foxhunt/src/bin/trading_service.rs

//! Standalone Trading Service Binary
//!
//! This binary provides a standalone gRPC server for the Trading Service,
//! integrating all trading operations, risk management, monitoring, configuration,
//! and system status functionality.
//!
//! The service listens on port 50051 and provides comprehensive trading functionality.

use std::net::SocketAddr;
use std::sync::Arc;
use tokio::signal;
use tonic::transport::Server;
use tracing::{error, info, Level};
use tracing_subscriber::FmtSubscriber;
use rand::random;
use tokio::sync::Mutex;

// Import core functionality
use core::trading::{OrderManager, PositionManager};
use core::config::ConfigManager;
use risk::{RiskEngine, RiskConfig};
use core::types::{TradingOrder, Side, OrderType, TimeInForce, OrderStatus};
use core::types::prelude::*;

// Import proto definitions and service implementations
use tli::proto::trading::trading_service_server::TradingServiceServer;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Initialize tracing
    let subscriber = FmtSubscriber::builder()
        .with_max_level(Level::INFO)
        .finish();

    tracing::subscriber::set_global_default(subscriber).expect("Setting default subscriber failed");

    info!("Starting Foxhunt Trading Service...");

    // Load configuration
    let config_manager = ConfigManager::load_from_environment()
        .map_err(|e| format!("Failed to load configuration: {}", e))?;
    let config_manager = Arc::new(config_manager);

    // Create trading service implementation
    let trading_service = TradingServiceImpl::new(Arc::clone(&config_manager)).await?;

    // Server address
    let addr: SocketAddr = "0.0.0.0:50051".parse()?;
    info!("Trading Service listening on {}", addr);

    // Setup graceful shutdown
    let shutdown_signal = async {
        signal::ctrl_c()
            .await
            .expect("Failed to install CTRL+C signal handler");
        info!("Received shutdown signal, stopping Trading Service...");
    };

    // Build and start the server
    let server = Server::builder()
        .add_service(TradingServiceServer::new(trading_service))
        .serve_with_shutdown(addr, shutdown_signal);

    info!("Trading Service started successfully on {}", addr);

    if let Err(e) = server.await {
        error!("Trading Service failed: {}", e);
        return Err(e.into());
    }

    info!("Trading Service stopped gracefully");
    Ok(())
}

/// Trading Service Implementation
/// Integrates all trading operations, risk management, monitoring, configuration, and system status
pub struct TradingServiceImpl {
    config_manager: Arc<ConfigManager>,
    order_manager: Arc<OrderManager>,
    position_manager: Arc<PositionManager>,
    risk_engine: Arc<RiskEngine>,
    market_data_service: Option<Arc<dyn risk::MarketDataService>>,
}

impl TradingServiceImpl {
    pub async fn new(
        config_manager: Arc<ConfigManager>,
    ) -> Result<Self, Box<dyn std::error::Error>> {
        info!("Initializing Trading Service components...");

        // Initialize core components
        let order_manager = Arc::new(OrderManager::new());
        let position_manager = Arc::new(PositionManager::new());
        
        // Initialize risk engine with default configuration
        let risk_config = RiskConfig::default();
        let market_data_service = Arc::new(MockMarketDataService);
        let risk_engine = Arc::new(
            RiskEngine::new(risk_config, market_data_service.clone(), None)
                .await
                .map_err(|e| format!("Failed to initialize risk engine: {:?}", e))?
        );

        Ok(TradingServiceImpl { config_manager, order_manager, position_manager, risk_engine, market_data_service: Some(market_data_service) })
    }
}

// Implement the gRPC service trait
#[tonic::async_trait]
impl tli::proto::trading::trading_service_server::TradingService for TradingServiceImpl {
    async fn submit_order(
        &self,
        request: tonic::Request<tli::proto::trading::SubmitOrderRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::SubmitOrderResponse>, tonic::Status> {
        let req = request.into_inner();
        info!("Received order submission for symbol: {}", req.symbol);

