// Admin panel JavaScript
let adminMap = null;
let startMarker = null;

// Initialize when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    checkAdminAuth();
    initializeAdminMap();
    loadCurrentStartLocation();
    setupEventListeners();
});

// Check if user is authenticated as admin
async function checkAdminAuth() {
    try {
        const response = await fetch('/api/auth/check');
        const data = await response.json();
        
        if (!data.authenticated || !data.user?.isAdmin) {
            window.location.href = '/login.html';
            return;
        }
        
        // Display admin info
        document.getElementById('admin-info').innerHTML = `
            <span>👤 ${escapeHtml(data.user.email)}</span>
            <button id="logout-btn" class="btn btn-secondary btn-sm">Logout</button>
        `;
        
        document.getElementById('logout-btn').addEventListener('click', handleLogout);
        
    } catch (error) {
        console.error('Auth check failed:', error);
        window.location.href = '/login.html';
    }
}

// Initialize the admin map
function initializeAdminMap() {
    adminMap = L.map('admin-map').setView([53.5461, -113.4938], 11);
    
    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
        attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
        maxZoom: 19,
        minZoom: 2
    }).addTo(adminMap);
    
    // Add click handler to set location
    adminMap.on('click', handleMapClick);
    
    // Update coordinates when map moves
    adminMap.on('moveend', updateCoordinatesFromMap);
}

// Load current start location
async function loadCurrentStartLocation() {
    try {
        const response = await fetch('/api/admin/start-location');
        const data = await response.json();
        
        if (data.success) {
            const { latitude, longitude, zoom } = data.location;
            
            // Update form fields
            document.getElementById('start-lat').value = latitude;
            document.getElementById('start-lng').value = longitude;
            document.getElementById('start-zoom').value = zoom;
            
            // Update map
            adminMap.setView([latitude, longitude], zoom);
            updateStartMarker(latitude, longitude);
            
            // Show source info
            if (data.source) {
                const sourceText = data.source === 'database' ? 'Loaded from database' :
                                 data.source === 'environment' ? 'Using environment defaults' :
                                 'Using system defaults';
                showStatus(sourceText, 'info');
            }
        }
        
    } catch (error) {
        console.error('Failed to load start location:', error);
        showStatus('Failed to load current start location', 'error');
    }
}

// Handle map click
function handleMapClick(e) {
    const { lat, lng } = e.latlng;
    
    document.getElementById('start-lat').value = lat.toFixed(6);
    document.getElementById('start-lng').value = lng.toFixed(6);
    
    updateStartMarker(lat, lng);
}

// Update marker position
function updateStartMarker(lat, lng) {
    if (startMarker) {
        startMarker.setLatLng([lat, lng]);
    } else {
        startMarker = L.marker([lat, lng], {
            draggable: true,
            title: 'Start Location'
        }).addTo(adminMap);
        
        // Update coordinates when marker is dragged
        startMarker.on('dragend', (e) => {
            const position = e.target.getLatLng();
            document.getElementById('start-lat').value = position.lat.toFixed(6);
            document.getElementById('start-lng').value = position.lng.toFixed(6);
        });
    }
}

// Update coordinates from current map view
function updateCoordinatesFromMap() {
    const center = adminMap.getCenter();
    const zoom = adminMap.getZoom();
    
    document.getElementById('start-zoom').value = zoom;
}

// Setup event listeners
function setupEventListeners() {
    // Use current view button
    document.getElementById('use-current-view').addEventListener('click', () => {
        const center = adminMap.getCenter();
        const zoom = adminMap.getZoom();
        
        document.getElementById('start-lat').value = center.lat.toFixed(6);
        document.getElementById('start-lng').value = center.lng.toFixed(6);
        document.getElementById('start-zoom').value = zoom;
        
        updateStartMarker(center.lat, center.lng);
        showStatus('Captured current map view', 'success');
    });
    
    // Save button
    document.getElementById('save-start-location').addEventListener('click', saveStartLocation);
    
    // Coordinate input changes
    document.getElementById('start-lat').addEventListener('change', updateMapFromInputs);
    document.getElementById('start-lng').addEventListener('change', updateMapFromInputs);
    document.getElementById('start-zoom').addEventListener('change', updateMapFromInputs);
}

// Update map from input fields
function updateMapFromInputs() {
    const lat = parseFloat(document.getElementById('start-lat').value);
    const lng = parseFloat(document.getElementById('start-lng').value);
    const zoom = parseInt(document.getElementById('start-zoom').value);
    
    if (!isNaN(lat) && !isNaN(lng) && !isNaN(zoom)) {
        adminMap.setView([lat, lng], zoom);
        updateStartMarker(lat, lng);
    }
}

// Save start location
async function saveStartLocation() {
    const lat = parseFloat(document.getElementById('start-lat').value);
    const lng = parseFloat(document.getElementById('start-lng').value);
    const zoom = parseInt(document.getElementById('start-zoom').value);
    
    // Validate
    if (isNaN(lat) || isNaN(lng) || isNaN(zoom)) {
        showStatus('Please enter valid coordinates and zoom level', 'error');
        return;
    }
    
    if (lat < -90 || lat > 90 || lng < -180 || lng > 180) {
        showStatus('Coordinates out of valid range', 'error');
        return;
    }
    
    if (zoom < 2 || zoom > 19) {
        showStatus('Zoom level must be between 2 and 19', 'error');
        return;
    }
    
    try {
        const response = await fetch('/api/admin/start-location', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                latitude: lat,
                longitude: lng,
                zoom: zoom
            })
        });
        
        const data = await response.json();
        
        if (data.success) {
            showStatus('Start location saved successfully!', 'success');
        } else {
            throw new Error(data.error || 'Failed to save');
        }
        
    } catch (error) {
        console.error('Save error:', error);
        showStatus(error.message || 'Failed to save start location', 'error');
    }
}

// Handle logout
async function handleLogout() {
    if (!confirm('Are you sure you want to logout?')) {
        return;
    }
    
    try {
        const response = await fetch('/api/auth/logout', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            }
        });
        
        if (response.ok) {
            window.location.href = '/login.html';
        } else {
            showStatus('Logout failed. Please try again.', 'error');
        }
    } catch (error) {
        console.error('Logout error:', error);
        showStatus('Logout failed. Please try again.', 'error');
    }
}

// Show status message
function showStatus(message, type = 'info') {
    const container = document.getElementById('status-container');
    
    const messageDiv = document.createElement('div');
    messageDiv.className = `status-message ${type}`;
    messageDiv.textContent = message;
    
    container.appendChild(messageDiv);
    
    // Auto-remove after 5 seconds
    setTimeout(() => {
        messageDiv.remove();
    }, 5000);
}

// Escape HTML
function escapeHtml(text) {
    if (text === null || text === undefined) {
        return '';
    }
    const div = document.createElement('div');
    div.textContent = String(text);
    return div.innerHTML;
}