<?php

declare(strict_types=1);

/*
 * This file is part of the SymfonyExtension package.
 *
 * (c) Kamil Kokot <kamil@kokot.me>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace FriendsOfBehat\SymfonyExtension\ServiceContainer;

use Behat\MinkExtension\ServiceContainer\MinkExtension;
use Behat\Testwork\EventDispatcher\ServiceContainer\EventDispatcherExtension;
use Behat\Testwork\ServiceContainer\Extension;
use Behat\Testwork\ServiceContainer\ExtensionManager;
use FriendsOfBehat\CrossContainerExtension\CrossContainerProcessor;
use FriendsOfBehat\CrossContainerExtension\KernelBasedContainerAccessor;
use FriendsOfBehat\CrossContainerExtension\ServiceContainer\CrossContainerExtension;
use FriendsOfBehat\SymfonyExtension\Driver\Factory\SymfonyDriverFactory;
use FriendsOfBehat\SymfonyExtension\Listener\KernelRebooter;
use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
use Symfony\Component\DependencyInjection\Container;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\Dotenv\Dotenv;

final class SymfonyExtension implements Extension
{
    /**
     * Kernel used inside Behat contexts or to create services injected to them.
     * Container is built before every scenario.
     */
    const KERNEL_ID = 'sylius_symfony_extension.kernel';

    /**
     * The current container used in scenario contexts.
     * To be used as a factory for current injected application services.
     */
    const KERNEL_CONTAINER_ID = 'sylius_symfony_extension.kernel.container';

    /**
     * Kernel used by Symfony2 driver to isolate web container from contexts' container.
     * Container is built before every request.
     */
    const DRIVER_KERNEL_ID = 'sylius_symfony_extension.driver_kernel';

    /**
     * Kernel that should be used by extensions only.
     * Container is built only once at the first use.
     */
    const SHARED_KERNEL_ID = 'sylius_symfony_extension.shared_kernel';

    /**
     * The only container built by shared kernel.
     * To be used as a factory for shared injected application services.
     */
    const SHARED_KERNEL_CONTAINER_ID = 'sylius_symfony_extension.shared_kernel.container';

    /**
     * Default symfony environment used to run your suites.
     */
    private const DEFAULT_ENV = 'test';

    /**
     * Enable or disable the debug mode
     */
    private const DEBUG_MODE = false;

    /**
     * @var CrossContainerProcessor|null
     */
    private $crossContainerProcessor;

    /**
     * {@inheritdoc}
     */
    public function getConfigKey(): string
    {
        return 'fob_symfony';
    }

    /**
     * {@inheritdoc}
     */
    public function initialize(ExtensionManager $extensionManager): void
    {
        $this->registerSymfonyDriverFactory($extensionManager);
        $this->initializeCrossContainerProcessor($extensionManager);
    }

    /**
     * {@inheritdoc}
     */
    public function configure(ArrayNodeDefinition $builder): void
    {
        $builder
            ->addDefaultsIfNotSet()
                ->children()
                    ->scalarNode('env_file')->defaultNull()->end()
                    ->arrayNode('kernel')
                        ->addDefaultsIfNotSet()
                        ->children()
                            ->scalarNode('bootstrap')->defaultValue('app/autoload.php')->end()
                            ->scalarNode('path')->defaultValue('app/AppKernel.php')->end()
                            ->scalarNode('class')->defaultValue('AppKernel')->end()
                            ->scalarNode('env')->defaultValue('test')->end()
                            ->booleanNode('debug')->defaultTrue()->end()
                        ->end()
                    ->end()
                ->end()
            ->end()
        ;
    }

    /**
     * {@inheritdoc}
     */
    public function load(ContainerBuilder $container, array $config): void
    {
        if (null !== $config['env_file']) {
            $this->loadEnvVars($container, $config['env_file']);

            $environment = false !== getenv('APP_ENV') ? getenv('APP_ENV') : self::DEFAULT_ENV;
            $debugMode = false !== getenv('APP_DEBUG') ? getenv('APP_DEBUG') : self::DEBUG_MODE;

            $config['kernel']['env'] = $environment;
            $config['kernel']['kernel'] = $debugMode;
        }

        $this->loadKernel($container, $config['kernel']);
        $this->loadKernelContainer($container);

        $this->loadDriverKernel($container);

        $this->loadSharedKernel($container);
        $this->loadSharedKernelContainer($container);

        $this->loadKernelRebooter($container);
        $this->declareSymfonyContainers($container);
    }

    /**
     * {@inheritdoc}
     */
    public function process(ContainerBuilder $container): void
    {
    }

    /**
     * @param ContainerBuilder $container
     * @param string $fileName
     */
    private function loadEnvVars(ContainerBuilder $container, string $fileName): void
    {
        $envFilePath = sprintf('%s/%s', $container->getParameter('paths.base'), $fileName);
        (new Dotenv())->load($envFilePath);
    }