        // Convert gRPC request to internal order structure
        let order_side = match req.side {
            0 => Side::Buy,
            1 => Side::Sell,
            _ => return Err(tonic::Status::invalid_argument("Invalid order side")),
        };

        let order_type = match req.order_type {
            0 => OrderType::Market,
            1 => OrderType::Limit,
            _ => return Err(tonic::Status::invalid_argument("Invalid order type")),
        };

        let order_id = OrderId::from(format!("ORDER_{}", uuid::Uuid::new_v4()));
        let trading_order = TradingOrder {
            id: order_id.clone(),
            symbol: req.symbol.clone(),
            side: order_side,
            order_type,
            quantity: Decimal::from_f64(req.quantity)
                .ok_or_else(|| tonic::Status::invalid_argument("Invalid quantity"))?,
            price: Decimal::from_f64(req.price.unwrap_or(0.0))
                .ok_or_else(|| tonic::Status::invalid_argument("Invalid price"))?,
            time_in_force: TimeInForce::GTC,
            metadata: std::collections::HashMap::new(),
            created_at: chrono::Utc::now(),
            submitted_at: None,
            executed_at: None,
            status: OrderStatus::Created,
            fill_quantity: Decimal::ZERO,
            average_fill_price: None,
        };

        // Validate order
        if let Err(error_msg) = self.order_manager.validate_order(&trading_order).await {
            return Err(tonic::Status::invalid_argument(format!("Order validation failed: {}", error_msg)));
        }

        // Add order to tracking
        self.order_manager.add_order(trading_order).await;

        // Update order status to submitted
        let _ = self.order_manager.update_order_status(&order_id, OrderStatus::Submitted).await;

        let response = tli::proto::trading::SubmitOrderResponse {
            success: true,
            order_id: order_id.to_string(),
            message: "Order submitted successfully".to_string(),
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    async fn cancel_order(
        &self,
        request: tonic::Request<tli::proto::trading::CancelOrderRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::CancelOrderResponse>, tonic::Status> {
        let req = request.into_inner();
        info!("Received order cancellation for order_id: {}", req.order_id);

        // TODO: Implement actual order cancellation logic
        let response = tli::proto::trading::CancelOrderResponse {
            success: true,
            message: "Order cancelled successfully".to_string(),
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_order_status(
        &self,
        request: tonic::Request<tli::proto::trading::GetOrderStatusRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetOrderStatusResponse>, tonic::Status> {
        let req = request.into_inner();
        info!(
            "Received order status request for order_id: {}",
            req.order_id
        );

        // TODO: Implement actual order status lookup
        let response = tli::proto::trading::GetOrderStatusResponse {
            order_id: req.order_id.clone(),
            symbol: "AAPL".to_string(),
            side: tli::proto::trading::OrderSide::Buy as i32,
            order_type: tli::proto::trading::OrderType::Market as i32,
            quantity: 100.0,
            filled_quantity: 100.0,
            remaining_quantity: 0.0,
            average_price: 150.50,
            status: tli::proto::trading::OrderStatus::Filled as i32,
            created_at_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
            updated_at_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_account_info(
        &self,
        _request: tonic::Request<tli::proto::trading::GetAccountInfoRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetAccountInfoResponse>, tonic::Status> {
        info!("Received account info request");

        // TODO: Implement actual account info retrieval
        let response = tli::proto::trading::GetAccountInfoResponse {
            account_id: "ACCOUNT_123".to_string(),
            total_value: 100000.0,
            cash_balance: 20000.0,
            buying_power: 80000.0,
            maintenance_margin: 5000.0,
            day_trading_buying_power: 160000.0,
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_positions(
        &self,
        _request: tonic::Request<tli::proto::trading::GetPositionsRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetPositionsResponse>, tonic::Status> {
        info!("Received positions request");

