// Pipeline orchestration for multi-stage optimization workflows
//
// This module provides comprehensive pipeline orchestration capabilities for
// managing complex optimization workflows with multiple stages, dependencies,
// and parallel execution paths.

#[allow(dead_code)]
use scirs2_core::ndarray::Array1;
use scirs2_core::numeric::Float;
use std::collections::{HashMap, VecDeque};
use std::fmt::Debug;
use std::time::{Duration, SystemTime};

use crate::error::{OptimError, Result};

/// Pipeline orchestrator for optimization workflows
#[derive(Debug)]
pub struct PipelineOrchestrator<T: Float + Debug + Send + Sync + 'static> {
    /// Active pipelines
    active_pipelines: HashMap<String, PipelineExecution<T>>,

    /// Pipeline templates
    pipeline_templates: HashMap<String, OptimizationPipeline<T>>,

    /// Execution scheduler
    scheduler: PipelineScheduler<T>,

    /// Dependency resolver
    dependency_resolver: DependencyResolver<T>,

    /// Resource coordinator
    resource_coordinator: PipelineResourceCoordinator<T>,

    /// Pipeline monitor
    monitor: PipelineMonitor<T>,

    /// Error handler
    error_handler: PipelineErrorHandler<T>,

    /// Orchestrator configuration
    config: OrchestratorConfiguration<T>,

    /// Execution statistics
    stats: PipelineStatistics<T>,
}

/// Optimization pipeline definition
#[derive(Debug, Clone)]
pub struct OptimizationPipeline<T: Float + Debug + Send + Sync + 'static> {
    /// Pipeline identifier
    pub pipeline_id: String,

    /// Pipeline name
    pub name: String,

    /// Pipeline description
    pub description: String,

    /// Pipeline stages
    pub stages: Vec<PipelineStage<T>>,

    /// Stage dependencies
    pub dependencies: HashMap<String, Vec<String>>,

    /// Pipeline configuration
    pub configuration: PipelineConfiguration<T>,

    /// Global parameters
    pub global_parameters: HashMap<String, T>,

    /// Pipeline metadata
    pub metadata: PipelineMetadata,

    /// Pipeline version
    pub version: String,
}

/// Pipeline stage definition
#[derive(Debug, Clone)]
pub struct PipelineStage<T: Float + Debug + Send + Sync + 'static> {
    /// Stage identifier
    pub stage_id: String,

    /// Stage name
    pub name: String,

    /// Stage type
    pub stage_type: StageType,

    /// Stage configuration
    pub configuration: StageConfiguration<T>,

    /// Input specifications
    pub input_specs: Vec<DataSpecification>,

    /// Output specifications
    pub output_specs: Vec<DataSpecification>,

    /// Resource requirements
    pub resource_requirements: StageResourceRequirements,

    /// Execution constraints
    pub constraints: StageConstraints<T>,

    /// Error handling policy
    pub error_policy: ErrorHandlingPolicy,

    /// Stage metadata
    pub metadata: HashMap<String, String>,
}

impl<T: Float + Debug + Send + Sync + 'static> PipelineStage<T> {
    /// Create a new pipeline stage with default values
    pub fn new(name: String) -> Self {
        use uuid::Uuid;

        Self {
            stage_id: Uuid::new_v4().to_string(),
            name: name.clone(),
            stage_type: StageType::Custom(name),
            configuration: StageConfiguration {
                parameters: HashMap::new(),
                options: HashMap::new(),
                resources: HashMap::new(),
            },
            input_specs: Vec::new(),
            output_specs: Vec::new(),
            resource_requirements: StageResourceRequirements {
                cpu_cores: 1,
                memory_mb: 1024,
                gpu_devices: 0,
                storage_gb: 1,
                network_mbps: 1.0,
                custom_resources: HashMap::new(),
            },
            constraints: StageConstraints {
                timeout: Some(std::time::Duration::from_secs(3600)),
                max_retries: 3,
                dependencies: Vec::new(),
                conditions: Vec::new(),
                thresholds: HashMap::new(),
            },
            error_policy: ErrorHandlingPolicy::Retry,
            metadata: HashMap::new(),
        }
    }
}

/// Types of pipeline stages
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum StageType {
    /// Data preprocessing stage
    DataPreprocessing,

    /// Model training stage
    ModelTraining,

    /// Hyperparameter optimization stage
    HyperparameterOptimization,

    /// Architecture search stage
    ArchitectureSearch,

    /// Model evaluation stage
    ModelEvaluation,

    /// Ensemble creation stage
    EnsembleCreation,

    /// Model deployment stage
    ModelDeployment,

    /// Custom stage
    Custom(String),
}

/// Pipeline execution state
#[derive(Debug)]
pub struct PipelineExecution<T: Float + Debug + Send + Sync + 'static> {
    /// Execution identifier
    pub execution_id: String,

    /// Pipeline being executed
    pub pipeline: OptimizationPipeline<T>,

    /// Current execution state
    pub state: ExecutionState,

    /// Stage executions
    pub stage_executions: HashMap<String, StageExecution<T>>,

    /// Execution timeline
    pub timeline: ExecutionTimeline,

    /// Resource allocations
    pub resource_allocations: HashMap<String, ResourceAllocation>,

    /// Execution context
    pub context: ExecutionContext<T>,

    /// Results collector
    pub results: ExecutionResults<T>,

    /// Error tracker
    pub errors: ErrorTracker<T>,
}

/// Pipeline execution state
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ExecutionState {
    /// Execution is pending
    Pending,

    /// Execution is running
    Running,

    /// Execution is paused
    Paused,

    /// Execution completed successfully
    Completed,

    /// Execution failed
    Failed,

    /// Execution was cancelled
    Cancelled,

    /// Execution is being recovered
    Recovering,
}

/// Stage execution state
#[derive(Debug)]
pub struct StageExecution<T: Float + Debug + Send + Sync + 'static> {
    /// Stage being executed
    pub stage: PipelineStage<T>,

