ant_quic/monitoring/

dashboards.rs

//! Dashboard Management System
//!
//! This module implements dashboard generation and management for NAT traversal
//! monitoring data with real-time visualizations and interactive analytics.

use std::{
    collections::HashMap,
    sync::Arc,
    time::{Duration, SystemTime},
};

use tokio::sync::{RwLock, Mutex};
use tracing::{debug, info, warn};
use serde::{Serialize, Deserialize};

use crate::monitoring::MonitoringError;

/// Dashboard manager for visualization and analytics
pub struct DashboardManager {
    /// Dashboard configuration
    config: DashboardConfig,
    /// Widget registry
    widget_registry: Arc<WidgetRegistry>,
    /// Data providers
    data_providers: Arc<RwLock<HashMap<String, DataProviderImpl>>>,
    /// Template engine
    template_engine: Arc<TemplateEngine>,
    /// Real-time updater
    realtime_updater: Arc<RealtimeUpdater>,
    /// Dashboard state
    state: Arc<RwLock<DashboardState>>,
    /// Background tasks
    tasks: Arc<Mutex<Vec<tokio::task::JoinHandle<()>>>>,
}

impl DashboardManager {
    /// Create new dashboard manager
    pub async fn new(config: DashboardConfig) -> Result<Self, MonitoringError> {
        let widget_registry = Arc::new(WidgetRegistry::new());
        let data_providers = Arc::new(RwLock::new(HashMap::new()));
        let template_engine = Arc::new(TemplateEngine::new());
        let realtime_updater = Arc::new(RealtimeUpdater::new());
        let state = Arc::new(RwLock::new(DashboardState::new()));

        let manager = Self {
            config,
            widget_registry,
            data_providers,
            template_engine,
            realtime_updater,
            state,
            tasks: Arc::new(Mutex::new(Vec::new())),
        };

        // Register default widgets and data providers
        manager.register_default_components().await?;

        Ok(manager)
    }

    /// Start dashboard manager
    pub async fn start(&self) -> Result<(), MonitoringError> {
        info!("Starting dashboard manager");

        // Start background tasks
        self.start_dashboard_update_task().await?;
        self.start_data_refresh_task().await?;
        self.start_health_monitoring_task().await?;

        // Generate initial dashboards
        self.generate_all_dashboards().await?;

        // Update state
        {
            let mut state = self.state.write().await;
            state.status = DashboardStatus::Running;
            state.start_time = Some(SystemTime::now());
        }

        info!("Dashboard manager started");
        Ok(())
    }

    /// Stop dashboard manager
    pub async fn stop(&self) -> Result<(), MonitoringError> {
        info!("Stopping dashboard manager");

        // Update state
        {
            let mut state = self.state.write().await;
            state.status = DashboardStatus::Stopping;
        }

        // Stop background tasks
        let mut tasks = self.tasks.lock().await;
        for task in tasks.drain(..) {
            task.abort();
        }

        // Update state
        {
            let mut state = self.state.write().await;
            state.status = DashboardStatus::Stopped;
            state.stop_time = Some(SystemTime::now());
        }

        info!("Dashboard manager stopped");
        Ok(())
    }

    /// Get dashboard manager status
    pub async fn get_status(&self) -> String {
        let state = self.state.read().await;
        format!("{:?}", state.status)
    }

    /// Generate specific dashboard
    pub async fn generate_dashboard(&self, dashboard_id: &str) -> Result<Dashboard, MonitoringError> {
        let config = self.config.dashboards.iter()
            .find(|d| d.id == dashboard_id)
            .ok_or_else(|| MonitoringError::ConfigError(format!("Dashboard {} not found", dashboard_id)))?;

        self.build_dashboard(config).await
    }

    /// Get all available dashboards
    pub async fn get_dashboards(&self) -> Vec<DashboardInfo> {
        self.config.dashboards.iter()
            .map(|d| DashboardInfo {
                id: d.id.clone(),
                title: d.title.clone(),
                description: d.description.clone(),
                category: d.category.clone(),
                last_updated: SystemTime::now(), // Would track actual update time
            })
            .collect()
    }

    /// Update dashboard data
    pub async fn update_dashboard_data(&self, data: DashboardData) -> Result<(), MonitoringError> {
        self.realtime_updater.push_update(data).await;
        Ok(())
    }

