scirs2-metrics 0.3.2

//! Advanced distributed optimization with consensus algorithms and fault recovery
//!
//! This module provides comprehensive distributed computing capabilities including:
//! - Consensus algorithms (Raft, PBFT, Proof of Stake)
//! - Advanced data sharding and replication
//! - Automatic fault recovery and healing
//! - Dynamic cluster scaling
//! - Data locality optimization
//! - Advanced partitioning strategies
//! - Performance optimization and monitoring

pub mod consensus;
pub mod fault_recovery;
pub mod monitoring;
pub mod optimization;
pub mod orchestration;
pub mod scaling;
pub mod sharding;

use crate::error::{MetricsError, Result};
use scirs2_core::ndarray::{Array1, Array2};
use scirs2_core::numeric::Float;
use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};
use std::time::{Duration, Instant, SystemTime};

// Re-export main components
pub use consensus::*;
pub use fault_recovery::*;
pub use monitoring::*;
pub use optimization::*;
pub use orchestration::*;
pub use scaling::*;
pub use sharding::*;

/// Comprehensive advanced distributed optimization coordinator
pub struct AdvancedDistributedOptimizer<T: Float> {
    /// Configuration
    config: AdvancedDistributedConfig,

    /// System statistics
    stats: DistributedSystemStats,

    /// Current state (simplified for compilation)
    state: GlobalSystemState<T>,
    // TODO: Add back complex subsystems when their implementations are complete
    // consensus_manager: consensus::ConsensusCoordinator<T>,
    // shard_manager: sharding::DistributedShardManager<T>,
    // recovery_manager: fault_recovery::FaultRecoveryCoordinator<T>,
    // scaling_manager: scaling::AutoScalingCoordinator<T>,
    // performance_optimizer: optimization::DistributedPerformanceOptimizer<T>,
    // orchestrator: orchestration::DistributedOrchestrator<T>,
    // monitoring_system: monitoring::DistributedMonitoringSystem<T>,
}

/// Advanced distributed system configuration
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct AdvancedDistributedConfig {
    /// Basic cluster settings
    pub basic_config: crate::optimization::distributed::DistributedConfig,

    /// Consensus algorithm configuration
    pub consensus_config: consensus::ConsensusConfig,

    /// Data sharding strategy
    pub sharding_config: sharding::ShardingConfig,

    /// Fault tolerance settings
    pub fault_tolerance_config: FaultToleranceConfig,

    /// Auto-scaling configuration
    pub auto_scaling_config: AutoScalingConfig,

    /// Performance optimization settings
    pub optimization_config: OptimizationConfig,

    /// Orchestration configuration
    pub orchestration_config: OrchestrationConfig,

    /// Monitoring configuration
    pub monitoring_config: MonitoringConfig,
}

/// Distributed system statistics
#[derive(Debug, Default, Clone, Serialize, Deserialize)]
pub struct DistributedSystemStats {
    /// Total operations processed
    pub total_operations: u64,

    /// Average operation latency (milliseconds)
    pub avg_latency_ms: f64,

    /// System uptime (seconds)
    pub uptime_seconds: u64,

    /// Current cluster size
    pub cluster_size: usize,

    /// Total consensus decisions
    pub consensus_decisions: u64,

    /// Data shards managed
    pub active_shards: usize,

    /// Fault recovery events
    pub recovery_events: u64,

    /// Scaling operations performed
    pub scaling_operations: u64,

    /// System health score (0.0-1.0)
    pub health_score: f64,
}

/// Global system state
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GlobalSystemState<T: Float> {
    /// Current system timestamp
    pub timestamp: SystemTime,

    /// Active nodes in cluster
    pub active_nodes: HashMap<String, NodeInfo>,

    /// Marker for type parameter
    _phantom: std::marker::PhantomData<T>,
    // TODO: Add back complex subsystem states when implementations are complete
    // pub consensus_state: consensus::ConsensusSystemState,
    // pub sharding_state: sharding::ShardingSystemState,
    // pub recovery_state: fault_recovery::RecoverySystemState,
    // pub scaling_state: scaling::ScalingSystemState,
    // pub performance_state: optimization::PerformanceSystemState,
    // pub orchestration_state: orchestration::OrchestrationSystemState,
}

impl<T: Float> GlobalSystemState<T> {
    pub fn new() -> Self {
        Self {
            timestamp: SystemTime::now(),
            active_nodes: HashMap::new(),
            _phantom: std::marker::PhantomData,
        }
    }
}

