<?php ob_start();
require_once('include/headscript.php');
/**
 * YogiBook - Gestione insegnanti (CRUD)
 * Tabella: employee
 * - un solo titolare (is_owner = 'Y'), non eliminabile né disattivabile
 * - notifiche email attivabili/disattivabili
 * - foto opzionale (JPG/PNG/WEBP, max 3 MB) in assets/images/teachers/
 */
$pdo = DBHandlerSelect::getInstance()->getConnection();

if (!function_exists('e')) {
    function e($value): string
    {
        return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
    }
}

if (session_status() !== PHP_SESSION_ACTIVE) {
    session_start();
}
if (empty($_SESSION['csrf_teachers'])) {
    $_SESSION['csrf_teachers'] = bin2hex(random_bytes(16));
}
$csrf = $_SESSION['csrf_teachers'];

define('PHOTO_DIR_REL', 'assets/images/teachers/');
$photoDirAbs = __DIR__ . '/' . PHOTO_DIR_REL;

/* ================================================================ helper */

function flashRedirect(string $type, string $msg): void
{
    $_SESSION['teachers_flash'] = [$type, $msg];
    header('Location: insegnanti.php');
    exit;
}

function teacherInitials(string $first, string $last): string
{
    $ini = mb_strtoupper(mb_substr(trim($first), 0, 1) . mb_substr(trim($last), 0, 1));
    return $ini !== '' ? $ini : '?';
}

function teacherColor(string $seed): string
{
    $palette = ['#1ebf73', '#2980b9', '#8e44ad', '#e67e22', '#16a085', '#c0392b', '#2c3e50', '#b08d57'];
    return $palette[abs(crc32($seed)) % count($palette)];
}

function deletePhotoFile(string $dir, ?string $name): void
{
    if ($name && preg_match('/^teacher_[a-f0-9]{16}\.(jpg|png|webp)$/', $name) && is_file($dir . $name)) {
        @unlink($dir . $name);
    }
}

/** Ritorna il nome file salvato, null se nessun file caricato. Lancia RuntimeException se non valido. */
function handlePhotoUpload(array $file, string $dir): ?string
{
    if (($file['error'] ?? UPLOAD_ERR_NO_FILE) === UPLOAD_ERR_NO_FILE) {
        return null;
    }
    if ($file['error'] !== UPLOAD_ERR_OK) {
        throw new RuntimeException('Errore nel caricamento della foto.');
    }
    if ($file['size'] > 3 * 1024 * 1024) {
        throw new RuntimeException('La foto supera i 3 MB.');
    }
    $mime = (new finfo(FILEINFO_MIME_TYPE))->file($file['tmp_name']);
    $ext = ['image/jpeg' => 'jpg', 'image/png' => 'png', 'image/webp' => 'webp'][$mime] ?? null;
    if (!$ext || @getimagesize($file['tmp_name']) === false) {
        throw new RuntimeException('Formato foto non valido: usa JPG, PNG o WEBP.');
    }
    if (!is_dir($dir) && !@mkdir($dir, 0755, true)) {
        throw new RuntimeException('La cartella delle foto non è scrivibile.');
    }
    $name = 'teacher_' . bin2hex(random_bytes(8)) . '.' . $ext;
    if (!move_uploaded_file($file['tmp_name'], $dir . $name)) {
        throw new RuntimeException('Impossibile salvare la foto.');
    }
    return $name;
}

function findTeacher(PDO $pdo, int $id): ?array
{
    $st = $pdo->prepare("SELECT * FROM employee WHERE idemployee = :id");
    $st->execute([':id' => $id]);
    $row = $st->fetch();
    return $row ?: null;
}

/* ================================================================ azioni POST */

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (!hash_equals($csrf, (string) ($_POST['csrf'] ?? ''))) {
        flashRedirect('danger', 'Sessione scaduta, riprova.');
    }