        // Get positions from PositionManager
        let positions_result = self.position_manager.get_positions(None).await;
        match positions_result {
            Ok(positions) => {
                let proto_positions: Vec<tli::proto::trading::Position> = positions
                    .into_iter()
                    .map(|pos| tli::proto::trading::Position {
                        symbol: pos.symbol.to_string(),
                        quantity: pos.quantity.to_f64(),
                        average_price: pos.avg_cost.to_f64(),
                        market_value: pos.market_value.to_f64(),
                        unrealized_pnl: pos.unrealized_pnl.to_f64(),
                        last_updated_unix_nanos: pos.last_updated.timestamp_nanos_opt().unwrap_or(0),
                    })
                    .collect();

        let response = tli::proto::trading::GetPositionsResponse {
                    positions: proto_positions,
                };
                Ok(tonic::Response::new(response))
            }
            Err(error_msg) => Err(tonic::Status::internal(format!("Failed to get positions: {}", error_msg))),
        }
        };

        Ok(tonic::Response::new(response))
    }

    // Stream methods require different implementations
    type SubscribeMarketDataStream = tokio_stream::wrappers::ReceiverStream<
        Result<tli::proto::trading::MarketDataEvent, tonic::Status>,
    >;

    async fn subscribe_market_data(
        &self,
        _request: tonic::Request<tli::proto::trading::SubscribeMarketDataRequest>,
    ) -> Result<tonic::Response<Self::SubscribeMarketDataStream>, tonic::Status> {
        info!("Received market data subscription request");

        let (tx, rx) = tokio::sync::mpsc::channel(100);

        // TODO: Implement actual market data streaming
        tokio::spawn(async move {
            // Send periodic market data updates
            let mut interval = tokio::time::interval(tokio::time::Duration::from_secs(1));
            loop {
                interval.tick().await;
                let event = tli::proto::trading::MarketDataEvent {
                    event: Some(tli::proto::trading::market_data_event::Event::Tick(
                        tli::proto::trading::TickData {
                            symbol: "AAPL".to_string(),
                            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                            price: 150.0 + (rand::random::<f64>() - 0.5) * 2.0,
                            size: 1000,
                            exchange: "NASDAQ".to_string(),
                        }
                    )),
                };

                if tx.send(Ok(event)).await.is_err() {
                    break;
                }
            }
        });

        Ok(tonic::Response::new(
            tokio_stream::wrappers::ReceiverStream::new(rx),
        ))
    }

    type SubscribeOrderUpdatesStream = tokio_stream::wrappers::ReceiverStream<
        Result<tli::proto::trading::OrderUpdateEvent, tonic::Status>,
    >;

    async fn subscribe_order_updates(
        &self,
        _request: tonic::Request<tli::proto::trading::SubscribeOrderUpdatesRequest>,
    ) -> Result<tonic::Response<Self::SubscribeOrderUpdatesStream>, tonic::Status> {
        info!("Received order updates subscription request");

        let (tx, rx) = tokio::sync::mpsc::channel(100);

        // TODO: Implement actual order updates streaming
        tokio::spawn(async move {
            // Placeholder for order update streaming
            let _ = tx
                .send(Ok(tli::proto::trading::OrderUpdateEvent {
                    order_id: "ORDER_123".to_string(),
                    symbol: "AAPL".to_string(),
                    status: 3, // ORDER_STATUS_FILLED
                    filled_quantity: 100.0,
                    remaining_quantity: 0.0,
                    last_fill_price: 150.25,
                    last_fill_quantity: 100,
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                    message: "Order filled successfully".to_string(),
                }))
                .await;
        });

        Ok(tonic::Response::new(
            tokio_stream::wrappers::ReceiverStream::new(rx),
        ))
    }

    // Risk Management methods (integrated)
    async fn get_va_r(
        &self,
        _request: tonic::Request<tli::proto::trading::GetVaRRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetVaRResponse>, tonic::Status> {
        info!("Received VaR calculation request");

