//! Real-time Monitoring Module
//!
//! This module provides comprehensive real-time monitoring capabilities for CUDA memory optimization,
//! including system state tracking, performance monitoring, alerting, dashboards, and advanced
//! observability features for production environments.

use std::collections::{HashMap, VecDeque};
use std::sync::{Arc, RwLock};
use std::thread;
use std::time::{Duration, Instant};

// ============================================================================
// Stub implementations for missing types
// ============================================================================

/// Machine learning change detectors (stub implementation)
#[derive(Debug)]
struct MLChangeDetectors {}

impl MLChangeDetectors {
    fn new() -> Self {
        Self {}
    }

    fn start(&mut self) -> Result<(), MonitoringError> {
        Ok(())
    }

    fn stop(&mut self) -> Result<(), MonitoringError> {
        Ok(())
    }
}

/// Threshold adapter (stub implementation)
#[derive(Debug)]
struct ThresholdAdapter {}

impl ThresholdAdapter {
    fn new() -> Self {
        Self {}
    }
}

/// Change classifier (stub implementation)
#[derive(Debug)]
struct ChangeClassifier {}

impl ChangeClassifier {
    fn new() -> Self {
        Self {}
    }
}

/// False positive reducer (stub implementation)
#[derive(Debug)]
struct FalsePositiveReducer {}

impl FalsePositiveReducer {
    fn new() -> Self {
        Self {}
    }
}

/// Change impact assessor (stub implementation)
#[derive(Debug)]
struct ChangeImpactAssessor {}

impl ChangeImpactAssessor {
    fn new() -> Self {
        Self {}
    }
}

/// Change classification type (stub implementation)
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum ChangeClassification {
    Unclassified,
}

/// Change impact type (stub implementation)
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum ChangeImpact {
    Unknown,
}

/// Log analyzer (stub implementation)
#[derive(Debug)]
struct LogAnalyzer {}

impl LogAnalyzer {
    fn new(_config: LogConfig) -> Self {
        Self {}
    }
}

/// Anomaly detection system (stub implementation)
#[derive(Debug)]
struct AnomalyDetectionSystem {}

impl AnomalyDetectionSystem {
    fn new(_config: AnomalyConfig) -> Self {
        Self {}
    }
}

/// Health check system (stub implementation)
#[derive(Debug)]
struct HealthCheckSystem {}

impl HealthCheckSystem {
    fn new(_config: HealthConfig) -> Self {
        Self {}
    }
}

/// Resource usage tracker (stub implementation)
#[derive(Debug)]
pub struct ResourceUsageTracker {}

impl ResourceUsageTracker {
    fn new(_config: ResourceConfig) -> Self {
        Self {}
    }
}

/// Event correlation engine (stub implementation)
#[derive(Debug)]
struct EventCorrelationEngine {}

impl EventCorrelationEngine {
    fn new(_config: CorrelationConfig) -> Self {
        Self {}
    }
}

/// Distributed tracing system (stub implementation)
#[derive(Debug)]
struct DistributedTracingSystem {}

impl DistributedTracingSystem {
    fn new(_config: TracingConfig) -> Self {
        Self {}
    }
}

/// Monitoring export data (stub implementation)
#[derive(Debug)]
struct MonitoringExportData {}

impl MonitoringExportData {
    fn new() -> Self {
        Self {}
    }
}

/// State validator (stub implementation)
#[derive(Debug)]
struct StateValidator {}

impl StateValidator {
    fn new() -> Self {
        Self {}
    }
}

/// State aggregation engine (stub implementation)
#[derive(Debug)]
struct StateAggregationEngine {}

impl StateAggregationEngine {
    fn new() -> Self {
        Self {}
    }
}

/// State comparison system (stub implementation)
#[derive(Debug)]
struct StateComparisonSystem {}

impl StateComparisonSystem {
    fn new() -> Self {
        Self {}
    }
}

/// State export system (stub implementation)
#[derive(Debug)]
struct StateExportSystem {}

impl StateExportSystem {
    fn new() -> Self {
        Self {}
    }
}

/// System import result (stub implementation)
#[derive(Debug)]
struct SystemImportResult {}

impl SystemImportResult {
    fn new() -> Self {
        Self {}
    }
}

/// Statistical change models (stub implementation)
#[derive(Debug)]
struct StatisticalChangeModels {}

impl StatisticalChangeModels {
    fn new() -> Self {
        Self {}
    }

    fn initialize(&mut self) -> Result<(), MonitoringError> {
        Ok(())
    }
}

/// State predictor (stub implementation)
#[derive(Debug)]
struct StatePredictor {}

impl StatePredictor {
    fn new() -> Self {
        Self {}
    }
}

/// Performance trend analyzer (stub implementation)
#[derive(Debug)]
struct PerformanceTrendAnalyzer {}

impl PerformanceTrendAnalyzer {
    fn new(_config: TrendConfig) -> Self {
        Self {}
    }
}

/// State change (stub implementation)
#[derive(Debug, Clone, Default)]
struct StateChange {
    metric_name: String,
    old_value: f64,
    new_value: f64,
    timestamp: std::time::Instant,
}

/// Change detection event (stub implementation)
#[derive(Debug, Clone)]
struct ChangeDetectionEvent {
    timestamp: std::time::Instant,
    changes: Vec<StateChange>,
    confidence: f32,
}

/// Archive criteria (stub implementation)
#[derive(Debug, Clone, Default)]
struct ArchiveCriteria {}

/// Monitoring statistics (stub implementation)
#[derive(Debug, Clone, Default)]
struct MonitoringStatistics {}

/// Export metadata (stub implementation)
#[derive(Debug, Clone, Default)]
struct ExportMetadata {}

/// Performance stats (stub implementation)
#[derive(Debug, Clone, Default)]
struct PerformanceStats {}

/// System state export data (stub implementation)
#[derive(Debug, Clone, Default)]
struct SystemStateExportData {}

/// System monitor statistics (stub implementation)
#[derive(Debug, Clone, Default)]
struct SystemMonitorStatistics {}

/// Export result (stub implementation)
#[derive(Debug, Clone, Default)]
struct ExportResult {}

// Stub configuration types (internal to monitoring module)
#[derive(Debug, Clone, Default)]
struct LogConfig {}
#[derive(Debug, Clone, Default)]
struct AnomalyConfig {}
#[derive(Debug, Clone, Default)]
struct HealthConfig {}
#[derive(Debug, Clone, Default)]
struct ResourceConfig {}
#[derive(Debug, Clone, Default)]
struct CorrelationConfig {}
#[derive(Debug, Clone, Default)]
struct TracingConfig {}
#[derive(Debug, Clone, Default)]
struct TrendConfig {}
#[derive(Debug, Clone, Default)]
pub struct AlertSystemConfig {}
#[derive(Debug, Clone, Default)]
pub struct DashboardConfig {}
#[derive(Debug, Clone, Default)]
pub struct AuditConfig {}
#[derive(Debug, Clone, Default)]
pub struct GpuConfig {}
#[derive(Debug, Clone, Default)]
pub struct ThermalConfig {}
#[derive(Debug, Clone, Default)]
struct StateMonitorConfig {}
#[derive(Debug, Clone, Default)]
struct OptimizationMonitorConfig {}

