//! Interactive Brokers TWS Real Integration Validation Tests
//!
//! These tests validate the REAL Interactive Brokers TWS integration by testing:
//! - TCP connection establishment to TWS/Gateway
//! - FIX protocol message parsing and construction
//! - Order submission and execution workflows
//! - Position tracking and account data retrieval
//! - Connection recovery and error handling
//!
//! NOTE: These tests are designed to gracefully handle connection failures
//! in CI environments while validating real broker integration functionality.
#![allow(unused_crate_dependencies)]

use std::env;
use std::time::Duration;
use std::collections::HashMap;
use tokio::time::timeout;
use tracing::{info, warn, error};

use trading_engine::brokers::interactive_brokers::{InteractiveBrokersClient, IBConfig};
use trading_engine::brokers::config::InteractiveBrokersConfig;
use trading_engine::trading::data_interface::{BrokerInterface, BrokerConnectionStatus};
use trading_engine::prelude::{TradingOrder, Side};
use trading_engine::trading_operations::OrderType;
use common::TimeInForce;

/// Helper function to create test IB configuration
fn create_test_ib_config() -> InteractiveBrokersConfig {
    InteractiveBrokersConfig {
        enabled: true,
        host: env::var("FOXHUNT_IB_HOST").unwrap_or_else(|_| "127.0.0.1".to_string()),
        port: env::var("FOXHUNT_IB_PORT")
            .map(|p| p.parse().unwrap_or(7497))
            .unwrap_or(7497),
        client_id: env::var("FOXHUNT_IB_CLIENT_ID")
            .map(|id| id.parse().unwrap_or(1))
            .unwrap_or(1),
        account_id: env::var("FOXHUNT_IB_ACCOUNT_ID").ok(),
        connection_timeout_secs: 10, // Short timeout for testing
        request_timeout_secs: 5,
        heartbeat_interval_secs: 30,
        max_reconnect_attempts: 2,
        paper_trading: true, // Always use paper trading for tests
    }
}

/// Helper function to create test trading order
fn create_test_order(symbol: &str, side: Side, quantity: i64, price: f64) -> TradingOrder {
    TradingOrder {
        id: OrderId::new(),
        symbol: Symbol::new(symbol.to_string()),
        side,
        quantity: Quantity::from_f64(quantity as f64).unwrap_or_default(),
        price: Price::from_f64(price).unwrap_or_default(),
        order_type: OrderType::Limit,
        time_in_force: TimeInForce::Day,
        timestamp: chrono::Utc::now(),
        metadata: HashMap::new(),
    }
}

#[tokio::test]
async fn test_ib_client_creation() {
    let config = create_test_ib_config();
    let client = InteractiveBrokersClient::new(config);
    
    // Verify initial state
    assert_eq!(client.broker_name(), "InteractiveBrokers_TWS");
    assert_eq!(client.connection_status(), BrokerConnectionStatus::Disconnected);
    assert!(!client.is_connected());
    
    info!("✅ IB client creation test passed");
}

#[tokio::test]
async fn test_ib_connection_attempt() {
    let config = create_test_ib_config();
    let mut client = InteractiveBrokersClient::new(config.clone());
    
    info!("🔄 Attempting connection to IB TWS at {}:{}", config.host, config.port);
    
    // Attempt connection with timeout
    let connection_result = timeout(
        Duration::from_secs(15),
        client.connect()
    ).await;
    
    match connection_result {
        Ok(Ok(())) => {
            info!("✅ Successfully connected to IB TWS!");
            
            // Verify connection status
            assert!(client.is_connected());
            assert_eq!(client.connection_status(), BrokerConnectionStatus::Connected);
            
            // Test heartbeat
            let heartbeat_result = client.send_heartbeat().await;
            match heartbeat_result {
                Ok(()) => info!("✅ Heartbeat successful"),
                Err(e) => warn!("⚠️  Heartbeat failed: {}", e),
            }
            
            // Get account info
            let account_info = client.get_account_info().await;
            match account_info {
                Ok(info) => {
                    info!("✅ Account info retrieved:");
                    for (key, value) in info {
                        info!("   {}: {}", key, value);
                    }
                }
                Err(e) => warn!("⚠️  Failed to get account info: {}", e),
            }
            
