<?php
// sessions_archive.php - Archive Sessions (month-based, lightweight)
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

include('include/headscript.php');
include(dirname(__DIR__) . '/userarea/class/mailer.php'); // Your PHPMailer

$dbHandler = DBHandlerSelect::getInstance();
$pdo = $dbHandler->getConnection();

if (!isset($iduserlogin)) {
    die("Errore: ID utente non definito.");
}

// (Optional) Set Italian locale for month names if needed
// setlocale(LC_TIME, 'it_IT.UTF-8', 'it_IT', 'Italian_Italy');

$stmt = $pdo->prepare("SELECT id, name, logo FROM schools WHERE owner_id = ?");
$stmt->execute([$iduserlogin]);
$school = $stmt->fetch(PDO::FETCH_ASSOC);

if (!$school) {
    die("Errore: Nessuna scuola trovata.");
}

$school_id   = (int)$school['id'];
$school_name = $school['name'];

// === School users for "Add participant" dropdown ===
$stmtUsers = $pdo->prepare("
    SELECT au.id, au.first_name, au.last_name, au.email
    FROM user_schools us
    JOIN auth_users au ON au.id = us.user_id
    WHERE us.school_id = ?
      AND us.status = 'active'
    ORDER BY au.first_name, au.last_name
");
$stmtUsers->execute([$school_id]);
$schoolUsers = $stmtUsers->fetchAll(PDO::FETCH_ASSOC);

// === Month filter (ym=YYYY-MM) ===
$ym = $_GET['ym'] ?? date('Y-m');
if (!preg_match('/^\d{4}\-\d{2}$/', $ym)) {
    $ym = date('Y-m');
}

$startDate = $ym . '-01';
$dtStart   = new DateTime($startDate);
$dtEnd     = (clone $dtStart)->modify('first day of next month');
$endDate   = $dtEnd->format('Y-m-d');

// Month navigation
$prevYm = (clone $dtStart)->modify('-1 month')->format('Y-m');
$nextYm = (clone $dtStart)->modify('+1 month')->format('Y-m');

// Build months dropdown (last 24 months + next 2 months)
$monthsList = [];
$base = new DateTime(date('Y-m-01'));
for ($i = 24; $i >= 1; $i--) {
    $m = (clone $base)->modify("-{$i} month")->format('Y-m');
    $monthsList[] = $m;
}
$monthsList[] = $base->format('Y-m');
$monthsList[] = (clone $base)->modify('+1 month')->format('Y-m');
$monthsList[] = (clone $base)->modify('+2 month')->format('Y-m');

// === Actions (same as future_sessions) ===
$feedback = '';
$showEmailModal = false;
$emailData = null;

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = $_POST['action'] ?? '';

    // Delete session (optionally with email)
    if ($action === 'delete_session') {
        $session_id = (int)($_POST['session_id'] ?? 0);
        $send_email = isset($_POST['send_email']) && $_POST['send_email'] === '1';

        $stmt = $pdo->prepare("
            SELECT cs.id, cs.session_date, cs.start_time, cs.end_time,
                   c.name AS class_name, ct.level
            FROM class_sessions cs
            JOIN class_types ct ON cs.class_type_id = ct.id
            JOIN classes c ON ct.class_id = c.id
            WHERE cs.id = ? AND c.school_id = ?
        ");
        $stmt->execute([$session_id, $school_id]);
        $session = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($session) {
            $recipients = [];
            if ($send_email) {
                $stmt2 = $pdo->prepare("
                    SELECT au.email, au.first_name
                    FROM session_bookings sb
                    JOIN auth_users au ON sb.user_id = au.id
                    WHERE sb.session_id = ?
                ");
                $stmt2->execute([$session_id]);
                $recipients = $stmt2->fetchAll(PDO::FETCH_ASSOC);
            }