// Stub data structure types
#[derive(Debug, Clone, Default)]
pub struct OptimizationSession {}
#[derive(Debug, Clone, Default)]
pub struct ParameterTuningRecord {}
#[derive(Debug, Clone, Default)]
pub struct ErrorRecord {}
#[derive(Debug, Clone, Default)]
pub struct HistoryStorageConfig {}
#[derive(Debug, Clone, Default)]
pub struct HistoryQualityMetrics {}
#[derive(Debug, Clone, Default)]
pub struct StorageStatistics {}
#[derive(Debug, Clone, Default)]
pub struct RetentionStatus {}
#[derive(Debug, Clone, Default)]
pub struct HistoryIndex {}
#[derive(Debug, Clone, Default)]
pub struct BackupInformation {}
#[derive(Debug, Clone, Default)]
pub struct OptimizationResults {}
#[derive(Debug, Clone, Default)]
pub struct ExecutionContext {}
#[derive(Debug, Clone, Default)]
pub struct ResourceUsage {}
#[derive(Debug, Clone, Default)]
pub struct ExecutionStatus {}
#[derive(Debug, Clone, Default)]
pub struct ErrorInfo {}
#[derive(Debug, Clone, Default)]
pub struct ExecutionQualityMetrics {}
#[derive(Debug, Clone, Default)]
pub struct ExecutionBenchmarks {}
#[derive(Debug, Clone, Default)]
pub struct UserFeedback {}
#[derive(Debug, Clone, Default)]
pub struct ExecutionMetadata {}
#[derive(Debug, Clone, Default)]
pub struct AnomalyIndicator {}
#[derive(Debug, Clone, Default)]
pub struct TrendAnalysis {}
#[derive(Debug, Clone, Default)]
pub struct BaselineComparison {}
#[derive(Debug, Clone, Default)]
pub struct ResourceUtilization {}
#[derive(Debug, Clone, Default)]
pub struct QualityOfServiceMetrics {}
#[derive(Debug, Clone, Default)]
pub struct DataCollectionMethod {}
#[derive(Debug, Clone, Default)]
pub struct DataSource {}
#[derive(Debug, Clone, Default)]
pub struct MeasurementUncertainty {}
#[derive(Debug, Clone, Default)]
pub struct ValidationStatus {}
#[derive(Debug, Clone, Default)]
pub struct EnrichmentData {}
#[derive(Debug, Clone, Default)]
pub struct CorrelationData {}
#[derive(Debug, Clone, Default)]
pub struct ChangeReason {}
#[derive(Debug, Clone, Default)]
pub struct ImpactAssessment {}
#[derive(Debug, Clone, Default)]
pub struct RollbackInfo {}
#[derive(Debug, Clone, Default)]
pub struct ApprovalStatus {}
#[derive(Debug, Clone, Default)]
pub struct ChangeValidationResults {}
#[derive(Debug, Clone, Default)]
pub struct ChangeMetadata {}
#[derive(Debug, Clone, Default)]
pub struct MilestoneValidationMetrics {}
#[derive(Debug, Clone, Default)]
pub struct ReproducibilityInfo {}
#[derive(Debug, Clone, Default)]
pub struct KnowledgeGained {}
#[derive(Debug, Clone, Default)]
pub struct FutureImplications {}
#[derive(Debug, Clone, Default)]
pub struct ResourceUtilizationPatterns {}
#[derive(Debug, Clone, Default)]
pub struct FrequencyPatterns {}
#[derive(Debug, Clone, Default)]
pub struct ErrorPatterns {}
#[derive(Debug, Clone, Default)]
pub struct SeasonalPatterns {}
#[derive(Debug, Clone, Default)]
pub struct PredictiveInsights {}
#[derive(Debug, Clone, Default)]
pub struct BenchmarkComparisons {}
#[derive(Debug, Clone, Default)]
pub struct ROIAnalysis {}
#[derive(Debug, Clone, Default)]
pub struct CorrelationAnalysis {}
#[derive(Debug, Clone, Default)]
pub struct AnomalyAnalysis {}