            // Clean disconnection
            let disconnect_result = client.disconnect().await;
            match disconnect_result {
                Ok(()) => info!("✅ Disconnected cleanly"),
                Err(e) => warn!("⚠️  Disconnect error: {}", e),
            }
        }
        Ok(Err(e)) => {
            warn!("⚠️  IB connection failed (expected in CI): {}", e);
            info!("   This is normal if TWS/Gateway is not running");
            
            // Verify we're still in disconnected state
            assert!(!client.is_connected());
            assert_eq!(client.connection_status(), BrokerConnectionStatus::Disconnected);
        }
        Err(_) => {
            warn!("⚠️  IB connection timed out (expected in CI)");
            info!("   This is normal if TWS/Gateway is not accessible");
        }
    }
    
    info!("✅ IB connection test completed (graceful handling verified)");
}

#[tokio::test]
async fn test_ib_order_submission_workflow() {
    let config = create_test_ib_config();
    let mut client = InteractiveBrokersClient::new(config);
    
    // Try to connect (may fail in CI)
    let connection_result = timeout(
        Duration::from_secs(10),
        client.connect()
    ).await;
    
    match connection_result {
        Ok(Ok(())) => {
            info!("✅ Connected to IB for order testing");
            
            // Create test orders
            let test_orders = vec![
                create_test_order("AAPL", Side::Buy, 100, 150.50),
                create_test_order("MSFT", Side::Sell, 50, 300.25),
                create_test_order("GOOGL", Side::Buy, 10, 2500.00),
            ];
            
            for (i, order) in test_orders.into_iter().enumerate() {
                info!("🔄 Submitting test order {}: {} {} shares of {}", 
                      i + 1, order.side, order.quantity, order.symbol);
                
                let submit_result = client.submit_order(order).await;
                match submit_result {
                    Ok(broker_order_id) => {
                        info!("✅ Order submitted successfully: {}", broker_order_id);
                        
                        // Wait a moment for order processing
                        tokio::time::sleep(Duration::from_millis(500)).await;
                        
                        // Check order status
                        let status_result = client.get_order_status(&broker_order_id).await;
                        match status_result {
                            Ok(status) => {
                                info!("   Order status: {:?}", status);
                            }
                            Err(e) => {
                                warn!("   Failed to get order status: {}", e);
                            }
                        }
                        
                        // Test order cancellation
                        let cancel_result = client.cancel_order(&broker_order_id).await;
                        match cancel_result {
                            Ok(()) => {
                                info!("✅ Order cancelled successfully");
                            }
                            Err(e) => {
                                warn!("⚠️  Order cancellation failed: {}", e);
                            }
                        }
                    }
                    Err(e) => {
                        warn!("⚠️  Order submission failed: {}", e);
                        info!("   This may be normal if using demo account");
                    }
                }
            }
            
            // Test position retrieval
            let positions_result = client.get_positions().await;
            match positions_result {
                Ok(positions) => {
                    info!("✅ Retrieved {} positions", positions.len());
                    for position in positions {
                        info!("   Position: {} {} shares @ ${}",
                              position.symbol, position.quantity, position.average_price);
                    }
                }
                Err(e) => {
                    warn!("⚠️  Failed to get positions: {}", e);
                }
            }
            
            // Test execution subscription
            let execution_result = client.subscribe_executions().await;
            match execution_result {
                Ok(mut rx) => {
                    info!("✅ Execution subscription established");
                    
                    // Wait briefly for any execution reports
                    let timeout_result = timeout(
                        Duration::from_secs(2),
                        rx.recv()
                    ).await;
                    
                    match timeout_result {
                        Ok(Some(execution)) => {
                            info!("✅ Received execution report: {:?}", execution);
                        }
                        Ok(None) => {
                            info!("   Execution channel closed");
                        }
                        Err(_) => {
                            info!("   No executions received (normal for test)");
                        }
                    }
                }
                Err(e) => {
                    warn!("⚠️  Failed to subscribe to executions: {}", e);
                }
            }
            
            let _ = client.disconnect().await;
        }
        Ok(Err(e)) => {
            warn!("⚠️  Cannot test orders - IB not connected: {}", e);
            info!("   Testing order validation logic instead...");
            