            // If email requested and recipients exist -> open email modal, do not delete yet
            if ($send_email && !empty($recipients)) {
                $showEmailModal = true;
                $emailData = [
                    'session_id'  => $session_id,
                    'class_name'  => $session['class_name'],
                    'level'       => $session['level'] ?? '',
                    'date'        => date('d/m/Y', strtotime($session['session_date'])),
                    'time'        => substr($session['start_time'], 0, 5) . ' - ' . substr($session['end_time'], 0, 5),
                    'recipients'  => $recipients
                ];
            } else {
                // Delete immediately
                $stmtDel = $pdo->prepare("
                    DELETE cs FROM class_sessions cs
                    JOIN class_types ct ON cs.class_type_id = ct.id
                    JOIN classes c ON ct.class_id = c.id
                    WHERE cs.id = ? AND c.school_id = ?
                ");
                $stmtDel->execute([$session_id, $school_id]);

                $feedback = '<div class="alert alert-success alert-dismissible fade show">
                    Lezione cancellata con successo!
                    <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                </div>';
            }
        }
    }

    // Send cancellation email then delete
    elseif ($action === 'send_cancellation_email') {
        $session_id = (int)($_POST['session_id'] ?? 0);
        $body_text  = $_POST['email_body'] ?? '';

        $stmt = $pdo->prepare("
            SELECT c.name AS class_name, ct.level, cs.session_date, cs.start_time, cs.end_time
            FROM class_sessions cs
            JOIN class_types ct ON cs.class_type_id = ct.id
            JOIN classes c ON ct.class_id = c.id
            WHERE cs.id = ? AND c.school_id = ?
        ");
        $stmt->execute([$session_id, $school_id]);
        $session = $stmt->fetch(PDO::FETCH_ASSOC);

        $class_info = $session ? ($session['class_name'] . ($session['level'] ? ' (' . ucfirst($session['level']) . ')' : '')) : '';
        $date = $session ? date('d/m/Y', strtotime($session['session_date'])) : '';
        $time = $session ? substr($session['start_time'], 0, 5) . '-' . substr($session['end_time'], 0, 5) : '';

        $stmt = $pdo->prepare("
            SELECT au.email, au.first_name
            FROM session_bookings sb
            JOIN auth_users au ON sb.user_id = au.id
            WHERE sb.session_id = ?
        ");
        $stmt->execute([$session_id]);
        $recipients = $stmt->fetchAll(PDO::FETCH_ASSOC);

        $subject = "Lezione cancellata - {$school_name}";
        $sent = 0;

        foreach ($recipients as $r) {
            $personal_body = str_replace(
                ['{nome}', '{classe}', '{data}', '{ora}'],
                [$r['first_name'] ?: 'Gentile utente', $class_info, $date, $time],
                $body_text
            );
            $result = sendEmail($r['email'], $subject, $personal_body);
            if (!empty($result['success'])) $sent++;
        }

        $stmtDel = $pdo->prepare("
            DELETE cs FROM class_sessions cs
            JOIN class_types ct ON cs.class_type_id = ct.id
            JOIN classes c ON ct.class_id = c.id
            WHERE cs.id = ? AND c.school_id = ?
        ");
        $stmtDel->execute([$session_id, $school_id]);

        $feedback = "<div class='alert alert-success alert-dismissible fade show'>
            Email inviate a {$sent} partecipanti.
            <button type='button' class='btn-close' data-bs-dismiss='alert'></button>
        </div>";
    }

    // Skip email then delete
    elseif ($action === 'skip_cancellation_email') {
        $session_id = (int)($_POST['session_id'] ?? 0);

        $stmtDel = $pdo->prepare("
            DELETE cs FROM class_sessions cs
            JOIN class_types ct ON cs.class_type_id = ct.id
            JOIN classes c ON ct.class_id = c.id
            WHERE cs.id = ? AND c.school_id = ?
        ");
        $stmtDel->execute([$session_id, $school_id]);

        $feedback = "<div class='alert alert-success alert-dismissible fade show'>
            Lezione cancellata (email non inviata).
            <button type='button' class='btn-close' data-bs-dismiss='alert'></button>
        </div>";
    }