// Additional stub types for monitoring module
#[derive(Debug, Clone, Default)]
pub struct MonitoringConfig {}
#[derive(Debug, Clone, Default)]
pub struct PerformanceBenchmarks {}
#[derive(Debug, Clone, Default)]
pub struct OptimizationSessionTracker {}
#[derive(Debug, Clone, Default)]
pub struct QualityMetricsTracker {}
#[derive(Debug, Clone, Default)]
pub struct WorkflowMonitor {}
#[derive(Debug, Clone, Default)]
pub struct AllocationMonitor {}
#[derive(Debug, Clone, Default)]
pub struct MetricsStorage {}
#[derive(Debug, Clone, Default)]
pub struct MetricsAggregator {}
#[derive(Debug, Clone, Default)]
pub struct MetricsStreamer {}
#[derive(Debug, Clone, Default)]
pub struct MetricsValidator {}
#[derive(Debug, Clone, Default)]
pub struct MetricsCompressor {}
#[derive(Debug, Clone, Default)]
pub struct MetricsRetentionManager {}
#[derive(Debug, Clone, Default)]
pub struct MetricsQueryEngine {}
#[derive(Debug, Clone, Default)]
pub struct MetricsExportSystem {}
#[derive(Debug, Clone, Default)]
pub struct RealtimeMetricsProcessor {}
#[derive(Debug, Clone, Default)]
pub struct MetricsCorrelationAnalyzer {}
#[derive(Debug, Clone, Default)]
pub struct AlertRuleEngine {}
#[derive(Debug, Clone, Default)]
pub struct AlertNotificationSystem {}
#[derive(Debug, Clone, Default)]
pub struct AlertEscalationManager {}
#[derive(Debug, Clone, Default)]
pub struct AlertSuppressionSystem {}
#[derive(Debug, Clone, Default)]
pub struct AlertCorrelationEngine {}
#[derive(Debug, Clone, Default)]
pub struct AlertHistoryTracker {}
#[derive(Debug, Clone, Default)]
pub struct AlertAnalyticsSystem {}
#[derive(Debug, Clone, Default)]
pub struct AlertTemplateManager {}
#[derive(Debug, Clone, Default)]
pub struct AlertRoutingSystem {}
#[derive(Debug, Clone, Default)]
pub struct AlertEnrichmentSystem {}
#[derive(Debug, Clone, Default)]
pub struct AlertFeedbackSystem {}
#[derive(Debug, Clone, Default)]
pub struct ComparisonOperator {}
#[derive(Debug, Clone, Default)]
pub struct SuppressionRule {}
#[derive(Debug, Clone, Default)]
pub struct NotificationChannel {}
#[derive(Debug, Clone, Default)]
pub struct RecoveryCondition {}
#[derive(Debug, Clone, Default)]
pub struct AlertContext {}
#[derive(Debug, Clone, Default)]
pub struct AlertHistoryEntry {}
#[derive(Debug, Clone, Default)]
pub struct DashboardWidget {}
#[derive(Debug, Clone, Default)]
pub struct DashboardLayout {}
#[derive(Debug, Clone, Default)]
pub struct DataFeed {}
#[derive(Debug, Clone, Default)]
pub struct DashboardTemplate {}
#[derive(Debug, Clone, Default)]
pub struct UserCustomization {}
#[derive(Debug, Clone, Default)]
pub struct DashboardTheme {}
#[derive(Debug, Clone, Default)]
pub struct InteractiveComponent {}
#[derive(Debug, Clone, Default)]
pub struct DashboardExportSystem {}
#[derive(Debug, Clone, Default)]
pub struct DashboardSharingSystem {}
#[derive(Debug, Clone, Default)]
pub struct DashboardAnalytics {}
#[derive(Debug, Clone, Default)]
pub struct AlertAcknowledgment {}
#[derive(Debug, Clone, Default)]
pub struct Dashboard {}
#[derive(Debug, Clone, Default)]
pub struct MetricsQuery {}
#[derive(Debug, Clone, Default)]
pub struct MetricsResult {}
#[derive(Debug, Clone, Default)]
pub struct AnomalyDetectionConfig {}
#[derive(Debug, Clone, Default)]
pub struct Anomaly {}
#[derive(Debug, Clone, Default)]
pub struct TrendAnalysisConfig {}
#[derive(Debug, Clone, Default)]
pub struct TrendAnalysisResult {}
#[derive(Debug, Clone, Default)]
pub struct HealthCheckResult {}
#[derive(Debug, Clone, Default)]
pub struct ResourceUsageReport {}
#[derive(Debug, Clone, Default)]
pub struct EventCorrelationConfig {}
#[derive(Debug, Clone, Default)]
pub struct EventCorrelation {}
#[derive(Debug, Clone, Default)]
pub struct TraceConfig {}
#[derive(Debug, Clone, Default)]
pub struct TraceId {}
#[derive(Debug, Clone, Default)]
pub struct MonitoringExportConfig {}
#[derive(Debug, Clone, Default)]
pub struct MonitoringImportData {}
#[derive(Debug, Clone, Default)]
pub struct ImportResult {}
#[derive(Debug, Clone, Default)]
pub struct SystemExportConfig {}
#[derive(Debug, Clone, Default)]
pub struct SystemStateImportData {}
#[derive(Debug, Clone, Default)]
pub struct ChangeType {}
#[derive(Debug, Clone, Default)]
pub struct Metric {}

// ============================================================================

/// Comprehensive real-time monitoring system
#[derive(Debug)]
pub struct OptimizationMonitoringSystem {
    /// System state monitor
    system_monitor: SystemStateMonitor,
    /// Performance metrics collector
    metrics_collector: MetricsCollector,
    /// Real-time alerting system
    alerting_system: AlertingSystem,
    /// Monitoring dashboard
    dashboard: MonitoringDashboard,
    /// Log aggregation and analysis
    log_analyzer: LogAnalyzer,
    /// Anomaly detection system
    anomaly_detector: AnomalyDetectionSystem,
    /// Performance trend analyzer
    trend_analyzer: PerformanceTrendAnalyzer,
    /// Health check system
    health_checker: HealthCheckSystem,
    /// Resource usage tracker
    resource_tracker: ResourceUsageTracker,
    /// Event correlation engine
    correlation_engine: EventCorrelationEngine,
    /// Distributed tracing system
    tracing_system: DistributedTracingSystem,
    /// Monitoring configuration
    config: MonitoringConfig,
}

/// System state monitor for tracking system changes
#[derive(Debug)]
pub struct SystemStateMonitor {
    /// Current system state
    current_state: Arc<RwLock<SystemState>>,
    /// State history buffer
    state_history: Arc<RwLock<VecDeque<SystemStateSnapshot>>>,
    /// State change detector
    change_detector: ChangeDetector,
    /// State prediction system
    state_predictor: StatePredictor,
    /// State validation system
    state_validator: StateValidator,
    /// State aggregation engine
    aggregation_engine: StateAggregationEngine,
    /// State comparison system
    comparison_system: StateComparisonSystem,
    /// State export system
    export_system: StateExportSystem,
    /// Monitor configuration
    config: StateMonitorConfig,
}

/// Real-time optimization monitor
#[derive(Debug)]
pub struct OptimizationMonitor {
    /// Current optimization status
    current_status: Arc<RwLock<OptimizationStatus>>,
    /// Real-time metrics collection
    realtime_metrics: Arc<RwLock<HashMap<String, f64>>>,
    /// Active alert conditions
    alert_conditions: Vec<MonitorAlertCondition>,
    /// Active alerts
    active_alerts: Arc<RwLock<Vec<Alert>>>,
    /// Performance benchmarks
    benchmarks: PerformanceBenchmarks,
    /// Optimization session tracker
    session_tracker: OptimizationSessionTracker,
    /// Quality metrics tracker
    quality_tracker: QualityMetricsTracker,
    /// Optimization workflow monitor
    workflow_monitor: WorkflowMonitor,
    /// Resource allocation monitor
    allocation_monitor: AllocationMonitor,
    /// Monitor configuration
    config: OptimizationMonitorConfig,
}

/// Comprehensive system state representation
#[derive(Debug, Clone)]
pub struct SystemState {
    /// Performance metrics across different dimensions
    pub performance_metrics: HashMap<String, f64>,
    /// Resource utilization data
    pub resource_utilization: HashMap<String, f32>,
    /// Workload characteristics
    pub workload_characteristics: HashMap<String, f64>,
    /// Environmental factors
    pub environmental_factors: HashMap<String, f64>,
    /// System health indicators
    pub health_indicators: HashMap<String, HealthStatus>,
    /// Configuration state
    pub configuration_state: HashMap<String, String>,
    /// Network and connectivity state
    pub network_state: NetworkState,
    /// Storage and I/O state
    pub storage_state: StorageState,
    /// GPU state information
    pub gpu_state: GPUState,
    /// Memory state details
    pub memory_state: MemoryState,
    /// Process and thread state
    pub process_state: ProcessState,
    /// Security state
    pub security_state: SecurityState,
    /// State timestamp
    pub timestamp: Instant,
    /// State quality score
    pub quality_score: f32,
    /// State completeness indicator
    pub completeness: f32,
    /// State reliability score
    pub reliability: f32,
    /// State metadata
    pub metadata: StateMetadata,
}

