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<?php

declare(strict_types=1);

namespace Drush\Runtime;

use Composer\Autoload\ClassLoader;
use Consolidation\AnnotatedCommand\CommandFileDiscovery;
use Consolidation\AnnotatedCommand\Events\CustomEventAwareInterface;
use Consolidation\AnnotatedCommand\Input\StdinAwareInterface;
use Consolidation\Filter\Hooks\FilterHooks;
use Consolidation\SiteAlias\SiteAliasManagerAwareInterface;
use Consolidation\SiteProcess\ProcessManagerAwareInterface;
use Drupal\Component\DependencyInjection\ContainerInterface as DrupalContainer;
use DrupalCodeGenerator\Command\BaseGenerator;
use Drush\Attributes\Bootstrap;
use Drush\Boot\DrupalBootLevels;
use Drush\Commands\DrushCommands;
use Drush\Config\DrushConfig;
use Grasmash\YamlCli\Command\GetValueCommand;
use Grasmash\YamlCli\Command\LintCommand;
use Grasmash\YamlCli\Command\UnsetKeyCommand;
use Grasmash\YamlCli\Command\UpdateKeyCommand;
use Grasmash\YamlCli\Command\UpdateValueCommand;
use Psr\Container\ContainerInterface as DrushContainer;
use Psr\Log\LoggerInterface;
use Robo\ClassDiscovery\RelativeNamespaceDiscovery;
use Robo\Contract\ConfigAwareInterface;
use Robo\Contract\OutputAwareInterface;
use Symfony\Component\Console\Input\InputAwareInterface;

/**
 * Manage Drush services.
 *
 * This class manages the various services / plugins supported by Drush.
 * The primary examples of these include:
 *
 *   - Command files
 *   - Hooks
 *   - Symfony Console commands
 *   - Command info alterers
 *   - Generators
 *
 * Most services are discovered via the PSR-4 discovery mechanism. Legacy
 * services are injected into this object by the bootstrap handler
 * (DrushBoot8) using the LegacyServiceFinder and LegacyServiceInstantiator
 * classes.
 */
class ServiceManager
{
    /** @var string[] */
    protected array $bootstrapCommandClasses = [];

    public function __construct(
        protected ClassLoader $autoloader,
        protected DrushConfig $config,
        protected LoggerInterface $logger
    ) {
    }

    /**
     * Ensure that any discovered class that is not part of the autoloader
     * is, in fact, included.
     *
     * @param array Associative array mapping path => class.
     */
    protected function loadCommandClasses(array $commandClasses): void
    {
        foreach ($commandClasses as $file => $commandClass) {
            if (!class_exists($commandClass)) {
                include $file;
            }
        }
    }

    /**
     * Return cached of deferred commandhander objects.
     *
     * @return string[]
     *   List of class names to instantiate at bootstrap time.
     */
    public function bootstrapCommandClasses(): array
    {
        return $this->bootstrapCommandClasses;
    }

    /**
     * Discover all of the different kinds of command handler objects
     * in the places where Drush can find them. Called during preflight;
     * some command classes are returned right away, and others are saved
     * to be handled later during Drupal bootstrap.
     *
     * @param string[] $commandfileSearchpath List of directories to search
     * @param string $baseNamespace The namespace to use at the base of each
     *   search diretory. Namespace components mirror directory structure.
     *
     * @return string[]
     *   List of command classes
     */
    public function discover(array $commandfileSearchpath, string $baseNamespace): array
    {
        $commandClasses = array_unique(array_merge(
            $this->discoverCommandsFromConfiguration(),
            $this->discoverCommands($commandfileSearchpath, '\Drush'),
            $this->discoverPsr4Commands(),
            [FilterHooks::class]
        ));

        // If a command class has a Bootstrap Attribute or `static` create factory,
        // postpone instantiating it until after we bootstrap Drupal.
        $this->bootstrapCommandClasses = array_filter($commandClasses, [$this, 'requiresBootstrap']);

