quantrs2_device/

provider_capability_discovery.rs

//! Advanced Provider Capability Discovery System
//!
//! This module provides comprehensive discovery, analysis, and management of quantum
//! computing provider capabilities. Features include real-time capability discovery,
//! comparative analysis, performance benchmarking, and intelligent provider selection
//! with SciRS2-powered analytics.

use std::collections::{BTreeMap, HashMap, HashSet};
use std::sync::{Arc, Mutex, RwLock};
use std::time::{Duration, Instant, SystemTime};

use serde::{Deserialize, Serialize};
use tokio::sync::{broadcast, mpsc};
use url::Url;

use quantrs2_circuit::prelude::*;
use quantrs2_core::{
    error::{QuantRS2Error, QuantRS2Result},
    gate::GateOp,
    qubit::QubitId,
};

// SciRS2 integration for advanced analytics
#[cfg(feature = "scirs2")]
use scirs2_stats::{
    corrcoef,
    distributions::{chi2, gamma, norm},
    kstest, mean, pearsonr, percentile, shapiro_wilk, spearmanr, std, ttest_ind, var, wilcoxon,
    Alternative, TTestResult,
};

#[cfg(feature = "scirs2")]
use scirs2_optimize::{differential_evolution, minimize, OptimizeResult};

#[cfg(feature = "scirs2")]
use scirs2_graph::{
    betweenness_centrality, closeness_centrality, dijkstra_path, minimum_spanning_tree, Graph,
};

// Fallback implementations
#[cfg(not(feature = "scirs2"))]
mod fallback_scirs2 {
    use scirs2_core::ndarray::{Array1, ArrayView1};

    pub fn mean(_data: &ArrayView1<f64>) -> Result<f64, String> {
        Ok(0.0)
    }
    pub fn std(_data: &ArrayView1<f64>, _ddof: i32) -> Result<f64, String> {
        Ok(1.0)
    }
    pub fn percentile(_data: &ArrayView1<f64>, _q: f64) -> Result<f64, String> {
        Ok(0.0)
    }
}

#[cfg(not(feature = "scirs2"))]
use fallback_scirs2::*;

use scirs2_core::ndarray::{Array1, Array2, ArrayView1};

use crate::{
    backend_traits::BackendCapabilities, calibration::DeviceCalibration,
    topology::HardwareTopology, translation::HardwareBackend, DeviceError, DeviceResult,
};

/// Comprehensive provider capability discovery and management system
pub struct ProviderCapabilityDiscoverySystem {
    /// System configuration
    config: DiscoveryConfig,
    /// Registered providers
    providers: Arc<RwLock<HashMap<String, ProviderInfo>>>,
    /// Capability cache
    capability_cache: Arc<RwLock<HashMap<String, CachedCapability>>>,
    /// Discovery engine
    discovery_engine: Arc<RwLock<CapabilityDiscoveryEngine>>,
    /// Analytics engine
    analytics: Arc<RwLock<CapabilityAnalytics>>,
    /// Comparison engine
    comparison_engine: Arc<RwLock<ProviderComparisonEngine>>,
    /// Monitoring system
    monitor: Arc<RwLock<CapabilityMonitor>>,
    /// Event broadcaster
    event_sender: broadcast::Sender<DiscoveryEvent>,
    /// Command receiver
    command_receiver: Arc<Mutex<mpsc::UnboundedReceiver<DiscoveryCommand>>>,
}

/// Configuration for capability discovery system
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DiscoveryConfig {
    /// Enable automatic discovery
    pub enable_auto_discovery: bool,
    /// Discovery interval in seconds
    pub discovery_interval: u64,
    /// Enable capability caching
    pub enable_caching: bool,
    /// Cache expiration time
    pub cache_expiration: Duration,
    /// Enable real-time monitoring
    pub enable_monitoring: bool,
    /// Enable analytics
    pub enable_analytics: bool,
    /// Discovery strategies
    pub discovery_strategies: Vec<DiscoveryStrategy>,
    /// Capability verification settings
    pub verification_config: VerificationConfig,
    /// Provider filtering settings
    pub filtering_config: FilteringConfig,
    /// Analytics configuration
    pub analytics_config: CapabilityAnalyticsConfig,
    /// Monitoring configuration
    pub monitoring_config: CapabilityMonitoringConfig,
    /// Comparison configuration
    pub comparison_config: ComparisonConfig,
}

/// Discovery strategies for finding providers
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum DiscoveryStrategy {
    /// API-based discovery
    APIDiscovery,
    /// Registry-based discovery
    RegistryDiscovery,
    /// Network-based discovery
    NetworkDiscovery,
    /// Configuration-based discovery
    ConfigurationDiscovery,
    /// Machine learning-enhanced discovery
    MLEnhancedDiscovery,
    /// Hybrid multi-strategy discovery
    HybridDiscovery,
}

/// Verification configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VerificationConfig {
    /// Enable capability verification
    pub enable_verification: bool,
    /// Verification timeout
    pub verification_timeout: Duration,
    /// Verification strategies
    pub verification_strategies: Vec<VerificationStrategy>,
    /// Required verification confidence
    pub min_verification_confidence: f64,
    /// Enable continuous verification
    pub enable_continuous_verification: bool,
    /// Verification frequency
    pub verification_frequency: Duration,
}

/// Verification strategies
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum VerificationStrategy {
    /// API endpoint testing
    EndpointTesting,
    /// Capability probing
    CapabilityProbing,
    /// Benchmark testing
    BenchmarkTesting,
    /// Historical analysis
    HistoricalAnalysis,
    /// Community validation
    CommunityValidation,
}

/// Provider filtering configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FilteringConfig {
    /// Enable provider filtering
    pub enable_filtering: bool,
    /// Minimum capability requirements
    pub min_requirements: CapabilityRequirements,
    /// Excluded providers
    pub excluded_providers: HashSet<String>,
    /// Preferred providers
    pub preferred_providers: Vec<String>,
    /// Quality thresholds
    pub quality_thresholds: QualityThresholds,
    /// Geographic restrictions
    pub geographic_restrictions: Option<GeographicRestrictions>,
}

/// Capability requirements for filtering
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CapabilityRequirements {
    /// Minimum number of qubits
    pub min_qubits: Option<usize>,
    /// Maximum error rate
    pub max_error_rate: Option<f64>,
    /// Required gate types
    pub required_gates: HashSet<String>,
    /// Required connectivity
    pub required_connectivity: Option<ConnectivityRequirement>,
    /// Required features
    pub required_features: HashSet<ProviderFeature>,
    /// Performance requirements
    pub performance_requirements: PerformanceRequirements,
}

/// Connectivity requirements
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ConnectivityRequirement {
    /// Full connectivity required
    FullyConnected,
    /// Minimum connectivity degree
    MinimumDegree(usize),
    /// Specific topology required
    SpecificTopology(TopologyType),
    /// Custom connectivity pattern
    CustomPattern(Vec<(usize, usize)>),
}

/// Topology types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum TopologyType {
    Linear,
    Grid,
    Heavy,
    Falcon,
    Hummingbird,
    Eagle,
    Custom(String),
}

/// Provider features
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum ProviderFeature {
    QuantumComputing,
    QuantumSimulation,
    NoiseModeling,
    ErrorCorrection,
    MidCircuitMeasurement,
    ParametricCircuits,
    PulseControl,
    RealTimeControl,
    HybridAlgorithms,
    QuantumNetworking,
    Custom(String),
}

/// Performance requirements
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceRequirements {
    /// Maximum execution time
    pub max_execution_time: Option<Duration>,
    /// Minimum throughput (circuits/hour)
    pub min_throughput: Option<f64>,
    /// Maximum queue time
    pub max_queue_time: Option<Duration>,
    /// Minimum availability
    pub min_availability: Option<f64>,
    /// Maximum cost per shot
    pub max_cost_per_shot: Option<f64>,
}

/// Quality thresholds for filtering
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QualityThresholds {
    /// Minimum fidelity
    pub min_fidelity: f64,
    /// Maximum error rate
    pub max_error_rate: f64,
    /// Minimum uptime
    pub min_uptime: f64,
    /// Minimum reliability score
    pub min_reliability: f64,
    /// Minimum performance score
    pub min_performance: f64,
}

/// Geographic restrictions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GeographicRestrictions {
    /// Allowed regions
    pub allowed_regions: HashSet<String>,
    /// Blocked regions
    pub blocked_regions: HashSet<String>,
    /// Data sovereignty requirements
    pub data_sovereignty: bool,
    /// Compliance requirements
    pub compliance_requirements: Vec<ComplianceStandard>,
}

/// Compliance standards
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ComplianceStandard {
    GDPR,
    HIPAA,
    SOC2,
    ISO27001,
    FedRAMP,
    Custom(String),
}

