#![allow(unused_crate_dependencies)]
use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::time::timeout;

use crate::framework::{TestOrchestrator, TestFrameworkConfig, PerformanceThresholds, IntegrationTestResult};
use crate::framework::mocks::MockServiceRegistry;

use config::{ConfigManager, TradingConfig, RiskConfig, MLConfig};
use common::Order;
use common::OrderType;
use common::OrderStatus;
use common::Position;
use common::MarketData;
use common::Tick;
use trading_engine::services::trading::{TradingService, OrderExecutor, PositionManager};
use risk::safety::KillSwitchController;
use trading_engine::events::{OrderEvent, PositionEvent, RiskEvent};
use trading_engine::events::EventBus;

/// Comprehensive Trading Service Integration Tests
///
/// Tests the core trading service functionality including:
/// - Order lifecycle management (creation, execution, cancellation)
///
/// - Position management and tracking
/// - Risk validation integration
///
/// - Market data processing pipeline
/// - Emergency shutdown (kill switch) integration
///
/// - Performance validation for HFT requirements
pub struct TradingServiceTests {
    orchestrator: TestOrchestrator,
    mock_registry: MockServiceRegistry,
    trading_config: TradingConfig,
    risk_config: RiskConfig,
}

impl TradingServiceTests {
    /// Initialize Trading Service test suite with HFT performance thresholds
    pub async fn new() -> Result<Self, Box<dyn std::error::Error>> {
        let config = TestFrameworkConfig {
            performance_thresholds: PerformanceThresholds {
                max_e2e_latency_us: 50,      // 50μs end-to-end
                max_order_latency_us: 20,    // 20μs order processing
                max_risk_latency_us: 10,     // 10μs risk validation
                max_ml_latency_ms: 50,       // 50ms ML inference
                max_config_reload_ms: 100,   // 100ms config reload
                min_throughput_ops_sec: 10000, // 10k ops/sec minimum
            },
            database_url: std::env::var("TEST_DATABASE_URL")
                .unwrap_or_else(|_| "postgresql://test:test@localhost:5432/foxhunt_test".to_string()),
            service_ports: {
                let mut ports = HashMap::new();
                ports.insert("trading".to_string(), 50051);
                ports.insert("backtesting".to_string(), 50052);
                ports.insert("ml_training".to_string(), 50053);
                ports
            },
            test_timeout_secs: 30,
        };

        let orchestrator = TestOrchestrator::new(config).await?;
        let mock_registry = MockServiceRegistry::new().await?;

        // Load trading and risk configurations
        let config_manager = ConfigManager::new().await?;
        let trading_config = config_manager.get_trading_config().await?;
        let risk_config = config_manager.get_risk_config().await?;

        Ok(Self {
            orchestrator,
            mock_registry,
            trading_config,
            risk_config,
        })
    }

    /// Test Suite 1: Order Lifecycle Management
    ///
    /// Validates complete order processing pipeline:
    /// - Order creation and validation
    ///
    /// - Risk checks and position sizing
    /// - Market execution and fill handling
    ///
    /// - Order status updates and event propagation
    pub async fn test_order_lifecycle_management(&self) -> IntegrationTestResult {
        println!("🔄 Testing Trading Service - Order Lifecycle Management");

        let start_time = Instant::now();
        let mut test_results = IntegrationTestResult::new("Trading Service Order Lifecycle");

        // Start trading service
        self.orchestrator.start_service("trading").await
            .map_err(|e| format!("Failed to start trading service: {}", e))?;

        // Wait for service readiness
        tokio::time::sleep(Duration::from_millis(500)).await;

        // Test Case 1: Market Order Creation and Execution
        let market_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "EURUSD".to_string(),
            order_type: OrderType::Market,
            side: common::types::OrderSide::Buy,
            quantity: 100000.0, // Standard lot
            price: None, // Market order
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        // Submit order and measure latency
        let order_start = Instant::now();
        let order_result = self.orchestrator.submit_order(market_order.clone()).await;
        let order_latency = order_start.elapsed();

        // Validate order submission
        match order_result {
            Ok(order_id) => {
                test_results.add_success("Market order submission successful");

                // Validate latency requirement (< 20μs)
                if order_latency.as_micros() <= self.orchestrator.config.performance_thresholds.max_order_latency_us as u128 {
                    test_results.add_success(&format!(
                        "Order latency within threshold: {}μs <= {}μs",
                        order_latency.as_micros(),
                        self.orchestrator.config.performance_thresholds.max_order_latency_us
                    ));
                } else {
                    test_results.add_failure(&format!(
                        "Order latency exceeds threshold: {}μs > {}μs",
                        order_latency.as_micros(),
                        self.orchestrator.config.performance_thresholds.max_order_latency_us
                    ));
                }

