dist_agent_lang 1.0.9

use crate::runtime::functions::RuntimeError;
use crate::runtime::values::Value;
/// Advanced Security Features for DAL Runtime
/// Includes MEV protection, time-locks, and formal verification support
use std::collections::{HashMap, VecDeque};
use std::time::{SystemTime, UNIX_EPOCH};

/// MEV (Maximal Extractable Value) Protection System
#[derive(Debug, Clone)]
pub struct MEVProtectionManager {
    transaction_pool: VecDeque<PendingTransaction>,
    commitment_scheme: CommitRevealScheme,
    #[allow(dead_code)]
    time_windows: HashMap<String, TimeWindow>,
    fair_ordering: FairOrderingProtocol,
}

#[derive(Debug, Clone)]
pub struct PendingTransaction {
    pub id: String,
    pub sender: String,
    pub function_call: String,
    pub args: Vec<Value>,
    pub commitment: Option<String>,
    pub reveal_data: Option<Vec<u8>>,
    pub timestamp: u64,
    pub priority_fee: u64,
    pub max_fee: u64,
}

#[derive(Debug, Clone)]
pub struct CommitRevealScheme {
    commits: HashMap<String, CommitData>,
    #[allow(dead_code)]
    reveal_deadline: u64,
    #[allow(dead_code)]
    commit_deadline: u64,
}

#[derive(Debug, Clone)]
pub struct CommitData {
    pub commitment_hash: String,
    pub sender: String,
    pub timestamp: u64,
    pub revealed: bool,
}

#[derive(Debug, Clone)]
pub struct TimeWindow {
    pub start_time: u64,
    pub end_time: u64,
    pub transactions: Vec<String>,
    pub processing_order: Vec<String>,
}

#[derive(Debug, Clone)]
pub struct FairOrderingProtocol {
    pub ordering_algorithm: OrderingAlgorithm,
    pub batch_size: usize,
    pub randomness_source: String,
}

#[derive(Debug, Clone)]
pub enum OrderingAlgorithm {
    FirstComeFirstServe,
    RandomShuffle,
    PriorityFee,
    FairBatch,
}

impl MEVProtectionManager {
    pub fn new() -> Self {
        Self {
            transaction_pool: VecDeque::new(),
            commitment_scheme: CommitRevealScheme {
                commits: HashMap::new(),
                reveal_deadline: 0,
                commit_deadline: 0,
            },
            time_windows: HashMap::new(),
            fair_ordering: FairOrderingProtocol {
                ordering_algorithm: OrderingAlgorithm::FairBatch,
                batch_size: 100,
                randomness_source: "block_hash".to_string(),
            },
        }
    }

    /// Submit a transaction with MEV protection
    pub fn submit_protected_transaction(
        &mut self,
        sender: String,
        function_call: String,
        args: Vec<Value>,
        protection_type: MEVProtectionType,
    ) -> Result<String, RuntimeError> {
        let tx_id = format!(
            "tx_{}_{}",
            sender,
            SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap()
                .as_nanos()
        );

        match protection_type {
            MEVProtectionType::CommitReveal => {
                self.submit_commit_reveal_transaction(tx_id.clone(), sender, function_call, args)?;
            }
            MEVProtectionType::TimeDelay => {
                self.submit_time_delayed_transaction(tx_id.clone(), sender, function_call, args)?;
            }
            MEVProtectionType::FairBatch => {
                self.submit_fair_batch_transaction(tx_id.clone(), sender, function_call, args)?;
            }
        }

        Ok(tx_id)
    }

    /// Commit-reveal transaction submission
    fn submit_commit_reveal_transaction(
        &mut self,
        tx_id: String,
        sender: String,
        function_call: String,
        args: Vec<Value>,
    ) -> Result<(), RuntimeError> {
        // Generate commitment hash
        let reveal_data = self.serialize_transaction_data(&function_call, &args);
        let nonce = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_nanos();
        let commitment_hash = self.generate_commitment_hash(&reveal_data, nonce);

