<?php

use App\Enums\VatTreatment;
use App\Services\Billing\VatResolver;

test('vat treatment follows the 12.06. decision rules', function (?string $country, ?string $vatId, VatTreatment $expected) {
    expect(app(VatResolver::class)->resolve($country, $vatId))->toBe($expected);
})->with([
    'Deutschland immer mit Steuer' => ['DE', null, VatTreatment::Domestic],
    'Deutschland auch mit USt-ID mit Steuer' => ['DE', 'DE123456789', VatTreatment::Domestic],
    'EU mit gültiger USt-ID → Reverse Charge' => ['AT', 'ATU12345678', VatTreatment::ReverseCharge],
    'EU ohne USt-ID → mit Steuer' => ['AT', null, VatTreatment::EuConsumer],
    'EU mit fremdländischer USt-ID → mit Steuer' => ['AT', 'DE123456789', VatTreatment::EuConsumer],
    'Griechenland mit EL-Präfix' => ['GR', 'EL123456789', VatTreatment::ReverseCharge],
    'Drittland grundsätzlich befreit' => ['CH', null, VatTreatment::ThirdCountry],
    'Drittland auch mit ID befreit' => ['US', 'US-TAX-1', VatTreatment::ThirdCountry],
    'Fehlendes Land wie Inland behandeln' => [null, null, VatTreatment::Domestic],
]);

test('tax cents are derived from the treatment', function () {
    $resolver = app(VatResolver::class);

    expect($resolver->taxCentsFor(16723, VatTreatment::Domestic))->toBe(3177);
    expect($resolver->taxCentsFor(16723, VatTreatment::EuConsumer))->toBe(3177);
    expect($resolver->taxCentsFor(16723, VatTreatment::ReverseCharge))->toBe(0);
    expect($resolver->taxCentsFor(16723, VatTreatment::ThirdCountry))->toBe(0);
});

test('exempt treatments carry a legal tax note', function () {
    expect(VatTreatment::ReverseCharge->taxNote())->toContain('Reverse Charge');
    expect(VatTreatment::ThirdCountry->taxNote())->toContain('Nicht im Inland steuerbar');
    expect(VatTreatment::Domestic->taxNote())->toBeNull();
});