let currentUser = null;
let currentDataType = null;
let currentData = [];

// Beim Laden der Seite
document.addEventListener('DOMContentLoaded', function () {
    checkAuth();
    loadStatistics();

    // Add cookie settings button functionality
    const cookieSettingsBtn = document.getElementById('cookie-settings-footer');
    if (cookieSettingsBtn) {
        cookieSettingsBtn.addEventListener('click', function () {
            if (window.cookieConsent) {
                window.cookieConsent.resetConsent();
            }
        });
    }
    loadPageStatistics();
    setupEventListeners();
});

function setupEventListeners() {
    // Logout Button
    document.getElementById('logoutBtn').addEventListener('click', logout);

    // Generator Button
    document.getElementById('generatorBtn').addEventListener('click', function () {
        window.location.href = '/generator';
    });

    // Modal Close Buttons
    document.querySelectorAll('.close').forEach(closeBtn => {
        closeBtn.addEventListener('click', closeModal);
    });

    // Confirm Modal Buttons
    document.getElementById('confirmNo').addEventListener('click', closeModal);

    // Search Input
    document.getElementById('searchInput').addEventListener('input', filterData);

    // Add Form
    document.getElementById('addForm').addEventListener('submit', handleAddSubmit);
}

async function checkAuth() {
    try {
        const response = await fetch('/api/v1/web/check-session');
        const result = await response.json();

        if (!result.success) {
            window.location.href = '/adminlogin.html';
            return;
        }

        currentUser = result.user;
        document.getElementById('username').textContent = currentUser.username;

        const accessBadge = document.getElementById('accessBadge');
        accessBadge.textContent = `Level ${currentUser.access_level}`;
        accessBadge.className = `access-badge level-${currentUser.access_level}`;

        // Generator-Button nur für Level 2
        if (currentUser.access_level >= 2) {
            document.getElementById('generatorBtn').style.display = 'inline-block';
        }

    } catch (error) {
        console.error('Auth check failed:', error);
        window.location.href = '/adminlogin.html';
    }
}

async function logout() {
    try {
        await fetch('/api/v1/public/logout', { method: 'POST' });
        window.location.href = '/adminlogin.html';
    } catch (error) {
        console.error('Logout failed:', error);
        window.location.href = '/adminlogin.html';
    }
}

async function loadStatistics() {
    try {
        const response = await fetch('/api/v1/admin/stats');
        const stats = await response.json();

        if (stats.success) {
            document.getElementById('totalPlayers').textContent = stats.data.players || 0;
            document.getElementById('totalRuns').textContent = stats.data.runs || 0;
            document.getElementById('totalLocations').textContent = stats.data.locations || 0;
            document.getElementById('totalAdminUsers').textContent = stats.data.adminUsers || 0;
        }
    } catch (error) {
        console.error('Failed to load statistics:', error);
    }
}

async function loadPageStatistics() {
    try {
        const response = await fetch('/api/v1/admin/page-stats');
        const result = await response.json();

        if (result.success) {
            const data = result.data;

            // Display page view statistics
            displayPageStats('todayStats', data.today);
            displayPageStats('weekStats', data.week);
            displayPageStats('monthStats', data.month);
            displayPageStats('totalStats', data.total);

            // Display link statistics
            if (data.linkStats) {
                document.getElementById('totalPlayersCount').textContent = data.linkStats.total_players || 0;
                document.getElementById('linkedPlayersCount').textContent = data.linkStats.linked_players || 0;
                document.getElementById('linkPercentage').textContent = `${data.linkStats.link_percentage || 0}%`;
            }
        }
    } catch (error) {
        console.error('Failed to load page statistics:', error);
        // Show error in all stat containers
        ['todayStats', 'weekStats', 'monthStats', 'totalStats'].forEach(id => {
            document.getElementById(id).innerHTML = '<div style="color: #dc3545;">Fehler beim Laden</div>';
        });
    }
}

function displayPageStats(containerId, stats) {
    const container = document.getElementById(containerId);

    if (!stats || stats.length === 0) {
        container.innerHTML = '<div style="color: #6c757d;">0</div>';
        return;
    }

    // Find main page visits
    const mainPageStat = stats.find(stat => stat.page === 'main_page_visit');
    const count = mainPageStat ? mainPageStat.count : 0;

    container.innerHTML = `<div style="font-size: 1.5em; font-weight: bold; color: #00d4ff;">${count}</div>`;
}

function getPageDisplayName(page) {
    const pageNames = {
        'main_page_visit': '🏠 Hauptseiten-Besuche',
        'home': '🏠 Hauptseite',
        'login': '🔐 Login',
        'dashboard': '📊 Dashboard',
        'admin_login': '🛡️ Admin Login',
        'admin_dashboard': '🛡️ Admin Dashboard',
        'license_generator': '🔧 Lizenzgenerator',
        'reset_password': '🔑 Passwort Reset'
    };

    return pageNames[page] || page;
}

function showUserManagement() {
    showDataSection('users', 'Benutzer-Verwaltung');
    loadUsers();
}

function showPlayerManagement() {
    showDataSection('players', 'Spieler-Verwaltung');
    loadPlayers();
}

function showRunManagement() {
    showDataSection('runs', 'Läufe-Verwaltung');
    loadRuns();
}

function showLocationManagement() {
    showDataSection('locations', 'Standort-Verwaltung');
    loadLocations();
}

function showAdminUserManagement() {
    showDataSection('adminusers', 'Admin-Benutzer');
    loadAdminUsers();
}

function showSystemInfo() {
    showDataSection('system', 'System-Informationen');
    loadSystemInfo();
}

function showDataSection(type, title) {
    currentDataType = type;
    document.getElementById('dataTitle').textContent = title;
    document.getElementById('dataSection').style.display = 'block';
    document.getElementById('searchInput').value = '';
}

async function loadUsers() {
    // Implementation für Supabase-Benutzer
    document.getElementById('dataContent').innerHTML = '<div class="no-data">Supabase-Benutzer werden über die Supabase-Console verwaltet</div>';
}

async function loadPlayers() {
    try {
        const response = await fetch('/api/v1/admin/players');
        const result = await response.json();

        if (result.success) {
            currentData = result.data;
            displayPlayersTable(result.data);
        } else {
            showError('Fehler beim Laden der Spieler');
        }
    } catch (error) {
        console.error('Failed to load players:', error);
        showError('Fehler beim Laden der Spieler');
    }
}

async function loadRuns() {
    try {
        const response = await fetch('/api/v1/admin/runs');
        const result = await response.json();

        if (result.success) {
            currentData = result.data;
            displayRunsTable(result.data);
        } else {
            showError('Fehler beim Laden der Läufe');
        }
    } catch (error) {
        console.error('Failed to load runs:', error);
        showError('Fehler beim Laden der Läufe');
    }
}

async function loadLocations() {
    try {
        const response = await fetch('/api/v1/admin/locations');
        const result = await response.json();

        if (result.success) {
            currentData = result.data;
            displayLocationsTable(result.data);
        } else {
            showError('Fehler beim Laden der Standorte');
        }
    } catch (error) {
        console.error('Failed to load locations:', error);
        showError('Fehler beim Laden der Standorte');
    }
}

async function loadAdminUsers() {
    try {
        const response = await fetch('/api/v1/admin/adminusers');
        const result = await response.json();

