//! Optimization Validation Module
//!
//! This module provides comprehensive validation capabilities for CUDA memory optimization strategies,
//! including risk assessment, compliance checking, performance validation, and safety enforcement.

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

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

#[derive(Debug, Clone, Default)]
pub struct StatisticalTestRegistry {}
#[derive(Debug, Clone, Default)]
pub struct HypothesisTestingFramework {}
#[derive(Debug, Clone, Default)]
pub struct ConfidenceIntervalCalculator {}
#[derive(Debug, Clone, Default)]
pub struct EffectSizeAnalyzer {}
#[derive(Debug, Clone, Default)]
pub struct PowerAnalysisSystem {}
#[derive(Debug, Clone, Default)]
pub struct MultipleComparisonCorrection {}
#[derive(Debug, Clone, Default)]
pub struct BayesianAnalysisFramework {}
#[derive(Debug, Clone, Default)]
pub struct NonParametricTestingFramework {}
#[derive(Debug, Clone, Default)]
pub struct ABExperiment {}
#[derive(Debug, Clone, Default)]
pub struct ExperimentDesigner {}
#[derive(Debug, Clone, Default)]
pub struct ABTestAnalysisEngine {}
#[derive(Debug, Clone, Default)]
pub struct TrafficSplitter {}
#[derive(Debug, Clone, Default)]
pub struct ABTestResultInterpreter {}
#[derive(Debug, Clone, Default)]
pub struct ExperimentScheduler {}
#[derive(Debug, Clone, Default)]
pub struct BiasDetectionSystem {}
#[derive(Debug, Clone, Default)]
pub struct ABTestPowerCalculator {}

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

/// Comprehensive optimization validator with enterprise-grade validation capabilities
#[derive(Debug)]
pub struct OptimizationValidator {
    /// Validation strategies indexed by name
    validation_strategies: HashMap<String, ValidationStrategy>,
    /// Active validation rules
    validation_rules: Vec<ValidationRule>,
    /// Risk assessment components
    risk_assessors: Vec<RiskAssessor>,
    /// Validation history tracking
    validation_history: VecDeque<ValidationEvent>,
    /// Validator configuration
    config: ValidatorConfig,
    /// Compliance framework integration
    compliance_framework: ComplianceFramework,
    /// Real-time constraint monitor
    constraint_monitor: ConstraintMonitor,
    /// Validation result cache
    result_cache: Arc<RwLock<HashMap<String, CachedValidationResult>>>,
    /// Statistical validation framework
    statistical_validator: StatisticalValidator,
    /// A/B testing framework
    ab_testing_framework: ABTestingFramework,
    /// Validation pipeline orchestrator
    pipeline_orchestrator: ValidationPipelineOrchestrator,
    /// Anomaly detection for validation
    anomaly_detector: ValidationAnomalyDetector,
    /// Automated validation report generator
    report_generator: ValidationReportGenerator,
    /// Validation metrics collector
    metrics_collector: ValidationMetricsCollector,
}

/// Validation strategy configuration
#[derive(Debug, Clone)]
pub struct ValidationStrategy {
    /// Strategy name and identifier
    pub name: String,
    /// Validation methods to employ
    pub methods: Vec<ValidationMethod>,
    /// Strategy priority level
    pub priority: ValidationPriority,
    /// Execution timeout
    pub timeout: Duration,
    /// Retry configuration
    pub retry_config: RetryConfig,
    /// Resource requirements
    pub resource_requirements: ResourceRequirements,
    /// Success criteria
    pub success_criteria: Vec<SuccessCriterion>,
    /// Failure handling strategy
    pub failure_handling: FailureHandlingStrategy,
    /// Dependency validation requirements
    pub dependencies: Vec<String>,
    /// Validation context requirements
    pub context_requirements: ContextRequirements,
    /// Performance benchmarks
    pub performance_benchmarks: PerformanceBenchmarks,
}

/// Available validation methods
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ValidationMethod {
    /// Monte Carlo simulation testing
    Simulation,
    /// Static code analysis
    StaticAnalysis,
    /// Historical performance comparison
    HistoricalComparison,
    /// A/B testing framework
    ABTesting,
    /// Cross-validation statistical testing
    CrossValidation,
    /// Model-based validation
    ModelBasedValidation,
    /// Formal verification methods
    FormalVerification,
    /// Property-based testing
    PropertyBasedTesting,
    /// Mutation testing
    MutationTesting,
    /// Load testing and stress testing
    LoadTesting,
    /// Security validation
    SecurityValidation,
    /// Compliance validation
    ComplianceValidation,
    /// Performance regression testing
    RegressionTesting,
    /// Integration testing
    IntegrationTesting,
    /// End-to-end validation
    EndToEndValidation,
}

/// Validation rule with comprehensive configuration
#[derive(Debug, Clone)]
pub struct ValidationRule {
    /// Unique rule identifier
    pub id: String,
    /// Human-readable rule description
    pub description: String,
    /// Rule condition logic
    pub condition: ValidationCondition,
    /// Rule severity level
    pub severity: ValidationSeverity,
    /// Enforcement action
    pub enforcement: ValidationEnforcement,
    /// Rule category
    pub category: RuleCategory,
    /// Rule version and metadata
    pub version: String,
    /// Rule author and maintainer
    pub author: String,
    /// Rule activation conditions
    pub activation_conditions: Vec<ActivationCondition>,
    /// Rule exemption conditions
    pub exemptions: Vec<ExemptionCondition>,
    /// Rule dependencies
    pub dependencies: Vec<RuleDependency>,
    /// Rule performance impact
    pub performance_impact: PerformanceImpact,
    /// Rule testing history
    pub testing_history: Vec<RuleTestResult>,
    /// Business impact assessment
    pub business_impact: BusinessImpact,
}

/// Validation condition types with comprehensive coverage
#[derive(Debug, Clone)]
pub enum ValidationCondition {
    /// Metric threshold validation
    MetricThreshold {
        metric: String,
        threshold: f64,
        operator: ComparisonOperator,
        tolerance: f64,
        window_size: usize,
    },
    /// Performance regression detection
    PerformanceRegression {
        threshold: f32,
        baseline_window: Duration,
        sensitivity: f32,
    },
    /// Resource exhaustion prevention
    ResourceExhaustion {
        resource: String,
        threshold: f32,
        prediction_horizon: Duration,
    },
    /// System stability checking
    StabilityCheck {
        duration: Duration,
        tolerance: f32,
        stability_metrics: Vec<String>,
    },
    /// Safety constraint enforcement
    SafetyConstraint {
        constraint: String,
        value: f64,
        margin: f64,
    },
    /// Business rule validation
    BusinessRule {
        rule_name: String,
        parameters: HashMap<String, f64>,
    },
    /// Compliance requirement validation
    ComplianceRequirement {
        regulation: String,
        requirement_id: String,
        parameters: HashMap<String, String>,
    },
    /// Data quality validation
    DataQualityCheck {
        quality_metrics: Vec<String>,
        minimum_quality: f32,
    },
    /// Model accuracy validation
    ModelAccuracyCheck {
        accuracy_threshold: f32,
        confidence_interval: f32,
    },
    /// Security validation condition
    SecurityCheck {
        security_level: SecurityLevel,
        threat_models: Vec<String>,
    },
    /// Composite condition with logical operators
    CompositeCondition {
        operator: LogicalOperator,
        sub_conditions: Vec<ValidationCondition>,
    },
    /// Custom validation condition
    CustomCondition {
        validator_function: String,
        parameters: HashMap<String, String>,
    },
}