            // Test order validation without connection
            let test_order = create_test_order("AAPL", Side::Buy, 100, 150.50);
            let submit_result = client.submit_order(&test_order).await;
            
            // Should fail with "not connected" error
            match submit_result {
                Ok(_) => {
                    error!("❌ Order unexpectedly succeeded without connection");
                    panic!("Order should fail when not connected");
                }
                Err(e) => {
                    info!("✅ Order properly failed when not connected: {}", e);
                    assert!(e.to_string().to_lowercase().contains("not connected") ||
                           e.to_string().to_lowercase().contains("not available"));
                }
            }
        }
        Err(_) => {
            warn!("⚠️  IB connection timed out - testing offline validation");
            
            // Test that orders fail properly when not connected
            let test_order = create_test_order("AAPL", Side::Buy, 100, 150.50);
            let submit_result = client.submit_order(&test_order).await;
            
            match submit_result {
                Ok(_) => {
                    error!("❌ Order unexpectedly succeeded without connection");
                }
                Err(e) => {
                    info!("✅ Order properly failed when not connected: {}", e);
                }
            }
        }
    }
    
    info!("✅ IB order workflow test completed");
}

#[tokio::test]
async fn test_ib_order_modification() {
    let config = create_test_ib_config();
    let mut client = InteractiveBrokersClient::new(config);
    
    // Try to connect
    let connection_result = timeout(
        Duration::from_secs(10),
        client.connect()
    ).await;
    
    if let Ok(Ok(())) = connection_result {
        info!("✅ Connected to IB for order modification testing");
        
        // Submit an initial order
        let original_order = create_test_order("AAPL", Side::Buy, 100, 150.00);
        
        match client.submit_order(&original_order).await {
            Ok(broker_order_id) => {
                info!("✅ Original order submitted: {}", broker_order_id);
                
                // Wait for order to be processed
                tokio::time::sleep(Duration::from_millis(1000)).await;
                
                // Create modified order (different price and quantity)
                let modified_order = create_test_order("AAPL", Side::Buy, 150, 149.50);
                
                // Test order modification
                let modify_result = client.modify_order(&broker_order_id, &modified_order).await;
                match modify_result {
                    Ok(()) => {
                        info!("✅ Order modification successful");
                        
                        // Verify the modification took effect
                        let status_result = client.get_order_status(&broker_order_id).await;
                        match status_result {
                            Ok(status) => {
                                info!("   Modified order status: {:?}", status);
                            }
                            Err(e) => {
                                warn!("   Failed to get modified order status: {}", e);
                            }
                        }
                    }
                    Err(e) => {
                        warn!("⚠️  Order modification failed: {}", e);
                        info!("   This may be normal depending on order state");
                    }
                }
                
                // Clean up - cancel the order
                let _ = client.cancel_order(&broker_order_id).await;
            }
            Err(e) => {
                warn!("⚠️  Cannot test modification - order submission failed: {}", e);
            }
        }
        
        let _ = client.disconnect().await;
    } else {
        warn!("⚠️  Cannot test modification - IB not connected");
        info!("   Testing modification validation without connection...");
        
        // Test modification without connection
        let test_order = create_test_order("AAPL", Side::Buy, 100, 150.50);
        let modify_result = client.modify_order("fake_order_id", &test_order).await;
        
        match modify_result {
            Ok(()) => {
                error!("❌ Modification unexpectedly succeeded without connection");
            }
            Err(e) => {
                info!("✅ Modification properly failed when not connected: {}", e);
            }
        }
    }
    
    info!("✅ IB order modification test completed");
}

#[tokio::test]
async fn test_ib_reconnection_handling() {
    let config = create_test_ib_config();
    let client = InteractiveBrokersClient::new(config);
    
    info!("🔄 Testing IB reconnection handling");
    
    // Test reconnection without initial connection
    let reconnect_result = client.reconnect().await;
    match reconnect_result {
        Ok(()) => {
            info!("✅ Reconnection succeeded");
            
            // Verify connection state
            assert!(client.is_connected());
            
