<?php

declare(strict_types=1);

namespace Blax\Shop\Tests\Unit;

use Blax\Shop\Exceptions\TaxRateNotConfiguredException;
use Blax\Shop\Services\TaxService;
use Blax\Shop\Tests\TestCase;
use PHPUnit\Framework\Attributes\Test;

class TaxServiceTest extends TestCase
{
    #[Test]
    public function it_returns_the_configured_rates_for_a_non_exempt_customer(): void
    {
        config(['shop.tax.rates' => ['txr_19']]);

        $this->assertSame(['txr_19'], TaxService::rates(false));
    }

    #[Test]
    public function an_explicit_rate_list_overrides_config(): void
    {
        config(['shop.tax.rates' => ['txr_from_config']]);

        $this->assertSame(['txr_explicit'], TaxService::rates(false, ['txr_explicit']));
    }

    #[Test]
    public function an_exempt_customer_gets_no_rate_even_when_one_is_configured(): void
    {
        config(['shop.tax.rates' => ['txr_19'], 'shop.tax.require' => true]);

        // Reverse charge / zero-rated short-circuits before the require guard.
        $this->assertSame([], TaxService::rates(true));
        $this->assertSame([], TaxService::rates(true, ['txr_19']));
    }

    #[Test]
    public function empty_rates_return_empty_when_not_required(): void
    {
        config(['shop.tax.rates' => [], 'shop.tax.require' => false]);

        $this->assertSame([], TaxService::rates(false));
    }

    #[Test]
    public function empty_rates_throw_when_required(): void
    {
        config(['shop.tax.rates' => [], 'shop.tax.require' => true]);

        $this->expectException(TaxRateNotConfiguredException::class);

        TaxService::rates(false);
    }

    #[Test]
    public function it_filters_blanks_and_non_strings_and_reindexes(): void
    {
        // null / '' / non-string entries are dropped; keys are reindexed so the
        // result is a clean list Stripe accepts (a gappy array would 400).
        $this->assertSame(
            ['txr_a', 'txr_b'],
            TaxService::rates(false, ['txr_a', '', null, 0, false, 'txr_b']),
        );
    }
}