dmsc 0.1.9

//! Copyright © 2025-2026 Wenze Wei. All Rights Reserved.
//!
//! This file is part of Ri.
//! The Ri project belongs to the Dunimd Team.
//!
//! Licensed under the Apache License, Version 2.0 (the "License");
//! You may not use this file except in compliance with the License.
//! You may obtain a copy of the License at
//!
//!     http://www.apache.org/licenses/LICENSE-2.0
//!
//! Unless required by applicable law or agreed to in writing, software
//! distributed under the License is distributed on an "AS IS" BASIS,
//! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//! See the License for the specific language governing permissions and
//! limitations under the License.

#![allow(non_snake_case)]

//! # Global State Manager Module
//! 
//! This module provides centralized state management for the Ri system,
//! enabling coordination between global systems and private communication
//! protocols. It acts as the central nervous system that maintains consistency
//! across all protocol implementations and system components.
//! 
//! ## Architecture Overview
//! 
//! The global state manager implements a hierarchical state management system:
//! 
//! - **Global State**: System-wide configuration and status
//! - **Protocol State**: Per-protocol connection and configuration state
//! - **Device State**: Individual device status and capabilities
//! - **Security State**: Security policies and threat intelligence
//! - **Performance State**: System performance metrics and optimization data
//! 
//! ## Key Features
//! 
//! - **Cross-Protocol State Synchronization**: Maintain consistency across protocols
//! - **Distributed State Management**: Support for distributed deployments
//! - **Real-Time State Updates**: Immediate state propagation across components
//! - **State Versioning**: Track state changes and enable rollback
//! - **Conflict Resolution**: Handle concurrent state modifications
//! - **State Persistence**: Durable state storage with recovery mechanisms
//! 
//! ## State Synchronization
//! 
//! The manager implements multiple synchronization strategies:
//! 
//! - **Eventual Consistency**: For non-critical state information
//! - **Strong Consistency**: For security and configuration state
//! - **Causal Consistency**: For operational state and metrics
//! - **Custom Consistency**: Application-specific consistency requirements
//! 
//! ## Usage Examples
//! 
//! ```rust
//! use ri::protocol::global_state::{RiGlobalStateManager, RiStateUpdate, RiStateCategory};
//! 
//! async fn example() -> RiResult<()> {
//!     // Create global state manager
//!     let state_manager = RiGlobalStateManager::new();
//!     
//!     // Initialize state manager
//!     state_manager.initialize().await?;
//!     
//!     // Update protocol state
//!     let update = RiStateUpdate::Protocol {
//!         protocol_type: RiProtocolType::Private,
//!         status: RiProtocolStatus::Active,
//!         config: protocol_config,
//!         connections: active_connections,
//!     };
//!     state_manager.update_state(update).await?;
//!     
//!     // Query device state
//!     let device_state = state_manager.get_device_state("device-123").await?;
//!     
//!     // Subscribe to state changes
//!     let mut state_rx = state_manager.subscribe_state_changes().await;
//!     while let Some(change) = state_rx.recv().await {
//!         println!("State changed: {:?}", change);
//!     }
//!     
//!     Ok(())
//! }
//! ```

use std::collections::HashMap as FxHashMap;
use std::sync::Arc;
use std::time::{Duration, Instant};
use async_trait::async_trait;
use tokio::sync::{RwLock, broadcast, mpsc};
use uuid::Uuid;
use zeroize::{Zeroize, ZeroizeOnDrop};
use secrecy::{ExposeSecret, SecretVec};
use aes_gcm::{Aes256Gcm, Key, Nonce, KeyInit};
use rand::RngCore;

use crate::core::{RiResult, RiError};
use super::{RiProtocolType, RiProtocolConfig, RiProtocolStats, RiConnectionInfo, 
            RiSecurityLevel, RiDeviceAuthStatus};

/// Global state manager for coordinating system-wide state.
pub struct RiGlobalStateManager {
    /// Global system state
    global_state: Arc<RwLock<RiGlobalState>>,
    /// Protocol-specific state
    protocol_states: Arc<RwLock<FxHashMap<RiProtocolType, RiProtocolState>>>,
    /// Device-specific state
    device_states: Arc<RwLock<FxHashMap<String, RiDeviceState>>>,
    /// Security state
    security_state: Arc<RwLock<RiSecurityState>>,
    /// Performance state
    performance_state: Arc<RwLock<RiPerformanceState>>,
    /// State change subscribers
    state_subscribers: Arc<RwLock<Vec<broadcast::Sender<RiStateChange>>>>,
    /// State version manager
    version_manager: Arc<RiStateVersionManager>,
    /// State persistence manager
    persistence_manager: Arc<RiStatePersistenceManager>,
    /// Whether the manager is initialized
    initialized: Arc<RwLock<bool>>,
}

/// Global system state structure.
#[derive(Debug, Clone)]
pub struct RiGlobalState {
    /// System identifier
    pub system_id: String,
    /// System status
    pub system_status: RiSystemStatus,
    /// Global configuration
    pub global_config: RiGlobalConfig,
    /// Active protocols
    pub active_protocols: Vec<RiProtocolType>,
    /// System capabilities
    pub capabilities: Vec<RiCapability>,
    /// Last update timestamp
    pub last_update: Instant,
    /// State version
    pub version: u64,
}

/// Protocol-specific state structure.
#[derive(Debug, Clone)]
pub struct RiProtocolState {
    /// Protocol type
    pub protocol_type: RiProtocolType,
    /// Protocol status
    pub status: RiProtocolStatus,
    /// Protocol configuration
    pub config: RiProtocolConfig,
    /// Active connections
    pub connections: Vec<RiConnectionInfo>,
    /// Protocol statistics
    pub stats: RiProtocolStats,
    /// Last heartbeat
    pub last_heartbeat: Instant,
    /// Protocol version
    pub protocol_version: String,
}