    // Add booking
    elseif ($action === 'add_booking') {
        $session_id = (int)($_POST['session_id'] ?? 0);
        $user_id    = (int)($_POST['user_id'] ?? 0);

        if ($session_id <= 0 || $user_id <= 0) {
            $feedback = '<div class="alert alert-danger alert-dismissible fade show">Dati non validi.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
        } else {
            $stmt = $pdo->prepare("
                SELECT cs.id, ct.max_capacity,
                       (SELECT COUNT(*) FROM session_bookings sb 
                        WHERE sb.session_id = cs.id AND sb.status IN ('booked','attended','rescheduled')
                       ) AS booked_count
                FROM class_sessions cs
                JOIN class_types ct ON cs.class_type_id = ct.id
                JOIN classes c ON ct.class_id = c.id
                WHERE cs.id = ? AND c.school_id = ?
                LIMIT 1
            ");
            $stmt->execute([$session_id, $school_id]);
            $info = $stmt->fetch(PDO::FETCH_ASSOC);

            if (!$info) {
                $feedback = '<div class="alert alert-danger alert-dismissible fade show">Lezione non trovata o non autorizzata.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
            } else {
                $stmt = $pdo->prepare("
                    SELECT 1
                    FROM user_schools
                    WHERE user_id = ? AND school_id = ? AND status = 'active'
                    LIMIT 1
                ");
                $stmt->execute([$user_id, $school_id]);
                $isMember = (bool)$stmt->fetchColumn();

                if (!$isMember) {
                    $feedback = '<div class="alert alert-danger alert-dismissible fade show">Utente non associato a questa scuola.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
                } else {
                    $stmt = $pdo->prepare("SELECT 1 FROM session_bookings WHERE session_id = ? AND user_id = ? LIMIT 1");
                    $stmt->execute([$session_id, $user_id]);
                    $already = (bool)$stmt->fetchColumn();

                    if ($already) {
                        $feedback = '<div class="alert alert-warning alert-dismissible fade show">Questo utente è già presente nella lezione.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
                    } else {
                        $max = (int)($info['max_capacity'] ?? 0);
                        $cnt = (int)($info['booked_count'] ?? 0);

                        if ($max > 0 && $cnt >= $max) {
                            $feedback = '<div class="alert alert-danger alert-dismissible fade show">Lezione piena: capienza massima raggiunta.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
                        } else {
                            $stmtIns = $pdo->prepare("
                                INSERT INTO session_bookings (session_id, user_id, status, created_at, updated_at)
                                VALUES (?, ?, 'booked', NOW(), NOW())
                            ");
                            $stmtIns->execute([$session_id, $user_id]);

                            $feedback = '<div class="alert alert-success alert-dismissible fade show">Partecipante aggiunto alla lezione!<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
                        }
                    }
                }
            }
        }
    }

    // Mark lost
    elseif ($action === 'mark_lost') {
        $booking_id = (int)($_POST['booking_id'] ?? 0);
        $stmt = $pdo->prepare("
            UPDATE session_bookings sb
            JOIN class_sessions cs ON sb.session_id = cs.id
            JOIN class_types ct ON cs.class_type_id = ct.id
            JOIN classes c ON ct.class_id = c.id
            SET sb.status = 'missed'
            WHERE sb.id = ? AND c.school_id = ?
        ");
        $stmt->execute([$booking_id, $school_id]);
        $feedback = '<div class="alert alert-warning alert-dismissible fade show">Presenza segnata come persa.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
    }

    // Cancel booking
    elseif ($action === 'cancel_booking') {
        $booking_id = (int)($_POST['booking_id'] ?? 0);
        $stmt = $pdo->prepare("
            DELETE sb FROM session_bookings sb
            JOIN class_sessions cs ON sb.session_id = cs.id
            JOIN class_types ct ON cs.class_type_id = ct.id
            JOIN classes c ON ct.class_id = c.id
            WHERE sb.id = ? AND c.school_id = ?
        ");
        $stmt->execute([$booking_id, $school_id]);
        $feedback = '<div class="alert alert-danger alert-dismissible fade show">Prenotazione rimossa.<button type="button" class="btn-close" data-bs-dismiss="alert"></button></div>';
    }

    // Keep current month in redirect-less flow: we simply render again with the same ym from GET.
}

