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

// Die Benutzer-ID wird jetzt sicher aus der Session gelesen.
if (!isset($_SESSION['user_id'])) {
    $logged_in_user_id = 1; // Fallback für Tests
} else {
    $logged_in_user_id = intval($_SESSION['user_id']);
}

// Funktion, um den aktuellen, noch nicht abgeschlossenen Termin zu holen
function get_current_meeting($conn)
{
    $sql = "SELECT id, meeting_date, color_id, reason
            FROM meetings 
            WHERE is_completed = 0
            ORDER BY meeting_date ASC 
            LIMIT 1";
    $result = mysqli_query($conn, $sql);
    if ($result && mysqli_num_rows($result) > 0) {
        return mysqli_fetch_assoc($result);
    }
    return null;
}

// Den aktuellen Termin holen
$row = get_current_meeting($conn);

// Logik: Wenn ein Termin existiert und dessen Datum/Uhrzeit in der Vergangenheit liegt,
// wird er als "abgeschlossen" markiert und der nächste Termin wird geladen.
if ($row && strtotime($row['meeting_date']) < time()) {
    $id_to_complete = $row['id'];
    $sql_update = "UPDATE meetings SET is_completed = 1 WHERE id = ?";
    $stmt_update = mysqli_prepare($conn, $sql_update);
    if ($stmt_update) {
        mysqli_stmt_bind_param($stmt_update, "i", $id_to_complete);
        mysqli_stmt_execute($stmt_update);
        mysqli_stmt_close($stmt_update);
    }
    // Den nächsten (jetzt aktuellen) Termin neu laden
    $row = get_current_meeting($conn);
}

// --- NEUE LOGIK FÜR TEILNAHMEBESTÄTIGUNG ---
if ($row) {
    $meeting_id = $row['id'];
    $user_attendance_status = null;

    // Aktionen aus der URL verarbeiten
    if (isset($_GET['action']) && isset($_GET['meeting_id']) && $_GET['meeting_id'] == $meeting_id) {
        $action = $_GET['action'];
        $rsvp_status_value = null;
        $attended_value = 0;

        if ($action == 'accept') {
            $rsvp_status_value = 'accepted';
            $attended_value = 1;
        } elseif ($action == 'decline') {
            $rsvp_status_value = 'declined';
            $attended_value = 0;
        } elseif ($action == 'maybe') {
            $rsvp_status_value = 'maybe';
            $attended_value = 0;
        }

        if ($rsvp_status_value !== null) {
            // Vorhandenen Eintrag prüfen
            $check_sql = "SELECT rsvp_status FROM meeting_teilnehmer WHERE meeting_id = ? AND user_id = ?";
            $check_stmt = mysqli_prepare($conn, $check_sql);
            if ($check_stmt) {
                mysqli_stmt_bind_param($check_stmt, "ii", $meeting_id, $logged_in_user_id);
                mysqli_stmt_execute($check_stmt);
                $check_result = mysqli_stmt_get_result($check_stmt);
                $existing_attendance = mysqli_fetch_assoc($check_result);
                mysqli_stmt_close($check_stmt);

                if ($existing_attendance) {
                    // Eintrag aktualisieren
                    $update_sql = "UPDATE meeting_teilnehmer SET rsvp_status = ?, attended = ? WHERE meeting_id = ? AND user_id = ?";
                    $update_stmt = mysqli_prepare($conn, $update_sql);
                    if ($update_stmt) {
                        mysqli_stmt_bind_param($update_stmt, "siii", $rsvp_status_value, $attended_value, $meeting_id, $logged_in_user_id);
                        mysqli_stmt_execute($update_stmt);
                        mysqli_stmt_close($update_stmt);
                    }
                } else {
                    // Neuen Eintrag hinzufügen
                    $insert_sql = "INSERT INTO meeting_teilnehmer (meeting_id, user_id, attended, rsvp_status) VALUES (?, ?, ?, ?)";
                    $insert_stmt = mysqli_prepare($conn, $insert_sql);
                    if ($insert_stmt) {
                        mysqli_stmt_bind_param($insert_stmt, "iiis", $meeting_id, $logged_in_user_id, $attended_value, $rsvp_status_value);
                        mysqli_stmt_execute($insert_stmt);
                        mysqli_stmt_close($insert_stmt);
                    }
                }
            }
            header("Location: index.php");
            exit;
        }
    }

    // Status des eingeloggten Nutzers abrufen
    $user_status_sql = "SELECT rsvp_status FROM meeting_teilnehmer WHERE meeting_id = ? AND user_id = ?";
    $user_status_stmt = mysqli_prepare($conn, $user_status_sql);
    if ($user_status_stmt) {
        mysqli_stmt_bind_param($user_status_stmt, "ii", $meeting_id, $logged_in_user_id);
        mysqli_stmt_execute($user_status_stmt);
        $user_status_result = mysqli_stmt_get_result($user_status_stmt);
        $user_status_row = mysqli_fetch_assoc($user_status_result);
        if ($user_status_row) {
            $user_attendance_status = $user_status_row['rsvp_status'];
        }
        mysqli_stmt_close($user_status_stmt);
    }