/// Validation severity levels with detailed categorization
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum ValidationSeverity {
    /// Informational level
    Info,
    /// Warning level - potential issues
    Warning,
    /// Error level - issues that should be addressed
    Error,
    /// Critical level - major issues requiring immediate attention
    Critical,
    /// Fatal level - issues that prevent system operation
    Fatal,
    /// Emergency level - issues requiring immediate shutdown
    Emergency,
}

/// Validation enforcement actions
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ValidationEnforcement {
    /// Log the validation result
    Log,
    /// Warn but continue execution
    Warn,
    /// Block the operation
    Block,
    /// Rollback to previous state
    Rollback,
    /// Emergency stop all operations
    EmergencyStop,
    /// Graceful degradation
    GracefulDegradation,
    /// Automatic remediation
    AutomaticRemediation,
    /// Escalate to human operator
    EscalateToHuman,
    /// Quarantine the component
    Quarantine,
    /// Switch to safe mode
    SafeMode,
}

/// Validation results with comprehensive information
#[derive(Debug, Clone)]
pub struct ValidationResults {
    /// Overall validation status
    pub status: ValidationStatus,
    /// Aggregate validation score
    pub score: f32,
    /// Detailed rule results
    pub rule_results: HashMap<String, RuleValidationResult>,
    /// Risk assessment results
    pub risk_assessment: RiskAssessment,
    /// Performance impact analysis
    pub performance_impact: PerformanceImpactAnalysis,
    /// Compliance status
    pub compliance_status: ComplianceStatus,
    /// Validation duration
    pub validation_duration: Duration,
    /// Resource usage during validation
    pub resource_usage: ValidationResourceUsage,
    /// Confidence metrics
    pub confidence_metrics: ConfidenceMetrics,
    /// Recommendations for improvement
    pub recommendations: Vec<ValidationRecommendation>,
    /// Validation metadata
    pub metadata: ValidationMetadata,
    /// Statistical significance results
    pub statistical_results: StatisticalValidationResults,
    /// Anomaly detection results
    pub anomaly_results: Vec<ValidationAnomaly>,
}

/// Validation status enumeration
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ValidationStatus {
    /// All validations passed
    Passed,
    /// Some validations failed
    Failed,
    /// Warnings present but not critical
    Warning,
    /// Conditional pass with requirements
    Conditional,
    /// Validation incomplete
    Incomplete,
    /// Validation skipped
    Skipped,
    /// Validation error occurred
    ValidationError,
}

/// Risk assessor with comprehensive risk analysis
#[derive(Debug, Clone)]
pub struct RiskAssessor {
    /// Assessor name and identifier
    pub name: String,
    /// Risk factors being evaluated
    pub risk_factors: Vec<RiskFactor>,
    /// Assessment algorithm configuration
    pub algorithm: RiskAssessmentAlgorithm,
    /// Risk tolerance levels
    pub tolerance: f32,
    /// Historical risk data
    pub historical_data: Vec<RiskDataPoint>,
    /// Risk prediction models
    pub prediction_models: Vec<RiskPredictionModel>,
    /// Risk mitigation strategies
    pub mitigation_strategies: Vec<RiskMitigationStrategy>,
    /// Risk monitoring configuration
    pub monitoring_config: RiskMonitoringConfig,
    /// Escalation procedures
    pub escalation_procedures: Vec<EscalationProcedure>,
    /// Risk reporting configuration
    pub reporting_config: RiskReportingConfig,
}

/// Individual risk factor analysis
#[derive(Debug, Clone)]
pub struct RiskFactor {
    /// Factor name and description
    pub name: String,
    /// Factor weight in overall assessment
    pub weight: f32,
    /// Current risk level
    pub current_level: RiskLevel,
    /// Risk trend analysis
    pub trend: RiskTrend,
    /// Historical risk levels
    pub history: Vec<(Instant, RiskLevel)>,
    /// Factor dependencies
    pub dependencies: Vec<String>,
    /// Mitigation effectiveness
    pub mitigation_effectiveness: f32,
    /// Impact assessment
    pub impact_assessment: ImpactAssessment,
    /// Probability analysis
    pub probability_analysis: ProbabilityAnalysis,
    /// Risk factor metadata
    pub metadata: RiskFactorMetadata,
}

/// Risk levels with detailed categorization
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum RiskLevel {
    /// Very low risk
    VeryLow,
    /// Low risk
    Low,
    /// Medium risk
    Medium,
    /// High risk
    High,
    /// Very high risk
    VeryHigh,
    /// Critical risk requiring immediate attention
    Critical,
    /// Catastrophic risk
    Catastrophic,
}

/// Risk assessment algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiskAssessmentAlgorithm {
    /// Weighted sum approach
    WeightedSum,
    /// Fuzzy logic assessment
    FuzzyLogic,
    /// Bayesian network analysis
    BayesianNetwork,
    /// Monte Carlo simulation
    MonteCarloSimulation,
    /// Expert system assessment
    ExpertSystem,
    /// Machine learning assessment
    MachineLearning,
    /// Multi-criteria decision analysis
    MultiCriteriaAnalysis,
    /// Fault tree analysis
    FaultTreeAnalysis,
    /// Event tree analysis
    EventTreeAnalysis,
    /// HAZOP analysis
    HAZOPAnalysis,
}

/// Comprehensive risk assessment results
#[derive(Debug, Clone)]
pub struct RiskAssessment {
    /// Overall risk level
    pub overall_risk: RiskLevel,
    /// Performance degradation risk
    pub performance_risk: RiskLevel,
    /// Stability risk assessment
    pub stability_risk: RiskLevel,
    /// Resource usage risk
    pub resource_risk: RiskLevel,
    /// Security risk assessment
    pub security_risk: RiskLevel,
    /// Business continuity risk
    pub business_continuity_risk: RiskLevel,
    /// Rollback complexity assessment
    pub rollback_complexity: RollbackComplexity,
    /// Risk mitigation strategies
    pub mitigation_strategies: Vec<String>,
    /// Risk timeline analysis
    pub timeline_analysis: RiskTimelineAnalysis,
    /// Confidence in assessment
    pub assessment_confidence: f32,
    /// Risk factors breakdown
    pub risk_factors_breakdown: HashMap<String, RiskLevel>,
    /// Quantitative risk metrics
    pub quantitative_metrics: QuantitativeRiskMetrics,
}

/// Validation event tracking
#[derive(Debug, Clone)]
pub struct ValidationEvent {
    /// Event timestamp
    pub timestamp: Instant,
    /// Validation target identifier
    pub target: String,
    /// Event type
    pub event_type: ValidationEventType,
    /// Event severity
    pub severity: ValidationSeverity,
    /// Event details
    pub details: String,
    /// Associated rules
    pub rules: Vec<String>,
    /// Event context
    pub context: HashMap<String, String>,
    /// Performance metrics at event time
    pub performance_metrics: HashMap<String, f64>,
    /// Environmental conditions
    pub environmental_conditions: EnvironmentalConditions,
    /// User information
    pub user_info: UserInfo,
    /// Event correlation ID
    pub correlation_id: String,
    /// Event source
    pub source: EventSource,
}