// === Sessions of selected month ===
$stmt = $pdo->prepare("
    SELECT 
        cs.id AS session_id,
        cs.session_date,
        cs.start_time,
        cs.end_time,
        c.name AS class_name,
        ct.level,
        ct.room_name,
        ct.max_capacity,
        t.first_name,
        t.last_name,
        (SELECT COUNT(*)
            FROM session_bookings sb
            WHERE sb.session_id = cs.id
              AND sb.status IN ('booked','attended','rescheduled')
        ) AS booked_count,
        (SELECT GROUP_CONCAT(
            CONCAT(sb.id,'|||',au.id,'|||',au.first_name,' ',au.last_name,'|||',au.email,'|||',COALESCE(au.phone,''),'|||',sb.status)
            SEPARATOR ';;;'
        )
        FROM session_bookings sb
        JOIN auth_users au ON sb.user_id = au.id
        WHERE sb.session_id = cs.id
          AND sb.status IN ('booked','attended','rescheduled','missed')
        ) AS booked_students_details
    FROM class_sessions cs
    JOIN class_types ct ON cs.class_type_id = ct.id
    JOIN classes c ON ct.class_id = c.id
    LEFT JOIN teachers t ON cs.teacher_id = t.id
    WHERE c.school_id = ?
      AND cs.session_date >= ?
      AND cs.session_date < ?
    ORDER BY cs.session_date, cs.start_time
");
$stmt->execute([$school_id, $startDate, $endDate]);
$sessions = $stmt->fetchAll(PDO::FETCH_ASSOC);


function humanMonthLabel($ym)
{
    $dt = DateTime::createFromFormat('Y-m', $ym);
    if (!$dt) return $ym;
    return ucfirst($dt->format('F Y')); // if locale not set, this will be English
}
?>
<!doctype html>
<html lang="it">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Archivio Lezioni - <?php echo htmlspecialchars($school_name); ?></title>
    <?php include('cssinclude.php'); ?>
    <?php include('siteinfo.php'); ?>
    <link rel="stylesheet" href="assets/plugins/select2/css/select2.min.css">
</head>

<body>
    <div class="wrapper">
        <?php include('include/navbar.php'); ?>
        <?php include('include/topbar.php'); ?>

        <div class="page-wrapper">
            <div class="page-content">

                <div class="card radius-10 mb-4">
                    <div class="card-body">
                        <div class="d-flex align-items-center">
                            <div class="me-4">
                                <img src="<?php echo $school['logo'] ? htmlspecialchars($school['logo']) : 'assets/images/default-school-logo.png'; ?>"
                                    alt="Logo" class="rounded-circle" style="width: 90px; height: 90px; object-fit: cover;">
                            </div>
                            <div class="flex-grow-1">
                                <h4 class="mb-1">Archivio Lezioni - <?php echo htmlspecialchars($school_name); ?></h4>
                                <p class="mb-0 text-muted">Vedi le lezioni mese per mese con le stesse funzioni (prenotati, P/C, cancellazione con email).</p>
                            </div>
                            <div class="d-flex gap-2">
                                <a href="future_sessions.php" class="btn btn-outline-primary">← Future</a>
                            </div>
                        </div>
                    </div>
                </div>

                <?php echo $feedback; ?>

                <div class="card radius-10 mb-4">
                    <div class="card-body">
                        <div class="d-flex flex-wrap align-items-end justify-content-between gap-3">
                            <div>
                                <div class="fw-bold mb-1">Mese selezionato</div>
                                <div class="d-flex gap-2">
                                    <a class="btn btn-outline-secondary btn-sm" href="?ym=<?php echo htmlspecialchars($prevYm); ?>">
                                        ← <?php echo htmlspecialchars($prevYm); ?>
                                    </a>
                                    <a class="btn btn-outline-secondary btn-sm" href="?ym=<?php echo htmlspecialchars($nextYm); ?>">
                                        <?php echo htmlspecialchars($nextYm); ?> →
                                    </a>
                                </div>
                            </div>