    // Daten für die Benutzerübersicht abrufen
    $attendees_sql = "SELECT t.rsvp_status, u.username 
                      FROM meeting_teilnehmer AS t
                      LEFT JOIN users AS u ON t.user_id = u.id
                      WHERE t.meeting_id = ?";
    $attendees_stmt = mysqli_prepare($conn, $attendees_sql);
    $accepted_users = [];
    $declined_users = [];
    $maybe_users = [];
    $total_accepted = 0;
    $total_declined = 0;
    $total_maybe = 0;

    if ($attendees_stmt) {
        mysqli_stmt_bind_param($attendees_stmt, "i", $meeting_id);
        mysqli_stmt_execute($attendees_stmt);
        $attendees_result = mysqli_stmt_get_result($attendees_stmt);
        while ($row_user = mysqli_fetch_assoc($attendees_result)) {
            switch ($row_user['rsvp_status']) {
                case 'accepted':
                    $accepted_users[] = htmlspecialchars($row_user['username']);
                    $total_accepted++;
                    break;
                case 'declined':
                    $declined_users[] = htmlspecialchars($row_user['username']);
                    $total_declined++;
                    break;
                case 'maybe':
                    $maybe_users[] = htmlspecialchars($row_user['username']);
                    $total_maybe++;
                    break;
            }
        }
        mysqli_stmt_close($attendees_stmt);
    }

    // --- NEUE LOGIK FÜR DIE BESTIMMUNG DES NÄCHSTEN ZAHLERS ---
    $next_payer_username = null;
    if ($total_accepted > 0) {
        $sql_next_payer = "
            SELECT 
                u.username,
                (SELECT COUNT(*) FROM meeting_teilnehmer WHERE user_id = u.id AND paid = 1) AS paid_count
            FROM meeting_teilnehmer mt
            JOIN users u ON mt.user_id = u.id
            WHERE mt.meeting_id = ? AND mt.rsvp_status = 'accepted'
            ORDER BY paid_count ASC
        ";
        $stmt_next_payer = mysqli_prepare($conn, $sql_next_payer);
        mysqli_stmt_bind_param($stmt_next_payer, "i", $meeting_id);
        mysqli_stmt_execute($stmt_next_payer);
        $result_next_payer = mysqli_stmt_get_result($stmt_next_payer);
        $payer_candidates = [];
        $min_paid_count = -1;

        while ($row_payer = mysqli_fetch_assoc($result_next_payer)) {
            if ($min_paid_count == -1 || $row_payer['paid_count'] < $min_paid_count) {
                $min_paid_count = $row_payer['paid_count'];
                $payer_candidates = [$row_payer['username']];
            } elseif ($row_payer['paid_count'] == $min_paid_count) {
                $payer_candidates[] = $row_payer['username'];
            }
        }
        mysqli_stmt_close($stmt_next_payer);

        if (!empty($payer_candidates)) {
            sort($payer_candidates);
            $next_payer_username = $payer_candidates[0];
        }
    }

    // --- NEUE LOGIK FÜR TERMINVERSCHIEBUNG ---
    if ($row) {
        // Aktive Verschiebungsvorschläge abrufen
        $proposals_sql = "SELECT p.*, u.username as proposer_name, 
                                 COUNT(CASE WHEN v.vote = 'yes' THEN 1 END) as yes_votes,
                                 COUNT(CASE WHEN v.vote = 'no' THEN 1 END) as no_votes,
                                 COUNT(CASE WHEN v.vote = 'maybe' THEN 1 END) as maybe_votes
                          FROM meeting_reschedule_proposals p
                          LEFT JOIN users u ON p.proposed_by_user_id = u.id
                          LEFT JOIN meeting_reschedule_votes v ON p.id = v.proposal_id
                          WHERE p.meeting_id = ? AND p.status = 'pending'
                          GROUP BY p.id
                          ORDER BY p.created_at DESC";
        $proposals_stmt = mysqli_prepare($conn, $proposals_sql);
        $active_proposals = [];
        if ($proposals_stmt) {
            mysqli_stmt_bind_param($proposals_stmt, "i", $meeting_id);
            mysqli_stmt_execute($proposals_stmt);
            $proposals_result = mysqli_stmt_get_result($proposals_stmt);
            while ($proposal = mysqli_fetch_assoc($proposals_result)) {
                $active_proposals[] = $proposal;
            }
            mysqli_stmt_close($proposals_stmt);
        }

        // User-Stimme für aktive Vorschläge abrufen
        $user_votes = [];
        if (!empty($active_proposals)) {
            $vote_sql = "SELECT proposal_id, vote FROM meeting_reschedule_votes 
                         WHERE user_id = ? AND proposal_id IN (" .
                implode(',', array_column($active_proposals, 'id')) . ")";
            $vote_stmt = mysqli_prepare($conn, $vote_sql);
            if ($vote_stmt) {
                mysqli_stmt_bind_param($vote_stmt, "i", $logged_in_user_id);
                mysqli_stmt_execute($vote_stmt);
                $vote_result = mysqli_stmt_get_result($vote_stmt);
                while ($vote = mysqli_fetch_assoc($vote_result)) {
                    $user_votes[$vote['proposal_id']] = $vote['vote'];
                }
                mysqli_stmt_close($vote_stmt);
            }
        }

        // Neue Verschiebung vorschlagen - MIT EINSCHRÄNKUNG (nur eine pro User)
        if (isset($_POST['propose_reschedule']) && isset($_POST['new_date']) && isset($_POST['reason'])) {
            $new_date = $_POST['new_date'];
            $reason = $_POST['reason'];

            // Prüfen, ob User bereits einen Vorschlag eingereicht hat
            $check_existing_sql = "SELECT id FROM meeting_reschedule_proposals 
                                  WHERE meeting_id = ? AND proposed_by_user_id = ? AND status = 'pending'";
            $check_existing_stmt = mysqli_prepare($conn, $check_existing_sql);
            $existing_proposal = null;
            if ($check_existing_stmt) {
                mysqli_stmt_bind_param($check_existing_stmt, "ii", $meeting_id, $logged_in_user_id);
                mysqli_stmt_execute($check_existing_stmt);
                $check_result = mysqli_stmt_get_result($check_existing_stmt);
                $existing_proposal = mysqli_fetch_assoc($check_result);
                mysqli_stmt_close($check_existing_stmt);
            }

