<?php

declare(strict_types = 1);

/**
 * @author Robert Strutts
 * @copyright (c) 2025, Robert Strutts
 * @license MIT
 */
namespace IOcornerstone\Framework\Http;

use IOcornerstone\Framework\{
    Registry as Reg,
    Console,
};
use IOcornerstone\Framework\Http\{
    App\App,
    HttpContainer,
    Routing\RoutingHandler,
    Routing\Router,
    App\AppHandler,
    Exception\NoRouteProviderFoundException,
    Exception\RouteProviderException,
};
use IOcornerstone\Framework\Middleware\{
    ErrorMiddleware,
    RequestLoggerMiddleware
};
use Psr\Container\ContainerInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;

class Kernel {
    protected ContainerInterface $psrContainer;
    protected array $middleware = [];
    protected array $serviceProviders = [];

    public function __construct() {
        $this->psrContainer = Reg::get('container');
    }

    private function registerRoutes(Router $router): void
    {
        if (! defined("IO_CORNERSTONE_PROJECT")) {
            return; // Running CLI from Framework test script
        }
        if (! class_exists(\Project\Providers\RouteServiceProvider::class)) {
            throw new NoRouteProviderFoundException("Class NOT found: Project\Providers\RouteServiceProvider");
        }
        try {
            $routeProviders = new \Project\Providers\RouteServiceProvider();
        } catch (\Throwable $e) {
            throw new RouteProviderException("Unable to INIT RouteServiceProvider class \r\n" . $e->getMessage());
        }
        if (! method_exists($routeProviders, "register")) {
            throw new NoRouteProviderFoundException("Method NOT found: Project\Providers\RouteServiceProvider::register");
        }
        try {
            $routeProviders->register($router);            
        } catch (\Throwable $e) {
            throw new RouteProviderException("Unable to call register on Route ServiceProvider \r\n" . $e->getMessage());
        }
    }
            
    private function buildKernel()
    {
        $router = new Router();
        $this->registerRoutes($router);
        
        // Get App instance
        $app = $this->psrContainer->get(App::class);
        
        // Create AppHandler with middleware support
        $appHandler = $this->createAppHandler($app);
        
        // Create routing handler
        $routingHandler = new RoutingHandler(
            $router,
            $this->psrContainer,
            $appHandler
        );
        
        // Combine global middleware
        $globalMiddleware = $this->getGlobalMiddleware();
        
        // Add app-specific middleware if any
        $appMiddleware = $app->getMiddleware();
        if (!empty($appMiddleware)) {
            array_splice($globalMiddleware, -1, 0, $appMiddleware);
        }
        
        return new MiddlewareQueueHandler(
            $globalMiddleware,
            $routingHandler
        );
    }

    private function createAppHandler(App $app): RequestHandlerInterface
    {
        return new AppHandler($app);
    }
    
    private function getGlobalMiddleware(): array
    {
        return [
            $this->psrContainer->get(ErrorMiddleware::class),
            $this->psrContainer->get(RequestLoggerMiddleware::class),
        ];
    }
    
    private function dispatch($kernel): Response
    {
        $httpFactory = new HttpFactory();
        if (Console::isConsole()) {
            $createPsr7Request = $httpFactory->createCliRequest();
        } else {
            $createPsr7Request = $httpFactory->createServerRequestFromGlobals();
        }
        return $kernel->handle($createPsr7Request);
    }

    private function emit(Response $response): void
    {
        if (! Console::isConsole()) {
            http_response_code($response->getStatusCode());
        }
        foreach ($response->getHeaders() as $name => $values) {
            if (! is_array($values) && ! is_object($values)) {
                header("$name: $values", false);
                continue;
            }
            foreach ($values as $value) {
                header("$name: $value", false);
            }
        }
        if (function_exists('session_status') && session_status() == PHP_SESSION_ACTIVE) {
            session_write_close();
        }
        echo $response->getBody();
    }

    public function run(): void {
        $kernel = $this->buildKernel();
        $response = $this->dispatch($kernel);
        $this->emit($response);
    }
}

//dd($createPsr7Request->getQueryParams()['name']);
//dd($createPsr7Request->getVar()->get("name"));