<?php

declare(strict_types=1);

namespace Tests\Unit\Academy;

use App\Services\Academy\AcademyBillingPlanService;
use ReflectionMethod;
use Tests\TestCase;

final class AcademyBillingPlanServiceTest extends TestCase
{
    private array $originalEnv = [];

    protected function tearDown(): void
    {
        $this->restoreEnv('STRIPE_SECRET');

        parent::tearDown();
    }

    public function test_stripe_secret_ignores_non_string_cashier_secret_and_falls_back_to_env(): void
    {
        config()->set('cashier.secret', ['secret' => 'invalid']);
        $this->setEnv('STRIPE_SECRET', '  sk_test_fallback  ');

        $service = new AcademyBillingPlanService();

        $this->assertSame('sk_test_fallback', $this->invokeStripeSecret($service));
    }

    public function test_stripe_secret_returns_null_when_no_string_secret_is_available(): void
    {
        config()->set('cashier.secret', ['secret' => 'invalid']);
        $this->setEnv('STRIPE_SECRET', null);

        $service = new AcademyBillingPlanService();

        $this->assertNull($this->invokeStripeSecret($service));
    }

    private function invokeStripeSecret(AcademyBillingPlanService $service): ?string
    {
        $method = new ReflectionMethod($service, 'stripeSecret');
        $method->setAccessible(true);

        /** @var ?string $secret */
        $secret = $method->invoke($service);

        return $secret;
    }

    private function setEnv(string $key, ?string $value): void
    {
        if (! array_key_exists($key, $this->originalEnv)) {
            $this->originalEnv[$key] = [
                'server' => $_SERVER[$key] ?? null,
                'env' => $_ENV[$key] ?? null,
                'putenv' => getenv($key) === false ? null : getenv($key),
            ];
        }

        if ($value === null) {
            putenv($key);
            unset($_SERVER[$key], $_ENV[$key]);

            return;
        }

        putenv($key.'='.$value);
        $_SERVER[$key] = $value;
        $_ENV[$key] = $value;
    }

    private function restoreEnv(string $key): void
    {
        if (! array_key_exists($key, $this->originalEnv)) {
            return;
        }

        $original = $this->originalEnv[$key];

        if ($original['putenv'] === null) {
            putenv($key);
        } else {
            putenv($key.'='.$original['putenv']);
        }

        if ($original['server'] === null) {
            unset($_SERVER[$key]);
        } else {
            $_SERVER[$key] = $original['server'];
        }

        if ($original['env'] === null) {
            unset($_ENV[$key]);
        } else {
            $_ENV[$key] = $original['env'];
        }
    }
}