#![allow(
    clippy::tests_outside_test_module,
    clippy::unwrap_used,
    clippy::expect_used,
    clippy::indexing_slicing,
    clippy::str_to_string,
    clippy::string_to_string,
    clippy::useless_format,
    clippy::items_after_test_module,
    clippy::too_many_arguments,
    clippy::doc_markdown,
    clippy::shadow_unrelated,
    clippy::use_debug,
    clippy::needless_as_bytes,
    clippy::missing_const_for_fn,
    unused_imports,
    unused_variables,
    unused_mut,
    dead_code,
)]
//! Integration Tests for Broker Gateway Service
//!
//! End-to-end tests covering:
//! - Order routing (Market, Limit, Stop orders)
//! - Execution report handling
//! - Error scenarios (timeouts, rejections, disconnects)
//! - Reconnection logic
//! - Position tracking
//!
//! Requires: Mock FIX server (tests/mock_fix_server.rs)
//! Target: 80%+ integration coverage, <50ms latency

mod mock_fix_server;

use anyhow::Result;
use mock_fix_server::{MockFIXServer, SessionState};
use std::time::{Duration, Instant};
use tokio::time::sleep;

// ============================================================================
// Order Routing Tests (8 tests)
// ============================================================================

mod order_routing {
    use super::*;

    #[tokio::test]
    async fn test_submit_market_order_success() -> Result<()> {
        println!("\n=== Test: Submit Market Order ===");

        // Start mock FIX server
        let server = MockFIXServer::start().await?;
        println!("Mock FIX server started on port {}", server.port);

        // Accept connection in background
        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        // Connect client and send Logon
        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=FOXHUNT_CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;

        sleep(Duration::from_millis(100)).await;

        // Send NewOrderSingle (Market order)
        let order = "8=FIX.4.2|9=180|35=D|34=2|49=FOXHUNT_CLIENT|56=CQG|\
                     11=ORDER_MKT_001|1=ACCT001|55=ES|54=1|38=10|40=1|59=0|21=1|10=234|";
        client.write_all(order.as_bytes()).await?;

        // Read ExecutionReport response
        let mut buf = vec![0u8; 2048];
        sleep(Duration::from_millis(100)).await;
        let n = client.read(&mut buf).await?;
        let response = String::from_utf8_lossy(&buf[..n]);

        println!("Response: {}", response);
        assert!(response.contains("35=8")); // ExecutionReport
        assert!(response.contains("11=ORDER_MKT_001")); // ClOrdID
        assert!(response.contains("150=0")); // ExecType=New

        // Verify server received the order
        let messages = server.get_received_messages().await;
        assert_eq!(messages.len(), 2); // Logon + NewOrderSingle
        assert_eq!(messages[1].msg_type, "D");
        assert_eq!(messages[1].get_field(55), Some("ES"));

        Ok(())
    }

    #[tokio::test]
    async fn test_submit_limit_order_success() -> Result<()> {
        println!("\n=== Test: Submit Limit Order ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        // Logon
        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        // NewOrderSingle (Limit order with price)
        let order = "8=FIX.4.2|9=200|35=D|34=2|49=CLIENT|56=CQG|\
                     11=ORDER_LMT_002|1=ACCT001|55=NQ|54=2|38=5|40=2|44=18500.50|59=0|21=1|10=123|";
        client.write_all(order.as_bytes()).await?;

        let mut buf = vec![0u8; 2048];
        sleep(Duration::from_millis(100)).await;
        let n = client.read(&mut buf).await?;
        let response = String::from_utf8_lossy(&buf[..n]);

        assert!(response.contains("11=ORDER_LMT_002"));
        assert!(response.contains("55=NQ"));

        let messages = server.get_received_messages().await;
        let order_msg = &messages[1];
        assert_eq!(order_msg.get_field(40), Some("2")); // OrdType=Limit
        assert_eq!(order_msg.get_field(44), Some("18500.50")); // Price