        if (result.success) {
            currentData = result.data;
            displayAdminUsersTable(result.data);
        } else {
            showError('Fehler beim Laden der Admin-Benutzer');
        }
    } catch (error) {
        console.error('Failed to load admin users:', error);
        showError('Fehler beim Laden der Admin-Benutzer');
    }
}

function displayPlayersTable(players) {
    let html = '<div class="table-container"><table class="data-table">';
    html += '<thead><tr><th>ID</th><th>Name</th><th>RFID UID</th><th>Supabase User</th><th>Registriert</th><th>Aktionen</th></tr></thead><tbody>';

    players.forEach(player => {
        html += `<tr>
            <td>${player.id}</td>
            <td>${player.full_name || '-'}</td>
            <td>${player.rfiduid || '-'}</td>
            <td>${player.supabase_user_id ? '✅' : '❌'}</td>
            <td>${new Date(player.created_at).toLocaleDateString('de-DE')}</td>
                                <td class="action-buttons">
                        <button class="btn btn-small btn-warning" onclick="editPlayer('${player.id}')">Bearbeiten</button>
                        <button class="btn btn-small btn-danger" onclick="deletePlayer('${player.id}')">Löschen</button>
                    </td>
        </tr>`;
    });

    html += '</tbody></table></div>';
    document.getElementById('dataContent').innerHTML = html;
}

function displayRunsTable(runs) {
    let html = '<div class="table-container"><table class="data-table">';
    html += '<thead><tr><th>ID</th><th>Spieler</th><th>Standort</th><th>Zeit</th><th>Datum</th><th>Aktionen</th></tr></thead><tbody>';

    runs.forEach(run => {
        // Use the time_seconds value from the backend
        const timeInSeconds = parseFloat(run.time_seconds) || 0;

        html += `<tr>
            <td>${run.id}</td>
            <td>${run.player_name || `Player ${run.player_id}`}</td>
            <td>${run.location_name || `Location ${run.location_id}`}</td>
            <td>${timeInSeconds.toFixed(3)}s</td>
            <td>${new Date(run.created_at).toLocaleDateString('de-DE')} ${new Date(run.created_at).toLocaleTimeString('de-DE')}</td>
                                <td class="action-buttons">
                        <button class="btn btn-small btn-warning" onclick="editRun('${run.id}')">Bearbeiten</button>
                        <button class="btn btn-small btn-danger" onclick="deleteRun('${run.id}')">Löschen</button>
                    </td>
        </tr>`;
    });

    html += '</tbody></table></div>';
    document.getElementById('dataContent').innerHTML = html;
}

function displayLocationsTable(locations) {
    let html = '<div class="table-container"><table class="data-table">';
    html += '<thead><tr><th>ID</th><th>Name</th><th>Latitude</th><th>Longitude</th><th>Mindestzeit (s)</th><th>Erstellt</th><th>Aktionen</th></tr></thead><tbody>';

    locations.forEach(location => {
        html += `<tr>
            <td>${location.id}</td>
            <td>${location.name}</td>
            <td>${location.latitude}</td>
            <td>${location.longitude}</td>
            <td>${location.time_threshold ? (typeof location.time_threshold === 'object' ? location.time_threshold.seconds : location.time_threshold).toFixed(3) : '-'}</td>
            <td>${new Date(location.created_at).toLocaleDateString('de-DE')}</td>
                                <td class="action-buttons">
                        <button class="btn btn-small btn-warning" onclick="editLocation('${location.id}')">Bearbeiten</button>
                        <button class="btn btn-small btn-danger" onclick="deleteLocation('${location.id}')">Löschen</button>
                    </td>
        </tr>`;
    });

    html += '</tbody></table></div>';
    document.getElementById('dataContent').innerHTML = html;
}

function displayAdminUsersTable(users) {
    let html = '<div class="table-container"><table class="data-table">';
    html += '<thead><tr><th>ID</th><th>Benutzername</th><th>Access Level</th><th>Aktiv</th><th>Letzter Login</th><th>Aktionen</th></tr></thead><tbody>';

    users.forEach(user => {
        const isCurrentUser = user.id === currentUser.id;
        html += `<tr>
            <td>${user.id}</td>
            <td>${user.username} ${isCurrentUser ? '(Du)' : ''}</td>
            <td>Level ${user.access_level}</td>
            <td>${user.is_active ? '✅' : '❌'}</td>
            <td>${user.last_login ? new Date(user.last_login).toLocaleDateString('de-DE') : 'Nie'}</td>
            <td class="action-buttons">
                ${!isCurrentUser ? `<button class="btn btn-small btn-danger" onclick="deleteAdminUser(${user.id})">Löschen</button>` : ''}
            </td>
        </tr>`;
    });

    html += '</tbody></table></div>';
    document.getElementById('dataContent').innerHTML = html;
}

function loadSystemInfo() {
    document.getElementById('dataContent').innerHTML = `
        <div style="padding: 20px;">
            <h4>Server-Informationen</h4>
            <p><strong>Node.js Version:</strong> ${navigator.userAgent}</p>
            <p><strong>Aktuelle Zeit:</strong> ${new Date().toLocaleString('de-DE')}</p>
            <p><strong>Angemeldeter Benutzer:</strong> ${currentUser.username} (Level ${currentUser.access_level})</p>
        </div>
    `;
}

function filterData() {
    const searchTerm = document.getElementById('searchInput').value.toLowerCase();
    if (!currentData) return;

    let filteredData = currentData.filter(item => {
        return Object.values(item).some(value =>
            value && value.toString().toLowerCase().includes(searchTerm)
        );
    });

    switch (currentDataType) {
        case 'players':
            displayPlayersTable(filteredData);
            break;
        case 'runs':
            displayRunsTable(filteredData);
            break;
        case 'locations':
            displayLocationsTable(filteredData);
            break;
        case 'adminusers':
            displayAdminUsersTable(filteredData);
            break;
        case 'achievements':
            if (currentAchievementMode === 'achievements') {
                currentAchievements = filteredData;
                displayAchievements();
            } else {
                currentPlayers = filteredData;
                displayPlayers();
            }
            break;
    }
}

function refreshData() {
    switch (currentDataType) {
        case 'players':
            loadPlayers();
            break;
        case 'runs':
            loadRuns();
            break;
        case 'locations':
            loadLocations();
            break;
        case 'adminusers':
            loadAdminUsers();
            break;
        case 'system':
            loadSystemInfo();
            break;
        case 'achievements':
            if (currentAchievementMode === 'achievements') {
                loadAchievements();
            } else {
                loadPlayers();
            }
            break;
    }
}

function showAddModal() {
    const modal = document.getElementById('addModal');
    const modalTitle = document.getElementById('modalTitle');
    const formFields = document.getElementById('formFields');