/// Validator configuration with comprehensive options
#[derive(Debug, Clone)]
pub struct ValidatorConfig {
    /// Enable strict validation mode
    pub strict_validation: bool,
    /// Global validation timeout
    pub timeout: Duration,
    /// Enable parallel validation
    pub parallel_validation: bool,
    /// Maximum concurrent validations
    pub max_concurrent_validations: usize,
    /// Validation retry configuration
    pub retry_config: GlobalRetryConfig,
    /// Caching configuration
    pub cache_config: ValidationCacheConfig,
    /// Logging configuration
    pub logging_config: ValidationLoggingConfig,
    /// Metrics collection configuration
    pub metrics_config: ValidationMetricsConfig,
    /// Alert configuration
    pub alert_config: ValidationAlertConfig,
    /// Security configuration
    pub security_config: ValidationSecurityConfig,
    /// Performance thresholds
    pub performance_thresholds: PerformanceThresholds,
    /// Resource limits
    pub resource_limits: ValidationResourceLimits,
    /// Quality gates configuration
    pub quality_gates: QualityGatesConfig,
    /// Integration configuration
    pub integration_config: IntegrationConfig,
}

/// Compliance framework integration
#[derive(Debug)]
pub struct ComplianceFramework {
    /// Registered compliance standards
    standards: HashMap<String, ComplianceStandard>,
    /// Active regulations
    regulations: Vec<Regulation>,
    /// Compliance policies
    policies: Vec<CompliancePolicy>,
    /// Audit trail manager
    audit_trail: AuditTrailManager,
    /// Compliance reporting system
    reporting_system: ComplianceReportingSystem,
    /// Violation tracking
    violation_tracker: ViolationTracker,
    /// Compliance metrics
    metrics: ComplianceMetrics,
    /// Automated compliance checks
    automated_checks: Vec<AutomatedComplianceCheck>,
}

/// Real-time constraint monitoring
#[derive(Debug)]
pub struct ConstraintMonitor {
    /// Active constraints being monitored
    active_constraints: Vec<Constraint>,
    /// Constraint violation detector
    violation_detector: ConstraintViolationDetector,
    /// Constraint satisfaction checker
    satisfaction_checker: ConstraintSatisfactionChecker,
    /// Constraint optimization engine
    optimization_engine: ConstraintOptimizationEngine,
    /// Constraint dependency analyzer
    dependency_analyzer: ConstraintDependencyAnalyzer,
    /// Constraint performance tracker
    performance_tracker: ConstraintPerformanceTracker,
    /// Constraint alert system
    alert_system: ConstraintAlertSystem,
    /// Constraint adaptation system
    adaptation_system: ConstraintAdaptationSystem,
}

/// Cached validation results for performance
#[derive(Debug, Clone)]
pub struct CachedValidationResult {
    /// Original validation results
    pub results: ValidationResults,
    /// Cache timestamp
    pub cached_at: Instant,
    /// Cache expiry time
    pub expires_at: Instant,
    /// Cache hit count
    pub hit_count: u64,
    /// Cache validity indicators
    pub validity_indicators: Vec<ValidityIndicator>,
    /// Context at caching time
    pub context: HashMap<String, String>,
}

/// Statistical validation framework
#[derive(Debug)]
pub struct StatisticalValidator {
    /// Statistical test registry
    test_registry: StatisticalTestRegistry,
    /// Hypothesis testing framework
    hypothesis_testing: HypothesisTestingFramework,
    /// Confidence interval calculator
    confidence_calculator: ConfidenceIntervalCalculator,
    /// Effect size analyzer
    effect_size_analyzer: EffectSizeAnalyzer,
    /// Power analysis system
    power_analysis: PowerAnalysisSystem,
    /// Multiple comparison correction
    multiple_comparison: MultipleComparisonCorrection,
    /// Bayesian analysis framework
    bayesian_framework: BayesianAnalysisFramework,
    /// Non-parametric testing
    nonparametric_testing: NonParametricTestingFramework,
}

/// A/B testing framework for validation
#[derive(Debug)]
pub struct ABTestingFramework {
    /// Active experiments
    active_experiments: Vec<ABExperiment>,
    /// Experiment designer
    experiment_designer: ExperimentDesigner,
    /// Statistical analysis engine
    analysis_engine: ABTestAnalysisEngine,
    /// Traffic splitter
    traffic_splitter: TrafficSplitter,
    /// Result interpreter
    result_interpreter: ABTestResultInterpreter,
    /// Experiment scheduler
    scheduler: ExperimentScheduler,
    /// Bias detection system
    bias_detector: BiasDetectionSystem,
    /// Power calculation system
    power_calculator: ABTestPowerCalculator,
}

impl OptimizationValidator {
    /// Create a new optimization validator
    pub fn new(config: ValidatorConfig) -> Self {
        Self {
            validation_strategies: Self::initialize_default_strategies(&config),
            validation_rules: Self::initialize_default_rules(&config),
            risk_assessors: Self::initialize_risk_assessors(&config),
            validation_history: VecDeque::new(),
            config: config.clone(),
            compliance_framework: ComplianceFramework::new(&config),
            constraint_monitor: ConstraintMonitor::new(&config),
            result_cache: Arc::new(RwLock::new(HashMap::new())),
            statistical_validator: StatisticalValidator::new(&config),
            ab_testing_framework: ABTestingFramework::new(&config),
            pipeline_orchestrator: ValidationPipelineOrchestrator::new(&config),
            anomaly_detector: ValidationAnomalyDetector::new(&config),
            report_generator: ValidationReportGenerator::new(&config),
            metrics_collector: ValidationMetricsCollector::new(&config),
        }
    }

    /// Validate optimization strategy comprehensively
    pub fn validate_strategy(
        &mut self,
        strategy: &OptimizationStrategy,
        context: &ValidationContext,
    ) -> Result<ValidationResults, ValidationError> {
        let validation_start = Instant::now();

        // Check cache first
        let cache_key = self.generate_cache_key(strategy, context)?;
        if let Some(cached_result) = self.get_cached_result(&cache_key) {
            if self.is_cache_valid(&cached_result, context) {
                return Ok(cached_result.results);
            }
        }

        // Initialize validation session
        let session = ValidationSession::new(strategy, context);

        // Execute validation pipeline
        let mut results = ValidationResults::new();

        // 1. Pre-validation checks
        self.execute_pre_validation_checks(&session, &mut results)?;

        // 2. Rule-based validation
        self.execute_rule_validation(&session, &mut results)?;

        // 3. Risk assessment
        let risk_assessment = self.execute_risk_assessment(&session)?;
        results.risk_assessment = risk_assessment;

        // 4. Statistical validation
        let statistical_results = self.statistical_validator.validate(&session)?;
        results.statistical_results = statistical_results;

        // 5. Compliance validation
        let compliance_status = self.compliance_framework.validate(&session)?;
        results.compliance_status = compliance_status;

        // 6. Constraint validation
        self.constraint_monitor.validate(&session, &mut results)?;

        // 7. Performance validation
        self.execute_performance_validation(&session, &mut results)?;

        // 8. Security validation
        self.execute_security_validation(&session, &mut results)?;

        // 9. A/B testing validation
        if context.enable_ab_testing {
            let ab_results = self.ab_testing_framework.validate(&session)?;
            results.ab_testing_results = Some(ab_results);
        }

        // 10. Anomaly detection
        let anomaly_results = self.anomaly_detector.detect_anomalies(&session, &results)?;
        results.anomaly_results = anomaly_results;

        // Finalize results
        results.validation_duration = validation_start.elapsed();
        results.status = self.determine_overall_status(&results);
        results.score = self.calculate_validation_score(&results);

        // Generate recommendations
        results.recommendations = self.generate_recommendations(&results, &session)?;

        // Cache results
        self.cache_results(&cache_key, &results)?;

        // Record validation event
        self.record_validation_event(&session, &results);

        // Update metrics
        self.metrics_collector.record_validation(&results);