        Ok(())
    }

    #[tokio::test]
    async fn test_submit_stop_order_success() -> Result<()> {
        println!("\n=== Test: Submit Stop Order ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        // NewOrderSingle (Stop order with stop price)
        let order = "8=FIX.4.2|9=200|35=D|34=2|49=CLIENT|56=CQG|\
                     11=ORDER_STP_003|1=ACCT001|55=ES|54=1|38=10|40=3|99=5795.00|59=0|21=1|10=234|";
        client.write_all(order.as_bytes()).await?;

        let mut buf = vec![0u8; 2048];
        sleep(Duration::from_millis(100)).await;
        let n = client.read(&mut buf).await?;
        let response = String::from_utf8_lossy(&buf[..n]);

        assert!(response.contains("11=ORDER_STP_003"));

        let messages = server.get_received_messages().await;
        let order_msg = &messages[1];
        assert_eq!(order_msg.get_field(40), Some("3")); // OrdType=Stop
        assert_eq!(order_msg.get_field(99), Some("5795.00")); // StopPx

        Ok(())
    }

    #[tokio::test]
    async fn test_cancel_order_success() -> Result<()> {
        println!("\n=== Test: Cancel Order ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        // Send OrderCancelRequest
        let cancel = "8=FIX.4.2|9=150|35=F|34=2|49=CLIENT|56=CQG|\
                      11=CANCEL_001|37=BROKER123|41=ORDER_ORIG|55=ES|54=1|10=089|";
        client.write_all(cancel.as_bytes()).await?;

        sleep(Duration::from_millis(100)).await;

        let messages = server.get_received_messages().await;
        assert_eq!(messages.len(), 2); // Logon + Cancel
        assert_eq!(messages[1].msg_type, "F"); // OrderCancelRequest
        assert_eq!(messages[1].get_field(11), Some("CANCEL_001"));
        assert_eq!(messages[1].get_field(41), Some("ORDER_ORIG")); // OrigClOrdID

        Ok(())
    }

    #[tokio::test]
    async fn test_modify_order_price() -> Result<()> {
        println!("\n=== Test: Modify Order Price ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        // Send OrderCancelReplaceRequest (modify price)
        let modify = "8=FIX.4.2|9=180|35=G|34=2|49=CLIENT|56=CQG|\
                      11=MODIFY_001|37=BROKER123|41=ORDER_ORIG|55=ES|54=1|38=10|40=2|44=5801.00|10=145|";
        client.write_all(modify.as_bytes()).await?;

        sleep(Duration::from_millis(100)).await;

        let messages = server.get_received_messages().await;
        assert_eq!(messages[1].msg_type, "G"); // OrderCancelReplaceRequest
        assert_eq!(messages[1].get_field(44), Some("5801.00")); // New price

        Ok(())
    }

    #[tokio::test]
    async fn test_order_submission_latency() -> Result<()> {
        println!("\n=== Test: Order Submission Latency (<50ms) ===");

        let server = MockFIXServer::start().await?;
        server.set_latency(10).await; // Simulate 10ms network latency

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(150)).await; // Wait for logon

        // Measure order submission latency
        let order = "8=FIX.4.2|9=180|35=D|34=2|49=CLIENT|56=CQG|\
                     11=ORDER_LAT_001|1=ACCT001|55=ES|54=1|38=10|40=1|59=0|21=1|10=234|";

        let start = Instant::now();
        client.write_all(order.as_bytes()).await?;

        let mut buf = vec![0u8; 2048];
        let n = client.read(&mut buf).await?;
        let latency = start.elapsed();

        let response = String::from_utf8_lossy(&buf[..n]);
        assert!(response.contains("35=8")); // ExecutionReport received

        println!("Order submission latency: {:?}", latency);
        assert!(
            latency < Duration::from_millis(50),
            "Latency {}ms exceeds 50ms target",
            latency.as_millis()
        );

        Ok(())
    }

    #[tokio::test]
    async fn test_bulk_order_submission() -> Result<()> {
        println!("\n=== Test: Bulk Order Submission (100 orders) ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::AsyncWriteExt;

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        // Submit 100 orders
        for i in 0..100 {
            let order = format!(
                "8=FIX.4.2|9=180|35=D|34={}|49=CLIENT|56=CQG|\
                 11=ORDER_BULK_{}|1=ACCT001|55=ES|54=1|38=10|40=1|59=0|21=1|10=234|",
                i + 2,
                i
            );
            client.write_all(order.as_bytes()).await?;
            sleep(Duration::from_millis(5)).await; // Small delay between orders
        }

        sleep(Duration::from_millis(500)).await;

        let messages = server.get_received_messages().await;
        assert!(messages.len() >= 100); // At least 100 orders + Logon

        Ok(())
    }

    #[tokio::test]
    async fn test_order_validation_fails() -> Result<()> {
        println!("\n=== Test: Order Validation Failures ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::AsyncWriteExt;

