domili/admin/participant.php

<?php
include('../inc/check_login.php');
include('../inc/db.php');
require_once '../inc/helpers.php';

$message = '';
$message_type = '';

// Prüfen, ob eine Meeting-ID übergeben wurde
if (!isset($_GET['id'])) {
    header("Location: index.php");
    exit;
}
$meeting_id = htmlspecialchars($_GET['id']);

// Daten speichern, wenn das Formular abgeschickt wurde
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $table_name = "meeting_teilnehmer"; // <<< Korrekter Tabellenname

    // Vorhandene Daten für dieses Meeting löschen, um Duplikate zu vermeiden
    $stmt = mysqli_prepare($conn, "DELETE FROM " . $table_name . " WHERE meeting_id = ?");
    if ($stmt === false) {
        die("Fehler in der SQL-Abfrage: " . mysqli_error($conn));
    }
    mysqli_stmt_bind_param($stmt, "i", $meeting_id);
    mysqli_stmt_execute($stmt);
    mysqli_stmt_close($stmt);

    // Gesendete Daten verarbeiten und speichern
    if (isset($_POST['user_id'])) {
        $stmt_insert = mysqli_prepare($conn, "INSERT INTO " . $table_name . " (meeting_id, user_id, attended, wore_color, paid) VALUES (?, ?, ?, ?, ?)");
        if ($stmt_insert === false) {
            die("Fehler in der SQL-Abfrage: " . mysqli_error($conn));
        }

        foreach ($_POST['user_id'] as $user_id) {
            $attended = isset($_POST['attended'][$user_id]) ? 1 : 0;
            $wore_color = isset($_POST['wore_color'][$user_id]) ? 1 : 0;
            $paid = isset($_POST['paid'][$user_id]) ? 1 : 0;

            mysqli_stmt_bind_param($stmt_insert, "iiiii", $meeting_id, $user_id, $attended, $wore_color, $paid);
            mysqli_stmt_execute($stmt_insert);
        }
        mysqli_stmt_close($stmt_insert);

        $message = "Meeting-Daten erfolgreich gespeichert!";
        $message_type = 'success';
    } else {
        $message = "Keine Benutzerdaten zum Speichern vorhanden.";
        $message_type = 'warning';
    }
}

// ---------------------------------------------------------------------
// Daten für das Formular abrufen (Meetings und Benutzer)
// ---------------------------------------------------------------------

// Meeting-Details abrufen
$stmt = mysqli_prepare($conn, "SELECT m.meeting_date, c.name AS color_name FROM meetings m JOIN colors c ON m.color_id = c.id WHERE m.id = ?");
if ($stmt === false) {
    die("Fehler in der SQL-Abfrage: " . mysqli_error($conn));
}
mysqli_stmt_bind_param($stmt, "i", $meeting_id);
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
$meeting = mysqli_fetch_assoc($result);
mysqli_stmt_close($stmt);

if (!$meeting) {
    header("Location: index.php");
    exit;
}

// Alle Benutzer abrufen
$users = [];
$users_result = mysqli_query($conn, "SELECT id, username AS name FROM users ORDER BY username");
if ($users_result === false) {
    die("Fehler in der SQL-Abfrage: " . mysqli_error($conn));
}
while ($row = mysqli_fetch_assoc($users_result)) {
    $users[] = $row;
}

// Bestehende Feedback-Daten für dieses Meeting abrufen, falls vorhanden
$table_name = "meeting_teilnehmer"; // <<< Korrekter Tabellenname
$stmt = mysqli_prepare($conn, "SELECT user_id, attended, wore_color, paid FROM " . $table_name . " WHERE meeting_id = ?");
if ($stmt === false) {
    die("Fehler in der SQL-Abfrage: " . mysqli_error($conn));
}
mysqli_stmt_bind_param($stmt, "i", $meeting_id);
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
while ($row = mysqli_fetch_assoc($result)) {
    $existing_feedback[$row['user_id']] = $row;
}
mysqli_stmt_close($stmt);

require_once '../inc/header.php';
?>

<div class="container mt-5">
    <h2 class="mb-4">Teilnahme eintragen</h2>
    <p class="text-muted">für das Treffen am <strong><?= date('d.m.Y', strtotime($meeting['meeting_date'])) ?></strong> in der Farbe <strong><?= htmlspecialchars($meeting['color_name']) ?></strong>.</p>

    <?php if ($message): ?>
        <div class="alert alert-<?= $message_type ?> alert-dismissible fade show" role="alert">
            <?= $message ?>
            <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
        </div>
    <?php endif; ?>

    <div class="card shadow mb-4">
        <div class="card-body">
            <form action="participant.php?id=<?= $meeting_id ?>" method="post">
                <table class="table table-striped">
                    <thead>
                        <tr>
                            <th>Benutzer</th>
                            <th class="text-center">Dabei?</th>
                            <th class="text-center">Farbe getragen?</th>
                            <th class="text-center">Gezahlt?</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ($users as $user): ?>
                            <tr>
                                <td><?= htmlspecialchars($user['name']) ?></td>
                                <td class="text-center">
                                    <div class="form-check d-inline-block">
                                        <input class="form-check-input" type="checkbox" name="attended[<?= $user['id'] ?>]" id="attended_<?= $user['id'] ?>" value="1" <?= isset($existing_feedback[$user['id']]) && $existing_feedback[$user['id']]['attended'] ? 'checked' : '' ?>>
                                    </div>
                                </td>
                                <td class="text-center">
                                    <div class="form-check d-inline-block">
                                        <input class="form-check-input" type="checkbox" name="wore_color[<?= $user['id'] ?>]" id="wore_color_<?= $user['id'] ?>" value="1" <?= isset($existing_feedback[$user['id']]) && $existing_feedback[$user['id']]['wore_color'] ? 'checked' : '' ?>>
                                    </div>
                                </td>
                                <td class="text-center">
                                    <div class="form-check d-inline-block">
                                        <input class="form-check-input" type="checkbox" name="paid[<?= $user['id'] ?>]" id="paid_<?= $user['id'] ?>" value="1" <?= isset($existing_feedback[$user['id']]) && $existing_feedback[$user['id']]['paid'] ? 'checked' : '' ?>>
                                    </div>
                                </td>
                            </tr>
                            <input type="hidden" name="user_id[]" value="<?= $user['id'] ?>">
                        <?php endforeach; ?>
                    </tbody>
                </table>
                <div class="d-flex justify-content-between mt-3">
                    <button type="submit" class="btn btn-primary">Speichern</button>
                    <a href="../index.php" class="btn btn-outline-secondary">Abbrechen</a>
                </div>
            </form>
        </div>
    </div>
</div>

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