quantrs2-device 0.1.3

//! State management implementations for distributed quantum computation

use super::super::types::*;
use async_trait::async_trait;
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Duration;

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

impl DistributedStateManager {
    pub fn new() -> Self {
        Self {
            local_states: Arc::new(std::sync::RwLock::new(HashMap::new())),
            entanglement_registry: Arc::new(std::sync::RwLock::new(HashMap::new())),
            synchronization_protocol: Arc::new(BasicSynchronizationProtocol::new()),
            state_transfer_engine: Arc::new(StateTransferEngine::new()),
            consistency_checker: Arc::new(ConsistencyChecker::new()),
        }
    }
}

/// Basic synchronization protocol implementation
#[derive(Debug)]
pub struct BasicSynchronizationProtocol;

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

impl BasicSynchronizationProtocol {
    pub const fn new() -> Self {
        Self
    }
}

#[async_trait]
impl StateSynchronizationProtocol for BasicSynchronizationProtocol {
    async fn synchronize_states(
        &self,
        nodes: &[NodeId],
        target_consistency: f64,
    ) -> Result<SynchronizationResult> {
        Ok(SynchronizationResult {
            success: true,
            consistency_level: target_consistency,
            synchronized_nodes: nodes.to_vec(),
            failed_nodes: vec![],
            synchronization_time: Duration::from_millis(50),
        })
    }

    async fn detect_inconsistencies(
        &self,
        _states: &HashMap<NodeId, LocalQuantumState>,
    ) -> Vec<Inconsistency> {
        vec![] // Simplified
    }

    async fn resolve_conflicts(&self, conflicts: &[StateConflict]) -> Result<Resolution> {
        Ok(Resolution {
            strategy: ResolutionStrategy::LastWriterWins,
            resolved_conflicts: conflicts.iter().map(|c| c.conflict_id).collect(),
            unresolved_conflicts: vec![],
            resolution_time: Duration::from_millis(10),
        })
    }
}

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

impl StateTransferEngine {
    pub fn new() -> Self {
        Self {
            transfer_protocols: HashMap::new(),
            compression_engine: Arc::new(QuantumStateCompressor::new()),
            encryption_engine: Arc::new(QuantumCryptography::new()),
        }
    }
}

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

impl QuantumStateCompressor {
    pub fn new() -> Self {
        Self {
            compression_algorithms: vec![
                "quantum_huffman".to_string(),
                "schmidt_decomposition".to_string(),
            ],
            compression_ratio_target: 0.5,
            fidelity_preservation_threshold: 0.99,
        }
    }
}

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

impl QuantumCryptography {
    pub fn new() -> Self {
        Self {
            encryption_protocols: vec![
                "quantum_key_distribution".to_string(),
                "post_quantum_crypto".to_string(),
            ],
            key_distribution_method: "BB84".to_string(),
            security_level: 256,
        }
    }
}

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

impl ConsistencyChecker {
    pub fn new() -> Self {
        Self {
            consistency_protocols: vec![
                "eventual_consistency".to_string(),
                "strong_consistency".to_string(),
            ],
            verification_frequency: Duration::from_secs(1),
            automatic_correction: true,
        }
    }
}