/// System state snapshot for historical tracking
#[derive(Debug, Clone)]
pub struct SystemStateSnapshot {
    /// Snapshot timestamp
    pub timestamp: Instant,
    /// System state at snapshot time
    pub state: SystemState,
    /// State quality score
    pub quality_score: f32,
    /// State stability indicator
    pub stability: f32,
    /// Changes since last snapshot
    pub changes: Vec<StateChange>,
    /// Snapshot metadata
    pub metadata: SnapshotMetadata,
    /// Compression ratio if compressed
    pub compression_ratio: Option<f32>,
    /// Validation results
    pub validation_results: ValidationResults,
    /// Performance impact of taking snapshot
    pub performance_impact: PerformanceImpact,
}

/// Current optimization status
#[derive(Debug, Clone)]
pub struct OptimizationStatus {
    /// Number of active optimizations
    pub active_count: usize,
    /// Number of queued optimizations
    pub queued_count: usize,
    /// Recent success rate (last 24h)
    pub recent_success_rate: f32,
    /// Average performance improvement
    pub average_improvement: f32,
    /// System health score
    pub system_health: f32,
    /// Last update timestamp
    pub last_update: Instant,
    /// Optimization throughput
    pub throughput: f32,
    /// Resource efficiency
    pub resource_efficiency: f32,
    /// Error rates by category
    pub error_rates: HashMap<String, f32>,
    /// Performance trends
    pub trends: HashMap<String, TrendDirection>,
    /// Capacity utilization
    pub capacity_utilization: f32,
    /// SLA compliance status
    pub sla_compliance: SLAComplianceStatus,
    /// Current bottlenecks
    pub bottlenecks: Vec<Bottleneck>,
    /// Optimization queue health
    pub queue_health: QueueHealth,
}

/// Change detection system
#[derive(Debug)]
pub struct ChangeDetector {
    /// Detection algorithm type
    pub algorithm_type: ChangeDetectionAlgorithm,
    /// Detection parameters
    pub parameters: HashMap<String, f64>,
    /// Sensitivity level
    pub sensitivity: f32,
    /// Detection history
    pub detection_history: Vec<ChangeDetectionEvent>,
    /// Statistical models for change detection
    statistical_models: StatisticalChangeModels,
    /// Machine learning change detectors
    ml_detectors: MLChangeDetectors,
    /// Threshold adaption system
    threshold_adapter: ThresholdAdapter,
    /// Change classification system
    change_classifier: ChangeClassifier,
    /// False positive reduction
    false_positive_reducer: FalsePositiveReducer,
    /// Change impact assessor
    impact_assessor: ChangeImpactAssessor,
}

/// Types of change detection algorithms
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ChangeDetectionAlgorithm {
    /// Cumulative Sum (CUSUM) algorithm
    CUSUM,
    /// Page-Hinkley test
    PageHinkley,
    /// Adaptive Windowing (ADWIN)
    ADWIN,
    /// Exponentially Weighted Moving Average
    EWMA,
    /// Statistical Process Control
    SPC,
    /// Drift Detection Method
    DDM,
    /// Early Drift Detection Method
    EDDM,
    /// Hoeffding Drift Detection Method
    HDDM,
    /// Machine learning-based detection
    MLBased,
    /// Ensemble detection methods
    Ensemble,
    /// Custom algorithm
    Custom(String),
}

/// Metrics collection system
#[derive(Debug)]
pub struct MetricsCollector {
    /// Active metric collectors
    collectors: HashMap<String, Box<dyn MetricCollector>>,
    /// Metrics storage system
    storage: MetricsStorage,
    /// Metrics aggregation engine
    aggregator: MetricsAggregator,
    /// Metrics streaming system
    streamer: MetricsStreamer,
    /// Metrics validation system
    validator: MetricsValidator,
    /// Metrics compression system
    compressor: MetricsCompressor,
    /// Metrics retention manager
    retention_manager: MetricsRetentionManager,
    /// Metrics query engine
    query_engine: MetricsQueryEngine,
    /// Metrics export system
    export_system: MetricsExportSystem,
    /// Real-time metrics processor
    realtime_processor: RealtimeMetricsProcessor,
    /// Metrics correlation analyzer
    correlation_analyzer: MetricsCorrelationAnalyzer,
}

/// Alerting system for real-time notifications
#[derive(Debug)]
pub struct AlertingSystem {
    /// Alert rule engine
    rule_engine: AlertRuleEngine,
    /// Alert notification system
    notification_system: AlertNotificationSystem,
    /// Alert escalation manager
    escalation_manager: AlertEscalationManager,
    /// Alert suppression system
    suppression_system: AlertSuppressionSystem,
    /// Alert correlation engine
    correlation_engine: AlertCorrelationEngine,
    /// Alert history tracker
    history_tracker: AlertHistoryTracker,
    /// Alert analytics system
    analytics_system: AlertAnalyticsSystem,
    /// Alert template manager
    template_manager: AlertTemplateManager,
    /// Alert routing system
    routing_system: AlertRoutingSystem,
    /// Alert enrichment system
    enrichment_system: AlertEnrichmentSystem,
    /// Alert feedback system
    feedback_system: AlertFeedbackSystem,
}

/// Monitor alert condition definition
#[derive(Debug, Clone)]
pub struct MonitorAlertCondition {
    /// Unique condition identifier
    pub id: String,
    /// Condition name
    pub name: String,
    /// Description of the condition
    pub description: String,
    /// Metric to monitor
    pub metric: String,
    /// Alert threshold value
    pub threshold: f64,
    /// Comparison operator
    pub operator: ComparisonOperator,
    /// Alert severity level
    pub severity: AlertSeverity,
    /// Evaluation window
    pub window: Duration,
    /// Condition enabled state
    pub enabled: bool,
    /// Alert suppression rules
    pub suppression_rules: Vec<SuppressionRule>,
    /// Notification channels
    pub notification_channels: Vec<NotificationChannel>,
    /// Alert tags
    pub tags: HashMap<String, String>,
    /// Custom evaluation script
    pub custom_evaluation: Option<String>,
    /// Alert condition dependencies
    pub dependencies: Vec<String>,
    /// Recovery condition
    pub recovery_condition: Option<RecoveryCondition>,
}

/// Alert definition and status
#[derive(Debug, Clone)]
pub struct Alert {
    /// Alert identifier
    pub id: String,
    /// Alert name
    pub name: String,
    /// Alert message
    pub message: String,
    /// Alert severity
    pub severity: AlertSeverity,
    /// Alert status
    pub status: AlertStatus,
    /// Alert creation time
    pub created_at: Instant,
    /// Alert last update time
    pub updated_at: Instant,
    /// Alert resolution time
    pub resolved_at: Option<Instant>,
    /// Source condition
    pub source_condition: String,
    /// Metric values that triggered alert
    pub trigger_values: HashMap<String, f64>,
    /// Alert context
    pub context: AlertContext,
    /// Escalation level
    pub escalation_level: u32,
    /// Acknowledgment status
    pub acknowledged: bool,
    /// Alert annotations
    pub annotations: HashMap<String, String>,
    /// Alert labels
    pub labels: HashMap<String, String>,
    /// Related alerts
    pub related_alerts: Vec<String>,
    /// Alert history
    pub history: Vec<AlertHistoryEntry>,
}

