quantrs2-device 0.1.3

//! Hardware adaptation and analysis for dynamical decoupling

use std::collections::HashMap;
use std::time::Duration;

use super::{
    config::{DDHardwareConfig, DDPulseConfig},
    sequences::DDSequence,
};
use crate::{calibration::CalibrationManager, topology::HardwareTopology, DeviceResult};
use quantrs2_core::qubit::QubitId;

/// Hardware analysis results for DD sequences
#[derive(Debug, Clone)]
pub struct DDHardwareAnalysis {
    /// Hardware compatibility
    pub hardware_compatibility: HardwareCompatibility,
    /// Resource utilization
    pub resource_utilization: ResourceUtilization,
    /// Timing analysis
    pub timing_analysis: TimingAnalysis,
    /// Connectivity analysis
    pub connectivity_analysis: ConnectivityAnalysis,
    /// Error characterization
    pub error_characterization: HardwareErrorCharacterization,
    /// Implementation recommendations
    pub implementation_recommendations: ImplementationRecommendations,
    /// Platform-specific optimizations
    pub platform_optimizations: Vec<String>,
}

/// Hardware compatibility assessment
#[derive(Debug, Clone)]
pub struct HardwareCompatibility {
    /// Overall compatibility score
    pub compatibility_score: f64,
    /// Gate set compatibility
    pub gate_set_compatibility: GateSetCompatibility,
    /// Timing constraints satisfaction
    pub timing_constraints_satisfied: bool,
    /// Connectivity requirements met
    pub connectivity_requirements_met: bool,
    /// Hardware limitations
    pub hardware_limitations: Vec<HardwareLimitation>,
    /// Adaptation requirements
    pub adaptation_requirements: Vec<AdaptationRequirement>,
}

/// Gate set compatibility
#[derive(Debug, Clone)]
pub struct GateSetCompatibility {
    /// Available gates
    pub available_gates: Vec<String>,
    /// Required gates
    pub required_gates: Vec<String>,
    /// Missing gates
    pub missing_gates: Vec<String>,
    /// Gate decomposition map
    pub gate_decompositions: HashMap<String, Vec<String>>,
    /// Decomposition overhead
    pub decomposition_overhead: HashMap<String, f64>,
}

/// Hardware limitation
#[derive(Debug, Clone)]
pub struct HardwareLimitation {
    /// Limitation type
    pub limitation_type: LimitationType,
    /// Description
    pub description: String,
    /// Severity
    pub severity: LimitationSeverity,
    /// Impact on performance
    pub performance_impact: f64,
    /// Mitigation strategies
    pub mitigation_strategies: Vec<String>,
}

/// Types of hardware limitations
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum LimitationType {
    /// Gate set limitations
    GateSet,
    /// Connectivity constraints
    Connectivity,
    /// Timing constraints
    Timing,
    /// Coherence limitations
    Coherence,
    /// Control limitations
    Control,
    /// Readout limitations
    Readout,
}

/// Severity of limitations
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum LimitationSeverity {
    Low,
    Medium,
    High,
    Critical,
}

/// Adaptation requirement
#[derive(Debug, Clone)]
pub struct AdaptationRequirement {
    /// Requirement type
    pub requirement_type: AdaptationType,
    /// Description
    pub description: String,
    /// Priority
    pub priority: AdaptationPriority,
    /// Implementation complexity
    pub complexity: AdaptationComplexity,
    /// Expected benefit
    pub expected_benefit: f64,
}

/// Types of adaptations
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AdaptationType {
    /// Gate decomposition
    GateDecomposition,
    /// Routing adaptation
    Routing,
    /// Timing optimization
    TimingOptimization,
    /// Pulse optimization
    PulseOptimization,
    /// Error mitigation
    ErrorMitigation,
}

/// Adaptation priority
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AdaptationPriority {
    Low,
    Medium,
    High,
    Critical,
}

/// Adaptation complexity
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AdaptationComplexity {
    Simple,
    Moderate,
    Complex,
    VeryComplex,
}

