<?php

namespace Modules\Core\Shipping\Carriers\Acs;

use Lunar\DataTypes\Price;
use Lunar\DataTypes\ShippingOption;
use Lunar\Shipping\DataTransferObjects\ShippingOptionRequest;
use Lunar\Shipping\Interfaces\ShippingRateInterface;
use Lunar\Shipping\Models\ShippingRate;
use Modules\Core\Shipping\Carriers\Acs\Exceptions\AcsApiException;
use Modules\Core\Shipping\Concerns\ResolvesFixedPricing;
use Modules\Core\Shipping\Contracts\SupportsLivePricing;

class AcsRateDriver implements ShippingRateInterface, SupportsLivePricing
{
    use ResolvesFixedPricing;

    public ShippingRate $shippingRate;

    public function __construct(
        private readonly AcsClient $client,
        private readonly AreaResolver $areaResolver,
    ) {}

    public function name(): string
    {
        return 'ACS Courier';
    }

    public function description(): string
    {
        return 'Live rate quote from ACS Courier.';
    }

    public function resolve(ShippingOptionRequest $shippingOptionRequest): ?ShippingOption
    {
        $shippingRate = $shippingOptionRequest->shippingRate;
        $shippingMethod = $shippingRate->shippingMethod;
        $cart = $shippingOptionRequest->cart;

        if (($shippingMethod->data['charge_by'] ?? 'cart_total') !== 'live') {
            return $this->resolveFixedPrice($shippingRate, $shippingMethod, $cart);
        }

        $postcode = $cart->shippingAddress?->postcode;

        if (! $postcode) {
            return null;
        }

        return $this->resolveLivePrice($shippingRate, $shippingMethod, $cart, $postcode);
    }

    private function resolveLivePrice(ShippingRate $shippingRate, $shippingMethod, $cart, string $postcode): ?ShippingOption
    {
        try {
            $destination = $this->areaResolver->resolve($postcode);

            $response = $this->client->call('ACS_Price_Calculation', [
                'Billing_Code' => config('acs.billing_code'),
                'Acs_Station_Destination' => $destination->stationId,
                'Weight' => $this->totalWeightInKg($cart),
                'Pickup_Date' => now()->toDateString(),
                'Charge_Type' => 2,
            ])->throwIfError();
        } catch (AcsApiException $e) {
            report($e);

            return null;
        }

        $amount = (int) round(($response->valueOutput['Total_Ammount'] ?? 0) * 100);

        return new ShippingOption(
            name: $shippingMethod->name ?: $this->name(),
            description: $shippingMethod->description ?: $this->description(),
            identifier: $shippingRate->getIdentifier(),
            price: new Price($amount, $cart->currency, 1),
            taxClass: $shippingRate->getTaxClass(),
            taxReference: $shippingRate->getTaxReference(),
            meta: ['acs_station_destination' => $destination->stationId],
        );
    }

    public function on(ShippingRate $shippingRate): self
    {
        $this->shippingRate = $shippingRate;

        return $this;
    }

    private function totalWeightInKg($cart): float
    {
        $weight = 0.0;

        foreach ($cart->lines->load('purchasable') as $line) {
            $variant = $line->purchasable;

            if (! $variant || ! $variant->weight_value) {
                continue;
            }

            $unit = $variant->weight_unit ?? 'kg';
            $value = (float) $variant->weight_value;

            $weight += match ($unit) {
                'g' => $value / 1000,
                'lb' => $value * 0.45359237,
                'oz' => $value * 0.0283495231,
                default => $value, // kg
            } * $line->quantity;
        }

        return max($weight, 0.5); // ACS minimum billable weight
    }
}