<?php

declare(strict_types=1);

namespace App\Tests\Model;

use App\Model\DestinationDto;
use PHPUnit\Framework\TestCase;
use Symfony\Component\Validator\ConstraintViolationListInterface;
use Symfony\Component\Validator\Validation;

/**
 * The stored country moved to ISO-3166-1 alpha-2, but the constraint on this DTO kept the
 * old BusProNet abbreviations while the form was already offering the new codes. Every
 * country except Schweiz and Niederlande - the two whose code happens to be unchanged -
 * was rejected as "Ungültige Auswahl" on save, so a destination could not be created or
 * edited for Österreich, Deutschland, Frankreich or Italien at all.
 *
 * The codes are asserted literally rather than read back off the map they come from, so
 * that changing the map has to be a deliberate act rather than something a test agrees
 * with by construction.
 */
class DestinationDtoTest extends TestCase
{
    public function testTheAuthorableCountriesAreTheIsoCodes(): void
    {
        $this->assertSame(['at', 'ch', 'fr', 'it', 'de', 'nl'], DestinationDto::countryCodes());
    }

    /**
     * @dataProvider isoCountryCodes
     */
    public function testAnIsoCountryCodeIsAccepted(string $code): void
    {
        $this->assertCount(0, $this->validateCountry($code));
    }

    /**
     * The four that the form offered and the constraint refused.
     *
     * @dataProvider busProNetCountryAbbreviations
     */
    public function testABusProNetAbbreviationIsNoLongerAccepted(string $abbreviation): void
    {
        $this->assertCount(1, $this->validateCountry($abbreviation));
    }

    /**
     * MyE&P drops a country it cannot map to two letters, so a destination without one is
     * a normal row rather than an invalid one.
     */
    public function testNoCountryIsAccepted(): void
    {
        $this->assertCount(0, $this->validateCountry(null));
    }

    /**
     * @return iterable<array{string}>
     */
    public static function isoCountryCodes(): iterable
    {
        foreach (DestinationDto::countryCodes() as $code) {
            yield $code => [$code];
        }
    }

    /**
     * @return iterable<array{string}>
     */
    public static function busProNetCountryAbbreviations(): iterable
    {
        yield 'a' => ['a'];
        yield 'd' => ['d'];
        yield 'f' => ['f'];
        yield 'i' => ['i'];
    }

    private function validateCountry(?string $country): ConstraintViolationListInterface
    {
        return Validation::createValidatorBuilder()
            ->enableAttributeMapping()
            ->getValidator()
            ->validateProperty((new DestinationDto())->setCountry($country), 'country')
        ;
    }
}