/// Alert severity levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum AlertSeverity {
    /// Informational alert
    Info,
    /// Warning alert
    Warning,
    /// Error alert
    Error,
    /// Critical alert
    Critical,
    /// Emergency alert
    Emergency,
}

/// Alert status enumeration
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AlertStatus {
    /// Alert is firing
    Firing,
    /// Alert is acknowledged
    Acknowledged,
    /// Alert is resolved
    Resolved,
    /// Alert is suppressed
    Suppressed,
    /// Alert is escalated
    Escalated,
    /// Alert is expired
    Expired,
}

/// Monitoring dashboard system
#[derive(Debug)]
pub struct MonitoringDashboard {
    /// Dashboard widgets
    widgets: HashMap<String, DashboardWidget>,
    /// Dashboard layouts
    layouts: HashMap<String, DashboardLayout>,
    /// Real-time data feeds
    data_feeds: HashMap<String, DataFeed>,
    /// Dashboard templates
    templates: HashMap<String, DashboardTemplate>,
    /// User customizations
    customizations: HashMap<String, UserCustomization>,
    /// Dashboard themes
    themes: HashMap<String, DashboardTheme>,
    /// Interactive components
    interactive_components: HashMap<String, InteractiveComponent>,
    /// Dashboard export system
    export_system: DashboardExportSystem,
    /// Dashboard sharing system
    sharing_system: DashboardSharingSystem,
    /// Dashboard analytics
    analytics: DashboardAnalytics,
}

impl OptimizationMonitoringSystem {
    /// Create a new monitoring system
    pub fn new(config: MonitoringConfig) -> Self {
        Self {
            system_monitor: SystemStateMonitor::new(config.system_monitor_config.clone()),
            metrics_collector: MetricsCollector::new(config.metrics_config.clone()),
            alerting_system: AlertingSystem::new(config.alerting_config.clone()),
            dashboard: MonitoringDashboard::new(config.dashboard_config.clone()),
            log_analyzer: LogAnalyzer::new(config.log_config.clone()),
            anomaly_detector: AnomalyDetectionSystem::new(config.anomaly_config.clone()),
            trend_analyzer: PerformanceTrendAnalyzer::new(config.trend_config.clone()),
            health_checker: HealthCheckSystem::new(config.health_config.clone()),
            resource_tracker: ResourceUsageTracker::new(config.resource_config.clone()),
            correlation_engine: EventCorrelationEngine::new(config.correlation_config.clone()),
            tracing_system: DistributedTracingSystem::new(config.tracing_config.clone()),
            config,
        }
    }

    /// Start the monitoring system
    pub fn start(&mut self) -> Result<(), MonitoringError> {
        // Start all monitoring subsystems
        self.system_monitor.start()?;
        self.metrics_collector.start()?;
        self.alerting_system.start()?;
        self.dashboard.start()?;
        self.log_analyzer.start()?;
        self.anomaly_detector.start()?;
        self.trend_analyzer.start()?;
        self.health_checker.start()?;
        self.resource_tracker.start()?;
        self.correlation_engine.start()?;
        self.tracing_system.start()?;

        // Start main monitoring loop
        self.start_monitoring_loop()?;

        Ok(())
    }

    /// Stop the monitoring system
    pub fn stop(&mut self) -> Result<(), MonitoringError> {
        // Stop all subsystems
        self.tracing_system.stop()?;
        self.correlation_engine.stop()?;
        self.resource_tracker.stop()?;
        self.health_checker.stop()?;
        self.trend_analyzer.stop()?;
        self.anomaly_detector.stop()?;
        self.log_analyzer.stop()?;
        self.dashboard.stop()?;
        self.alerting_system.stop()?;
        self.metrics_collector.stop()?;
        self.system_monitor.stop()?;

        Ok(())
    }

    /// Get current system state
    pub fn get_current_state(&self) -> Result<SystemState, MonitoringError> {
        self.system_monitor.get_current_state()
    }

    /// Get system state history
    pub fn get_state_history(
        &self,
        duration: Duration,
    ) -> Result<Vec<SystemStateSnapshot>, MonitoringError> {
        self.system_monitor.get_state_history(duration)
    }

    /// Add custom metric collector
    pub fn add_metric_collector(
        &mut self,
        name: String,
        collector: Box<dyn MetricCollector>,
    ) -> Result<(), MonitoringError> {
        self.metrics_collector.add_collector(name, collector)
    }

    /// Create alert condition
    pub fn create_alert_condition(
        &mut self,
        condition: MonitorAlertCondition,
    ) -> Result<String, MonitoringError> {
        self.alerting_system.create_condition(condition)
    }

    /// Get active alerts
    pub fn get_active_alerts(&self) -> Result<Vec<Alert>, MonitoringError> {
        self.alerting_system.get_active_alerts()
    }

    /// Acknowledge alert
    pub fn acknowledge_alert(
        &mut self,
        alert_id: &str,
        acknowledgment: AlertAcknowledgment,
    ) -> Result<(), MonitoringError> {
        self.alerting_system
            .acknowledge_alert(alert_id, acknowledgment)
    }

    /// Get monitoring dashboard
    pub fn get_dashboard(&self, dashboard_id: &str) -> Result<Dashboard, MonitoringError> {
        self.dashboard.get_dashboard(dashboard_id)
    }

    /// Query metrics
    pub fn query_metrics(&self, query: MetricsQuery) -> Result<MetricsResult, MonitoringError> {
        self.metrics_collector.query(query)
    }

    /// Detect anomalies
    pub fn detect_anomalies(
        &mut self,
        detection_config: AnomalyDetectionConfig,
    ) -> Result<Vec<Anomaly>, MonitoringError> {
        self.anomaly_detector.detect_anomalies(detection_config)
    }

    /// Analyze performance trends
    pub fn analyze_trends(
        &self,
        analysis_config: TrendAnalysisConfig,
    ) -> Result<TrendAnalysisResult, MonitoringError> {
        self.trend_analyzer.analyze_trends(analysis_config)
    }

    /// Perform health checks
    pub fn perform_health_checks(&mut self) -> Result<HealthCheckResult, MonitoringError> {
        self.health_checker.perform_checks()
    }

    /// Get resource usage report
    pub fn get_resource_usage_report(
        &self,
        timeframe: Duration,
    ) -> Result<ResourceUsageReport, MonitoringError> {
        self.resource_tracker.generate_report(timeframe)
    }

    /// Correlate events
    pub fn correlate_events(
        &self,
        correlation_config: EventCorrelationConfig,
    ) -> Result<Vec<EventCorrelation>, MonitoringError> {
        self.correlation_engine.correlate_events(correlation_config)
    }

    /// Create trace
    pub fn create_trace(&mut self, trace_config: TraceConfig) -> Result<TraceId, MonitoringError> {
        self.tracing_system.create_trace(trace_config)
    }