/// Device-specific state structure.
#[derive(Debug, Clone)]
pub struct RiDeviceState {
    /// Device identifier
    pub device_id: String,
    /// Device type
    pub device_type: RiDeviceType,
    /// Device status
    pub status: RiDeviceStatus,
    /// Authentication status
    pub auth_status: RiDeviceAuthStatus,
    /// Device capabilities
    pub capabilities: Vec<RiCapability>,
    /// Supported protocols
    pub supported_protocols: Vec<RiProtocolType>,
    /// Last seen timestamp
    pub last_seen: Instant,
    /// Device metadata
    pub metadata: FxHashMap<String, String>,
}

/// Security state structure.
#[derive(Debug, Clone)]
pub struct RiSecurityState {
    /// Global security level
    pub global_security_level: RiSecurityLevel,
    /// Threat intelligence
    pub threat_intelligence: RiThreatIntelligence,
    /// Active security policies
    pub security_policies: Vec<RiSecurityPolicy>,
    /// Security incidents
    pub security_incidents: Vec<RiSecurityIncident>,
    /// Compliance status
    pub compliance_status: FxHashMap<String, RiComplianceStatus>,
    /// Last security scan
    pub last_security_scan: Instant,
}

/// Performance state structure.
#[derive(Debug, Clone)]
pub struct RiPerformanceState {
    /// System performance metrics
    pub metrics: RiPerformanceMetrics,
    /// Resource utilization
    pub resource_utilization: RiResourceUtilization,
    /// Network performance
    pub network_performance: RiNetworkPerformance,
    /// Performance optimizations
    pub optimizations: Vec<RiPerformanceOptimization>,
    /// Performance alerts
    pub alerts: Vec<RiPerformanceAlert>,
    /// Last performance check
    pub last_performance_check: Instant,
}

/// System status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiSystemStatus {
    /// System is initializing
    Initializing,
    /// System is operational
    Operational,
    /// System is degraded
    Degraded,
    /// System is in maintenance
    Maintenance,
    /// System is offline
    Offline,
}

/// Protocol status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiProtocolStatus {
    /// Protocol is inactive
    Inactive,
    /// Protocol is initializing
    Initializing,
    /// Protocol is active
    Active,
    /// Protocol is degraded
    Degraded,
    /// Protocol is error
    Error,
    /// Protocol is shutting down
    ShuttingDown,
}

/// Device type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiDeviceType {
    /// Server device
    Server,
    /// Client device
    Client,
    /// Gateway device
    Gateway,
    /// IoT device
    IoT,
    /// Mobile device
    Mobile,
    /// Unknown device type
    Unknown,
}

/// Device status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiDeviceStatus {
    /// Device is offline
    Offline,
    /// Device is online
    Online,
    /// Device is busy
    Busy,
    /// Device is in error state
    Error,
    /// Device is suspended
    Suspended,
}

/// System capability structure.
#[derive(Debug, Clone)]
pub struct RiCapability {
    /// Capability name
    pub name: String,
    /// Capability version
    pub version: String,
    /// Capability description
    pub description: String,
    /// Required protocols
    pub required_protocols: Vec<RiProtocolType>,
}

/// Threat intelligence structure.
#[derive(Debug, Clone)]
pub struct RiThreatIntelligence {
    /// Current threat level
    pub threat_level: RiThreatLevel,
    /// Active threats
    pub active_threats: Vec<RiActiveThreat>,
    /// Threat indicators
    pub threat_indicators: Vec<RiThreatIndicator>,
    /// Last threat update
    pub last_update: Instant,
}

/// Threat level enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiThreatLevel {
    /// Normal threat level
    Normal,
    /// Elevated threat level
    Elevated,
    /// High threat level
    High,
    /// Critical threat level
    Critical,
}

/// Active threat structure.
#[derive(Debug, Clone)]
pub struct RiActiveThreat {
    /// Threat identifier
    pub threat_id: String,
    /// Threat type
    pub threat_type: RiThreatType,
    /// Threat severity
    pub severity: RiThreatSeverity,
    /// Affected systems
    pub affected_systems: Vec<String>,
    /// Detection time
    pub detection_time: Instant,
    /// Mitigation status
    pub mitigation_status: RiMitigationStatus,
}

/// Threat type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiThreatType {
    /// Malware threat
    Malware,
    /// Intrusion attempt
    Intrusion,
    /// Data breach
    DataBreach,
    /// Denial of service
    DoS,
    /// Insider threat
    Insider,
    /// Advanced persistent threat
    APT,
}

/// Threat severity enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiThreatSeverity {
    /// Low severity
    Low,
    /// Medium severity
    Medium,
    /// High severity
    High,
    /// Critical severity
    Critical,
}

/// Mitigation status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiMitigationStatus {
    /// Not mitigated
    NotMitigated,
    /// Partially mitigated
    PartiallyMitigated,
    /// Fully mitigated
    FullyMitigated,
    /// Under investigation
    UnderInvestigation,
}

/// Threat indicator structure.
#[derive(Debug, Clone)]
pub struct RiThreatIndicator {
    /// Indicator type
    pub indicator_type: RiThreatIndicatorType,
    /// Indicator value
    pub value: String,
    /// Confidence level
    pub confidence: f32,
    /// Source
    pub source: String,
    /// First seen
    pub first_seen: Instant,
    /// Last seen
    pub last_seen: Instant,
}