            // Test reconnection while already connected
            let second_reconnect = client.reconnect().await;
            match second_reconnect {
                Ok(()) => {
                    info!("✅ Second reconnection succeeded");
                }
                Err(e) => {
                    warn!("⚠️  Second reconnection failed: {}", e);
                }
            }
            
            // Test multiple rapid reconnections
            for i in 1..=3 {
                let rapid_reconnect = timeout(
                    Duration::from_secs(5),
                    client.reconnect()
                ).await;
                
                match rapid_reconnect {
                    Ok(Ok(())) => {
                        info!("✅ Rapid reconnection {} succeeded", i);
                    }
                    Ok(Err(e)) => {
                        warn!("⚠️  Rapid reconnection {} failed: {}", i, e);
                    }
                    Err(_) => {
                        warn!("⚠️  Rapid reconnection {} timed out", i);
                    }
                }
                
                // Small delay between attempts
                tokio::time::sleep(Duration::from_millis(100)).await;
            }
        }
        Err(e) => {
            warn!("⚠️  Reconnection failed (expected in CI): {}", e);
            info!("   This is normal if TWS/Gateway is not running");
        }
    }
    
    info!("✅ IB reconnection test completed");
}

#[tokio::test]
async fn test_ib_error_handling() {
    let config = create_test_ib_config();
    let client = InteractiveBrokersClient::new(config);
    
    info!("🔄 Testing IB error handling");
    
    // Test operations without connection
    let test_order = create_test_order("INVALID_SYMBOL", Side::Buy, 0, -1.0);
    
    // Test invalid order submission
    let submit_result = client.submit_order(&test_order).await;
    match submit_result {
        Ok(_) => {
            error!("❌ Invalid order unexpectedly succeeded");
        }
        Err(e) => {
            info!("✅ Invalid order properly rejected: {}", e);
        }
    }
    
    // Test cancellation of non-existent order
    let cancel_result = client.cancel_order("non_existent_order").await;
    match cancel_result {
        Ok(()) => {
            warn!("⚠️  Cancellation of non-existent order unexpectedly succeeded");
        }
        Err(e) => {
            info!("✅ Cancellation of non-existent order properly failed: {}", e);
        }
    }
    
    // Test getting status of non-existent order
    let status_result = client.get_order_status("non_existent_order").await;
    match status_result {
        Ok(status) => {
            warn!("⚠️  Got status for non-existent order: {:?}", status);
        }
        Err(e) => {
            info!("✅ Status check for non-existent order properly failed: {}", e);
        }
    }
    
    // Test operations with invalid configuration
    let mut invalid_config = create_test_ib_config();
    invalid_config.port = 0; // Invalid port
    let invalid_client = InteractiveBrokersClient::new(invalid_config);
    
    let invalid_connect_result = timeout(
        Duration::from_secs(5),
        async move {
            let mut client = invalid_client;
            client.connect().await
        }
    ).await;
    
    match invalid_connect_result {
        Ok(Ok(())) => {
            error!("❌ Connection with invalid config unexpectedly succeeded");
        }
        Ok(Err(e)) => {
            info!("✅ Connection with invalid config properly failed: {}", e);
        }
        Err(_) => {
            info!("✅ Connection with invalid config properly timed out");
        }
    }
    
    info!("✅ IB error handling test completed");
}

#[tokio::test]
async fn test_ib_message_protocol_validation() {
    use core::brokers::brokers::interactive_brokers::{TWSMessageBuilder, TWSMessageParser, TWSMessageType};
    
    info!("🔄 Testing IB TWS message protocol");
    
    // Test message construction
    let heartbeat_msg = TWSMessageBuilder::new(TWSMessageType::Heartbeat)
        .add_field("test_field")
        .add_int(12345)
        .add_double(123.45)
        .add_bool(true)
        .build();
    
    assert!(!heartbeat_msg.is_empty());
    assert!(heartbeat_msg.len() > 4); // Should have length prefix
    info!("✅ Message construction test passed");
    
    // Test order message construction
    let order_msg = TWSMessageBuilder::new(TWSMessageType::PlaceOrder)
        .add_int(1) // Order ID
        .add_field("AAPL") // Symbol
        .add_field("STK") // Security type
        .add_field("BUY") // Side
        .add_double(100.0) // Quantity
        .add_field("LMT") // Order type
        .add_double(150.50) // Price
        .build();
    
    assert!(!order_msg.is_empty());
    info!("✅ Order message construction test passed");
    