        // TODO: Implement actual VaR calculation
        let response = tli::proto::trading::GetVaRResponse {
            portfolio_var: -10000.0,
            symbol_vars: vec![], // Empty for now - TODO: implement actual symbol VaRs
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
            methodology_used: "Historical Simulation".to_string(),
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_position_risk(
        &self,
        request: tonic::Request<tli::proto::trading::GetPositionRiskRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetPositionRiskResponse>, tonic::Status> {
        let req = request.into_inner();
        info!("Received position risk request for symbol: {:?}", req.symbol);

        // TODO: Implement actual position risk calculation
        let positions = vec![
            tli::proto::trading::PositionRisk {
                symbol: req.symbol.unwrap_or_else(|| "BTCUSD".to_string()),
                position_size: 1.5,
                market_value: 75000.0,
                var_contribution: -5000.0,
                concentration_percent: 25.0,
                risk_level: 2, // RISK_LEVEL_MEDIUM
            }
        ];

        let response = tli::proto::trading::GetPositionRiskResponse {
            positions,
            total_exposure: 75000.0,
            concentration_risk: 25.0,
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    async fn validate_order(
        &self,
        request: tonic::Request<tli::proto::trading::ValidateOrderRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::ValidateOrderResponse>, tonic::Status> {
        let req = request.into_inner();
        info!("Received order validation for symbol: {}", req.symbol);

        // TODO: Implement actual order validation logic
        let response = tli::proto::trading::ValidateOrderResponse {
            approved: true,
            reason: "Order passes all risk checks".to_string(),
            violations: vec![],
            projected_exposure: 75000.0,
            margin_impact: 500.0,
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_risk_metrics(
        &self,
        _request: tonic::Request<tli::proto::trading::GetRiskMetricsRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetRiskMetricsResponse>, tonic::Status> {
        info!("Received risk metrics request");

        // TODO: Implement actual risk metrics calculation
        let response = tli::proto::trading::GetRiskMetricsResponse {
            sharpe_ratio: 1.8,
            max_drawdown: -0.15,
            current_drawdown: -0.05,
            volatility: 0.18,
            beta: 1.2,
            alpha: 0.05,
            value_at_risk: -5000.0,
            expected_shortfall: -7500.0,
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    type SubscribeRiskAlertsStream = tokio_stream::wrappers::ReceiverStream<
        Result<tli::proto::trading::RiskAlertEvent, tonic::Status>,
    >;

    async fn subscribe_risk_alerts(
        &self,
        _request: tonic::Request<tli::proto::trading::SubscribeRiskAlertsRequest>,
    ) -> Result<tonic::Response<Self::SubscribeRiskAlertsStream>, tonic::Status> {
        info!("Received risk alerts subscription request");

        let (tx, rx) = tokio::sync::mpsc::channel(100);

        // TODO: Implement actual risk alerts streaming
        tokio::spawn(async move {
            // Placeholder for risk alert streaming
            let _ = tx
                .send(Ok(tli::proto::trading::RiskAlertEvent {
                    alert_id: "alert_001".to_string(),
                    severity: 2, // RISK_SEVERITY_WARNING
                    symbol: "BTCUSD".to_string(),
                    message: "Portfolio exposure approaching limit".to_string(),
                    threshold_value: 100000.0,
                    current_value: 95000.0,
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                    requires_action: true,
                }))
                .await;
        });

        Ok(tonic::Response::new(
            tokio_stream::wrappers::ReceiverStream::new(rx),
        ))
    }

    async fn emergency_stop(
        &self,
        _request: tonic::Request<tli::proto::trading::EmergencyStopRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::EmergencyStopResponse>, tonic::Status> {
        info!("EMERGENCY STOP activated!");

        // TODO: Implement actual emergency stop logic
        let response = tli::proto::trading::EmergencyStopResponse {
            success: true,
            message: "Emergency stop activated - all trading halted".to_string(),
            orders_cancelled: 5,
            positions_closed: 3,
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    // Monitoring methods (integrated)
    async fn get_metrics(
        &self,
        _request: tonic::Request<tli::proto::trading::GetMetricsRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetMetricsResponse>, tonic::Status> {
        info!("Received metrics request");