/// Threat indicator type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiThreatIndicatorType {
    /// IP address indicator
    IPAddress,
    /// Domain indicator
    Domain,
    /// File hash indicator
    FileHash,
    /// URL indicator
    URL,
    /// Email indicator
    Email,
    /// Process indicator
    Process,
}

/// Security policy structure.
#[derive(Debug, Clone)]
pub struct RiSecurityPolicy {
    /// Policy identifier
    pub policy_id: String,
    /// Policy name
    pub name: String,
    /// Policy description
    pub description: String,
    /// Policy rules
    pub rules: Vec<RiSecurityRule>,
    /// Enforcement level
    pub enforcement_level: RiEnforcementLevel,
    /// Policy status
    pub status: RiSecurityPolicyStatus,
}

/// Security rule structure.
#[derive(Debug, Clone)]
pub struct RiSecurityRule {
    /// Rule name
    pub rule_name: String,
    /// Rule condition
    pub condition: RiSecurityCondition,
    /// Rule action
    pub action: RiSecurityAction,
    /// Rule priority
    pub priority: u32,
}

/// Security condition enumeration.
#[derive(Debug, Clone)]
pub enum RiSecurityCondition {
    /// Threat level condition
    ThreatLevel(RiThreatLevel),
    /// Data classification condition
    DataClassification(RiDataClassification),
    /// Network environment condition
    NetworkEnvironment(RiNetworkEnvironment),
    /// Device type condition
    DeviceType(RiDeviceType),
    /// Custom condition
    Custom(String),
}

/// Security action enumeration.
#[derive(Debug, Clone)]
pub enum RiSecurityAction {
    /// Allow action
    Allow,
    /// Deny action
    Deny,
    /// Log action
    Log,
    /// Alert action
    Alert,
    /// Quarantine action
    Quarantine,
    /// Custom action
    Custom(String),
}

/// Enforcement level enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiEnforcementLevel {
    /// Permissive enforcement
    Permissive,
    /// Standard enforcement
    Standard,
    /// Strict enforcement
    Strict,
    /// Maximum enforcement
    Maximum,
}

/// Security policy status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiSecurityPolicyStatus {
    /// Policy is draft
    Draft,
    /// Policy is active
    Active,
    /// Policy is suspended
    Suspended,
    /// Policy is retired
    Retired,
}

/// Security incident structure.
#[derive(Debug, Clone)]
pub struct RiSecurityIncident {
    /// Incident identifier
    pub incident_id: String,
    /// Incident type
    pub incident_type: RiSecurityIncidentType,
    /// Incident severity
    pub severity: RiSecurityIncidentSeverity,
    /// Affected systems
    pub affected_systems: Vec<String>,
    /// Incident description
    pub description: String,
    /// Detection time
    pub detection_time: Instant,
    /// Resolution status
    pub resolution_status: RiResolutionStatus,
}

/// Security incident type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiSecurityIncidentType {
    /// Unauthorized access
    UnauthorizedAccess,
    /// Data breach
    DataBreach,
    /// Malware infection
    MalwareInfection,
    /// Policy violation
    PolicyViolation,
    /// System compromise
    SystemCompromise,
}

/// Security incident severity enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiSecurityIncidentSeverity {
    /// Low severity
    Low,
    /// Medium severity
    Medium,
    /// High severity
    High,
    /// Critical severity
    Critical,
}

/// Resolution status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiResolutionStatus {
    /// Not resolved
    NotResolved,
    /// Under investigation
    UnderInvestigation,
    /// Partially resolved
    PartiallyResolved,
    /// Fully resolved
    FullyResolved,
}

/// Compliance status structure.
#[derive(Debug, Clone)]
pub struct RiComplianceStatus {
    /// Compliance framework
    pub framework: String,
    /// Compliance level
    pub level: RiComplianceLevel,
    /// Last assessment
    pub last_assessment: Instant,
    /// Next assessment due
    pub next_assessment_due: Instant,
}

/// Compliance level enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiComplianceLevel {
    /// Non-compliant
    NonCompliant,
    /// Partially compliant
    PartiallyCompliant,
    /// Fully compliant
    FullyCompliant,
    /// Exceeds requirements
    ExceedsRequirements,
}

/// Data classification enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiDataClassification {
    /// Public data
    Public,
    /// Internal data
    Internal,
    /// Confidential data
    Confidential,
    /// Secret data
    Secret,
    /// Top secret data
    TopSecret,
}

/// Network environment enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiNetworkEnvironment {
    /// Trusted internal network
    Trusted,
    /// Untrusted external network
    Untrusted,
    /// Hostile network environment
    Hostile,
    /// Unknown network environment
    Unknown,
}

/// Global configuration structure.
#[derive(Debug, Clone)]
pub struct RiGlobalConfig {
    /// System name
    pub system_name: String,
    /// System version
    pub system_version: String,
    /// Maximum connections
    pub max_connections: u32,
    /// Connection timeout
    pub connection_timeout: Duration,
    /// Retry policy
    pub retry_policy: RiRetryPolicy,
    /// Logging configuration
    pub logging_config: RiLoggingConfig,
}

/// Retry policy structure.
#[derive(Debug, Clone)]
pub struct RiRetryPolicy {
    /// Maximum retry attempts
    pub max_attempts: u32,
    /// Retry delay
    pub retry_delay: Duration,
    /// Exponential backoff
    pub exponential_backoff: bool,
    /// Maximum retry delay
    pub max_retry_delay: Duration,
}

/// Logging configuration structure.
#[derive(Debug, Clone)]
pub struct RiLoggingConfig {
    /// Log level
    pub log_level: String,
    /// Log destination
    pub log_destination: String,
    /// Log rotation policy
    pub rotation_policy: RiRotationPolicy,
}