    // Test message parsing
    let test_message = "1\x00AAPL\x00100\x00150.0";
    let parse_result = TWSMessageParser::parse_message(test_message.as_bytes());
    
    match parse_result {
        Ok(fields) => {
            assert_eq!(fields.len(), 4);
            assert_eq!(fields[0], "1");
            assert_eq!(fields[1], "AAPL");
            assert_eq!(fields[2], "100");
            assert_eq!(fields[3], "150.0");
            info!("✅ Message parsing test passed");
        }
        Err(e) => {
            error!("❌ Message parsing failed: {}", e);
            panic!("Message parsing should succeed");
        }
    }
    
    // Test message type parsing
    let msg_type = TWSMessageParser::parse_message_type(&["3".to_string()]);
    assert_eq!(msg_type, Some(3));
    info!("✅ Message type parsing test passed");
    
    info!("✅ IB message protocol validation completed");
}

#[tokio::test]
async fn test_ib_performance_characteristics() {
    let config = create_test_ib_config();
    let client = InteractiveBrokersClient::new(config);
    
    info!("🔄 Testing IB performance characteristics");
    
    // Test client creation performance
    let start = std::time::Instant::now();
    let iterations = 100;
    
    for _ in 0..iterations {
        let test_config = create_test_ib_config();
        let _test_client = InteractiveBrokersClient::new(test_config);
    }
    
    let creation_time = start.elapsed();
    let avg_creation_time = creation_time / iterations;
    
    info!("✅ Client creation performance:");
    info!("   {} iterations in {:?}", iterations, creation_time);
    info!("   Average: {:?} per client", avg_creation_time);
    
    // Should be very fast (under 1ms per creation)
    assert!(avg_creation_time < Duration::from_millis(1),
           "Client creation too slow: {:?}", avg_creation_time);
    
    // Test message construction performance
    let msg_start = std::time::Instant::now();
    let msg_iterations = 1000;
    
    for i in 0..msg_iterations {
        let _msg = TWSMessageBuilder::new(TWSMessageType::PlaceOrder)
            .add_int(i)
            .add_field("AAPL")
            .add_field("STK")
            .add_field("BUY")
            .add_double(100.0)
            .add_field("LMT")
            .add_double(150.50)
            .build();
    }
    
    let msg_time = msg_start.elapsed();
    let avg_msg_time = msg_time / msg_iterations;
    
    info!("✅ Message construction performance:");
    info!("   {} iterations in {:?}", msg_iterations, msg_time);
    info!("   Average: {:?} per message", avg_msg_time);
    
    // Should be very fast (under 10μs per message)
    assert!(avg_msg_time < Duration::from_micros(10),
           "Message construction too slow: {:?}", avg_msg_time);
    
    info!("✅ IB performance characteristics test completed");
}

/// Integration test helper for IB configuration validation
#[tokio::test]
async fn test_ib_configuration_validation() {
    info!("🔄 Testing IB configuration validation");
    
    // Test valid configuration
    let valid_config = create_test_ib_config();
    let client = InteractiveBrokersClient::new(valid_config);
    assert_eq!(client.broker_name(), "InteractiveBrokersClient");
    
    // Test configuration with different parameters
    let test_configs = vec![
        // Different hosts
        ("localhost", 7497),
        ("127.0.0.1", 7497),
        ("demo.interactivebrokers.com", 4001),
        
        // Different ports
        ("127.0.0.1", 7496), // TWS Live
        ("127.0.0.1", 7497), // TWS Paper
        ("127.0.0.1", 4001), // Gateway Live
        ("127.0.0.1", 4002), // Gateway Paper
    ];
    
    for (host, port) in test_configs {
        let mut config = create_test_ib_config();
        config.host = host.to_string();
        config.port = port;
        
        let test_client = InteractiveBrokersClient::new(config);
        assert_eq!(test_client.broker_name(), "InteractiveBrokersClient");
        info!("✅ Configuration valid for {}:{}", host, port);
    }
    
    info!("✅ IB configuration validation completed");
}