    /// Register default components
    async fn register_default_components(&self) -> Result<(), MonitoringError> {
        // Register default widgets
        self.widget_registry.register_widget("time_series", WidgetBuilderImpl::TimeSeries(TimeSeriesWidget::new())).await;
        self.widget_registry.register_widget("gauge", WidgetBuilderImpl::Gauge(GaugeWidget::new())).await;
        self.widget_registry.register_widget("heatmap", WidgetBuilderImpl::Heatmap(HeatmapWidget::new())).await;
        self.widget_registry.register_widget("table", WidgetBuilderImpl::Table(TableWidget::new())).await;

        // Register default data providers
        let mut providers = self.data_providers.write().await;
        providers.insert("nat_attempts".to_string(), DataProviderImpl::NatAttempts(NatAttemptsDataProvider::new()));
        providers.insert("nat_results".to_string(), DataProviderImpl::NatResults(NatResultsDataProvider::new()));
        providers.insert("health".to_string(), DataProviderImpl::Health(HealthDataProvider::new()));

        info!("Registered default dashboard components");
        Ok(())
    }

    /// Generate all configured dashboards
    async fn generate_all_dashboards(&self) -> Result<(), MonitoringError> {
        for dashboard_config in &self.config.dashboards {
            if let Err(e) = self.build_dashboard(dashboard_config).await {
                warn!("Failed to generate dashboard {}: {}", dashboard_config.id, e);
            }
        }
        Ok(())
    }

    /// Build individual dashboard
    async fn build_dashboard(&self, config: &DashboardDefinition) -> Result<Dashboard, MonitoringError> {
        let mut widgets = Vec::new();

        for widget_config in &config.widgets {
            let widget = self.build_widget(widget_config).await?;
            widgets.push(widget);
        }

        Ok(Dashboard {
            id: config.id.clone(),
            title: config.title.clone(),
            description: config.description.clone(),
            category: config.category.clone(),
            layout: config.layout.clone(),
            widgets,
            generated_at: SystemTime::now(),
            auto_refresh: config.auto_refresh,
        })
    }

    /// Build individual widget
    async fn build_widget(&self, config: &WidgetDefinition) -> Result<Widget, MonitoringError> {
        // Get widget builder
        let widget_builder = self.widget_registry.get_widget(&config.widget_type).await
            .ok_or_else(|| MonitoringError::ConfigError(format!("Unknown widget type: {}", config.widget_type)))?;

        // Get data provider
        let data_providers = self.data_providers.read().await;
        let data_provider = data_providers.get(&config.data_source)
            .ok_or_else(|| MonitoringError::ConfigError(format!("Unknown data source: {}", config.data_source)))?;

        // Fetch data
        let data = data_provider.fetch_data(&config.query).await?;

        // Build widget
        let widget_data = widget_builder.build(&data, &config.options).await?;

        Ok(Widget {
            id: config.id.clone(),
            title: config.title.clone(),
            widget_type: config.widget_type.clone(),
            position: config.position.clone(),
            size: config.size.clone(),
            data: widget_data,
            config: config.options.clone(),
        })
    }

    /// Start dashboard update task
    async fn start_dashboard_update_task(&self) -> Result<(), MonitoringError> {
        let config = self.config.clone();
        let _widget_registry = self.widget_registry.clone();
        let _data_providers = self.data_providers.clone();

        let task = tokio::spawn(async move {
            let mut interval = tokio::time::interval(config.update_interval);

            loop {
                interval.tick().await;

                // Update dashboard data
                debug!("Updating dashboard data");
            }
        });

        self.tasks.lock().await.push(task);
        Ok(())
    }

    /// Start data refresh task
    async fn start_data_refresh_task(&self) -> Result<(), MonitoringError> {
        let data_providers = self.data_providers.clone();
        let refresh_interval = self.config.data_refresh_interval;

        let task = tokio::spawn(async move {
            let mut interval = tokio::time::interval(refresh_interval);

            loop {
                interval.tick().await;