/// Rotation policy structure.
#[derive(Debug, Clone)]
pub struct RiRotationPolicy {
    /// Maximum file size
    pub max_file_size: u64,
    /// Maximum file count
    pub max_file_count: u32,
    /// Rotation interval
    pub rotation_interval: Duration,
}

/// Performance metrics structure.
#[derive(Debug, Clone)]
pub struct RiPerformanceMetrics {
    /// CPU utilization
    pub cpu_utilization: f32,
    /// Memory utilization
    pub memory_utilization: f32,
    /// Network throughput
    pub network_throughput: u64,
    /// Response time
    pub response_time: Duration,
    /// Error rate
    pub error_rate: f32,
}

/// Resource utilization structure.
#[derive(Debug, Clone)]
pub struct RiResourceUtilization {
    /// CPU cores
    pub cpu_cores: u32,
    /// Memory total
    pub memory_total: u64,
    /// Memory used
    pub memory_used: u64,
    /// Disk total
    pub disk_total: u64,
    /// Disk used
    pub disk_used: u64,
}

/// Network performance structure.
#[derive(Debug, Clone)]
pub struct RiNetworkPerformance {
    /// Network latency
    pub latency: Duration,
    /// Packet loss
    pub packet_loss: f32,
    /// Bandwidth utilization
    pub bandwidth_utilization: f32,
    /// Network errors
    pub network_errors: u64,
}

/// Performance optimization structure.
#[derive(Debug, Clone)]
pub struct RiPerformanceOptimization {
    /// Optimization type
    pub optimization_type: RiOptimizationType,
    /// Optimization description
    pub description: String,
    /// Performance impact
    pub performance_impact: f32,
    /// Implementation status
    pub implementation_status: RiImplementationStatus,
}

/// Optimization type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiOptimizationType {
    /// Network optimization
    Network,
    /// Memory optimization
    Memory,
    /// CPU optimization
    CPU,
    /// Storage optimization
    Storage,
    /// Algorithm optimization
    Algorithm,
}

/// Implementation status enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiImplementationStatus {
    /// Not implemented
    NotImplemented,
    /// In progress
    InProgress,
    /// Implemented
    Implemented,
    /// Tested
    Tested,
}

/// Performance alert structure.
#[derive(Debug, Clone)]
pub struct RiPerformanceAlert {
    /// Alert type
    pub alert_type: RiPerformanceAlertType,
    /// Alert message
    pub message: String,
    /// Alert severity
    pub severity: RiPerformanceAlertSeverity,
    /// Alert time
    pub alert_time: Instant,
    /// Resolution status
    pub resolution_status: RiResolutionStatus,
}

/// Performance alert type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiPerformanceAlertType {
    /// High CPU usage
    HighCPU,
    /// High memory usage
    HighMemory,
    /// Network bottleneck
    NetworkBottleneck,
    /// Storage bottleneck
    StorageBottleneck,
    /// Response time degradation
    ResponseTimeDegradation,
}

/// Performance alert severity enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiPerformanceAlertSeverity {
    /// Warning severity
    Warning,
    /// Critical severity
    Critical,
    /// Emergency severity
    Emergency,
}

/// State change notification structure.
#[derive(Debug, Clone)]
pub struct RiStateChange {
    /// Change type
    pub change_type: RiStateChangeType,
    /// Change category
    pub category: RiStateCategory,
    /// Change data
    pub data: RiStateChangeData,
    /// Change timestamp
    pub timestamp: Instant,
    /// Change version
    pub version: u64,
}

/// State change type enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiStateChangeType {
    /// State created
    Created,
    /// State updated
    Updated,
    /// State deleted
    Deleted,
    /// State synchronized
    Synchronized,
}

/// State category enumeration.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum RiStateCategory {
    /// Global state
    Global,
    /// Protocol state
    Protocol,
    /// Device state
    Device,
    /// Security state
    Security,
    /// Performance state
    Performance,
}

/// State change data enumeration.
#[derive(Debug, Clone)]
pub enum RiStateChangeData {
    /// Global state data
    Global(RiGlobalState),
    /// Protocol state data
    Protocol(RiProtocolState),
    /// Device state data
    Device(RiDeviceState),
    /// Security state data
    Security(RiSecurityState),
    /// Performance state data
    Performance(RiPerformanceState),
}

/// State update enumeration.
#[derive(Debug, Clone)]
pub enum RiStateUpdate {
    /// Global state update
    Global {
        system_status: RiSystemStatus,
        global_config: RiGlobalConfig,
        active_protocols: Vec<RiProtocolType>,
    },
    /// Protocol state update
    Protocol {
        protocol_type: RiProtocolType,
        status: RiProtocolStatus,
        config: RiProtocolConfig,
        connections: Vec<RiConnectionInfo>,
    },
    /// Device state update
    Device {
        device_id: String,
        device_type: RiDeviceType,
        status: RiDeviceStatus,
        auth_status: RiDeviceAuthStatus,
        capabilities: Vec<RiCapability>,
        supported_protocols: Vec<RiProtocolType>,
    },
    /// Security state update
    Security {
        global_security_level: RiSecurityLevel,
        threat_intelligence: RiThreatIntelligence,
        security_policies: Vec<RiSecurityPolicy>,
    },
    /// Performance state update
    Performance {
        metrics: RiPerformanceMetrics,
        resource_utilization: RiResourceUtilization,
        network_performance: RiNetworkPerformance,
    },
}

/// State version manager for tracking state changes.
struct RiStateVersionManager {
    /// Current version
    current_version: Arc<RwLock<u64>>,
    /// Version history
    version_history: Arc<RwLock<Vec<RiStateVersion>>>,
    /// Maximum history size
    max_history_size: usize,
}