    // Modal-Titel basierend auf aktuellem Datentyp setzen
    switch (currentDataType) {
        case 'players':
            modalTitle.textContent = 'Neuen Spieler hinzufügen';
            formFields.innerHTML = `
                <div class="form-group">
                    <label for="playerName">Vollständiger Name:</label>
                    <input type="text" id="playerName" name="full_name" required>
                </div>
                <div class="form-group">
                    <label for="playerRfid">RFID UID:</label>
                    <input type="text" id="playerRfid" name="rfiduid" placeholder="z.B. 1234567890">
                </div>
                <div class="form-group">
                    <label for="playerSupabaseId">Supabase User ID (optional):</label>
                    <input type="text" id="playerSupabaseId" name="supabase_user_id" placeholder="UUID">
                </div>
            `;
            break;

        case 'locations':
            modalTitle.textContent = 'Neuen Standort hinzufügen';
            formFields.innerHTML = `
                <div class="form-group">
                    <label for="locationName">Standort-Name:</label>
                    <input type="text" id="locationName" name="name" required>
                </div>
                <div class="form-group">
                    <label for="locationLat">Breitengrad (Latitude):</label>
                    <input type="number" id="locationLat" name="latitude" step="any" required placeholder="z.B. 48.385337">
                </div>
                <div class="form-group">
                    <label for="locationLng">Längengrad (Longitude):</label>
                    <input type="number" id="locationLng" name="longitude" step="any" required placeholder="z.B. 9.986960">
                </div>
                <div class="form-group">
                    <label for="locationThreshold">Zeit-Schwellenwert (optional):</label>
                    <input type="number" id="locationThreshold" name="time_threshold" step="0.001" placeholder="z.B. 60.000">
                </div>
            `;
            break;

        case 'adminusers':
            modalTitle.textContent = 'Neuen Admin-Benutzer hinzufügen';
            formFields.innerHTML = `
                <div class="form-group">
                    <label for="adminUsername">Benutzername:</label>
                    <input type="text" id="adminUsername" name="username" required>
                </div>
                <div class="form-group">
                    <label for="adminPassword">Passwort:</label>
                    <input type="password" id="adminPassword" name="password" required minlength="6">
                </div>
                <div class="form-group">
                    <label for="adminAccessLevel">Zugriffslevel:</label>
                    <select id="adminAccessLevel" name="access_level" required>
                        <option value="1">Level 1 - Basis-Admin</option>
                        <option value="2">Level 2 - Vollzugriff</option>
                    </select>
                </div>
            `;
            break;

        case 'runs':
            modalTitle.textContent = 'Neuen Lauf hinzufügen';
            formFields.innerHTML = `
                <div class="form-group">
                    <label for="runPlayerId">Spieler ID:</label>
                    <input type="number" id="runPlayerId" name="player_id" required>
                </div>
                <div class="form-group">
                    <label for="runLocationId">Standort ID:</label>
                    <input type="number" id="runLocationId" name="location_id" required>
                </div>
                <div class="form-group">
                    <label for="runTime">Zeit (Sekunden):</label>
                    <input type="number" id="runTime" name="time_seconds" step="0.001" required placeholder="z.B. 60.123">
                </div>
            `;
            break;

        default:
            modalTitle.textContent = 'Element hinzufügen';
            formFields.innerHTML = '<p>Keine Felder für diesen Datentyp verfügbar.</p>';
    }

    modal.style.display = 'block';
}

function closeModal() {
    document.querySelectorAll('.modal').forEach(modal => {
        modal.style.display = 'none';
    });
    // Formular zurücksetzen
    document.getElementById('addForm').reset();
    document.getElementById('modalMessage').style.display = 'none';
}

async function handleAddSubmit(e) {
    e.preventDefault();

    const formData = new FormData(e.target);
    const data = Object.fromEntries(formData.entries());

    // Prüfen ob es sich um eine Edit-Operation handelt
    const isEdit = data.edit_id;
    const editId = data.edit_id;
    delete data.edit_id; // edit_id aus den Daten entfernen

    try {
        let endpoint = '';
        let successMessage = '';
        let method = 'POST';

        switch (currentDataType) {
            case 'players':
                endpoint = isEdit ? `/api/v1/admin/players/${editId}` : '/api/v1/admin/players';
                successMessage = isEdit ? 'Spieler erfolgreich aktualisiert' : 'Spieler erfolgreich hinzugefügt';
                method = isEdit ? 'PUT' : 'POST';
                break;
            case 'locations':
                endpoint = isEdit ? `/api/v1/admin/locations/${editId}` : '/api/v1/admin/locations';
                successMessage = isEdit ? 'Standort erfolgreich aktualisiert' : 'Standort erfolgreich hinzugefügt';
                method = isEdit ? 'PUT' : 'POST';
                break;
            case 'adminusers':
                endpoint = isEdit ? `/api/v1/admin/adminusers/${editId}` : '/api/v1/admin/adminusers';
                successMessage = isEdit ? 'Admin-Benutzer erfolgreich aktualisiert' : 'Admin-Benutzer erfolgreich hinzugefügt';
                method = isEdit ? 'PUT' : 'POST';
                break;
            case 'runs':
                endpoint = isEdit ? `/api/v1/admin/runs/${editId}` : '/api/v1/admin/runs';
                successMessage = isEdit ? 'Lauf erfolgreich aktualisiert' : 'Lauf erfolgreich hinzugefügt';
                method = isEdit ? 'PUT' : 'POST';
                break;
            case 'achievements':
                // Handle achievement form submission
                await handleAchievementSubmit(formData);
                return;
            default:
                showError('Unbekannter Datentyp');
                return;
        }

        const response = await fetch(endpoint, {
            method: method,
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(data)
        });

        const result = await response.json();

        if (result.success) {
            showSuccess(successMessage);
            closeModal();
            refreshData(); // Daten neu laden
        } else {
            showError(result.message || `Fehler beim ${isEdit ? 'Aktualisieren' : 'Hinzufügen'}`);
        }

    } catch (error) {
        console.error('Submit failed:', error);
        showError(`Fehler beim ${isEdit ? 'Aktualisieren' : 'Hinzufügen'}`);
    }
}

// Edit-Funktionen
async function editPlayer(id) {
    const player = currentData.find(p => p.id == id);
    if (!player) return;

    const modal = document.getElementById('addModal');
    const modalTitle = document.getElementById('modalTitle');
    const formFields = document.getElementById('formFields');

    modalTitle.textContent = 'Spieler bearbeiten';
    formFields.innerHTML = `
        <div class="form-group">
            <label for="playerName">Vollständiger Name:</label>
            <input type="text" id="playerName" name="full_name" value="${player.full_name || ''}" required>
        </div>
        <div class="form-group">
            <label for="playerRfid">RFID UID:</label>
            <input type="text" id="playerRfid" name="rfiduid" value="${player.rfiduid || ''}" placeholder="z.B. 1234567890">
        </div>
        <div class="form-group">
            <label for="playerSupabaseId">Supabase User ID (optional):</label>
            <input type="text" id="playerSupabaseId" name="supabase_user_id" value="${player.supabase_user_id || ''}" placeholder="UUID">
        </div>
        <input type="hidden" name="edit_id" value="${player.id}">
    `;

    modal.style.display = 'block';
}

async function editLocation(id) {
    const location = currentData.find(l => l.id == id);
    if (!location) return;

    const modal = document.getElementById('addModal');
    const modalTitle = document.getElementById('modalTitle');
    const formFields = document.getElementById('formFields');

    modalTitle.textContent = 'Standort bearbeiten';
    formFields.innerHTML = `
        <div class="form-group">
            <label for="locationName">Standort-Name:</label>
            <input type="text" id="locationName" name="name" value="${location.name}" required>
        </div>
        <div class="form-group">
            <label for="locationLat">Breitengrad (Latitude):</label>
            <input type="number" id="locationLat" name="latitude" step="any" value="${location.latitude}" required placeholder="z.B. 48.385337">
        </div>
        <div class="form-group">
            <label for="locationLng">Längengrad (Longitude):</label>
            <input type="number" id="locationLng" name="longitude" step="any" value="${location.longitude}" required placeholder="z.B. 9.986960">
        </div>
        <div class="form-group">
            <label for="locationThreshold">Zeit-Schwellenwert (optional):</label>
            <input type="number" id="locationThreshold" name="time_threshold" step="0.001" value="${location.time_threshold || ''}" placeholder="z.B. 60.000">
        </div>
        <input type="hidden" name="edit_id" value="${location.id}">
    `;