        // Remove the command classes that we put into the bootstrap command classes.
        $commandClasses = array_diff($commandClasses, $this->bootstrapCommandClasses);

        return $commandClasses;
    }

    /**
     * Discover commands explicitly declared in configuration.
     *
     * @return string[]
     *   List of command classes
     */
    public function discoverCommandsFromConfiguration(): array
    {
        $commandList = [];
        foreach ($this->config->get('drush.commands', []) as $key => $value) {
            if (is_numeric($key)) {
                $classname = $value;
                $commandList[] = $classname;
            } else {
                $classname = ltrim($key, '\\');
                $commandList[$value] = $classname;
            }
        }
        $this->loadCommandClasses($commandList);
        return array_values($commandList);
    }

    /**
     * Discovers command classes from a provided search path.
     *
     * @param string[] $directoryList List of directories to search
     * @param string $baseNamespace The namespace to use at the base of each
     *   search directory. Namespace components mirror directory structure.
     *
     * @return string[]
     *   List of command classes
     */
    public function discoverCommands(array $directoryList, string $baseNamespace): array
    {
        $discovery = new CommandFileDiscovery();
        $discovery
            ->setIncludeFilesAtBase(true)
            ->setSearchDepth(3)
            ->ignoreNamespacePart('contrib', 'Commands')
            ->ignoreNamespacePart('custom', 'Commands')
            ->ignoreNamespacePart('src')
            ->setSearchLocations(['Commands', 'Hooks', 'Generators'])
            ->setSearchPattern('#.*(Command|Hook|Generator)s?.php$#');
        $baseNamespace = ltrim($baseNamespace, '\\');
        $commandClasses = $discovery->discover($directoryList, $baseNamespace);
        $this->loadCommandClasses($commandClasses);
        return array_values($commandClasses);
    }

    /**
     * Discover PSR-4 autoloaded classes that implement Annotated Command
     * library command handlers.
     *
     * @return string[]
     *   List of command classes
     */
    public function discoverPsr4Commands(): array
    {
        $classes = (new RelativeNamespaceDiscovery($this->autoloader))
            ->setRelativeNamespace('Drush\Commands')
            ->setSearchPattern('/.*DrushCommands\.php$/')
            ->getClasses();

        return array_filter($classes, function (string $class): bool {
            $reflectionClass = new \ReflectionClass($class);
            return $reflectionClass->isSubclassOf(DrushCommands::class)
                && !$reflectionClass->isAbstract()
                && !$reflectionClass->isInterface()
                && !$reflectionClass->isTrait();
        });
    }

    /**
     * Discover PSR-4 autoloaded classes that implement DCG generators.
     *
     * @return string[]
     *   List of generator classes
     */
    public function discoverPsr4Generators(): array
    {
        $classes = (new RelativeNamespaceDiscovery($this->autoloader))
            ->setRelativeNamespace('Drush\Generators')
            ->setSearchPattern('/.*Generator\.php$/')
            ->getClasses();

        return array_filter($classes, function (string $class): bool {
            try {
                $reflectionClass = new \ReflectionClass($class);
            } catch (\Throwable $e) {
                return false;
            }
            return $reflectionClass->isSubclassOf(BaseGenerator::class)
                && !$reflectionClass->isAbstract()
                && !$reflectionClass->isInterface()
                && !$reflectionClass->isTrait();
        });
    }

    /**
     * Discover module commands. This is the preferred way to find module
     * commands in Drush 12+.
     *
     * @return string[]
     *   List of command classes
     */
    public function discoverModuleCommands(array $directoryList, string $baseNamespace): array
    {
        $discovery = new CommandFileDiscovery();
        $discovery
            ->setIncludeFilesAtBase(true)
            ->setSearchDepth(1)
            ->ignoreNamespacePart('src')
            ->setSearchLocations(['Commands', 'Hooks'])
            ->setSearchPattern('#.*(Command|Hook)s?.php$#');
        $baseNamespace = ltrim($baseNamespace, '\\');
        $commandClasses = $discovery->discover($directoryList, $baseNamespace);
        return array_values($commandClasses);
    }

