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<?php

declare(strict_types=1);

namespace Laminas\Router;

use Laminas\ServiceManager\AbstractPluginManager;
use Laminas\ServiceManager\ConfigInterface;
use Laminas\ServiceManager\Exception\InvalidServiceException;
use Laminas\ServiceManager\ServiceManager;
use Psr\Container\ContainerInterface;

use function array_merge;
use function gettype;
use function is_object;
use function sprintf;

/**
 * Plugin manager implementation for routes
 *
 * Enforces that routes retrieved are instances of RouteInterface. It overrides
 * configure() to map invokables to the component-specific
 * RouteInvokableFactory.
 *
 * The manager is marked to not share by default, in order to allow multiple
 * route instances of the same type.
 *
 * @see ServiceManager for expected configuration shape
 *
 * @template InstanceType of RouteInterface
 * @extends AbstractPluginManager<InstanceType>
 * @psalm-import-type ServiceManagerConfiguration from ServiceManager
 */
class RoutePluginManager extends AbstractPluginManager
{
    /**
     * Only RouteInterface instances are valid
     *
     * @var class-string
     */
    protected $instanceOf = RouteInterface::class;

    /**
     * Do not share instances. (v3)
     *
     * @var bool
     */
    protected $shareByDefault = false;

    /**
     * Do not share instances. (v2)
     *
     * @var bool
     */
    protected $sharedByDefault = false;

    /**
     * Constructor
     *
     * Ensure that the instance is seeded with the RouteInvokableFactory as an
     * abstract factory.
     *
     * @param ContainerInterface|ConfigInterface $configOrContainerInstance
     * @param array $v3config
     * @psalm-param ServiceManagerConfiguration $v3config
     */
    public function __construct($configOrContainerInstance, array $v3config = [])
    {
        $this->addAbstractFactory(RouteInvokableFactory::class);
        parent::__construct($configOrContainerInstance, $v3config);
    }

    /**
     * Validate a route plugin. (v2)
     *
     * @throws InvalidServiceException
     * @psalm-assert InstanceType $instance
     */
    public function validate(mixed $instance)
    {
        if (! $instance instanceof $this->instanceOf) {
            throw new InvalidServiceException(sprintf(
                'Plugin of type %s is invalid; must implement %s',
                is_object($instance) ? $instance::class : gettype($instance),
                RouteInterface::class
            ));
        }
    }

    /**
     * Validate a route plugin. (v2)
     *
     * @param InstanceType $plugin
     * @throws Exception\RuntimeException
     * @psalm-assert InstanceType $instance
     */
    public function validatePlugin($plugin)
    {
        try {
            $this->validate($plugin);
        } catch (InvalidServiceException $e) {
            throw new Exception\RuntimeException(
                $e->getMessage(),
                $e->getCode(),
                $e
            );
        }
    }

    /**
     * Pre-process configuration. (v3)
     *
     * Checks for invokables, and, if found, maps them to the
     * component-specific RouteInvokableFactory; removes the invokables entry
     * before passing to the parent.
     *
     * @param array $config
     * @psalm-param ServiceManagerConfiguration $config
     * @return $this
     */
    public function configure(array $config)
    {
        if (isset($config['invokables']) && ! empty($config['invokables'])) {
            $aliases   = $this->createAliasesForInvokables($config['invokables']);
            $factories = $this->createFactoriesForInvokables($config['invokables']);

            if (! empty($aliases)) {
                $config['aliases'] = isset($config['aliases'])
                    ? array_merge($config['aliases'], $aliases)
                    : $aliases;
            }

            $config['factories'] = isset($config['factories'])
                ? array_merge($config['factories'], $factories)
                : $factories;

            unset($config['invokables']);
        }

        parent::configure($config);

        return $this;
    }

     /**
      * Create aliases for invokable classes.
      *
      * If an invokable service name does not match the class it maps to, this
      * creates an alias to the class (which will later be mapped as an
      * invokable factory).
      *
      * @param array<string, class-string> $invokables
      * @return array<string, class-string>
      */
    protected function createAliasesForInvokables(array $invokables)
    {
        $aliases = [];
        foreach ($invokables as $name => $class) {
            if ($name === $class) {
                continue;
            }
            $aliases[$name] = $class;
        }
        return $aliases;
    }

    /**
     * Create invokable factories for invokable classes.
     *
     * If an invokable service name does not match the class it maps to, this
     * creates an invokable factory entry for the class name; otherwise, it
     * creates an invokable factory for the entry name.
     *
     * @param array<string, class-string> $invokables
     * @return array<class-string, class-string>
     */
    protected function createFactoriesForInvokables(array $invokables)
    {
        $factories = [];
        foreach ($invokables as $name => $class) {
            if ($name === $class) {
                $factories[$name] = RouteInvokableFactory::class;
                continue;
            }

            $factories[$class] = RouteInvokableFactory::class;
        }
        return $factories;
    }
}