<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Bundle\FrameworkBundle\Test;

use PHPUnit\Framework\TestCase;
use Symfony\Component\DependencyInjection\ResettableContainerInterface;
use Symfony\Component\HttpKernel\KernelInterface;

/**
 * KernelTestCase is the base class for tests needing a Kernel.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
abstract class KernelTestCase extends TestCase
{
    protected static $class;

    /**
     * @var KernelInterface
     */
    protected static $kernel;

    /**
     * @return string The Kernel class name
     *
     * @throws \RuntimeException
     * @throws \LogicException
     */
    protected static function getKernelClass()
    {
        if (!isset($_SERVER['KERNEL_CLASS']) && !isset($_ENV['KERNEL_CLASS'])) {
            throw new \LogicException(sprintf('You must set the KERNEL_CLASS environment variable to the fully-qualified class name of your Kernel in phpunit.xml / phpunit.xml.dist or override the %1$s::createKernel() or %1$s::getKernelClass() method.', static::class));
        }

        if (!class_exists($class = $_ENV['KERNEL_CLASS'] ?? $_SERVER['KERNEL_CLASS'])) {
            throw new \RuntimeException(sprintf('Class "%s" doesn\'t exist or cannot be autoloaded. Check that the KERNEL_CLASS value in phpunit.xml matches the fully-qualified class name of your Kernel or override the %s::createKernel() method.', $class, static::class));
        }

        return $class;
    }

    /**
     * Boots the Kernel for this test.
     *
     * @return KernelInterface A KernelInterface instance
     */
    protected static function bootKernel(array $options = array())
    {
        static::ensureKernelShutdown();

        static::$kernel = static::createKernel($options);
        static::$kernel->boot();

        return static::$kernel;
    }

    /**
     * Creates a Kernel.
     *
     * Available options:
     *
     *  * environment
     *  * debug
     *
     * @return KernelInterface A KernelInterface instance
     */
    protected static function createKernel(array $options = array())
    {
        if (null === static::$class) {
            static::$class = static::getKernelClass();
        }

        if (isset($options['environment'])) {
            $env = $options['environment'];
        } elseif (isset($_ENV['APP_ENV'])) {
            $env = $_ENV['APP_ENV'];
        } elseif (isset($_SERVER['APP_ENV'])) {
            $env = $_SERVER['APP_ENV'];
        } else {
            $env = 'test';
        }

        if (isset($options['debug'])) {
            $debug = $options['debug'];
        } elseif (isset($_ENV['APP_DEBUG'])) {
            $debug = $_ENV['APP_DEBUG'];
        } elseif (isset($_SERVER['APP_DEBUG'])) {
            $debug = $_SERVER['APP_DEBUG'];
        } else {
            $debug = true;
        }

        return new static::$class($env, $debug);
    }

    /**
     * Shuts the kernel down if it was used in the test.
     */
    protected static function ensureKernelShutdown()
    {
        if (null !== static::$kernel) {
            $container = static::$kernel->getContainer();
            static::$kernel->shutdown();
            if ($container instanceof ResettableContainerInterface) {
                $container->reset();
            }
        }
    }

    /**
     * Clean up Kernel usage in this test.
     */
    protected function tearDown()
    {
        static::ensureKernelShutdown();
    }
}
