anya-core 1.2.0

// [AIR-3][AIS-3][AIM-3][BPC-3][RES-3]
use std::error::Error;
// System awareness components with BDF v2.5 compliance

/// Network state monitoring according to BDF v2.5
pub struct NetworkStateMonitor {
    // Required components
    pub mempool_threshold_kb: u64,
    pub block_version_metrics: Vec<String>,
    pub alert_system: Option<Box<dyn AlertSystem>>,
}

impl NetworkStateMonitor {
    /// Mempool monitoring with >100KB alert
    pub fn monitor_mempool_depth(&self) -> Result<MempoolStatus, Error> {
        // Implementation of mempool depth monitoring
        let depth_kb = self.get_current_mempool_depth();
        let status = if depth_kb > self.mempool_threshold_kb {
            MempoolStatus::Alert(depth_kb)
        } else {
            MempoolStatus::Normal(depth_kb)
        };
        
        // Alert if necessary
        if let MempoolStatus::Alert(_) = &status {
            if let Some(alert) = &self.alert_system {
                alert.send_alert("Mempool depth exceeds threshold");
            }
        }
        
        Ok(status)
    }
    
    fn get_current_mempool_depth(&self) -> u64 {
        // Implementation to get actual mempool depth
        // Currently returns a dummy value for demonstration
        120 // KB
    }
    
    /// Block version tracking
    pub fn track_block_version(&self) -> Result<BlockVersionMetrics, Error> {
        // Implementation of block version tracking
        let versions = self.get_recent_block_versions(100);
        let metrics = BlockVersionMetrics {
            version_counts: versions,
            total_blocks: 100,
            timestamp: chrono::Utc::now(),
        };
        
        Ok(metrics)
    }
    
    fn get_recent_block_versions(&self, count: usize) -> Vec<(u32, usize)> {
        // Implementation to get actual block versions
        // Currently returns dummy values for demonstration
        vec![(0x20000000, 92), (0x20000004, 8)]
    }
    
    // Additional required methods
}

/// Data structures for system awareness
pub enum MempoolStatus {
    Normal(u64),  // Depth in KB
    Alert(u64),   // Depth in KB when exceeding threshold
}

pub struct BlockVersionMetrics {
    pub version_counts: Vec<(u32, usize)>,  // (version, count)
    pub total_blocks: usize,
    pub timestamp: chrono::DateTime<chrono::Utc>,
}

pub enum SecurityAlert {
    PotentialFiftyOnePercentAttack {
        mining_power_percentage: f64,
        duration_minutes: u32,
    },
    FeeAnomaly {
        normal_fee_rate: f64,  // sats/vB
        current_fee_rate: f64, // sats/vB
        percentage_increase: f64,
    },
}

pub struct FeeAnalysis {
    pub current_fee_rate: f64,      // sats/vB
    pub historical_average: f64,    // sats/vB
    pub percentage_change: f64,     // %
    pub anomaly_detected: bool,
}

/// RSK Integration for Bitcoin-backed verification
pub struct RskIntegration {
    pub node_url: String,
    pub contract_address: String,
}

/// Security monitoring
pub struct SecurityMonitor {
    // Required components
    pub mining_power_threshold: f64,  // % of total hashrate
    pub fee_spike_threshold: f64,     // % increase
    pub alert_system: Option<Box<dyn AlertSystem>>,
    pub rsk_integration: Option<RskIntegration>,
}

impl SecurityMonitor {
    /// 51% attack detection
    pub fn detect_51_percent_attack(&self) -> Result<SecurityAlert, Error> {
        // Implementation of 51% attack detection
        let mining_power = self.analyze_mining_distribution()?;
        let duration = self.analyze_mining_persistence()?;
        
        if mining_power > self.mining_power_threshold {
            let alert = SecurityAlert::PotentialFiftyOnePercentAttack {
                mining_power_percentage: mining_power,
                duration_minutes: duration,
            };
            