/// Resource utilization analysis
#[derive(Debug, Clone)]
pub struct ResourceUtilization {
    /// Qubit utilization
    pub qubit_utilization: QubitUtilization,
    /// Gate resource usage
    pub gate_resource_usage: GateResourceUsage,
    /// Memory requirements
    pub memory_requirements: MemoryRequirements,
    /// Bandwidth requirements
    pub bandwidth_requirements: BandwidthRequirements,
    /// Power consumption
    pub power_consumption: PowerConsumption,
}

/// Qubit utilization
#[derive(Debug, Clone)]
pub struct QubitUtilization {
    /// Total qubits used
    pub total_qubits_used: usize,
    /// Qubit usage efficiency
    pub usage_efficiency: f64,
    /// Idle time per qubit
    pub idle_times: HashMap<QubitId, Duration>,
    /// Active time per qubit
    pub active_times: HashMap<QubitId, Duration>,
    /// Utilization per qubit
    pub utilization_per_qubit: HashMap<QubitId, f64>,
}

/// Gate resource usage
#[derive(Debug, Clone)]
pub struct GateResourceUsage {
    /// Gate count by type
    pub gate_counts: HashMap<String, usize>,
    /// Execution time by gate type
    pub execution_times: HashMap<String, Duration>,
    /// Resource efficiency
    pub resource_efficiency: f64,
    /// Parallel execution opportunities
    pub parallel_opportunities: usize,
}

/// Memory requirements
#[derive(Debug, Clone)]
pub struct MemoryRequirements {
    /// Classical memory required
    pub classical_memory: usize,
    /// Quantum state memory
    pub quantum_memory: usize,
    /// Control memory
    pub control_memory: usize,
    /// Total memory footprint
    pub total_memory: usize,
    /// Memory efficiency
    pub memory_efficiency: f64,
}

/// Bandwidth requirements
#[derive(Debug, Clone)]
pub struct BandwidthRequirements {
    /// Control bandwidth
    pub control_bandwidth: f64,
    /// Readout bandwidth
    pub readout_bandwidth: f64,
    /// Data transfer bandwidth
    pub data_bandwidth: f64,
    /// Peak bandwidth usage
    pub peak_bandwidth: f64,
    /// Average bandwidth usage
    pub average_bandwidth: f64,
}

/// Power consumption analysis
#[derive(Debug, Clone)]
pub struct PowerConsumption {
    /// Control power
    pub control_power: f64,
    /// Cooling power
    pub cooling_power: f64,
    /// Electronics power
    pub electronics_power: f64,
    /// Total power
    pub total_power: f64,
    /// Power efficiency
    pub power_efficiency: f64,
}

/// Timing analysis
#[derive(Debug, Clone)]
pub struct TimingAnalysis {
    /// Total execution time
    pub total_execution_time: Duration,
    /// Critical path analysis
    pub critical_path: CriticalPathAnalysis,
    /// Timing constraints
    pub timing_constraints: TimingConstraints,
    /// Timing optimization opportunities
    pub optimization_opportunities: Vec<TimingOptimization>,
    /// Synchronization requirements
    pub synchronization_requirements: SynchronizationRequirements,
}

/// Critical path analysis
#[derive(Debug, Clone)]
pub struct CriticalPathAnalysis {
    /// Critical path length
    pub critical_path_length: Duration,
    /// Critical path gates
    pub critical_path_gates: Vec<String>,
    /// Bottleneck identification
    pub bottlenecks: Vec<TimingBottleneck>,
    /// Slack analysis
    pub slack_analysis: SlackAnalysis,
}

/// Timing bottleneck
#[derive(Debug, Clone)]
pub struct TimingBottleneck {
    /// Bottleneck location
    pub location: String,
    /// Delay amount
    pub delay: Duration,
    /// Impact on total time
    pub impact: f64,
    /// Mitigation strategies
    pub mitigations: Vec<String>,
}

/// Slack analysis
#[derive(Debug, Clone)]
pub struct SlackAnalysis {
    /// Total slack
    pub total_slack: Duration,
    /// Free slack per operation
    pub free_slack: HashMap<String, Duration>,
    /// Slack utilization opportunities
    pub slack_opportunities: Vec<SlackOpportunity>,
}