        // TODO: Implement actual metrics collection
        let mut metrics = Vec::new();
        metrics.push(tli::proto::trading::Metric {
            name: "cpu_usage".to_string(),
            value: 25.5,
            unit: "percent".to_string(),
            labels: std::collections::HashMap::new(),
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        });
        metrics.push(tli::proto::trading::Metric {
            name: "memory_usage".to_string(),
            value: 512.0,
            unit: "mb".to_string(),
            labels: std::collections::HashMap::new(),
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        });

        let response = tli::proto::trading::GetMetricsResponse {
            metrics,
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_latency(
        &self,
        _request: tonic::Request<tli::proto::trading::GetLatencyRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetLatencyResponse>, tonic::Status> {
        info!("Received latency request");

        // TODO: Implement actual latency measurement
        let response = tli::proto::trading::GetLatencyResponse {
            p50_micros: 50.0,  // 50μs
            p95_micros: 85.0,  // 85μs
            p99_micros: 95.0,  // 95μs
            p999_micros: 98.0, // 98μs
            avg_micros: 55.0,  // 55μs
            max_micros: 100.0, // 100μs
            min_micros: 25.0,  // 25μs
            sample_count: 10000,
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_throughput(
        &self,
        _request: tonic::Request<tli::proto::trading::GetThroughputRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetThroughputResponse>, tonic::Status> {
        info!("Received throughput request");

        // TODO: Implement actual throughput measurement
        let response = tli::proto::trading::GetThroughputResponse {
            requests_per_second: 1000.0,
            bytes_per_second: 1048576.0, // 1MB/s
            total_requests: 50000,
            total_bytes: 1073741824, // 1GB
            error_count: 10,
            error_rate: 0.0002, // 0.02%
        };

        Ok(tonic::Response::new(response))
    }

    type SubscribeMetricsStream = tokio_stream::wrappers::ReceiverStream<
        Result<tli::proto::trading::MetricsEvent, tonic::Status>,
    >;

    async fn subscribe_metrics(
        &self,
        _request: tonic::Request<tli::proto::trading::SubscribeMetricsRequest>,
    ) -> Result<tonic::Response<Self::SubscribeMetricsStream>, tonic::Status> {
        info!("Received metrics subscription request");

        let (tx, rx) = tokio::sync::mpsc::channel(100);

        // TODO: Implement actual metrics streaming
        tokio::spawn(async move {
            let mut interval = tokio::time::interval(tokio::time::Duration::from_secs(5));
            loop {
                interval.tick().await;
                // Create sample metrics
                let mut metrics = Vec::new();
                metrics.push(tli::proto::trading::Metric {
                    name: "cpu_usage".to_string(),
                    value: 25.0 + (random::<f64>() * 10.0),
                    unit: "percent".to_string(),
                    labels: std::collections::HashMap::new(),
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                });
                metrics.push(tli::proto::trading::Metric {
                    name: "memory_usage".to_string(),
                    value: 500.0 + (random::<f64>() * 100.0),
                    unit: "mb".to_string(),
                    labels: std::collections::HashMap::new(),
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                });

                let event = tli::proto::trading::MetricsEvent {
                    metrics,
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                };

                if tx.send(Ok(event)).await.is_err() {
                    break;
                }
            }
        });

        Ok(tonic::Response::new(
            tokio_stream::wrappers::ReceiverStream::new(rx),
        ))
    }

    // Configuration methods (integrated)
    async fn update_parameters(
        &self,
        request: tonic::Request<tli::proto::trading::UpdateParametersRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::UpdateParametersResponse>, tonic::Status> {
        let req = request.into_inner();
        info!(
            "Received parameter update request with {} parameters",
            req.parameters.len()
        );

