<?php

namespace App\Controllers;

use App\Managers\LXDProxyManager;
use Psr\Http\Message\ServerRequestInterface as Request;
use Psr\Http\Message\ResponseInterface as Response;
use GuzzleHttp\Client;
use App\Utils\SubdomainHelper;
use App\Services\LxdService;
use App\lib\PCaptcha;

class ProxyController
{
    /**
     * Handles forwarding requests to the appropriate container.
     */
    public function forward(Request $request, Response $response): Response
    {
        $mainDomain = $_ENV['MAIN_DOMAIN'] ?? 'lxdapp.local';

        $origin = $request->getHeaderLine('Origin');
        $domain = parse_url($origin, PHP_URL_HOST); // e.g. mitul.lxdapp.local
        $params = (array)$request->getParsedBody();

        $configPath = __DIR__ . '/../../config.json';
        $config = file_exists($configPath) ? json_decode(file_get_contents($configPath), true) : [];
        $name = $config[$domain] ?? null;

        $lxd = new LxdService();
        // print_r($params);
        // CASE 1: From Login Page – Create if not mapped
        if (isset($params['source']) && $params['source'] === 'login') {
            
            $captcha = new PCaptcha();
        
            if (!$captcha->validate_captcha($params['panswer'])) {
                return $this->json($response, ['status' => 'error', 'error' => 'invalid_captcha']);
            }

            if (!$name) {
                $subdomain = SubdomainHelper::getSubdomain($domain, $mainDomain);
                $name = $this->generateContainerName($subdomain); // or just use subdomain
                $config[$domain] = $name;
                file_put_contents($configPath, json_encode($config, JSON_PRETTY_PRINT));
            }

            if (!$lxd->containerExists($name)) {
                $lxd->createContainerAndWait($name);
                sleep(5);
                //$lxd->startContainer($name);
                $lxd->installPackages($name);
                sleep(5);
            }

            $ip = $lxd->getContainerIP($name);

            if (!$ip) {
                return $this->json($response, [
                    'status' => 'error',
                    'message' => "Failed to get container IP for '$name'"
                ], 500);
            }

            // if (!$lxd->waitForPort($ip, 80, 30)) {
            //     return $this->json($response, ['status' => 'error', 'message' => 'Container not ready'], 500);
            // }

            return $this->json($response, ['status' => 'success', 'ip' => $ip]);
        }

        // CASE 2: Not from login and no mapping
        if (!$name) {
            return $this->json($response, ['status' => 'not-found']);
        }

        // CASE 3: Check if container exists in LXD
        $containerInfo = $lxd->getContainerState($name);
        if (!$containerInfo) {
            return $this->json($response, ['status' => 'not-found']);
        }

        if ($containerInfo['metadata']['status'] !== 'Running') {
            $lxd->startContainer($name);
            sleep(5);
        }

        
        $ip = $lxd->getContainerIP($name);
        // if (!$ip) {
        //     $ip = $lxd->getContainerIP($name);
        // }

        if (!$lxd->waitForPort($ip, 80, 30)) {
            return $this->json($response, ['status' => 'error', 'message' => 'Service not available'], 500);
        }

        return $this->proxyToContainer($request, $response, $ip, $name);
    }

    /**
     * Maps a domain to a container name.
     */
    private function mapDomainToContainer(string $domain): ?string
    {
        $configPath = __DIR__ . '/../../config.json';

        if (!file_exists($configPath)) {
            return null;
        }

        $config = json_decode(file_get_contents($configPath), true);

        return $config[$domain] ?? null;
    }

    /**
     * Sends a JSON response.
     */
    protected function json($response, array $data, int $status = 200)
    {
        $payload = json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);

        $response->getBody()->write($payload);

        return $response
            ->withHeader('Content-Type', 'application/json')
            ->withHeader('Access-Control-Allow-Origin', '*')
            ->withStatus($status);
    }

    /**
     * Generates a sanitized container name based on a subdomain.
     */
    public function generateContainerName(string $subdomain): string
    {
        // Convert to lowercase, remove unsafe characters
        $sanitized = preg_replace('/[^a-z0-9\-]/', '-', strtolower($subdomain));
        
        // Optionally, ensure it's prefixed/suffixed for uniqueness
        return "container-{$sanitized}";
    }

    /**
     * Proxies the request to the container.
     */
    private function proxyToContainer(Request $request, Response $response, string $ip, string $name): Response
    {
        $target = $ip ? "http://$ip:80" : "http://127.0.0.1:3000";

        $client = new Client([
            'http_errors' => false,
            'timeout' => 5,
        ]);

        // Just make a GET request to the base URL
        $forwarded = $client->request('GET', $target);
        
        $this->writeLastAccessLog($name, $target);
        
        // Return the body and status
        $response->getBody()->write((string) $forwarded->getBody());
        return $response
            ->withHeader('Content-Type', 'text/html') // or json if API
            ->withHeader('Access-Control-Allow-Origin', '*')
            ->withStatus($forwarded->getStatusCode());

    }

    /**
     * Logs the last access to a container.
     */
    protected function writeLastAccessLog(string $name, string $uri): void {
        // Dynamically resolve the log directory relative to the current file
        $logDir = realpath(__DIR__ . '/../../public/last-access-logs');

        // If the resolved path doesn't exist (e.g., public dir was missing), create it
        if (!$logDir) {
            $logDir = __DIR__ . '/../../public/last-access-logs';
            if (!file_exists($logDir)) {
                mkdir($logDir, 0777, true);
            }
        }

        $logLine = date("Y-m-d H:i:s") . " : " . $uri . "\n";
        file_put_contents($logDir . '/' . $name . '.txt', $logLine, FILE_APPEND);
    }


}