        // Generate alerts if necessary
        self.generate_alerts(&results)?;

        Ok(results)
    }

    /// Validate specific constraint satisfaction
    pub fn validate_constraint(
        &self,
        constraint: &Constraint,
        current_state: &SystemState,
    ) -> Result<ConstraintValidationResult, ValidationError> {
        self.constraint_monitor
            .validate_single_constraint(constraint, current_state)
    }

    /// Assess risk for given optimization strategy
    pub fn assess_risk(
        &self,
        strategy: &OptimizationStrategy,
        context: &RiskAssessmentContext,
    ) -> Result<RiskAssessment, ValidationError> {
        let mut overall_assessment = RiskAssessment::new();

        // Execute all risk assessors
        for assessor in &self.risk_assessors {
            let assessment = assessor.assess_risk(strategy, context)?;
            overall_assessment.merge(assessment);
        }

        // Calculate composite risk scores
        overall_assessment.finalize();

        Ok(overall_assessment)
    }

    /// Execute A/B test for validation strategy
    pub fn execute_ab_test(
        &mut self,
        test_config: ABTestConfig,
    ) -> Result<ABTestResults, ValidationError> {
        self.ab_testing_framework.execute_test(test_config)
    }

    /// Add custom validation rule
    pub fn add_validation_rule(&mut self, rule: ValidationRule) -> Result<(), ValidationError> {
        // Validate the rule itself
        self.validate_rule(&rule)?;

        // Add to active rules
        self.validation_rules.push(rule.clone());

        // Update rule dependencies
        self.update_rule_dependencies(&rule)?;

        Ok(())
    }

    /// Remove validation rule
    pub fn remove_validation_rule(&mut self, rule_id: &str) -> Result<(), ValidationError> {
        self.validation_rules.retain(|rule| rule.id != rule_id);
        self.cleanup_rule_dependencies(rule_id)?;
        Ok(())
    }

    /// Add custom risk assessor
    pub fn add_risk_assessor(&mut self, assessor: RiskAssessor) -> Result<(), ValidationError> {
        self.risk_assessors.push(assessor);
        Ok(())
    }

    /// Get validation history
    pub fn get_validation_history(
        &self,
        filter: Option<ValidationEventFilter>,
    ) -> Vec<&ValidationEvent> {
        match filter {
            Some(f) => self
                .validation_history
                .iter()
                .filter(|event| f.matches(event))
                .collect(),
            None => self.validation_history.iter().collect(),
        }
    }

    /// Generate validation report
    pub fn generate_report(
        &self,
        report_config: ValidationReportConfig,
    ) -> Result<ValidationReport, ValidationError> {
        self.report_generator
            .generate_report(&self.validation_history, report_config)
    }

    /// Get current validation metrics
    pub fn get_validation_metrics(&self) -> ValidationMetrics {
        self.metrics_collector.get_current_metrics()
    }

    /// Update validator configuration
    pub fn update_config(&mut self, new_config: ValidatorConfig) -> Result<(), ValidationError> {
        // Validate configuration
        self.validate_config(&new_config)?;

        // Update configuration
        self.config = new_config;

        // Reinitialize components if necessary
        self.reinitialize_components()?;

        Ok(())
    }

    /// Export validation rules and configuration
    pub fn export_configuration(&self) -> Result<ValidationConfiguration, ValidationError> {
        Ok(ValidationConfiguration {
            rules: self.validation_rules.clone(),
            strategies: self.validation_strategies.clone(),
            risk_assessors: self.risk_assessors.clone(),
            config: self.config.clone(),
            metadata: self.generate_export_metadata(),
        })
    }

    /// Import validation rules and configuration
    pub fn import_configuration(
        &mut self,
        config: ValidationConfiguration,
    ) -> Result<(), ValidationError> {
        // Validate imported configuration
        self.validate_imported_configuration(&config)?;

        // Import rules
        for rule in config.rules {
            self.add_validation_rule(rule)?;
        }

        // Import strategies
        for (name, strategy) in config.strategies {
            self.validation_strategies.insert(name, strategy);
        }

        // Import risk assessors
        for assessor in config.risk_assessors {
            self.add_risk_assessor(assessor)?;
        }

        Ok(())
    }

    // Private implementation methods

    fn initialize_default_strategies(
        config: &ValidatorConfig,
    ) -> HashMap<String, ValidationStrategy> {
        let mut strategies = HashMap::new();

        strategies.insert(
            "comprehensive".to_string(),
            ValidationStrategy {
                name: "comprehensive".to_string(),
                methods: vec![
                    ValidationMethod::StaticAnalysis,
                    ValidationMethod::HistoricalComparison,
                    ValidationMethod::CrossValidation,
                    ValidationMethod::RegressionTesting,
                ],
                priority: ValidationPriority::High,
                timeout: Duration::from_secs(300),
                retry_config: RetryConfig::default(),
                resource_requirements: ResourceRequirements::default(),
                success_criteria: vec![
                    SuccessCriterion::MinimumScore { threshold: 0.8 },
                    SuccessCriterion::NoFatalErrors,
                ],
                failure_handling: FailureHandlingStrategy::Rollback,
                dependencies: Vec::new(),
                context_requirements: ContextRequirements::default(),
                performance_benchmarks: PerformanceBenchmarks::default(),
            },
        );

        strategies.insert(
            "fast".to_string(),
            ValidationStrategy {
                name: "fast".to_string(),
                methods: vec![
                    ValidationMethod::StaticAnalysis,
                    ValidationMethod::HistoricalComparison,
                ],
                priority: ValidationPriority::Medium,
                timeout: Duration::from_secs(60),
                retry_config: RetryConfig::default(),
                resource_requirements: ResourceRequirements::low(),
                success_criteria: vec![SuccessCriterion::MinimumScore { threshold: 0.6 }],
                failure_handling: FailureHandlingStrategy::Warn,
                dependencies: Vec::new(),
                context_requirements: ContextRequirements::minimal(),
                performance_benchmarks: PerformanceBenchmarks::default(),
            },
        );

        strategies.insert(
            "security_focused".to_string(),
            ValidationStrategy {
                name: "security_focused".to_string(),
                methods: vec![
                    ValidationMethod::SecurityValidation,
                    ValidationMethod::ComplianceValidation,
                    ValidationMethod::FormalVerification,
                ],
                priority: ValidationPriority::Critical,
                timeout: Duration::from_secs(600),
                retry_config: RetryConfig::aggressive(),
                resource_requirements: ResourceRequirements::high(),
                success_criteria: vec![
                    SuccessCriterion::SecurityCompliance,
                    SuccessCriterion::NoSecurityViolations,
                ],
                failure_handling: FailureHandlingStrategy::Block,
                dependencies: Vec::new(),
                context_requirements: ContextRequirements::security(),
                performance_benchmarks: PerformanceBenchmarks::security(),
            },
        );