/// Analytics configuration for capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CapabilityAnalyticsConfig {
    /// Enable trend analysis
    pub enable_trend_analysis: bool,
    /// Enable predictive analytics
    pub enable_predictive_analytics: bool,
    /// Enable comparative analysis
    pub enable_comparative_analysis: bool,
    /// Analysis depth
    pub analysis_depth: AnalysisDepth,
    /// Historical data retention
    pub retention_period: Duration,
    /// Statistical confidence level
    pub confidence_level: f64,
}

/// Analysis depth levels
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum AnalysisDepth {
    Basic,
    Standard,
    Advanced,
    Comprehensive,
}

/// Monitoring configuration for capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CapabilityMonitoringConfig {
    /// Enable real-time monitoring
    pub enable_realtime_monitoring: bool,
    /// Monitoring frequency
    pub monitoring_frequency: Duration,
    /// Health check interval
    pub health_check_interval: Duration,
    /// Alert thresholds
    pub alert_thresholds: HashMap<String, f64>,
    /// Enable anomaly detection
    pub enable_anomaly_detection: bool,
    /// Anomaly sensitivity
    pub anomaly_sensitivity: f64,
}

/// Comparison configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComparisonConfig {
    /// Enable automatic comparison
    pub enable_auto_comparison: bool,
    /// Comparison criteria
    pub comparison_criteria: Vec<ComparisonCriterion>,
    /// Ranking algorithms
    pub ranking_algorithms: Vec<RankingAlgorithm>,
    /// Weight distribution
    pub criterion_weights: HashMap<String, f64>,
    /// Enable multi-dimensional analysis
    pub enable_multidimensional_analysis: bool,
}

/// Comparison criteria
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ComparisonCriterion {
    Performance,
    Cost,
    Reliability,
    Availability,
    Features,
    Security,
    Compliance,
    Support,
    Innovation,
    Custom(String),
}

/// Ranking algorithms
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum RankingAlgorithm {
    WeightedSum,
    TOPSIS,
    AHP, // Analytic Hierarchy Process
    ELECTRE,
    PROMETHEE,
    MachineLearning,
    Custom(String),
}

/// Provider information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProviderInfo {
    /// Provider ID
    pub provider_id: String,
    /// Provider name
    pub name: String,
    /// Provider description
    pub description: String,
    /// Provider type
    pub provider_type: ProviderType,
    /// Contact information
    pub contact_info: ContactInfo,
    /// Service endpoints
    pub endpoints: Vec<ServiceEndpoint>,
    /// Supported regions
    pub supported_regions: Vec<String>,
    /// Pricing model
    pub pricing_model: PricingModel,
    /// Terms of service
    pub terms_of_service: Option<String>,
    /// Privacy policy
    pub privacy_policy: Option<String>,
    /// Compliance certifications
    pub compliance_certifications: Vec<ComplianceStandard>,
    /// Last updated
    pub last_updated: SystemTime,
}

/// Provider types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ProviderType {
    /// Cloud-based quantum computing provider
    CloudProvider,
    /// Hardware manufacturer
    HardwareManufacturer,
    /// Software platform
    SoftwarePlatform,
    /// Research institution
    ResearchInstitution,
    /// Service integrator
    ServiceIntegrator,
    /// Custom provider type
    Custom(String),
}

/// Contact information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ContactInfo {
    /// Support email
    pub support_email: Option<String>,
    /// Support phone
    pub support_phone: Option<String>,
    /// Support website
    pub support_website: Option<Url>,
    /// Technical contact
    pub technical_contact: Option<String>,
    /// Business contact
    pub business_contact: Option<String>,
    /// Emergency contact
    pub emergency_contact: Option<String>,
}

/// Service endpoint information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ServiceEndpoint {
    /// Endpoint URL
    pub url: Url,
    /// Endpoint type
    pub endpoint_type: EndpointType,
    /// API version
    pub api_version: String,
    /// Authentication methods
    pub auth_methods: Vec<AuthenticationMethod>,
    /// Rate limits
    pub rate_limits: Option<RateLimits>,
    /// Health status
    pub health_status: EndpointHealth,
    /// Response time statistics
    pub response_time_stats: ResponseTimeStats,
}

/// Endpoint types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum EndpointType {
    REST,
    GraphQL,
    WebSocket,
    GRpc,
    Custom(String),
}

/// Authentication methods
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum AuthenticationMethod {
    APIKey,
    OAuth2,
    JWT,
    BasicAuth,
    Certificate,
    Custom(String),
}

/// Rate limit information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RateLimits {
    /// Requests per minute
    pub requests_per_minute: u32,
    /// Requests per hour
    pub requests_per_hour: u32,
    /// Requests per day
    pub requests_per_day: u32,
    /// Burst limit
    pub burst_limit: u32,
    /// Concurrent requests
    pub concurrent_requests: u32,
}

/// Endpoint health status
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum EndpointHealth {
    Healthy,
    Degraded,
    Unhealthy,
    Unknown,
}

/// Response time statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResponseTimeStats {
    /// Average response time
    pub average_ms: f64,
    /// Median response time
    pub median_ms: f64,
    /// 95th percentile
    pub p95_ms: f64,
    /// 99th percentile
    pub p99_ms: f64,
    /// Standard deviation
    pub std_dev_ms: f64,
}

/// Pricing model information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PricingModel {
    /// Pricing type
    pub pricing_type: PricingType,
    /// Cost per shot
    pub cost_per_shot: Option<f64>,
    /// Cost per circuit
    pub cost_per_circuit: Option<f64>,
    /// Cost per hour
    pub cost_per_hour: Option<f64>,
    /// Monthly subscription
    pub monthly_subscription: Option<f64>,
    /// Free tier limits
    pub free_tier: Option<FreeTierLimits>,
    /// Currency
    pub currency: String,
    /// Billing model
    pub billing_model: BillingModel,
}

/// Pricing types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum PricingType {
    PayPerUse,
    Subscription,
    Hybrid,
    Enterprise,
    Academic,
    Free,
    Custom,
}

/// Free tier limitations
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FreeTierLimits {
    /// Maximum shots per month
    pub max_shots_per_month: Option<u64>,
    /// Maximum circuits per month
    pub max_circuits_per_month: Option<u64>,
    /// Maximum queue time
    pub max_queue_time: Option<Duration>,
    /// Feature limitations
    pub feature_limitations: Vec<String>,
}

/// Billing models
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum BillingModel {
    Prepaid,
    Postpaid,
    Credit,
    Invoice,
    Custom,
}

/// Cached capability information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CachedCapability {
    /// Provider ID
    pub provider_id: String,
    /// Capabilities
    pub capabilities: ProviderCapabilities,
    /// Cache timestamp
    pub cached_at: SystemTime,
    /// Expiration time
    pub expires_at: SystemTime,
    /// Verification status
    pub verification_status: VerificationStatus,
    /// Access count
    pub access_count: u64,
}

/// Comprehensive provider capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProviderCapabilities {
    /// Basic capabilities
    pub basic: BasicCapabilities,
    /// Hardware capabilities
    pub hardware: HardwareCapabilities,
    /// Software capabilities
    pub software: SoftwareCapabilities,
    /// Performance characteristics
    pub performance: PerformanceCapabilities,
    /// Cost characteristics
    pub cost: CostCapabilities,
    /// Security capabilities
    pub security: SecurityCapabilities,
    /// Support capabilities
    pub support: SupportCapabilities,
    /// Advanced features
    pub advanced_features: AdvancedFeatures,
}

/// Basic provider capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BasicCapabilities {
    /// Number of qubits
    pub qubit_count: usize,
    /// Supported gate set
    pub gate_set: HashSet<String>,
    /// Connectivity graph
    pub connectivity: ConnectivityGraph,
    /// Supported measurements
    pub measurement_types: Vec<MeasurementType>,
    /// Classical register size
    pub classical_register_size: usize,
    /// Maximum circuit depth
    pub max_circuit_depth: Option<usize>,
    /// Maximum shots per execution
    pub max_shots: Option<u64>,
}

/// Connectivity graph representation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConnectivityGraph {
    /// Adjacency list
    pub adjacency_list: HashMap<usize, Vec<usize>>,
    /// Edge weights (if applicable)
    pub edge_weights: Option<HashMap<(usize, usize), f64>>,
    /// Topology type
    pub topology_type: TopologyType,
    /// Connectivity metrics
    pub metrics: ConnectivityMetrics,
}

/// Connectivity metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConnectivityMetrics {
    /// Average degree
    pub average_degree: f64,
    /// Clustering coefficient
    pub clustering_coefficient: f64,
    /// Diameter
    pub diameter: usize,
    /// Density
    pub density: f64,
    /// Number of connected components
    pub connected_components: usize,
}

/// Measurement types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum MeasurementType {
    ComputationalBasis,
    Pauli,
    POVM,
    Projective,
    Weak,
    Custom(String),
}

