<?php

namespace Modules\Core\Shipping\Carriers\BoxNow;

use Illuminate\Support\Carbon;
use Illuminate\Support\Collection;
use Lunar\Models\Order;
use Modules\Core\Shipping\Carriers\BoxNow\Exceptions\BoxNowApiException;
use Modules\Core\Shipping\Contracts\CarrierFulfillmentInterface;
use Modules\Core\Shipping\Contracts\SupportsTracking;
use Modules\Core\Shipping\DTOs\ShipmentRequest;
use Modules\Core\Shipping\DTOs\TrackingCheckpoint;
use Modules\Core\Shipping\Enums\TrackingStatus;
use Modules\Core\Shipping\Models\Shipment;

/**
 * Unlike ACS, Box Now has no manifest/pickup-list step — creating a
 * delivery request also books the courier pickup, so this only implements
 * CarrierFulfillmentInterface (not SupportsManifestBatching).
 *
 * Box Now delivers to lockers, not addresses. The storefront locker-picker
 * is out of scope for this pass — createShipment() requires the chosen
 * locker's Box Now locationId via ShipmentRequest::$destinationLocationId
 * (e.g. set manually by admin staff until checkout UI exists).
 */
class BoxNowFulfillmentService implements CarrierFulfillmentInterface, SupportsTracking
{
    public function __construct(private readonly BoxNowClient $client) {}

    public function createShipment(Order $order, ShipmentRequest $request): Shipment
    {
        $address = $order->shippingAddress;
        $destinationLocationId = $request->destinationLocationId;

        if (! $destinationLocationId) {
            throw new BoxNowApiException('No Box Now locker (locationId) was provided for this shipment.');
        }

        $isCod = $request->paymentMode === 'cod';

        $response = $this->client->request('post', '/delivery-requests', [
            'orderNumber' => $order->reference.'-'.$order->id,
            'invoiceValue' => number_format($order->total->decimal, 2, '.', ''),
            'paymentMode' => $isCod ? 'cod' : 'prepaid',
            'amountToBeCollected' => $isCod
                ? number_format($request->amountToCollect ?? $order->total->decimal, 2, '.', '')
                : '0.00',
            'origin' => [
                'contactNumber' => config('boxnow.sender.phone'),
                'contactEmail' => config('boxnow.sender.email'),
                'contactName' => config('boxnow.sender.name'),
                'locationId' => config('boxnow.origin_location_id'),
            ],
            'destination' => [
                'contactNumber' => $address->contact_phone,
                'contactEmail' => $address->contact_email,
                'contactName' => trim("{$address->first_name} {$address->last_name}"),
                'locationId' => $destinationLocationId,
            ],
            'items' => [
                [
                    'id' => (string) $order->id,
                    'name' => 'Order '.$order->reference,
                    'value' => '0.00',
                    'compartmentSize' => 1,
                    'weight' => $request->weight ?? 0,
                ],
            ],
        ]);

        $parcelId = (string) ($response['parcels'][0]['id'] ?? throw new BoxNowApiException(
            'Box Now delivery request succeeded but returned no parcel id.',
            $response,
        ));

        return Shipment::create([
            'order_id' => $order->id,
            'carrier' => 'box-now',
            'tracking_reference' => $parcelId,
            'meta' => [
                'delivery_request_id' => $response['id'] ?? null,
                'locker_id' => $destinationLocationId,
            ],
        ]);
    }

    public function printLabel(Shipment $shipment): string
    {
        $bytes = $this->client->requestRaw("/parcels/{$shipment->tracking_reference}/label.pdf");

        $shipment->update(['label_printed_at' => now()]);

        return $bytes;
    }

    public function cancelShipment(Shipment $shipment): void
    {
        $this->client->request('post', "/parcels/{$shipment->tracking_reference}:cancel");

        $shipment->update(['cancelled_at' => now()]);
    }

    public function trackShipment(Shipment $shipment): Collection
    {
        $response = $this->client->request('get', '/parcels', [
            'parcelId' => $shipment->tracking_reference,
        ]);

        $parcel = $response['data'][0] ?? null;

        if (! $parcel) {
            return collect();
        }

        $events = $parcel['events'] ?? [];

        // Fall back to a single checkpoint from the parcel's current state
        // if Box Now didn't return a detailed events history.
        if (empty($events)) {
            $events = [[
                'type' => $parcel['state'] ?? 'new',
                'locationDisplayName' => null,
                'createTime' => $parcel['updateTime'] ?? $parcel['createTime'] ?? now()->toIso8601String(),
            ]];
        }

        return collect($events)->map(fn (array $event) => new TrackingCheckpoint(
            status: $this->mapState($event['type'] ?? $parcel['state'] ?? 'new'),
            carrierStatus: $event['type'] ?? $parcel['state'] ?? null,
            message: null,
            location: $event['locationDisplayName'] ?? null,
            occurredAt: Carbon::parse($event['createTime']),
            meta: $event,
        ));
    }

    private function mapState(string $state): TrackingStatus
    {
        return match ($state) {
            'new' => TrackingStatus::Pending,
            'in-transit', 'in-depot' => TrackingStatus::InTransit,
            'in-final-destination', 'wait-for-load' => TrackingStatus::OutForDelivery,
            'delivered' => TrackingStatus::Delivered,
            'returned', 'accepted-for-return' => TrackingStatus::Returned,
            'cancelled' => TrackingStatus::Cancelled,
            'expired-return', 'missing' => TrackingStatus::Failed,
            default => TrackingStatus::Unknown,
        };
    }
}