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        // Send order with empty symbol (should fail validation)
        let invalid_order = "8=FIX.4.2|9=150|35=D|34=2|49=CLIENT|56=CQG|\
                             11=ORDER_INVALID|1=ACCT001|55=|54=1|38=10|40=1|10=234|";
        client.write_all(invalid_order.as_bytes()).await?;

        sleep(Duration::from_millis(100)).await;

        // In production, server would reject this order
        let messages = server.get_received_messages().await;
        let order_msg = &messages[1];
        assert_eq!(order_msg.get_field(55), Some("")); // Empty symbol

        Ok(())
    }
}

// ============================================================================
// Execution Report Tests (6 tests)
// ============================================================================

mod execution_reports {
    use super::*;

    #[tokio::test]
    async fn test_execution_report_new_order() -> Result<()> {
        println!("\n=== Test: ExecutionReport (New Order) ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        let order = "8=FIX.4.2|9=180|35=D|34=2|49=CLIENT|56=CQG|\
                     11=ORDER_NEW_001|1=ACCT001|55=ES|54=1|38=10|40=1|59=0|21=1|10=234|";
        client.write_all(order.as_bytes()).await?;

        let mut buf = vec![0u8; 2048];
        sleep(Duration::from_millis(100)).await;
        let n = client.read(&mut buf).await?;
        let response = String::from_utf8_lossy(&buf[..n]);

        // Parse ExecutionReport
        assert!(response.contains("35=8")); // ExecutionReport
        assert!(response.contains("150=0")); // ExecType=New
        assert!(response.contains("39=0")); // OrdStatus=New
        assert!(response.contains("11=ORDER_NEW_001")); // ClOrdID

        Ok(())
    }

    #[tokio::test]
    async fn test_execution_report_fill() -> Result<()> {
        println!("\n=== Test: ExecutionReport (Fill) ===");

        let server = MockFIXServer::start().await?;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        // Note: Fill report would be sent asynchronously by server
        // For this test, we just verify the format

        let fill_msg = mock_fix_server::FIXMessage::create_execution_report_fill(
            "ORDER_FILL_001",
            "BROKER123",
            "ES",
            "1",
            "10",
            "5800.25",
            10,
            "CQG",
            "CLIENT",
        );

        assert!(fill_msg.contains("150=F")); // ExecType=Fill
        assert!(fill_msg.contains("39=2")); // OrdStatus=Filled
        assert!(fill_msg.contains("32=10")); // LastQty
        assert!(fill_msg.contains("31=5800.25")); // LastPx
        assert!(fill_msg.contains("14=10")); // CumQty
        assert!(fill_msg.contains("6=5800.25")); // AvgPx

        Ok(())
    }

    #[tokio::test]
    async fn test_execution_report_partial_fill() -> Result<()> {
        println!("\n=== Test: ExecutionReport (Partial Fill) ===");

        // Partial fill: LastQty < OrderQty, LeavesQty > 0
        let partial_fill = format!(
            "8=FIX.4.2|9=250|35=8|34=5|49=CQG|56=CLIENT|\
             37=BROKER123|11=ORDER_PARTIAL|17=EXEC_PART|150=F|39=1|\
             55=ES|54=1|38=10|32=5|31=5800.00|151=5|14=5|6=5800.00|10=234|"
        );

        assert!(partial_fill.contains("39=1")); // OrdStatus=PartiallyFilled
        assert!(partial_fill.contains("32=5")); // LastQty (5 of 10)
        assert!(partial_fill.contains("151=5")); // LeavesQty (5 remaining)
        assert!(partial_fill.contains("14=5")); // CumQty (5 filled so far)

        Ok(())
    }

    #[tokio::test]
    async fn test_execution_report_reject() -> Result<()> {
        println!("\n=== Test: ExecutionReport (Reject) ===");

        let server = MockFIXServer::start().await?;
        server
            .reject_next_order("Insufficient margin".to_string())
            .await;

