<?php

use App\Models\Product;
use App\Models\ShoppingOrder;
use App\Models\ShoppingOrderItem;
use App\Services\DhlShipmentWeightCalculator;
use Illuminate\Database\Eloquent\Collection;

function dhlWeightOrder(int $baseWeightGrams, array $items = []): ShoppingOrder
{
    $order = new ShoppingOrder;
    $order->weight = $baseWeightGrams;
    $order->setRelation('shopping_order_items', new Collection($items));

    return $order;
}

function dhlWeightItem(int $comp, int $qty, int $productWeightGrams): ShoppingOrderItem
{
    $product = new Product;
    $product->weight = $productWeightGrams;

    $item = new ShoppingOrderItem;
    $item->comp = $comp;
    $item->qty = $qty;
    $item->setRelation('product', $product);

    return $item;
}

it('uses the shopping order weight as DHL base weight', function () {
    $weight = (new DhlShipmentWeightCalculator)->calculate(dhlWeightOrder(1250));

    expect($weight)->toBe(1.25);
});

it('adds compensation product weights to the DHL weight', function () {
    $weight = (new DhlShipmentWeightCalculator)->calculate(dhlWeightOrder(500, [
        dhlWeightItem(comp: 1, qty: 2, productWeightGrams: 250),
        dhlWeightItem(comp: 0, qty: 10, productWeightGrams: 1000),
    ]));

    expect($weight)->toBe(1.0);
});

it('falls back to a safe default DHL weight when no weight exists', function () {
    $weight = (new DhlShipmentWeightCalculator)->calculate(dhlWeightOrder(0));

    expect($weight)->toBe(1.0);
});

it('validates product specific DHL weight limits', function () {
    (new DhlShipmentWeightCalculator)->assertWithinProductLimit(1.001, 'V62KP');
})->throws(InvalidArgumentException::class, 'Gewicht 1.001 kg ueberschreitet das DHL-Maximalgewicht fuer V62KP (1.0 kg).');

it('allows regular parcel products up to the DHL parcel limit', function () {
    (new DhlShipmentWeightCalculator)->assertWithinProductLimit(31.5, 'V01PAK');

    expect(true)->toBeTrue();
});