            // Nur einreichen, wenn noch kein aktiver Vorschlag existiert
            if (!$existing_proposal) {
                $insert_proposal_sql = "INSERT INTO meeting_reschedule_proposals 
                                       (meeting_id, proposed_by_user_id, proposed_date, reason) 
                                       VALUES (?, ?, ?, ?)";
                $insert_stmt = mysqli_prepare($conn, $insert_proposal_sql);
                if ($insert_stmt) {
                    mysqli_stmt_bind_param($insert_stmt, "iiss", $meeting_id, $logged_in_user_id, $new_date, $reason);
                    mysqli_stmt_execute($insert_stmt);
                    mysqli_stmt_close($insert_stmt);

                    // >>> E-MAIL-BENACHRICHTIGUNG SENDEN <<<
                    require_once __DIR__ . '/vendor/autoload.php';

                    $mail = new \PHPMailer\PHPMailer\PHPMailer(true);
                    try {
                        // SMTP-Konfiguration aus secure.php
                        $mail->isSMTP();
                        $mail->Host       = SMTP_HOST;
                        $mail->SMTPAuth   = true;
                        $mail->Username   = SMTP_USERNAME;
                        $mail->Password   = SMTP_PASSWORD;
                        $mail->SMTPSecure = SMTP_ENCRYPTION;
                        $mail->Port       = SMTP_PORT;

                        $mail->setFrom(MAIL_FROM_ADDRESS, MAIL_FROM_NAME);

                        $proposer_name = $_SESSION['username'] ?? 'Ein Benutzer';
                        $new_date_formatted = date('d.m.Y H:i', strtotime($new_date));
                        $subject = "DoMiLi: Neuer Terminvorschlag für " . date('d.m.Y H:i', strtotime($row['meeting_date']));
                        $message_template = "Hallo %s,\n\n%s hat einen neuen Vorschlag zur Verschiebung des Termins eingereicht.\n\nNeuer vorgeschlagener Termin: %s\nGrund: %s\n\nBitte logge dich ein, um abzustimmen oder den Vorschlag einzusehen.\n\nDein DoMiLi-Team";

                        $participant_sql = "SELECT DISTINCT u.email, u.username
                                            FROM meeting_teilnehmer mt
                                            JOIN users u ON mt.user_id = u.id
                                            WHERE mt.meeting_id = ? AND mt.user_id != ? AND u.email IS NOT NULL AND u.email != ''";
                        $participant_stmt = mysqli_prepare($conn, $participant_sql);
                        mysqli_stmt_bind_param($participant_stmt, "ii", $meeting_id, $logged_in_user_id);
                        mysqli_stmt_execute($participant_stmt);
                        $participants = mysqli_stmt_get_result($participant_stmt);

                        while ($participant = mysqli_fetch_assoc($participants)) {
                            $mail->addAddress($participant['email']);
                            $mail->Subject = $subject;
                            $mail->Body    = sprintf($message_template, $participant['username'], $proposer_name, $new_date_formatted, $reason);
                            $mail->send();
                            $mail->clearAddresses();
                        }

                        $_SESSION['success_message'] = "Vorschlag eingereicht! Alle Teilnehmer wurden per E-Mail benachrichtigt.";
                    } catch (Exception $e) {
                        $_SESSION['error_message'] = "Fehler beim Senden der E-Mails.";
                        error_log("PHPMailer Error: " . $mail->ErrorInfo);
                    }
                }
            } else {
                $_SESSION['error_message'] = "Du hast bereits einen Verschiebungsvorschlag eingereicht. Bitte lösche zuerst deinen bestehenden Vorschlag.";
            }
            header("Location: index.php");
            exit;
        }

        // Für Vorschlag abstimmen
        if (isset($_POST['vote_proposal']) && isset($_POST['proposal_id'])) {
            $proposal_id = intval($_POST['proposal_id']);
            $vote = $_POST['vote_proposal'];

            if (!in_array($vote, ['yes', 'no', 'maybe'])) {
                error_log("Ungültige Abstimmung: " . $vote);
                header("Location: index.php");
                exit;
            }

            error_log("Abstimmung empfangen: proposal_id=$proposal_id, vote=$vote, user_id=$logged_in_user_id");

            // Vorhandene Stimme prüfen
            $check_vote_sql = "SELECT id FROM meeting_reschedule_votes 
                              WHERE proposal_id = ? AND user_id = ?";
            $check_stmt = mysqli_prepare($conn, $check_vote_sql);
            $existing_vote = null;
            if ($check_stmt) {
                mysqli_stmt_bind_param($check_stmt, "ii", $proposal_id, $logged_in_user_id);
                mysqli_stmt_execute($check_stmt);
                $check_result = mysqli_stmt_get_result($check_stmt);
                $existing_vote = mysqli_fetch_assoc($check_result);
                mysqli_stmt_close($check_stmt);

                error_log("Vorhandene Stimme gefunden: " . ($existing_vote ? "Ja (ID: " . $existing_vote['id'] . ")" : "Nein"));

