backend-php/controllers/RegisterController.php

<?php

namespace Controllers;

use Libs\ResponseLib;
use Models\UserModel;
use Psr\Http\Message\ServerRequestInterface;

class RegisterController
{
    public function __invoke(ServerRequestInterface $request)
    {
        $body = json_decode((string) $request->getBody(), true);
        
        $required = [
            'username','email','password','phone','address','city','state','zip','country',
            'kyc','birthdate','cpf','company_id','role_id'
        ];
        foreach ($required as $field) {
            if (!isset($body[$field]) || $body[$field] === '') {
                return ResponseLib::sendFail("Missing field: $field", [], "E_VALIDATE")->withStatus(400);
            }
        }

        if (!filter_var($body['email'], FILTER_VALIDATE_EMAIL)) {
            return ResponseLib::sendFail("Invalid email format", [], "E_VALIDATE")->withStatus(400);
        }

        if (strlen($body['password']) < 8) {
            return ResponseLib::sendFail("Password must be at least 8 characters", [], "E_VALIDATE")->withStatus(400);
        }

        $userModel = new UserModel();
        $userData = $userModel->createUser($body);

        if (!$userData) {
            return ResponseLib::sendFail("Email already exists or creation failed", [], "E_VALIDATE")->withStatus(400);
        }

        return ResponseLib::sendOk($userData, "S_CREATED");
    }
}