<?php

namespace NoccyLabs\Mercureact\Http;

use Monolog\Handler\StreamHandler;
use Monolog\Logger;
use NoccyLabs\Mercureact\Broker\TopicManager;
use NoccyLabs\Mercureact\Configuration;
use NoccyLabs\Mercureact\Http\Middleware\ApiHandler;
use NoccyLabs\Mercureact\Http\Middleware\MercureHandler;
use NoccyLabs\Mercureact\Http\Middleware\NotFoundHandler;
use NoccyLabs\Mercureact\Http\Middleware\ResponseMiddleware;
use NoccyLabs\Mercureact\Http\Middleware\SecurityMiddleware;
use NoccyLabs\Mercureact\Http\Middleware\WebSocketHandler;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use React\EventLoop\Loop;
use React\EventLoop\LoopInterface;
use React\Http\HttpServer;
use React\Http\Middleware\LimitConcurrentRequestsMiddleware;
use React\Http\Middleware\RequestBodyBufferMiddleware;
use React\Socket\SecureServer;
use React\Socket\ServerInterface;
use SplObjectStorage;

class Server
{
    private Configuration $config;

    private LoopInterface $loop;

    private ?HttpServer $server = null;

    private SplObjectStorage $webSocketClients;

    private TopicManager $topicManager;

    private Logger $logger;

    /**
     * 
     * 
     */
    public function __construct(Configuration $config, ?Logger $logger, ?LoopInterface $loop=null)
    {
        $this->loop = $loop??Loop::get();

        $this->config = $config;

        $this->logger = $logger ?? new Logger("main");
        if ($logger instanceof Logger) {
            $topicLogger = $logger->withName("broker");
        } else {
            $topicLogger = $this->logger;
        }

        $this->topicManager = new TopicManager($topicLogger);
        $this->loop->addPeriodicTimer(30, function () {
            $this->topicManager->garbageCollect();
        });
        
        $this->webSocketClients = new SplObjectStorage();
    }

    /**
     * 
     * 
     * @return void
     */
    public function listen(ServerInterface $socket): void
    {
        if (!$this->server) {
            $this->server = $this->createHttpServer();
        }

        $this->server->listen($socket);
        $this->logger->info(sprintf(
            "Listening on %s",
            strtr($socket->getAddress(), [ "tcp://"=>"http://", "tls://"=>"https://"])
        ));
    }

    /**
     * 
     * @return HttpServer
     */
    private function createHttpServer(): HttpServer
    {  
        $stack = [];

        $maxConcurrent = $this->config->get("server.limits.max_concurrent", 100);
        $maxRequestBody = $this->config->get("server.limits.max_request_body", 102400);

        $stack[] = new LimitConcurrentRequestsMiddleware($maxConcurrent);
        $stack[] = new RequestBodyBufferMiddleware($maxRequestBody);

        $stack[] = new ResponseMiddleware(
            config: $this->config,
            logger: $this->logger->withName("http"),
        );
        $stack[] = new SecurityMiddleware(
            config: $this->config
        );

        if ($this->config->getEnableWebSockets()) {
            $stack[] = $webSocketHandler = new WebSocketHandler(
                config: $this->config, 
                webSocketClients: $this->webSocketClients, 
                topicManager: $this->topicManager
            );
            $this->logger->warning("The WebSocket support is incomplete and insecure, but enabling it as requested.");
        }

        $stack[] = new MercureHandler(
            config: $this->config,
            topicManager: $this->topicManager
        );

        if ($this->config->get('server.enable_api', true)) {
            $stack[] = new ApiHandler(
                config: $this->config,
                topicManager: $this->topicManager
            );
            $this->logger->info("Enabling the API middleware");
        }

        $stack[] = new NotFoundHandler();

        return new HttpServer(...$stack);
    }


}