                // Refresh data providers
                let providers = data_providers.read().await;
                for provider in providers.values() {
                    if let Err(e) = provider.refresh().await {
                        warn!("Failed to refresh data provider: {}", e);
                    }
                }
            }
        });

        self.tasks.lock().await.push(task);
        Ok(())
    }

    /// Start health monitoring task
    async fn start_health_monitoring_task(&self) -> Result<(), MonitoringError> {
        let state = self.state.clone();

        let task = tokio::spawn(async move {
            let mut interval = tokio::time::interval(Duration::from_secs(30));

            loop {
                interval.tick().await;

                let mut dashboard_state = state.write().await;
                dashboard_state.last_health_check = Some(SystemTime::now());
                dashboard_state.dashboards_generated += 1; // Would track actual generation count
            }
        });

        self.tasks.lock().await.push(task);
        Ok(())
    }
}

/// Dashboard configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DashboardConfig {
    /// Dashboard definitions
    pub dashboards: Vec<DashboardDefinition>,
    /// Update interval for real-time dashboards
    pub update_interval: Duration,
    /// Data refresh interval
    pub data_refresh_interval: Duration,
    /// Enable real-time updates
    pub realtime_enabled: bool,
    /// Authentication settings
    pub auth: DashboardAuthConfig,
    /// Export settings
    pub export: DashboardExportConfig,
}

impl Default for DashboardConfig {
    fn default() -> Self {
        Self {
            dashboards: vec![
                DashboardDefinition {
                    id: "nat-overview".to_string(),
                    title: "NAT Traversal Overview".to_string(),
                    description: "High-level overview of NAT traversal performance".to_string(),
                    category: "Overview".to_string(),
                    layout: LayoutType::Grid { columns: 2, rows: 3 },
                    auto_refresh: true,
                    widgets: vec![
                        WidgetDefinition {
                            id: "success-rate".to_string(),
                            title: "Success Rate".to_string(),
                            widget_type: "gauge".to_string(),
                            data_source: "metrics".to_string(),
                            query: "success_rate_last_hour".to_string(),
                            position: Position { x: 0, y: 0 },
                            size: Size { width: 1, height: 1 },
                            options: HashMap::new(),
                        },
                        WidgetDefinition {
                            id: "attempts-timeline".to_string(),
                            title: "Attempts Over Time".to_string(),
                            widget_type: "time_series".to_string(),
                            data_source: "metrics".to_string(),
                            query: "attempts_timeline".to_string(),
                            position: Position { x: 1, y: 0 },
                            size: Size { width: 1, height: 2 },
                            options: HashMap::new(),
                        },
                    ],
                }
            ],
            update_interval: Duration::from_secs(30),
            data_refresh_interval: Duration::from_secs(60),
            realtime_enabled: true,
            auth: DashboardAuthConfig::default(),
            export: DashboardExportConfig::default(),
        }
    }
}

/// Dashboard definition
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DashboardDefinition {
    /// Unique dashboard identifier
    pub id: String,
    /// Dashboard title
    pub title: String,
    /// Dashboard description
    pub description: String,
    /// Dashboard category
    pub category: String,
    /// Layout configuration
    pub layout: LayoutType,
    /// Auto-refresh enabled
    pub auto_refresh: bool,
    /// Widget definitions
    pub widgets: Vec<WidgetDefinition>,
}

/// Widget definition
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WidgetDefinition {
    /// Unique widget identifier
    pub id: String,
    /// Widget title
    pub title: String,
    /// Widget type
    pub widget_type: String,
    /// Data source
    pub data_source: String,
    /// Data query
    pub query: String,
    /// Widget position
    pub position: Position,
    /// Widget size
    pub size: Size,
    /// Widget options
    pub options: HashMap<String, serde_json::Value>,
}

/// Layout types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum LayoutType {
    Grid { columns: u32, rows: u32 },
    Flexible,
    Fixed,
}

/// Widget position
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Position {
    pub x: u32,
    pub y: u32,
}

/// Widget size
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Size {
    pub width: u32,
    pub height: u32,
}

/// Dashboard authentication configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DashboardAuthConfig {
    /// Enable authentication
    pub enabled: bool,
    /// Authentication provider
    pub provider: String,
    /// Access control rules
    pub access_rules: Vec<AccessRule>,
}

impl Default for DashboardAuthConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            provider: "oauth2".to_string(),
            access_rules: vec![
                AccessRule {
                    role: "admin".to_string(),
                    permissions: vec!["read".to_string(), "write".to_string()],
                    dashboards: vec!["*".to_string()],
                }
            ],
        }
    }
}