/// State version structure.
#[derive(Debug, Clone)]
struct RiStateVersion {
    /// Version number
    version: u64,
    /// Version timestamp
    timestamp: Instant,
    /// Version hash
    version_hash: String,
    /// State snapshot
    state_snapshot: RiStateSnapshot,
}

/// State snapshot structure.
#[derive(Debug, Clone)]
struct RiStateSnapshot {
    /// Global state snapshot
    global_state: RiGlobalState,
    /// Protocol states snapshot
    protocol_states: FxHashMap<RiProtocolType, RiProtocolState>,
    /// Device states snapshot
    device_states: FxHashMap<String, RiDeviceState>,
    /// Security state snapshot
    security_state: RiSecurityState,
    /// Performance state snapshot
    performance_state: RiPerformanceState,
}

/// State persistence manager for durable state storage.
struct RiStatePersistenceManager {
    /// Persistence configuration
    config: RiPersistenceConfig,
    /// Persistence backend
    backend: Arc<dyn RiStateBackend>,
    /// State encryption key
    encryption_key: Arc<RwLock<Option<SecretVec<u8>>>>,
}

/// State encryption key with secure memory handling.
#[derive(ZeroizeOnDrop)]
struct StateEncryptionKey {
    key: SecretVec<u8>,
    created_at: Instant,
}

impl StateEncryptionKey {
    fn new() -> Self {
        let mut key_data = vec![0u8; 32];
        rand::thread_rng().fill_bytes(&mut key_data);
        Self {
            key: SecretVec::new(key_data),
            created_at: Instant::now(),
        }
    }

    fn is_expired(&self, max_age: Duration) -> bool {
        self.created_at.elapsed() > max_age
    }
}

/// Encrypted state backend for secure persistence.
struct RiEncryptedStateBackend {
    /// Encryption key
    encryption_key: Arc<RwLock<StateEncryptionKey>>,
    /// Underlying memory backend
    memory_backend: Arc<RiMemoryStateBackend>,
    /// Encryption interval
    key_rotation_interval: Duration,
}

impl RiEncryptedStateBackend {
    fn new(encryption_key: Arc<RwLock<StateEncryptionKey>>, memory_backend: Arc<RiMemoryStateBackend>) -> Self {
        Self {
            encryption_key,
            memory_backend,
            key_rotation_interval: Duration::from_secs(86400), // 24 hours
        }
    }

    async fn get_current_key(&self) -> RiResult<&SecretVec<u8>> {
        let key = self.encryption_key.read().await;
        if key.is_expired(self.key_rotation_interval) {
            drop(key);
            let mut new_key = self.encryption_key.write().await;
            *new_key = StateEncryptionKey::new();
            return Ok(&new_key.key);
        }
        Ok(&key.key)
    }

    async fn encrypt_and_save(&self, state: &RiStateSnapshot) -> RiResult<()> {
        let key = self.encryption_key.read().await;
        let serialized = bincode::serialize(state)
            .map_err(|e| RiError::Serialization(e.to_string()))?;

        let key_bytes = key.key.expose_secret();
        let aes_key = Key::<Aes256Gcm>::from_slice(key_bytes);
        let cipher = Aes256Gcm::new(aes_key);

        let mut nonce_bytes = [0u8; 12];
        rand::thread_rng().fill_bytes(&mut nonce_bytes);
        let nonce = Nonce::from_slice(&nonce_bytes);

        let ciphertext = cipher.encrypt(nonce, serialized.as_slice())
            .map_err(|e| RiError::CryptoError(e.to_string()))?;

        let mut encrypted_data = Vec::with_capacity(12 + ciphertext.len());
        encrypted_data.extend_from_slice(&nonce_bytes);
        encrypted_data.extend_from_slice(&ciphertext);

        self.memory_backend.save_encrypted(encrypted_data).await
    }

    async fn decrypt_and_load(&self) -> RiResult<Option<RiStateSnapshot>> {
        let encrypted_data = match self.memory_backend.load_encrypted().await? {
            Some(data) => data,
            None => return Ok(None),
        };

        if encrypted_data.len() < 12 + 16 {
            return Ok(None);
        }

        let key = self.encryption_key.read().await;
        let key_bytes = key.key.expose_secret();

        let nonce = Nonce::from_slice(&encrypted_data[..12]);
        let ciphertext = &encrypted_data[12..];

        let aes_key = Key::<Aes256Gcm>::from_slice(key_bytes);
        let cipher = Aes256Gcm::new(aes_key);

        let decrypted = cipher.decrypt(nonce, ciphertext)
            .map_err(|e| RiError::CryptoError(e.to_string()))?;

        let state = bincode::deserialize(&decrypted)
            .map_err(|e| RiError::Serialization(e.to_string()))?;

        Ok(Some(state))
    }
}

#[async_trait]
impl RiStateBackend for RiEncryptedStateBackend {
    async fn save_state(&self, state: &RiStateSnapshot) -> RiResult<()> {
        self.encrypt_and_save(state).await
    }

    async fn load_state(&self) -> RiResult<Option<RiStateSnapshot>> {
        self.decrypt_and_load().await
    }

    async fn delete_state(&self) -> RiResult<()> {
        self.memory_backend.delete_state().await
    }
}

/// Persistence configuration structure.
#[derive(Debug, Clone)]
pub struct RiPersistenceConfig {
    /// Persistence interval
    pub persistence_interval: Duration,
    /// Maximum state size
    pub max_state_size: u64,
    /// Compression enabled
    pub compression_enabled: bool,
    /// Encryption enabled
    pub encryption_enabled: bool,
}