                if ($existing_vote) {
                    // Stimme aktualisieren
                    $update_vote_sql = "UPDATE meeting_reschedule_votes 
                                       SET vote = ? WHERE id = ?";
                    $update_stmt = mysqli_prepare($conn, $update_vote_sql);
                    if ($update_stmt) {
                        mysqli_stmt_bind_param($update_stmt, "si", $vote, $existing_vote['id']);
                        $result = mysqli_stmt_execute($update_stmt);
                        error_log("Stimme aktualisiert: " . ($result ? "Erfolg" : "Fehler"));
                        mysqli_stmt_close($update_stmt);
                    }
                } else {
                    // Neue Stimme abgeben
                    $insert_vote_sql = "INSERT INTO meeting_reschedule_votes 
                                       (proposal_id, user_id, vote) VALUES (?, ?, ?)";
                    $insert_stmt = mysqli_prepare($conn, $insert_vote_sql);
                    if ($insert_stmt) {
                        mysqli_stmt_bind_param($insert_stmt, "iis", $proposal_id, $logged_in_user_id, $vote);
                        $result = mysqli_stmt_execute($insert_stmt);
                        error_log("Neue Stimme eingefügt: " . ($result ? "Erfolg" : "Fehler"));
                        error_log("Affected rows: " . mysqli_stmt_affected_rows($insert_stmt));
                        mysqli_stmt_close($insert_stmt);
                    }
                }
            }
            header("Location: index.php");
            exit;
        }

        // Vorschlag löschen (nur vom Ersteller)
        if (isset($_POST['delete_proposal']) && isset($_POST['proposal_id'])) {
            $proposal_id = $_POST['proposal_id'];
            $check_owner_sql = "SELECT proposed_by_user_id FROM meeting_reschedule_proposals 
                               WHERE id = ? AND meeting_id = ?";
            $check_owner_stmt = mysqli_prepare($conn, $check_owner_sql);
            if ($check_owner_stmt) {
                mysqli_stmt_bind_param($check_owner_stmt, "ii", $proposal_id, $meeting_id);
                mysqli_stmt_execute($check_owner_stmt);
                $check_owner_result = mysqli_stmt_get_result($check_owner_stmt);
                $proposal_owner = mysqli_fetch_assoc($check_owner_result);
                mysqli_stmt_close($check_owner_stmt);

                if ($proposal_owner && $proposal_owner['proposed_by_user_id'] == $logged_in_user_id) {
                    $delete_votes_sql = "DELETE FROM meeting_reschedule_votes WHERE proposal_id = ?";
                    $delete_votes_stmt = mysqli_prepare($conn, $delete_votes_sql);
                    if ($delete_votes_stmt) {
                        mysqli_stmt_bind_param($delete_votes_stmt, "i", $proposal_id);
                        mysqli_stmt_execute($delete_votes_stmt);
                        mysqli_stmt_close($delete_votes_stmt);
                    }

                    $delete_proposal_sql = "DELETE FROM meeting_reschedule_proposals WHERE id = ?";
                    $delete_proposal_stmt = mysqli_prepare($conn, $delete_proposal_sql);
                    if ($delete_proposal_stmt) {
                        mysqli_stmt_bind_param($delete_proposal_stmt, "i", $proposal_id);
                        mysqli_stmt_execute($delete_proposal_stmt);
                        mysqli_stmt_close($delete_proposal_stmt);
                    }
                }
            }
            header("Location: index.php");
            exit;
        }

        // Vorschlag bearbeiten (nur vom Ersteller)
        if (isset($_POST['edit_proposal']) && isset($_POST['proposal_id']) && isset($_POST['new_date']) && isset($_POST['reason'])) {
            $proposal_id = $_POST['proposal_id'];
            $new_date = $_POST['new_date'];
            $reason = $_POST['reason'];

            $check_owner_sql = "SELECT proposed_by_user_id FROM meeting_reschedule_proposals 
                               WHERE id = ? AND meeting_id = ?";
            $check_owner_stmt = mysqli_prepare($conn, $check_owner_sql);
            if ($check_owner_stmt) {
                mysqli_stmt_bind_param($check_owner_stmt, "ii", $proposal_id, $meeting_id);
                mysqli_stmt_execute($check_owner_stmt);
                $check_owner_result = mysqli_stmt_get_result($check_owner_stmt);
                $proposal_owner = mysqli_fetch_assoc($check_owner_result);
                mysqli_stmt_close($check_owner_stmt);

                if ($proposal_owner && $proposal_owner['proposed_by_user_id'] == $logged_in_user_id) {
                    $delete_votes_sql = "DELETE FROM meeting_reschedule_votes WHERE proposal_id = ?";
                    $delete_votes_stmt = mysqli_prepare($conn, $delete_votes_sql);
                    if ($delete_votes_stmt) {
                        mysqli_stmt_bind_param($delete_votes_stmt, "i", $proposal_id);
                        mysqli_stmt_execute($delete_votes_stmt);
                        mysqli_stmt_close($delete_votes_stmt);
                    }

                    $update_proposal_sql = "UPDATE meeting_reschedule_proposals 
                                           SET proposed_date = ?, reason = ? 
                                           WHERE id = ?";
                    $update_proposal_stmt = mysqli_prepare($conn, $update_proposal_sql);
                    if ($update_proposal_stmt) {
                        mysqli_stmt_bind_param($update_proposal_stmt, "ssi", $new_date, $reason, $proposal_id);
                        mysqli_stmt_execute($update_proposal_stmt);
                        mysqli_stmt_close($update_proposal_stmt);
                    }
                }
            }
            header("Location: index.php");
            exit;
        }

        // Vorschlag annehmen (nur Admin)
        if (isset($_POST['accept_proposal']) && isset($_POST['proposal_id'])) {
            if (isset($_SESSION['role']) && $_SESSION['role'] == 'admin') {
                $proposal_id = $_POST['proposal_id'];
                $accept_sql = "UPDATE meeting_reschedule_proposals 
                              SET status = 'accepted' 
                              WHERE id = ?";
                $accept_stmt = mysqli_prepare($conn, $accept_sql);
                if ($accept_stmt) {
                    mysqli_stmt_bind_param($accept_stmt, "i", $proposal_id);
                    mysqli_stmt_execute($accept_stmt);
                    mysqli_stmt_close($accept_stmt);
                }
                header("Location: index.php");
                exit;
            }
        }