    /**
     * Discover command info alterers in modules.
     *
     * @param string[] $directoryList List of directories to search
     * @param string $baseNamespace The namespace to use at the base of each
     *   search directory. Namespace components mirror directory structure.
     *
     * @return string[]
     */
    public function discoverModuleCommandInfoAlterers(array $directoryList, string $baseNamespace): array
    {
        $discovery = new CommandFileDiscovery();
        $discovery
            ->setIncludeFilesAtBase(true)
            ->setSearchDepth(1)
            ->ignoreNamespacePart('src')
            ->setSearchLocations(['CommandInfoAlterers'])
            ->setSearchPattern('#.*CommandInfoAlterer.php$#');
        $baseNamespace = ltrim($baseNamespace, '\\');
        $commandClasses = $discovery->discover($directoryList, $baseNamespace);
        return array_values($commandClasses);
    }

    /**
     * Instantiate commands from Grasmash\YamlCli that we want to expose
     * as Drush commands.
     *
     * @return Command[]
     *   List of Symfony Command objects
     */
    public function instantiateYamlCliCommands(): array
    {
        $classes_yaml = [
            GetValueCommand::class,
            LintCommand::class,
            UpdateKeyCommand::class,
            UnsetKeyCommand::class,
            UpdateValueCommand::class
        ];

        foreach ($classes_yaml as $class_yaml) {
            /** @var Command $instance */
            $instance = new $class_yaml();
            // Namespace the commands.
            $name = $instance->getName();
            $instance->setName('yaml:' . $name);
            $instance->setAliases(['y:' . $name]);
            $instance->setHelp('See https://github.com/grasmash/yaml-cli for a README and bug reports.');
            $instances[] = $instance;
        }
        return $instances;
    }

    /**
     * Instantiate objects given a lsit of classes. For each class, if it has
     * a static `create` factory, use that to instantiate it, passing both the
     * Drupal and Drush DI containers. If there is no static factory, then
     * instantiate it via 'new $class'
     *
     * @param string[] $bootstrapCommandClasses Classes to instantiate.
     * @param Drupal\Component\DependencyInjection\ContainerInterface $container
     * @param Psr\Container\ContainerInterface $drushContainer
     *
     * @return object[]
     *   List of instantiated service objects
     */
    public function instantiateServices(array $bootstrapCommandClasses, DrushContainer $drushContainer, ?DrupalContainer $container = null): array
    {
        $commandHandlers = [];

        // Remove any abstract classes found via discovery, most
        // particularly DrushCommands (our abstract base class).
        // n.b. we cannot simply use 'isInstantiable' here because
        // the constructor is typically protected when using a static create method
        $bootstrapCommandClasses = array_filter($bootstrapCommandClasses, function ($class) {
            $reflection = new \ReflectionClass($class);
            return !$reflection->isAbstract();
        });

        // Prevent duplicate calls to delegate() by checking for state.
        if ($container && !$drushContainer->has('state')) {
            $drushContainer->delegate($container);
        }
        foreach ($bootstrapCommandClasses as $class) {
            $commandHandler = null;

            try {
                if ($this->hasStaticCreateFactory($class) && $this->supportsCompoundContainer($class, $drushContainer)) {
                    // Hurray, this class is compatible with the container with delegate.
                    $commandHandler = $class::create($drushContainer);
                } elseif ($container && $this->hasStaticCreateFactory($class)) {
                    $commandHandler = $class::create($container, $drushContainer);
                } elseif (!$container && $this->hasStaticCreateEarlyFactory($class)) {
                    $commandHandler = $class::createEarly($drushContainer);
                } else {
                    $commandHandler = new $class();
                }

                // Inject any additional dependencies needed by any
                // "*AwareInterface" used by the handler
                $this->inflect($drushContainer, $commandHandler);
                $commandHandlers[] = $commandHandler;
            } catch (\Throwable $e) {
                $this->logger->debug("Could not instantiate {class}: {message}", ['class' => $class, 'message' => $e->getMessage()]);
            }
        }

        return $commandHandlers;
    }

    /**
     * Determine if the first parameter of the create method supports our container with delegate.
     */
    protected function supportsCompoundContainer($class, $drush_container): bool
    {
        $reflection = new \ReflectionMethod($class, 'create');
        $hint = (string)$reflection->getParameters()[0]->getType();
        return is_a($drush_container, $hint);
    }