    /// Execution state
    pub state: ExecutionState,

    /// Start time
    pub start_time: Option<SystemTime>,

    /// End time
    pub end_time: Option<SystemTime>,

    /// Progress indicator (0.0 to 1.0)
    pub progress: T,

    /// Stage results
    pub results: StageResult<T>,

    /// Resource usage
    pub resource_usage: StageResourceUsage<T>,

    /// Performance metrics
    pub metrics: StageMetrics<T>,

    /// Error information
    pub error_info: Option<String>,
}

/// Stage execution result
#[derive(Debug, Clone)]
pub struct StageResult<T: Float + Debug + Send + Sync + 'static> {
    /// Result status
    pub status: ResultStatus,

    /// Output data
    pub outputs: HashMap<String, StageOutput<T>>,

    /// Performance metrics
    pub performance_metrics: HashMap<String, T>,

    /// Quality metrics
    pub quality_metrics: HashMap<String, T>,

    /// Artifacts produced
    pub artifacts: Vec<Artifact>,

    /// Stage summary
    pub summary: String,

    /// Execution duration
    pub duration: Duration,
}

/// Result status
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ResultStatus {
    Success,
    Warning,
    Failure,
    Partial,
    Skipped,
}

/// Stage output data
#[derive(Debug, Clone)]
pub struct StageOutput<T: Float + Debug + Send + Sync + 'static> {
    /// Output identifier
    pub output_id: String,

    /// Output type
    pub output_type: OutputType,

    /// Data content
    pub data: OutputData<T>,

    /// Data format
    pub format: DataFormat,

    /// Output metadata
    pub metadata: HashMap<String, String>,

    /// Data validation result
    pub validation: ValidationResult,
}

/// Types of stage outputs
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum OutputType {
    /// Model parameters
    ModelParameters,

    /// Training metrics
    TrainingMetrics,

    /// Evaluation results
    EvaluationResults,

    /// Hyperparameters
    Hyperparameters,

    /// Architecture specification
    ArchitectureSpec,

    /// Dataset
    Dataset,

    /// Intermediate results
    IntermediateResults,

    /// Final model
    FinalModel,
}

/// Output data container
#[derive(Debug, Clone)]
pub enum OutputData<T: Float + Debug + Send + Sync + 'static> {
    /// Numerical array data
    Array(Array1<T>),

    /// Key-value data
    KeyValue(HashMap<String, T>),

    /// Structured data
    Structured(StructuredData<T>),

    /// Binary data
    Binary(Vec<u8>),

    /// Text data
    Text(String),

    /// Reference to external data
    Reference(String),
}

/// Structured data representation
#[derive(Debug, Clone)]
pub struct StructuredData<T: Float + Debug + Send + Sync + 'static> {
    /// Data schema
    pub schema: DataSchema,

    /// Data records
    pub records: Vec<HashMap<String, DataValue<T>>>,

    /// Schema version
    pub version: String,
}

/// Data schema definition
#[derive(Debug, Clone)]
pub struct DataSchema {
    /// Schema fields
    pub fields: Vec<SchemaField>,

    /// Schema constraints
    pub constraints: Vec<SchemaConstraint>,

    /// Schema metadata
    pub metadata: HashMap<String, String>,
}

/// Schema field definition
#[derive(Debug, Clone)]
pub struct SchemaField {
    /// Field name
    pub name: String,

    /// Field type
    pub field_type: FieldType,

    /// Field constraints
    pub constraints: Vec<FieldConstraint>,

    /// Optional field
    pub optional: bool,
}

/// Data field types
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum FieldType {
    Integer,
    Float,
    String,
    Boolean,
    Array,
    Object,
    Binary,
}

/// Field constraints
#[derive(Debug, Clone)]
pub enum FieldConstraint {
    /// Minimum value
    MinValue(f64),

    /// Maximum value
    MaxValue(f64),

    /// Required field
    Required,

    /// Unique values
    Unique,

    /// Pattern matching
    Pattern(String),

    /// Custom validation
    Custom(String),
}

/// Schema constraints
#[derive(Debug, Clone)]
pub enum SchemaConstraint {
    /// Referential integrity
    ReferentialIntegrity(String, String),

    /// Uniqueness constraint
    Uniqueness(Vec<String>),

    /// Business rule
    BusinessRule(String),
}

/// Data value representation
#[derive(Debug, Clone)]
pub enum DataValue<T: Float + Debug + Send + Sync + 'static> {
    Integer(i64),
    Float(T),
    String(String),
    Boolean(bool),
    Array(Vec<DataValue<T>>),
    Object(HashMap<String, DataValue<T>>),
    Binary(Vec<u8>),
    Null,
}

/// Data format specification
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum DataFormat {
    JSON,
    XML,
    CSV,
    Binary,
    HDF5,
    Parquet,
    NumPy,
    Pickle,
    Custom(u8),
}

/// Validation result
#[derive(Debug, Clone)]
pub struct ValidationResult {
    /// Validation status
    pub valid: bool,

    /// Validation errors
    pub errors: Vec<String>,

    /// Validation warnings
    pub warnings: Vec<String>,

    /// Validation metadata
    pub metadata: HashMap<String, String>,
}

/// Artifact produced by stage
#[derive(Debug, Clone)]
pub struct Artifact {
    /// Artifact identifier
    pub artifact_id: String,

    /// Artifact type
    pub artifact_type: ArtifactType,

    /// Artifact location
    pub location: String,

    /// Artifact size (bytes)
    pub size: usize,

    /// Creation timestamp
    pub created_at: SystemTime,

    /// Artifact metadata
    pub metadata: HashMap<String, String>,
}

/// Types of artifacts
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ArtifactType {
    /// Trained model
    Model,

    /// Training log
    Log,

    /// Visualization
    Visualization,

    /// Report
    Report,

    /// Checkpoint
    Checkpoint,

    /// Configuration
    Configuration,

    /// Dataset
    Dataset,

    /// Custom artifact
    Custom,
}

/// Pipeline configuration
#[derive(Debug, Clone)]
pub struct PipelineConfiguration<T: Float + Debug + Send + Sync + 'static> {
    /// Execution mode
    pub execution_mode: ExecutionMode,