        // Store commitment
        let commit_data = CommitData {
            commitment_hash: commitment_hash.clone(),
            sender: sender.clone(),
            timestamp: SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap()
                .as_secs(),
            revealed: false,
        };

        self.commitment_scheme
            .commits
            .insert(tx_id.clone(), commit_data);

        // Store pending transaction with commitment
        let pending_tx = PendingTransaction {
            id: tx_id,
            sender,
            function_call,
            args,
            commitment: Some(commitment_hash),
            reveal_data: Some(reveal_data),
            timestamp: SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap()
                .as_secs(),
            priority_fee: 0,
            max_fee: 0,
        };

        self.transaction_pool.push_back(pending_tx);
        Ok(())
    }

    /// Time-delayed transaction submission
    fn submit_time_delayed_transaction(
        &mut self,
        tx_id: String,
        sender: String,
        function_call: String,
        args: Vec<Value>,
    ) -> Result<(), RuntimeError> {
        let now = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_secs();
        let delay_window = 300; // 5 minutes

        let pending_tx = PendingTransaction {
            id: tx_id.clone(),
            sender,
            function_call,
            args,
            commitment: None,
            reveal_data: None,
            timestamp: now + delay_window, // Execute after delay
            priority_fee: 0,
            max_fee: 0,
        };

        self.transaction_pool.push_back(pending_tx);
        Ok(())
    }

    /// Fair batch transaction submission
    fn submit_fair_batch_transaction(
        &mut self,
        tx_id: String,
        sender: String,
        function_call: String,
        args: Vec<Value>,
    ) -> Result<(), RuntimeError> {
        let pending_tx = PendingTransaction {
            id: tx_id,
            sender,
            function_call,
            args,
            commitment: None,
            reveal_data: None,
            timestamp: SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap()
                .as_secs(),
            priority_fee: 0,
            max_fee: 0,
        };

        self.transaction_pool.push_back(pending_tx);

        // Process batch if full
        if self.transaction_pool.len() >= self.fair_ordering.batch_size {
            self.process_fair_batch()?;
        }

        Ok(())
    }

    /// Process a fair batch of transactions
    fn process_fair_batch(&mut self) -> Result<Vec<String>, RuntimeError> {
        let batch_size = self
            .fair_ordering
            .batch_size
            .min(self.transaction_pool.len());
        let mut batch: Vec<PendingTransaction> = Vec::new();

        for _ in 0..batch_size {
            if let Some(tx) = self.transaction_pool.pop_front() {
                batch.push(tx);
            }
        }

        // Apply fair ordering
        match self.fair_ordering.ordering_algorithm {
            OrderingAlgorithm::RandomShuffle => {
                use rand::seq::SliceRandom;
                let mut rng = rand::thread_rng();
                batch.shuffle(&mut rng);
            }
            OrderingAlgorithm::FairBatch => {
                // Implement fair ordering based on timestamp and randomness
                batch.sort_by(|a, b| {
                    let a_score = self.calculate_fairness_score(a);
                    let b_score = self.calculate_fairness_score(b);
                    a_score.partial_cmp(&b_score).unwrap()
                });
            }
            _ => {
                // Keep existing order
            }
        }

        // Return ordered transaction IDs
        Ok(batch.iter().map(|tx| tx.id.clone()).collect())
    }

    /// Calculate fairness score for transaction ordering
    fn calculate_fairness_score(&self, tx: &PendingTransaction) -> f64 {
        let time_factor = tx.timestamp as f64;
        let randomness = self.get_block_randomness() as f64;

        // Combine timestamp with randomness to prevent manipulation
        (time_factor + randomness) % 1000000.0
    }

    /// Get block randomness for fair ordering
    fn get_block_randomness(&self) -> u64 {
        // In practice, this would use VRF or block hash
        SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_nanos() as u64
            % 1000000
    }

    /// Generate commitment hash for commit-reveal scheme
    fn generate_commitment_hash(&self, data: &[u8], nonce: u128) -> String {
        use sha2::{Digest, Sha256};

        let mut hasher = Sha256::new();
        hasher.update(data);
        hasher.update(nonce.to_be_bytes());
        format!("{:x}", hasher.finalize())
    }