            if let Some(alert_system) = &self.alert_system {
                alert_system.send_alert("Potential 51% attack detected");
            }
            
            return Ok(alert);
        }
        
        // Return empty alert when no threat is detected
        Ok(SecurityAlert::PotentialFiftyOnePercentAttack { 
            mining_power_percentage: mining_power, 
            duration_minutes: 0 
        })
    }
    
    fn analyze_mining_distribution(&self) -> Result<f64, Error> {
        // Implementation to analyze mining power distribution
        // Returns a dummy value for demonstration
        Ok(42.5) // % of total hashrate
    }
    
    fn analyze_mining_persistence(&self) -> Result<u32, Error> {
        // Implementation to analyze persistence of mining power concentration
        // Returns a dummy value for demonstration
        Ok(30) // minutes
    }
    
    /// Fee spike analysis
    pub fn analyze_fee_spike(&self) -> Result<FeeAnalysis, Error> {
        // Implementation of fee spike analysis
        let current = self.get_current_fee_rate()?;
        let historical = self.get_historical_average()?;
        let percentage_change = ((current - historical) / historical) * 100.0;
        
        let anomaly = percentage_change > self.fee_spike_threshold;
        if anomaly && self.alert_system.is_some() {
            self.alert_system.as_ref().unwrap()
                .send_alert("Fee spike detected");
        }
        
        Ok(FeeAnalysis {
            current_fee_rate: current,
            historical_average: historical,
            percentage_change,
            anomaly_detected: anomaly,
        })
    }
    
    fn get_current_fee_rate(&self) -> Result<f64, Error> {
        // Implementation to get current fee rate
        // Returns a dummy value for demonstration
        Ok(25.5) // sats/vB
    }
    
    fn get_historical_average(&self) -> Result<f64, Error> {
        // Implementation to get historical fee rate average
        // Returns a dummy value for demonstration
        Ok(8.2) // sats/vB
    }
    
    /// RSK Bitcoin-backed verification implementation
    #[rsk_bind]
    pub fn verify_bitcoin_payment(&self, proof: BitcoinSPV) -> Result<bool, Error> {
        // Implementation of RSK Bitcoin verification
        if self.rsk_integration.is_none() {
            return Err(Box::new(std::io::Error::new(
                std::io::ErrorKind::NotFound,
                "RSK integration not configured"
            )));
        }
        
        // Verify the merkle proof according to BDF v2.5 requirements
        let verification_result = self.verify_merkle_proof(
            proof.tx_hash,
            proof.block_header,
        )?;
        
        Ok(verification_result)
    }
    
    /// Verify a Bitcoin merkle proof
    pub fn verify_merkle_proof(&self, tx_hash: [u8; 32], block_header: BlockHeader) -> Result<bool, Error> {
        // Implementation of merkle proof verification
        // In a real implementation, this would verify the tx_hash is included
        // in the merkle tree represented by the block header
        
        // Dummy implementation for demonstration
        let merkle_root = block_header.merkle_root;
        let height = block_header.height;
        
        // Log verification attempt
        println!("Verifying tx hash {} in block at height {}", 
            hex::encode(&tx_hash),
            height);
        
        // Dummy verification logic
        Ok(true)
    }
}

/// Block header structure for Bitcoin verification
pub struct BlockHeader {
    pub version: u32,
    pub prev_block_hash: [u8; 32],
    pub merkle_root: [u8; 32],
    pub timestamp: u32,
    pub bits: u32,
    pub nonce: u32,
    pub height: u32,
}

/// Bitcoin SPV proof for RSK verification
pub struct BitcoinSPV {
    pub tx_hash: [u8; 32],
    pub block_header: BlockHeader,
    pub merkle_path: Vec<[u8; 32]>,
    pub tx_index: u32,
}

/// Alert system trait for security notifications
pub trait AlertSystem: Send + Sync {
    fn send_alert(&self, message: &str) -> Result<(), Error>;
}