    modal.style.display = 'block';
}

async function editRun(id) {
    try {
        // Lade die spezifischen Lauf-Daten direkt von der API
        const response = await fetch(`/api/admin-runs/${id}`);
        const result = await response.json();

        if (!result.success) {
            showError('Fehler beim Laden der Lauf-Daten: ' + (result.message || 'Unbekannter Fehler'));
            return;
        }

        const run = result.data;
        if (!run) {
            showError('Lauf nicht gefunden');
            return;
        }

        console.log('Editing run:', run); // Debug log

        const modal = document.getElementById('addModal');
        const modalTitle = document.getElementById('modalTitle');
        const formFields = document.getElementById('formFields');

        modalTitle.textContent = 'Lauf bearbeiten';
        formFields.innerHTML = `
            <div class="form-group">
                <label for="runPlayerId">Spieler ID:</label>
                <input type="text" id="runPlayerId" name="player_id" value="${run.player_id || ''}" required>
            </div>
            <div class="form-group">
                <label for="runLocationId">Standort ID:</label>
                <input type="text" id="runLocationId" name="location_id" value="${run.location_id || ''}" required>
            </div>
            <div class="form-group">
                <label for="runTime">Zeit (Sekunden):</label>
                <input type="number" id="runTime" name="time_seconds" step="0.001" value="${parseFloat(run.time_seconds || 0)}" required placeholder="z.B. 60.123">
            </div>
            <input type="hidden" name="edit_id" value="${run.id}">
        `;

        modal.style.display = 'block';

    } catch (error) {
        console.error('Error loading run data:', error);
        showError('Fehler beim Laden der Lauf-Daten');
    }
}

async function deletePlayer(id) {
    if (await confirmDelete(`Spieler mit ID ${id} löschen?`)) {
        try {
            const response = await fetch(`/api/v1/admin/players/${id}`, { method: 'DELETE' });
            const result = await response.json();

            if (result.success) {
                showSuccess('Spieler erfolgreich gelöscht');
                loadPlayers();
            } else {
                showError('Fehler beim Löschen des Spielers');
            }
        } catch (error) {
            console.error('Delete failed:', error);
            showError('Fehler beim Löschen des Spielers');
        }
    }
}

async function deleteRun(id) {
    if (await confirmDelete(`Lauf mit ID ${id} löschen?`)) {
        try {
            const response = await fetch(`/api/v1/admin/runs/${id}`, { method: 'DELETE' });
            const result = await response.json();

            if (result.success) {
                showSuccess('Lauf erfolgreich gelöscht');
                loadRuns();
            } else {
                showError('Fehler beim Löschen des Laufs');
            }
        } catch (error) {
            console.error('Delete failed:', error);
            showError('Fehler beim Löschen des Laufs');
        }
    }
}

async function deleteLocation(id) {
    if (await confirmDelete(`Standort mit ID ${id} löschen?`)) {
        try {
            const response = await fetch(`/api/v1/admin/locations/${id}`, { method: 'DELETE' });
            const result = await response.json();

            if (result.success) {
                showSuccess('Standort erfolgreich gelöscht');
                loadLocations();
            } else {
                showError('Fehler beim Löschen des Standorts');
            }
        } catch (error) {
            console.error('Delete failed:', error);
            showError('Fehler beim Löschen des Standorts');
        }
    }
}

async function deleteAdminUser(id) {
    if (await confirmDelete(`Admin-Benutzer mit ID ${id} löschen?`)) {
        try {
            const response = await fetch(`/api/v1/admin/adminusers/${id}`, { method: 'DELETE' });
            const result = await response.json();

            if (result.success) {
                showSuccess('Admin-Benutzer erfolgreich gelöscht');
                loadAdminUsers();
            } else {
                showError('Fehler beim Löschen des Admin-Benutzers');
            }
        } catch (error) {
            console.error('Delete failed:', error);
            showError('Fehler beim Löschen des Admin-Benutzers');
        }
    }
}

function confirmDelete(message) {
    return new Promise((resolve) => {
        document.getElementById('confirmMessage').textContent = message;
        document.getElementById('confirmModal').style.display = 'block';

        document.getElementById('confirmYes').onclick = () => {
            closeModal();
            resolve(true);
        };

        document.getElementById('confirmNo').onclick = () => {
            closeModal();
            resolve(false);
        };
    });
}

function showSuccess(message) {
    const messageDiv = document.getElementById('modalMessage');
    messageDiv.textContent = message;
    messageDiv.className = 'message success';
    messageDiv.style.display = 'block';
    setTimeout(() => {
        messageDiv.style.display = 'none';
    }, 3000);
}

function showError(message) {
    const messageDiv = document.getElementById('modalMessage');
    messageDiv.textContent = message;
    messageDiv.className = 'message error';
    messageDiv.style.display = 'block';
    setTimeout(() => {
        messageDiv.style.display = 'none';
    }, 3000);
}

// ============================================================================
// BLACKLIST MANAGEMENT FUNCTIONS
// ============================================================================

async function showBlacklistManagement() {
    currentDataType = 'blacklist';
    document.getElementById('blacklistModal').style.display = 'block';
    await loadBlacklist();
    await loadBlacklistStats();
}

async function loadBlacklist() {
    try {
        const response = await fetch('/api/v1/admin/blacklist');
        const result = await response.json();

        if (result.success) {
            displayBlacklist(result.data);
        } else {
            showBlacklistMessage('Fehler beim Laden der Blacklist: ' + result.message, 'error');
        }
    } catch (error) {
        console.error('Error loading blacklist:', error);
        showBlacklistMessage('Fehler beim Laden der Blacklist', 'error');
    }
}

function displayBlacklist(blacklist) {
    const content = document.getElementById('blacklistContent');

    let html = '<h3 style="color: #ffffff; margin-bottom: 1rem;">📋 Blacklist-Inhalte</h3>';