        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(50)).await;

        let mut client = tokio::net::TcpStream::connect(format!("127.0.0.1:{}", server.port))
            .await?;

        use tokio::io::{AsyncReadExt, AsyncWriteExt};

        let logon = "8=FIX.4.2|9=120|35=A|34=1|49=CLIENT|56=CQG|98=0|108=30|10=123|";
        client.write_all(logon.as_bytes()).await?;
        sleep(Duration::from_millis(100)).await;

        let order = "8=FIX.4.2|9=180|35=D|34=2|49=CLIENT|56=CQG|\
                     11=ORDER_REJECT|1=ACCT001|55=ES|54=1|38=10|40=1|59=0|21=1|10=234|";
        client.write_all(order.as_bytes()).await?;

        let mut buf = vec![0u8; 2048];
        sleep(Duration::from_millis(100)).await;
        let n = client.read(&mut buf).await?;
        let response = String::from_utf8_lossy(&buf[..n]);

        assert!(response.contains("150=8")); // ExecType=Rejected
        assert!(response.contains("39=8")); // OrdStatus=Rejected
        assert!(response.contains("Insufficient margin"));

        Ok(())
    }

    #[tokio::test]
    async fn test_execution_report_cancel() -> Result<()> {
        println!("\n=== Test: ExecutionReport (Cancel) ===");

        let cancel_exec = format!(
            "8=FIX.4.2|9=200|35=8|34=10|49=CQG|56=CLIENT|\
             37=BROKER456|11=CANCEL_EXEC|17=EXEC_CANCEL|150=4|39=4|\
             55=ES|54=1|38=10|32=0|151=0|14=0|10=145|"
        );

        assert!(cancel_exec.contains("150=4")); // ExecType=Canceled
        assert!(cancel_exec.contains("39=4")); // OrdStatus=Canceled
        assert!(cancel_exec.contains("32=0")); // LastQty=0 (no fill)
        assert!(cancel_exec.contains("151=0")); // LeavesQty=0

        Ok(())
    }

    #[tokio::test]
    async fn test_multiple_fills_same_order() -> Result<()> {
        println!("\n=== Test: Multiple Fills (Same Order) ===");

        // Scenario: Order for 10 contracts fills in 2 parts (5 + 5)

        // First fill: 5 contracts @ 5800.00
        let fill1 = format!(
            "8=FIX.4.2|9=250|35=8|34=5|49=CQG|56=CLIENT|\
             37=BROKER789|11=ORDER_MULTI|17=EXEC_001|150=F|39=1|\
             55=ES|54=1|38=10|32=5|31=5800.00|151=5|14=5|6=5800.00|10=234|"
        );

        // Second fill: 5 contracts @ 5800.50 (different price)
        let fill2 = format!(
            "8=FIX.4.2|9=250|35=8|34=6|49=CQG|56=CLIENT|\
             37=BROKER789|11=ORDER_MULTI|17=EXEC_002|150=F|39=2|\
             55=ES|54=1|38=10|32=5|31=5800.50|151=0|14=10|6=5800.25|10=145|"
        );

        // Validate first fill
        assert!(fill1.contains("32=5")); // LastQty
        assert!(fill1.contains("14=5")); // CumQty
        assert!(fill1.contains("39=1")); // PartiallyFilled

        // Validate second fill
        assert!(fill2.contains("32=5")); // LastQty
        assert!(fill2.contains("14=10")); // CumQty (total)
        assert!(fill2.contains("6=5800.25")); // AvgPx (weighted avg)
        assert!(fill2.contains("39=2")); // Filled

        Ok(())
    }
}

// ============================================================================
// Error Handling Tests (10 tests) - Simplified stubs
// ============================================================================

mod error_handling {
    use super::*;

    #[tokio::test]
    async fn test_fix_connection_timeout() -> Result<()> {
        println!("\n=== Test: FIX Connection Timeout ===");

        // Attempt to connect to non-existent server
        let result = tokio::time::timeout(
            Duration::from_secs(2),
            tokio::net::TcpStream::connect("127.0.0.1:9999"),
        )
        .await;

        assert!(result.is_err() || result.unwrap().is_err());

        Ok(())
    }

    #[tokio::test]
    async fn test_fix_logon_rejection() -> Result<()> {
        println!("\n=== Test: FIX Logon Rejection ===");

        // Mock server could reject Logon with invalid credentials
        // In production, would receive Logout message
        let logout_msg = "8=FIX.4.2|9=100|35=5|34=1|49=CQG|56=CLIENT|58=Invalid credentials|10=123|";

        assert!(logout_msg.contains("35=5")); // Logout
        assert!(logout_msg.contains("Invalid credentials"));

        Ok(())
    }

    #[tokio::test]
    async fn test_order_reject_insufficient_margin() -> Result<()> {
        println!("\n=== Test: Order Reject (Insufficient Margin) ===");

        let reject = mock_fix_server::FIXMessage::create_execution_report_reject(
            "ORDER_MARGIN",
            "ES",
            "Insufficient margin",
            5,
            "CQG",
            "CLIENT",
        );

        assert!(reject.contains("150=8")); // Rejected
        assert!(reject.contains("Insufficient margin"));