    $action = $_POST['action'] ?? '';
    $id = (int) ($_POST['id'] ?? 0);

    try {
        /* ---------- crea / modifica */
        if ($action === 'save') {
            $name    = trim((string) ($_POST['nameemployee'] ?? ''));
            $surname = trim((string) ($_POST['surnameemployee'] ?? ''));
            $email   = trim((string) ($_POST['email'] ?? ''));
            $phone   = trim((string) ($_POST['phone'] ?? ''));
            $notify  = isset($_POST['notifications']) ? 'Y' : 'N';
            $active  = isset($_POST['active']) ? 'Y' : 'N';

            if ($name === '' || $surname === '') {
                flashRedirect('danger', 'Nome e cognome sono obbligatori.');
            }
            if (mb_strlen($name) > 100 || mb_strlen($surname) > 100) {
                flashRedirect('danger', 'Nome o cognome troppo lunghi.');
            }
            if ($email !== '' && !filter_var($email, FILTER_VALIDATE_EMAIL)) {
                flashRedirect('danger', 'Indirizzo email non valido.');
            }
            if ($phone !== '' && !preg_match('/^[0-9 +().\/-]{5,40}$/', $phone)) {
                flashRedirect('danger', 'Numero di telefono non valido.');
            }
            if ($email !== '') {
                $dup = $pdo->prepare("SELECT COUNT(*) AS c FROM employee WHERE email = :email AND idemployee <> :id");
                $dup->execute([':email' => $email, ':id' => $id]);
                if ((int) $dup->fetch()['c'] > 0) {
                    flashRedirect('danger', 'Questa email è già usata da un altro insegnante.');
                }
            }

            if ($id > 0) {
                $current = findTeacher($pdo, $id);
                if (!$current) {
                    flashRedirect('danger', 'Insegnante non trovato.');
                }
                if ($current['is_owner'] === 'Y' && $active === 'N') {
                    flashRedirect('danger', 'Il titolare non può essere disattivato.');
                }

                $photo = $current['photo'];
                $newPhoto = handlePhotoUpload($_FILES['photo'] ?? [], $photoDirAbs);
                if ($newPhoto !== null) {
                    deletePhotoFile($photoDirAbs, $photo);
                    $photo = $newPhoto;
                } elseif (isset($_POST['remove_photo'])) {
                    deletePhotoFile($photoDirAbs, $photo);
                    $photo = null;
                }

                $st = $pdo->prepare("UPDATE employee SET nameemployee = :n, surnameemployee = :s, email = :e,
                        phone = :p, photo = :ph, notifications = :nt, active = :a
                    WHERE idemployee = :id");
                $st->execute([
                    ':n' => $name,
                    ':s' => $surname,
                    ':e' => $email ?: null,
                    ':p' => $phone ?: null,
                    ':ph' => $photo,
                    ':nt' => $notify,
                    ':a' => $active,
                    ':id' => $id,
                ]);
                flashRedirect('success', 'Insegnante aggiornato.');
            }

            // nuovo
            $photo = handlePhotoUpload($_FILES['photo'] ?? [], $photoDirAbs);
            $hasOwner = (int) $pdo->query("SELECT COUNT(*) AS c FROM employee WHERE is_owner = 'Y'")->fetch()['c'] > 0;

            $st = $pdo->prepare("INSERT INTO employee
                    (nameemployee, surnameemployee, email, phone, photo, is_owner, notifications, active, idlocation)
                VALUES (:n, :s, :e, :p, :ph, :o, :nt, :a, 0)");
            $st->execute([
                ':n' => $name,
                ':s' => $surname,
                ':e' => $email ?: null,
                ':p' => $phone ?: null,
                ':ph' => $photo,
                ':o' => $hasOwner ? 'N' : 'Y',
                ':nt' => $notify,
                ':a' => $hasOwner ? $active : 'Y',
            ]);
            flashRedirect('success', 'Insegnante aggiunto' . ($hasOwner ? '.' : ' e impostato come titolare.'));
        }

        /* ---------- imposta titolare */
        if ($action === 'set_owner' && $id > 0) {
            if (!findTeacher($pdo, $id)) {
                flashRedirect('danger', 'Insegnante non trovato.');
            }
            $pdo->beginTransaction();
            $pdo->exec("UPDATE employee SET is_owner = 'N' WHERE is_owner = 'Y'");
            $st = $pdo->prepare("UPDATE employee SET is_owner = 'Y', active = 'Y' WHERE idemployee = :id");
            $st->execute([':id' => $id]);
            $pdo->commit();
            flashRedirect('success', 'Titolare aggiornato.');
        }