    /// Parallelism settings
    pub parallelism: ParallelismSettings,

    /// Resource limits
    pub resource_limits: ResourceLimits<T>,

    /// Timeout settings
    pub timeouts: TimeoutSettings,

    /// Retry policies
    pub retry_policies: HashMap<String, RetryPolicy>,

    /// Checkpoint settings
    pub checkpoint_settings: CheckpointSettings<T>,

    /// Monitoring configuration
    pub monitoring: MonitoringConfiguration<T>,

    /// Security settings
    pub security: SecuritySettings,
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for PipelineConfiguration<T> {
    fn default() -> Self {
        Self {
            execution_mode: ExecutionMode::Sequential,
            parallelism: ParallelismSettings::default(),
            resource_limits: ResourceLimits::default(),
            timeouts: TimeoutSettings::default(),
            retry_policies: HashMap::new(),
            checkpoint_settings: CheckpointSettings::default(),
            monitoring: MonitoringConfiguration::default(),
            security: SecuritySettings::default(),
        }
    }
}

/// Execution modes
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ExecutionMode {
    /// Sequential execution
    Sequential,

    /// Parallel execution
    Parallel,

    /// Hybrid execution
    Hybrid,

    /// Distributed execution
    Distributed,

    /// Stream processing
    Streaming,
}

/// Parallelism settings
#[derive(Debug, Clone)]
pub struct ParallelismSettings {
    /// Maximum parallel stages
    pub max_parallel_stages: usize,

    /// Stage-level parallelism
    pub stage_parallelism: HashMap<String, usize>,

    /// Thread pool configuration
    pub thread_pool_config: ThreadPoolConfig,

    /// Load balancing strategy
    pub load_balancing: LoadBalancingStrategy,
}

/// Thread pool configuration
#[derive(Debug, Clone)]
pub struct ThreadPoolConfig {
    /// Core pool size
    pub core_pool_size: usize,

    /// Maximum pool size
    pub max_pool_size: usize,

    /// Keep alive time
    pub keep_alive_time: Duration,

    /// Queue capacity
    pub queue_capacity: usize,
}

/// Load balancing strategies
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum LoadBalancingStrategy {
    RoundRobin,
    LeastLoaded,
    ResourceAware,
    PerformanceBased,
    Custom,
}

/// Resource limits for pipeline
#[derive(Debug, Clone)]
pub struct ResourceLimits<T: Float + Debug + Send + Sync + 'static> {
    /// Maximum CPU usage
    pub max_cpu: T,

    /// Maximum memory usage (MB)
    pub max_memory_mb: usize,

    /// Maximum GPU usage
    pub max_gpu: T,

    /// Maximum storage usage (GB)
    pub max_storage_gb: usize,

    /// Maximum network bandwidth (Mbps)
    pub max_network_mbps: f64,

    /// Custom resource limits
    pub custom_limits: HashMap<String, T>,
}

/// Timeout settings
#[derive(Debug, Clone)]
pub struct TimeoutSettings {
    /// Global pipeline timeout
    pub global_timeout: Option<Duration>,

    /// Stage-specific timeouts
    pub stage_timeouts: HashMap<String, Duration>,

    /// Heartbeat timeout
    pub heartbeat_timeout: Duration,

    /// Response timeout
    pub response_timeout: Duration,
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for ResourceLimits<T> {
    fn default() -> Self {
        Self {
            max_cpu: T::from(1.0).unwrap_or_else(T::one),
            max_memory_mb: 1024,
            max_gpu: T::from(1.0).unwrap_or_else(T::one),
            max_storage_gb: 10,
            max_network_mbps: 100.0,
            custom_limits: HashMap::new(),
        }
    }
}

impl Default for TimeoutSettings {
    fn default() -> Self {
        use std::time::Duration;
        Self {
            global_timeout: Some(Duration::from_secs(3600)),
            stage_timeouts: HashMap::new(),
            heartbeat_timeout: Duration::from_secs(30),
            response_timeout: Duration::from_secs(60),
        }
    }
}

/// Retry policy configuration
#[derive(Debug, Clone)]
pub struct RetryPolicy {
    /// Maximum retry attempts
    pub max_attempts: usize,

    /// Retry strategy
    pub strategy: RetryStrategy,

    /// Backoff configuration
    pub backoff: BackoffConfiguration,

    /// Retryable errors
    pub retryable_errors: Vec<String>,
}

/// Retry strategies
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RetryStrategy {
    /// Fixed interval retry
    FixedInterval,

    /// Exponential backoff
    ExponentialBackoff,

    /// Linear backoff
    LinearBackoff,

    /// Custom strategy
    Custom,
}

/// Backoff configuration
#[derive(Debug, Clone)]
pub struct BackoffConfiguration {
    /// Initial delay
    pub initial_delay: Duration,

    /// Maximum delay
    pub max_delay: Duration,

    /// Backoff multiplier
    pub multiplier: f64,

    /// Jitter configuration
    pub jitter: JitterConfiguration,
}

/// Jitter configuration
#[derive(Debug, Clone)]
pub struct JitterConfiguration {
    /// Enable jitter
    pub enabled: bool,

    /// Jitter type
    pub jitter_type: JitterType,

    /// Jitter range
    pub range: (f64, f64),
}

/// Jitter types
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum JitterType {
    /// Uniform jitter
    Uniform,

    /// Gaussian jitter
    Gaussian,

    /// Exponential jitter
    Exponential,
}

/// Checkpoint settings
#[derive(Debug, Clone)]
pub struct CheckpointSettings<T: Float + Debug + Send + Sync + 'static> {
    /// Enable checkpointing
    pub enabled: bool,

    /// Checkpoint frequency
    pub frequency: CheckpointFrequency,

    /// Checkpoint storage
    pub storage: CheckpointStorage,

    /// Compression settings
    pub compression: CompressionSettings,

    /// Retention policy
    pub retention: CheckpointRetentionPolicy<T>,
}

/// Checkpoint frequency
#[derive(Debug, Clone)]
pub enum CheckpointFrequency {
    /// Time-based checkpointing
    TimeBased(Duration),