    /// Serialize transaction data for hashing
    fn serialize_transaction_data(&self, function_call: &str, args: &[Value]) -> Vec<u8> {
        format!("{}:{:?}", function_call, args).into_bytes()
    }

    /// Analyze transaction for MEV attacks
    /// Returns warnings instead of blocking for monitoring code
    pub fn analyze_transaction(&mut self, transaction_data: &str) -> Result<(), RuntimeError> {
        // Basic MEV detection heuristics
        let suspicious_patterns = [
            "sandwich",
            "frontrun",
            "backrun",
            "arbitrage",
            "liquidation",
            "flashloan",
        ];

        let data_lower = transaction_data.to_lowercase();

        // Check if this is monitoring code (find_*, detect_*, analyze_*, monitor_*, get_*)
        let is_monitoring = self.is_monitoring_code(&data_lower);

        // Check if protection patterns are present
        let has_protection = self.has_protection_patterns(&data_lower);

        for pattern in &suspicious_patterns {
            if data_lower.contains(pattern) {
                // If it's monitoring code, allow it (just log info)
                if is_monitoring {
                    // Monitoring code is OK - don't block
                    // Could log: "MEV keyword in monitoring function - OK"
                    continue;
                }

                // If protection patterns exist, allow it (already protected)
                if has_protection {
                    // Protection detected - don't block
                    // Could log: "MEV pattern detected but protection present - OK"
                    continue;
                }

                // Only block if it's execution code without protection
                // This prevents false positives for legitimate monitoring/analytics
                return Err(RuntimeError::General(format!(
                    "Potential MEV attack detected: {}. Consider adding protection patterns (commit-reveal, slippage checks, oracle validation)",
                    pattern
                )));
            }
        }

        // Check for rapid successive transactions (potential MEV bot behavior)
        // Only block if not monitoring code
        if !is_monitoring && (data_lower.contains("urgent") || data_lower.contains("priority")) {
            return Err(RuntimeError::General(
                "High-priority transaction flagged for MEV review".to_string(),
            ));
        }

        Ok(())
    }

    /// Check if code is monitoring/analytics (read-only, not execution)
    fn is_monitoring_code(&self, code: &str) -> bool {
        let monitoring_patterns = [
            "fn find_",
            "fn detect_",
            "fn analyze_",
            "fn monitor_",
            "fn get_",
            "fn check_",
            "fn query_",
            "fn calculate_",
            "find_price",
            "detect_price",
            "analyze_price",
            "monitor_liquidity",
            "price_difference",
            "market_opportunities", // Common monitoring patterns
        ];

        monitoring_patterns
            .iter()
            .any(|pattern| code.contains(pattern))
    }

    /// Check if protection patterns are present
    fn has_protection_patterns(&self, code: &str) -> bool {
        let protection_patterns = [
            "commit_reveal",
            "commit-reveal",
            "commitment_hash",
            "commitment",
            "slippage",
            "min_amount_out",
            "max_slippage",
            "oracle_price",
            "get_oracle_price",
            "price_oracle",
            "fair_batch",
            "time_delay",
            "protected_swap",
            "execute_protected",
            "execute_single_chain_swap_protected",
        ];

        protection_patterns
            .iter()
            .any(|pattern| code.contains(pattern))
    }
}

#[derive(Debug, Clone)]
pub enum MEVProtectionType {
    CommitReveal,
    TimeDelay,
    FairBatch,
}

/// Time-lock mechanism for delayed execution
#[derive(Debug, Clone)]
pub struct TimeLockManager {
    locked_operations: HashMap<String, TimeLockOperation>,
    time_lock_configs: HashMap<String, TimeLockConfig>,
}

#[derive(Debug, Clone)]
pub struct TimeLockOperation {
    pub operation_id: String,
    pub operation_type: String,
    pub data: Vec<u8>,
    pub creator: String,
    pub created_at: u64,
    pub unlock_time: u64,
    pub executed: bool,
    pub cancelled: bool,
    pub required_approvals: Vec<String>,
    pub current_approvals: Vec<String>,
}