/// State backend trait for pluggable persistence.
#[async_trait]
pub trait RiStateBackend: Send + Sync {
    /// Save state
    async fn save_state(&self, state: &RiStateSnapshot) -> RiResult<()>;
    /// Load state
    async fn load_state(&self) -> RiResult<Option<RiStateSnapshot>>;
    /// Delete state
    async fn delete_state(&self) -> RiResult<()>;
}

impl RiGlobalStateManager {
    /// Create a new global state manager.
    pub fn new() -> Self {
        let system_id = Uuid::new_v4().to_string();
        let global_state = Arc::new(RwLock::new(RiGlobalState {
            system_id: system_id.clone(),
            system_status: RiSystemStatus::Initializing,
            global_config: RiGlobalConfig {
                system_name: "Ri System".to_string(),
                system_version: "1.0.0".to_string(),
                max_connections: 1000,
                connection_timeout: Duration::from_secs(30),
                retry_policy: RiRetryPolicy {
                    max_attempts: 3,
                    retry_delay: Duration::from_secs(1),
                    exponential_backoff: true,
                    max_retry_delay: Duration::from_secs(60),
                },
                logging_config: RiLoggingConfig {
                    log_level: "INFO".to_string(),
                    log_destination: "file".to_string(),
                    rotation_policy: RiRotationPolicy {
                        max_file_size: 100 * 1024 * 1024, // 100MB
                        max_file_count: 10,
                        rotation_interval: Duration::from_secs(86400), // 24 hours
                    },
                },
            },
            active_protocols: vec![RiProtocolType::Global],
            capabilities: vec![],
            last_update: Instant::now(),
            version: 1,
        }));
        
        let version_manager = Arc::new(RiStateVersionManager {
            current_version: Arc::new(RwLock::new(1)),
            version_history: Arc::new(RwLock::new(Vec::new())),
            max_history_size: 1000,
        });
        
        let persistence_config = RiPersistenceConfig {
            persistence_interval: Duration::from_secs(300),
            max_state_size: 100 * 1024 * 1024,
            compression_enabled: true,
            encryption_enabled: true,
        };

        let encryption_key = Arc::new(RwLock::new(StateEncryptionKey::new()));
        let memory_backend = Arc::new(RiMemoryStateBackend::new());
        let encrypted_backend: Arc<dyn RiStateBackend> = Arc::new(RiEncryptedStateBackend::new(
            Arc::clone(&encryption_key),
            memory_backend,
        ));
        
        let persistence_manager = Arc::new(RiStatePersistenceManager {
            config: persistence_config,
            backend: encrypted_backend,
            encryption_key: Arc::new(RwLock::new(None)),
        });
        
        Self {
            global_state,
            protocol_states: Arc::new(RwLock::new(FxHashMap::default())),
            device_states: Arc::new(RwLock::new(FxHashMap::default())),
            security_state: Arc::new(RwLock::new(RiSecurityState {
                global_security_level: RiSecurityLevel::Standard,
                threat_intelligence: RiThreatIntelligence {
                    threat_level: RiThreatLevel::Normal,
                    active_threats: vec![],
                    threat_indicators: vec![],
                    last_update: Instant::now(),
                },
                security_policies: vec![],
                security_incidents: vec![],
                compliance_status: FxHashMap::default(),
                last_security_scan: Instant::now(),
            })),
            performance_state: Arc::new(RwLock::new(RiPerformanceState {
                metrics: RiPerformanceMetrics {
                    cpu_utilization: 0.0,
                    memory_utilization: 0.0,
                    network_throughput: 0,
                    response_time: Duration::from_millis(0),
                    error_rate: 0.0,
                },
                resource_utilization: RiResourceUtilization {
                    cpu_cores: 1,
                    memory_total: 0,
                    memory_used: 0,
                    disk_total: 0,
                    disk_used: 0,
                },
                network_performance: RiNetworkPerformance {
                    latency: Duration::from_millis(0),
                    packet_loss: 0.0,
                    bandwidth_utilization: 0.0,
                    network_errors: 0,
                },
                optimizations: vec![],
                alerts: vec![],
                last_performance_check: Instant::now(),
            })),
            state_subscribers: Arc::new(RwLock::new(Vec::new())),
            version_manager,
            persistence_manager,
            initialized: Arc::new(RwLock::new(false)),
        }
    }
    
    /// Initialize the global state manager.
    pub async fn initialize(&self) -> RiResult<()> {
        if *self.initialized.read().await {
            return Ok(());
        }
        
        // Load persisted state if available
        if let Some(persisted_state) = self.persistence_manager.backend.load_state().await? {
            self.restore_state(persisted_state).await?;
        }
        
        // Update system status
        let mut global_state = self.global_state.write().await;
        global_state.system_status = RiSystemStatus::Operational;
        global_state.last_update = Instant::now();
        
        *self.initialized.write().await = true;
        Ok(())
    }
    
    /// Update system state.
    pub async fn update_state(&self, update: RiStateUpdate) -> RiResult<()> {
        if !*self.initialized.read().await {
            return Err(RiError::InvalidState("State manager not initialized".to_string()));
        }
        
        match update {
            RiStateUpdate::Global { system_status, global_config, active_protocols } => {
                self.update_global_state(system_status, global_config, active_protocols).await?;
            }
            RiStateUpdate::Protocol { protocol_type, status, config, connections } => {
                self.update_protocol_state(protocol_type, status, config, connections).await?;
            }
            RiStateUpdate::Device { device_id, device_type, status, auth_status, capabilities, supported_protocols } => {
                self.update_device_state(device_id, device_type, status, auth_status, capabilities, supported_protocols).await?;
            }
            RiStateUpdate::Security { global_security_level, threat_intelligence, security_policies } => {
                self.update_security_state(global_security_level, threat_intelligence, security_policies).await?;
            }
            RiStateUpdate::Performance { metrics, resource_utilization, network_performance } => {
                self.update_performance_state(metrics, resource_utilization, network_performance).await?;
            }
        }
        