    /// Stage-based checkpointing
    StageBased,

    /// Progress-based checkpointing
    ProgressBased(f64),

    /// Event-based checkpointing
    EventBased(Vec<String>),

    /// Manual checkpointing
    Manual,
}

/// Checkpoint storage configuration
#[derive(Debug, Clone)]
pub struct CheckpointStorage {
    /// Storage type
    pub storage_type: StorageType,

    /// Storage location
    pub location: String,

    /// Storage credentials
    pub credentials: Option<String>,

    /// Storage options
    pub options: HashMap<String, String>,
}

/// Storage types
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum StorageType {
    /// Local filesystem
    Local,

    /// Network filesystem
    Network,

    /// Cloud storage
    Cloud,

    /// Database
    Database,

    /// In-memory storage
    Memory,
}

/// Compression settings
#[derive(Debug, Clone)]
pub struct CompressionSettings {
    /// Enable compression
    pub enabled: bool,

    /// Compression algorithm
    pub algorithm: CompressionAlgorithm,

    /// Compression level
    pub level: u8,

    /// Compression options
    pub options: HashMap<String, String>,
}

/// Compression algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CompressionAlgorithm {
    None,
    Gzip,
    Bzip2,
    Lz4,
    Zstd,
    Snappy,
}

/// Checkpoint retention policy
#[derive(Debug, Clone)]
pub struct CheckpointRetentionPolicy<T: Float + Debug + Send + Sync + 'static> {
    /// Maximum number of checkpoints
    pub max_checkpoints: usize,

    /// Retention duration
    pub retention_duration: Option<Duration>,

    /// Cleanup strategy
    pub cleanup_strategy: CleanupStrategy,

    /// Retention rules
    pub retention_rules: Vec<RetentionRule<T>>,
}

/// Cleanup strategies
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CleanupStrategy {
    /// FIFO cleanup
    FIFO,

    /// LRU cleanup
    LRU,

    /// Size-based cleanup
    SizeBased,

    /// Custom cleanup
    Custom,
}

/// Retention rule
#[derive(Debug, Clone)]
pub struct RetentionRule<T: Float + Debug + Send + Sync + 'static> {
    /// Rule condition
    pub condition: RetentionCondition<T>,

    /// Rule action
    pub action: RetentionAction,

    /// Rule priority
    pub priority: u8,
}

/// Retention conditions
#[derive(Debug, Clone)]
pub enum RetentionCondition<T: Float + Debug + Send + Sync + 'static> {
    /// Age-based condition
    Age(Duration),

    /// Size-based condition
    Size(usize),

    /// Performance-based condition
    Performance(T),

    /// Custom condition
    Custom(String),
}

/// Retention actions
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RetentionAction {
    /// Keep checkpoint
    Keep,

    /// Delete checkpoint
    Delete,

    /// Archive checkpoint
    Archive,

    /// Compress checkpoint
    Compress,
}

/// Monitoring configuration
#[derive(Debug, Clone)]
pub struct MonitoringConfiguration<T: Float + Debug + Send + Sync + 'static> {
    /// Enable monitoring
    pub enabled: bool,

    /// Monitoring frequency
    pub frequency: Duration,

    /// Metrics collection
    pub metrics: MetricsConfiguration<T>,

    /// Alerting configuration
    pub alerting: AlertingConfiguration<T>,

    /// Logging configuration
    pub logging: LoggingConfiguration,
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for MonitoringConfiguration<T> {
    fn default() -> Self {
        Self {
            enabled: true,
            frequency: Duration::from_secs(10),
            metrics: MetricsConfiguration::default(),
            alerting: AlertingConfiguration::default(),
            logging: LoggingConfiguration::default(),
        }
    }
}

/// Metrics configuration
#[derive(Debug, Clone)]
pub struct MetricsConfiguration<T: Float + Debug + Send + Sync + 'static> {
    /// Metrics to collect
    pub metrics: Vec<MetricType>,

    /// Collection frequency
    pub collection_frequency: Duration,

    /// Aggregation settings
    pub aggregation: AggregationSettings<T>,

    /// Export settings
    pub export: ExportSettings,
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for MetricsConfiguration<T> {
    fn default() -> Self {
        Self {
            metrics: vec![MetricType::ResourceUtilization, MetricType::Performance],
            collection_frequency: Duration::from_secs(5),
            aggregation: AggregationSettings::default(),
            export: ExportSettings::default(),
        }
    }
}

/// Metric types
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum MetricType {
    /// Resource utilization
    ResourceUtilization,

    /// Performance metrics
    Performance,

    /// Quality metrics
    Quality,

    /// Error metrics
    Errors,

    /// Throughput metrics
    Throughput,

    /// Latency metrics
    Latency,

    /// Custom metrics
    Custom,
}

/// Aggregation settings
#[derive(Debug, Clone)]
pub struct AggregationSettings<T: Float + Debug + Send + Sync + 'static> {
    /// Aggregation functions
    pub functions: Vec<AggregationFunction>,

    /// Aggregation window
    pub window: Duration,

    /// Aggregation interval
    pub interval: Duration,

    /// Retention period
    pub retention: Duration,

    /// Custom aggregations
    pub custom: HashMap<String, T>,
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for AggregationSettings<T> {
    fn default() -> Self {
        Self {
            functions: vec![
                AggregationFunction::Mean,
                AggregationFunction::Max,
                AggregationFunction::Min,
            ],
            window: Duration::from_secs(60),
            interval: Duration::from_secs(10),
            retention: Duration::from_secs(86400),
            custom: HashMap::new(),
        }
    }
}

/// Aggregation functions
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AggregationFunction {
    Mean,
    Median,
    Min,
    Max,
    Sum,
    Count,
    Percentile(u8),
    StandardDeviation,
}

/// Export settings
#[derive(Debug, Clone)]
pub struct ExportSettings {
    /// Export destinations
    pub destinations: Vec<ExportDestination>,