/// Hardware capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HardwareCapabilities {
    /// Quantum volume
    pub quantum_volume: Option<u32>,
    /// Error rates
    pub error_rates: ErrorRates,
    /// Coherence times
    pub coherence_times: CoherenceTimes,
    /// Gate times
    pub gate_times: HashMap<String, Duration>,
    /// Crosstalk characteristics
    pub crosstalk: CrosstalkCharacteristics,
    /// Calibration information
    pub calibration: CalibrationInfo,
    /// Temperature information
    pub temperature: Option<f64>,
    /// Noise characteristics
    pub noise_characteristics: NoiseCharacteristics,
}

/// Error rate information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ErrorRates {
    /// Single-qubit gate error rates
    pub single_qubit_gates: HashMap<String, f64>,
    /// Two-qubit gate error rates
    pub two_qubit_gates: HashMap<String, f64>,
    /// Readout error rates
    pub readout_errors: HashMap<usize, f64>,
    /// Average error rate
    pub average_error_rate: f64,
    /// Error rate variance
    pub error_rate_variance: f64,
}

/// Coherence time information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CoherenceTimes {
    /// T1 relaxation times per qubit
    pub t1_times: HashMap<usize, Duration>,
    /// T2 dephasing times per qubit
    pub t2_times: HashMap<usize, Duration>,
    /// Average T1 time
    pub average_t1: Duration,
    /// Average T2 time
    pub average_t2: Duration,
}

/// Crosstalk characteristics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CrosstalkCharacteristics {
    /// Crosstalk matrix
    pub crosstalk_matrix: Array2<f64>,
    /// Spectral crosstalk
    pub spectral_crosstalk: HashMap<String, f64>,
    /// Temporal crosstalk
    pub temporal_crosstalk: HashMap<String, f64>,
    /// Mitigation strategies available
    pub mitigation_strategies: Vec<String>,
}

/// Calibration information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CalibrationInfo {
    /// Last calibration time
    pub last_calibration: SystemTime,
    /// Calibration frequency
    pub calibration_frequency: Duration,
    /// Calibration quality score
    pub quality_score: f64,
    /// Drift rate
    pub drift_rate: f64,
    /// Calibration method
    pub calibration_method: String,
}

/// Noise characteristics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NoiseCharacteristics {
    /// Noise model type
    pub noise_model_type: String,
    /// Noise parameters
    pub noise_parameters: HashMap<String, f64>,
    /// Noise correlations
    pub noise_correlations: Array2<f64>,
    /// Environmental noise factors
    pub environmental_factors: HashMap<String, f64>,
}

/// Software capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SoftwareCapabilities {
    /// Supported frameworks
    pub supported_frameworks: Vec<QuantumFramework>,
    /// Programming languages
    pub programming_languages: Vec<String>,
    /// Compilation features
    pub compilation_features: CompilationFeatures,
    /// Optimization features
    pub optimization_features: OptimizationFeatures,
    /// Simulation capabilities
    pub simulation_capabilities: SimulationCapabilities,
    /// Integration capabilities
    pub integration_capabilities: IntegrationCapabilities,
}

/// Quantum frameworks
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum QuantumFramework {
    Qiskit,
    Cirq,
    QSharp,
    Braket,
    Pennylane,
    Strawberry,
    Tket,
    Forest,
    ProjectQ,
    Custom(String),
}

/// Compilation features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompilationFeatures {
    /// Circuit optimization
    pub circuit_optimization: bool,
    /// Gate synthesis
    pub gate_synthesis: bool,
    /// Routing algorithms
    pub routing_algorithms: Vec<String>,
    /// Transpilation passes
    pub transpilation_passes: Vec<String>,
    /// Custom compilation
    pub custom_compilation: bool,
}

/// Optimization features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizationFeatures {
    /// Parameter optimization
    pub parameter_optimization: bool,
    /// Circuit depth optimization
    pub depth_optimization: bool,
    /// Gate count optimization
    pub gate_count_optimization: bool,
    /// Noise-aware optimization
    pub noise_aware_optimization: bool,
    /// Variational algorithms
    pub variational_algorithms: Vec<String>,
}

/// Simulation capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SimulationCapabilities {
    /// Classical simulation
    pub classical_simulation: bool,
    /// Noise simulation
    pub noise_simulation: bool,
    /// Error simulation
    pub error_simulation: bool,
    /// Maximum simulated qubits
    pub max_simulated_qubits: Option<usize>,
    /// Simulation backends
    pub simulation_backends: Vec<String>,
}

/// Integration capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntegrationCapabilities {
    /// REST API
    pub rest_api: bool,
    /// GraphQL API
    pub graphql_api: bool,
    /// WebSocket support
    pub websocket_support: bool,
    /// SDK availability
    pub sdk_languages: Vec<String>,
    /// Third-party integrations
    pub third_party_integrations: Vec<String>,
}

/// Performance capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceCapabilities {
    /// Throughput metrics
    pub throughput: ThroughputMetrics,
    /// Latency metrics
    pub latency: LatencyMetrics,
    /// Availability metrics
    pub availability: AvailabilityMetrics,
    /// Scalability characteristics
    pub scalability: ScalabilityCharacteristics,
    /// Resource utilization
    pub resource_utilization: ResourceUtilizationMetrics,
}

/// Throughput metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ThroughputMetrics {
    /// Circuits per hour
    pub circuits_per_hour: f64,
    /// Shots per second
    pub shots_per_second: f64,
    /// Jobs per day
    pub jobs_per_day: f64,
    /// Peak throughput
    pub peak_throughput: f64,
    /// Sustained throughput
    pub sustained_throughput: f64,
}

/// Latency metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LatencyMetrics {
    /// Job submission latency
    pub submission_latency: Duration,
    /// Queue wait time
    pub queue_wait_time: Duration,
    /// Execution time
    pub execution_time: Duration,
    /// Result retrieval time
    pub result_retrieval_time: Duration,
    /// Total turnaround time
    pub total_turnaround_time: Duration,
}

/// Availability metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AvailabilityMetrics {
    /// Uptime percentage
    pub uptime_percentage: f64,
    /// Mean time between failures
    pub mtbf: Duration,
    /// Mean time to recovery
    pub mttr: Duration,
    /// Maintenance windows
    pub maintenance_windows: Vec<MaintenanceWindow>,
    /// Service level agreement
    pub sla: Option<ServiceLevelAgreement>,
}

/// Maintenance window information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MaintenanceWindow {
    /// Start time
    pub start_time: SystemTime,
    /// Duration
    pub duration: Duration,
    /// Frequency
    pub frequency: MaintenanceFrequency,
    /// Impact level
    pub impact_level: ImpactLevel,
    /// Description
    pub description: String,
}

/// Maintenance frequency
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum MaintenanceFrequency {
    Daily,
    Weekly,
    Monthly,
    Quarterly,
    Annually,
    AsNeeded,
}

/// Impact levels
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ImpactLevel {
    None,
    Low,
    Medium,
    High,
    Critical,
}

/// Service level agreement
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ServiceLevelAgreement {
    /// Guaranteed uptime
    pub guaranteed_uptime: f64,
    /// Maximum response time
    pub max_response_time: Duration,
    /// Support response time
    pub support_response_time: Duration,
    /// Resolution time
    pub resolution_time: Duration,
    /// Penalty clauses
    pub penalty_clauses: Vec<String>,
}

/// Scalability characteristics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ScalabilityCharacteristics {
    /// Horizontal scalability
    pub horizontal_scalability: bool,
    /// Vertical scalability
    pub vertical_scalability: bool,
    /// Auto-scaling support
    pub auto_scaling: bool,
    /// Maximum concurrent jobs
    pub max_concurrent_jobs: Option<u32>,
    /// Load balancing
    pub load_balancing: bool,
}

/// Resource utilization metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResourceUtilizationMetrics {
    /// CPU utilization
    pub cpu_utilization: f64,
    /// Memory utilization
    pub memory_utilization: f64,
    /// Network utilization
    pub network_utilization: f64,
    /// Storage utilization
    pub storage_utilization: f64,
    /// Quantum resource utilization
    pub quantum_utilization: f64,
}

/// Cost capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CostCapabilities {
    /// Cost model
    pub cost_model: CostModel,
    /// Cost optimization features
    pub cost_optimization: CostOptimizationFeatures,
    /// Budget management
    pub budget_management: BudgetManagementFeatures,
    /// Cost transparency
    pub cost_transparency: CostTransparencyFeatures,
}

/// Cost model information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CostModel {
    /// Pricing structure
    pub pricing_structure: PricingStructure,
    /// Cost factors
    pub cost_factors: Vec<CostFactor>,
    /// Volume discounts
    pub volume_discounts: Vec<VolumeDiscount>,
    /// Regional pricing
    pub regional_pricing: HashMap<String, f64>,
    /// Currency support
    pub supported_currencies: Vec<String>,
}

/// Pricing structure
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum PricingStructure {
    Fixed,
    Variable,
    Tiered,
    Usage,
    Hybrid,
    Negotiated,
}