#[derive(Debug, Clone)]
pub struct TimeLockConfig {
    pub min_delay: u64,
    pub max_delay: u64,
    pub required_approvers: Vec<String>,
    pub min_approvals: u32,
    pub emergency_guardian: Option<String>,
    pub can_cancel: bool,
}

impl TimeLockManager {
    pub fn new() -> Self {
        Self {
            locked_operations: HashMap::new(),
            time_lock_configs: HashMap::new(),
        }
    }

    /// Create a time-locked operation
    pub fn create_time_lock(
        &mut self,
        operation_type: String,
        data: Vec<u8>,
        creator: String,
        delay_seconds: u64,
        required_approvals: Vec<String>,
    ) -> Result<String, RuntimeError> {
        let config = self.time_lock_configs.get(&operation_type).ok_or_else(|| {
            RuntimeError::General("Time-lock configuration not found".to_string())
        })?;

        // Validate delay
        if delay_seconds < config.min_delay || delay_seconds > config.max_delay {
            return Err(RuntimeError::General(format!(
                "Invalid delay: must be between {} and {} seconds",
                config.min_delay, config.max_delay
            )));
        }

        let now = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_secs();
        let operation_id = format!("timelock_{}_{}", operation_type, now);

        let time_lock_op = TimeLockOperation {
            operation_id: operation_id.clone(),
            operation_type,
            data,
            creator,
            created_at: now,
            unlock_time: now + delay_seconds,
            executed: false,
            cancelled: false,
            required_approvals,
            current_approvals: Vec::new(),
        };

        self.locked_operations
            .insert(operation_id.clone(), time_lock_op);
        Ok(operation_id)
    }

    /// Approve a time-locked operation
    pub fn approve_operation(
        &mut self,
        operation_id: &str,
        approver: &str,
    ) -> Result<(), RuntimeError> {
        let operation = self
            .locked_operations
            .get_mut(operation_id)
            .ok_or_else(|| RuntimeError::General("Operation not found".to_string()))?;

        if operation.executed || operation.cancelled {
            return Err(RuntimeError::General(
                "Operation already completed".to_string(),
            ));
        }

        // Check if approver is authorized
        if !operation.required_approvals.contains(&approver.to_string()) {
            return Err(RuntimeError::General("Unauthorized approver".to_string()));
        }

        // Check if already approved
        if operation.current_approvals.contains(&approver.to_string()) {
            return Err(RuntimeError::General(
                "Already approved by this approver".to_string(),
            ));
        }

        operation.current_approvals.push(approver.to_string());
        Ok(())
    }

    /// Execute a time-locked operation
    pub fn execute_operation(
        &mut self,
        operation_id: &str,
        executor: &str,
    ) -> Result<Vec<u8>, RuntimeError> {
        let operation = self
            .locked_operations
            .get_mut(operation_id)
            .ok_or_else(|| RuntimeError::General("Operation not found".to_string()))?;

        if operation.executed {
            return Err(RuntimeError::General(
                "Operation already executed".to_string(),
            ));
        }

        if operation.cancelled {
            return Err(RuntimeError::General("Operation was cancelled".to_string()));
        }

        let now = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_secs();
        if now < operation.unlock_time {
            return Err(RuntimeError::General(
                "Operation is still time-locked".to_string(),
            ));
        }

        // Check if sufficient approvals
        let config = self
            .time_lock_configs
            .get(&operation.operation_type)
            .ok_or_else(|| {
                RuntimeError::General("Time-lock configuration not found".to_string())
            })?;

        if operation.current_approvals.len() < config.min_approvals as usize {
            return Err(RuntimeError::General("Insufficient approvals".to_string()));
        }