    /// Export format
    pub format: ExportFormat,

    /// Export frequency
    pub frequency: Duration,

    /// Export filters
    pub filters: Vec<ExportFilter>,
}

impl Default for ExportSettings {
    fn default() -> Self {
        Self {
            destinations: vec![ExportDestination::InMemory],
            format: ExportFormat::JSON,
            frequency: Duration::from_secs(60),
            filters: Vec::new(),
        }
    }
}

/// Export destinations
#[derive(Debug, Clone)]
pub enum ExportDestination {
    /// In-memory storage
    InMemory,

    /// File export
    File(String),

    /// Database export
    Database(String),

    /// HTTP endpoint
    HTTP(String),

    /// Message queue
    MessageQueue(String),

    /// Custom destination
    Custom(String),
}

/// Export formats
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ExportFormat {
    JSON,
    CSV,
    Protobuf,
    Avro,
    Custom,
}

/// Export filter
#[derive(Debug, Clone)]
pub struct ExportFilter {
    /// Filter name
    pub name: String,

    /// Filter expression
    pub expression: String,

    /// Filter type
    pub filter_type: FilterType,
}

/// Filter types
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum FilterType {
    Include,
    Exclude,
    Transform,
}

/// Alerting configuration
#[derive(Debug, Clone)]
pub struct AlertingConfiguration<T: Float + Debug + Send + Sync + 'static> {
    /// Enable alerting
    pub enabled: bool,

    /// Alert rules
    pub rules: Vec<AlertRule<T>>,

    /// Notification channels
    pub channels: Vec<NotificationChannel>,

    /// Alert aggregation
    pub aggregation: AlertAggregation,
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for AlertingConfiguration<T> {
    fn default() -> Self {
        Self {
            enabled: false,
            rules: Vec::new(),
            channels: Vec::new(),
            aggregation: AlertAggregation::default(),
        }
    }
}

/// Alert rule
#[derive(Debug, Clone)]
pub struct AlertRule<T: Float + Debug + Send + Sync + 'static> {
    /// Rule identifier
    pub rule_id: String,

    /// Rule condition
    pub condition: AlertCondition<T>,

    /// Alert severity
    pub severity: AlertSeverity,

    /// Alert message template
    pub message_template: String,

    /// Alert actions
    pub actions: Vec<AlertAction>,
}

/// Alert condition
#[derive(Debug, Clone)]
pub enum AlertCondition<T: Float + Debug + Send + Sync + 'static> {
    /// Threshold-based condition
    Threshold {
        metric: String,
        operator: ComparisonOperator,
        value: T,
    },

    /// Trend-based condition
    Trend {
        metric: String,
        direction: TrendDirection,
        duration: Duration,
    },

    /// Anomaly-based condition
    Anomaly { metric: String, sensitivity: T },

    /// Custom condition
    Custom(String),
}

/// Comparison operators
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ComparisonOperator {
    Equal,
    NotEqual,
    GreaterThan,
    GreaterThanOrEqual,
    LessThan,
    LessThanOrEqual,
}

/// Trend directions
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TrendDirection {
    Increasing,
    Decreasing,
    Stable,
}

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

/// Alert actions
#[derive(Debug, Clone)]
pub enum AlertAction {
    /// Send notification
    Notify(String),

    /// Execute script
    ExecuteScript(String),

    /// Call webhook
    Webhook(String),

    /// Pause pipeline
    PausePipeline,

    /// Custom action
    Custom(String),
}

/// Notification channels
#[derive(Debug, Clone)]
pub enum NotificationChannel {
    /// Email notification
    Email {
        recipients: Vec<String>,
        smtp_config: String,
    },

    /// Slack notification
    Slack {
        webhook_url: String,
        channel: String,
    },

    /// SMS notification
    SMS {
        recipients: Vec<String>,
        service_config: String,
    },

    /// Custom notification
    Custom {
        name: String,
        config: HashMap<String, String>,
    },
}

/// Alert aggregation settings
#[derive(Debug, Clone)]
pub struct AlertAggregation {
    /// Aggregation window
    pub window: Duration,

    /// Aggregation strategy
    pub strategy: AggregationStrategy,

    /// Deduplication settings
    pub deduplication: DeduplicationSettings,
}

impl Default for AlertAggregation {
    fn default() -> Self {
        Self {
            window: Duration::from_secs(300),
            strategy: AggregationStrategy::default(),
            deduplication: DeduplicationSettings::default(),
        }
    }
}

/// Aggregation strategies
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum AggregationStrategy {
    /// No aggregation
    None,

    /// Count-based aggregation
    Count,

    /// Time-based aggregation
    #[default]
    TimeBased,

    /// Rule-based aggregation
    RuleBased,
}

/// Deduplication settings
#[derive(Debug, Clone)]
pub struct DeduplicationSettings {
    /// Enable deduplication
    pub enabled: bool,

    /// Deduplication window
    pub window: Duration,

    /// Deduplication key fields
    pub key_fields: Vec<String>,
}

impl Default for DeduplicationSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            window: Duration::from_secs(300),
            key_fields: vec!["id".to_string(), "source".to_string()],
        }
    }
}

/// Logging configuration
#[derive(Debug, Clone)]
pub struct LoggingConfiguration {
    /// Enable logging
    pub enabled: bool,

    /// Log level
    pub level: LogLevel,

    /// Log destinations
    pub destinations: Vec<LogDestination>,

    /// Log format
    pub format: LogFormat,

    /// Log rotation
    pub rotation: LogRotation,
}

impl Default for LoggingConfiguration {
    fn default() -> Self {
        Self {
            enabled: true,
            level: LogLevel::Info,
            destinations: vec![LogDestination::Console],
            format: LogFormat::JSON,
            rotation: LogRotation::default(),
        }
    }
}

/// Log levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum LogLevel {
    Trace,
    Debug,
    Info,
    Warning,
    Error,
    Critical,
}