    Object.entries(blacklist).forEach(([category, terms]) => {
        const categoryName = getCategoryDisplayName(category);
        const categoryIcon = getCategoryIcon(category);

        html += `
            <div style="border: 1px solid #334155; padding: 1rem; margin-bottom: 1rem; border-radius: 8px; background: rgba(15, 23, 42, 0.3);">
                <h4 style="color: #ffffff; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem;">
                    ${categoryIcon} ${categoryName} 
                    <span style="background: #1e293b; color: #8892b0; padding: 0.25rem 0.5rem; border-radius: 12px; font-size: 0.8rem;">
                        ${terms.length} Einträge
                    </span>
                </h4>
                <div style="display: flex; flex-wrap: wrap; gap: 0.5rem;">
        `;

        if (terms.length === 0) {
            html += `
                <div style="color: #64748b; font-style: italic; padding: 1rem; text-align: center; width: 100%;">
                    Keine Einträge in dieser Kategorie
                </div>
            `;
        } else {
            terms.forEach(term => {
                html += `
                    <span style="background: #1e293b; color: #e2e8f0; padding: 0.375rem 0.75rem; border-radius: 6px; display: flex; align-items: center; gap: 0.5rem; border: 1px solid #334155;">
                        <span style="font-family: monospace; font-size: 0.9rem;">${term}</span>
                        <button onclick="removeFromBlacklist('${term}', '${category}')" 
                                style="background: #dc2626; color: white; border: none; border-radius: 50%; width: 20px; height: 20px; cursor: pointer; font-size: 12px; display: flex; align-items: center; justify-content: center; transition: background-color 0.2s;"
                                onmouseover="this.style.backgroundColor='#b91c1c'" 
                                onmouseout="this.style.backgroundColor='#dc2626'"
                                title="Entfernen">
                            ×
                        </button>
                    </span>
                `;
            });
        }

        html += `
                </div>
            </div>
        `;
    });

    content.innerHTML = html;
}

// Kategorie-Icons hinzufügen
function getCategoryIcon(category) {
    const icons = {
        historical: '🏛️',
        offensive: '⚠️',
        titles: '👑',
        brands: '🏷️',
        inappropriate: '🚫',
        racial: '🌍',
        religious: '⛪',
        disability: '♿',
        leetspeak: '🔤',
        cyberbullying: '💻',
        drugs: '💊',
        violence: '⚔️'
    };
    return icons[category] || '📝';
}

function getCategoryDisplayName(category) {
    const names = {
        historical: 'Historisch belastet',
        offensive: 'Beleidigend/anstößig',
        titles: 'Titel/Berufsbezeichnung',
        brands: 'Markenname',
        inappropriate: 'Unpassend',
        racial: 'Rassistisch/ethnisch',
        religious: 'Religiös beleidigend',
        disability: 'Behinderungsbezogen',
        leetspeak: 'Verschleiert',
        cyberbullying: 'Cyberbullying',
        drugs: 'Drogenbezogen',
        violence: 'Gewalt/Bedrohung'
    };
    return names[category] || category;
}

async function testNameAgainstBlacklist() {
    const firstname = document.getElementById('testFirstname').value.trim();
    const lastname = document.getElementById('testLastname').value.trim();
    const resultDiv = document.getElementById('testResult');

    if (!firstname || !lastname) {
        showBlacklistMessage('Bitte gib Vorname und Nachname ein', 'error');
        return;
    }

    try {
        const response = await fetch('/api/v1/admin/blacklist/test', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ firstname, lastname })
        });

        const result = await response.json();

        if (result.success) {
            const testResult = result.data;

            if (testResult.isBlocked) {
                let matchTypeText = '';
                let similarityText = '';

                if (testResult.matchType === 'exact') {
                    matchTypeText = 'Exakte Übereinstimmung';
                } else if (testResult.matchType === 'similar') {
                    matchTypeText = 'Ähnliche Übereinstimmung (Levenshtein)';
                    const similarityPercent = Math.round((1 - testResult.similarity) * 100);
                    similarityText = `<br>Ähnlichkeit: ${similarityPercent}% (Distanz: ${testResult.levenshteinDistance})`;
                }

                resultDiv.innerHTML = `
                    <div style="background: #ffebee; color: #c62828; padding: 0.5rem; border-radius: 3px;">
                        <strong>❌ Name ist blockiert</strong><br>
                        Grund: ${testResult.reason}<br>
                        Kategorie: ${getCategoryDisplayName(testResult.category)}<br>
                        Gefundener Begriff: "${testResult.matchedTerm}"<br>
                        Typ: ${matchTypeText}${similarityText}
                    </div>
                `;
            } else {
                resultDiv.innerHTML = `
                    <div style="background: #e8f5e8; color: #2e7d32; padding: 0.5rem; border-radius: 3px;">
                        <strong>✅ Name ist erlaubt</strong><br>
                        Der Name "${firstname} ${lastname}" ist nicht in der Blacklist.
                    </div>
                `;
            }

            resultDiv.style.display = 'block';
        } else {
            showBlacklistMessage('Fehler beim Testen: ' + result.message, 'error');
        }
    } catch (error) {
        console.error('Error testing name:', error);
        showBlacklistMessage('Fehler beim Testen des Namens', 'error');
    }
}

// Detailed Levenshtein test function
async function testLevenshteinDetailed() {
    const firstname = document.getElementById('testFirstname').value.trim();
    const lastname = document.getElementById('testLastname').value.trim();
    const resultDiv = document.getElementById('testResult');

    if (!firstname || !lastname) {
        showBlacklistMessage('Bitte gib Vorname und Nachname ein', 'error');
        return;
    }

    try {
        const response = await fetch('/api/v1/admin/blacklist/levenshtein-test', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ firstname, lastname, threshold: 0.3 })
        });

        const result = await response.json();

        if (result.success) {
            const data = result.data;
            let html = `
                <div style="background: #f3e5f5; color: #4a148c; padding: 1rem; border-radius: 5px; margin-top: 1rem;">
                    <h4>🔍 Detaillierte Levenshtein-Analyse</h4>
                    <p><strong>Getesteter Name:</strong> ${data.input.firstname} ${data.input.lastname}</p>
                    <p><strong>Schwellenwert:</strong> ${data.threshold}</p>
                    <hr style="margin: 1rem 0;">
            `;

            // Show results for each category
            for (const [category, categoryResult] of Object.entries(data.results)) {
                if (categoryResult.hasSimilarTerms && categoryResult.similarTerms.length > 0) {
                    html += `
                        <div style="margin-bottom: 1rem; padding: 0.5rem; background: #fff3e0; border-left: 4px solid #ff9800; border-radius: 3px;">
                            <h5>📁 ${getCategoryDisplayName(category)} (Schwellenwert: ${categoryResult.categoryThreshold})</h5>
                    `;
                    
                    categoryResult.similarTerms.forEach(term => {
                        const similarityPercent = Math.round((1 - term.distance) * 100);
                        html += `
                            <div style="margin: 0.5rem 0; padding: 0.5rem; background: white; border-radius: 3px;">
                                <strong>Begriff:</strong> "${term.term}"<br>
                                <strong>Levenshtein-Distanz:</strong> ${term.levenshteinDistance}<br>
                                <strong>Normalisierte Distanz:</strong> ${term.distance.toFixed(4)}<br>
                                <strong>Ähnlichkeit:</strong> ${similarityPercent}%<br>
                                <strong>Match-Typ:</strong> ${term.matchType || 'similar'}
                            </div>
                        `;
                    });
                    
                    html += `</div>`;
                }
            }

            // If no matches found
            if (!Object.values(data.results).some(r => r.hasSimilarTerms)) {
                html += `
                    <div style="background: #e8f5e8; color: #2e7d32; padding: 1rem; border-radius: 3px;">
                        <strong>✅ Keine ähnlichen Begriffe gefunden</strong><br>
                        Der Name "${data.input.firstname} ${data.input.lastname}" hat keine ähnlichen Begriffe in der Blacklist.
                    </div>
                `;
            }

            html += `</div>`;
            resultDiv.innerHTML = html;
            resultDiv.style.display = 'block';
        } else {
            showBlacklistMessage(result.message || 'Fehler beim Testen', 'error');
        }
    } catch (error) {
        console.error('Error testing Levenshtein:', error);
        showBlacklistMessage('Fehler beim Testen der Levenshtein-Distanz', 'error');
    }
}