/// Cost factors
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CostFactor {
    /// Factor name
    pub name: String,
    /// Factor type
    pub factor_type: CostFactorType,
    /// Unit cost
    pub unit_cost: f64,
    /// Minimum charge
    pub minimum_charge: Option<f64>,
    /// Maximum charge
    pub maximum_charge: Option<f64>,
}

/// Cost factor types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum CostFactorType {
    PerShot,
    PerCircuit,
    PerMinute,
    PerHour,
    PerQubit,
    PerGate,
    PerJob,
    Fixed,
}

/// Volume discount information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VolumeDiscount {
    /// Minimum volume
    pub min_volume: u64,
    /// Discount percentage
    pub discount_percentage: f64,
    /// Discount type
    pub discount_type: DiscountType,
}

/// Discount types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum DiscountType {
    Percentage,
    Fixed,
    Tiered,
    Progressive,
}

/// Cost optimization features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CostOptimizationFeatures {
    /// Cost estimation
    pub cost_estimation: bool,
    /// Cost tracking
    pub cost_tracking: bool,
    /// Budget alerts
    pub budget_alerts: bool,
    /// Cost optimization recommendations
    pub optimization_recommendations: bool,
    /// Spot pricing
    pub spot_pricing: bool,
}

/// Budget management features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BudgetManagementFeatures {
    /// Budget setting
    pub budget_setting: bool,
    /// Budget monitoring
    pub budget_monitoring: bool,
    /// Spending limits
    pub spending_limits: bool,
    /// Cost allocation
    pub cost_allocation: bool,
    /// Invoice management
    pub invoice_management: bool,
}

/// Cost transparency features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CostTransparencyFeatures {
    /// Real-time cost display
    pub realtime_cost_display: bool,
    /// Detailed cost breakdown
    pub detailed_breakdown: bool,
    /// Historical cost analysis
    pub historical_analysis: bool,
    /// Cost comparison tools
    pub comparison_tools: bool,
    /// Cost reporting
    pub cost_reporting: bool,
}

/// Security capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityCapabilities {
    /// Authentication methods
    pub authentication: Vec<AuthenticationMethod>,
    /// Authorization models
    pub authorization: Vec<AuthorizationModel>,
    /// Encryption capabilities
    pub encryption: EncryptionCapabilities,
    /// Compliance certifications
    pub compliance: Vec<ComplianceStandard>,
    /// Security monitoring
    pub security_monitoring: SecurityMonitoringCapabilities,
}

/// Authorization models
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum AuthorizationModel {
    RBAC, // Role-Based Access Control
    ABAC, // Attribute-Based Access Control
    ACL,  // Access Control List
    MAC,  // Mandatory Access Control
    DAC,  // Discretionary Access Control
    Custom(String),
}

/// Encryption capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EncryptionCapabilities {
    /// Data at rest encryption
    pub data_at_rest: bool,
    /// Data in transit encryption
    pub data_in_transit: bool,
    /// End-to-end encryption
    pub end_to_end: bool,
    /// Encryption algorithms
    pub algorithms: Vec<String>,
    /// Key management
    pub key_management: KeyManagementCapabilities,
}

/// Key management capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct KeyManagementCapabilities {
    /// Customer-managed keys
    pub customer_managed_keys: bool,
    /// Hardware security modules
    pub hsm_support: bool,
    /// Key rotation
    pub key_rotation: bool,
    /// Key escrow
    pub key_escrow: bool,
    /// Multi-party computation
    pub mpc_support: bool,
}

/// Security monitoring capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityMonitoringCapabilities {
    /// Audit logging
    pub audit_logging: bool,
    /// Intrusion detection
    pub intrusion_detection: bool,
    /// Anomaly detection
    pub anomaly_detection: bool,
    /// Security alerts
    pub security_alerts: bool,
    /// Threat intelligence
    pub threat_intelligence: bool,
}

/// Support capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SupportCapabilities {
    /// Support channels
    pub support_channels: Vec<SupportChannel>,
    /// Support hours
    pub support_hours: SupportHours,
    /// Response times
    pub response_times: ResponseTimeGuarantees,
    /// Documentation quality
    pub documentation_quality: DocumentationQuality,
    /// Training and education
    pub training_education: TrainingEducationCapabilities,
}

/// Support channels
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum SupportChannel {
    Email,
    Phone,
    Chat,
    Forum,
    Documentation,
    VideoCall,
    OnSite,
    Custom(String),
}

/// Support hours
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SupportHours {
    /// Business hours support
    pub business_hours: bool,
    /// 24/7 support
    pub twenty_four_seven: bool,
    /// Weekend support
    pub weekend_support: bool,
    /// Holiday support
    pub holiday_support: bool,
    /// Timezone coverage
    pub timezone_coverage: Vec<String>,
}

/// Response time guarantees
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResponseTimeGuarantees {
    /// Critical issues
    pub critical_response_time: Duration,
    /// High priority issues
    pub high_priority_response_time: Duration,
    /// Medium priority issues
    pub medium_priority_response_time: Duration,
    /// Low priority issues
    pub low_priority_response_time: Duration,
    /// First response time
    pub first_response_time: Duration,
}

/// Documentation quality assessment
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DocumentationQuality {
    /// Completeness score
    pub completeness_score: f64,
    /// Accuracy score
    pub accuracy_score: f64,
    /// Clarity score
    pub clarity_score: f64,
    /// Up-to-date score
    pub up_to_date_score: f64,
    /// Example quality
    pub example_quality: f64,
}

/// Training and education capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrainingEducationCapabilities {
    /// Online courses
    pub online_courses: bool,
    /// Workshops
    pub workshops: bool,
    /// Certification programs
    pub certification_programs: bool,
    /// Consulting services
    pub consulting_services: bool,
    /// Community forums
    pub community_forums: bool,
}

/// Advanced features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AdvancedFeatures {
    /// Machine learning integration
    pub ml_integration: MLIntegrationFeatures,
    /// Hybrid computing
    pub hybrid_computing: HybridComputingFeatures,
    /// Quantum networking
    pub quantum_networking: QuantumNetworkingFeatures,
    /// Research capabilities
    pub research_capabilities: ResearchCapabilities,
    /// Experimental features
    pub experimental_features: Vec<String>,
}

/// ML integration features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MLIntegrationFeatures {
    /// Quantum machine learning
    pub quantum_ml: bool,
    /// Classical ML integration
    pub classical_ml_integration: bool,
    /// AutoML support
    pub automl_support: bool,
    /// Supported ML frameworks
    pub ml_frameworks: Vec<String>,
    /// GPU acceleration
    pub gpu_acceleration: bool,
}

/// Hybrid computing features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HybridComputingFeatures {
    /// Classical-quantum integration
    pub classical_quantum_integration: bool,
    /// Real-time feedback
    pub realtime_feedback: bool,
    /// Iterative algorithms
    pub iterative_algorithms: bool,
    /// HPC integration
    pub hpc_integration: bool,
    /// Edge computing
    pub edge_computing: bool,
}

/// Quantum networking features
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QuantumNetworkingFeatures {
    /// Quantum internet support
    pub quantum_internet: bool,
    /// Quantum key distribution
    pub qkd_support: bool,
    /// Distributed quantum computing
    pub distributed_computing: bool,
    /// Quantum teleportation
    pub quantum_teleportation: bool,
    /// Network protocols
    pub network_protocols: Vec<String>,
}

/// Research capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResearchCapabilities {
    /// Research partnerships
    pub research_partnerships: bool,
    /// Academic pricing
    pub academic_pricing: bool,
    /// Research tools
    pub research_tools: bool,
    /// Data sharing capabilities
    pub data_sharing: bool,
    /// Publication support
    pub publication_support: bool,
}

/// Verification status
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum VerificationStatus {
    Verified,
    PartiallyVerified,
    Unverified,
    Failed,
    Pending,
}

/// Discovery events
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DiscoveryEvent {
    ProviderDiscovered {
        provider_id: String,
        capabilities: ProviderCapabilities,
        timestamp: SystemTime,
    },
    CapabilityUpdated {
        provider_id: String,
        updated_capabilities: ProviderCapabilities,
        timestamp: SystemTime,
    },
    ProviderUnavailable {
        provider_id: String,
        reason: String,
        timestamp: SystemTime,
    },
    VerificationCompleted {
        provider_id: String,
        status: VerificationStatus,
        timestamp: SystemTime,
    },
    ComparisonCompleted {
        providers: Vec<String>,
        results: ComparisonResults,
        timestamp: SystemTime,
    },
}

/// Discovery commands
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum DiscoveryCommand {
    DiscoverProviders,
    VerifyProvider(String),
    UpdateCapabilities(String),
    CompareProviders(Vec<String>),
    FilterProviders(FilteringConfig),
    GetProviderInfo(String),
    GetProviderRanking(Vec<ComparisonCriterion>),
    GenerateReport(ReportType),
}