        // Vorschlag ablehnen (nur Admin)
        if (isset($_POST['reject_proposal']) && isset($_POST['proposal_id'])) {
            if (isset($_SESSION['role']) && $_SESSION['role'] == 'admin') {
                $proposal_id = $_POST['proposal_id'];
                $reject_sql = "UPDATE meeting_reschedule_proposals 
                              SET status = 'rejected' 
                              WHERE id = ?";
                $reject_stmt = mysqli_prepare($conn, $reject_sql);
                if ($reject_stmt) {
                    mysqli_stmt_bind_param($reject_stmt, "i", $proposal_id);
                    mysqli_stmt_execute($reject_stmt);
                    mysqli_stmt_close($reject_stmt);
                }
                header("Location: index.php");
                exit;
            }
        }
    }
}

include('inc/header.php');

$german_weekdays = [
    'Mon' => 'Mo.',
    'Tue' => 'Di.',
    'Wed' => 'Mi.',
    'Thu' => 'Do.',
    'Fri' => 'Fr.',
    'Sat' => 'Sa.',
    'Sun' => 'So.',
];
?>

<div class="container py-0">
    <!-- Erfolgsmeldung anzeigen -->
    <?php if (isset($_SESSION['success_message'])): ?>
        <div class="alert alert-info alert-dismissible fade show" role="alert">
            <?= htmlspecialchars($_SESSION['success_message']) ?>
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        </div>
        <?php unset($_SESSION['success_message']); ?>
    <?php endif; ?>

    <!-- Fehlermeldung anzeigen -->
    <?php if (isset($_SESSION['error_message'])): ?>
        <div class="alert alert-warning alert-dismissible fade show" role="alert">
            <?= htmlspecialchars($_SESSION['error_message']) ?>
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        </div>
        <?php unset($_SESSION['error_message']); ?>
    <?php endif; ?>

    <div class="text-center mb-4">
        <h2 class="fw-bold">Farbe des nächsten Treffens</h2>
    </div>

    <?php if ($row): ?>
        <?php
        $english_weekday = date('D', strtotime($row['meeting_date']));
        $german_weekday = $german_weekdays[$english_weekday] ?? '';
        $color_sql = "SELECT * FROM colors WHERE id = ?";
        $color_stmt = mysqli_prepare($conn, $color_sql);
        mysqli_stmt_bind_param($color_stmt, "i", $row['color_id']);
        mysqli_stmt_execute($color_stmt);
        $color_result = mysqli_stmt_get_result($color_stmt);
        $color_row = mysqli_fetch_assoc($color_result);
        ?>
        <div class="card mx-auto bg-light shadow" style="max-width: 500px;">
            <div class="card-body text-center">
                <div class="rounded-4 mb-3 mx-auto d-flex flex-column justify-content-center align-items-center color-box" style="background-image: linear-gradient(135deg, <?= htmlspecialchars($color_row['hex_code']) ?>, <?= darken_color($color_row['hex_code']) ?>);">
                    <p class="fs-5 fw-semibold m-0" style="color: <?= get_readable_text_color($color_row['hex_code']) ?>;"><?= htmlspecialchars($color_row['name']) ?></p>
                    <p class="fs-6 fw-normal m-0" style="color: <?= get_readable_text_color($color_row['hex_code']) ?>;"><?= htmlspecialchars($row['reason']) ?></p>
                </div>
                <p class="text-muted">nächster Termin:</p>
                <p class="text-muted h3 fw-bold mb-2"><?= $german_weekday . ' ' . date('d.m.Y H:i', strtotime($row['meeting_date'])) ?></p>

                <div class="mt-3 mb-2">
                    <button class="btn btn-sm btn-outline-primary" type="button" data-bs-toggle="collapse" data-bs-target="#rescheduleForm" aria-expanded="false" aria-controls="rescheduleForm">
                        Terminverschiebung vorschlagen
                    </button>
                </div>
            </div>

            <div class="d-flex justify-content-center pt-2 pb-3" style="max-width: 500px; margin-left: auto; margin-right: auto; flex-direction: column; align-items: center;">
                <?php if ($user_attendance_status === 'accepted'): ?>
                    <p class="text-success fw-bold mb-4">Du hast zugesagt!</p>
                    <div class="d-flex justify-content-center">
                        <a href="index.php?action=decline&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-danger me-2">Absagen</a>
                        <a href="index.php?action=maybe&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-info">noch unklar</a>
                    </div>
                <?php elseif ($user_attendance_status === 'declined'): ?>
                    <p class="text-danger fw-bold mb-4">Du hast abgesagt!</p>
                    <div class="d-flex justify-content-center">
                        <a href="index.php?action=accept&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-success me-2">Zusagen</a>
                        <a href="index.php?action=maybe&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-info">noch unklar</a>
                    </div>
                <?php elseif ($user_attendance_status === 'maybe'): ?>
                    <p class="text-muted fw-bold mb-4">Vielleicht dabei!</p>
                    <div class="d-flex justify-content-center">
                        <a href="index.php?action=accept&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-success me-2">Zusagen</a>
                        <a href="index.php?action=decline&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-danger">Absagen</a>
                    </div>
                <?php else: ?>
                    <p class="text-muted fw-bold mb-4">Bist du dabei?</p>
                    <div class="d-flex justify-content-center">
                        <a href="index.php?action=accept&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-success me-2">Zusagen</a>
                        <a href="index.php?action=decline&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-danger me-2">Absagen</a>
                        <a href="index.php?action=maybe&meeting_id=<?= htmlspecialchars($meeting_id); ?>" class="btn btn-sm btn-outline-info">Vielleicht</a>
                    </div>
                <?php endif; ?>
            </div>