    /**
     * @param ContainerBuilder $container
     */
    private function loadKernel(ContainerBuilder $container, array $config): void
    {
        $definition = new Definition($config['class'], array(
            $config['env'],
            $config['debug'],
        ));
        $definition->addMethodCall('boot');
        $definition->setFile($this->getKernelFile($container->getParameter('paths.base'), $config['path']));
        $definition->setPublic(true);

        $container->setDefinition(self::KERNEL_ID, $definition);

        $this->requireKernelBootstrapFile($container->getParameter('paths.base'), $config['bootstrap']);
    }

    /**
     * @param ContainerBuilder $container
     */
    private function loadKernelContainer(ContainerBuilder $container): void
    {
        $containerDefinition = new Definition(Container::class);
        $containerDefinition->setFactory([
            new Reference(self::KERNEL_ID),
            'getContainer',
        ]);

        $container->setDefinition(self::KERNEL_CONTAINER_ID, $containerDefinition);
    }

    /**
     * @param ContainerBuilder $container
     */
    private function loadDriverKernel(ContainerBuilder $container): void
    {
        $container->setDefinition(self::DRIVER_KERNEL_ID, $container->findDefinition(self::KERNEL_ID));
    }

    /**
     * @param ContainerBuilder $container
     */
    private function loadSharedKernel(ContainerBuilder $container): void
    {
        $container->setDefinition(self::SHARED_KERNEL_ID, $container->findDefinition(self::KERNEL_ID));
    }

    /**
     * @param ContainerBuilder $container
     */
    private function loadSharedKernelContainer(ContainerBuilder $container): void
    {
        $containerDefinition = new Definition(Container::class);
        $containerDefinition->setFactory([
            new Reference(self::SHARED_KERNEL_ID),
            'getContainer',
        ]);

        $container->setDefinition(self::SHARED_KERNEL_CONTAINER_ID, $containerDefinition);
    }

    /**
     * @param ContainerBuilder $container
     *
     * @throws \Exception
     */
    private function loadKernelRebooter(ContainerBuilder $container): void
    {
        $definition = new Definition(KernelRebooter::class, [$container->get(self::KERNEL_ID)]);
        $definition->addTag(EventDispatcherExtension::SUBSCRIBER_TAG);

        $container->setDefinition(self::KERNEL_ID . '.rebooter', $definition);
    }

    /**
     * @param ContainerBuilder $container
     *
     * @throws \Exception
     */
    private function declareSymfonyContainers(ContainerBuilder $container): void
    {
        if (null !== $this->crossContainerProcessor) {
            $this->crossContainerProcessor->addContainerAccessor(
                'symfony',
                new KernelBasedContainerAccessor($container->get(self::KERNEL_ID))
            );

            $this->crossContainerProcessor->addContainerAccessor(
                'symfony_driver',
                new KernelBasedContainerAccessor($container->get(self::DRIVER_KERNEL_ID))
            );

            $this->crossContainerProcessor->addContainerAccessor(
                'symfony_shared',
                new KernelBasedContainerAccessor($container->get(self::SHARED_KERNEL_ID))
            );
        }
    }

    /**
     * @param ExtensionManager $extensionManager
     */
    private function initializeCrossContainerProcessor(ExtensionManager $extensionManager): void
    {
        /** @var CrossContainerExtension $extension */
        $extension = $extensionManager->getExtension('fob_cross_container');
        if (null !== $extension) {
            $this->crossContainerProcessor = $extension->getCrossContainerProcessor();
        }
    }

    /**
     * @param ExtensionManager $extensionManager
     */
    private function registerSymfonyDriverFactory(ExtensionManager $extensionManager): void
    {
        /** @var MinkExtension $minkExtension */
        $minkExtension = $extensionManager->getExtension('mink');
        if (null === $minkExtension) {
            return;
        }

        $minkExtension->registerDriverFactory(new SymfonyDriverFactory(
            'symfony',
            new Reference(self::DRIVER_KERNEL_ID)
        ));
    }

    /**
     * @param string $basePath
     * @param string $kernelPath
     *
     * @return string|null
     */
    private function getKernelFile(string $basePath, string $kernelPath): ?string
    {
        $possibleFiles = [
            sprintf('%s/%s', $basePath, $kernelPath),
            $kernelPath,
        ];

        foreach ($possibleFiles as $possibleFile) {
            if (file_exists($possibleFile)) {
                return $possibleFile;
            }
        }

        return null;
    }

    /**
     * @param string $basePath
     * @param string|null $bootstrapPath
     *
     * @throws \DomainException
     */
    private function requireKernelBootstrapFile(string $basePath, ?string $bootstrapPath): void
    {
        if (null === $bootstrapPath) {
            return;
        }

        $possiblePaths = [
            sprintf('%s/%s', $basePath, $bootstrapPath),
            $bootstrapPath,
        ];

        foreach ($possiblePaths as $possiblePath) {
            if (file_exists($possiblePath)) {
                require_once $possiblePath;

                return;
            }
        }

        throw new \DomainException('Could not load bootstrap file.');
    }
}