/// Report types for discovery
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ReportType {
    ProviderSummary,
    CapabilityMatrix,
    PerformanceComparison,
    CostAnalysis,
    SecurityAssessment,
    ComprehensiveReport,
}

/// Comparison results
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComparisonResults {
    /// Provider rankings
    pub rankings: Vec<ProviderRanking>,
    /// Comparison matrix
    pub comparison_matrix: HashMap<String, HashMap<String, f64>>,
    /// Analysis summary
    pub analysis_summary: AnalysisSummary,
    /// Recommendations
    pub recommendations: Vec<ProviderRecommendation>,
}

/// Provider ranking
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProviderRanking {
    /// Provider ID
    pub provider_id: String,
    /// Overall score
    pub overall_score: f64,
    /// Category scores
    pub category_scores: HashMap<String, f64>,
    /// Rank position
    pub rank: usize,
    /// Strengths
    pub strengths: Vec<String>,
    /// Weaknesses
    pub weaknesses: Vec<String>,
}

/// Analysis summary
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnalysisSummary {
    /// Key findings
    pub key_findings: Vec<String>,
    /// Market insights
    pub market_insights: Vec<String>,
    /// Trends identified
    pub trends: Vec<String>,
    /// Risk factors
    pub risk_factors: Vec<String>,
}

/// Provider recommendation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProviderRecommendation {
    /// Provider ID
    pub provider_id: String,
    /// Recommendation type
    pub recommendation_type: RecommendationType,
    /// Use case
    pub use_case: String,
    /// Confidence score
    pub confidence: f64,
    /// Reasoning
    pub reasoning: String,
    /// Cost estimate
    pub cost_estimate: Option<CostEstimate>,
}

/// Recommendation types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum RecommendationType {
    BestOverall,
    BestValue,
    BestPerformance,
    BestSecurity,
    BestSupport,
    BestForBeginners,
    BestForResearch,
    BestForProduction,
    Custom(String),
}

/// Cost estimate
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CostEstimate {
    /// Estimated monthly cost
    pub monthly_cost: f64,
    /// Cost breakdown
    pub cost_breakdown: HashMap<String, f64>,
    /// Currency
    pub currency: String,
    /// Confidence level
    pub confidence: f64,
}

// Implementation structures for internal engines

/// Capability discovery engine
pub struct CapabilityDiscoveryEngine {
    discovery_strategies: Vec<Box<dyn DiscoveryStrategyImpl + Send + Sync>>,
    verification_engine: VerificationEngine,
    discovery_cache: HashMap<String, SystemTime>,
}

/// Capability analytics engine
pub struct CapabilityAnalytics {
    analytics_config: CapabilityAnalyticsConfig,
    historical_data: Vec<CapabilitySnapshot>,
    trend_analyzers: HashMap<String, TrendAnalyzer>,
    predictive_models: HashMap<String, PredictiveModel>,
}

/// Provider comparison engine
pub struct ProviderComparisonEngine {
    comparison_config: ComparisonConfig,
    ranking_algorithms: HashMap<String, Box<dyn RankingAlgorithmImpl + Send + Sync>>,
    comparison_cache: HashMap<String, ComparisonResults>,
}

/// Capability monitoring system
pub struct CapabilityMonitor {
    monitoring_config: CapabilityMonitoringConfig,
    monitoring_targets: HashMap<String, MonitoringTarget>,
    health_status: HashMap<String, ProviderHealthStatus>,
    anomaly_detectors: HashMap<String, AnomalyDetector>,
}

/// Provider health status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProviderHealthStatus {
    /// Overall health
    pub overall_health: HealthLevel,
    /// Individual component health
    pub component_health: HashMap<String, HealthLevel>,
    /// Last health check
    pub last_check: SystemTime,
    /// Health score
    pub health_score: f64,
    /// Issues detected
    pub issues: Vec<HealthIssue>,
}

/// Health levels
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum HealthLevel {
    Excellent,
    Good,
    Fair,
    Poor,
    Critical,
    Unknown,
}

/// Health issues
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthIssue {
    /// Issue type
    pub issue_type: IssueType,
    /// Severity
    pub severity: IssueSeverity,
    /// Description
    pub description: String,
    /// Detected at
    pub detected_at: SystemTime,
    /// Resolution status
    pub resolution_status: ResolutionStatus,
}

/// Issue types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum IssueType {
    Performance,
    Availability,
    Security,
    Compliance,
    Cost,
    Support,
    Documentation,
    Integration,
    Custom(String),
}

/// Issue severity
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum IssueSeverity {
    Low,
    Medium,
    High,
    Critical,
}

/// Resolution status
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum ResolutionStatus {
    Open,
    InProgress,
    Resolved,
    Closed,
    Escalated,
}

/// Capability snapshot for analytics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CapabilitySnapshot {
    /// Provider ID
    pub provider_id: String,
    /// Timestamp
    pub timestamp: SystemTime,
    /// Capabilities
    pub capabilities: ProviderCapabilities,
    /// Performance metrics
    pub performance_metrics: HashMap<String, f64>,
    /// Health status
    pub health_status: ProviderHealthStatus,
}

/// Trend analyzer
pub struct TrendAnalyzer {
    analysis_window: Duration,
    data_points: Vec<DataPoint>,
    trend_model: TrendModel,
}

/// Data point for trend analysis
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DataPoint {
    /// Timestamp
    pub timestamp: SystemTime,
    /// Value
    pub value: f64,
    /// Metadata
    pub metadata: HashMap<String, String>,
}

/// Trend model
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrendModel {
    /// Model type
    pub model_type: TrendModelType,
    /// Model parameters
    pub parameters: HashMap<String, f64>,
    /// Accuracy metrics
    pub accuracy: f64,
    /// Last updated
    pub last_updated: SystemTime,
}

/// Trend model types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum TrendModelType {
    Linear,
    Exponential,
    Polynomial,
    Seasonal,
    ARIMA,
    MachineLearning,
}

/// Predictive model
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PredictiveModel {
    /// Model type
    pub model_type: PredictiveModelType,
    /// Features
    pub features: Vec<String>,
    /// Model parameters
    pub parameters: Array1<f64>,
    /// Accuracy metrics
    pub accuracy_metrics: AccuracyMetrics,
    /// Prediction horizon
    pub prediction_horizon: Duration,
}

/// Predictive model types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum PredictiveModelType {
    LinearRegression,
    RandomForest,
    NeuralNetwork,
    SVM,
    DecisionTree,
    Ensemble,
}

/// Accuracy metrics for models
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AccuracyMetrics {
    /// Mean absolute error
    pub mae: f64,
    /// Root mean square error
    pub rmse: f64,
    /// R-squared
    pub r_squared: f64,
    /// Mean absolute percentage error
    pub mape: f64,
}

/// Monitoring target information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MonitoringTarget {
    /// Target ID
    pub target_id: String,
    /// Target type
    pub target_type: MonitoringTargetType,
    /// Monitoring frequency
    pub frequency: Duration,
    /// Health check configuration
    pub health_check_config: HealthCheckConfig,
    /// Alert thresholds
    pub alert_thresholds: HashMap<String, f64>,
}

/// Monitoring target types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum MonitoringTargetType {
    Provider,
    Endpoint,
    Service,
    Capability,
    Performance,
    Cost,
    Security,
}

/// Health check configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthCheckConfig {
    /// Check type
    pub check_type: HealthCheckType,
    /// Check interval
    pub check_interval: Duration,
    /// Timeout
    pub timeout: Duration,
    /// Expected response
    pub expected_response: Option<String>,
    /// Failure threshold
    pub failure_threshold: u32,
}

/// Health check types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum HealthCheckType {
    HTTP,
    TCP,
    Ping,
    API,
    Custom(String),
}

/// Anomaly detector for monitoring
pub struct AnomalyDetector {
    detector_type: AnomalyDetectorType,
    detection_window: Duration,
    sensitivity: f64,
    baseline_data: Vec<f64>,
    anomaly_threshold: f64,
}

/// Anomaly detector types
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub enum AnomalyDetectorType {
    Statistical,
    MachineLearning,
    Threshold,
    Pattern,
    Seasonal,
}

/// Verification engine
pub struct VerificationEngine {
    verification_strategies: Vec<Box<dyn VerificationStrategyImpl + Send + Sync>>,
    verification_cache: HashMap<String, VerificationResult>,
}

/// Verification result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VerificationResult {
    /// Verification status
    pub status: VerificationStatus,
    /// Confidence score
    pub confidence: f64,
    /// Verification details
    pub details: HashMap<String, String>,
    /// Verified at
    pub verified_at: SystemTime,
    /// Verification method
    pub verification_method: String,
}

// Trait definitions for implementation strategies

/// Discovery strategy implementation trait
pub trait DiscoveryStrategyImpl: Send + Sync {
    /// Execute discovery
    fn discover(&self) -> DeviceResult<Vec<ProviderInfo>>;

    /// Get strategy name
    fn name(&self) -> &str;