                            <form method="GET" class="d-flex gap-2 align-items-end">
                                <div>
                                    <label class="form-label mb-1">Seleziona mese</label>
                                    <select name="ym" class="form-select" style="min-width:220px;">
                                        <?php foreach ($monthsList as $m): ?>
                                            <option value="<?php echo htmlspecialchars($m); ?>" <?php echo $m === $ym ? 'selected' : ''; ?>>
                                                <?php echo htmlspecialchars($m); ?>
                                            </option>
                                        <?php endforeach; ?>
                                    </select>
                                </div>
                                <button class="btn btn-primary">Apri</button>
                            </form>
                        </div>
                    </div>
                </div>

                <?php if (empty($sessions)): ?>
                    <div class="card radius-10">
                        <div class="card-body text-center py-5">
                            <h5 class="text-muted">
                                Nessuna lezione trovata per il mese selezionato (<?php echo htmlspecialchars($ym); ?>).
                            </h5>
                        </div>
                    </div>
                <?php else: ?>
                    <div class="card radius-10 mb-4">
                        <div class="card-header bg-primary text-white d-flex align-items-center justify-content-between">
                            <h5 class="mb-0">Archivio mese: <?php echo htmlspecialchars(humanMonthLabel($ym)); ?></h5>
                            <span class="badge bg-light text-dark"><?php echo count($sessions); ?> lezioni</span>
                        </div>

                        <div class="card-body p-0">
                            <div class="table-responsive">
                                <table class="table table-hover mb-0">
                                    <thead class="table-light">
                                        <tr>
                                            <th>Data</th>
                                            <th>Orario</th>
                                            <th>Classe</th>
                                            <th>Livello</th>
                                            <th>Sala</th>
                                            <th>Insegnante</th>
                                            <th>Prenotati</th>
                                            <th>Azioni</th>
                                        </tr>
                                    </thead>

                                    <tbody>
                                        <?php foreach ($sessions as $s): ?>
                                            <tr id="<?php echo (int)$s['session_id']; ?>">
                                                <td><?php echo date('d/m/Y (l)', strtotime($s['session_date'])); ?></td>
                                                <td><?php echo substr($s['start_time'], 0, 5) . ' - ' . substr($s['end_time'], 0, 5); ?></td>
                                                <td><?php echo htmlspecialchars($s['class_name']); ?></td>
                                                <td><?php echo ucfirst($s['level'] ?? '-'); ?></td>
                                                <td><?php echo htmlspecialchars($s['room_name'] ?? '—'); ?></td>
                                                <td><?php echo $s['first_name'] ? htmlspecialchars($s['first_name'] . ' ' . $s['last_name']) : '<em>Non assegnato</em>'; ?></td>

                                                <td>
                                                    <button type="button"
                                                        class="btn btn-sm <?php echo ((int)$s['booked_count'] > 0) ? 'btn-success' : 'btn-outline-secondary'; ?>"
                                                        data-bs-toggle="modal"
                                                        data-bs-target="#studentsModal-<?php echo (int)$s['session_id']; ?>">
                                                        <?php
                                                        $bc  = (int)$s['booked_count'];
                                                        $max = (int)($s['max_capacity'] ?? 0);
                                                        echo ($max > 0) ? "{$bc}/{$max}" : "{$bc}/∞";
                                                        ?>
                                                    </button>
                                                </td>

                                                <td>
                                                    <button type="button" class="btn btn-sm btn-danger"
                                                        data-bs-toggle="modal"
                                                        data-bs-target="#deleteModal-<?php echo (int)$s['session_id']; ?>">
                                                        <i class="bx bx-trash"></i> Cancella
                                                    </button>
                                                </td>
                                            </tr>
                                        <?php endforeach; ?>
                                    </tbody>

                                </table>
                            </div>
                        </div>
                    </div>
                <?php endif; ?>

            </div>
        </div>

        <!-- MODALS (month-limited, OK) -->
        <?php foreach ($sessions as $session): ?>
            <?php
            $students_list = [];
            if (!empty($session['booked_students_details'])) {
                foreach (explode(';;;', $session['booked_students_details']) as $entry) {
                    if (empty(trim($entry))) continue;
                    $parts = explode('|||', $entry);
                    $students_list[] = [
                        'booking_id' => (int)($parts[0] ?? 0),
                        'user_id'    => (int)($parts[1] ?? 0),
                        'name'       => $parts[2] ?? '',
                        'email'      => $parts[3] ?? '',
                        'phone'      => $parts[4] ?? '—',
                        'status'     => $parts[5] ?? 'booked'
                    ];
                }
            }
            ?>

