//! Complete TLI Client Example
//!
//! This example demonstrates how to use the TLI client infrastructure
//! to connect to both Trading Service and Backtesting Service.

use tli::prelude::*;
use tokio::time::{sleep, Duration};
use tracing::{error, info, warn};

#[tokio::main]
async fn main() -> TliResult<()> {
    // Initialize logging
    tracing_subscriber::fmt::init();

    info!("Starting TLI Complete Client Example");

    // Create client suite with both services
    let mut client_suite = TliClientBuilder::new()
        .with_service_endpoint(
            "trading_service".to_string(),
            "http://localhost:50051".to_string(),
        )
        .with_service_endpoint(
            "backtesting_service".to_string(),
            "http://localhost:50052".to_string(),
        )
        .with_trading_config(TradingClientConfig {
            service_name: "trading_service".to_string(),
            request_timeout: Duration::from_secs(10),
            order_validation: OrderValidationConfig {
                enable_pre_validation: true,
                max_order_size: 100_000.0,
                min_order_size: 1.0,
                validate_symbols: true,
                validate_market_hours: true,
            },
            risk_management: RiskManagementConfig {
                enable_risk_monitoring: true,
                max_position_exposure: 500_000.0,
                var_confidence_level: 0.95,
                alert_thresholds: RiskAlertThresholds::default(),
                enable_position_limits: true,
            },
            market_data: MarketDataConfig {
                enable_real_time: true,
                default_symbols: vec!["SPY".to_string(), "QQQ".to_string(), "AAPL".to_string()],
                data_types: vec![
                    MarketDataType::Quotes,
                    MarketDataType::Trades,
                    MarketDataType::Bars,
                ],
                buffer_size: 10000,
                enable_tick_data: false,
            },
            monitoring: MonitoringConfig {
                enable_monitoring: true,
                metrics_interval: Duration::from_secs(5),
                enable_latency_tracking: true,
                enable_throughput_tracking: true,
            },
            event_streaming: EventStreamConfig {
                event_types: vec![
                    EventType::MarketData,
                    EventType::OrderUpdates,
                    EventType::RiskAlerts,
                    EventType::Metrics,
                    EventType::Config,
                    EventType::SystemStatus,
                ],
                buffer_size: 1000,
                reconnect_config: ReconnectConfig::default(),
                filters: EventFilters::default(),
            },
        })
        .with_backtesting_config(BacktestingClientConfig::default())
        .build()
        .await?;

    info!("Client suite created successfully");

    // Demonstrate trading operations
    if let Some(trading_client) = &client_suite.trading_client {
        info!("Connecting to trading service...");
        // Note: We need to connect first in a real implementation
        // trading_client.connect().await?;

        // 1. Get account information
        info!("Getting account information...");
        let account_request = GetAccountInfoRequest {
            account_id: "demo_account".to_string(),
        };

        match trading_client.get_account_info(account_request).await {
            Ok(response) => {
                info!(
                    "Account Info: ID={}, Total Value=${:.2}, Cash=${:.2}, Buying Power=${:.2}",
                    response.account_id,
                    response.total_value,
                    response.cash_balance,
                    response.buying_power
                );
            }
            Err(e) => warn!("Failed to get account info: {}", e),
        }

        // 2. Get current positions
        info!("Getting current positions...");
        let positions_request = GetPositionsRequest { symbol: None };

        match trading_client.get_positions(positions_request).await {
            Ok(response) => {
                info!("Current positions: {} total", response.positions.len());
                for position in response.positions {
                    info!(
                        "  {}: {} shares @ ${:.2} (Value: ${:.2}, P&L: ${:.2})",
                        position.symbol,
                        position.quantity,
                        position.market_price,
                        position.market_value,
                        position.unrealized_pnl
                    );
                }
            }
            Err(e) => warn!("Failed to get positions: {}", e),
        }

        // 3. Submit a test order
        info!("Submitting test order...");
        let order_request = SubmitOrderRequest {
            symbol: "SPY".to_string(),
            side: OrderSide::Buy.into(),
            order_type: OrderType::Limit.into(),
            quantity: 10.0,
            price: Some(450.0),
            stop_price: None,
            time_in_force: "DAY".to_string(),
            client_order_id: "test_order_001".to_string(),
        };

        match trading_client.submit_order(order_request).await {
            Ok(response) => {
                if response.success {
                    info!("Order submitted successfully: {}", response.order_id);
                } else {
                    warn!("Order submission failed: {}", response.message);
                }
            }
            Err(e) => warn!("Failed to submit order: {}", e),
        }