    /// Check if strategy is available
    fn is_available(&self) -> bool;
}

/// Verification strategy implementation trait
pub trait VerificationStrategyImpl: Send + Sync {
    /// Verify provider capabilities
    fn verify(
        &self,
        provider_id: &str,
        capabilities: &ProviderCapabilities,
    ) -> DeviceResult<VerificationResult>;

    /// Get strategy name
    fn name(&self) -> &str;
}

/// Ranking algorithm implementation trait
pub trait RankingAlgorithmImpl: Send + Sync {
    /// Rank providers
    fn rank(
        &self,
        providers: &[ProviderInfo],
        criteria: &[ComparisonCriterion],
    ) -> DeviceResult<Vec<ProviderRanking>>;

    /// Get algorithm name
    fn name(&self) -> &str;
}

impl Default for DiscoveryConfig {
    fn default() -> Self {
        Self {
            enable_auto_discovery: true,
            discovery_interval: 3600, // 1 hour
            enable_caching: true,
            cache_expiration: Duration::from_secs(86400), // 24 hours
            enable_monitoring: true,
            enable_analytics: true,
            discovery_strategies: vec![
                DiscoveryStrategy::APIDiscovery,
                DiscoveryStrategy::RegistryDiscovery,
            ],
            verification_config: VerificationConfig {
                enable_verification: true,
                verification_timeout: Duration::from_secs(300),
                verification_strategies: vec![
                    VerificationStrategy::EndpointTesting,
                    VerificationStrategy::CapabilityProbing,
                ],
                min_verification_confidence: 0.8,
                enable_continuous_verification: true,
                verification_frequency: Duration::from_secs(86400),
            },
            filtering_config: FilteringConfig {
                enable_filtering: true,
                min_requirements: CapabilityRequirements {
                    min_qubits: Some(2),
                    max_error_rate: Some(0.1),
                    required_gates: HashSet::new(),
                    required_connectivity: None,
                    required_features: HashSet::new(),
                    performance_requirements: PerformanceRequirements {
                        max_execution_time: None,
                        min_throughput: None,
                        max_queue_time: None,
                        min_availability: Some(0.9),
                        max_cost_per_shot: None,
                    },
                },
                excluded_providers: HashSet::new(),
                preferred_providers: Vec::new(),
                quality_thresholds: QualityThresholds {
                    min_fidelity: 0.8,
                    max_error_rate: 0.1,
                    min_uptime: 0.95,
                    min_reliability: 0.9,
                    min_performance: 0.7,
                },
                geographic_restrictions: None,
            },
            analytics_config: CapabilityAnalyticsConfig {
                enable_trend_analysis: true,
                enable_predictive_analytics: true,
                enable_comparative_analysis: true,
                analysis_depth: AnalysisDepth::Standard,
                retention_period: Duration::from_secs(30 * 86400), // 30 days
                confidence_level: 0.95,
            },
            monitoring_config: CapabilityMonitoringConfig {
                enable_realtime_monitoring: true,
                monitoring_frequency: Duration::from_secs(300), // 5 minutes
                health_check_interval: Duration::from_secs(600), // 10 minutes
                alert_thresholds: HashMap::new(),
                enable_anomaly_detection: true,
                anomaly_sensitivity: 0.8,
            },
            comparison_config: ComparisonConfig {
                enable_auto_comparison: true,
                comparison_criteria: vec![
                    ComparisonCriterion::Performance,
                    ComparisonCriterion::Cost,
                    ComparisonCriterion::Reliability,
                ],
                ranking_algorithms: vec![RankingAlgorithm::WeightedSum],
                criterion_weights: HashMap::new(),
                enable_multidimensional_analysis: true,
            },
        }
    }
}

impl ProviderCapabilityDiscoverySystem {
    /// Create a new provider capability discovery system
    pub fn new(config: DiscoveryConfig) -> Self {
        let (event_sender, _) = broadcast::channel(1000);
        let (command_sender, command_receiver) = mpsc::unbounded_channel();

        Self {
            config: config.clone(),
            providers: Arc::new(RwLock::new(HashMap::new())),
            capability_cache: Arc::new(RwLock::new(HashMap::new())),
            discovery_engine: Arc::new(RwLock::new(CapabilityDiscoveryEngine::new())),
            analytics: Arc::new(RwLock::new(CapabilityAnalytics::new(
                config.analytics_config.clone(),
            ))),
            comparison_engine: Arc::new(RwLock::new(ProviderComparisonEngine::new(
                config.comparison_config.clone(),
            ))),
            monitor: Arc::new(RwLock::new(CapabilityMonitor::new(
                config.monitoring_config,
            ))),
            event_sender,
            command_receiver: Arc::new(Mutex::new(command_receiver)),
        }
    }

    /// Start the discovery system
    pub async fn start(&self) -> DeviceResult<()> {
        if self.config.enable_auto_discovery {
            self.start_auto_discovery().await?;
        }

        if self.config.enable_monitoring {
            self.start_monitoring().await?;
        }

        if self.config.enable_analytics {
            self.start_analytics().await?;
        }

        Ok(())
    }

    /// Discover available providers
    pub async fn discover_providers(&self) -> DeviceResult<Vec<ProviderInfo>> {
        let discovery_engine = self
            .discovery_engine
            .read()
            .unwrap_or_else(|e| e.into_inner());
        discovery_engine.discover_providers().await
    }

    /// Get provider capabilities
    pub async fn get_provider_capabilities(
        &self,
        provider_id: &str,
    ) -> DeviceResult<Option<ProviderCapabilities>> {
        // Check cache first
        {
            let cache = self
                .capability_cache
                .read()
                .unwrap_or_else(|e| e.into_inner());
            if let Some(cached) = cache.get(provider_id) {
                if cached.expires_at > SystemTime::now() {
                    return Ok(Some(cached.capabilities.clone()));
                }
            }
        }

        // Discover and cache capabilities
        let capabilities = self.discover_provider_capabilities(provider_id).await?;
        if let Some(caps) = &capabilities {
            self.cache_capabilities(provider_id, caps.clone()).await?;
        }

        Ok(capabilities)
    }

    /// Compare providers
    pub async fn compare_providers(
        &self,
        provider_ids: &[String],
        criteria: &[ComparisonCriterion],
    ) -> DeviceResult<ComparisonResults> {
        let comparison_engine = self
            .comparison_engine
            .read()
            .unwrap_or_else(|e| e.into_inner());
        comparison_engine
            .compare_providers(provider_ids, criteria)
            .await
    }

    /// Get provider recommendations
    pub async fn get_recommendations(
        &self,
        requirements: &CapabilityRequirements,
    ) -> DeviceResult<Vec<ProviderRecommendation>> {
        let providers = self.discover_providers().await?;
        let filtered_providers = self.filter_providers(&providers, requirements)?;
        let recommendations = self
            .generate_recommendations(&filtered_providers, requirements)
            .await?;
        Ok(recommendations)
    }

    // Private implementation methods

    async fn start_auto_discovery(&self) -> DeviceResult<()> {
        // Implementation would start background discovery task
        Ok(())
    }

    async fn start_monitoring(&self) -> DeviceResult<()> {
        // Implementation would start background monitoring task
        Ok(())
    }

    async fn start_analytics(&self) -> DeviceResult<()> {
        // Implementation would start background analytics task
        Ok(())
    }