        // Check if executor is authorized (creator or approver)
        if executor != operation.creator
            && !operation.current_approvals.contains(&executor.to_string())
        {
            return Err(RuntimeError::General("Unauthorized executor".to_string()));
        }

        operation.executed = true;
        Ok(operation.data.clone())
    }

    /// Cancel a time-locked operation (emergency guardian only)
    pub fn cancel_operation(
        &mut self,
        operation_id: &str,
        canceller: &str,
    ) -> Result<(), RuntimeError> {
        let operation = self
            .locked_operations
            .get_mut(operation_id)
            .ok_or_else(|| RuntimeError::General("Operation not found".to_string()))?;

        if operation.executed {
            return Err(RuntimeError::General(
                "Cannot cancel executed operation".to_string(),
            ));
        }

        if operation.cancelled {
            return Err(RuntimeError::General(
                "Operation already cancelled".to_string(),
            ));
        }

        let config = self
            .time_lock_configs
            .get(&operation.operation_type)
            .ok_or_else(|| {
                RuntimeError::General("Time-lock configuration not found".to_string())
            })?;

        if !config.can_cancel {
            return Err(RuntimeError::General(
                "Operation cannot be cancelled".to_string(),
            ));
        }

        // Check if canceller is emergency guardian
        if let Some(ref guardian) = config.emergency_guardian {
            if canceller != guardian {
                return Err(RuntimeError::General(
                    "Only emergency guardian can cancel".to_string(),
                ));
            }
        } else {
            return Err(RuntimeError::General(
                "No emergency guardian configured".to_string(),
            ));
        }

        operation.cancelled = true;
        Ok(())
    }

    /// Add time-lock configuration
    pub fn add_config(&mut self, operation_type: String, config: TimeLockConfig) {
        self.time_lock_configs.insert(operation_type, config);
    }

    /// Check if function is time-locked
    pub fn check_lock(&self, function_name: &str) -> Result<(), RuntimeError> {
        // Check if this function type has a time-lock configuration
        for (operation_type, _config) in &self.time_lock_configs {
            if function_name.contains(operation_type) {
                // Check if there's an active lock for this specific function
                let lock_key = format!("{}:{}", operation_type, function_name);
                if let Some(operation) = self.locked_operations.get(&lock_key) {
                    if !operation.executed && !operation.cancelled {
                        let current_time = std::time::SystemTime::now()
                            .duration_since(std::time::UNIX_EPOCH)
                            .unwrap_or_default()
                            .as_secs();

                        if current_time < operation.unlock_time {
                            return Err(RuntimeError::General(format!(
                                "Function '{}' is time-locked until timestamp: {}",
                                function_name, operation.unlock_time
                            )));
                        }
                    }
                }
            }
        }

        Ok(())
    }
}

/// Formal verification support structures
#[derive(Debug, Clone)]
pub struct FormalVerificationManager {
    contract_specifications: HashMap<String, ContractSpecification>,
    verification_results: HashMap<String, VerificationResult>,
    proof_cache: HashMap<String, ProofData>,
}

#[derive(Debug, Clone)]
pub struct ContractSpecification {
    pub contract_name: String,
    pub invariants: Vec<Invariant>,
    pub preconditions: Vec<Condition>,
    pub postconditions: Vec<Condition>,
    pub safety_properties: Vec<SafetyProperty>,
    pub liveness_properties: Vec<LivenessProperty>,
}

#[derive(Debug, Clone)]
pub struct Invariant {
    pub name: String,
    pub condition: String,
    pub description: String,
}

#[derive(Debug, Clone)]
pub struct Condition {
    pub name: String,
    pub expression: String,
    pub description: String,
}

#[derive(Debug, Clone)]
pub struct SafetyProperty {
    pub name: String,
    pub property: String,
    pub violation_consequence: String,
}

#[derive(Debug, Clone)]
pub struct LivenessProperty {
    pub name: String,
    pub property: String,
    pub timeout: Option<u64>,
}

#[derive(Debug, Clone)]
pub struct VerificationResult {
    pub contract_name: String,
    pub verified_at: u64,
    pub passed: bool,
    pub failed_properties: Vec<String>,
    pub warnings: Vec<String>,
    pub proof_size: usize,
}

#[derive(Debug, Clone)]
pub struct ProofData {
    pub property_name: String,
    pub proof_method: String,
    pub proof_steps: Vec<String>,
    pub verification_time: u64,
}

impl FormalVerificationManager {
    pub fn new() -> Self {
        Self {
            contract_specifications: HashMap::new(),
            verification_results: HashMap::new(),
            proof_cache: HashMap::new(),
        }
    }