async function addToBlacklist() {
    const term = document.getElementById('newTerm').value.trim();
    const category = document.getElementById('newCategory').value;

    if (!term) {
        showBlacklistMessage('Bitte gib einen Begriff ein', 'error');
        return;
    }

    try {
        const response = await fetch('/api/v1/admin/blacklist', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ term, category })
        });

        const result = await response.json();

        if (result.success) {
            showBlacklistMessage('Begriff erfolgreich hinzugefügt', 'success');
            document.getElementById('newTerm').value = '';
            await loadBlacklist();
            await loadBlacklistStats();
        } else {
            showBlacklistMessage('Fehler beim Hinzufügen: ' + result.message, 'error');
        }
    } catch (error) {
        console.error('Error adding to blacklist:', error);
        showBlacklistMessage('Fehler beim Hinzufügen zur Blacklist', 'error');
    }
}

async function removeFromBlacklist(term, category) {
    if (!confirm(`Möchtest du "${term}" aus der Kategorie "${getCategoryDisplayName(category)}" entfernen?`)) {
        return;
    }

    try {
        const response = await fetch('/api/v1/admin/blacklist', {
            method: 'DELETE',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ term, category })
        });

        const result = await response.json();

        if (result.success) {
            showBlacklistMessage('Begriff erfolgreich entfernt', 'success');
            await loadBlacklist();
            await loadBlacklistStats();
        } else {
            showBlacklistMessage('Fehler beim Entfernen: ' + result.message, 'error');
        }
    } catch (error) {
        console.error('Error removing from blacklist:', error);
        showBlacklistMessage('Fehler beim Entfernen aus der Blacklist', 'error');
    }
}

function showBlacklistMessage(message, type) {
    const messageDiv = document.getElementById('blacklistMessage');
    messageDiv.textContent = message;
    messageDiv.className = `message ${type}`;
    messageDiv.style.display = 'block';
    setTimeout(() => {
        messageDiv.style.display = 'none';
    }, 3000);
}

// Blacklist-Statistiken laden
async function loadBlacklistStats() {
    try {
        const response = await fetch('/api/v1/admin/blacklist/stats');
        const result = await response.json();

        if (result.success) {
            displayBlacklistStats(result.data);
        } else {
            console.error('Error loading blacklist stats:', result.message);
        }
    } catch (error) {
        console.error('Error loading blacklist stats:', error);
    }
}

// Blacklist-Statistiken anzeigen
function displayBlacklistStats(stats) {
    // Erstelle oder aktualisiere Statistiken-Bereich
    let statsDiv = document.getElementById('blacklistStats');
    if (!statsDiv) {
        // Erstelle Statistiken-Bereich am Anfang des Modals
        const modalContent = document.querySelector('#blacklistModal .modal-content');
        const firstChild = modalContent.firstChild;
        statsDiv = document.createElement('div');
        statsDiv.id = 'blacklistStats';
        statsDiv.style.cssText = 'border: 1px solid #4ade80; padding: 1rem; margin-bottom: 1rem; border-radius: 5px; background: rgba(34, 197, 94, 0.1);';
        modalContent.insertBefore(statsDiv, firstChild);
    }

    let html = `
        <h4 style="color: #4ade80; margin-bottom: 1rem;">📊 Blacklist-Statistiken</h4>
        <div style="display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; margin-bottom: 1rem;">
    `;

    stats.categories.forEach(category => {
        const categoryName = getCategoryDisplayName(category.category);
        const lastAdded = new Date(category.last_added).toLocaleDateString('de-DE');
        html += `
            <div style="background: rgba(15, 23, 42, 0.5); padding: 0.75rem; border-radius: 5px; text-align: center;">
                <div style="font-size: 1.5rem; font-weight: bold; color: #4ade80;">${category.count}</div>
                <div style="font-size: 0.9rem; color: #8892b0;">${categoryName}</div>
                <div style="font-size: 0.8rem; color: #64748b;">Letzte: ${lastAdded}</div>
            </div>
        `;
    });

    html += `
        </div>
        <div style="text-align: center; padding: 0.5rem; background: rgba(15, 23, 42, 0.3); border-radius: 5px;">
            <strong style="color: #4ade80;">Gesamt: ${stats.total} Begriffe</strong>
        </div>
    `;

    statsDiv.innerHTML = html;
}

// ==================== ACHIEVEMENT MANAGEMENT ====================

let currentAchievementMode = 'achievements'; // 'achievements' or 'players'
let currentAchievements = [];
let currentPlayers = [];

// Show achievement management
async function showAchievementManagement() {
    currentDataType = 'achievements';
    currentAchievementMode = 'achievements';
    
    document.getElementById('dataTitle').textContent = '🏆 Achievement-Verwaltung';
    document.getElementById('dataSection').style.display = 'block';
    
    // Update search placeholder
    document.getElementById('searchInput').placeholder = 'Achievements durchsuchen...';
    
    await loadAchievements();
}

// Load all achievements
async function loadAchievements() {
    try {
        const response = await fetch('/api/v1/admin/achievements');
        const result = await response.json();
        
        if (result.success) {
            currentAchievements = result.data;
            currentData = result.data; // Set for filtering
            displayAchievements();
        } else {
            showError('Fehler beim Laden der Achievements: ' + result.message);
        }
    } catch (error) {
        console.error('Error loading achievements:', error);
        showError('Fehler beim Laden der Achievements');
    }
}

// Display achievements in table
function displayAchievements() {
    const content = document.getElementById('dataContent');
    
    if (currentAchievements.length === 0) {
        content.innerHTML = '<div class="no-data">Keine Achievements gefunden</div>';
        return;
    }
    
    let html = `
        <div class="achievement-controls">
            <button class="btn btn-success" onclick="showAddAchievementModal()">➕ Neues Achievement</button>
            <button class="btn" onclick="toggleAchievementMode()">👥 Spieler-Ansicht</button>
        </div>
        <div class="table-container">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Status</th>
                        <th>Icon</th>
                        <th>Name</th>
                        <th>Kategorie</th>
                        <th>Bedingung</th>
                        <th>Punkte</th>
                        <th>Mehrmals</th>
                        <th>Aktionen</th>
                    </tr>
                </thead>
                <tbody>
    `;
    
    currentAchievements.forEach(achievement => {
        const statusClass = achievement.is_active ? 'active' : 'inactive';
        const statusText = achievement.is_active ? 'Aktiv' : 'Inaktiv';
        const multipleText = achievement.can_be_earned_multiple_times ? 'Ja' : 'Nein';
        
        html += `
            <tr>
                <td><span class="status-badge ${statusClass}">${statusText}</span></td>
                <td>${achievement.icon || '🏆'}</td>
                <td>
                    <strong>${achievement.name}</strong>
                    ${achievement.name_en ? `<br><small>${achievement.name_en}</small>` : ''}
                </td>
                <td>${achievement.category}</td>
                <td>${achievement.condition_type}: ${achievement.condition_value}</td>
                <td>${achievement.points}</td>
                <td>${multipleText}</td>
                <td>
                    <button class="btn btn-sm" onclick="editAchievement('${achievement.id}')">✏️</button>
                    <button class="btn btn-sm btn-danger" onclick="deleteAchievement('${achievement.id}', '${achievement.name}')">🗑️</button>
                </td>
            </tr>
        `;
    });
    
    html += `
                </tbody>
            </table>
        </div>
    `;
    