/// Log destinations
#[derive(Debug, Clone)]
pub enum LogDestination {
    /// File logging
    File(String),

    /// Console logging
    Console,

    /// Syslog
    Syslog,

    /// Remote logging
    Remote(String),

    /// Custom destination
    Custom(String),
}

/// Log formats
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum LogFormat {
    Plain,
    JSON,
    Structured,
    Custom,
}

/// Log rotation settings
#[derive(Debug, Clone)]
pub struct LogRotation {
    /// Enable rotation
    pub enabled: bool,

    /// Rotation strategy
    pub strategy: RotationStrategy,

    /// Maximum file size
    pub max_size: usize,

    /// Maximum file age
    pub max_age: Duration,

    /// Maximum number of files
    pub max_files: usize,
}

impl Default for LogRotation {
    fn default() -> Self {
        Self {
            enabled: true,
            strategy: RotationStrategy::SizeBased,
            max_size: 100 * 1024 * 1024,             // 100 MB
            max_age: Duration::from_secs(86400 * 7), // 7 days
            max_files: 10,
        }
    }
}

/// Rotation strategies
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RotationStrategy {
    SizeBased,
    TimeBased,
    CountBased,
    Custom,
}

/// Security settings
#[derive(Debug, Clone, Default)]
pub struct SecuritySettings {
    /// Authentication settings
    pub authentication: AuthenticationSettings,

    /// Authorization settings
    pub authorization: AuthorizationSettings,

    /// Encryption settings
    pub encryption: EncryptionSettings,

    /// Audit settings
    pub audit: AuditSettings,
}

/// Authentication settings
#[derive(Debug, Clone)]
pub struct AuthenticationSettings {
    /// Authentication type
    pub auth_type: AuthenticationType,

    /// Authentication provider
    pub provider: String,

    /// Authentication configuration
    pub config: HashMap<String, String>,
}

/// Authentication types
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AuthenticationType {
    None,
    Basic,
    OAuth2,
    JWT,
    Certificate,
    Custom,
}

/// Authorization settings
#[derive(Debug, Clone)]
pub struct AuthorizationSettings {
    /// Authorization model
    pub model: AuthorizationModel,

    /// Permission rules
    pub rules: Vec<PermissionRule>,

    /// Role definitions
    pub roles: HashMap<String, Role>,
}

/// Authorization models
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AuthorizationModel {
    None,
    RBAC,
    ABAC,
    Custom,
}

/// Permission rule
#[derive(Debug, Clone)]
pub struct PermissionRule {
    /// Rule identifier
    pub rule_id: String,

    /// Resource pattern
    pub resource: String,

    /// Action pattern
    pub action: String,

    /// Principal pattern
    pub principal: String,

    /// Effect
    pub effect: PermissionEffect,

    /// Conditions
    pub conditions: Vec<String>,
}

/// Permission effects
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum PermissionEffect {
    Allow,
    Deny,
}

/// Role definition
#[derive(Debug, Clone)]
pub struct Role {
    /// Role identifier
    pub role_id: String,

    /// Role name
    pub name: String,

    /// Role permissions
    pub permissions: Vec<String>,

    /// Parent roles
    pub parent_roles: Vec<String>,
}

/// Encryption settings
#[derive(Debug, Clone)]
pub struct EncryptionSettings {
    /// Enable encryption
    pub enabled: bool,

    /// Encryption algorithm
    pub algorithm: EncryptionAlgorithm,

    /// Key management
    pub key_management: KeyManagement,

    /// Encryption scope
    pub scope: EncryptionScope,
}

/// Encryption algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum EncryptionAlgorithm {
    AES256,
    ChaCha20,
    Custom,
}

/// Key management settings
#[derive(Debug, Clone)]
pub struct KeyManagement {
    /// Key provider
    pub provider: String,

    /// Key configuration
    pub config: HashMap<String, String>,

    /// Key rotation settings
    pub rotation: KeyRotation,
}

/// Key rotation settings
#[derive(Debug, Clone)]
pub struct KeyRotation {
    /// Enable rotation
    pub enabled: bool,

    /// Rotation interval
    pub interval: Duration,

    /// Rotation strategy
    pub strategy: RotationStrategy,
}

/// Encryption scope
#[derive(Debug, Clone)]
pub enum EncryptionScope {
    /// Encrypt all data
    All,

    /// Encrypt sensitive data only
    SensitiveOnly,

    /// Custom encryption scope
    Custom(Vec<String>),
}

/// Audit settings
#[derive(Debug, Clone)]
pub struct AuditSettings {
    /// Enable auditing
    pub enabled: bool,

    /// Audit events
    pub events: Vec<AuditEvent>,

    /// Audit destination
    pub destination: AuditDestination,

    /// Audit retention
    pub retention: Duration,
}

/// Audit events
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AuditEvent {
    PipelineStart,
    PipelineEnd,
    StageStart,
    StageEnd,
    ErrorOccurred,
    SecurityEvent,
    ConfigurationChange,
    Custom,
}

/// Audit destinations
#[derive(Debug, Clone)]
pub enum AuditDestination {
    /// File audit log
    File(String),

    /// Database audit log
    Database(String),

    /// Remote audit service
    Remote(String),

    /// Custom audit destination
    Custom(String),
}

// Default implementations for various configuration structures

impl Default for ParallelismSettings {
    fn default() -> Self {
        Self {
            max_parallel_stages: 4,
            stage_parallelism: HashMap::new(),
            thread_pool_config: ThreadPoolConfig::default(),
            load_balancing: LoadBalancingStrategy::RoundRobin,
        }
    }
}

impl Default for ThreadPoolConfig {
    fn default() -> Self {
        Self {
            core_pool_size: 4,
            max_pool_size: 8,
            keep_alive_time: Duration::from_secs(60),
            queue_capacity: 1000,
        }
    }
}

impl<T: Float + Debug + Send + Sync + 'static + Default> Default for CheckpointSettings<T> {
    fn default() -> Self {
        Self {
            enabled: false,
            frequency: CheckpointFrequency::TimeBased(Duration::from_secs(300)),
            storage: CheckpointStorage::default(),
            compression: CompressionSettings::default(),
            retention: CheckpointRetentionPolicy::default(),
        }
    }
}