            <?php if ($next_payer_username): ?>
                <div class="text-center my-2 mx-auto" style="max-width: 500px;  border-radius: 0.5rem;">
                    <p class="fw-bold mb-1">Rechnung wird bezahlt von:</p>
                    <h4 class="text-muted fw-bold mb-0"><?= htmlspecialchars($next_payer_username); ?></h4>
                </div>
            <?php endif; ?>

            <div class="d-flex justify-content-center my-3" style="max-width: 500px; margin-left: auto; margin-right: auto;">
                <a href="admin/participant.php?id=<?= htmlspecialchars($row['id']) ?>" class="btn btn-sm btn-outline-secondary">Teilnahme eintragen</a>
            </div>

            <div class="card-footer text-center mt-3">
                <p class="text-muted mb-1">Teilnehmerübersicht:</p>
                <div class="d-flex justify-content-around">
                    <div class="text-center">
                        <p class="text-success mb-1 small">
                            <a class="text-success text-decoration-none participant-toggle-collapse" href="#acceptedCollapse" role="button" aria-expanded="false" aria-controls="acceptedCollapse">
                                Zusagen: <?= $total_accepted; ?>
                            </a>
                        </p>
                        <div class="collapse mt-2" id="acceptedCollapse">
                            <?php if (!empty($accepted_users)): ?>
                                <ul class="list-unstyled mb-0">
                                    <?php foreach ($accepted_users as $user): ?>
                                        <li class="small">
                                            <?= $user; ?>
                                        </li>
                                    <?php endforeach; ?>
                                </ul>
                            <?php else: ?>
                                <p class="mb-0 text-muted small">Keine</p>
                            <?php endif; ?>
                        </div>
                    </div>
                    <div class="text-center">
                        <p class="text-danger mb-1 small">
                            <a class="text-danger text-decoration-none participant-toggle-collapse" href="#declinedCollapse" role="button" aria-expanded="false" aria-controls="declinedCollapse">
                                Absagen: <?= $total_declined; ?>
                            </a>
                        </p>
                        <div class="collapse mt-2" id="declinedCollapse">
                            <?php if (!empty($declined_users)): ?>
                                <ul class="list-unstyled mb-0">
                                    <?php foreach ($declined_users as $user): ?>
                                        <li class="small">
                                            <?= $user; ?>
                                        </li>
                                    <?php endforeach; ?>
                                </ul>
                            <?php else: ?>
                                <p class="mb-0 text-muted small">Keine</p>
                            <?php endif; ?>
                        </div>
                    </div>
                    <div class="text-center">
                        <p class="text-warning mb-1 small">
                            <a class="text-info text-decoration-none participant-toggle-collapse" href="#maybeCollapse" role="button" aria-expanded="false" aria-controls="maybeCollapse">
                                Vielleicht: <?= $total_maybe; ?>
                            </a>
                        </p>
                        <div class="collapse mt-2" id="maybeCollapse">
                            <?php if (!empty($maybe_users)): ?>
                                <ul class="list-unstyled mb-0">
                                    <?php foreach ($maybe_users as $user): ?>
                                        <li class="small">
                                            <?= $user; ?>
                                        </li>
                                    <?php endforeach; ?>
                                </ul>
                            <?php else: ?>
                                <p class="mb-0 text-muted small">Keine</p>
                            <?php endif; ?>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <?php if ($row): ?>
            <!-- Aktive Verschiebungsvorschläge -->
            <?php if (!empty($active_proposals)): ?>
                <div class="mt-4">
                    <h5 class="text-center">Aktive Verschiebungsvorschläge</h5>
                    <?php foreach ($active_proposals as $proposal): ?>
                        <div class="card mt-3 mx-auto" style="max-width: 500px;">
                            <div class="card-body">
                                <h6 class="card-title">
                                    Vorschlag von <?= htmlspecialchars($proposal['proposer_name']) ?>
                                    <?php if ($proposal['proposed_by_user_id'] == $logged_in_user_id): ?>
                                        <span class="float-end">
                                            <button class="btn btn-sm btn-outline-primary d-inline-flex align-items-center justify-content-center" type="button" data-bs-toggle="collapse" data-bs-target="#editProposal<?= $proposal['id'] ?>" aria-expanded="false" aria-controls="editProposal<?= $proposal['id'] ?>">
                                                <span class="material-icons" style="font-size: 16px; vertical-align: middle;">edit_calendar</span>
                                            </button>
                                            <form method="POST" class="d-inline" onsubmit="return confirm('Vorschlag wirklich löschen? Alle Abstimmungen werden gelöscht.')">
                                                <input type="hidden" name="proposal_id" value="<?= $proposal['id'] ?>">
                                                <button type="submit" name="delete_proposal" class="btn btn-sm btn-outline-danger d-inline-flex align-items-center justify-content-center ms-1">
                                                    <span class="material-icons" style="font-size: 16px; vertical-align: middle;">delete_outline</span>
                                                </button>
                                            </form>
                                        </span>
                                    <?php endif; ?>
                                </h6>

