ?? null,
            'tracking_numbers' => $numbers,
            'tracking'         => $tracking,
            'items'            => $this->serializeItems( $order ),
        ];

        return (array) \apply_filters( 'agent001_order_response', $payload, $order );
    }

    /**
     * @return list<array<string, string|int>>
     */
    private function serializeItems( WC_Order $order ): array
    {
        $items = [];
        foreach ( $order->get_items( 'line_item' ) as $item ) {
            if ( ! $item instanceof WC_Order_Item_Product ) {
                continue;
            }

            $items[] = [
                'name'     => (string) $item->get_name(),
                'quantity' => (int) $item->get_quantity(),
                'subtotal' => (string) $order->get_line_subtotal( $item, false, false ),
                'total'    => (string) $order->get_line_total( $item, false, false ),
            ];
        }

        return $items;
    }

    private function formatDate( $date ): ?string
    {
        return $date ? $date->date( 'c' ) : null;
    }
}