        Ok(())
    }
    
    /// Get global state.
    pub async fn get_global_state(&self) -> RiResult<RiGlobalState> {
        Ok(self.global_state.read().await.clone())
    }
    
    /// Get protocol state.
    pub async fn get_protocol_state(&self, protocol_type: RiProtocolType) -> RiResult<Option<RiProtocolState>> {
        Ok(self.protocol_states.read().await.get(&protocol_type).cloned())
    }
    
    /// Get device state.
    pub async fn get_device_state(&self, device_id: &str) -> RiResult<Option<RiDeviceState>> {
        Ok(self.device_states.read().await.get(device_id).cloned())
    }
    
    /// Get security state.
    pub async fn get_security_state(&self) -> RiResult<RiSecurityState> {
        Ok(self.security_state.read().await.clone())
    }
    
    /// Get performance state.
    pub async fn get_performance_state(&self) -> RiResult<RiPerformanceState> {
        Ok(self.performance_state.read().await.clone())
    }
    
    /// Subscribe to state changes.
    pub async fn subscribe_state_changes(&self) -> RiResult<broadcast::Receiver<RiStateChange>> {
        let (tx, rx) = broadcast::channel(1024);
        self.state_subscribers.write().await.push(tx);
        Ok(rx)
    }
    
    /// Update global state.
    async fn update_global_state(
        &self,
        system_status: RiSystemStatus,
        global_config: RiGlobalConfig,
        active_protocols: Vec<RiProtocolType>,
    ) -> RiResult<()> {
        let mut global_state = self.global_state.write().await;
        global_state.system_status = system_status;
        global_state.global_config = global_config;
        global_state.active_protocols = active_protocols;
        global_state.last_update = Instant::now();
        global_state.version += 1;
        
        let state_change = RiStateChange {
            change_type: RiStateChangeType::Updated,
            category: RiStateCategory::Global,
            data: RiStateChangeData::Global(global_state.clone()),
            timestamp: Instant::now(),
            version: global_state.version,
        };
        
        self.notify_state_change(state_change).await?;
        self.persist_current_state().await?;
        
        Ok(())
    }
    
    /// Update protocol state.
    async fn update_protocol_state(
        &self,
        protocol_type: RiProtocolType,
        status: RiProtocolStatus,
        config: RiProtocolConfig,
        connections: Vec<RiConnectionInfo>,
    ) -> RiResult<()> {
        let protocol_state = RiProtocolState {
            protocol_type,
            status,
            config,
            connections,
            stats: RiProtocolStats::default(),
            last_heartbeat: Instant::now(),
            protocol_version: "1.0.0".to_string(),
        };
        
        self.protocol_states.write().await.insert(protocol_type, protocol_state.clone());
        
        let state_change = RiStateChange {
            change_type: RiStateChangeType::Updated,
            category: RiStateCategory::Protocol,
            data: RiStateChangeData::Protocol(protocol_state),
            timestamp: Instant::now(),
            version: self.get_next_version().await,
        };
        
        self.notify_state_change(state_change).await?;
        self.persist_current_state().await?;
        
        Ok(())
    }
    
    /// Update device state.
    async fn update_device_state(
        &self,
        device_id: String,
        device_type: RiDeviceType,
        status: RiDeviceStatus,
        auth_status: RiDeviceAuthStatus,
        capabilities: Vec<RiCapability>,
        supported_protocols: Vec<RiProtocolType>,
    ) -> RiResult<()> {
        let device_state = RiDeviceState {
            device_id: device_id.clone(),
            device_type,
            status,
            auth_status,
            capabilities,
            supported_protocols,
            last_seen: Instant::now(),
            metadata: FxHashMap::default(),
        };
        
        self.device_states.write().await.insert(device_id.clone(), device_state.clone());
        
        let state_change = RiStateChange {
            change_type: RiStateChangeType::Updated,
            category: RiStateCategory::Device,
            data: RiStateChangeData::Device(device_state),
            timestamp: Instant::now(),
            version: self.get_next_version().await,
        };
        
        self.notify_state_change(state_change).await?;
        self.persist_current_state().await?;
        
        Ok(())
    }
    
    /// Update security state.
    async fn update_security_state(
        &self,
        global_security_level: RiSecurityLevel,
        threat_intelligence: RiThreatIntelligence,
        security_policies: Vec<RiSecurityPolicy>,
    ) -> RiResult<()> {
        let mut security_state = self.security_state.write().await;
        security_state.global_security_level = global_security_level;
        security_state.threat_intelligence = threat_intelligence;
        security_state.security_policies = security_policies;
        security_state.last_security_scan = Instant::now();
        
        let state_change = RiStateChange {
            change_type: RiStateChangeType::Updated,
            category: RiStateCategory::Security,
            data: RiStateChangeData::Security(security_state.clone()),
            timestamp: Instant::now(),
            version: self.get_next_version().await,
        };
        
        self.notify_state_change(state_change).await?;
        self.persist_current_state().await?;
        