        strategies
    }

    fn initialize_default_rules(config: &ValidatorConfig) -> Vec<ValidationRule> {
        vec![
            ValidationRule {
                id: "performance_regression".to_string(),
                description: "Detect performance regressions".to_string(),
                condition: ValidationCondition::PerformanceRegression {
                    threshold: 0.05,
                    baseline_window: Duration::from_secs(3600),
                    sensitivity: 0.8,
                },
                severity: ValidationSeverity::Error,
                enforcement: ValidationEnforcement::Block,
                category: RuleCategory::Performance,
                version: "1.0".to_string(),
                author: "System".to_string(),
                activation_conditions: Vec::new(),
                exemptions: Vec::new(),
                dependencies: Vec::new(),
                performance_impact: PerformanceImpact::Low,
                testing_history: Vec::new(),
                business_impact: BusinessImpact::Medium,
            },
            ValidationRule {
                id: "memory_exhaustion".to_string(),
                description: "Prevent memory exhaustion".to_string(),
                condition: ValidationCondition::ResourceExhaustion {
                    resource: "memory".to_string(),
                    threshold: 0.9,
                    prediction_horizon: Duration::from_secs(300),
                },
                severity: ValidationSeverity::Critical,
                enforcement: ValidationEnforcement::EmergencyStop,
                category: RuleCategory::Resource,
                version: "1.0".to_string(),
                author: "System".to_string(),
                activation_conditions: Vec::new(),
                exemptions: Vec::new(),
                dependencies: Vec::new(),
                performance_impact: PerformanceImpact::Minimal,
                testing_history: Vec::new(),
                business_impact: BusinessImpact::High,
            },
            ValidationRule {
                id: "stability_check".to_string(),
                description: "Ensure system stability".to_string(),
                condition: ValidationCondition::StabilityCheck {
                    duration: Duration::from_secs(600),
                    tolerance: 0.1,
                    stability_metrics: vec!["latency".to_string(), "throughput".to_string()],
                },
                severity: ValidationSeverity::Warning,
                enforcement: ValidationEnforcement::Warn,
                category: RuleCategory::Stability,
                version: "1.0".to_string(),
                author: "System".to_string(),
                activation_conditions: Vec::new(),
                exemptions: Vec::new(),
                dependencies: Vec::new(),
                performance_impact: PerformanceImpact::Low,
                testing_history: Vec::new(),
                business_impact: BusinessImpact::Medium,
            },
        ]
    }

    fn initialize_risk_assessors(config: &ValidatorConfig) -> Vec<RiskAssessor> {
        vec![RiskAssessor {
            name: "performance_risk".to_string(),
            risk_factors: vec![
                RiskFactor {
                    name: "latency_increase".to_string(),
                    weight: 0.4,
                    current_level: RiskLevel::Low,
                    trend: RiskTrend::Stable,
                    history: Vec::new(),
                    dependencies: Vec::new(),
                    mitigation_effectiveness: 0.8,
                    impact_assessment: ImpactAssessment::default(),
                    probability_analysis: ProbabilityAnalysis::default(),
                    metadata: RiskFactorMetadata::default(),
                },
                RiskFactor {
                    name: "throughput_degradation".to_string(),
                    weight: 0.6,
                    current_level: RiskLevel::Low,
                    trend: RiskTrend::Stable,
                    history: Vec::new(),
                    dependencies: Vec::new(),
                    mitigation_effectiveness: 0.7,
                    impact_assessment: ImpactAssessment::default(),
                    probability_analysis: ProbabilityAnalysis::default(),
                    metadata: RiskFactorMetadata::default(),
                },
            ],
            algorithm: RiskAssessmentAlgorithm::WeightedSum,
            tolerance: 0.3,
            historical_data: Vec::new(),
            prediction_models: Vec::new(),
            mitigation_strategies: Vec::new(),
            monitoring_config: RiskMonitoringConfig::default(),
            escalation_procedures: Vec::new(),
            reporting_config: RiskReportingConfig::default(),
        }]
    }

    fn generate_cache_key(
        &self,
        strategy: &OptimizationStrategy,
        context: &ValidationContext,
    ) -> Result<String, ValidationError> {
        // Generate deterministic cache key
        Ok(format!("{}_{}", strategy.get_hash(), context.get_hash()))
    }

    fn get_cached_result(&self, cache_key: &str) -> Option<CachedValidationResult> {
        let cache = self.result_cache.read().expect("lock should not be poisoned");
        cache.get(cache_key).cloned()
    }

    fn is_cache_valid(
        &self,
        cached_result: &CachedValidationResult,
        context: &ValidationContext,
    ) -> bool {
        // Check if cache is still valid
        cached_result.expires_at > Instant::now()
            && self.validate_cache_context(cached_result, context)
    }

    fn validate_cache_context(
        &self,
        cached_result: &CachedValidationResult,
        context: &ValidationContext,
    ) -> bool {
        // Validate that cache context matches current context
        true // Simplified implementation
    }

    fn execute_pre_validation_checks(
        &self,
        session: &ValidationSession,
        results: &mut ValidationResults,
    ) -> Result<(), ValidationError> {
        // Execute pre-validation checks
        Ok(())
    }

    fn execute_rule_validation(
        &self,
        session: &ValidationSession,
        results: &mut ValidationResults,
    ) -> Result<(), ValidationError> {
        for rule in &self.validation_rules {
            let rule_result = self.evaluate_rule(rule, session)?;
            results.rule_results.insert(rule.id.clone(), rule_result);
        }
        Ok(())
    }

    fn execute_risk_assessment(
        &self,
        session: &ValidationSession,
    ) -> Result<RiskAssessment, ValidationError> {
        let mut overall_assessment = RiskAssessment::new();

        for assessor in &self.risk_assessors {
            let assessment = assessor.assess_risk_for_session(session)?;
            overall_assessment.merge(assessment);
        }

        overall_assessment.finalize();
        Ok(overall_assessment)
    }

    fn execute_performance_validation(
        &self,
        session: &ValidationSession,
        results: &mut ValidationResults,
    ) -> Result<(), ValidationError> {
        // Performance validation logic
        Ok(())
    }

    fn execute_security_validation(
        &self,
        session: &ValidationSession,
        results: &mut ValidationResults,
    ) -> Result<(), ValidationError> {
        // Security validation logic
        Ok(())
    }

    fn determine_overall_status(&self, results: &ValidationResults) -> ValidationStatus {
        // Determine overall validation status based on results
        if results
            .rule_results
            .values()
            .any(|r| r.status == RuleValidationStatus::Fatal)
        {
            ValidationStatus::Failed
        } else if results
            .rule_results
            .values()
            .any(|r| r.status == RuleValidationStatus::Failed)
        {
            ValidationStatus::Failed
        } else if results
            .rule_results
            .values()
            .any(|r| r.status == RuleValidationStatus::Warning)
        {
            ValidationStatus::Warning
        } else {
            ValidationStatus::Passed
        }
    }

    fn calculate_validation_score(&self, results: &ValidationResults) -> f32 {
        // Calculate aggregate validation score
        let mut score = 1.0;

        // Factor in rule results
        let failed_rules = results
            .rule_results
            .values()
            .filter(|r| {
                matches!(
                    r.status,
                    RuleValidationStatus::Failed | RuleValidationStatus::Fatal
                )
            })
            .count();

        score -= (failed_rules as f32) * 0.1;

        // Factor in risk assessment
        match results.risk_assessment.overall_risk {
            RiskLevel::VeryLow => score *= 1.0,
            RiskLevel::Low => score *= 0.95,
            RiskLevel::Medium => score *= 0.8,
            RiskLevel::High => score *= 0.6,
            RiskLevel::VeryHigh => score *= 0.4,
            RiskLevel::Critical => score *= 0.2,
            RiskLevel::Catastrophic => score *= 0.1,
        }

        score.clamp(0.0, 1.0)
    }

    fn generate_recommendations(
        &self,
        results: &ValidationResults,
        session: &ValidationSession,
    ) -> Result<Vec<ValidationRecommendation>, ValidationError> {
        let mut recommendations = Vec::new();