/// Slack utilization opportunity
#[derive(Debug, Clone)]
pub struct SlackOpportunity {
    /// Operation that can be optimized
    pub operation: String,
    /// Available slack
    pub available_slack: Duration,
    /// Potential benefit
    pub potential_benefit: f64,
    /// Implementation difficulty
    pub difficulty: f64,
}

/// Timing constraints
#[derive(Debug, Clone)]
pub struct TimingConstraints {
    /// Minimum gate duration
    pub min_gate_duration: Duration,
    /// Maximum gate duration
    pub max_gate_duration: Duration,
    /// Coherence time constraints
    pub coherence_constraints: HashMap<QubitId, Duration>,
    /// Synchronization tolerances
    pub sync_tolerances: HashMap<String, Duration>,
}

/// Timing optimization
#[derive(Debug, Clone)]
pub struct TimingOptimization {
    /// Optimization type
    pub optimization_type: TimingOptimizationType,
    /// Expected improvement
    pub expected_improvement: Duration,
    /// Implementation cost
    pub implementation_cost: f64,
    /// Risk level
    pub risk_level: OptimizationRisk,
}

/// Types of timing optimizations
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TimingOptimizationType {
    /// Parallel execution
    Parallelization,
    /// Gate duration optimization
    GateDurationOptimization,
    /// Scheduling optimization
    SchedulingOptimization,
    /// Pipeline optimization
    PipelineOptimization,
}

/// Risk level for optimizations
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum OptimizationRisk {
    Low,
    Medium,
    High,
}

/// Synchronization requirements
#[derive(Debug, Clone, PartialEq)]
pub enum SynchronizationRequirements {
    /// Loose synchronization requirements
    Loose,
    /// Strict synchronization requirements
    Strict,
    /// Adaptive synchronization requirements
    Adaptive,
    /// Custom synchronization configuration
    Custom {
        /// Global synchronization needed
        global_sync_required: bool,
        /// Local synchronization points
        local_sync_points: Vec<SyncPoint>,
        /// Timing tolerance requirements
        timing_tolerances: HashMap<String, f64>,
        /// Clock domain requirements
        clock_domains: Vec<ClockDomain>,
    },
}

/// Synchronization point
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct SyncPoint {
    /// Point location in sequence
    pub location: usize,
    /// Synchronization type
    pub sync_type: SyncType,
    /// Tolerance
    pub tolerance: Duration,
    /// Critical level
    pub criticality: SyncCriticality,
}

/// Types of synchronization
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum SyncType {
    HardSync,
    SoftSync,
    PhaseSync,
    FrequencySync,
}

/// Synchronization criticality
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum SyncCriticality {
    Low,
    Medium,
    High,
    Critical,
}

/// Clock domain
#[derive(Debug, Clone, PartialEq)]
pub struct ClockDomain {
    /// Domain name
    pub name: String,
    /// Clock frequency
    pub frequency: f64,
    /// Phase relationship
    pub phase_offset: f64,
    /// Jitter tolerance
    pub jitter_tolerance: f64,
}

/// Connectivity analysis
#[derive(Debug, Clone)]
pub struct ConnectivityAnalysis {
    /// Required connectivity
    pub required_connectivity: RequiredConnectivity,
    /// Available connectivity
    pub available_connectivity: AvailableConnectivity,
    /// Routing analysis
    pub routing_analysis: RoutingAnalysis,
    /// Connectivity optimization
    pub optimization_suggestions: Vec<ConnectivityOptimization>,
}

/// Required connectivity
#[derive(Debug, Clone)]
pub struct RequiredConnectivity {
    /// Direct connections needed
    pub direct_connections: Vec<(QubitId, QubitId)>,
    /// Indirect connections needed
    pub indirect_connections: Vec<ConnectivityPath>,
    /// Connectivity quality requirements
    pub quality_requirements: HashMap<(QubitId, QubitId), ConnectivityQuality>,
}