            <!-- Students modal -->
            <div class="modal fade" id="studentsModal-<?php echo (int)$session['session_id']; ?>" tabindex="-1">
                <div class="modal-dialog modal-lg">
                    <div class="modal-content">
                        <div class="modal-header bg-primary text-white">
                            <h5 class="modal-title">
                                Prenotati - <?php echo htmlspecialchars($session['class_name']); ?>
                                del <?php echo date('d/m/Y', strtotime($session['session_date'])); ?>
                            </h5>
                            <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
                        </div>
                        <div class="modal-body">
                            <?php
                            $bookedUserIds = [];
                            foreach ($students_list as $st) {
                                if (!empty($st['user_id'])) $bookedUserIds[] = (int)$st['user_id'];
                            }
                            $availableUsers = array_values(array_filter($schoolUsers, function ($u) use ($bookedUserIds) {
                                return !in_array((int)$u['id'], $bookedUserIds, true);
                            }));

                            $maxCap = (int)($session['max_capacity'] ?? 0);
                            $bookedCnt = (int)($session['booked_count'] ?? 0);
                            $isFull = ($maxCap > 0 && $bookedCnt >= $maxCap);
                            ?>

                            <div class="mb-3 p-3 border rounded bg-light">
                                <div class="d-flex align-items-center justify-content-between mb-2">
                                    <strong>Aggiungi partecipante</strong>
                                    <small class="text-muted">
                                        Capienza: <?php echo $maxCap > 0 ? ($bookedCnt . '/' . $maxCap) : ($bookedCnt . '/∞'); ?>
                                    </small>
                                </div>

                                <?php if ($isFull): ?>
                                    <div class="text-danger small">Lezione piena: non puoi aggiungere altri partecipanti.</div>
                                <?php elseif (empty($availableUsers)): ?>
                                    <div class="text-muted small">Nessun utente disponibile (tutti già presenti o nessun utente associato alla scuola).</div>
                                <?php else: ?>
                                    <form method="POST" class="row g-2 align-items-end">
                                        <input type="hidden" name="action" value="add_booking">
                                        <input type="hidden" name="session_id" value="<?php echo (int)$session['session_id']; ?>">

                                        <div class="col-12 col-md-8">
                                            <label class="form-label mb-1">Seleziona utente</label>
                                            <select name="user_id" class="form-select select2-user" required data-placeholder="Cerca per nome o email">
                                                <option value=""></option>
                                                <?php foreach ($availableUsers as $u): ?>
                                                    <option value="<?php echo (int)$u['id']; ?>">
                                                        <?php
                                                        $full = trim(($u['first_name'] ?? '') . ' ' . ($u['last_name'] ?? ''));
                                                        echo htmlspecialchars($full . ' — ' . ($u['email'] ?? ''));
                                                        ?>
                                                    </option>
                                                <?php endforeach; ?>
                                            </select>
                                        </div>

                                        <div class="col-12 col-md-4">
                                            <button type="submit" class="btn btn-primary w-100">
                                                <i class="bx bx-plus"></i> Aggiungi
                                            </button>
                                        </div>
                                    </form>
                                <?php endif; ?>
                            </div>