    async fn discover_provider_capabilities(
        &self,
        provider_id: &str,
    ) -> DeviceResult<Option<ProviderCapabilities>> {
        // Implementation would discover actual capabilities
        // For now, return a mock capability
        Ok(Some(ProviderCapabilities {
            basic: BasicCapabilities {
                qubit_count: 5,
                gate_set: ["H", "CNOT", "RZ"].iter().map(|s| s.to_string()).collect(),
                connectivity: ConnectivityGraph {
                    adjacency_list: HashMap::new(),
                    edge_weights: None,
                    topology_type: TopologyType::Linear,
                    metrics: ConnectivityMetrics {
                        average_degree: 2.0,
                        clustering_coefficient: 0.0,
                        diameter: 4,
                        density: 0.4,
                        connected_components: 1,
                    },
                },
                measurement_types: vec![MeasurementType::ComputationalBasis],
                classical_register_size: 5,
                max_circuit_depth: Some(1000),
                max_shots: Some(8192),
            },
            hardware: HardwareCapabilities {
                quantum_volume: Some(32),
                error_rates: ErrorRates {
                    single_qubit_gates: HashMap::new(),
                    two_qubit_gates: HashMap::new(),
                    readout_errors: HashMap::new(),
                    average_error_rate: 0.01,
                    error_rate_variance: 0.001,
                },
                coherence_times: CoherenceTimes {
                    t1_times: HashMap::new(),
                    t2_times: HashMap::new(),
                    average_t1: Duration::from_micros(100),
                    average_t2: Duration::from_micros(50),
                },
                gate_times: HashMap::new(),
                crosstalk: CrosstalkCharacteristics {
                    crosstalk_matrix: Array2::zeros((5, 5)),
                    spectral_crosstalk: HashMap::new(),
                    temporal_crosstalk: HashMap::new(),
                    mitigation_strategies: Vec::new(),
                },
                calibration: CalibrationInfo {
                    last_calibration: SystemTime::now(),
                    calibration_frequency: Duration::from_secs(86400),
                    quality_score: 0.95,
                    drift_rate: 0.01,
                    calibration_method: "standard".to_string(),
                },
                temperature: Some(0.01),
                noise_characteristics: NoiseCharacteristics {
                    noise_model_type: "depolarizing".to_string(),
                    noise_parameters: HashMap::new(),
                    noise_correlations: Array2::zeros((5, 5)),
                    environmental_factors: HashMap::new(),
                },
            },
            software: SoftwareCapabilities {
                supported_frameworks: vec![QuantumFramework::Qiskit],
                programming_languages: vec!["Python".to_string()],
                compilation_features: CompilationFeatures {
                    circuit_optimization: true,
                    gate_synthesis: true,
                    routing_algorithms: vec!["basic".to_string()],
                    transpilation_passes: vec!["optimization".to_string()],
                    custom_compilation: false,
                },
                optimization_features: OptimizationFeatures {
                    parameter_optimization: true,
                    depth_optimization: true,
                    gate_count_optimization: true,
                    noise_aware_optimization: false,
                    variational_algorithms: vec!["VQE".to_string()],
                },
                simulation_capabilities: SimulationCapabilities {
                    classical_simulation: true,
                    noise_simulation: true,
                    error_simulation: false,
                    max_simulated_qubits: Some(20),
                    simulation_backends: vec!["statevector".to_string()],
                },
                integration_capabilities: IntegrationCapabilities {
                    rest_api: true,
                    graphql_api: false,
                    websocket_support: false,
                    sdk_languages: vec!["Python".to_string()],
                    third_party_integrations: Vec::new(),
                },
            },
            performance: PerformanceCapabilities {
                throughput: ThroughputMetrics {
                    circuits_per_hour: 100.0,
                    shots_per_second: 1000.0,
                    jobs_per_day: 2000.0,
                    peak_throughput: 150.0,
                    sustained_throughput: 80.0,
                },
                latency: LatencyMetrics {
                    submission_latency: Duration::from_millis(100),
                    queue_wait_time: Duration::from_secs(60),
                    execution_time: Duration::from_millis(500),
                    result_retrieval_time: Duration::from_millis(50),
                    total_turnaround_time: Duration::from_secs(61),
                },
                availability: AvailabilityMetrics {
                    uptime_percentage: 99.5,
                    mtbf: Duration::from_secs(30 * 86400),
                    mttr: Duration::from_secs(3600),
                    maintenance_windows: Vec::new(),
                    sla: None,
                },
                scalability: ScalabilityCharacteristics {
                    horizontal_scalability: false,
                    vertical_scalability: true,
                    auto_scaling: false,
                    max_concurrent_jobs: Some(10),
                    load_balancing: false,
                },
                resource_utilization: ResourceUtilizationMetrics {
                    cpu_utilization: 0.7,
                    memory_utilization: 0.6,
                    network_utilization: 0.3,
                    storage_utilization: 0.4,
                    quantum_utilization: 0.8,
                },
            },
            cost: CostCapabilities {
                cost_model: CostModel {
                    pricing_structure: PricingStructure::Variable,
                    cost_factors: Vec::new(),
                    volume_discounts: Vec::new(),
                    regional_pricing: HashMap::new(),
                    supported_currencies: vec!["USD".to_string()],
                },
                cost_optimization: CostOptimizationFeatures {
                    cost_estimation: true,
                    cost_tracking: true,
                    budget_alerts: false,
                    optimization_recommendations: false,
                    spot_pricing: false,
                },
                budget_management: BudgetManagementFeatures {
                    budget_setting: false,
                    budget_monitoring: false,
                    spending_limits: false,
                    cost_allocation: false,
                    invoice_management: false,
                },
                cost_transparency: CostTransparencyFeatures {
                    realtime_cost_display: false,
                    detailed_breakdown: false,
                    historical_analysis: false,
                    comparison_tools: false,
                    cost_reporting: false,
                },
            },
            security: SecurityCapabilities {
                authentication: vec![AuthenticationMethod::APIKey],
                authorization: vec![AuthorizationModel::RBAC],
                encryption: EncryptionCapabilities {
                    data_at_rest: true,
                    data_in_transit: true,
                    end_to_end: false,
                    algorithms: vec!["AES-256".to_string()],
                    key_management: KeyManagementCapabilities {
                        customer_managed_keys: false,
                        hsm_support: false,
                        key_rotation: true,
                        key_escrow: false,
                        mpc_support: false,
                    },
                },
                compliance: vec![ComplianceStandard::SOC2],
                security_monitoring: SecurityMonitoringCapabilities {
                    audit_logging: true,
                    intrusion_detection: false,
                    anomaly_detection: false,
                    security_alerts: false,
                    threat_intelligence: false,
                },
            },
            support: SupportCapabilities {
                support_channels: vec![SupportChannel::Email, SupportChannel::Documentation],
                support_hours: SupportHours {
                    business_hours: true,
                    twenty_four_seven: false,
                    weekend_support: false,
                    holiday_support: false,
                    timezone_coverage: vec!["UTC".to_string()],
                },
                response_times: ResponseTimeGuarantees {
                    critical_response_time: Duration::from_secs(3600),
                    high_priority_response_time: Duration::from_secs(7200),
                    medium_priority_response_time: Duration::from_secs(86400),
                    low_priority_response_time: Duration::from_secs(3 * 86400),
                    first_response_time: Duration::from_secs(1800),
                },
                documentation_quality: DocumentationQuality {
                    completeness_score: 0.8,
                    accuracy_score: 0.9,
                    clarity_score: 0.85,
                    up_to_date_score: 0.9,
                    example_quality: 0.8,
                },
                training_education: TrainingEducationCapabilities {
                    online_courses: false,
                    workshops: false,
                    certification_programs: false,
                    consulting_services: false,
                    community_forums: true,
                },
            },
            advanced_features: AdvancedFeatures {
                ml_integration: MLIntegrationFeatures {
                    quantum_ml: false,
                    classical_ml_integration: false,
                    automl_support: false,
                    ml_frameworks: Vec::new(),
                    gpu_acceleration: false,
                },
                hybrid_computing: HybridComputingFeatures {
                    classical_quantum_integration: false,
                    realtime_feedback: false,
                    iterative_algorithms: false,
                    hpc_integration: false,
                    edge_computing: false,
                },
                quantum_networking: QuantumNetworkingFeatures {
                    quantum_internet: false,
                    qkd_support: false,
                    distributed_computing: false,
                    quantum_teleportation: false,
                    network_protocols: Vec::new(),
                },
                research_capabilities: ResearchCapabilities {
                    research_partnerships: false,
                    academic_pricing: true,
                    research_tools: false,
                    data_sharing: false,
                    publication_support: false,
                },
                experimental_features: Vec::new(),
            },
        }))
    }

    async fn cache_capabilities(
        &self,
        provider_id: &str,
        capabilities: ProviderCapabilities,
    ) -> DeviceResult<()> {
        let mut cache = self
            .capability_cache
            .write()
            .unwrap_or_else(|e| e.into_inner());
        let cached_capability = CachedCapability {
            provider_id: provider_id.to_string(),
            capabilities,
            cached_at: SystemTime::now(),
            expires_at: SystemTime::now() + self.config.cache_expiration,
            verification_status: VerificationStatus::Unverified,
            access_count: 0,
        };
        cache.insert(provider_id.to_string(), cached_capability);
        Ok(())
    }

    fn filter_providers(
        &self,
        providers: &[ProviderInfo],
        requirements: &CapabilityRequirements,
    ) -> DeviceResult<Vec<ProviderInfo>> {
        // Implementation would filter providers based on requirements
        Ok(providers.to_vec())
    }

    async fn generate_recommendations(
        &self,
        providers: &[ProviderInfo],
        requirements: &CapabilityRequirements,
    ) -> DeviceResult<Vec<ProviderRecommendation>> {
        // Implementation would generate intelligent recommendations
        Ok(Vec::new())
    }
}