/// Node information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeInfo {
    /// Node identifier
    pub node_id: String,

    /// Node address
    pub address: String,

    /// Node status
    pub status: NodeStatus,

    /// Node capabilities
    pub capabilities: NodeCapabilities,

    /// Performance metrics
    pub metrics: NodeMetrics,

    /// Last heartbeat
    pub last_heartbeat: SystemTime,
}

/// Node status
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum NodeStatus {
    /// Node is active and healthy
    Active,

    /// Node is degraded but functional
    Degraded,

    /// Node is failed or unreachable
    Failed,

    /// Node is being initialized
    Initializing,

    /// Node is shutting down
    ShuttingDown,

    /// Node status unknown
    Unknown,
}

/// Node capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeCapabilities {
    /// CPU cores available
    pub cpu_cores: usize,

    /// Memory available (MB)
    pub memory_mb: usize,

    /// Storage available (MB)
    pub storage_mb: usize,

    /// Network bandwidth (Mbps)
    pub network_bandwidth: f64,

    /// Supported consensus algorithms
    pub consensus_algorithms: Vec<String>,

    /// Special capabilities
    pub special_capabilities: Vec<String>,
}

/// Node performance metrics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NodeMetrics {
    /// CPU utilization (0.0-1.0)
    pub cpu_usage: f64,

    /// Memory utilization (0.0-1.0)
    pub memory_usage: f64,

    /// Storage utilization (0.0-1.0)
    pub storage_usage: f64,

    /// Network utilization (0.0-1.0)
    pub network_usage: f64,

    /// Average response time (milliseconds)
    pub avg_response_time_ms: f64,

    /// Operations per second
    pub ops_per_second: f64,

    /// Error rate (0.0-1.0)
    pub error_rate: f64,
}

impl<T: Float + Default + std::fmt::Debug + Clone + Send + Sync> AdvancedDistributedOptimizer<T> {
    /// Create new advanced distributed optimizer
    pub fn new(config: AdvancedDistributedConfig) -> Result<Self> {
        // TODO: Implement full distributed system initialization
        // For now, create placeholder components to allow compilation

        Ok(Self {
            config,
            stats: DistributedSystemStats::default(),
            state: GlobalSystemState::new(),
        })
    }

    /// Initialize the distributed system
    pub async fn initialize(&mut self) -> Result<()> {
        // TODO: Initialize all subsystems when implementations are complete
        // self.consensus_manager.initialize().await?;
        // self.shard_manager.initialize().await?;
        // self.recovery_manager.initialize().await?;
        // self.scaling_manager.initialize().await?;
        // self.performance_optimizer.initialize().await?;
        // self.orchestrator.initialize().await?;
        // self.monitoring_system.initialize().await?;

        Ok(())
    }

    /// Process distributed optimization task
    pub async fn optimize_distributed(&mut self, data: &Array2<T>) -> Result<Array2<T>> {
        let start_time = Instant::now();

        // Monitor system state
        let system_state = self.get_system_state().await?;
        // TODO: Uncomment when monitoring system is implemented
        // self.monitoring_system.record_system_state(&system_state).await?;

        // TODO: Uncomment when scaling manager is implemented
        // Check if scaling is needed
        // if self.scaling_manager.should_scale(&system_state).await? {
        //     self.scaling_manager.execute_scaling(&system_state).await?;
        // }

        // TODO: Uncomment when shard manager is implemented
        // Optimize data distribution
        // let sharding_plan = self.shard_manager.create_optimal_sharding_plan(data).await?;

        // TODO: Uncomment when consensus manager is implemented
        // Distribute data using consensus
        // let consensus_result = self.consensus_manager.reach_consensus_on_plan(&sharding_plan).await?;

        // TODO: Uncomment when orchestrator is implemented
        // Execute distributed computation
        // let computation_result = self.orchestrator.execute_distributed_computation(
        //     data,
        //     &consensus_result.plan
        // ).await?;

        // TODO: Uncomment when performance optimizer is implemented
        // Apply performance optimizations
        // let optimized_result = self.performance_optimizer.optimize_result(&computation_result).await?;