    /**
     * Check to see if the provided class has a static `create` method.
     *
     * @param string $class The name of the class to check
     *
     * @return bool
     *   True if class has a static `create` method.
     */
    protected function hasStaticCreateFactory(string $class): bool
    {
        return static::hasStaticMethod($class, 'create');
    }

    /*
     * Get any value for the #[Bootstrap] Attribute on the class.
     */
    protected function bootStrapAttributeValue(string $class): ?int
    {
        try {
            $reflection = new \ReflectionClass($class);
            if ($attributes = $reflection->getAttributes(Bootstrap::class)) {
                $bootstrap = $attributes[0]->newInstance();
                return $bootstrap->level;
            }
        } catch (\ReflectionException $e) {
        }
        return null;
    }

    /**
     * Check whether a command class requires Drupal bootstrap.
     */
    protected function requiresBootstrap(string $class): bool
    {
        if ($this->bootStrapAttributeValue($class) === DrupalBootLevels::FULL) {
            return true;
        } elseif ($this->bootStrapAttributeValue($class) === DrupalBootLevels::NONE) {
            return false;
        }
        return $this->hasStaticCreateFactory($class);
    }

    /**
     * Check to see if the provided class has a static `createEarly` method.
     *
     * @param string $class The name of the class to check
     *
     * @return bool
     *   True if class has a static `createEarly` method.
     */
    protected function hasStaticCreateEarlyFactory(string $class): bool
    {
        return static::hasStaticMethod($class, 'createEarly');
    }

    /**
     * Check to see if the provided class has the specified static method.
     *
     * @param string $class The name of the class to check
     * @param string $methodName The name of the method the class should have
     *
     * @return bool
     *   True if class has a static method with the specified name.
     */
    protected function hasStaticMethod(string $class, string $methodName): bool
    {
        if (!method_exists($class, $methodName)) {
            return false;
        }

        $reflectionMethod = new \ReflectionMethod($class, $methodName);
        return $reflectionMethod->isStatic();
    }

    /**
     * Return generators that ship in modules.
     *
     * @return string[]
     *   List of generator classes
     */
    public function discoverModuleGenerators(array $directoryList, string $baseNamespace): array
    {
        $discovery = new CommandFileDiscovery();
        $discovery
            ->setIncludeFilesAtBase(true)
            ->setSearchDepth(1)
            ->ignoreNamespacePart('src')
            ->setSearchLocations(['Generators'])
            ->setSearchPattern('#.*(Generator)s?.php$#');
        $baseNamespace = ltrim($baseNamespace, '\\');
        $commandClasses = $discovery->discover($directoryList, $baseNamespace);
        return array_values($commandClasses);
    }

    /**
     * Inject any dependencies needed via the "*AwareInterface" pattern
     *
     * @param DrushContainer $container The DI contaner
     * @param mixed $object The object to be inflected
     */
    public function inflect(DrushContainer $container, $object): void
    {
        // Commonly used services
        if ($object instanceof ConfigAwareInterface) {
            $object->setConfig($container->get('config'));
        }
        if (method_exists($object, 'setLoggerIfEmpty')) {
            $object->setLoggerIfEmpty($container->get('logger'));
        }
        // Made available by DrushCommands (must preserve for basic bc)
        if ($object instanceof ProcessManagerAwareInterface) {
            $object->setProcessManager($container->get('process.manager'));
        }
        // InputAwareInterface and OutputAwareInterface are needed by
        // the Robo IO trait that saves and restores input/output state,
        // so they must be maintained until that system is retired.
        if ($object instanceof InputAwareInterface) {
            $object->setInput($container->get('input'));
        }
        if ($object instanceof OutputAwareInterface) {
            $object->setOutput($container->get('output'));
        }
        // These may be removed in future versions of Drush
        if ($object instanceof SiteAliasManagerAwareInterface) {
            $object->setSiteAliasManager($container->get('site.alias.manager'));
        }
        if ($object instanceof StdinAwareInterface) {
            $object->setStdinHandler($container->get('stdinHandler'));
        }
        if ($object instanceof CustomEventAwareInterface) {
            $object->setHookManager($container->get('hookManager'));
        }
    }
}