                                <!-- Edit-Formular (nur für Ersteller sichtbar) -->
                                <?php if ($proposal['proposed_by_user_id'] == $logged_in_user_id): ?>
                                    <div class="collapse mt-3" id="editProposal<?= $proposal['id'] ?>">
                                        <div class="card card-body bg-light">
                                            <h6>Bearbeiten</h6>
                                            <form method="POST">
                                                <input type="hidden" name="proposal_id" value="<?= $proposal['id'] ?>">
                                                <div class="mb-2">
                                                    <label for="edit_date_<?= $proposal['id'] ?>" class="form-label">Neuer Termin:</label>
                                                    <input type="datetime-local" class="form-control" id="edit_date_<?= $proposal['id'] ?>" name="new_date" value="<?= date('Y-m-d\TH:i', strtotime($proposal['proposed_date'])) ?>" required>
                                                </div>
                                                <div class="mb-2">
                                                    <label for="edit_reason_<?= $proposal['id'] ?>" class="form-label">Grund/Bemerkung:</label>
                                                    <textarea class="form-control" id="edit_reason_<?= $proposal['id'] ?>" name="reason" rows="2" required><?= htmlspecialchars($proposal['reason']) ?></textarea>
                                                </div>
                                                <button type="submit" name="edit_proposal" class="btn btn-primary btn-sm">
                                                    Speichern
                                                </button>
                                            </form>
                                        </div>
                                    </div>
                                <?php endif; ?>

                                <p class="card-text mb-2">
                                    <strong>Neuer Termin:</strong> <?= date('d.m.Y H:i', strtotime($proposal['proposed_date'])) ?><br>
                                    <strong>Grund:</strong> <?= htmlspecialchars($proposal['reason']) ?><br>
                                    <strong>Erstellt:</strong> <?= date('d.m.Y H:i', strtotime($proposal['created_at'])) ?>
                                </p>

                                <!-- Für mich OK - Abstimmung -->
                                <div class="d-flex justify-content-between align-items-center mb-2">
                                    <div class="flex-grow-1">
                                        <strong>Für mich OK:</strong>
                                    </div>
                                    <div class="flex-shrink-0">
                                        <form method="POST" class="d-inline">
                                            <input type="hidden" name="proposal_id" value="<?= $proposal['id'] ?>">
                                            <?php if (!isset($user_votes[$proposal['id']])): ?>
                                                <button type="submit" name="vote_proposal" value="yes" class="btn btn-xs btn-outline-success btn-sm py-1 px-2 me-1">
                                                    Ja
                                                </button>
                                                <button type="submit" name="vote_proposal" value="no" class="btn btn-xs btn-outline-danger btn-sm py-1 px-2">
                                                    Nein
                                                </button>
                                            <?php else: ?>
                                                <?php if ($user_votes[$proposal['id']] == 'yes'): ?>
                                                    <button type="submit" name="vote_proposal" value="yes" class="btn btn-xs btn-success btn-sm py-1 px-2 me-1" disabled>
                                                        Ja
                                                    </button>
                                                    <button type="submit" name="vote_proposal" value="no" class="btn btn-xs btn-outline-danger btn-sm py-1 px-2">
                                                        Nein
                                                    </button>
                                                <?php else: ?>
                                                    <button type="submit" name="vote_proposal" value="yes" class="btn btn-xs btn-outline-success btn-sm py-1 px-2 me-1">
                                                        Ja
                                                    </button>
                                                    <button type="submit" name="vote_proposal" value="no" class="btn btn-xs btn-danger btn-sm py-1 px-2" disabled>
                                                        Nein
                                                    </button>
                                                <?php endif; ?>
                                            <?php endif; ?>
                                        </form>
                                    </div>
                                </div>

                                <!-- Verschiebung zustimmen - nur für Admins -->
                                <?php if (isset($_SESSION['role']) && $_SESSION['role'] == 'admin'): ?>
                                    <div class="d-flex justify-content-between align-items-center">
                                        <div class="flex-grow-1">
                                            <strong>Verschiebung zustimmen:</strong>
                                        </div>
                                        <div class="flex-shrink-0">
                                            <form method="POST" class="d-inline">
                                                <input type="hidden" name="proposal_id" value="<?= $proposal['id'] ?>">
                                                <button type="submit" name="accept_proposal" class="btn btn-xs btn-outline-success btn-sm py-1 px-2 me-1" title="Vorschlag annehmen">
                                                    <span class="material-icons" style="font-size: 14px; vertical-align: middle;">check</span>
                                                </button>
                                                <button type="submit" name="reject_proposal" class="btn btn-xs btn-outline-danger btn-sm py-1 px-2" title="Vorschlag ablehnen">
                                                    <span class="material-icons" style="font-size: 14px; vertical-align: middle;">close</span>
                                                </button>
                                            </form>
                                        </div>
                                    </div>
                                <?php endif; ?>
                            </div>