        // TODO: Implement actual parameter updates
        let mut updated_keys = Vec::new();
        for (key, _value) in &req.parameters {
            updated_keys.push(key.clone());
        }

        let response = tli::proto::trading::UpdateParametersResponse {
            success: true,
            message: "Parameters updated successfully".to_string(),
            updated_keys,
        };

        Ok(tonic::Response::new(response))
    }

    async fn get_config(
        &self,
        _request: tonic::Request<tli::proto::trading::GetConfigRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetConfigResponse>, tonic::Status> {
        info!("Received config request");

        // TODO: Implement actual config retrieval
        let mut config = std::collections::HashMap::new();
        config.insert("max_position_size".to_string(), "100000".to_string());
        config.insert("risk_limit".to_string(), "0.02".to_string());

        let response = tli::proto::trading::GetConfigResponse {
            config,
            version: 1,
            last_updated_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    type SubscribeConfigStream = tokio_stream::wrappers::ReceiverStream<
        Result<tli::proto::trading::ConfigEvent, tonic::Status>,
    >;

    async fn subscribe_config(
        &self,
        _request: tonic::Request<tli::proto::trading::SubscribeConfigRequest>,
    ) -> Result<tonic::Response<Self::SubscribeConfigStream>, tonic::Status> {
        info!("Received config subscription request");

        let (tx, rx) = tokio::sync::mpsc::channel(100);

        // TODO: Implement actual config change streaming
        tokio::spawn(async move {
            // Placeholder for config change streaming
            let _ = tx
                .send(Ok(tli::proto::trading::ConfigEvent {
                    key: "risk_limit".to_string(),
                    value: "0.025".to_string(),
                    old_value: "0.02".to_string(),
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                }))
                .await;
        });

        Ok(tonic::Response::new(
            tokio_stream::wrappers::ReceiverStream::new(rx),
        ))
    }

    // System Status methods (integrated)
    async fn get_system_status(
        &self,
        _request: tonic::Request<tli::proto::trading::GetSystemStatusRequest>,
    ) -> Result<tonic::Response<tli::proto::trading::GetSystemStatusResponse>, tonic::Status> {
        info!("Received system status request");

        // TODO: Implement actual system status collection
        let services = vec![
            tli::proto::trading::ServiceStatus {
                name: "trading_service".to_string(),
                status: 1,
                message: "Operating normally".to_string(),
                last_check_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                details: std::collections::HashMap::new(),
            }
        ];

        let response = tli::proto::trading::GetSystemStatusResponse {
            overall_status: 1,
            services,
            timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
        };

        Ok(tonic::Response::new(response))
    }

    type SubscribeSystemStatusStream = tokio_stream::wrappers::ReceiverStream<
        Result<tli::proto::trading::SystemStatusEvent, tonic::Status>,
    >;

    async fn subscribe_system_status(
        &self,
        _request: tonic::Request<tli::proto::trading::SubscribeSystemStatusRequest>,
    ) -> Result<tonic::Response<Self::SubscribeSystemStatusStream>, tonic::Status> {
        info!("Received system status subscription request");

        let (tx, rx) = tokio::sync::mpsc::channel(100);

        // TODO: Implement actual system status streaming
        tokio::spawn(async move {
            let mut interval = tokio::time::interval(tokio::time::Duration::from_secs(10));
            loop {
                interval.tick().await;
                let event = tli::proto::trading::SystemStatusEvent {
                    service_name: "trading_service".to_string(),
                    status: 1,
                    previous_status: 1,
                    message: "System operating normally".to_string(),
                    timestamp_unix_nanos: chrono::Utc::now().timestamp_nanos_opt().unwrap_or(0),
                };

                if tx.send(Ok(event)).await.is_err() {
                    break;
                }
            }
        });

        Ok(tonic::Response::new(
            tokio_stream::wrappers::ReceiverStream::new(rx),
        ))
    }
}

/// Mock market data service for testing
#[derive(Debug)]
struct MockMarketDataService;

impl risk::MarketDataService for MockMarketDataService {}