        // Simplified implementation for now
        let optimized_result = data.clone();

        // Update statistics
        let elapsed = start_time.elapsed();
        self.stats.total_operations += 1;
        self.stats.avg_latency_ms = (self.stats.avg_latency_ms
            * (self.stats.total_operations - 1) as f64
            + elapsed.as_millis() as f64)
            / self.stats.total_operations as f64;

        Ok(optimized_result)
    }

    /// Get current system state
    pub async fn get_system_state(&self) -> Result<GlobalSystemState<T>> {
        Ok(GlobalSystemState {
            timestamp: SystemTime::now(),
            active_nodes: HashMap::new(), // TODO: Get from monitoring system
            _phantom: std::marker::PhantomData,
            // TODO: Add back subsystem states when implementations are complete
        })
    }

    /// Handle system failures
    pub async fn handle_failure(&mut self, failure_info: FailureInfo) -> Result<()> {
        // TODO: Implement failure handling when subsystems are complete
        // self.monitoring_system.record_failure(&failure_info).await?;
        // let recovery_plan = self.recovery_manager.create_recovery_plan(&failure_info).await?;
        // self.recovery_manager.execute_recovery_plan(&recovery_plan).await?;
        // self.consensus_manager.handle_node_failure(&failure_info.node_id).await?;
        // self.shard_manager.rebalance_after_failure(&failure_info).await?;

        // Update statistics
        self.stats.recovery_events += 1;
        self.stats.health_score = self.calculate_health_score().await?;

        Ok(())
    }

    /// Calculate system health score
    async fn calculate_health_score(&self) -> Result<f64> {
        // TODO: Uncomment when all subsystems are implemented
        // let consensus_health = self.consensus_manager.get_health_score().await?;
        // let sharding_health = self.shard_manager.get_health_score().await?;
        // let recovery_health = self.recovery_manager.get_health_score().await?;
        // let scaling_health = self.scaling_manager.get_health_score().await?;
        // let performance_health = self.performance_optimizer.get_health_score().await?;
        // let orchestration_health = self.orchestrator.get_health_score().await?;

        // let overall_health = (consensus_health + sharding_health + recovery_health +
        //                      scaling_health + performance_health + orchestration_health) / 6.0;

        // Simplified health score for now
        let overall_health = 0.8; // Default reasonable health score

        Ok(overall_health.min(1.0).max(0.0))
    }

    /// Get system statistics
    pub fn get_statistics(&self) -> &DistributedSystemStats {
        &self.stats
    }

    /// Shutdown the distributed system
    pub async fn shutdown(&mut self) -> Result<()> {
        // TODO: Uncomment when all subsystems are implemented
        // Graceful shutdown of all subsystems
        // self.orchestrator.shutdown().await?;
        // self.performance_optimizer.shutdown().await?;
        // self.scaling_manager.shutdown().await?;
        // self.recovery_manager.shutdown().await?;
        // self.shard_manager.shutdown().await?;
        // self.consensus_manager.shutdown().await?;
        // self.monitoring_system.shutdown().await?;

        Ok(())
    }
}

impl Default for NodeMetrics {
    fn default() -> Self {
        Self {
            cpu_usage: 0.0,
            memory_usage: 0.0,
            storage_usage: 0.0,
            network_usage: 0.0,
            avg_response_time_ms: 0.0,
            ops_per_second: 0.0,
            error_rate: 0.0,
        }
    }
}

// Missing types referenced in mod.rs imports
/// Advanced cluster configuration (alias for AdvancedDistributedConfig)
pub type AdvancedClusterConfig = AdvancedDistributedConfig;

/// Advanced distributed coordinator (alias for AdvancedDistributedOptimizer)
pub type AdvancedDistributedCoordinator = AdvancedDistributedOptimizer<f64>;

/// Auto-scaling configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AutoScalingConfig {
    pub enabled: bool,
    pub min_nodes: usize,
    pub max_nodes: usize,
    pub scale_up_threshold: f64,
    pub scale_down_threshold: f64,
}

impl Default for AutoScalingConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            min_nodes: 1,
            max_nodes: 10,
            scale_up_threshold: 0.8,
            scale_down_threshold: 0.3,
        }
    }
}