                            <div class="card-footer text-center mt-3">
                                <p class="text-muted mb-1">Rückmeldung zur Verschiebung:</p>
                                <div class="d-flex justify-content-around">
                                    <div class="text-center">
                                        <p class="text-success mb-1 small">
                                            <a class="text-success text-decoration-none participant-toggle-collapse" href="#yesCollapse<?= $proposal['id'] ?>" role="button" aria-expanded="false" aria-controls="yesCollapse<?= $proposal['id'] ?>">
                                                Ja: <?= $proposal['yes_votes'] ?>
                                            </a>
                                        </p>
                                        <div class="collapse mt-2" id="yesCollapse<?= $proposal['id'] ?>">
                                            <?php
                                            $yes_voters_sql = "SELECT u.username FROM meeting_reschedule_votes v 
                                                  LEFT JOIN users u ON v.user_id = u.id 
                                                  WHERE v.proposal_id = ? AND v.vote = 'yes'";
                                            $yes_voters_stmt = mysqli_prepare($conn, $yes_voters_sql);
                                            $yes_voters = [];
                                            if ($yes_voters_stmt) {
                                                mysqli_stmt_bind_param($yes_voters_stmt, "i", $proposal['id']);
                                                mysqli_stmt_execute($yes_voters_stmt);
                                                $yes_voters_result = mysqli_stmt_get_result($yes_voters_stmt);
                                                while ($voter = mysqli_fetch_assoc($yes_voters_result)) {
                                                    $yes_voters[] = htmlspecialchars($voter['username']);
                                                }
                                                mysqli_stmt_close($yes_voters_stmt);
                                            }
                                            ?>
                                            <?php if (!empty($yes_voters)): ?>
                                                <ul class="list-unstyled mb-0">
                                                    <?php foreach ($yes_voters as $voter): ?>
                                                        <li class="small">
                                                            <?= $voter ?>
                                                        </li>
                                                    <?php endforeach; ?>
                                                </ul>
                                            <?php else: ?>
                                                <p class="mb-0 text-muted small">Keine</p>
                                            <?php endif; ?>
                                        </div>
                                    </div>
                                    <div class="text-center">
                                        <p class="text-danger mb-1 small">
                                            <a class="text-danger text-decoration-none participant-toggle-collapse" href="#noCollapse<?= $proposal['id'] ?>" role="button" aria-expanded="false" aria-controls="noCollapse<?= $proposal['id'] ?>">
                                                Nein: <?= $proposal['no_votes'] ?>
                                            </a>
                                        </p>
                                        <div class="collapse mt-2" id="noCollapse<?= $proposal['id'] ?>">
                                            <?php
                                            $no_voters_sql = "SELECT u.username FROM meeting_reschedule_votes v 
                                                 LEFT JOIN users u ON v.user_id = u.id 
                                                 WHERE v.proposal_id = ? AND v.vote = 'no'";
                                            $no_voters_stmt = mysqli_prepare($conn, $no_voters_sql);
                                            $no_voters = [];
                                            if ($no_voters_stmt) {
                                                mysqli_stmt_bind_param($no_voters_stmt, "i", $proposal['id']);
                                                mysqli_stmt_execute($no_voters_stmt);
                                                $no_voters_result = mysqli_stmt_get_result($no_voters_stmt);
                                                while ($voter = mysqli_fetch_assoc($no_voters_result)) {
                                                    $no_voters[] = htmlspecialchars($voter['username']);
                                                }
                                                mysqli_stmt_close($no_voters_stmt);
                                            }
                                            ?>
                                            <?php if (!empty($no_voters)): ?>
                                                <ul class="list-unstyled mb-0">
                                                    <?php foreach ($no_voters as $voter): ?>
                                                        <li class="small">
                                                            <?= $voter ?>
                                                        </li>
                                                    <?php endforeach; ?>
                                                </ul>
                                            <?php else: ?>
                                                <p class="mb-0 text-muted small">Keine</p>
                                            <?php endif; ?>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    <?php endforeach; ?>
                    <!-- Zusätzlicher Freiraum unter der letzten Karte -->
                    <div class="mb-5"></div>
                </div>
            <?php endif; ?>
        <?php endif; ?>

    <?php else: ?>
        <div class="alert alert-warning text-center">
            Keine anstehenden Termine gefunden.
        </div>
    <?php endif; ?>
</div>

<!-- Formular für Verschiebungsvorschlag -->
<div class="collapse" id="rescheduleForm">
    <div class="card card-body bg-light mt-3 mx-auto" style="max-width: 500px;">
        <h5>Anderen Termin vorschlagen</h5>
        <form method="POST">
            <div class="mb-3">
                <label for="new_date" class="form-label">Neuer Termin:</label>
                <input type="datetime-local" class="form-control" id="new_date" name="new_date" value="<?= date('Y-m-d\TH:i', strtotime($row['meeting_date'])) ?>" required>
            </div>
            <div class="mb-3">
                <label for="reason" class="form-label">Grund/Bemerkung:</label>
                <textarea class="form-control" id="reason" name="reason" rows="2" placeholder="Warum soll der Termin verschoben werden?"></textarea>
            </div>
            <div class="d-flex gap-2">
                <button type="submit" name="propose_reschedule" class="btn btn-sm btn-outline-primary">
                    Vorschlag einreichen
                </button>
                <button type="button" class="btn btn-sm btn-outline-secondary" data-bs-toggle="collapse" data-bs-target="#rescheduleForm">
                    Abbrechen
                </button>
            </div>
        </form>
    </div>
</div>

<script>
    // Dies ist ein einfaches JavaScript, um alle drei Listen gleichzeitig ein- und auszuklappen.
    document.addEventListener('DOMContentLoaded', function() {
        // Wählt nur die Links mit der spezifischen Klasse aus
        const links = document.querySelectorAll('.participant-toggle-collapse');
        // Wählt nur die Collapse-Elemente innerhalb des .card-footer aus
        const collapseElements = document.querySelectorAll('.card-footer .collapse');
        links.forEach(link => {
            link.addEventListener('click', function(e) {
                // Verhindert das Standardverhalten des Links (Springen zur ID)
                e.preventDefault();
                // Überprüft, ob das erste Element sichtbar ist
                const isExpanded = collapseElements[0].classList.contains('show');
                // Fügt die "show"-Klasse zu allen Elementen hinzu oder entfernt sie
                collapseElements.forEach(el => {
                    if (isExpanded) {
                        el.classList.remove('show');
                    } else {
                        el.classList.add('show');
                    }
                });
                // Aktualisiert den aria-expanded-Status für Barrierefreiheit
                links.forEach(l => {
                    l.setAttribute('aria-expanded', !isExpanded);
                });
            });
        });
    });

    if ('serviceWorker' in navigator) {
        window.addEventListener('load', function() {
            navigator.serviceWorker.register('/sw.js')
                .then(function(registration) {
                    console.log('DoMiLi Service Worker registriert');
                })
                .catch(function(err) {
                    console.log('Service Worker Registrierung fehlgeschlagen:', err);
                });
        });
    }
</script>

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