    /// Add contract specification for verification
    pub fn add_specification(&mut self, spec: ContractSpecification) {
        self.contract_specifications
            .insert(spec.contract_name.clone(), spec);
    }

    /// Verify contract against specification
    pub fn verify_contract(
        &mut self,
        contract_name: &str,
        contract_code: &str,
    ) -> Result<VerificationResult, RuntimeError> {
        let spec = self
            .contract_specifications
            .get(contract_name)
            .ok_or_else(|| RuntimeError::General("Contract specification not found".to_string()))?;

        let mut failed_properties = Vec::new();
        let mut warnings = Vec::new();

        // Verify invariants
        for invariant in &spec.invariants {
            if !self.check_invariant(contract_code, invariant) {
                failed_properties.push(format!("Invariant: {}", invariant.name));
            }
        }

        // Verify safety properties
        for safety_prop in &spec.safety_properties {
            if !self.check_safety_property(contract_code, safety_prop) {
                failed_properties.push(format!("Safety: {}", safety_prop.name));
            }
        }

        // Verify liveness properties
        for liveness_prop in &spec.liveness_properties {
            if !self.check_liveness_property(contract_code, liveness_prop) {
                warnings.push(format!(
                    "Liveness property may not hold: {}",
                    liveness_prop.name
                ));
            }
        }

        let result = VerificationResult {
            contract_name: contract_name.to_string(),
            verified_at: SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap()
                .as_secs(),
            passed: failed_properties.is_empty(),
            failed_properties,
            warnings,
            proof_size: contract_code.len(),
        };

        self.verification_results
            .insert(contract_name.to_string(), result.clone());
        Ok(result)
    }

    /// Check invariant holds for contract
    fn check_invariant(&self, _contract_code: &str, invariant: &Invariant) -> bool {
        // Simplified invariant checking - in practice would use SMT solvers
        // For demonstration, assume basic invariants pass
        !invariant.condition.contains("false")
    }

    /// Check safety property holds for contract
    fn check_safety_property(&self, _contract_code: &str, safety_prop: &SafetyProperty) -> bool {
        // Simplified safety checking - in practice would use model checking
        // For demonstration, assume basic safety properties pass
        !safety_prop.property.contains("unsafe")
    }

    /// Check liveness property holds for contract
    fn check_liveness_property(
        &self,
        _contract_code: &str,
        liveness_prop: &LivenessProperty,
    ) -> bool {
        // Simplified liveness checking - in practice would use temporal logic
        // For demonstration, assume basic liveness properties pass
        !liveness_prop.property.contains("deadlock")
    }

    /// Get verification result for contract
    pub fn get_verification_result(&self, contract_name: &str) -> Option<&VerificationResult> {
        self.verification_results.get(contract_name)
    }

    /// Generate formal proof for property
    pub fn generate_proof(
        &mut self,
        contract_name: &str,
        property_name: &str,
    ) -> Result<ProofData, RuntimeError> {
        let spec = self
            .contract_specifications
            .get(contract_name)
            .ok_or_else(|| RuntimeError::General("Contract specification not found".to_string()))?;

        // Find property in specification
        let property_found = spec
            .invariants
            .iter()
            .find(|inv| inv.name == property_name)
            .is_some()
            || spec
                .safety_properties
                .iter()
                .find(|sp| sp.name == property_name)
                .is_some();

        if !property_found {
            return Err(RuntimeError::General(
                "Property not found in specification".to_string(),
            ));
        }

        // Generate proof steps (simplified)
        let proof_steps = vec![
            "1. Assume contract invariants hold".to_string(),
            "2. Consider all possible state transitions".to_string(),
            "3. Verify property holds in all reachable states".to_string(),
            "4. Conclude property is verified".to_string(),
        ];

        let proof = ProofData {
            property_name: property_name.to_string(),
            proof_method: "Inductive Verification".to_string(),
            proof_steps,
            verification_time: SystemTime::now()
                .duration_since(UNIX_EPOCH)
                .unwrap()
                .as_secs(),
        };

        let proof_key = format!("{}::{}", contract_name, property_name);
        self.proof_cache.insert(proof_key, proof.clone());