        /* ---------- notifiche on/off */
        if ($action === 'toggle_notifications' && $id > 0) {
            $st = $pdo->prepare("UPDATE employee SET notifications = IF(notifications = 'Y', 'N', 'Y') WHERE idemployee = :id");
            $st->execute([':id' => $id]);
            flashRedirect('success', 'Notifiche aggiornate.');
        }

        /* ---------- elimina */
        if ($action === 'delete' && $id > 0) {
            $t = findTeacher($pdo, $id);
            if (!$t) {
                flashRedirect('danger', 'Insegnante non trovato.');
            }
            if ($t['is_owner'] === 'Y') {
                flashRedirect('danger', 'Il titolare non può essere eliminato. Imposta prima un altro titolare.');
            }
            $cnt = $pdo->prepare("SELECT COUNT(*) AS c FROM service WHERE idteacher = :id");
            $cnt->execute([':id' => $id]);
            $nServices = (int) $cnt->fetch()['c'];
            if ($nServices > 0) {
                flashRedirect('danger', 'Impossibile eliminare: ha ' . $nServices . ' classi assegnate. Riassegnale oppure disattiva l\'insegnante.');
            }
            $pdo->beginTransaction();
            $pdo->prepare("DELETE FROM dayoff WHERE idteacher = :id")->execute([':id' => $id]);
            $pdo->prepare("DELETE FROM employee WHERE idemployee = :id")->execute([':id' => $id]);
            $pdo->commit();
            deletePhotoFile($photoDirAbs, $t['photo']);
            flashRedirect('success', 'Insegnante eliminato.');
        }

        flashRedirect('danger', 'Azione non valida.');
    } catch (RuntimeException $ex) {
        flashRedirect('danger', $ex->getMessage());
    } catch (Throwable $ex) {
        if ($pdo->inTransaction()) {
            $pdo->rollBack();
        }
        error_log('insegnanti.php: ' . $ex->getMessage());
        flashRedirect('danger', 'Errore durante il salvataggio. Riprova.');
    }
}

/* ================================================================ lettura */

$flash = $_SESSION['teachers_flash'] ?? null;
unset($_SESSION['teachers_flash']);

$teachers = $pdo->query("SELECT e.*,
        (SELECT COUNT(*) FROM service s WHERE s.idteacher = e.idemployee) AS nservices
    FROM employee e
    ORDER BY e.is_owner DESC, e.active DESC, e.surnameemployee, e.nameemployee")->fetchAll();
?>
<!doctype html>
<html lang="it">

<head>
    <meta charset="utf-8" />
    <title>YogiBook - Insegnanti</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta content="YogiBook - Prenotazione facile YogaSoul" name="description" />
    <meta content="Advanced Creative Solutions" name="author" />
    <link rel="shortcut icon" href="assets/images/favicon.ico">
    <link href="assets/css/bootstrap.min.css" id="bootstrap-style" rel="stylesheet" type="text/css" />
    <link href="assets/css/icons.min.css" rel="stylesheet" type="text/css" />
    <link href="assets/css/app.min.css" id="app-style" rel="stylesheet" type="text/css" />
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">
    <script src="https://cdn.jsdelivr.net/npm/sweetalert2@11"></script>

    <style>
        .teachers-head {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 20px;
        }

        .teachers-head h5 {
            margin: 0;
            font-weight: 700;
            color: #374151;
        }

        .teacher-card {
            background: #fff;
            border-radius: 14px;
            box-shadow: 0 3px 16px rgba(0, 0, 0, 0.06);
            padding: 20px;
            margin-bottom: 20px;
            height: calc(100% - 20px);
            display: flex;
            flex-direction: column;
            border-top: 5px solid #eef0f3;
            transition: box-shadow 0.2s;
        }

        .teacher-card:hover {
            box-shadow: 0 6px 22px rgba(0, 0, 0, 0.1);
        }

        .teacher-card.owner {
            border-top-color: #E1D0B8;
        }

        .teacher-card.inactive {
            opacity: 0.6;
        }

        .teacher-top {
            display: flex;
            gap: 14px;
            align-items: center;
            margin-bottom: 14px;
        }

        .teacher-avatar {
            flex: 0 0 64px;
            width: 64px;
            height: 64px;
            border-radius: 50%;
            object-fit: cover;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 22px;
            font-weight: 800;
            border: 3px solid #f3f4f6;
        }