/// Access rule for dashboard permissions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AccessRule {
    /// User role
    pub role: String,
    /// Permissions
    pub permissions: Vec<String>,
    /// Accessible dashboards
    pub dashboards: Vec<String>,
}

/// Dashboard export configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DashboardExportConfig {
    /// Enable export functionality
    pub enabled: bool,
    /// Supported export formats
    pub formats: Vec<ExportFormat>,
    /// Export storage location
    pub storage_path: String,
}

impl Default for DashboardExportConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            formats: vec![ExportFormat::PNG, ExportFormat::PDF, ExportFormat::JSON],
            storage_path: "/tmp/dashboard-exports".to_string(),
        }
    }
}

/// Export formats
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ExportFormat {
    PNG,
    PDF,
    SVG,
    JSON,
    CSV,
}

/// Generated dashboard
#[derive(Debug, Serialize, Deserialize)]
pub struct Dashboard {
    /// Dashboard identifier
    pub id: String,
    /// Dashboard title
    pub title: String,
    /// Dashboard description
    pub description: String,
    /// Dashboard category
    pub category: String,
    /// Layout configuration
    pub layout: LayoutType,
    /// Widgets
    pub widgets: Vec<Widget>,
    /// Generation timestamp
    pub generated_at: SystemTime,
    /// Auto-refresh enabled
    pub auto_refresh: bool,
}

/// Dashboard widget
#[derive(Debug, Serialize, Deserialize)]
pub struct Widget {
    /// Widget identifier
    pub id: String,
    /// Widget title
    pub title: String,
    /// Widget type
    pub widget_type: String,
    /// Widget position
    pub position: Position,
    /// Widget size
    pub size: Size,
    /// Widget data
    pub data: WidgetData,
    /// Widget configuration
    pub config: HashMap<String, serde_json::Value>,
}

/// Widget data
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WidgetData {
    /// Data points
    pub data_points: Vec<DataPoint>,
    /// Metadata
    pub metadata: HashMap<String, serde_json::Value>,
    /// Last update timestamp
    pub last_updated: SystemTime,
}

/// Data point for widgets
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DataPoint {
    /// Timestamp
    pub timestamp: SystemTime,
    /// Value
    pub value: serde_json::Value,
    /// Labels
    pub labels: HashMap<String, String>,
}

/// Dashboard information
#[derive(Debug, Serialize, Deserialize)]
pub struct DashboardInfo {
    /// Dashboard identifier
    pub id: String,
    /// Dashboard title
    pub title: String,
    /// Dashboard description
    pub description: String,
    /// Dashboard category
    pub category: String,
    /// Last update timestamp
    pub last_updated: SystemTime,
}

/// Dashboard data for real-time updates
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DashboardData {
    /// Data source identifier
    pub source: String,
    /// Data payload
    pub data: serde_json::Value,
    /// Timestamp
    pub timestamp: SystemTime,
}

/// Widget registry for managing widget types
struct WidgetRegistry {
    widgets: RwLock<HashMap<String, WidgetBuilderImpl>>,
}

impl WidgetRegistry {
    /// Create a new widget registry
    fn new() -> Self {
        Self {
            widgets: RwLock::new(HashMap::new()),
        }
    }

    /// Register a widget builder for a widget type
    async fn register_widget(&self, widget_type: &str, builder: WidgetBuilderImpl) {
        let mut widgets = self.widgets.write().await;
        widgets.insert(widget_type.to_string(), builder);
    }

    /// Get a widget builder by type
    async fn get_widget(&self, widget_type: &str) -> Option<WidgetBuilderImpl> {
        let widgets = self.widgets.read().await;
        widgets.get(widget_type).cloned()
    }
}

/// Enum for concrete data provider implementations
#[derive(Clone)]
pub enum DataProviderImpl {
    NatAttempts(NatAttemptsDataProvider),
    NatResults(NatResultsDataProvider),
    Health(HealthDataProvider),
}

impl DataProviderImpl {
    /// Fetch data based on the query string
    pub async fn fetch_data(&self, query: &str) -> Result<WidgetData, MonitoringError> {
        match self {
            DataProviderImpl::NatAttempts(provider) => provider.fetch_data(query).await,
            DataProviderImpl::NatResults(provider) => provider.fetch_data(query).await,
            DataProviderImpl::Health(provider) => provider.fetch_data(query).await,
        }
    }
    