        Ok(proof)
    }
}

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

    #[test]
    fn test_mev_protection_commit_reveal() {
        let mut mev_manager = MEVProtectionManager::new();

        let result = mev_manager.submit_protected_transaction(
            "user1".to_string(),
            "transfer".to_string(),
            vec![Value::String("recipient".to_string()), Value::Int(100)],
            MEVProtectionType::CommitReveal,
        );

        assert!(result.is_ok());
        assert_eq!(mev_manager.transaction_pool.len(), 1);
    }

    #[test]
    fn test_time_lock_creation() {
        let mut timelock_manager = TimeLockManager::new();

        // Add configuration
        let config = TimeLockConfig {
            min_delay: 3600,  // 1 hour
            max_delay: 86400, // 24 hours
            required_approvers: vec!["approver1".to_string(), "approver2".to_string()],
            min_approvals: 2,
            emergency_guardian: Some("guardian".to_string()),
            can_cancel: true,
        };
        timelock_manager.add_config("upgrade".to_string(), config);

        let result = timelock_manager.create_time_lock(
            "upgrade".to_string(),
            b"upgrade_data".to_vec(),
            "admin".to_string(),
            7200, // 2 hours
            vec!["approver1".to_string(), "approver2".to_string()],
        );

        assert!(result.is_ok());
    }

    #[test]
    fn test_formal_verification() {
        let mut verifier = FormalVerificationManager::new();

        let spec = ContractSpecification {
            contract_name: "TestContract".to_string(),
            invariants: vec![Invariant {
                name: "balance_non_negative".to_string(),
                condition: "balance >= 0".to_string(),
                description: "Balance must always be non-negative".to_string(),
            }],
            preconditions: vec![],
            postconditions: vec![],
            safety_properties: vec![SafetyProperty {
                name: "no_overflow".to_string(),
                property: "addition_no_overflow".to_string(),
                violation_consequence: "Integer overflow".to_string(),
            }],
            liveness_properties: vec![],
        };

        verifier.add_specification(spec);

        let result = verifier.verify_contract("TestContract", "contract code here");
        assert!(result.is_ok());
        assert!(result.unwrap().passed);
    }
}

/// Unified Advanced Security Manager that combines all advanced security features
#[derive(Debug, Clone)]
pub struct AdvancedSecurityManager {
    pub mev_protection: MEVProtectionManager,
    pub timelock_manager: TimeLockManager,
    pub formal_verification: FormalVerificationManager,
}

impl AdvancedSecurityManager {
    pub fn new() -> Self {
        Self {
            mev_protection: MEVProtectionManager::new(),
            timelock_manager: TimeLockManager::new(),
            formal_verification: FormalVerificationManager::new(),
        }
    }

    /// Analyze transaction for MEV attacks
    pub fn analyze_transaction_for_mev(
        &mut self,
        transaction_data: &str,
    ) -> Result<(), RuntimeError> {
        self.mev_protection.analyze_transaction(transaction_data)
    }

    /// Check timelock restrictions for sensitive functions
    pub fn check_timelock(&self, function_name: &str) -> Result<(), RuntimeError> {
        self.timelock_manager.check_lock(function_name)
    }

    /// Verify assignment using formal verification
    pub fn verify_assignment(
        &mut self,
        variable_name: &str,
        value: &Value,
    ) -> Result<(), RuntimeError> {
        // Create a simple assignment verification
        let contract_code = format!("let {} = {:?};", variable_name, value);
        // Only verify if a specification exists - otherwise skip (optional verification)
        if self
            .formal_verification
            .contract_specifications
            .contains_key("assignment")
        {
            let result = self
                .formal_verification
                .verify_contract("assignment", &contract_code)?;

            if result.passed {
                Ok(())
            } else {
                Err(RuntimeError::General(format!(
                    "Formal verification failed for assignment: {}",
                    variable_name
                )))
            }
        } else {
            // No specification exists, skip verification
            Ok(())
        }
    }
}