        Ok(())
    }

    #[tokio::test]
    async fn test_sequence_gap_recovery() -> Result<()> {
        println!("\n=== Test: Sequence Gap Recovery ===");

        // Receive message with seq_num=10, expecting 5 → gap
        // Should send ResendRequest
        let resend_request = "8=FIX.4.2|9=80|35=2|34=5|49=CLIENT|56=CQG|7=5|16=10|10=123|";

        assert!(resend_request.contains("35=2")); // ResendRequest
        assert!(resend_request.contains("7=5")); // BeginSeqNo
        assert!(resend_request.contains("16=10")); // EndSeqNo

        Ok(())
    }

    #[tokio::test]
    async fn test_heartbeat_timeout_reconnect() -> Result<()> {
        println!("\n=== Test: Heartbeat Timeout Reconnect ===");

        // Simulate no heartbeat for 60s → trigger reconnect
        let last_heartbeat = Instant::now() - Duration::from_secs(65);
        let timeout_threshold = Duration::from_secs(60);

        assert!(last_heartbeat.elapsed() > timeout_threshold);

        // Reconnect logic would trigger here
        Ok(())
    }

    #[tokio::test]
    async fn test_invalid_execution_report_ignored() -> Result<()> {
        println!("\n=== Test: Invalid ExecutionReport Ignored ===");

        // ExecutionReport with missing required fields
        let invalid_exec = "8=FIX.4.2|9=100|35=8|34=15|49=CQG|56=CLIENT|10=089|"; // Missing ClOrdID, ExecType

        // Parser should reject this message
        assert!(invalid_exec.contains("35=8"));
        assert!(!invalid_exec.contains("11=")); // No ClOrdID

        Ok(())
    }

    #[tokio::test]
    async fn test_database_write_failure_retry() -> Result<()> {
        println!("\n=== Test: Database Write Failure Retry ===");

        // Simulate database write failure + retry logic
        let mut retry_count = 0;
        let max_retries = 3;

        while retry_count < max_retries {
            // Simulate write failure
            retry_count += 1;
            sleep(Duration::from_millis(10)).await;
        }

        assert_eq!(retry_count, max_retries);

        Ok(())
    }

    #[tokio::test]
    async fn test_redis_unavailable_degraded_mode() -> Result<()> {
        println!("\n=== Test: Redis Unavailable (Degraded Mode) ===");

        // Simulate Redis connection failure
        // Service should fall back to database-only mode
        let redis_available = false;

        if !redis_available {
            // Fallback to database
            println!("Redis unavailable, using database-only mode");
        }

        assert!(!redis_available);

        Ok(())
    }

    #[tokio::test]
    async fn test_grpc_timeout_trading_service() -> Result<()> {
        println!("\n=== Test: gRPC Timeout (Trading Service) ===");

        // Simulate gRPC timeout when notifying Trading Service
        let result = tokio::time::timeout(Duration::from_millis(100), async {
            sleep(Duration::from_millis(200)).await;
        })
        .await;

        assert!(result.is_err()); // Timeout

        Ok(())
    }

    #[tokio::test]
    async fn test_circuit_breaker_active_rejects_orders() -> Result<()> {
        println!("\n=== Test: Circuit Breaker Active ===");

        // Simulate circuit breaker activation
        let circuit_breaker_active = true;

        if circuit_breaker_active {
            // Reject all new orders
            println!("Circuit breaker active - rejecting order");
        }

        assert!(circuit_breaker_active);

        Ok(())
    }
}

// ============================================================================
// Reconnection Tests (5 tests) - Simplified stubs
// ============================================================================

mod reconnection {
    use super::*;

    #[tokio::test]
    async fn test_reconnect_after_disconnect() -> Result<()> {
        println!("\n=== Test: Reconnect After Disconnect ===");

        let server = MockFIXServer::start().await?;

        // Initial connection
        let server_clone = server.clone();
        tokio::spawn(async move {
            server_clone.accept_connection().await.ok();
        });

        sleep(Duration::from_millis(100)).await;
        assert_eq!(server.get_session_state().await, SessionState::LoggedIn);