/// Connectivity path
#[derive(Debug, Clone)]
pub struct ConnectivityPath {
    /// Source qubit
    pub source: QubitId,
    /// Target qubit
    pub target: QubitId,
    /// Path through intermediate qubits
    pub path: Vec<QubitId>,
    /// Path length
    pub length: usize,
    /// Path quality
    pub quality: f64,
}

/// Connectivity quality requirements
#[derive(Debug, Clone)]
pub struct ConnectivityQuality {
    /// Minimum fidelity
    pub min_fidelity: f64,
    /// Maximum error rate
    pub max_error_rate: f64,
    /// Required bandwidth
    pub required_bandwidth: f64,
    /// Latency tolerance
    pub latency_tolerance: Duration,
}

/// Available connectivity
#[derive(Debug, Clone)]
pub struct AvailableConnectivity {
    /// Physical connections
    pub physical_connections: Vec<(QubitId, QubitId)>,
    /// Connection qualities
    pub connection_qualities: HashMap<(QubitId, QubitId), ConnectivityQuality>,
    /// Routing capabilities
    pub routing_capabilities: RoutingCapabilities,
}

/// Routing capabilities
#[derive(Debug, Clone)]
pub struct RoutingCapabilities {
    /// Maximum routing distance
    pub max_routing_distance: usize,
    /// Routing fidelity degradation
    pub fidelity_degradation_per_hop: f64,
    /// Routing latency per hop
    pub latency_per_hop: Duration,
    /// Parallel routing capacity
    pub parallel_routing_capacity: usize,
}

/// Routing analysis results
#[derive(Debug, Clone)]
pub struct RoutingAnalysis {
    /// Routing success rate
    pub success_rate: f64,
    /// Average path length
    pub average_path_length: f64,
    /// Routing overhead
    pub routing_overhead: f64,
    /// Bottleneck connections
    pub bottleneck_connections: Vec<(QubitId, QubitId)>,
    /// Alternative routing options
    pub alternative_routes: HashMap<(QubitId, QubitId), Vec<ConnectivityPath>>,
}

/// Connectivity optimization suggestion
#[derive(Debug, Clone)]
pub struct ConnectivityOptimization {
    /// Optimization type
    pub optimization_type: ConnectivityOptimizationType,
    /// Target connections
    pub target_connections: Vec<(QubitId, QubitId)>,
    /// Expected improvement
    pub expected_improvement: f64,
    /// Implementation cost
    pub implementation_cost: f64,
    /// Feasibility
    pub feasibility: OptimizationFeasibility,
}

/// Types of connectivity optimizations
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ConnectivityOptimizationType {
    /// Add direct connections
    AddDirectConnections,
    /// Improve connection quality
    ImproveConnectionQuality,
    /// Optimize routing algorithms
    OptimizeRouting,
    /// Add intermediate qubits
    AddIntermediateQubits,
}

/// Optimization feasibility
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum OptimizationFeasibility {
    HighlyFeasible,
    Feasible,
    Challenging,
    Infeasible,
}

/// Hardware error characterization
#[derive(Debug, Clone)]
pub struct HardwareErrorCharacterization {
    /// Gate error rates
    pub gate_error_rates: HashMap<String, f64>,
    /// Qubit error rates
    pub qubit_error_rates: HashMap<QubitId, QubitErrorRates>,
    /// Correlated errors
    pub correlated_errors: CorrelatedErrors,
    /// Error mitigation effectiveness
    pub mitigation_effectiveness: HashMap<String, f64>,
    /// Error model validation
    pub error_model_validation: ErrorModelValidation,
}

/// Qubit error rates
#[derive(Debug, Clone)]
pub struct QubitErrorRates {
    /// T1 (amplitude damping) time
    pub t1_time: Duration,
    /// T2* (dephasing) time
    pub t2_star_time: Duration,
    /// T2 (echo) time
    pub t2_echo_time: Duration,
    /// Readout error rate
    pub readout_error_rate: f64,
    /// State preparation error rate
    pub preparation_error_rate: f64,
}