    content.innerHTML = html;
}

// Handle achievement form submission
async function handleAchievementSubmit(formData) {
    const isEdit = formData.has('achievement_id');
    const url = isEdit ? 
        `/api/v1/admin/achievements/${formData.get('achievement_id')}` : 
        '/api/v1/admin/achievements';
    const method = isEdit ? 'PUT' : 'POST';
    
    const data = {
        name: formData.get('name'),
        name_en: formData.get('name_en') || null,
        description: formData.get('description'),
        description_en: formData.get('description_en') || null,
        category: formData.get('category'),
        condition_type: formData.get('condition_type'),
        condition_value: parseInt(formData.get('condition_value')),
        icon: formData.get('icon') || '🏆',
        points: parseInt(formData.get('points')) || 10,
        is_active: formData.has('is_active'),
        can_be_earned_multiple_times: formData.has('can_be_earned_multiple_times')
    };
    
    try {
        const response = await fetch(url, {
            method: method,
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        });
        const result = await response.json();
        
        if (result.success) {
            showSuccess(result.message);
            closeModal();
            await loadAchievements();
        } else {
            showError('Fehler beim Speichern: ' + result.message);
        }
    } catch (error) {
        console.error('Error saving achievement:', error);
        showError('Fehler beim Speichern des Achievements');
    }
}

// Toggle between achievements and players view
async function toggleAchievementMode() {
    if (currentAchievementMode === 'achievements') {
        currentAchievementMode = 'players';
        document.getElementById('dataTitle').textContent = '👥 Spieler-Achievements';
        document.getElementById('searchInput').placeholder = 'Spieler durchsuchen...';
        await loadPlayers();
    } else {
        currentAchievementMode = 'achievements';
        document.getElementById('dataTitle').textContent = '🏆 Achievement-Verwaltung';
        document.getElementById('searchInput').placeholder = 'Achievements durchsuchen...';
        await loadAchievements();
    }
}

// Load all players with achievement statistics
async function loadPlayers() {
    try {
        const response = await fetch('/api/v1/admin/achievements/players');
        const result = await response.json();
        
        if (result.success) {
            currentPlayers = result.data;
            currentData = result.data; // Set for filtering
            displayPlayers();
        } else {
            showError('Fehler beim Laden der Spieler: ' + result.message);
        }
    } catch (error) {
        console.error('Error loading players:', error);
        showError('Fehler beim Laden der Spieler');
    }
}

// Display players in table
function displayPlayers() {
    const content = document.getElementById('dataContent');
    
    if (currentPlayers.length === 0) {
        content.innerHTML = '<div class="no-data">Keine Spieler gefunden</div>';
        return;
    }
    
    let html = `
        <div class="achievement-controls">
            <button class="btn" onclick="toggleAchievementMode()">🏆 Achievement-Ansicht</button>
        </div>
        <div class="table-container">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Spieler</th>
                        <th>Abgeschlossen</th>
                        <th>Gesamt</th>
                        <th>Fortschritt</th>
                        <th>Punkte</th>
                        <th>Aktionen</th>
                    </tr>
                </thead>
                <tbody>
    `;
    
    currentPlayers.forEach(player => {
        const progressPercentage = player.completion_percentage || 0;
        const progressBar = `
            <div class="progress-bar">
                <div class="progress-fill" style="width: ${progressPercentage}%"></div>
                <span class="progress-text">${progressPercentage}%</span>
            </div>
        `;
        
        html += `
            <tr>
                <td><strong>${player.firstname} ${player.lastname}</strong></td>
                <td>${player.completed_achievements}</td>
                <td>${player.total_achievements}</td>
                <td>${progressBar}</td>
                <td>${player.total_points}</td>
                <td>
                    <button class="btn btn-sm" onclick="viewPlayerAchievements('${player.id}', '${player.firstname} ${player.lastname}')">👁️</button>
                </td>
            </tr>
        `;
    });
    
    html += `
                </tbody>
            </table>
        </div>
    `;
    
    content.innerHTML = html;
}

// Show add achievement modal
function showAddAchievementModal() {
    const modal = document.getElementById('addModal');
    const modalTitle = document.getElementById('modalTitle');
    const formFields = document.getElementById('formFields');
    
    modalTitle.textContent = 'Neues Achievement erstellen';
    
    formFields.innerHTML = `
        <div class="form-group">
            <label for="achievement_name">Name *</label>
            <input type="text" id="achievement_name" name="name" required>
        </div>
        <div class="form-group">
            <label for="achievement_name_en">Name (Englisch)</label>
            <input type="text" id="achievement_name_en" name="name_en">
        </div>
        <div class="form-group">
            <label for="achievement_description">Beschreibung *</label>
            <textarea id="achievement_description" name="description" required></textarea>
        </div>
        <div class="form-group">
            <label for="achievement_description_en">Beschreibung (Englisch)</label>
            <textarea id="achievement_description_en" name="description_en"></textarea>
        </div>
        <div class="form-group">
            <label for="achievement_category">Kategorie *</label>
            <select id="achievement_category" name="category" required>
                <option value="">Kategorie wählen</option>
                <option value="consistency">Konsistenz</option>
                <option value="improvement">Verbesserung</option>
                <option value="seasonal">Saisonal</option>
                <option value="monthly">Monatlich</option>
                <option value="best_time">Beste Zeit</option>
            </select>
        </div>
        <div class="form-group">
            <label for="achievement_condition_type">Bedingungstyp *</label>
            <input type="text" id="achievement_condition_type" name="condition_type" required placeholder="z.B. first_time, attempts_per_day">
        </div>
        <div class="form-group">
            <label for="achievement_condition_value">Bedingungswert *</label>
            <input type="number" id="achievement_condition_value" name="condition_value" required>
        </div>
        <div class="form-group">
            <label for="achievement_icon">Icon</label>
            <input type="text" id="achievement_icon" name="icon" value="🏆">
        </div>
        <div class="form-group">
            <label for="achievement_points">Punkte</label>
            <input type="number" id="achievement_points" name="points" value="10">
        </div>
        <div class="form-group">
            <label>
                <input type="checkbox" id="achievement_is_active" name="is_active" checked>
                Aktiv
            </label>
        </div>
        <div class="form-group">
            <label>
                <input type="checkbox" id="achievement_multiple" name="can_be_earned_multiple_times">
                Kann mehrmals erreicht werden
            </label>
        </div>
    `;
    
    modal.style.display = 'block';
}

// Edit achievement
async function editAchievement(achievementId) {
    const achievement = currentAchievements.find(a => a.id === achievementId);
    if (!achievement) return;
    
    const modal = document.getElementById('addModal');
    const modalTitle = document.getElementById('modalTitle');
    const formFields = document.getElementById('formFields');
    
    modalTitle.textContent = 'Achievement bearbeiten';
    