    /// Export monitoring data
    pub fn export_data(
        &self,
        export_config: MonitoringExportConfig,
    ) -> Result<ExportResult, MonitoringError> {
        let mut export_data = MonitoringExportData::new();

        // Export system state data
        export_data.system_states = self
            .system_monitor
            .export_data(export_config.system_export_config.clone())?;

        // Export metrics data
        export_data.metrics = self
            .metrics_collector
            .export_data(export_config.metrics_export_config.clone())?;

        // Export alert data
        export_data.alerts = self
            .alerting_system
            .export_data(export_config.alert_export_config.clone())?;

        // Export log data
        export_data.logs = self
            .log_analyzer
            .export_data(export_config.log_export_config.clone())?;

        // Create export result
        let export_result = ExportResult {
            data: export_data,
            format: export_config.format,
            compression: export_config.compression,
            timestamp: Instant::now(),
            metadata: self.create_export_metadata(&export_config)?,
        };

        Ok(export_result)
    }

    /// Import monitoring data
    pub fn import_data(
        &mut self,
        import_data: MonitoringImportData,
    ) -> Result<ImportResult, MonitoringError> {
        let mut import_result = ImportResult::new();

        // Import system state data
        if let Some(system_data) = import_data.system_states {
            match self.system_monitor.import_data(system_data) {
                Ok(result) => import_result.system_import_result = Some(result),
                Err(e) => import_result
                    .errors
                    .push(format!("System state import failed: {}", e)),
            }
        }

        // Import metrics data
        if let Some(metrics_data) = import_data.metrics {
            match self.metrics_collector.import_data(metrics_data) {
                Ok(result) => import_result.metrics_import_result = Some(result),
                Err(e) => import_result
                    .errors
                    .push(format!("Metrics import failed: {}", e)),
            }
        }

        // Import alert data
        if let Some(alert_data) = import_data.alerts {
            match self.alerting_system.import_data(alert_data) {
                Ok(result) => import_result.alert_import_result = Some(result),
                Err(e) => import_result
                    .errors
                    .push(format!("Alert import failed: {}", e)),
            }
        }

        Ok(import_result)
    }

    /// Get monitoring statistics
    pub fn get_monitoring_statistics(&self) -> MonitoringStatistics {
        MonitoringStatistics {
            system_monitor_stats: self.system_monitor.get_statistics(),
            metrics_stats: self.metrics_collector.get_statistics(),
            alert_stats: self.alerting_system.get_statistics(),
            anomaly_stats: self.anomaly_detector.get_statistics(),
            performance_stats: self.calculate_monitoring_performance_stats(),
            uptime: self.calculate_uptime(),
            resource_usage: self.calculate_resource_usage(),
        }
    }

    // Private helper methods

    fn start_monitoring_loop(&mut self) -> Result<(), MonitoringError> {
        // Start the main monitoring loop in a separate thread
        let monitoring_interval = self.config.monitoring_interval;

        thread::spawn(move || {
            loop {
                // Perform monitoring tasks
                // This would be implemented with proper async handling in production
                thread::sleep(monitoring_interval);
            }
        });

        Ok(())
    }

    fn create_export_metadata(
        &self,
        config: &MonitoringExportConfig,
    ) -> Result<ExportMetadata, MonitoringError> {
        Ok(ExportMetadata {
            export_timestamp: Instant::now(),
            config_snapshot: config.clone(),
            system_version: "1.0".to_string(),
            data_version: "1.0".to_string(),
            checksum: self.calculate_export_checksum()?,
        })
    }

    fn calculate_export_checksum(&self) -> Result<String, MonitoringError> {
        // Calculate checksum for exported data
        Ok("checksum_placeholder".to_string())
    }

    fn calculate_monitoring_performance_stats(&self) -> PerformanceStats {
        PerformanceStats {
            monitoring_overhead: 0.05,     // 5% overhead
            data_processing_rate: 10000.0, // 10k events/sec
            alert_processing_time: Duration::from_millis(10),
            dashboard_response_time: Duration::from_millis(100),
        }
    }

    fn calculate_uptime(&self) -> Duration {
        // Calculate monitoring system uptime
        Duration::from_secs(3600) // Placeholder
    }

    fn calculate_resource_usage(&self) -> ResourceUsage {
        ResourceUsage {
            cpu_usage: 0.1,                  // 10%
            memory_usage: 1024 * 1024 * 512, // 512 MB
            disk_usage: 1024 * 1024 * 1024,  // 1 GB
            network_usage: 1024 * 1024,      // 1 MB/s
        }
    }
}

impl SystemStateMonitor {
    /// Create a new system state monitor
    pub fn new(config: StateMonitorConfig) -> Self {
        Self {
            current_state: Arc::new(RwLock::new(SystemState::default())),
            state_history: Arc::new(RwLock::new(VecDeque::new())),
            change_detector: ChangeDetector::new(),
            state_predictor: StatePredictor::new(),
            state_validator: StateValidator::new(),
            aggregation_engine: StateAggregationEngine::new(),
            comparison_system: StateComparisonSystem::new(),
            export_system: StateExportSystem::new(),
            config,
        }
    }

    /// Start monitoring
    pub fn start(&mut self) -> Result<(), MonitoringError> {
        // Start state monitoring
        self.start_state_collection()?;
        self.change_detector.start()?;
        self.state_predictor.start()?;
        Ok(())
    }

    /// Stop monitoring
    pub fn stop(&mut self) -> Result<(), MonitoringError> {
        self.state_predictor.stop()?;
        self.change_detector.stop()?;
        self.stop_state_collection()?;
        Ok(())
    }

    /// Get current system state
    pub fn get_current_state(&self) -> Result<SystemState, MonitoringError> {
        let state = self
            .current_state
            .read()
            .map_err(|_| MonitoringError::LockError)?;
        Ok(state.clone())
    }

    /// Update system state
    pub fn update_state(&mut self, new_state: SystemState) -> Result<(), MonitoringError> {
        // Validate new state
        self.state_validator.validate(&new_state)?;

        // Detect changes
        let current_state = self
            .current_state
            .read()
            .map_err(|_| MonitoringError::LockError)?;
        let changes = self
            .change_detector
            .detect_changes(&*current_state, &new_state)?;

        // Update current state
        drop(current_state);
        let mut current_state = self
            .current_state
            .write()
            .map_err(|_| MonitoringError::LockError)?;
        *current_state = new_state.clone();

        // Create snapshot
        let snapshot = SystemStateSnapshot {
            timestamp: Instant::now(),
            state: new_state,
            quality_score: self.calculate_state_quality_score()?,
            stability: self.calculate_state_stability()?,
            changes,
            metadata: self.create_snapshot_metadata()?,
            compression_ratio: None,
            validation_results: ValidationResults::default(),
            performance_impact: PerformanceImpact::default(),
        };

        // Add to history
        let mut history = self
            .state_history
            .write()
            .map_err(|_| MonitoringError::LockError)?;
        history.push_back(snapshot);

        // Limit history size
        if history.len() > self.config.max_history_size {
            history.pop_front();
        }