        // 4. Get risk metrics
        info!("Getting risk metrics...");
        let risk_request = GetRiskMetricsRequest {
            portfolio_id: Some("default".to_string()),
            start_time_unix_nanos: None,
            end_time_unix_nanos: None,
        };

        match trading_client.get_risk_metrics(risk_request).await {
            Ok(response) => {
                info!(
                    "Risk Metrics: Sharpe={:.2}, Max Drawdown={:.2}%, VaR=${:.2}",
                    response.sharpe_ratio,
                    response.max_drawdown * 100.0,
                    response.value_at_risk
                );
            }
            Err(e) => warn!("Failed to get risk metrics: {}", e),
        }

        // 5. Get system status
        info!("Getting system status...");
        let status_request = GetSystemStatusRequest {
            service_names: vec![], // Empty for all services
        };

        match trading_client.get_system_status(status_request).await {
            Ok(response) => {
                info!(
                    "System Status: {:?} ({} services)",
                    response.overall_status,
                    response.services.len()
                );
                for service in response.services {
                    info!(
                        "  {}: {:?} - {}",
                        service.name, service.status, service.message
                    );
                }
            }
            Err(e) => warn!("Failed to get system status: {}", e),
        }

        // 6. Subscribe to market data
        info!("Subscribing to market data...");
        let market_data_request = SubscribeMarketDataRequest {
            symbols: vec!["SPY".to_string(), "QQQ".to_string()],
            data_types: vec![MarketDataType::Quotes.into(), MarketDataType::Trades.into()],
        };

        match trading_client
            .subscribe_market_data(market_data_request)
            .await
        {
            Ok(_) => info!("Successfully subscribed to market data"),
            Err(e) => warn!("Failed to subscribe to market data: {}", e),
        }

        // 7. Get event receiver and process some events
        if let Some(mut event_receiver) = trading_client.get_event_receiver().await {
            info!("Processing events for 10 seconds...");
            let start = tokio::time::Instant::now();
            let mut event_count = 0;

            while start.elapsed() < Duration::from_secs(10) && event_count < 100 {
                tokio::select! {
                    result = event_receiver.recv() => {
                        match result {
                            Ok(event) => {
                                event_count += 1;
                                match event {
                                    TliEvent::MarketData { event, timestamp, source } => {
                                        info!("Market Data event from {}: {:?}", source, event);
                                    }
                                    TliEvent::OrderUpdate { event, timestamp, source } => {
                                        info!("Order Update from {}: Order {} - {:?}",
                                              source, event.order_id, event.status);
                                    }
                                    TliEvent::RiskAlert { event, timestamp, source } => {
                                        warn!("Risk Alert from {}: {:?} - {}",
                                              source, event.severity, event.message);
                                    }
                                    TliEvent::Metrics { event, timestamp, source } => {
                                        info!("Metrics from {}: {} metrics", source, event.metrics.len());
                                    }
                                    TliEvent::Config { event, timestamp, source } => {
                                        info!("Config change from {}: {} = {}",
                                              source, event.key, event.value);
                                    }
                                    TliEvent::SystemStatus { event, timestamp, source } => {
                                        info!("System status change from {}: {} -> {:?}",
                                              source, event.service_name, event.status);
                                    }
                                    TliEvent::ConnectionStatus { service, connected, timestamp } => {
                                        if connected {
                                            info!("Service {} connected", service);
                                        } else {
                                            warn!("Service {} disconnected", service);
                                        }
                                    }
                                    TliEvent::StreamError { event_type, error, timestamp, retryable } => {
                                        error!("Stream error for {}: {} (retryable: {})",
                                               event_type, error, retryable);
                                    }
                                    _ => {}
                                }
                            }
                            Err(e) => {
                                warn!("Error receiving event: {}", e);
                                break;
                            }
                        }
                    }
                    _ = sleep(Duration::from_millis(100)) => {
                        // Continue loop
                    }
                }
            }

            info!("Processed {} events", event_count);
        }

        // 8. Get client statistics
        let stats = trading_client.get_stats().await;
        info!(
            "Trading Client Stats: {} API calls, {} errors, avg latency: {:?}",
            stats.api_calls, stats.api_errors, stats.avg_order_latency
        );
    }

    // Demonstrate backtesting operations
    if let Some(backtesting_client) = &client_suite.backtesting_client {
        info!("Connecting to backtesting service...");
        // Note: We need to connect first in a real implementation
        // backtesting_client.connect().await?;

