<?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']);

// Neu: Quelle des Aufrufs festlegen für bedingte Logik und Weiterleitung
$source_page = isset($_GET['source']) && $_GET['source'] == 'history' ? 'history' : 'index';
$cancel_link = $source_page === 'history' ? '../history.php' : '../index.php';

// Daten speichern, wenn das Formular abgeschickt wurde
if ($_SERVER["REQUEST_METHOD"] == "POST") {

    // Neu: Daten des Meetings selbst aktualisieren, falls aus der History aufgerufen
    if ($source_page === 'history') {
        $meeting_date = $_POST['meeting_date'];
        $color_id = $_POST['color_id'];
        $reason = $_POST['reason'] ?? null;

        $stmt = mysqli_prepare($conn, "UPDATE meetings SET meeting_date = ?, color_id = ?, reason = ? WHERE id = ?");
        if ($stmt) {
            mysqli_stmt_bind_param($stmt, "sisi", $meeting_date, $color_id, $reason, $meeting_id);
            mysqli_stmt_execute($stmt);
            mysqli_stmt_close($stmt);
        } else {
            die("Fehler beim Vorbereiten der Meeting-Update-Abfrage: " . mysqli_error($conn));
        }
    }

    // Vorhandene Daten für dieses Meeting löschen
    $stmt = mysqli_prepare($conn, "DELETE FROM meeting_teilnehmer 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 meeting_teilnehmer (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)
// ---------------------------------------------------------------------

// Neu: Zusätzliche Meeting-Details für den Edit-Modus abrufen
$stmt = mysqli_prepare($conn, "SELECT m.meeting_date, m.reason, m.color_id, c.name AS color_name FROM meetings m LEFT 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;
}

// Neu: Alle Farben für das Dropdown im Edit-Modus abrufen
$colors = [];
$colors_result = mysqli_query($conn, "SELECT id, name FROM colors ORDER BY name");
if ($colors_result) {
    while ($row = mysqli_fetch_assoc($colors_result)) {
        $colors[] = $row;
    }
}

// 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
$stmt = mysqli_prepare($conn, "SELECT user_id, attended, wore_color, paid FROM meeting_teilnehmer 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>

    <?php if ($source_page === 'index'): ?>
        <p class="text-muted">für das Treffen am <strong><?= date('d.m.Y', strtotime($meeting['meeting_date'])) ?></strong> in der Farbe <strong><?= htmlspecialchars($meeting['color_name']) ?></strong>.</p>
    <?php endif; ?>

    <?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 ?>&source=<?= $source_page ?>" method="post">
                <?php if ($source_page === 'history'): ?>
                    <h5 class="mb-3">Treffen-Details bearbeiten</h5>
                    <div class="row">
                        <div class="col-md-4 mb-3">
                            <label for="meeting_date" class="form-label">Datum des Treffens</label>
                            <input type="datetime-local" class="form-control" id="meeting_date" name="meeting_date" value="<?= date('Y-m-d\TH:i', strtotime($meeting['meeting_date'])) ?>" required>
                        </div>
                        <div class="col-md-4 mb-3">
                            <label for="color_id" class="form-label">Farbvorgabe</label>
                            <select class="form-select" id="color_id" name="color_id" required>
                                <?php foreach ($colors as $color): ?>
                                    <option value="<?= $color['id'] ?>" <?= $meeting['color_id'] == $color['id'] ? 'selected' : '' ?>>
                                        <?= htmlspecialchars($color['name']) ?>
                                    </option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-md-4 mb-3">
                            <label for="reason" class="form-label">Grund (optional)</label>
                            <input type="text" class="form-control" id="reason" name="reason" value="<?= htmlspecialchars($meeting['reason']) ?>">
                        </div>
                    </div>
                    <hr>
                    <h5 class="mb-3">Teilnehmer-Details bearbeiten</h5>
                <?php endif; ?>

                <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="<?= $user['id'] ?>">
                        <?php endforeach; ?>
                    </tbody>
                </table>
                <div class="d-flex justify-content-between mt-3">
                    <button type="submit" class="btn btn-primary">Speichern</button>
                    <a href="<?= htmlspecialchars($cancel_link) ?>" class="btn btn-outline-secondary">Abbrechen</a>
                </div>
            </form>
        </div>
    </div>
</div>

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