        // Generate recommendations based on results
        if results.score < 0.8 {
            recommendations.push(ValidationRecommendation {
                priority: RecommendationPriority::High,
                category: RecommendationCategory::Performance,
                title: "Improve validation score".to_string(),
                description: "The validation score is below acceptable threshold".to_string(),
                actions: vec![
                    "Review failed rules".to_string(),
                    "Address risk factors".to_string(),
                ],
                impact: RecommendationImpact::High,
                effort: RecommendationEffort::Medium,
                timeline: RecommendationTimeline::Short,
            });
        }

        Ok(recommendations)
    }

    fn cache_results(
        &mut self,
        cache_key: &str,
        results: &ValidationResults,
    ) -> Result<(), ValidationError> {
        let cached_result = CachedValidationResult {
            results: results.clone(),
            cached_at: Instant::now(),
            expires_at: Instant::now() + Duration::from_secs(300),
            hit_count: 0,
            validity_indicators: Vec::new(),
            context: HashMap::new(),
        };

        let mut cache = self.result_cache.write().expect("lock should not be poisoned");
        cache.insert(cache_key.to_string(), cached_result);

        Ok(())
    }

    fn record_validation_event(
        &mut self,
        session: &ValidationSession,
        results: &ValidationResults,
    ) {
        let event = ValidationEvent {
            timestamp: Instant::now(),
            target: session.strategy.name.clone(),
            event_type: ValidationEventType::ValidationCompleted,
            severity: self.map_status_to_severity(results.status),
            details: format!("Validation completed with score: {}", results.score),
            rules: self.validation_rules.iter().map(|r| r.id.clone()).collect(),
            context: HashMap::new(),
            performance_metrics: HashMap::new(),
            environmental_conditions: EnvironmentalConditions::default(),
            user_info: UserInfo::default(),
            correlation_id: session.correlation_id.clone(),
            source: EventSource::Validator,
        };

        self.validation_history.push_back(event);

        // Limit history size
        if self.validation_history.len() > 10000 {
            self.validation_history.pop_front();
        }
    }

    fn generate_alerts(&self, results: &ValidationResults) -> Result<(), ValidationError> {
        // Generate alerts based on results
        if results.status == ValidationStatus::Failed {
            // Generate high priority alert
        }

        Ok(())
    }

    fn evaluate_rule(
        &self,
        rule: &ValidationRule,
        session: &ValidationSession,
    ) -> Result<RuleValidationResult, ValidationError> {
        // Evaluate individual validation rule
        Ok(RuleValidationResult {
            rule_id: rule.id.clone(),
            status: RuleValidationStatus::Passed,
            score: 1.0,
            details: "Rule passed".to_string(),
            evidence: Vec::new(),
            recommendations: Vec::new(),
            execution_time: Duration::from_millis(10),
            resource_usage: RuleResourceUsage::default(),
        })
    }

    fn validate_rule(&self, rule: &ValidationRule) -> Result<(), ValidationError> {
        // Validate that the rule is well-formed
        if rule.id.is_empty() {
            return Err(ValidationError::InvalidRule(
                "Rule ID cannot be empty".to_string(),
            ));
        }

        Ok(())
    }

    fn update_rule_dependencies(&mut self, rule: &ValidationRule) -> Result<(), ValidationError> {
        // Update rule dependency graph
        Ok(())
    }

    fn cleanup_rule_dependencies(&mut self, rule_id: &str) -> Result<(), ValidationError> {
        // Clean up rule dependencies
        Ok(())
    }

    fn validate_config(&self, config: &ValidatorConfig) -> Result<(), ValidationError> {
        // Validate configuration
        Ok(())
    }

    fn reinitialize_components(&mut self) -> Result<(), ValidationError> {
        // Reinitialize components with new configuration
        Ok(())
    }

    fn generate_export_metadata(&self) -> ValidationMetadata {
        ValidationMetadata::default()
    }

    fn validate_imported_configuration(
        &self,
        config: &ValidationConfiguration,
    ) -> Result<(), ValidationError> {
        // Validate imported configuration
        Ok(())
    }

    fn map_status_to_severity(&self, status: ValidationStatus) -> ValidationSeverity {
        match status {
            ValidationStatus::Passed => ValidationSeverity::Info,
            ValidationStatus::Warning => ValidationSeverity::Warning,
            ValidationStatus::Failed => ValidationSeverity::Error,
            ValidationStatus::Conditional => ValidationSeverity::Warning,
            ValidationStatus::Incomplete => ValidationSeverity::Warning,
            ValidationStatus::Skipped => ValidationSeverity::Info,
            ValidationStatus::ValidationError => ValidationSeverity::Error,
        }
    }
}

// Default implementations and supporting structures

impl Default for ValidatorConfig {
    fn default() -> Self {
        Self {
            strict_validation: true,
            timeout: Duration::from_secs(120),
            parallel_validation: true,
            max_concurrent_validations: 10,
            retry_config: GlobalRetryConfig::default(),
            cache_config: ValidationCacheConfig::default(),
            logging_config: ValidationLoggingConfig::default(),
            metrics_config: ValidationMetricsConfig::default(),
            alert_config: ValidationAlertConfig::default(),
            security_config: ValidationSecurityConfig::default(),
            performance_thresholds: PerformanceThresholds::default(),
            resource_limits: ValidationResourceLimits::default(),
            quality_gates: QualityGatesConfig::default(),
            integration_config: IntegrationConfig::default(),
        }
    }
}

impl ValidationResults {
    fn new() -> Self {
        Self {
            status: ValidationStatus::Incomplete,
            score: 0.0,
            rule_results: HashMap::new(),
            risk_assessment: RiskAssessment::new(),
            performance_impact: PerformanceImpactAnalysis::default(),
            compliance_status: ComplianceStatus::default(),
            validation_duration: Duration::from_secs(0),
            resource_usage: ValidationResourceUsage::default(),
            confidence_metrics: ConfidenceMetrics::default(),
            recommendations: Vec::new(),
            metadata: ValidationMetadata::default(),
            statistical_results: StatisticalValidationResults::default(),
            anomaly_results: Vec::new(),
            ab_testing_results: None,
        }
    }
}

impl RiskAssessment {
    fn new() -> Self {
        Self {
            overall_risk: RiskLevel::Low,
            performance_risk: RiskLevel::Low,
            stability_risk: RiskLevel::Low,
            resource_risk: RiskLevel::Low,
            security_risk: RiskLevel::Low,
            business_continuity_risk: RiskLevel::Low,
            rollback_complexity: RollbackComplexity::Simple,
            mitigation_strategies: Vec::new(),
            timeline_analysis: RiskTimelineAnalysis::default(),
            assessment_confidence: 0.8,
            risk_factors_breakdown: HashMap::new(),
            quantitative_metrics: QuantitativeRiskMetrics::default(),
        }
    }

    fn merge(&mut self, other: RiskAssessment) {
        // Merge risk assessments
        self.overall_risk = self.overall_risk.max(other.overall_risk);
        self.performance_risk = self.performance_risk.max(other.performance_risk);
        self.stability_risk = self.stability_risk.max(other.stability_risk);
        self.resource_risk = self.resource_risk.max(other.resource_risk);
        self.security_risk = self.security_risk.max(other.security_risk);
        self.business_continuity_risk = self
            .business_continuity_risk
            .max(other.business_continuity_risk);
    }

    fn finalize(&mut self) {
        // Finalize the assessment
        self.overall_risk = [
            self.performance_risk,
            self.stability_risk,
            self.resource_risk,
            self.security_risk,
            self.business_continuity_risk,
        ]
        .iter()
        .max()
        .copied()
        .unwrap_or(RiskLevel::Low);
    }
}