impl<T: Float + Debug + Send + Sync + 'static> Default for CheckpointRetentionPolicy<T> {
    fn default() -> Self {
        Self {
            max_checkpoints: 10,
            retention_duration: Some(Duration::from_secs(86400 * 7)), // 7 days
            cleanup_strategy: CleanupStrategy::FIFO,
            retention_rules: Vec::new(),
        }
    }
}

impl Default for CheckpointStorage {
    fn default() -> Self {
        Self {
            storage_type: StorageType::Local,
            location: String::from("/tmp/checkpoints"),
            credentials: None,
            options: HashMap::new(),
        }
    }
}

impl Default for CompressionSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            algorithm: CompressionAlgorithm::None,
            level: 6, // Default compression level
            options: HashMap::new(),
        }
    }
}

impl Default for AuthenticationSettings {
    fn default() -> Self {
        Self {
            auth_type: AuthenticationType::None,
            provider: String::from("none"),
            config: HashMap::new(),
        }
    }
}

impl Default for AuthorizationSettings {
    fn default() -> Self {
        Self {
            model: AuthorizationModel::None,
            rules: Vec::new(),
            roles: HashMap::new(),
        }
    }
}

impl Default for EncryptionSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            algorithm: EncryptionAlgorithm::AES256,
            key_management: KeyManagement::default(),
            scope: EncryptionScope::SensitiveOnly,
        }
    }
}

impl Default for KeyManagement {
    fn default() -> Self {
        Self {
            provider: String::from("local"),
            config: HashMap::new(),
            rotation: KeyRotation::default(),
        }
    }
}

impl Default for KeyRotation {
    fn default() -> Self {
        Self {
            enabled: false,
            interval: Duration::from_secs(86400 * 30), // 30 days
            strategy: RotationStrategy::TimeBased,
        }
    }
}

impl Default for AuditSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            events: Vec::new(),
            destination: AuditDestination::File(String::from("/tmp/audit.log")),
            retention: Duration::from_secs(86400 * 30), // 30 days
        }
    }
}

// Additional supporting types and implementations would continue here...
// Due to length constraints, showing the key structure and interfaces

impl<T: Float + Debug + Default + Clone + Send + Sync + 'static> PipelineOrchestrator<T> {
    /// Create new pipeline orchestrator
    pub fn new(config: OrchestratorConfiguration<T>) -> Result<Self> {
        Ok(Self {
            active_pipelines: HashMap::new(),
            pipeline_templates: HashMap::new(),
            scheduler: PipelineScheduler::new()?,
            dependency_resolver: DependencyResolver::new()?,
            resource_coordinator: PipelineResourceCoordinator::new()?,
            monitor: PipelineMonitor::new()?,
            error_handler: PipelineErrorHandler::new()?,
            config,
            stats: PipelineStatistics::default(),
        })
    }

    /// Execute a pipeline
    pub fn execute_pipeline(&mut self, pipeline: OptimizationPipeline<T>) -> Result<String> {
        let execution_id = format!(
            "exec_{}",
            std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap_or_default()
                .as_secs()
        );

        let execution = PipelineExecution {
            execution_id: execution_id.clone(),
            pipeline,
            state: ExecutionState::Pending,
            stage_executions: HashMap::new(),
            timeline: ExecutionTimeline::new(),
            resource_allocations: HashMap::new(),
            context: ExecutionContext::new(),
            results: ExecutionResults::new(),
            errors: ErrorTracker::new(),
        };

        self.active_pipelines
            .insert(execution_id.clone(), execution);
        Ok(execution_id)
    }

    /// Get pipeline execution status
    pub fn get_execution_status(&self, execution_id: &str) -> Option<ExecutionState> {
        self.active_pipelines
            .get(execution_id)
            .map(|exec| exec.state)
    }

    /// Get pipeline statistics
    pub fn get_statistics(&self) -> &PipelineStatistics<T> {
        &self.stats
    }
}

// Simplified implementations for supporting structures
// In a real implementation, these would be fully developed

/// Orchestrator configuration
#[derive(Debug, Clone)]
pub struct OrchestratorConfiguration<T: Float + Debug + Send + Sync + 'static> {
    /// Maximum concurrent pipelines
    pub max_concurrent_pipelines: usize,

    /// Default resource limits
    pub default_resource_limits: ResourceLimits<T>,

    /// Default timeouts
    pub default_timeouts: TimeoutSettings,

    /// Monitoring configuration
    pub monitoring: MonitoringConfiguration<T>,
}

/// Pipeline statistics
#[derive(Debug, Clone)]
pub struct PipelineStatistics<T: Float + Debug + Send + Sync + 'static> {
    /// Total pipelines executed
    pub total_executed: usize,

    /// Total pipelines completed
    pub total_completed: usize,

    /// Total pipelines failed
    pub total_failed: usize,

    /// Average execution time
    pub average_execution_time: Duration,

    /// Success rate
    pub success_rate: T,
}

// Supporting structure placeholders with simplified implementations

#[derive(Debug)]
pub struct PipelineScheduler<T: Float + Debug + Send + Sync + 'static> {
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> PipelineScheduler<T> {
    pub fn new() -> Result<Self> {
        Ok(Self {
            _phantom: std::marker::PhantomData,
        })
    }
}

#[derive(Debug)]
pub struct DependencyResolver<T: Float + Debug + Send + Sync + 'static> {
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> DependencyResolver<T> {
    pub fn new() -> Result<Self> {
        Ok(Self {
            _phantom: std::marker::PhantomData,
        })
    }
}

#[derive(Debug)]
pub struct PipelineResourceCoordinator<T: Float + Debug + Send + Sync + 'static> {
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> PipelineResourceCoordinator<T> {
    pub fn new() -> Result<Self> {
        Ok(Self {
            _phantom: std::marker::PhantomData,
        })
    }
}

#[derive(Debug)]
pub struct PipelineMonitor<T: Float + Debug + Send + Sync + 'static> {
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> PipelineMonitor<T> {
    pub fn new() -> Result<Self> {
        Ok(Self {
            _phantom: std::marker::PhantomData,
        })
    }
}

#[derive(Debug)]
pub struct PipelineErrorHandler<T: Float + Debug + Send + Sync + 'static> {
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> PipelineErrorHandler<T> {
    pub fn new() -> Result<Self> {
        Ok(Self {
            _phantom: std::marker::PhantomData,
        })
    }
}

// Additional supporting types...

