<?php

class ApiManager {
    public function generateToken($username, $password){
        $userManager = new UserManager();
        if ($username != '' || $password != ''){               
            $userLogedIn = $userManager->loginNew($username, $password);
                
            if ($userLogedIn != false){
                // Create token header as a JSON string
                $header = json_encode(['typ' => 'JWT', 'alg' => 'HS256']);
                // Create token payload as a JSON string
                $payload = json_encode(['user_id' => $userLogedIn]);
                // Encode Header to Base64Url String
                $base64UrlHeader = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($header));
                // Encode Payload to Base64Url String
                $base64UrlPayload = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($payload));
                // Create Signature Hash
                $signature = hash_hmac('sha256', $base64UrlHeader . "." . $base64UrlPayload, 'abC123!', true);
                // Encode Signature to Base64Url String
                $base64UrlSignature = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($signature));
                // Create JWT
                $jwt = $base64UrlHeader . "." . $base64UrlPayload . "." . $base64UrlSignature;
                
                return $jwt;
            }
        }
        return false;
    }
}