// Placeholder implementations for compilation
impl RiskAssessor {
    fn assess_risk_for_session(
        &self,
        session: &ValidationSession,
    ) -> Result<RiskAssessment, ValidationError> {
        Ok(RiskAssessment::new())
    }
}

impl ComplianceFramework {
    fn new(config: &ValidatorConfig) -> Self {
        Self {
            standards: HashMap::new(),
            regulations: Vec::new(),
            policies: Vec::new(),
            audit_trail: AuditTrailManager::default(),
            reporting_system: ComplianceReportingSystem::default(),
            violation_tracker: ViolationTracker::default(),
            metrics: ComplianceMetrics::default(),
            automated_checks: Vec::new(),
        }
    }

    fn validate(&self, session: &ValidationSession) -> Result<ComplianceStatus, ValidationError> {
        Ok(ComplianceStatus::default())
    }
}

impl ConstraintMonitor {
    fn new(config: &ValidatorConfig) -> Self {
        Self {
            active_constraints: Vec::new(),
            violation_detector: ConstraintViolationDetector::default(),
            satisfaction_checker: ConstraintSatisfactionChecker::default(),
            optimization_engine: ConstraintOptimizationEngine::default(),
            dependency_analyzer: ConstraintDependencyAnalyzer::default(),
            performance_tracker: ConstraintPerformanceTracker::default(),
            alert_system: ConstraintAlertSystem::default(),
            adaptation_system: ConstraintAdaptationSystem::default(),
        }
    }

    fn validate(
        &self,
        session: &ValidationSession,
        results: &mut ValidationResults,
    ) -> Result<(), ValidationError> {
        Ok(())
    }

    fn validate_single_constraint(
        &self,
        constraint: &Constraint,
        state: &SystemState,
    ) -> Result<ConstraintValidationResult, ValidationError> {
        Ok(ConstraintValidationResult::default())
    }
}

// Additional placeholder structures for compilation
#[derive(Debug)]
pub struct ValidationSession {
    pub strategy: OptimizationStrategy,
    pub context: ValidationContext,
    pub correlation_id: String,
}

impl ValidationSession {
    fn new(strategy: &OptimizationStrategy, context: &ValidationContext) -> Self {
        Self {
            strategy: strategy.clone(),
            context: context.clone(),
            correlation_id: uuid::Uuid::new_v4().to_string(),
        }
    }
}

// Comprehensive validation error types
#[derive(Debug)]
pub enum ValidationError {
    InvalidRule(String),
    RuleEvaluationFailed(String),
    RiskAssessmentFailed(String),
    ComplianceCheckFailed(String),
    ConstraintViolation(String),
    ConfigurationError(String),
    CacheError(String),
    StatisticalValidationError(String),
    ABTestingError(String),
    ReportGenerationError(String),
    MetricsError(String),
    SecurityValidationError(String),
    TimeoutError(String),
    ResourceExhausted(String),
    ValidationTimeout,
    InsufficientData,
    InvalidContext,
    SystemError(String),
}

impl std::fmt::Display for ValidationError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            ValidationError::InvalidRule(msg) => write!(f, "Invalid validation rule: {}", msg),
            ValidationError::RuleEvaluationFailed(msg) => {
                write!(f, "Rule evaluation failed: {}", msg)
            }
            ValidationError::RiskAssessmentFailed(msg) => {
                write!(f, "Risk assessment failed: {}", msg)
            }
            ValidationError::ComplianceCheckFailed(msg) => {
                write!(f, "Compliance check failed: {}", msg)
            }
            ValidationError::ConstraintViolation(msg) => write!(f, "Constraint violation: {}", msg),
            ValidationError::ConfigurationError(msg) => write!(f, "Configuration error: {}", msg),
            ValidationError::CacheError(msg) => write!(f, "Cache error: {}", msg),
            ValidationError::StatisticalValidationError(msg) => {
                write!(f, "Statistical validation error: {}", msg)
            }
            ValidationError::ABTestingError(msg) => write!(f, "A/B testing error: {}", msg),
            ValidationError::ReportGenerationError(msg) => {
                write!(f, "Report generation error: {}", msg)
            }
            ValidationError::MetricsError(msg) => write!(f, "Metrics error: {}", msg),
            ValidationError::SecurityValidationError(msg) => {
                write!(f, "Security validation error: {}", msg)
            }
            ValidationError::TimeoutError(msg) => write!(f, "Timeout error: {}", msg),
            ValidationError::ResourceExhausted(msg) => write!(f, "Resource exhausted: {}", msg),
            ValidationError::ValidationTimeout => write!(f, "Validation timeout"),
            ValidationError::InsufficientData => write!(f, "Insufficient data for validation"),
            ValidationError::InvalidContext => write!(f, "Invalid validation context"),
            ValidationError::SystemError(msg) => write!(f, "System error: {}", msg),
        }
    }
}

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

// Placeholder implementations for all required structures
// (Due to space constraints, showing abbreviated versions)

#[derive(Debug, Default, Clone)]
pub struct OptimizationStrategy {
    pub name: String,
}

impl OptimizationStrategy {
    fn get_hash(&self) -> String {
        "hash".to_string()
    }
}

#[derive(Debug, Default, Clone)]
pub struct ValidationContext {
    pub enable_ab_testing: bool,
}

impl ValidationContext {
    fn get_hash(&self) -> String {
        "context_hash".to_string()
    }
}

#[derive(Debug, Default)]
pub struct ValidationPipelineOrchestrator;

impl ValidationPipelineOrchestrator {
    fn new(config: &ValidatorConfig) -> Self {
        Self
    }
}

#[derive(Debug, Default)]
pub struct ValidationAnomalyDetector;

impl ValidationAnomalyDetector {
    fn new(config: &ValidatorConfig) -> Self {
        Self
    }
    fn detect_anomalies(
        &self,
        session: &ValidationSession,
        results: &ValidationResults,
    ) -> Result<Vec<ValidationAnomaly>, ValidationError> {
        Ok(Vec::new())
    }
}

#[derive(Debug, Default)]
pub struct ValidationReportGenerator;

impl ValidationReportGenerator {
    fn new(config: &ValidatorConfig) -> Self {
        Self
    }
    fn generate_report(
        &self,
        history: &VecDeque<ValidationEvent>,
        config: ValidationReportConfig,
    ) -> Result<ValidationReport, ValidationError> {
        Ok(ValidationReport::default())
    }
}

#[derive(Debug, Default)]
pub struct ValidationMetricsCollector;

impl ValidationMetricsCollector {
    fn new(config: &ValidatorConfig) -> Self {
        Self
    }
    fn record_validation(&self, results: &ValidationResults) {}
    fn get_current_metrics(&self) -> ValidationMetrics {
        ValidationMetrics::default()
    }
}

