class Router

class Router implements RouterInterface, RequestMatcherInterface {
    protected UrlMatcherInterface|RequestMatcherInterface $matcher;
    protected UrlGeneratorInterface $generator;
    protected RequestContext $context;
    protected RouteCollection $collection;
    protected array $options = [];
    private ConfigCacheFactoryInterface $configCacheFactory;
    
    /**
     * @var ExpressionFunctionProviderInterface[]
     */
    private array $expressionLanguageProviders = [];
    private static ?array $cache = [];
    public function __construct(LoaderInterface $loader, mixed $resource, array $options = [], ?RequestContext $context = null, ?LoggerInterface $logger = null, ?string $defaultLocale = null) {
        $this->context = $context ?? new RequestContext();
        $this->setOptions($options);
    }
    
    /**
     * Sets options.
     *
     * Available options:
     *
     *   * cache_dir:              The cache directory (or null to disable caching)
     *   * debug:                  Whether to enable debugging or not (false by default)
     *   * generator_class:        The name of a UrlGeneratorInterface implementation
     *   * generator_dumper_class: The name of a GeneratorDumperInterface implementation
     *   * matcher_class:          The name of a UrlMatcherInterface implementation
     *   * matcher_dumper_class:   The name of a MatcherDumperInterface implementation
     *   * resource_type:          Type hint for the main resource (optional)
     *   * strict_requirements:    Configure strict requirement checking for generators
     *                             implementing ConfigurableRequirementsInterface (default is true)
     *
     * @throws \InvalidArgumentException When unsupported option is provided
     */
    public function setOptions(array $options) : void {
        $this->options = [
            'cache_dir' => null,
            'debug' => false,
            'generator_class' => CompiledUrlGenerator::class,
            'generator_dumper_class' => CompiledUrlGeneratorDumper::class,
            'matcher_class' => CompiledUrlMatcher::class,
            'matcher_dumper_class' => CompiledUrlMatcherDumper::class,
            'resource_type' => null,
            'strict_requirements' => true,
        ];
        // check option names and live merge, if errors are encountered Exception will be thrown
        $invalid = [];
        foreach ($options as $key => $value) {
            if (\array_key_exists($key, $this->options)) {
                $this->options[$key] = $value;
            }
            else {
                $invalid[] = $key;
            }
        }
        if ($invalid) {
            throw new \InvalidArgumentException(\sprintf('The Router does not support the following options: "%s".', implode('", "', $invalid)));
        }
    }
    
    /**
     * Sets an option.
     *
     * @throws \InvalidArgumentException
     */
    public function setOption(string $key, mixed $value) : void {
        if (!\array_key_exists($key, $this->options)) {
            throw new \InvalidArgumentException(\sprintf('The Router does not support the "%s" option.', $key));
        }
        $this->options[$key] = $value;
    }
    
    /**
     * Gets an option value.
     *
     * @throws \InvalidArgumentException
     */
    public function getOption(string $key) : mixed {
        if (!\array_key_exists($key, $this->options)) {
            throw new \InvalidArgumentException(\sprintf('The Router does not support the "%s" option.', $key));
        }
        return $this->options[$key];
    }
    public function getRouteCollection() : RouteCollection {
        return $this->collection ??= $this->loader
            ->load($this->resource, $this->options['resource_type']);
    }
    public function setContext(RequestContext $context) : void {
        $this->context = $context;
        if (isset($this->matcher)) {
            $this->getMatcher()
                ->setContext($context);
        }
        if (isset($this->generator)) {
            $this->getGenerator()
                ->setContext($context);
        }
    }
    public function getContext() : RequestContext {
        return $this->context;
    }
    
    /**
     * Sets the ConfigCache factory to use.
     */
    public function setConfigCacheFactory(ConfigCacheFactoryInterface $configCacheFactory) : void {
        $this->configCacheFactory = $configCacheFactory;
    }
    public function generate(string $name, array $parameters = [], int $referenceType = self::ABSOLUTE_PATH) : string {
        return $this->getGenerator()
            ->generate($name, $parameters, $referenceType);
    }
    public function match(string $pathinfo) : array {
        return $this->getMatcher()
            ->match($pathinfo);
    }
    public function matchRequest(Request $request) : array {
        $matcher = $this->getMatcher();
        if (!$matcher instanceof RequestMatcherInterface) {
            // fallback to the default UrlMatcherInterface
            return $matcher->match($request->getPathInfo());
        }
        return $matcher->matchRequest($request);
    }
    