#[derive(Debug)]
pub struct ExecutionTimeline {
    start_time: Option<SystemTime>,
    end_time: Option<SystemTime>,
    milestones: Vec<(String, SystemTime)>,
}

impl ExecutionTimeline {
    pub fn new() -> Self {
        Self {
            start_time: None,
            end_time: None,
            milestones: Vec::new(),
        }
    }
}

impl Default for ExecutionTimeline {
    fn default() -> Self {
        Self::new()
    }
}

#[derive(Debug)]
pub struct ExecutionContext<T: Float + Debug + Send + Sync + 'static> {
    variables: HashMap<String, T>,
    metadata: HashMap<String, String>,
}

impl<T: Float + Debug + Send + Sync + 'static> ExecutionContext<T> {
    pub fn new() -> Self {
        Self {
            variables: HashMap::new(),
            metadata: HashMap::new(),
        }
    }
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ExecutionContext<T> {
    fn default() -> Self {
        Self::new()
    }
}

#[derive(Debug)]
pub struct ExecutionResults<T: Float + Debug + Send + Sync + 'static> {
    stage_results: HashMap<String, StageResult<T>>,
    final_result: Option<PipelineResult<T>>,
}

impl<T: Float + Debug + Send + Sync + 'static> ExecutionResults<T> {
    pub fn new() -> Self {
        Self {
            stage_results: HashMap::new(),
            final_result: None,
        }
    }
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ExecutionResults<T> {
    fn default() -> Self {
        Self::new()
    }
}

#[derive(Debug, Clone)]
pub struct PipelineResult<T: Float + Debug + Send + Sync + 'static> {
    pub success: bool,
    pub outputs: HashMap<String, StageOutput<T>>,
    pub metrics: HashMap<String, T>,
    pub artifacts: Vec<Artifact>,
    pub summary: String,
}

#[derive(Debug)]
pub struct ErrorTracker<T: Float + Debug + Send + Sync + 'static> {
    errors: Vec<PipelineError>,
    warnings: Vec<String>,
    _phantom: std::marker::PhantomData<T>,
}

impl<T: Float + Debug + Send + Sync + 'static> ErrorTracker<T> {
    pub fn new() -> Self {
        Self {
            errors: Vec::new(),
            warnings: Vec::new(),
            _phantom: std::marker::PhantomData,
        }
    }
}

impl<T: Float + Debug + Send + Sync + 'static> Default for ErrorTracker<T> {
    fn default() -> Self {
        Self::new()
    }
}

#[derive(Debug, Clone)]
pub struct PipelineError {
    pub error_id: String,
    pub error_type: String,
    pub message: String,
    pub stage_id: Option<String>,
    pub timestamp: SystemTime,
    pub stack_trace: Option<String>,
}

// Additional placeholder structures...

#[derive(Debug, Clone)]
pub struct PipelineMetadata {
    pub created_by: String,
    pub created_at: SystemTime,
    pub updated_at: SystemTime,
    pub tags: Vec<String>,
    pub description: String,
}

#[derive(Debug, Clone)]
pub struct StageConfiguration<T: Float + Debug + Send + Sync + 'static> {
    pub parameters: HashMap<String, T>,
    pub options: HashMap<String, String>,
    pub resources: HashMap<String, T>,
}

#[derive(Debug, Clone)]
pub struct DataSpecification {
    pub name: String,
    pub data_type: String,
    pub format: DataFormat,
    pub schema: Option<DataSchema>,
    pub constraints: Vec<String>,
}

#[derive(Debug, Clone)]
pub struct StageResourceRequirements {
    pub cpu_cores: usize,
    pub memory_mb: usize,
    pub gpu_devices: usize,
    pub storage_gb: usize,
    pub network_mbps: f64,
    pub custom_resources: HashMap<String, f64>,
}

#[derive(Debug, Clone)]
pub struct StageConstraints<T: Float + Debug + Send + Sync + 'static> {
    pub timeout: Option<Duration>,
    pub max_retries: usize,
    pub dependencies: Vec<String>,
    pub conditions: Vec<String>,
    pub thresholds: HashMap<String, T>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ErrorHandlingPolicy {
    FailFast,
    Continue,
    Retry,
    Skip,
    Custom,
}

#[derive(Debug, Clone)]
pub struct StageResourceUsage<T: Float + Debug + Send + Sync + 'static> {
    pub cpu_utilization: T,
    pub memory_utilization: T,
    pub gpu_utilization: T,
    pub storage_utilization: T,
    pub network_utilization: T,
}

#[derive(Debug, Clone)]
pub struct StageMetrics<T: Float + Debug + Send + Sync + 'static> {
    pub throughput: T,
    pub latency: T,
    pub accuracy: T,
    pub quality: T,
    pub efficiency: T,
    pub custom_metrics: HashMap<String, T>,
}

#[derive(Debug, Clone)]
pub struct ResourceAllocation {
    pub cpu_cores: Vec<usize>,
    pub memory_mb: usize,
    pub gpu_devices: Vec<usize>,
    pub storage_gb: usize,
    pub network_mbps: f64,
    pub allocated_at: SystemTime,
}

// Default implementations

impl<T: Float + Debug + Default + Send + Sync> Default for PipelineStatistics<T> {
    fn default() -> Self {
        Self {
            total_executed: 0,
            total_completed: 0,
            total_failed: 0,
            average_execution_time: Duration::from_secs(0),
            success_rate: T::zero(),
        }
    }
}