        // 1. Start a backtest
        info!("Starting a new backtest...");
        let backtest_request = StartBacktestRequest {
            strategy_name: "mean_reversion_v1".to_string(),
            symbols: vec!["SPY".to_string(), "QQQ".to_string()],
            start_date_unix_nanos: 1640995200000000000, // 2022-01-01
            end_date_unix_nanos: 1672531200000000000,   // 2023-01-01
            initial_capital: 100_000.0,
            parameters: std::collections::HashMap::from([
                ("lookback_period".to_string(), "20".to_string()),
                ("threshold".to_string(), "2.0".to_string()),
            ]),
            save_results: true,
            description: "Testing mean reversion strategy on SPY and QQQ".to_string(),
        };

        match backtesting_client.start_backtest(backtest_request).await {
            Ok(response) => {
                if response.success {
                    info!(
                        "Backtest started: {} (estimated duration: {}s)",
                        response.backtest_id, response.estimated_duration_seconds
                    );

                    // 2. Monitor backtest progress
                    let backtest_id = response.backtest_id.clone();
                    for i in 0..10 {
                        sleep(Duration::from_secs(2)).await;

                        let status_request = GetBacktestStatusRequest {
                            backtest_id: backtest_id.clone(),
                        };

                        match backtesting_client.get_backtest_status(status_request).await {
                            Ok(status) => {
                                info!(
                                    "Backtest {} progress: {:.1}% - {} trades, P&L: ${:.2}",
                                    backtest_id,
                                    status.progress_percentage,
                                    status.trades_executed,
                                    status.current_pnl
                                );

                                if status.status == BacktestStatus::Completed.into() {
                                    info!("Backtest completed!");
                                    break;
                                } else if status.status == BacktestStatus::Failed.into() {
                                    error!(
                                        "Backtest failed: {}",
                                        status.error_message.unwrap_or_default()
                                    );
                                    break;
                                }
                            }
                            Err(e) => warn!("Failed to get backtest status: {}", e),
                        }
                    }

                    // 3. Get backtest results
                    info!("Getting backtest results...");
                    let results_request = GetBacktestResultsRequest {
                        backtest_id: backtest_id.clone(),
                        include_trades: true,
                        include_metrics: true,
                    };

                    match backtesting_client
                        .get_backtest_results(results_request)
                        .await
                    {
                        Ok(results) => {
                            if let Some(metrics) = &results.metrics {
                                info!("Backtest Results:");
                                info!("  Total Return: {:.2}%", metrics.total_return * 100.0);
                                info!(
                                    "  Annualized Return: {:.2}%",
                                    metrics.annualized_return * 100.0
                                );
                                info!("  Sharpe Ratio: {:.2}", metrics.sharpe_ratio);
                                info!("  Max Drawdown: {:.2}%", metrics.max_drawdown * 100.0);
                                info!("  Win Rate: {:.1}%", metrics.win_rate * 100.0);
                                info!("  Total Trades: {}", metrics.total_trades);
                                info!("  Profit Factor: {:.2}", metrics.profit_factor);
                            }

                            info!("Trade count: {}", results.trades.len());
                            info!("Equity curve points: {}", results.equity_curve.len());
                        }
                        Err(e) => warn!("Failed to get backtest results: {}", e),
                    }
                } else {
                    warn!("Failed to start backtest: {}", response.message);
                }
            }
            Err(e) => warn!("Failed to start backtest: {}", e),
        }

        // 4. List historical backtests
        info!("Listing historical backtests...");
        let list_request = ListBacktestsRequest {
            limit: 10,
            offset: 0,
            strategy_name: None,
            status_filter: None,
        };

        match backtesting_client.list_backtests(list_request).await {
            Ok(response) => {
                info!(
                    "Found {} backtests (total: {})",
                    response.backtests.len(),
                    response.total_count
                );
                for backtest in response.backtests {
                    info!(
                        "  {}: {} - Return: {:.2}%, Sharpe: {:.2}, MaxDD: {:.2}%",
                        backtest.backtest_id,
                        backtest.strategy_name,
                        backtest.total_return * 100.0,
                        backtest.sharpe_ratio,
                        backtest.max_drawdown * 100.0
                    );
                }
            }
            Err(e) => warn!("Failed to list backtests: {}", e),
        }
    }

    // Get connection statistics
    info!("Getting connection statistics...");
    let connection_stats = client_suite.get_connection_stats().await;
    for (service, stats_list) in connection_stats {
        info!("Service {}: {} connections", service, stats_list.len());
        for stats in stats_list {
            info!(
                "  Connection: {} requests, {} errors, latency: {:?}",
                stats.requests_sent, stats.errors, stats.average_latency
            );
        }
    }

    // Shutdown
    info!("Shutting down client suite...");
    client_suite.shutdown().await;

    info!("TLI Complete Client Example finished");
    Ok(())
}