
<?php
header('Content-Type: application/json');
$action = $_POST['action'] ?? $_GET['action'] ?? '';
switch ($action) {
    case 'encode':
        $text = $_POST['text'] ?? $_GET['text'] ?? '';
        echo json_encode(['original' => $text, 'base64' => '=?UTF-8?B?' . base64_encode($text) . '?=']);
        break;
    case 'build':
        $from = $_POST['from_name'] ?? 'Sender';
        $email = $_POST['from_email'] ?? 'sender@example.com';
        $subject = $_POST['subject'] ?? 'No Subject';
        $headers = [
            "From: =?UTF-8?B?" . base64_encode($from) . "?= <$email>",
            "Subject: =?UTF-8?B?" . base64_encode($subject) . "?=",
            "MIME-Version: 1.0",
            "Content-Type: text/html; charset=UTF-8",
            "Message-ID: <" . uniqid() . "@" . explode('@', $email)[1] . ">",
            "Date: " . date('r')
        ];
        echo json_encode(['headers' => $headers, 'raw' => implode("\r\n", $headers)]);
        break;
    default:
        echo json_encode(['actions' => ['encode','build']]);
}