    /// Refresh the data provider's internal state
    pub async fn refresh(&self) -> Result<(), MonitoringError> {
        match self {
            DataProviderImpl::NatAttempts(provider) => provider.refresh().await,
            DataProviderImpl::NatResults(provider) => provider.refresh().await,
            DataProviderImpl::Health(provider) => provider.refresh().await,
        }
    }
}

/// Enum for concrete widget builder implementations
#[derive(Clone)]
pub enum WidgetBuilderImpl {
    TimeSeries(TimeSeriesWidget),
    Gauge(GaugeWidget),
    Heatmap(HeatmapWidget),
    Table(TableWidget),
}

impl WidgetBuilderImpl {
    /// Build widget visualization from data and options
    pub async fn build(&self, data: &WidgetData, options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError> {
        match self {
            WidgetBuilderImpl::TimeSeries(widget) => widget.build(data, options).await,
            WidgetBuilderImpl::Gauge(widget) => widget.build(data, options).await,
            WidgetBuilderImpl::Heatmap(widget) => widget.build(data, options).await,
            WidgetBuilderImpl::Table(widget) => widget.build(data, options).await,
        }
    }
}

/// Widget builder trait
trait WidgetBuilder {
    async fn build(&self, data: &WidgetData, options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError>;
}

/// Data provider trait
trait DataProvider {
    async fn fetch_data(&self, query: &str) -> Result<WidgetData, MonitoringError>;
    async fn refresh(&self) -> Result<(), MonitoringError>;
}

/// Template engine for dashboard rendering
struct TemplateEngine;

impl TemplateEngine {
    /// Create a new template engine
    fn new() -> Self {
        Self
    }

    /// Render dashboard to string representation
    async fn render_dashboard(&self, dashboard: &Dashboard) -> Result<String, MonitoringError> {
        // Would implement template rendering
        Ok(format!("Dashboard: {}", dashboard.title))
    }
}

/// Real-time updater for live dashboards
struct RealtimeUpdater {
    updates: Mutex<Vec<DashboardData>>,
}

impl RealtimeUpdater {
    /// Create a new real-time updater
    fn new() -> Self {
        Self {
            updates: Mutex::new(Vec::new()),
        }
    }

    /// Push a real-time update
    async fn push_update(&self, data: DashboardData) {
        let mut updates = self.updates.lock().await;
        updates.push(data);
    }
}

/// Dashboard manager state
#[derive(Debug)]
struct DashboardState {
    status: DashboardStatus,
    start_time: Option<SystemTime>,
    stop_time: Option<SystemTime>,
    dashboards_generated: u64,
    last_health_check: Option<SystemTime>,
}

impl DashboardState {
    /// Create a new dashboard state
    fn new() -> Self {
        Self {
            status: DashboardStatus::Stopped,
            start_time: None,
            stop_time: None,
            dashboards_generated: 0,
            last_health_check: None,
        }
    }
}

/// Dashboard manager status
#[derive(Debug, Clone)]
enum DashboardStatus {
    Stopped,
    Starting,
    Running,
    Stopping,
    Error,
}

// Widget implementations

/// Time series widget builder
#[derive(Clone)]
pub struct TimeSeriesWidget;

impl TimeSeriesWidget {
    /// Create a new time series widget
    fn new() -> Self {
        Self
    }
}

impl WidgetBuilder for TimeSeriesWidget {
    async fn build(&self, data: &WidgetData, _options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError> {
        // Transform data for time series visualization
        Ok(data.clone())
    }
}

/// Counter widget builder
#[derive(Clone)]
struct CounterWidget;

impl CounterWidget {
    /// Create a new counter widget
    fn new() -> Self {
        Self
    }
}

impl WidgetBuilder for CounterWidget {
    async fn build(&self, data: &WidgetData, _options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError> {
        // Transform data for counter display
        Ok(data.clone())
    }
}