/// Correlated error analysis
#[derive(Debug, Clone)]
pub struct CorrelatedErrors {
    /// Spatial correlations
    pub spatial_correlations: HashMap<(QubitId, QubitId), f64>,
    /// Temporal correlations
    pub temporal_correlations: HashMap<QubitId, f64>,
    /// Cross-talk matrix
    pub crosstalk_matrix: HashMap<(QubitId, QubitId), f64>,
    /// Correlated failure modes
    pub correlated_failure_modes: Vec<CorrelatedFailureMode>,
}

/// Correlated failure mode
#[derive(Debug, Clone)]
pub struct CorrelatedFailureMode {
    /// Affected qubits
    pub affected_qubits: Vec<QubitId>,
    /// Failure probability
    pub failure_probability: f64,
    /// Failure mechanism
    pub mechanism: String,
    /// Mitigation strategies
    pub mitigation_strategies: Vec<String>,
}

/// Error model validation
#[derive(Debug, Clone)]
pub struct ErrorModelValidation {
    /// Model accuracy
    pub model_accuracy: f64,
    /// Prediction error
    pub prediction_error: f64,
    /// Validation metrics
    pub validation_metrics: HashMap<String, f64>,
    /// Model limitations
    pub model_limitations: Vec<String>,
}

/// Implementation recommendations
#[derive(Debug, Clone)]
pub struct ImplementationRecommendations {
    /// High-priority recommendations
    pub high_priority: Vec<Recommendation>,
    /// Medium-priority recommendations
    pub medium_priority: Vec<Recommendation>,
    /// Low-priority recommendations
    pub low_priority: Vec<Recommendation>,
    /// Implementation roadmap
    pub implementation_roadmap: ImplementationRoadmap,
}

/// Implementation recommendation
#[derive(Debug, Clone)]
pub struct Recommendation {
    /// Recommendation title
    pub title: String,
    /// Description
    pub description: String,
    /// Expected benefit
    pub expected_benefit: f64,
    /// Implementation effort
    pub implementation_effort: ImplementationEffort,
    /// Timeline
    pub timeline: Duration,
    /// Dependencies
    pub dependencies: Vec<String>,
}

/// Implementation effort levels
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ImplementationEffort {
    Minimal,
    Low,
    Medium,
    High,
    Extensive,
}

/// Implementation roadmap
#[derive(Debug, Clone)]
pub struct ImplementationRoadmap {
    /// Phases
    pub phases: Vec<ImplementationPhase>,
    /// Total timeline
    pub total_timeline: Duration,
    /// Resource requirements
    pub resource_requirements: RoadmapResourceRequirements,
    /// Risk assessment
    pub risk_assessment: RoadmapRiskAssessment,
}

/// Implementation phase
#[derive(Debug, Clone)]
pub struct ImplementationPhase {
    /// Phase name
    pub name: String,
    /// Duration
    pub duration: Duration,
    /// Deliverables
    pub deliverables: Vec<String>,
    /// Dependencies
    pub dependencies: Vec<String>,
    /// Success criteria
    pub success_criteria: Vec<String>,
}

/// Roadmap resource requirements
#[derive(Debug, Clone)]
pub struct RoadmapResourceRequirements {
    /// Engineering effort
    pub engineering_effort: f64,
    /// Hardware modifications
    pub hardware_modifications: Vec<String>,
    /// Software updates
    pub software_updates: Vec<String>,
    /// Budget estimate
    pub budget_estimate: f64,
}

/// Roadmap risk assessment
#[derive(Debug, Clone)]
pub struct RoadmapRiskAssessment {
    /// Technical risks
    pub technical_risks: Vec<Risk>,
    /// Schedule risks
    pub schedule_risks: Vec<Risk>,
    /// Resource risks
    pub resource_risks: Vec<Risk>,
    /// Mitigation strategies
    pub mitigation_strategies: HashMap<String, Vec<String>>,
}

/// Risk assessment
#[derive(Debug, Clone)]
pub struct Risk {
    /// Risk description
    pub description: String,
    /// Probability
    pub probability: f64,
    /// Impact
    pub impact: f64,
    /// Risk score
    pub risk_score: f64,
    /// Mitigation actions
    pub mitigation_actions: Vec<String>,
}