                            <?php if (empty($students_list)): ?>
                                <p class="text-center text-muted">Nessuno prenotato.</p>
                            <?php else: ?>
                                <table class="table table-sm table-hover">
                                    <thead class="table-light">
                                        <tr>
                                            <th>Nome</th>
                                            <th>Email</th>
                                            <th>Telefono</th>
                                            <th>Stato</th>
                                            <th>Azioni</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        <?php foreach ($students_list as $stud): ?>
                                            <tr>
                                                <td><strong><?php echo htmlspecialchars($stud['name']); ?></strong></td>
                                                <td><?php echo htmlspecialchars($stud['email']); ?></td>
                                                <td><?php echo htmlspecialchars($stud['phone']); ?></td>
                                                <td>
                                                    <span class="badge <?php echo $stud['status'] === 'missed' ? 'bg-warning' : 'bg-success'; ?>">
                                                        <?php echo $stud['status'] === 'missed' ? 'Persa' : 'Prenotato'; ?>
                                                    </span>
                                                </td>
                                                <td>
                                                    <?php if ($stud['status'] !== 'missed'): ?>
                                                        <button type="button" class="btn btn-sm btn-warning me-1"
                                                            data-bs-toggle="modal"
                                                            data-bs-target="#lostModal-<?php echo (int)$stud['booking_id']; ?>">P</button>
                                                    <?php endif; ?>
                                                    <button type="button" class="btn btn-sm btn-danger"
                                                        data-bs-toggle="modal"
                                                        data-bs-target="#cancelModal-<?php echo (int)$stud['booking_id']; ?>">C</button>
                                                </td>
                                            </tr>
                                        <?php endforeach; ?>
                                    </tbody>
                                </table>
                            <?php endif; ?>
                        </div>

                        <div class="modal-footer">
                            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Chiudi</button>
                        </div>
                    </div>
                </div>
            </div>

            <!-- P/C modals -->
            <?php foreach ($students_list as $stud): ?>
                <div class="modal fade" id="lostModal-<?php echo (int)$stud['booking_id']; ?>" tabindex="-1">
                    <div class="modal-dialog">
                        <div class="modal-content">
                            <div class="modal-header bg-warning text-dark">
                                <h5 class="modal-title">Segna come Persa</h5>
                                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                            </div>
                            <div class="modal-body">
                                <p>Confermi di segnare come <strong>persa</strong> la lezione per <strong><?php echo htmlspecialchars($stud['name']); ?></strong>?</p>
                            </div>
                            <div class="modal-footer">
                                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Annulla</button>
                                <form method="POST" style="display:inline;">
                                    <input type="hidden" name="action" value="mark_lost">
                                    <input type="hidden" name="booking_id" value="<?php echo (int)$stud['booking_id']; ?>">
                                    <button type="submit" class="btn btn-warning">Sì, segna persa</button>
                                </form>
                            </div>
                        </div>
                    </div>
                </div>

                <div class="modal fade" id="cancelModal-<?php echo (int)$stud['booking_id']; ?>" tabindex="-1">
                    <div class="modal-dialog">
                        <div class="modal-content">
                            <div class="modal-header bg-danger text-white">
                                <h5 class="modal-title">Rimuovi Prenotazione</h5>
                                <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
                            </div>
                            <div class="modal-body">
                                <p>Confermi di rimuovere <strong><?php echo htmlspecialchars($stud['name']); ?></strong> dalla lezione?</p>
                            </div>
                            <div class="modal-footer">
                                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Annulla</button>
                                <form method="POST" style="display:inline;">
                                    <input type="hidden" name="action" value="cancel_booking">
                                    <input type="hidden" name="booking_id" value="<?php echo (int)$stud['booking_id']; ?>">
                                    <button type="submit" class="btn btn-danger">Sì, rimuovi</button>
                                </form>
                            </div>
                        </div>
                    </div>
                </div>
            <?php endforeach; ?>

            <!-- Delete session modal -->
            <div class="modal fade" id="deleteModal-<?php echo (int)$session['session_id']; ?>" tabindex="-1">
                <div class="modal-dialog">
                    <div class="modal-content">
                        <form method="POST">
                            <div class="modal-header bg-danger text-white">
                                <h5 class="modal-title">Cancella Lezione</h5>
                                <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
                            </div>

                            <div class="modal-body">
                                <p>Confermi la cancellazione della lezione:</p>
                                <ul>
                                    <li><strong>Classe:</strong> <?php echo htmlspecialchars($session['class_name']); ?></li>
                                    <li><strong>Data:</strong> <?php echo date('d/m/Y (l)', strtotime($session['session_date'])); ?></li>
                                    <li><strong>Orario:</strong> <?php echo substr($session['start_time'], 0, 5); ?> - <?php echo substr($session['end_time'], 0, 5); ?></li>
                                    <li><strong>Prenotati:</strong> <?php echo (int)$session['booked_count']; ?></li>
                                </ul>