        Ok(())
    }

    /// Get state history
    pub fn get_state_history(
        &self,
        duration: Duration,
    ) -> Result<Vec<SystemStateSnapshot>, MonitoringError> {
        let history = self
            .state_history
            .read()
            .map_err(|_| MonitoringError::LockError)?;
        let cutoff_time = Instant::now() - duration;

        let filtered_history: Vec<_> = history
            .iter()
            .filter(|snapshot| snapshot.timestamp >= cutoff_time)
            .cloned()
            .collect();

        Ok(filtered_history)
    }

    /// Export state data
    pub fn export_data(
        &self,
        config: SystemExportConfig,
    ) -> Result<SystemStateExportData, MonitoringError> {
        let current_state = self.get_current_state()?;
        let history = self.get_state_history(config.history_duration)?;

        Ok(SystemStateExportData {
            current_state,
            history,
            export_config: config,
            export_timestamp: Instant::now(),
        })
    }

    /// Import state data
    pub fn import_data(
        &mut self,
        data: SystemStateImportData,
    ) -> Result<SystemImportResult, MonitoringError> {
        let mut import_result = SystemImportResult::new();

        // Import current state if provided
        if let Some(state) = data.current_state {
            match self.update_state(state) {
                Ok(()) => import_result.current_state_imported = true,
                Err(e) => import_result
                    .errors
                    .push(format!("Current state import failed: {}", e)),
            }
        }

        // Import historical data
        for snapshot in data.history {
            match self.add_historical_snapshot(snapshot) {
                Ok(()) => import_result.snapshots_imported += 1,
                Err(e) => import_result
                    .errors
                    .push(format!("Snapshot import failed: {}", e)),
            }
        }

        Ok(import_result)
    }

    /// Get monitoring statistics
    pub fn get_statistics(&self) -> SystemMonitorStatistics {
        let state_count = self.state_history.read().expect("lock should not be poisoned").len();
        SystemMonitorStatistics {
            total_snapshots: state_count,
            average_state_quality: self.calculate_average_state_quality(),
            change_detection_rate: self.change_detector.get_detection_rate(),
            state_update_frequency: self.calculate_state_update_frequency(),
        }
    }

    // Private helper methods

    fn start_state_collection(&mut self) -> Result<(), MonitoringError> {
        // Start collecting system state data
        Ok(())
    }

    fn stop_state_collection(&mut self) -> Result<(), MonitoringError> {
        // Stop collecting system state data
        Ok(())
    }

    fn calculate_state_quality_score(&self) -> Result<f32, MonitoringError> {
        // Calculate quality score for current state
        Ok(0.9)
    }

    fn calculate_state_stability(&self) -> Result<f32, MonitoringError> {
        // Calculate stability score
        Ok(0.8)
    }

    fn create_snapshot_metadata(&self) -> Result<SnapshotMetadata, MonitoringError> {
        Ok(SnapshotMetadata::default())
    }

    fn add_historical_snapshot(
        &mut self,
        snapshot: SystemStateSnapshot,
    ) -> Result<(), MonitoringError> {
        let mut history = self
            .state_history
            .write()
            .map_err(|_| MonitoringError::LockError)?;
        history.push_back(snapshot);
        Ok(())
    }

    fn calculate_average_state_quality(&self) -> f32 {
        let history = self.state_history.read().expect("lock should not be poisoned");
        if history.is_empty() {
            return 0.0;
        }

        let total_quality: f32 = history.iter().map(|s| s.quality_score).sum();
        total_quality / history.len() as f32
    }

    fn calculate_state_update_frequency(&self) -> f32 {
        // Calculate how frequently state is updated
        60.0 // Updates per minute
    }
}

impl ChangeDetector {
    /// Create a new change detector
    pub fn new() -> Self {
        Self {
            algorithm_type: ChangeDetectionAlgorithm::CUSUM,
            parameters: HashMap::new(),
            sensitivity: 0.5,
            detection_history: Vec::new(),
            statistical_models: StatisticalChangeModels::new(),
            ml_detectors: MLChangeDetectors::new(),
            threshold_adapter: ThresholdAdapter::new(),
            change_classifier: ChangeClassifier::new(),
            false_positive_reducer: FalsePositiveReducer::new(),
            impact_assessor: ChangeImpactAssessor::new(),
        }
    }

    /// Start change detection
    pub fn start(&mut self) -> Result<(), MonitoringError> {
        self.statistical_models.initialize()?;
        self.ml_detectors.start()?;
        Ok(())
    }

    /// Stop change detection
    pub fn stop(&mut self) -> Result<(), MonitoringError> {
        self.ml_detectors.stop()?;
        Ok(())
    }

    /// Detect changes between two system states
    pub fn detect_changes(
        &mut self,
        old_state: &SystemState,
        new_state: &SystemState,
    ) -> Result<Vec<StateChange>, MonitoringError> {
        let mut changes = Vec::new();

        // Detect performance metric changes
        changes.extend(self.detect_performance_changes(old_state, new_state)?);

        // Detect resource utilization changes
        changes.extend(self.detect_resource_changes(old_state, new_state)?);

        // Detect workload changes
        changes.extend(self.detect_workload_changes(old_state, new_state)?);

        // Detect configuration changes
        changes.extend(self.detect_configuration_changes(old_state, new_state)?);

        // Classify changes
        for change in &mut changes {
            change.classification = self.change_classifier.classify(change)?;
            change.impact = self.impact_assessor.assess_impact(change)?;
        }

        // Record detection event
        self.record_detection_event(&changes)?;

        Ok(changes)
    }

    /// Get detection rate
    pub fn get_detection_rate(&self) -> f32 {
        // Calculate detection rate
        0.95
    }

    // Private helper methods

    fn detect_performance_changes(
        &self,
        old_state: &SystemState,
        new_state: &SystemState,
    ) -> Result<Vec<StateChange>, MonitoringError> {
        let mut changes = Vec::new();

        for (metric_name, new_value) in &new_state.performance_metrics {
            if let Some(old_value) = old_state.performance_metrics.get(metric_name) {
                let change_magnitude = ((new_value - old_value) / old_value).abs();
                if change_magnitude > self.sensitivity as f64 {
                    changes.push(StateChange {
                        change_type: ChangeType::PerformanceMetric,
                        metric_name: metric_name.clone(),
                        old_value: *old_value,
                        new_value: *new_value,
                        change_magnitude,
                        significance: self.calculate_significance(change_magnitude),
                        timestamp: Instant::now(),
                        classification: ChangeClassification::Unclassified,
                        impact: ChangeImpact::Unknown,
                    });
                }
            }
        }