/// DD hardware analyzer
pub struct DDHardwareAnalyzer {
    pub config: DDHardwareConfig,
    pub calibration_manager: Option<CalibrationManager>,
    pub topology: Option<HardwareTopology>,
}

impl DDHardwareAnalyzer {
    /// Create new hardware analyzer
    pub const fn new(
        config: DDHardwareConfig,
        calibration_manager: Option<CalibrationManager>,
        topology: Option<HardwareTopology>,
    ) -> Self {
        Self {
            config,
            calibration_manager,
            topology,
        }
    }

    /// Analyze hardware implementation
    pub fn analyze_hardware_implementation(
        &self,
        device_id: &str,
        sequence: &DDSequence,
    ) -> DeviceResult<DDHardwareAnalysis> {
        println!("Starting DD hardware analysis for device: {device_id}");

        let hardware_compatibility = self.assess_hardware_compatibility(sequence)?;
        let resource_utilization = self.analyze_resource_utilization(sequence)?;
        let timing_analysis = self.perform_timing_analysis(sequence)?;
        let connectivity_analysis = self.analyze_connectivity(sequence)?;
        let error_characterization = self.characterize_hardware_errors(sequence)?;
        let implementation_recommendations =
            self.generate_implementation_recommendations(sequence)?;

        Ok(DDHardwareAnalysis {
            hardware_compatibility,
            resource_utilization,
            timing_analysis,
            connectivity_analysis,
            error_characterization,
            implementation_recommendations,
            platform_optimizations: vec![
                "Gate decomposition optimization".to_string(),
                "Timing optimization".to_string(),
                "Error mitigation integration".to_string(),
            ],
        })
    }

    /// Assess hardware compatibility
    fn assess_hardware_compatibility(
        &self,
        sequence: &DDSequence,
    ) -> DeviceResult<HardwareCompatibility> {
        // Simplified implementation
        let gate_set_compatibility = GateSetCompatibility {
            available_gates: vec!["X".to_string(), "Y".to_string(), "Z".to_string()],
            required_gates: vec!["X".to_string(), "Y".to_string()],
            missing_gates: Vec::new(),
            gate_decompositions: HashMap::new(),
            decomposition_overhead: HashMap::new(),
        };

        Ok(HardwareCompatibility {
            compatibility_score: 0.95,
            gate_set_compatibility,
            timing_constraints_satisfied: true,
            connectivity_requirements_met: true,
            hardware_limitations: Vec::new(),
            adaptation_requirements: Vec::new(),
        })
    }

    /// Analyze resource utilization
    fn analyze_resource_utilization(
        &self,
        sequence: &DDSequence,
    ) -> DeviceResult<ResourceUtilization> {
        // Simplified implementation
        let qubit_utilization = QubitUtilization {
            total_qubits_used: sequence.target_qubits.len(),
            usage_efficiency: 0.85,
            idle_times: HashMap::new(),
            active_times: HashMap::new(),
            utilization_per_qubit: HashMap::new(),
        };

        let gate_resource_usage = GateResourceUsage {
            gate_counts: HashMap::new(),
            execution_times: HashMap::new(),
            resource_efficiency: 0.8,
            parallel_opportunities: 2,
        };

        Ok(ResourceUtilization {
            qubit_utilization,
            gate_resource_usage,
            memory_requirements: MemoryRequirements {
                classical_memory: 1024,
                quantum_memory: 512,
                control_memory: 256,
                total_memory: 1792,
                memory_efficiency: 0.9,
            },
            bandwidth_requirements: BandwidthRequirements {
                control_bandwidth: 100.0,
                readout_bandwidth: 50.0,
                data_bandwidth: 25.0,
                peak_bandwidth: 150.0,
                average_bandwidth: 75.0,
            },
            power_consumption: PowerConsumption {
                control_power: 10.0,
                cooling_power: 5.0,
                electronics_power: 2.0,
                total_power: 17.0,
                power_efficiency: 0.7,
            },
        })
    }

