<?php
// src/Controllers/AuthController.php
namespace App\Controllers;

use App\Auth\AuthService;
use App\Auth\OIDCProvider;
use App\Models\Tenant;
use App\Models\User;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Slim\Psr7\Response;

class AuthController
{
    private $authService;
    private $tenantModel;
    private $ userModel;

    public function __construct()
    {
        $this->authService = new AuthService();
        $this->tenantModel = new Tenant();
        $this->userModel = new User();
    }

    public function redirectToOIDC(ServerRequestInterface $request, ResponseInterface $response, array $args): ResponseInterface
    {
        $tenant = $request->getAttribute('tenant');
        
        $clientId = $_ENV['OIDC_CLIENT_ID'] ?? '';
        $clientSecret = $_ENV['OIDC_CLIENT_SECRET'] ?? '';
        $redirectUri = $_ENV['OIDC_REDIRECT_URI'] ?? '';
        $providerUrl = $_ENV['OIDC_PROVIDER_URL'] ?? '';
        
        if (empty($clientId) || empty($clientSecret) || empty($redirectUri) || empty($providerUrl)) {
            $response = new Response();
            $response->getBody()->write(json_encode(['error' => 'OIDC configuration not set']));
            return $response->withStatus(500)->withHeader('Content-Type', 'application/json');
        }
        
        // In a full implementation, we would redirect the user to the OIDC provider
        // For now, we'll just return the URL that would be used
        $authUrl = $providerUrl . '/oauth/authorize?' . http_build_query([
            'client_id' => $clientId,
            'redirect_uri' => $redirectUri,
            'response_type' => 'code',
            'scope' => 'openid profile email',
            'state' => bin2hex(random_bytes(16)) // CSRF protection
        ]);
        
        // For this demo, we'll return the URL instead of redirecting
        $result = [
            'redirect_url' => $authUrl,
            'tenant' => $tenant['name'],
            'message' => 'Redirect to OIDC provider'
        ];
        
        $response->getBody()->write(json_encode($result));
        return $response->withHeader('Content-Type', 'application/json');
    }

    public function handleOIDCCallback(ServerRequestInterface $request, ResponseInterface $response, array $args): ResponseInterface
    {
        $tenant = $request->getAttribute('tenant');
        $queryParams = $request->getQueryParams();
        $code = $queryParams['code'] ?? null;
        $state = $queryParams['state'] ?? null;
        
        if (!$code) {
            $response->getBody()->write(json_encode(['error' => 'Authorization code not provided']));
            return $response->withStatus(400)->withHeader('Content-Type', 'application/json');
        }
        
        // In a full implementation, we would:
        // 1. Verify the state parameter for CSRF protection
        // 2. Exchange the authorization code for tokens
        // 3. Use the access token to retrieve user info
        // 4. Create or update the user in our database
        // 5. Generate a local JWT for our application
        
        // For this demo, we'll simulate the process
        $oidcUser = [
            'id' => 'oidc_user_id_' . bin2hex(random_bytes(8)),
            'email' => 'oidc_user@example.com',
            'first_name' => 'OIDC',
            'last_name' => 'User',
            'name' => 'OIDC User'
        ];
        
        // Create or update user in our database
        $userId = $this->authService->createUserFromProvider([
            'id' => $oidcUser['id'],
            'email' => $oidcUser['email'],
            'first_name' => $oidcUser['first_name'],
            'last_name' => $oidcUser['last_name']
        ], 'oidc', $tenant['id']);
        
        // Generate JWT for our application
        $jwt = $this->authService->createJWT([
            'user_id' => $userId,
            'tenant_id' => $tenant['id'],
            'email' => $oidcUser['email']
        ]);
        
        $result = [
            'message' => 'Successfully authenticated via OIDC',
            'user' => [
                'id' => $userId,
                'email' => $oidcUser['email'],
                'first_name' => $oidcUser['first_name'],
                'last_name' => $oidcUser['last_name']
            ],
            'token' => $jwt,
            'tenant' => $tenant['name']
        ];
        
        $response->getBody()->write(json_encode($result));
        return $response->withHeader('Content-Type', 'application/json');
    }

    public function redirectToGoogle(ServerRequestInterface $request, ResponseInterface $response, array $args): ResponseInterface
    {
        $tenant = $request->getAttribute('tenant');
        
        $clientId = $_ENV['GOOGLE_CLIENT_ID'] ?? '';
        $clientSecret = $_ENV['GOOGLE_CLIENT_SECRET'] ?? '';
        $redirectUri = $_ENV['APP_URL'] . '/auth/google/callback';
        
        if (empty($clientId) || empty($clientSecret)) {
            $response = new Response();
            $response->getBody()->write(json_encode(['error' => 'Google OAuth configuration not set']));
            return $response->withStatus(500)->withHeader('Content-Type', 'application/json');
        }
        
        // In a full implementation, we would redirect the user to Google OAuth
        // For now, we'll just return the URL that would be used
        $authUrl = 'https://accounts.google.com/o/oauth2/v2/auth?' . http_build_query([
            'client_id' => $clientId,
            'redirect_uri' => $redirectUri,
            'response_type' => 'code',
            'scope' => 'openid email profile',
            'state' => bin2hex(random_bytes(16)) // CSRF protection
        ]);
        
        // For this demo, we'll return the URL instead of redirecting
        $result = [
            'redirect_url' => $authUrl,
            'tenant' => $tenant['name'],
            'message' => 'Redirect to Google OAuth'
        ];
        
        $response->getBody()->write(json_encode($result));
        return $response->withHeader('Content-Type', 'application/json');
    }

    public function redirectToFacebook(ServerRequestInterface $request, ResponseInterface $response, array $args): ResponseInterface
    {
        $tenant = $request->getAttribute('tenant');
        
        $clientId = $_ENV['FACEBOOK_CLIENT_ID'] ?? '';
        $clientSecret = $_ENV['FACEBOOK_CLIENT_SECRET'] ?? '';
        $redirectUri = $_ENV['APP_URL'] . '/auth/facebook/callback';
        
        if (empty($clientId) || empty($clientSecret)) {
            $response = new Response();
            $response->getBody()->write(json_encode(['error' => 'Facebook OAuth configuration not set']));
            return $response->withStatus(500)->withHeader('Content-Type', 'application/json');
        }
        
        // In a full implementation, we would redirect the user to Facebook OAuth
        // For now, we'll just return the URL that would be used
        $authUrl = 'https://www.facebook.com/v17.0/dialog/oauth?' . http_build_query([
            'client_id' => $clientId,
            'redirect_uri' => $redirectUri,
            'response_type' => 'code',
            'scope' => 'email,public_profile',
            'state' => bin2hex(random_bytes(16)) // CSRF protection
        ]);
        
        // For this demo, we'll return the URL instead of redirecting
        $result = [
            'redirect_url' => $authUrl,
            'tenant' => $tenant['name'],
            'message' => 'Redirect to Facebook OAuth'
        ];
        
        $response->getBody()->write(json_encode($result));
        return $response->withHeader('Content-Type', 'application/json');
    }
}