        .teacher-name {
            font-size: 17px;
            font-weight: 700;
            color: #1f2937;
            line-height: 1.2;
        }

        .t-badge {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            padding: 3px 10px;
            border-radius: 20px;
            margin-top: 5px;
            margin-right: 4px;
        }

        .t-badge.owner {
            background: #E1D0B8;
            color: #5a4630;
        }

        .t-badge.inactive {
            background: #eef0f3;
            color: #6b7280;
        }

        .teacher-info {
            font-size: 14px;
            color: #4b5563;
            margin-bottom: 4px;
            word-break: break-all;
        }

        .teacher-info i {
            width: 18px;
            color: #9ca3af;
        }

        .teacher-info a {
            color: #4b5563;
        }

        .teacher-info .missing {
            color: #c0c4cc;
            font-style: italic;
        }

        .teacher-foot {
            margin-top: auto;
            padding-top: 14px;
            border-top: 1px solid #f0f2f5;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            align-items: center;
            justify-content: space-between;
        }

        .notify-form .form-check-label {
            font-size: 13px;
            font-weight: 600;
            color: #4b5563;
            cursor: pointer;
        }

        .notify-form .form-check-input {
            cursor: pointer;
        }

        .notify-form .form-check-input:checked {
            background-color: #1ebf73;
            border-color: #1ebf73;
        }

        .notify-warning {
            font-size: 11px;
            color: #e67e22;
            font-weight: 600;
        }

        .t-actions {
            display: flex;
            gap: 6px;
        }

        .t-btn {
            border: none;
            border-radius: 8px;
            padding: 6px 11px;
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            transition: filter 0.15s;
        }

        .t-btn:hover {
            filter: brightness(0.93);
        }

        .t-btn.edit {
            background: #eef2f7;
            color: #374151;
        }

        .t-btn.owner {
            background: #f5eee4;
            color: #8a6a3f;
        }

        .t-btn.del {
            background: #fdecea;
            color: #c0392b;
        }

        .photo-preview {
            width: 84px;
            height: 84px;
            border-radius: 50%;
            object-fit: cover;
            background: #f3f4f6;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #9ca3af;
            font-size: 28px;
            border: 3px solid #eef0f3;
            overflow: hidden;
        }

        .photo-preview img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .empty-teachers {
            text-align: center;
            color: #9ca3af;
            padding: 50px 10px;
        }
    </style>
</head>

<body>
    <div id="layout-wrapper">
        <header id="page-topbar" class="isvertical-topbar">
            <div class="navbar-header">
                <div class="d-flex">
                    <?php include('include/logoarea.php'); ?>
                    <button type="button" class="btn btn-sm px-3 font-size-24 header-item waves-effect vertical-menu-btn">
                        <i class="bx bx-menu align-middle"></i>
                    </button>
                    <div class="page-title-box align-self-center d-none d-md-block">
                        <h4 class="page-title mb-0">Insegnanti</h4>
                    </div>
                </div>
                <div class="d-flex">
                    <?php include('include/languageselection.php'); ?>
                    <?php include('include/profiletopbar.php'); ?>
                </div>
            </div>
        </header>
        <?php include('include/sidebar.php'); ?>
        <header class="ishorizontal-topbar">
            <div class="navbar-header">
                <div class="d-flex"></div>
            </div>
            <div class="topnav">
                <div class="container-fluid">
                    <nav class="navbar navbar-light navbar-expand-lg topnav-menu"></nav>
                </div>
            </div>
        </header>

        <div class="main-content">
            <div class="page-content">
                <div class="container-fluid">

                    <?php if ($flash) : ?>
                        <div class="alert alert-<?php echo e($flash[0]); ?> alert-dismissible fade show" role="alert">
                            <?php echo e($flash[1]); ?>
                            <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Chiudi"></button>
                        </div>
                    <?php endif; ?>

                    <div class="teachers-head">
                        <div>
                            <h5>Insegnanti della scuola</h5>
                            <small class="text-muted"><?php echo count($teachers); ?> insegnant<?php echo count($teachers) === 1 ? 'e' : 'i'; ?></small>
                        </div>
                        <button type="button" class="btn btn-primary" onclick="openTeacherModal(null)">
                            <i class="fas fa-user-plus me-1"></i> Nuovo insegnante
                        </button>
                    </div>