        Ok(())
    }
    
    /// Update performance state.
    async fn update_performance_state(
        &self,
        metrics: RiPerformanceMetrics,
        resource_utilization: RiResourceUtilization,
        network_performance: RiNetworkPerformance,
    ) -> RiResult<()> {
        let mut performance_state = self.performance_state.write().await;
        performance_state.metrics = metrics;
        performance_state.resource_utilization = resource_utilization;
        performance_state.network_performance = network_performance;
        performance_state.last_performance_check = Instant::now();
        
        let state_change = RiStateChange {
            change_type: RiStateChangeType::Updated,
            category: RiStateCategory::Performance,
            data: RiStateChangeData::Performance(performance_state.clone()),
            timestamp: Instant::now(),
            version: self.get_next_version().await,
        };
        
        self.notify_state_change(state_change).await?;
        self.persist_current_state().await?;
        
        Ok(())
    }
    
    /// Notify state change to subscribers.
    async fn notify_state_change(&self, change: RiStateChange) -> RiResult<()> {
        let subscribers = self.state_subscribers.read().await;
        for subscriber in subscribers.iter() {
            let _ = subscriber.send(change.clone());
        }
        Ok(())
    }
    
    /// Persist current state.
    async fn persist_current_state(&self) -> RiResult<()> {
        let snapshot = self.create_state_snapshot().await?;
        self.persistence_manager.backend.save_state(&snapshot).await?;
        Ok(())
    }
    
    /// Create state snapshot.
    async fn create_state_snapshot(&self) -> RiResult<RiStateSnapshot> {
        let global_state = self.global_state.read().await.clone();
        let protocol_states = self.protocol_states.read().await.clone();
        let device_states = self.device_states.read().await.clone();
        let security_state = self.security_state.read().await.clone();
        let performance_state = self.performance_state.read().await.clone();
        
        Ok(RiStateSnapshot {
            global_state,
            protocol_states,
            device_states,
            security_state,
            performance_state,
        })
    }
    
    /// Restore state from snapshot.
    async fn restore_state(&self, snapshot: RiStateSnapshot) -> RiResult<()> {
        *self.global_state.write().await = snapshot.global_state;
        *self.protocol_states.write().await = snapshot.protocol_states;
        *self.device_states.write().await = snapshot.device_states;
        *self.security_state.write().await = snapshot.security_state;
        *self.performance_state.write().await = snapshot.performance_state;
        Ok(())
    }
    
    /// Get next version number.
    async fn get_next_version(&self) -> u64 {
        let mut version = self.version_manager.current_version.write().await;
        *version += 1;
        *version
    }
    
    /// Shutdown the global state manager.
    pub async fn shutdown(&mut self) -> RiResult<()> {
        // Persist final state
        self.persist_current_state().await?;
        
        // Clear subscribers
        self.state_subscribers.write().await.clear();
        
        *self.initialized.write().await = false;
        Ok(())
    }
}

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

/// Memory-based state backend implementation.
struct RiMemoryStateBackend {
    state: Arc<RwLock<Option<RiStateSnapshot>>>,
    encrypted_state: Arc<RwLock<Option<Vec<u8>>>>,
}

impl RiMemoryStateBackend {
    /// Create a new memory state backend.
    fn new() -> Self {
        Self {
            state: Arc::new(RwLock::new(None)),
            encrypted_state: Arc::new(RwLock::new(None)),
        }
    }

    /// Save encrypted state data.
    async fn save_encrypted(&self, encrypted_data: Vec<u8>) -> RiResult<()> {
        *self.encrypted_state.write().await = Some(encrypted_data);
        Ok(())
    }

    /// Load encrypted state data.
    async fn load_encrypted(&self) -> RiResult<Option<Vec<u8>>> {
        Ok(self.encrypted_state.read().await.clone())
    }

    /// Encrypt state data using AES-256-GCM.
    fn encrypt_state(state: &RiStateSnapshot, key: &[u8]) -> RiResult<Vec<u8>> {
        let serialized = bincode::serialize(state)
            .map_err(|e| RiError::Serialization(e.to_string()))?;

        let key = Key::<Aes256Gcm>::from_slice(key);
        let cipher = Aes256Gcm::new(key);

        let mut nonce = [0u8; 12];
        rand::thread_rng().fill_bytes(&mut nonce);
        let nonce = Nonce::from_slice(&nonce);

        let ciphertext = cipher.encrypt(nonce, serialized.as_slice())
            .map_err(|e| RiError::CryptoError(e.to_string()))?;

        let mut result = nonce.to_vec();
        result.extend_from_slice(&ciphertext);
        Ok(result)
    }

    /// Decrypt state data using AES-256-GCM.
    fn decrypt_state(encrypted_data: &[u8], key: &[u8]) -> RiResult<Option<RiStateSnapshot>> {
        if encrypted_data.len() < 12 + 16 {
            return Ok(None);
        }

        let nonce = Nonce::from_slice(&encrypted_data[..12]);
        let ciphertext = &encrypted_data[12..];

        let key = Key::<Aes256Gcm>::from_slice(key);
        let cipher = Aes256Gcm::new(key);

        let decrypted = cipher.decrypt(nonce, ciphertext)
            .map_err(|e| RiError::CryptoError(e.to_string()))?;

        let state = bincode::deserialize(&decrypted)
            .map_err(|e| RiError::Serialization(e.to_string()))?;

        Ok(Some(state))
    }
}

#[async_trait]
impl RiStateBackend for RiMemoryStateBackend {
    async fn save_state(&self, state: &RiStateSnapshot) -> RiResult<()> {
        *self.state.write().await = Some(state.clone());
        Ok(())
    }
    
    async fn load_state(&self) -> RiResult<Option<RiStateSnapshot>> {
        Ok(self.state.read().await.clone())
    }
    
    async fn delete_state(&self) -> RiResult<()> {
        self.state.write().await.take();
        self.encrypted_state.write().await.take();
        Ok(())
    }
}