/// Cluster state
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ClusterState {
    pub nodes: HashMap<String, NodeInfo>,
    pub cluster_size: usize,
    pub healthy_nodes: usize,
    pub status: ClusterStatus,
    pub last_updated: SystemTime,
}

/// Cluster status enumeration
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum ClusterStatus {
    Initializing,
    Active,
    Degraded,
    Failed,
}

/// Distributed task
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DistributedTask {
    pub id: String,
    pub task_type: TaskType,
    pub priority: TaskPriority,
    pub payload: Vec<u8>,
    pub created_at: SystemTime,
}

/// Task type enumeration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TaskType {
    Computation,
    DataTransfer,
    Synchronization,
    Maintenance,
}

/// Task priority levels
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub enum TaskPriority {
    Low,
    Normal,
    High,
    Critical,
}

/// Fault tolerance configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FaultToleranceConfig {
    pub enabled: bool,
    pub max_retries: usize,
    pub retry_delay_ms: u64,
    pub health_check_interval_ms: u64,
    pub failure_threshold: f64,
}

impl Default for FaultToleranceConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            max_retries: 3,
            retry_delay_ms: 1000,
            health_check_interval_ms: 5000,
            failure_threshold: 0.1,
        }
    }
}

/// Locality configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LocalityConfig {
    pub prefer_local_processing: bool,
    pub max_distance_ms: u64,
    pub data_affinity_enabled: bool,
}

impl Default for LocalityConfig {
    fn default() -> Self {
        Self {
            prefer_local_processing: true,
            max_distance_ms: 100,
            data_affinity_enabled: true,
        }
    }
}

/// Node role enumeration
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum NodeRole {
    Master,
    Worker,
    Storage,
    Coordinator,
}

/// Optimization configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizationConfig {
    pub enabled: bool,
    pub optimization_interval_ms: u64,
    pub performance_threshold: f64,
    pub auto_tune_parameters: bool,
}

impl Default for OptimizationConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            optimization_interval_ms: 30000,
            performance_threshold: 0.8,
            auto_tune_parameters: true,
        }
    }
}

/// Orchestration configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OrchestrationConfig {
    pub enabled: bool,
    pub coordination_interval_ms: u64,
    pub service_discovery_enabled: bool,
    pub load_balancing_enabled: bool,
}

impl Default for OrchestrationConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            coordination_interval_ms: 10000,
            service_discovery_enabled: true,
            load_balancing_enabled: true,
        }
    }
}

/// Monitoring configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MonitoringConfig {
    pub enabled: bool,
    pub metrics_collection_interval_ms: u64,
    pub alert_threshold: f64,
    pub log_level: String,
}

impl Default for MonitoringConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            metrics_collection_interval_ms: 5000,
            alert_threshold: 0.9,
            log_level: "INFO".to_string(),
        }
    }
}

/// Failure information for fault recovery
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FailureInfo {
    pub failed_node_id: String,
    pub failure_type: FailureType,
    pub timestamp: SystemTime,
    pub affected_services: Vec<String>,
}

/// Types of failures that can occur
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum FailureType {
    NodeFailure,
    NetworkPartition,
    ServiceFailure,
    ResourceExhaustion,
}

/// Resource requirements
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResourceRequirements {
    pub cpu_cores: f64,
    pub memory_gb: f64,
    pub storage_gb: f64,
    pub network_mbps: f64,
    pub gpu_required: bool,
}

impl Default for ResourceRequirements {
    fn default() -> Self {
        Self {
            cpu_cores: 1.0,
            memory_gb: 2.0,
            storage_gb: 10.0,
            network_mbps: 100.0,
            gpu_required: false,
        }
    }
}

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

    #[test]
    fn test_advanced_distributed_config() {
        let config = AdvancedDistributedConfig::default();
        assert!(config.consensus_config.quorum_size > 0);
        assert!(config.sharding_config.shard_count > 0);
    }

    #[test]
    fn test_node_metrics() {
        let metrics = NodeMetrics::default();
        assert_eq!(metrics.cpu_usage, 0.0);
        assert_eq!(metrics.ops_per_second, 0.0);
    }

    #[test]
    fn test_distributed_system_stats() {
        let stats = DistributedSystemStats::default();
        assert_eq!(stats.total_operations, 0);
        assert_eq!(stats.health_score, 0.0);
    }
}