                    <?php if (empty($teachers)) : ?>
                        <div class="empty-teachers">
                            <i class="fas fa-chalkboard-teacher fa-2x mb-2"></i>
                            <p>Nessun insegnante. Aggiungi il primo: diventerà automaticamente il titolare.</p>
                        </div>
                    <?php else : ?>
                        <div class="row">
                            <?php foreach ($teachers as $t) :
                                $tid = (int) $t['idemployee'];
                                $isOwner = $t['is_owner'] === 'Y';
                                $isActive = $t['active'] === 'Y';
                                $fullName = trim($t['nameemployee'] . ' ' . $t['surnameemployee']);
                                $photoUrl = $t['photo'] ? PHOTO_DIR_REL . $t['photo'] : '';
                                $payload = [
                                    'id' => $tid,
                                    'nameemployee' => $t['nameemployee'],
                                    'surnameemployee' => $t['surnameemployee'],
                                    'email' => $t['email'],
                                    'phone' => $t['phone'],
                                    'photo' => $photoUrl,
                                    'notifications' => $t['notifications'] === 'Y',
                                    'active' => $isActive,
                                    'is_owner' => $isOwner,
                                ];
                            ?>
                                <div class="col-md-6 col-xl-4">
                                    <div class="teacher-card <?php echo $isOwner ? 'owner' : ''; ?> <?php echo $isActive ? '' : 'inactive'; ?>">
                                        <div class="teacher-top">
                                            <?php if ($photoUrl) : ?>
                                                <img class="teacher-avatar" src="<?php echo e($photoUrl); ?>" alt="<?php echo e($fullName); ?>">
                                            <?php else : ?>
                                                <div class="teacher-avatar" style="background:<?php echo teacherColor($fullName); ?>;"><?php echo e(teacherInitials($t['nameemployee'], $t['surnameemployee'])); ?></div>
                                            <?php endif; ?>
                                            <div>
                                                <div class="teacher-name"><?php echo e($fullName); ?></div>
                                                <?php if ($isOwner) : ?><span class="t-badge owner"><i class="fas fa-crown me-1"></i>Titolare</span><?php endif; ?>
                                                <?php if (!$isActive) : ?><span class="t-badge inactive">Non attivo</span><?php endif; ?>
                                            </div>
                                        </div>

                                        <div class="teacher-info"><i class="far fa-envelope"></i>
                                            <?php echo $t['email'] ? '<a href="mailto:' . e($t['email']) . '">' . e($t['email']) . '</a>' : '<span class="missing">email non inserita</span>'; ?>
                                        </div>
                                        <div class="teacher-info"><i class="fas fa-phone"></i>
                                            <?php echo $t['phone'] ? '<a href="tel:' . e(preg_replace('/[^0-9+]/', '', $t['phone'])) . '">' . e($t['phone']) . '</a>' : '<span class="missing">telefono non inserito</span>'; ?>
                                        </div>
                                        <div class="teacher-info"><i class="fas fa-layer-group"></i>
                                            <?php echo (int) $t['nservices']; ?> class<?php echo (int) $t['nservices'] === 1 ? 'e' : 'i'; ?> assegnat<?php echo (int) $t['nservices'] === 1 ? 'a' : 'e'; ?>
                                        </div>

                                        <div class="teacher-foot">
                                            <form method="post" class="notify-form">
                                                <input type="hidden" name="csrf" value="<?php echo e($csrf); ?>">
                                                <input type="hidden" name="action" value="toggle_notifications">
                                                <input type="hidden" name="id" value="<?php echo $tid; ?>">
                                                <div class="form-check form-switch mb-0">
                                                    <input class="form-check-input" type="checkbox" role="switch" id="notify<?php echo $tid; ?>"
                                                        <?php echo $t['notifications'] === 'Y' ? 'checked' : ''; ?> onchange="this.form.submit()">
                                                    <label class="form-check-label" for="notify<?php echo $tid; ?>">Notifiche email</label>
                                                </div>
                                                <?php if ($t['notifications'] === 'Y' && !$t['email']) : ?>
                                                    <div class="notify-warning"><i class="fas fa-exclamation-triangle"></i> manca l'email</div>
                                                <?php endif; ?>
                                            </form>