    /**
     * Gets the UrlMatcher or RequestMatcher instance associated with this Router.
     */
    public function getMatcher() : UrlMatcherInterface|RequestMatcherInterface {
        if (isset($this->matcher)) {
            return $this->matcher;
        }
        if (null === $this->options['cache_dir']) {
            $routes = $this->getRouteCollection();
            $compiled = is_a($this->options['matcher_class'], CompiledUrlMatcher::class, true);
            if ($compiled) {
                $routes = (new CompiledUrlMatcherDumper($routes))->getCompiledRoutes();
            }
            $this->matcher = new $this->options['matcher_class']($routes, $this->context);
            if (method_exists($this->matcher, 'addExpressionLanguageProvider')) {
                foreach ($this->expressionLanguageProviders as $provider) {
                    $this->matcher
                        ->addExpressionLanguageProvider($provider);
                }
            }
            return $this->matcher;
        }
        $cache = $this->getConfigCacheFactory()
            ->cache($this->options['cache_dir'] . '/url_matching_routes.php', function (ConfigCacheInterface $cache) {
            $dumper = $this->getMatcherDumperInstance();
            if (method_exists($dumper, 'addExpressionLanguageProvider')) {
                foreach ($this->expressionLanguageProviders as $provider) {
                    $dumper->addExpressionLanguageProvider($provider);
                }
            }
            $cache->write($dumper->dump(), $this->getRouteCollection()
                ->getResources());
            unset(self::$cache[$cache->getPath()]);
        });
        return $this->matcher = new $this->options['matcher_class'](self::getCompiledRoutes($cache->getPath()), $this->context);
    }
    
    /**
     * Gets the UrlGenerator instance associated with this Router.
     */
    public function getGenerator() : UrlGeneratorInterface {
        if (isset($this->generator)) {
            return $this->generator;
        }
        if (null === $this->options['cache_dir']) {
            $routes = $this->getRouteCollection();
            $compiled = is_a($this->options['generator_class'], CompiledUrlGenerator::class, true);
            if ($compiled) {
                $generatorDumper = new CompiledUrlGeneratorDumper($routes);
                $routes = array_merge($generatorDumper->getCompiledRoutes(), $generatorDumper->getCompiledAliases());
            }
            $this->generator = new $this->options['generator_class']($routes, $this->context, $this->logger, $this->defaultLocale);
        }
        else {
            $cache = $this->getConfigCacheFactory()
                ->cache($this->options['cache_dir'] . '/url_generating_routes.php', function (ConfigCacheInterface $cache) {
                $dumper = $this->getGeneratorDumperInstance();
                $cache->write($dumper->dump(), $this->getRouteCollection()
                    ->getResources());
                unset(self::$cache[$cache->getPath()]);
            });
            $this->generator = new $this->options['generator_class'](self::getCompiledRoutes($cache->getPath()), $this->context, $this->logger, $this->defaultLocale);
        }
        if ($this->generator instanceof ConfigurableRequirementsInterface) {
            $this->generator
                ->setStrictRequirements($this->options['strict_requirements']);
        }
        return $this->generator;
    }
    public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider) : void {
        $this->expressionLanguageProviders[] = $provider;
    }
    protected function getGeneratorDumperInstance() : GeneratorDumperInterface {
        return new $this->options['generator_dumper_class']($this->getRouteCollection());
    }
    protected function getMatcherDumperInstance() : MatcherDumperInterface {
        return new $this->options['matcher_dumper_class']($this->getRouteCollection());
    }
    
    /**
     * Provides the ConfigCache factory implementation, falling back to a
     * default implementation if necessary.
     */
    private function getConfigCacheFactory() : ConfigCacheFactoryInterface {
        return $this->configCacheFactory ??= new ConfigCacheFactory($this->options['debug']);
    }
    private static function getCompiledRoutes(string $path) : array {
        if ([] === self::$cache && \function_exists('opcache_invalidate') && filter_var(\ini_get('opcache.enable'), \FILTER_VALIDATE_BOOL) && (!\in_array(\PHP_SAPI, [
            'cli',
            'phpdbg',
            'embed',
        ], true) || filter_var(\ini_get('opcache.enable_cli'), \FILTER_VALIDATE_BOOL))) {
            self::$cache = null;
        }
        if (null === self::$cache) {
            return require $path;
        }
        return self::$cache[$path] ??= (require $path);
    }

}