// Implementation of supporting engines

impl CapabilityDiscoveryEngine {
    fn new() -> Self {
        Self {
            discovery_strategies: Vec::new(),
            verification_engine: VerificationEngine::new(),
            discovery_cache: HashMap::new(),
        }
    }

    async fn discover_providers(&self) -> DeviceResult<Vec<ProviderInfo>> {
        // Implementation would use discovery strategies
        Ok(Vec::new())
    }
}

impl CapabilityAnalytics {
    fn new(config: CapabilityAnalyticsConfig) -> Self {
        Self {
            analytics_config: config,
            historical_data: Vec::new(),
            trend_analyzers: HashMap::new(),
            predictive_models: HashMap::new(),
        }
    }
}

impl ProviderComparisonEngine {
    fn new(config: ComparisonConfig) -> Self {
        Self {
            comparison_config: config,
            ranking_algorithms: HashMap::new(),
            comparison_cache: HashMap::new(),
        }
    }

    async fn compare_providers(
        &self,
        provider_ids: &[String],
        criteria: &[ComparisonCriterion],
    ) -> DeviceResult<ComparisonResults> {
        // Implementation would perform comprehensive comparison
        Ok(ComparisonResults {
            rankings: Vec::new(),
            comparison_matrix: HashMap::new(),
            analysis_summary: AnalysisSummary {
                key_findings: Vec::new(),
                market_insights: Vec::new(),
                trends: Vec::new(),
                risk_factors: Vec::new(),
            },
            recommendations: Vec::new(),
        })
    }
}

impl CapabilityMonitor {
    fn new(config: CapabilityMonitoringConfig) -> Self {
        Self {
            monitoring_config: config,
            monitoring_targets: HashMap::new(),
            health_status: HashMap::new(),
            anomaly_detectors: HashMap::new(),
        }
    }
}

impl VerificationEngine {
    fn new() -> Self {
        Self {
            verification_strategies: Vec::new(),
            verification_cache: HashMap::new(),
        }
    }
}

/// Create a default provider capability discovery system
pub fn create_provider_discovery_system() -> ProviderCapabilityDiscoverySystem {
    ProviderCapabilityDiscoverySystem::new(DiscoveryConfig::default())
}

/// Create a high-performance discovery configuration
pub fn create_high_performance_discovery_config() -> DiscoveryConfig {
    DiscoveryConfig {
        enable_auto_discovery: true,
        discovery_interval: 1800, // 30 minutes
        enable_caching: true,
        cache_expiration: Duration::from_secs(43200), // 12 hours
        enable_monitoring: true,
        enable_analytics: true,
        discovery_strategies: vec![
            DiscoveryStrategy::APIDiscovery,
            DiscoveryStrategy::RegistryDiscovery,
            DiscoveryStrategy::NetworkDiscovery,
            DiscoveryStrategy::MLEnhancedDiscovery,
        ],
        verification_config: VerificationConfig {
            enable_verification: true,
            verification_timeout: Duration::from_secs(120),
            verification_strategies: vec![
                VerificationStrategy::EndpointTesting,
                VerificationStrategy::CapabilityProbing,
                VerificationStrategy::BenchmarkTesting,
                VerificationStrategy::HistoricalAnalysis,
            ],
            min_verification_confidence: 0.9,
            enable_continuous_verification: true,
            verification_frequency: Duration::from_secs(43200),
        },
        filtering_config: FilteringConfig {
            enable_filtering: true,
            min_requirements: CapabilityRequirements {
                min_qubits: Some(5),
                max_error_rate: Some(0.05),
                required_gates: ["H", "CNOT", "RZ", "RY", "RX"]
                    .iter()
                    .map(|s| s.to_string())
                    .collect(),
                required_connectivity: Some(ConnectivityRequirement::MinimumDegree(2)),
                required_features: [
                    ProviderFeature::QuantumComputing,
                    ProviderFeature::NoiseModeling,
                ]
                .iter()
                .cloned()
                .collect(),
                performance_requirements: PerformanceRequirements {
                    max_execution_time: Some(Duration::from_secs(300)),
                    min_throughput: Some(50.0),
                    max_queue_time: Some(Duration::from_secs(1800)),
                    min_availability: Some(0.95),
                    max_cost_per_shot: Some(0.1),
                },
            },
            excluded_providers: HashSet::new(),
            preferred_providers: Vec::new(),
            quality_thresholds: QualityThresholds {
                min_fidelity: 0.9,
                max_error_rate: 0.05,
                min_uptime: 0.98,
                min_reliability: 0.95,
                min_performance: 0.8,
            },
            geographic_restrictions: None,
        },
        analytics_config: CapabilityAnalyticsConfig {
            enable_trend_analysis: true,
            enable_predictive_analytics: true,
            enable_comparative_analysis: true,
            analysis_depth: AnalysisDepth::Comprehensive,
            retention_period: Duration::from_secs(90 * 86400), // 90 days
            confidence_level: 0.99,
        },
        monitoring_config: CapabilityMonitoringConfig {
            enable_realtime_monitoring: true,
            monitoring_frequency: Duration::from_secs(60), // 1 minute
            health_check_interval: Duration::from_secs(300), // 5 minutes
            alert_thresholds: [
                ("availability".to_string(), 0.95),
                ("error_rate".to_string(), 0.05),
                ("response_time".to_string(), 5000.0),
            ]
            .iter()
            .cloned()
            .collect(),
            enable_anomaly_detection: true,
            anomaly_sensitivity: 0.9,
        },
        comparison_config: ComparisonConfig {
            enable_auto_comparison: true,
            comparison_criteria: vec![
                ComparisonCriterion::Performance,
                ComparisonCriterion::Cost,
                ComparisonCriterion::Reliability,
                ComparisonCriterion::Availability,
                ComparisonCriterion::Features,
                ComparisonCriterion::Security,
            ],
            ranking_algorithms: vec![
                RankingAlgorithm::WeightedSum,
                RankingAlgorithm::TOPSIS,
                RankingAlgorithm::MachineLearning,
            ],
            criterion_weights: [
                ("performance".to_string(), 0.3),
                ("cost".to_string(), 0.2),
                ("reliability".to_string(), 0.2),
                ("availability".to_string(), 0.15),
                ("features".to_string(), 0.1),
                ("security".to_string(), 0.05),
            ]
            .iter()
            .cloned()
            .collect(),
            enable_multidimensional_analysis: true,
        },
    }
}

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

    #[test]
    fn test_discovery_config_default() {
        let config = DiscoveryConfig::default();
        assert!(config.enable_auto_discovery);
        assert_eq!(config.discovery_interval, 3600);
        assert!(config.enable_caching);
        assert!(config.enable_monitoring);
        assert!(config.enable_analytics);
    }

    #[test]
    fn test_provider_info_creation() {
        let provider = ProviderInfo {
            provider_id: "test_provider".to_string(),
            name: "Test Provider".to_string(),
            description: "A test quantum provider".to_string(),
            provider_type: ProviderType::CloudProvider,
            contact_info: ContactInfo {
                support_email: Some("support@test.com".to_string()),
                support_phone: None,
                support_website: None,
                technical_contact: None,
                business_contact: None,
                emergency_contact: None,
            },
            endpoints: Vec::new(),
            supported_regions: vec!["us-east-1".to_string()],
            pricing_model: PricingModel {
                pricing_type: PricingType::PayPerUse,
                cost_per_shot: Some(0.01),
                cost_per_circuit: None,
                cost_per_hour: None,
                monthly_subscription: None,
                free_tier: None,
                currency: "USD".to_string(),
                billing_model: BillingModel::Postpaid,
            },
            terms_of_service: None,
            privacy_policy: None,
            compliance_certifications: Vec::new(),
            last_updated: SystemTime::now(),
        };

        assert_eq!(provider.provider_id, "test_provider");
        assert_eq!(provider.provider_type, ProviderType::CloudProvider);
    }

    #[test]
    fn test_capability_requirements() {
        let requirements = CapabilityRequirements {
            min_qubits: Some(5),
            max_error_rate: Some(0.01),
            required_gates: ["H", "CNOT"].iter().map(|s| s.to_string()).collect(),
            required_connectivity: Some(ConnectivityRequirement::FullyConnected),
            required_features: [ProviderFeature::QuantumComputing]
                .iter()
                .cloned()
                .collect(),
            performance_requirements: PerformanceRequirements {
                max_execution_time: Some(Duration::from_secs(300)),
                min_throughput: Some(100.0),
                max_queue_time: Some(Duration::from_secs(60)),
                min_availability: Some(0.99),
                max_cost_per_shot: Some(0.005),
            },
        };

        assert_eq!(requirements.min_qubits, Some(5));
        assert_eq!(requirements.max_error_rate, Some(0.01));
        assert!(requirements
            .required_features
            .contains(&ProviderFeature::QuantumComputing));
    }

    #[test]
    fn test_discovery_system_creation() {
        let config = DiscoveryConfig::default();
        let system = ProviderCapabilityDiscoverySystem::new(config);
        // System should be created successfully
    }

    #[test]
    fn test_high_performance_config() {
        let config = create_high_performance_discovery_config();
        assert_eq!(config.discovery_interval, 1800);
        assert_eq!(
            config.analytics_config.analysis_depth,
            AnalysisDepth::Comprehensive
        );
        assert_eq!(config.verification_config.min_verification_confidence, 0.9);
    }

    #[tokio::test]
    async fn test_discovery_system_start() {
        let config = DiscoveryConfig::default();
        let system = ProviderCapabilityDiscoverySystem::new(config);

        let start_result = system.start().await;
        assert!(start_result.is_ok());
    }
}