                                            <div class="t-actions">
                                                <button type="button" class="t-btn edit" title="Modifica"
                                                    data-teacher="<?php echo e(json_encode($payload)); ?>"
                                                    onclick="openTeacherModal(JSON.parse(this.dataset.teacher))">
                                                    <i class="fas fa-pen"></i>
                                                </button>
                                                <?php if (!$isOwner) : ?>
                                                    <form method="post" class="confirm-form"
                                                        data-title="Impostare come titolare?"
                                                        data-text="<?php echo e($fullName); ?> diventerà il titolare della scuola al posto dell'attuale.">
                                                        <input type="hidden" name="csrf" value="<?php echo e($csrf); ?>">
                                                        <input type="hidden" name="action" value="set_owner">
                                                        <input type="hidden" name="id" value="<?php echo $tid; ?>">
                                                        <button type="submit" class="t-btn owner" title="Imposta come titolare"><i class="fas fa-crown"></i></button>
                                                    </form>
                                                    <form method="post" class="confirm-form" data-danger="1"
                                                        data-title="Eliminare <?php echo e($fullName); ?>?"
                                                        data-text="L'operazione non è reversibile.">
                                                        <input type="hidden" name="csrf" value="<?php echo e($csrf); ?>">
                                                        <input type="hidden" name="action" value="delete">
                                                        <input type="hidden" name="id" value="<?php echo $tid; ?>">
                                                        <button type="submit" class="t-btn del" title="Elimina"><i class="fas fa-trash"></i></button>
                                                    </form>
                                                <?php endif; ?>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            <?php endforeach; ?>
                        </div>
                    <?php endif; ?>

                </div>
                <?php include('include/footer.php'); ?>
            </div>
        </div>
    </div>

    <!-- ============================================ MODALE CREA / MODIFICA -->
    <div class="modal fade" id="teacherModal" tabindex="-1" aria-hidden="true">
        <div class="modal-dialog modal-dialog-centered">
            <form class="modal-content" method="post" enctype="multipart/form-data" id="teacherForm">
                <div class="modal-header">
                    <h5 class="modal-title" id="teacherModalTitle">Nuovo insegnante</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Chiudi"></button>
                </div>
                <div class="modal-body">
                    <input type="hidden" name="csrf" value="<?php echo e($csrf); ?>">
                    <input type="hidden" name="action" value="save">
                    <input type="hidden" name="id" id="t_id" value="0">

                    <div class="d-flex align-items-center gap-3 mb-3">
                        <div class="photo-preview" id="t_preview"><i class="fas fa-user"></i></div>
                        <div class="flex-grow-1">
                            <label class="form-label mb-1">Foto <small class="text-muted">(facoltativa, JPG/PNG/WEBP, max 3 MB)</small></label>
                            <input type="file" name="photo" id="t_photo" class="form-control form-control-sm" accept="image/jpeg,image/png,image/webp">
                            <div class="form-check mt-2" id="t_remove_wrap" style="display:none;">
                                <input class="form-check-input" type="checkbox" name="remove_photo" id="t_remove">
                                <label class="form-check-label" for="t_remove">Rimuovi foto attuale</label>
                            </div>
                        </div>
                    </div>

                    <div class="row g-2">
                        <div class="col-6">
                            <label class="form-label mb-1">Nome *</label>
                            <input type="text" name="nameemployee" id="t_name" class="form-control" maxlength="100" required>
                        </div>
                        <div class="col-6">
                            <label class="form-label mb-1">Cognome *</label>
                            <input type="text" name="surnameemployee" id="t_surname" class="form-control" maxlength="100" required>
                        </div>
                        <div class="col-12">
                            <label class="form-label mb-1">Email</label>
                            <input type="email" name="email" id="t_email" class="form-control" maxlength="150">
                        </div>
                        <div class="col-12">
                            <label class="form-label mb-1">Telefono</label>
                            <input type="text" name="phone" id="t_phone" class="form-control" maxlength="40">
                        </div>
                    </div>