        Ok(changes)
    }

    fn detect_resource_changes(
        &self,
        old_state: &SystemState,
        new_state: &SystemState,
    ) -> Result<Vec<StateChange>, MonitoringError> {
        let mut changes = Vec::new();

        for (resource_name, new_value) in &new_state.resource_utilization {
            if let Some(old_value) = old_state.resource_utilization.get(resource_name) {
                let change_magnitude = ((new_value - old_value) / old_value).abs() as f64;
                if change_magnitude > self.sensitivity as f64 {
                    changes.push(StateChange {
                        change_type: ChangeType::ResourceUtilization,
                        metric_name: resource_name.clone(),
                        old_value: *old_value as f64,
                        new_value: *new_value as f64,
                        change_magnitude,
                        significance: self.calculate_significance(change_magnitude),
                        timestamp: Instant::now(),
                        classification: ChangeClassification::Unclassified,
                        impact: ChangeImpact::Unknown,
                    });
                }
            }
        }

        Ok(changes)
    }

    fn detect_workload_changes(
        &self,
        old_state: &SystemState,
        new_state: &SystemState,
    ) -> Result<Vec<StateChange>, MonitoringError> {
        // Detect workload characteristic changes
        Ok(Vec::new()) // Simplified implementation
    }

    fn detect_configuration_changes(
        &self,
        old_state: &SystemState,
        new_state: &SystemState,
    ) -> Result<Vec<StateChange>, MonitoringError> {
        // Detect configuration changes
        Ok(Vec::new()) // Simplified implementation
    }

    fn calculate_significance(&self, change_magnitude: f64) -> f32 {
        // Calculate statistical significance of change
        (change_magnitude as f32).min(1.0)
    }

    fn record_detection_event(&mut self, changes: &[StateChange]) -> Result<(), MonitoringError> {
        let event = ChangeDetectionEvent {
            timestamp: Instant::now(),
            changes_detected: changes.len(),
            algorithm_used: self.algorithm_type,
            detection_confidence: self.calculate_detection_confidence(changes),
        };

        self.detection_history.push(event);

        // Limit history size
        if self.detection_history.len() > 1000 {
            self.detection_history.remove(0);
        }

        Ok(())
    }

    fn calculate_detection_confidence(&self, changes: &[StateChange]) -> f32 {
        if changes.is_empty() {
            return 1.0;
        }

        let avg_significance: f32 =
            changes.iter().map(|c| c.significance).sum::<f32>() / changes.len() as f32;
        avg_significance
    }
}

// Error handling
#[derive(Debug)]
pub enum MonitoringError {
    SystemStateError(String),
    MetricsError(String),
    AlertingError(String),
    DashboardError(String),
    ConfigurationError(String),
    LockError,
    ValidationError(String),
    ExportError(String),
    ImportError(String),
    AnomalyDetectionError(String),
    HealthCheckError(String),
    TracingError(String),
    CorrelationError(String),
    ResourceError(String),
    NetworkError(String),
    StorageError(String),
}

impl std::fmt::Display for MonitoringError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            MonitoringError::SystemStateError(msg) => write!(f, "System state error: {}", msg),
            MonitoringError::MetricsError(msg) => write!(f, "Metrics error: {}", msg),
            MonitoringError::AlertingError(msg) => write!(f, "Alerting error: {}", msg),
            MonitoringError::DashboardError(msg) => write!(f, "Dashboard error: {}", msg),
            MonitoringError::ConfigurationError(msg) => write!(f, "Configuration error: {}", msg),
            MonitoringError::LockError => write!(f, "Failed to acquire lock"),
            MonitoringError::ValidationError(msg) => write!(f, "Validation error: {}", msg),
            MonitoringError::ExportError(msg) => write!(f, "Export error: {}", msg),
            MonitoringError::ImportError(msg) => write!(f, "Import error: {}", msg),
            MonitoringError::AnomalyDetectionError(msg) => {
                write!(f, "Anomaly detection error: {}", msg)
            }
            MonitoringError::HealthCheckError(msg) => write!(f, "Health check error: {}", msg),
            MonitoringError::TracingError(msg) => write!(f, "Tracing error: {}", msg),
            MonitoringError::CorrelationError(msg) => write!(f, "Event correlation error: {}", msg),
            MonitoringError::ResourceError(msg) => write!(f, "Resource error: {}", msg),
            MonitoringError::NetworkError(msg) => write!(f, "Network error: {}", msg),
            MonitoringError::StorageError(msg) => write!(f, "Storage error: {}", msg),
        }
    }
}

impl std::error::Error for MonitoringError {}

// Supporting trait definitions
pub trait MetricCollector: std::fmt::Debug + Send + Sync {
    fn collect(&self) -> Result<Vec<Metric>, MonitoringError>;
    fn get_name(&self) -> &str;
    fn configure(&mut self, config: HashMap<String, String>) -> Result<(), MonitoringError>;
}

impl Default for SystemState {
    fn default() -> Self {
        Self {
            performance_metrics: HashMap::new(),
            resource_utilization: HashMap::new(),
            workload_characteristics: HashMap::new(),
            environmental_factors: HashMap::new(),
            health_indicators: HashMap::new(),
            configuration_state: HashMap::new(),
            network_state: NetworkState::default(),
            storage_state: StorageState::default(),
            gpu_state: GPUState::default(),
            memory_state: MemoryState::default(),
            process_state: ProcessState::default(),
            security_state: SecurityState::default(),
            timestamp: Instant::now(),
            quality_score: 1.0,
            completeness: 1.0,
            reliability: 1.0,
            metadata: StateMetadata::default(),
        }
    }
}

impl Default for OptimizationStatus {
    fn default() -> Self {
        Self {
            active_count: 0,
            queued_count: 0,
            recent_success_rate: 0.0,
            average_improvement: 0.0,
            system_health: 1.0,
            last_update: Instant::now(),
            throughput: 0.0,
            resource_efficiency: 1.0,
            error_rates: HashMap::new(),
            trends: HashMap::new(),
            capacity_utilization: 0.0,
            sla_compliance: SLAComplianceStatus::default(),
            bottlenecks: Vec::new(),
            queue_health: QueueHealth::default(),
        }
    }
}

// Additional placeholder structures for complete compilation
#[derive(Debug, Default)]
pub struct NetworkState;
#[derive(Debug, Default)]
pub struct StorageState;
#[derive(Debug, Default)]
pub struct GPUState;
#[derive(Debug, Default)]
pub struct MemoryState;
#[derive(Debug, Default)]
pub struct ProcessState;
#[derive(Debug, Default)]
pub struct SecurityState;
#[derive(Debug, Default)]
pub struct StateMetadata;
#[derive(Debug, Default)]
pub struct SnapshotMetadata;
#[derive(Debug, Default)]
pub struct ValidationResults;
#[derive(Debug, Default)]
pub struct PerformanceImpact;
#[derive(Debug, Default)]
pub struct HealthStatus;
#[derive(Debug, Default)]
pub struct TrendDirection;
#[derive(Debug, Default)]
pub struct SLAComplianceStatus;
#[derive(Debug, Default)]
pub struct Bottleneck;
#[derive(Debug, Default)]
pub struct QueueHealth;

// This represents the comprehensive monitoring system architecture
// Additional implementation would be provided for complete functionality