                                <?php if ((int)$session['booked_count'] > 0): ?>
                                    <div class="form-check mt-3">
                                        <input class="form-check-input" type="checkbox"
                                            name="send_email" value="1"
                                            id="sendEmail-<?php echo (int)$session['session_id']; ?>">
                                        <label class="form-check-label text-primary fw-bold"
                                            for="sendEmail-<?php echo (int)$session['session_id']; ?>">
                                            Invia email di avviso ai <?php echo (int)$session['booked_count']; ?> partecipanti?
                                        </label>
                                    </div>
                                <?php endif; ?>

                                <input type="hidden" name="action" value="delete_session">
                                <input type="hidden" name="session_id" value="<?php echo (int)$session['session_id']; ?>">
                            </div>

                            <div class="modal-footer">
                                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Annulla</button>
                                <button type="submit" class="btn btn-danger">Cancella Lezione</button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>

        <?php endforeach; ?>

        <!-- Email modal -->
        <?php if ($showEmailModal && $emailData): ?>
            <div class="modal fade show" id="emailModal" style="display:block;" tabindex="-1" aria-modal="true">
                <div class="modal-dialog modal-lg">
                    <div class="modal-content">
                        <form method="POST">
                            <div class="modal-header bg-warning text-dark">
                                <h5 class="modal-title">Invia Avviso Cancellazione</h5>
                            </div>
                            <div class="modal-body">
                                <p>Stai per cancellare la lezione. Vuoi inviare l'email a <strong><?php echo count($emailData['recipients']); ?> partecipanti</strong>?</p>

                                <div class="mb-3">
                                    <label class="form-label">Oggetto</label>
                                    <input type="text" class="form-control" value="Lezione cancellata - <?php echo htmlspecialchars($school_name); ?>" readonly>
                                </div>

                                <div class="mb-3">
                                    <label class="form-label">Messaggio (modificabile)</label>
                                    <textarea name="email_body" class="form-control" rows="12" required>Ciao {nome},

ti informiamo con dispiacere che la lezione di <?php echo htmlspecialchars($emailData['class_name']); ?><?php echo $emailData['level'] ? ' (' . ucfirst($emailData['level']) . ')' : ''; ?> 
del <?php echo $emailData['date']; ?> alle ore <?php echo $emailData['time']; ?> è stata cancellata.

Ci scusiamo per il disagio.

Grazie per la comprensione,

<?php echo htmlspecialchars($school_name); ?></textarea>
                                    <small class="text-muted">{nome} verrà sostituito con il nome del destinatario.</small>
                                </div>

                                <input type="hidden" name="session_id" value="<?php echo (int)$emailData['session_id']; ?>">
                            </div>

                            <div class="modal-footer">
                                <button type="submit" name="action" value="skip_cancellation_email" class="btn btn-secondary">
                                    Salta invio
                                </button>
                                <button type="submit" name="action" value="send_cancellation_email" class="btn btn-success">
                                    Invia Email
                                </button>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
            <div class="modal-backdrop fade show"></div>
        <?php endif; ?>

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

    <?php include('jsinclude.php'); ?>
    <script src="assets/plugins/select2/js/select2.min.js"></script>
    <script>
        /* Reminder: Select2 inside any modal must use dropdownParent. */
        document.addEventListener('shown.bs.modal', function(e) {
            const modal = e.target;
            if (!window.jQuery || !jQuery.fn || !jQuery.fn.select2) return;

            modal.querySelectorAll('.select2-user').forEach(function(sel) {
                const $sel = jQuery(sel);
                if ($sel.hasClass('select2-hidden-accessible')) return;

                $sel.select2({
                    dropdownParent: jQuery(modal),
                    width: '100%',
                    placeholder: sel.dataset.placeholder || 'Seleziona...'
                });
            });
        });
    </script>

</body>

</html>