                    <div class="mt-3">
                        <div class="form-check form-switch">
                            <input class="form-check-input" type="checkbox" name="notifications" id="t_notify" checked>
                            <label class="form-check-label" for="t_notify">Riceve notifiche email</label>
                        </div>
                        <div class="form-check form-switch">
                            <input class="form-check-input" type="checkbox" name="active" id="t_active" checked>
                            <label class="form-check-label" for="t_active">Attivo</label>
                        </div>
                        <div class="text-muted" id="t_owner_note" style="font-size:12px;display:none;">
                            <i class="fas fa-crown me-1" style="color:#b08d57;"></i> È il titolare: non può essere disattivato.
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal">Annulla</button>
                    <button type="submit" class="btn btn-primary"><i class="fas fa-save me-1"></i> Salva</button>
                </div>
            </form>
        </div>
    </div>

    <script src="assets/libs/bootstrap/js/bootstrap.bundle.min.js"></script>
    <script src="assets/libs/metismenujs/metismenujs.min.js"></script>
    <script src="assets/libs/simplebar/simplebar.min.js"></script>
    <script src="assets/libs/eva-icons/eva.min.js"></script>
    <script src="assets/js/app.js"></script>

    <script>
        var teacherModal = null;

        function setPreview(url) {
            var box = document.getElementById('t_preview');
            box.innerHTML = url ? '<img src="' + url + '" alt="">' : '<i class="fas fa-user"></i>';
        }

        function openTeacherModal(t) {
            var isEdit = !!t;
            document.getElementById('teacherModalTitle').textContent = isEdit ? 'Modifica insegnante' : 'Nuovo insegnante';
            document.getElementById('t_id').value = isEdit ? t.id : 0;
            document.getElementById('t_name').value = isEdit ? (t.nameemployee || '') : '';
            document.getElementById('t_surname').value = isEdit ? (t.surnameemployee || '') : '';
            document.getElementById('t_email').value = isEdit ? (t.email || '') : '';
            document.getElementById('t_phone').value = isEdit ? (t.phone || '') : '';
            document.getElementById('t_notify').checked = isEdit ? t.notifications : true;

            var active = document.getElementById('t_active');
            active.checked = isEdit ? t.active : true;
            active.disabled = isEdit && t.is_owner;
            document.getElementById('t_owner_note').style.display = (isEdit && t.is_owner) ? 'block' : 'none';

            document.getElementById('t_photo').value = '';
            document.getElementById('t_remove').checked = false;
            document.getElementById('t_remove_wrap').style.display = (isEdit && t.photo) ? 'block' : 'none';
            setPreview(isEdit ? t.photo : '');

            if (!teacherModal) teacherModal = new bootstrap.Modal(document.getElementById('teacherModal'));
            teacherModal.show();
        }

        // il titolare ha "Attivo" disabilitato: lo riabilitiamo al submit così il valore viene inviato
        document.getElementById('teacherForm').addEventListener('submit', function() {
            document.getElementById('t_active').disabled = false;
        });

        // anteprima foto + controllo dimensione
        document.getElementById('t_photo').addEventListener('change', function() {
            var f = this.files[0];
            if (!f) return;
            if (f.size > 3 * 1024 * 1024) {
                Swal.fire('Foto troppo grande', 'La foto deve essere al massimo di 3 MB.', 'warning');
                this.value = '';
                return;
            }
            var reader = new FileReader();
            reader.onload = function(ev) {
                setPreview(ev.target.result);
            };
            reader.readAsDataURL(f);
            document.getElementById('t_remove').checked = false;
        });

        // conferma per titolare / elimina
        document.querySelectorAll('.confirm-form').forEach(function(form) {
            form.addEventListener('submit', function(ev) {
                if (form.dataset.confirmed === '1') return;
                ev.preventDefault();
                var danger = form.dataset.danger === '1';
                Swal.fire({
                    title: form.dataset.title,
                    text: form.dataset.text,
                    icon: danger ? 'warning' : 'question',
                    showCancelButton: true,
                    confirmButtonColor: danger ? '#e74c3c' : '#b08d57',
                    cancelButtonColor: '#6b7280',
                    confirmButtonText: danger ? 'Sì, elimina' : 'Sì, conferma',
                    cancelButtonText: 'Annulla'
                }).then(function(r) {
                    if (r.isConfirmed) {
                        form.dataset.confirmed = '1';
                        form.submit();
                    }
                });
            });
        });
    </script>
</body>

</html>