        // Disconnect
        server.disconnect().await;
        sleep(Duration::from_millis(50)).await;
        assert_eq!(server.get_session_state().await, SessionState::Disconnected);

        // Reconnect would happen here in production
        Ok(())
    }

    #[tokio::test]
    async fn test_reconnect_exponential_backoff() -> Result<()> {
        println!("\n=== Test: Exponential Backoff ===");

        let mut delay = Duration::from_secs(1);

        for attempt in 0..5 {
            println!("Retry attempt {}: delay {:?}", attempt, delay);
            sleep(Duration::from_millis(10)).await; // Simulate retry
            delay *= 2; // Exponential backoff
        }

        assert_eq!(delay, Duration::from_secs(32)); // 1 → 2 → 4 → 8 → 16 → 32

        Ok(())
    }

    #[tokio::test]
    async fn test_reconnect_sequence_recovery() -> Result<()> {
        println!("\n=== Test: Sequence Recovery on Reconnect ===");

        // After reconnect, restore sequences from database
        let sender_seq = 50u64;
        let target_seq = 45u64;

        // Send Logon with last known sequences
        let logon = format!(
            "8=FIX.4.2|9=120|35=A|34={}|49=CLIENT|56=CQG|98=0|108=30|141=N|10=123|",
            sender_seq
        );

        assert!(logon.contains(&format!("34={}", sender_seq)));
        assert!(logon.contains("141=N")); // Don't reset sequences

        Ok(())
    }

    #[tokio::test]
    async fn test_reconnect_max_retries_exceeded() -> Result<()> {
        println!("\n=== Test: Max Retries Exceeded ===");

        let max_retries = 5;
        let mut attempt = 0;

        while attempt < max_retries {
            // Simulate failed connection
            attempt += 1;
            sleep(Duration::from_millis(10)).await;
        }

        assert_eq!(attempt, max_retries);
        println!("Max retries exceeded, giving up");

        Ok(())
    }

    #[tokio::test]
    async fn test_reconnect_order_state_recovery() -> Result<()> {
        println!("\n=== Test: Order State Recovery on Reconnect ===");

        // After reconnect, send OrderStatusRequest for open orders
        let status_request = "8=FIX.4.2|9=120|35=H|34=51|49=CLIENT|56=CQG|\
                              37=BROKER123|11=ORDER_OPEN|55=ES|54=1|10=123|";

        assert!(status_request.contains("35=H")); // OrderStatusRequest
        assert!(status_request.contains("11=ORDER_OPEN"));

        Ok(())
    }
}

// ============================================================================
// Position Tracking Tests (4 tests) - Simplified stubs
// ============================================================================

mod position_tracking {
    use super::*;

    #[tokio::test]
    async fn test_position_update_on_fill() -> Result<()> {
        println!("\n=== Test: Position Update on Fill ===");

        // BUY 10 contracts → position = +10
        let mut position: f64 = 0.0;
        position += 10.0;
        assert_eq!(position, 10.0);

        // SELL 5 contracts → position = +5
        position -= 5.0;
        assert_eq!(position, 5.0);

        Ok(())
    }

    #[tokio::test]
    async fn test_position_redis_cache_consistency() -> Result<()> {
        println!("\n=== Test: Redis Cache Consistency ===");

        // Simulate Redis HINCRBYFLOAT for position update
        let mut cached_position: f64 = 10.0;
        cached_position += 5.0; // Buy 5 more

        assert_eq!(cached_position, 15.0);

        // Database should match Redis
        let db_position: f64 = 15.0;
        assert_eq!(cached_position, db_position);

        Ok(())
    }

    #[tokio::test]
    async fn test_position_reconciliation_on_reconnect() -> Result<()> {
        println!("\n=== Test: Position Reconciliation ===");

        // After reconnect, query broker for current positions
        // Compare with local cache/database
        let broker_position: f64 = 20.0;
        let local_position: f64 = 15.0;

        if (broker_position - local_position).abs() > 0.01 {
            println!(
                "Position mismatch: broker={}, local={}",
                broker_position, local_position
            );
            // Reconcile to broker's position
        }

        Ok(())
    }

    #[tokio::test]
    async fn test_position_flattening_on_close() -> Result<()> {
        println!("\n=== Test: Position Flattening ===");

        let mut position: f64 = 10.0; // Long 10 contracts

        // Flatten position: SELL 10 contracts
        position -= 10.0;
        assert_eq!(position, 0.0);

        // Redis cache should be cleared or set to 0
        Ok(())
    }
}