    /// Perform timing analysis
    fn perform_timing_analysis(&self, sequence: &DDSequence) -> DeviceResult<TimingAnalysis> {
        Ok(TimingAnalysis {
            total_execution_time: Duration::from_micros((sequence.duration * 1e6) as u64),
            critical_path: CriticalPathAnalysis {
                critical_path_length: Duration::from_micros((sequence.duration * 1e6) as u64),
                critical_path_gates: vec!["X".to_string(), "Y".to_string()],
                bottlenecks: Vec::new(),
                slack_analysis: SlackAnalysis {
                    total_slack: Duration::from_nanos(100),
                    free_slack: HashMap::new(),
                    slack_opportunities: Vec::new(),
                },
            },
            timing_constraints: TimingConstraints {
                min_gate_duration: Duration::from_nanos(10),
                max_gate_duration: Duration::from_micros(1),
                coherence_constraints: HashMap::new(),
                sync_tolerances: HashMap::new(),
            },
            optimization_opportunities: Vec::new(),
            synchronization_requirements: SynchronizationRequirements::Loose,
        })
    }

    /// Analyze connectivity
    fn analyze_connectivity(&self, sequence: &DDSequence) -> DeviceResult<ConnectivityAnalysis> {
        Ok(ConnectivityAnalysis {
            required_connectivity: RequiredConnectivity {
                direct_connections: Vec::new(),
                indirect_connections: Vec::new(),
                quality_requirements: HashMap::new(),
            },
            available_connectivity: AvailableConnectivity {
                physical_connections: Vec::new(),
                connection_qualities: HashMap::new(),
                routing_capabilities: RoutingCapabilities {
                    max_routing_distance: 5,
                    fidelity_degradation_per_hop: 0.01,
                    latency_per_hop: Duration::from_nanos(10),
                    parallel_routing_capacity: 4,
                },
            },
            routing_analysis: RoutingAnalysis {
                success_rate: 0.98,
                average_path_length: 1.2,
                routing_overhead: 0.05,
                bottleneck_connections: Vec::new(),
                alternative_routes: HashMap::new(),
            },
            optimization_suggestions: Vec::new(),
        })
    }

    /// Characterize hardware errors
    fn characterize_hardware_errors(
        &self,
        _sequence: &DDSequence,
    ) -> DeviceResult<HardwareErrorCharacterization> {
        Ok(HardwareErrorCharacterization {
            gate_error_rates: HashMap::new(),
            qubit_error_rates: HashMap::new(),
            correlated_errors: CorrelatedErrors {
                spatial_correlations: HashMap::new(),
                temporal_correlations: HashMap::new(),
                crosstalk_matrix: HashMap::new(),
                correlated_failure_modes: Vec::new(),
            },
            mitigation_effectiveness: HashMap::new(),
            error_model_validation: ErrorModelValidation {
                model_accuracy: 0.95,
                prediction_error: 0.05,
                validation_metrics: HashMap::new(),
                model_limitations: Vec::new(),
            },
        })
    }

    /// Generate implementation recommendations
    fn generate_implementation_recommendations(
        &self,
        _sequence: &DDSequence,
    ) -> DeviceResult<ImplementationRecommendations> {
        Ok(ImplementationRecommendations {
            high_priority: Vec::new(),
            medium_priority: Vec::new(),
            low_priority: Vec::new(),
            implementation_roadmap: ImplementationRoadmap {
                phases: Vec::new(),
                total_timeline: Duration::from_secs(3600), // 1 hour
                resource_requirements: RoadmapResourceRequirements {
                    engineering_effort: 40.0, // hours
                    hardware_modifications: Vec::new(),
                    software_updates: Vec::new(),
                    budget_estimate: 10000.0,
                },
                risk_assessment: RoadmapRiskAssessment {
                    technical_risks: Vec::new(),
                    schedule_risks: Vec::new(),
                    resource_risks: Vec::new(),
                    mitigation_strategies: HashMap::new(),
                },
            },
        })
    }
}