// Additional placeholder structures (abbreviated for space)
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
pub struct ValidationPriority;
#[derive(Debug, Default, Clone)]
pub struct RetryConfig;
#[derive(Debug, Default, Clone)]
pub struct ResourceRequirements;
#[derive(Debug, Default, Clone)]
pub struct SuccessCriterion;
#[derive(Debug, Default, Clone, Copy)]
pub struct FailureHandlingStrategy;
#[derive(Debug, Default, Clone)]
pub struct ContextRequirements;
#[derive(Debug, Default, Clone)]
pub struct PerformanceBenchmarks;
#[derive(Debug, Default, Clone, Copy)]
pub struct RuleCategory;
#[derive(Debug, Default, Clone)]
pub struct ActivationCondition;
#[derive(Debug, Default, Clone)]
pub struct ExemptionCondition;
#[derive(Debug, Default, Clone)]
pub struct RuleDependency;
#[derive(Debug, Default, Clone, Copy)]
pub struct PerformanceImpact;
#[derive(Debug, Default, Clone)]
pub struct RuleTestResult;
#[derive(Debug, Default, Clone, Copy)]
pub struct BusinessImpact;
#[derive(Debug, Default, Clone)]
pub struct RuleValidationResult;
#[derive(Debug, Default, Clone, Copy)]
pub struct RuleValidationStatus;
#[derive(Debug, Default, Clone)]
pub struct RiskDataPoint;
#[derive(Debug, Default, Clone)]
pub struct RiskPredictionModel;
#[derive(Debug, Default, Clone)]
pub struct RiskMitigationStrategy;
#[derive(Debug, Default, Clone)]
pub struct RiskMonitoringConfig;
#[derive(Debug, Default, Clone)]
pub struct EscalationProcedure;
#[derive(Debug, Default, Clone)]
pub struct RiskReportingConfig;
#[derive(Debug, Default, Clone, Copy)]
pub struct RiskTrend;
#[derive(Debug, Default, Clone)]
pub struct ImpactAssessment;
#[derive(Debug, Default, Clone)]
pub struct ProbabilityAnalysis;
#[derive(Debug, Default, Clone)]
pub struct RiskFactorMetadata;
#[derive(Debug, Default, Clone, Copy)]
pub struct RollbackComplexity;
#[derive(Debug, Default, Clone)]
pub struct RiskTimelineAnalysis;
#[derive(Debug, Default, Clone)]
pub struct QuantitativeRiskMetrics;
#[derive(Debug, Default, Clone, Copy)]
pub struct ValidationEventType;
#[derive(Debug, Default, Clone)]
pub struct EnvironmentalConditions;
#[derive(Debug, Default, Clone)]
pub struct UserInfo;
#[derive(Debug, Default, Clone, Copy)]
pub struct EventSource;
#[derive(Debug, Default, Clone)]
pub struct GlobalRetryConfig;
#[derive(Debug, Default, Clone)]
pub struct ValidationCacheConfig;
#[derive(Debug, Default, Clone)]
pub struct ValidationLoggingConfig;
#[derive(Debug, Default, Clone)]
pub struct ValidationMetricsConfig;
#[derive(Debug, Default, Clone)]
pub struct ValidationAlertConfig;
#[derive(Debug, Default, Clone)]
pub struct ValidationSecurityConfig;
#[derive(Debug, Default, Clone)]
pub struct PerformanceThresholds;
#[derive(Debug, Default, Clone)]
pub struct ValidationResourceLimits;
#[derive(Debug, Default, Clone)]
pub struct QualityGatesConfig;
#[derive(Debug, Default, Clone)]
pub struct IntegrationConfig;
#[derive(Debug, Default)]
pub struct ComplianceStandard;
#[derive(Debug, Default)]
pub struct Regulation;
#[derive(Debug, Default)]
pub struct CompliancePolicy;
#[derive(Debug, Default)]
pub struct AuditTrailManager;
#[derive(Debug, Default)]
pub struct ComplianceReportingSystem;
#[derive(Debug, Default)]
pub struct ViolationTracker;
#[derive(Debug, Default)]
pub struct ComplianceMetrics;
#[derive(Debug, Default)]
pub struct AutomatedComplianceCheck;
#[derive(Debug, Default)]
pub struct Constraint;
#[derive(Debug, Default)]
pub struct ConstraintViolationDetector;
#[derive(Debug, Default)]
pub struct ConstraintSatisfactionChecker;
#[derive(Debug, Default)]
pub struct ConstraintOptimizationEngine;
#[derive(Debug, Default)]
pub struct ConstraintDependencyAnalyzer;
#[derive(Debug, Default)]
pub struct ConstraintPerformanceTracker;
#[derive(Debug, Default)]
pub struct ConstraintAlertSystem;
#[derive(Debug, Default)]
pub struct ConstraintAdaptationSystem;
#[derive(Debug, Default)]
pub struct ValidityIndicator;
#[derive(Debug, Default)]
pub struct PerformanceImpactAnalysis;
#[derive(Debug, Default)]
pub struct ComplianceStatus;
#[derive(Debug, Default)]
pub struct ValidationResourceUsage;
#[derive(Debug, Default)]
pub struct ConfidenceMetrics;
#[derive(Debug, Default)]
pub struct ValidationRecommendation;
#[derive(Debug, Default)]
pub struct ValidationMetadata;
#[derive(Debug, Default)]
pub struct StatisticalValidationResults;
#[derive(Debug, Default)]
pub struct ValidationAnomaly;
#[derive(Debug, Default)]
pub struct ABTestResults;
#[derive(Debug, Default)]
pub struct RuleResourceUsage;
#[derive(Debug, Default)]
pub struct SystemState;
#[derive(Debug, Default)]
pub struct ConstraintValidationResult;
#[derive(Debug, Default)]
pub struct RiskAssessmentContext;
#[derive(Debug, Default)]
pub struct ABTestConfig;
#[derive(Debug, Default)]
pub struct ValidationEventFilter;
#[derive(Debug, Default)]
pub struct ValidationReportConfig;
#[derive(Debug, Default)]
pub struct ValidationReport;
#[derive(Debug, Default)]
pub struct ValidationMetrics;
#[derive(Debug, Default)]
pub struct ValidationConfiguration;
#[derive(Debug, Default)]
pub struct ComparisonOperator;
#[derive(Debug, Default)]
pub struct SecurityLevel;
#[derive(Debug, Default)]
pub struct LogicalOperator;
#[derive(Debug, Default, Copy, Clone)]
pub struct RecommendationPriority;
#[derive(Debug, Default, Copy, Clone)]
pub struct RecommendationCategory;
#[derive(Debug, Default, Copy, Clone)]
pub struct RecommendationImpact;
#[derive(Debug, Default, Copy, Clone)]
pub struct RecommendationEffort;
#[derive(Debug, Default, Copy, Clone)]
pub struct RecommendationTimeline;

// Additional trait implementations
impl ValidationPriority {
    pub const High: Self = Self;
    pub const Medium: Self = Self;
    pub const Critical: Self = Self;
}

impl SuccessCriterion {
    pub const MinimumScore: fn(f32) -> Self = |_| Self;
    pub const NoFatalErrors: Self = Self;
    pub const SecurityCompliance: Self = Self;
    pub const NoSecurityViolations: Self = Self;
}

impl FailureHandlingStrategy {
    pub const Rollback: Self = Self;
    pub const Warn: Self = Self;
    pub const Block: Self = Self;
}

impl ResourceRequirements {
    fn low() -> Self {
        Self
    }
    fn high() -> Self {
        Self
    }
}

impl ContextRequirements {
    fn minimal() -> Self {
        Self
    }
    fn security() -> Self {
        Self
    }
}

impl PerformanceBenchmarks {
    fn security() -> Self {
        Self
    }
}

impl RetryConfig {
    fn aggressive() -> Self {
        Self
    }
}

impl ValidationEventFilter {
    fn matches(&self, event: &ValidationEvent) -> bool {
        true
    }
}

impl RuleValidationStatus {
    pub const Passed: Self = Self;
    pub const Failed: Self = Self;
    pub const Fatal: Self = Self;
    pub const Warning: Self = Self;
}

impl ValidationEventType {
    pub const ValidationCompleted: Self = Self;
}

impl EventSource {
    pub const Validator: Self = Self;
}

impl RollbackComplexity {
    pub const Simple: Self = Self;
}
