<?php

namespace Tests\Unit;

use App\Support\Iban;
use PHPUnit\Framework\TestCase;

class IbanTest extends TestCase
{
    public function test_normalizes_spaces_and_case(): void
    {
        $this->assertSame('DE02120300000000202051', Iban::normalize('de02 1203 0000 0000 2020 51'));
        $this->assertSame('DE02120300000000202051', Iban::normalize("  DE02\t1203000000002020 51 "));
    }

    public function test_formats_in_groups_of_four(): void
    {
        $this->assertSame('DE02 1203 0000 0000 2020 51', Iban::format('DE02120300000000202051'));
    }

    public function test_accepts_valid_ibans(): void
    {
        // Offizielle Testnummern der Deutschen Bundesbank bzw. der jeweiligen Zentralbanken.
        foreach ([
            'DE02120300000000202051',
            'DE02500105170137075030',
            'AT026000000001349870',
            'CH0209000000100013997',
            'FR1420041010050500013M02606',
            'NL02ABNA0123456789',
        ] as $iban) {
            $this->assertTrue(Iban::isValid($iban), $iban . ' sollte gültig sein');
        }
    }

    public function test_rejects_a_wrong_check_digit(): void
    {
        // Zahlendreher in den letzten beiden Stellen -- Struktur und Länge stimmen weiterhin.
        $this->assertFalse(Iban::isValid('DE02120300000000202015'));
    }

    public function test_rejects_wrong_length_for_the_country(): void
    {
        $this->assertFalse(Iban::isValid('DE0212030000000020205'));
        $this->assertFalse(Iban::isValid('DE021203000000002020511'));
    }

    public function test_rejects_malformed_input(): void
    {
        foreach (['', '   ', 'kein IBAN', '1202120300000000202051', 'DEAB120300000000202051'] as $iban) {
            $this->assertFalse(Iban::isValid($iban), $iban . ' sollte ungültig sein');
        }
    }

    public function test_validates_the_normalized_form(): void
    {
        $this->assertTrue(Iban::isValid('de02 1203 0000 0000 2020 51'));
    }
}