<?php

/**
 * Send OTP Email Library
 * Generates and sends a one-time password via email for two-factor authentication
 */
class SendOtpEmail
{
    private $user;
    private $otpCode;
    private $sendResult = false;

    public function __construct($user)
    {
        $this->user = $user;
        $this->handle();
    }

    /**
     * Get the result of the email send operation
     * @return bool True if email was sent successfully
     */
    public function getSendResult()
    {
        return $this->sendResult;
    }

    /**
     * Get the generated OTP code (for testing purposes)
     * @return string The OTP code
     */
    public function getOtpCode()
    {
        return $this->otpCode;
    }

    /**
     * Main handler for OTP email process
     */
    private function handle()
    {
        $this->generateOTP();
        $this->sendOTPEmail();
    }

    /**
     * Generate a new OTP code
     */
    private function generateOTP()
    {
        // Generate OTP valid for 10 minutes
        $this->otpCode = \UserOtp_model::generateOTP($this->user->id, 10);
    }

    /**
     * Send the OTP code via email
     */
    private function sendOTPEmail()
    {
        $email = \Config\Services::email();

        // Build email configuration directly from environment variables
        $config = [
            'protocol'   => str_replace(',', '', $_ENV['PROTOCOL'] ?? 'smtp'),
            'SMTPHost'   => str_replace(',', '', $_ENV['SMTP_HOST'] ?? ''),
            'SMTPUser'   => str_replace(',', '', $_ENV['SMTP_USER'] ?? ''),
            'SMTPPass'   => str_replace(',', '', $_ENV['SMTP_PASS'] ?? ''),
            'SMTPPort'   => (int) str_replace(',', '', $_ENV['SMTP_PORT'] ?? 25),
            'SMTPCrypto' => 'tls',
            'SMTPTimeout' => 30,
            'charset'    => 'UTF-8',
            'mailType'   => 'html',
            'newline'    => "\r\n",
            'CRLF'       => "\r\n",
            'wordWrap'   => true,
        ];

        $email->initialize($config);

        $data = [
            'username'   => $this->user->username,
            'firstname'  => $this->user->firstname,
            'middlename' => $this->user->middlename,
            'lastname'   => $this->user->lastname,
            'otp_code'   => $this->otpCode
        ];

        $html = view('emails/twofactor_otp_email', ['user' => $data]);

        $email->setFrom('noreply@dbois.nl', 'DBOIS');
        $email->setTo($this->user->email);
        $email->setSubject('DBOIS Tweefactorauthenticatie - Verificatiecode');
        $email->setMessage($html);

        $this->sendResult = $email->send();

        if (!$this->sendResult) {
            log_message('error', 'Failed to send 2FA OTP email to ' . $this->user->email . ': ' . $email->printDebugger());
        }
    }
}