/// Gauge widget builder
#[derive(Clone)]
pub struct GaugeWidget;

impl GaugeWidget {
    /// Create a new gauge widget
    fn new() -> Self {
        Self
    }
}

impl WidgetBuilder for GaugeWidget {
    async fn build(&self, data: &WidgetData, _options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError> {
        // Transform data for gauge visualization
        Ok(data.clone())
    }
}

/// Heatmap widget builder
#[derive(Clone)]
pub struct HeatmapWidget;

impl HeatmapWidget {
    /// Create a new heatmap widget
    fn new() -> Self {
        Self
    }
}

impl WidgetBuilder for HeatmapWidget {
    async fn build(&self, data: &WidgetData, _options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError> {
        // Transform data for heatmap visualization
        Ok(data.clone())
    }
}

/// Table widget builder
#[derive(Clone)]
pub struct TableWidget;

impl TableWidget {
    /// Create a new table widget
    fn new() -> Self {
        Self
    }
}

impl WidgetBuilder for TableWidget {
    async fn build(&self, data: &WidgetData, _options: &HashMap<String, serde_json::Value>) -> Result<WidgetData, MonitoringError> {
        // Transform data for table display
        Ok(data.clone())
    }
}

// Data provider implementations

/// Metrics data provider
#[derive(Clone)]
pub struct NatAttemptsDataProvider;

impl NatAttemptsDataProvider {
    /// Create a new NAT attempts data provider
    fn new() -> Self {
        Self
    }
}

impl DataProvider for NatAttemptsDataProvider {
    async fn fetch_data(&self, _query: &str) -> Result<WidgetData, MonitoringError> {
        // Fetch NAT attempts data
        Ok(WidgetData {
            data_points: Vec::new(),
            metadata: HashMap::new(),
            last_updated: SystemTime::now(),
        })
    }

    async fn refresh(&self) -> Result<(), MonitoringError> {
        debug!("Refreshing NAT attempts data provider");
        Ok(())
    }
}

/// NAT results data provider
#[derive(Clone)]
pub struct NatResultsDataProvider;

impl NatResultsDataProvider {
    /// Create a new NAT results data provider
    fn new() -> Self {
        Self
    }
}

impl DataProvider for NatResultsDataProvider {
    async fn fetch_data(&self, _query: &str) -> Result<WidgetData, MonitoringError> {
        // Fetch NAT results data
        Ok(WidgetData {
            data_points: Vec::new(),
            metadata: HashMap::new(),
            last_updated: SystemTime::now(),
        })
    }

    async fn refresh(&self) -> Result<(), MonitoringError> {
        debug!("Refreshing NAT results data provider");
        Ok(())
    }
}

/// Health data provider
#[derive(Clone)]
pub struct HealthDataProvider;

impl HealthDataProvider {
    /// Create a new health data provider
    fn new() -> Self {
        Self
    }
}

impl DataProvider for HealthDataProvider {
    async fn fetch_data(&self, _query: &str) -> Result<WidgetData, MonitoringError> {
        // Fetch health data
        Ok(WidgetData {
            data_points: Vec::new(),
            metadata: HashMap::new(),
            last_updated: SystemTime::now(),
        })
    }

    async fn refresh(&self) -> Result<(), MonitoringError> {
        debug!("Refreshing health data provider");
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_dashboard_manager_creation() {
        let config = DashboardConfig::default();
        let manager = DashboardManager::new(config).await.unwrap();
        
        let status = manager.get_status().await;
        assert!(status.contains("Stopped"));
    }

    #[tokio::test]
    async fn test_dashboard_generation() {
        let config = DashboardConfig::default();
        let manager = DashboardManager::new(config).await.unwrap();
        
        let dashboards = manager.get_dashboards().await;
        assert!(!dashboards.is_empty());
        assert_eq!(dashboards[0].id, "nat-overview");
    }

    #[test]
    fn test_widget_data_serialization() {
        let widget_data = WidgetData {
            data_points: vec![
                DataPoint {
                    timestamp: SystemTime::now(),
                    value: serde_json::json!(42),
                    labels: HashMap::new(),
                }
            ],
            metadata: HashMap::new(),
            last_updated: SystemTime::now(),
        };

        let json = serde_json::to_string(&widget_data).unwrap();
        let _deserialized: WidgetData = serde_json::from_str(&json).unwrap();
    }
}