    formFields.innerHTML = `
        <input type="hidden" id="achievement_id" value="${achievement.id}">
        <div class="form-group">
            <label for="achievement_name">Name *</label>
            <input type="text" id="achievement_name" name="name" value="${achievement.name}" required>
        </div>
        <div class="form-group">
            <label for="achievement_name_en">Name (Englisch)</label>
            <input type="text" id="achievement_name_en" name="name_en" value="${achievement.name_en || ''}">
        </div>
        <div class="form-group">
            <label for="achievement_description">Beschreibung *</label>
            <textarea id="achievement_description" name="description" required>${achievement.description}</textarea>
        </div>
        <div class="form-group">
            <label for="achievement_description_en">Beschreibung (Englisch)</label>
            <textarea id="achievement_description_en" name="description_en">${achievement.description_en || ''}</textarea>
        </div>
        <div class="form-group">
            <label for="achievement_category">Kategorie *</label>
            <select id="achievement_category" name="category" required>
                <option value="consistency" ${achievement.category === 'consistency' ? 'selected' : ''}>Konsistenz</option>
                <option value="improvement" ${achievement.category === 'improvement' ? 'selected' : ''}>Verbesserung</option>
                <option value="seasonal" ${achievement.category === 'seasonal' ? 'selected' : ''}>Saisonal</option>
                <option value="monthly" ${achievement.category === 'monthly' ? 'selected' : ''}>Monatlich</option>
                <option value="best_time" ${achievement.category === 'best_time' ? 'selected' : ''}>Beste Zeit</option>
            </select>
        </div>
        <div class="form-group">
            <label for="achievement_condition_type">Bedingungstyp *</label>
            <input type="text" id="achievement_condition_type" name="condition_type" value="${achievement.condition_type}" required>
        </div>
        <div class="form-group">
            <label for="achievement_condition_value">Bedingungswert *</label>
            <input type="number" id="achievement_condition_value" name="condition_value" value="${achievement.condition_value}" required>
        </div>
        <div class="form-group">
            <label for="achievement_icon">Icon</label>
            <input type="text" id="achievement_icon" name="icon" value="${achievement.icon || '🏆'}">
        </div>
        <div class="form-group">
            <label for="achievement_points">Punkte</label>
            <input type="number" id="achievement_points" name="points" value="${achievement.points}">
        </div>
        <div class="form-group">
            <label>
                <input type="checkbox" id="achievement_is_active" name="is_active" ${achievement.is_active ? 'checked' : ''}>
                Aktiv
            </label>
        </div>
        <div class="form-group">
            <label>
                <input type="checkbox" id="achievement_multiple" name="can_be_earned_multiple_times" ${achievement.can_be_earned_multiple_times ? 'checked' : ''}>
                Kann mehrmals erreicht werden
            </label>
        </div>
    `;
    
    modal.style.display = 'block';
}

// Delete achievement
function deleteAchievement(achievementId, achievementName) {
    document.getElementById('confirmMessage').textContent = `Möchten Sie das Achievement "${achievementName}" wirklich deaktivieren?`;
    document.getElementById('confirmYes').onclick = () => confirmDeleteAchievement(achievementId);
    document.getElementById('confirmModal').style.display = 'block';
}

// Confirm delete achievement
async function confirmDeleteAchievement(achievementId) {
    try {
        const response = await fetch(`/api/v1/admin/achievements/${achievementId}`, {
            method: 'DELETE'
        });
        const result = await response.json();
        
        if (result.success) {
            showSuccess(result.message);
            closeModal();
            await loadAchievements();
        } else {
            showError('Fehler beim Löschen: ' + result.message);
        }
    } catch (error) {
        console.error('Error deleting achievement:', error);
        showError('Fehler beim Löschen des Achievements');
    }
}

// View player achievements
async function viewPlayerAchievements(playerId, playerName) {
    try {
        const response = await fetch(`/api/v1/admin/achievements/players/${playerId}`);
        const result = await response.json();
        
        if (result.success) {
            showPlayerAchievementsModal(result.player, result.data);
        } else {
            showError('Fehler beim Laden der Spieler-Achievements: ' + result.message);
        }
    } catch (error) {
        console.error('Error loading player achievements:', error);
        showError('Fehler beim Laden der Spieler-Achievements');
    }
}

// Show player achievements modal
function showPlayerAchievementsModal(player, achievements) {
    const modal = document.getElementById('addModal');
    const modalTitle = document.getElementById('modalTitle');
    const formFields = document.getElementById('formFields');
    
    modalTitle.textContent = `Achievements von ${player.firstname} ${player.lastname}`;
    
    let html = `
        <div class="player-achievements">
            <div class="achievement-stats">
                <div class="stat-item">
                    <strong>Abgeschlossen:</strong> ${achievements.filter(a => a.is_completed).length} / ${achievements.length}
                </div>
                <div class="stat-item">
                    <strong>Gesamtpunkte:</strong> ${achievements.filter(a => a.is_completed).reduce((sum, a) => sum + a.points, 0)}
                </div>
            </div>
            <div class="achievements-list">
    `;
    
    achievements.forEach(achievement => {
        const statusClass = achievement.is_completed ? 'completed' : 'not-completed';
        const statusIcon = achievement.is_completed ? '✅' : '❌';
        const completionCount = achievement.completion_count || 0;
        
        html += `
            <div class="achievement-item ${statusClass}">
                <div class="achievement-header">
                    <span class="achievement-icon">${achievement.icon}</span>
                    <span class="achievement-name">${achievement.name}</span>
                    <span class="achievement-status">${statusIcon}</span>
                </div>
                <div class="achievement-details">
                    <p>${achievement.description}</p>
                    <div class="achievement-meta">
                        <span>Kategorie: ${achievement.category}</span>
                        <span>Punkte: ${achievement.points}</span>
                        ${achievement.is_completed ? `<span>Erreicht: ${new Date(achievement.earned_at).toLocaleDateString('de-DE')}</span>` : ''}
                        ${completionCount > 1 ? `<span>Anzahl: ${completionCount}</span>` : ''}
                    </div>
                    <div class="achievement-actions">
                        ${!achievement.is_completed ? 
                            `<button class="btn btn-sm btn-success" onclick="awardAchievement('${player.id}', '${achievement.id}', '${achievement.name}')">Vergeben</button>` :
                            `<button class="btn btn-sm btn-danger" onclick="revokeAchievement('${player.id}', '${achievement.id}', '${achievement.name}')">Entfernen</button>`
                        }
                    </div>
                </div>
            </div>
        `;
    });
    
    html += `
            </div>
        </div>
    `;
    
    formFields.innerHTML = html;
    modal.style.display = 'block';
}

// Award achievement to player
async function awardAchievement(playerId, achievementId, achievementName) {
    try {
        const response = await fetch(`/api/v1/admin/achievements/players/${playerId}/award`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                achievement_id: achievementId,
                progress: 1
            })
        });
        const result = await response.json();
        
        if (result.success) {
            showSuccess(result.message);
            // Refresh player achievements
            await viewPlayerAchievements(playerId, '');
        } else {
            showError('Fehler beim Vergeben: ' + result.message);
        }
    } catch (error) {
        console.error('Error awarding achievement:', error);
        showError('Fehler beim Vergeben des Achievements');
    }
}

// Revoke achievement from player
async function revokeAchievement(playerId, achievementId, achievementName) {
    if (!confirm(`Möchten Sie das Achievement "${achievementName}" wirklich entfernen?`)) {
        return;
    }
    
    try {
        const response = await fetch(`/api/v1/admin/achievements/players/${playerId}/revoke`, {
            method: 'DELETE',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                achievement_id: achievementId
            })
        });
        const result = await response.json();
        
        if (result.success) {
            showSuccess(result.message);
            // Refresh player achievements
            await viewPlayerAchievements(playerId, '');
        } else {
            showError('Fehler beim Entfernen: ' + result.message);
        }
    } catch (error) {
        console.error('Error revoking achievement:', error);
        showError('Fehler beim Entfernen des Achievements');
    }
}