                // Wait for order execution and verify status
                tokio::time::sleep(Duration::from_millis(100)).await;

                let order_status = self.orchestrator.get_order_status(&order_id).await?;
                match order_status {
                    OrderStatus::Filled => {
                        test_results.add_success("Market order executed successfully");
                    },
                    OrderStatus::PartiallyFilled => {
                        test_results.add_success("Market order partially filled (acceptable)");
                    },
                    _ => {
                        test_results.add_failure(&format!("Unexpected order status: {:?}", order_status));
                    }
                }
            },
            Err(e) => {
                test_results.add_failure(&format!("Market order submission failed: {}", e));
            }
        }

        // Test Case 2: Limit Order Management
        let limit_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "GBPUSD".to_string(),
            order_type: OrderType::Limit,
            side: common::types::OrderSide::Sell,
            quantity: 50000.0,
            price: Some(1.2650), // Limit price
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        let limit_order_result = self.orchestrator.submit_order(limit_order.clone()).await;
        match limit_order_result {
            Ok(order_id) => {
                test_results.add_success("Limit order submission successful");

                // Test order cancellation
                tokio::time::sleep(Duration::from_millis(50)).await;
                let cancel_result = self.orchestrator.cancel_order(&order_id).await;

                match cancel_result {
                    Ok(_) => {
                        test_results.add_success("Order cancellation successful");

                        // Verify order status updated to cancelled
                        let status = self.orchestrator.get_order_status(&order_id).await?;
                        if status == OrderStatus::Cancelled {
                            test_results.add_success("Order status correctly updated to cancelled");
                        } else {
                            test_results.add_failure(&format!("Order status not cancelled: {:?}", status));
                        }
                    },
                    Err(e) => {
                        test_results.add_failure(&format!("Order cancellation failed: {}", e));
                    }
                }
            },
            Err(e) => {
                test_results.add_failure(&format!("Limit order submission failed: {}", e));
            }
        }

        // Test Case 3: Risk Validation Integration
        let oversized_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "EURUSD".to_string(),
            order_type: OrderType::Market,
            side: common::types::OrderSide::Buy,
            quantity: 10_000_000.0, // Intentionally large to trigger risk checks
            price: None,
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        let risk_check_start = Instant::now();
        let risk_result = self.orchestrator.submit_order(oversized_order.clone()).await;
        let risk_latency = risk_check_start.elapsed();

        // Should be rejected by risk management
        match risk_result {
            Err(e) if e.to_string().contains("risk") || e.to_string().contains("limit") => {
                test_results.add_success("Risk validation correctly rejected oversized order");

                // Validate risk check latency (< 10μs)
                if risk_latency.as_micros() <= self.orchestrator.config.performance_thresholds.max_risk_latency_us as u128 {
                    test_results.add_success(&format!(
                        "Risk validation latency within threshold: {}μs <= {}μs",
                        risk_latency.as_micros(),
                        self.orchestrator.config.performance_thresholds.max_risk_latency_us
                    ));
                } else {
                    test_results.add_failure(&format!(
                        "Risk validation latency exceeds threshold: {}μs > {}μs",
                        risk_latency.as_micros(),
                        self.orchestrator.config.performance_thresholds.max_risk_latency_us
                    ));
                }
            },
            Ok(_) => {
                test_results.add_failure("Risk validation failed - oversized order should have been rejected");
            },
            Err(e) => {
                test_results.add_failure(&format!("Unexpected error in risk validation: {}", e));
            }
        }

        test_results.duration = start_time.elapsed();
        test_results.finalize();

        Ok(test_results)
    }

    /// Test Suite 2: Position Management and Tracking
    ///
    /// Validates position lifecycle and management:
    /// - Position opening and tracking
    ///
    /// - PnL calculation accuracy
    /// - Position closing and settlement
    ///
    /// - Multi-symbol position management
    pub async fn test_position_management(&self) -> IntegrationTestResult {
        println!("📊 Testing Trading Service - Position Management");

        let start_time = Instant::now();
        let mut test_results = IntegrationTestResult::new("Trading Service Position Management");

        // Test Case 1: Position Opening
        let buy_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "EURUSD".to_string(),
            order_type: OrderType::Market,
            side: common::types::OrderSide::Buy,
            quantity: 100000.0,
            price: None,
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        let order_result = self.orchestrator.submit_order(buy_order.clone()).await?;
        tokio::time::sleep(Duration::from_millis(100)).await;

        // Verify position was created
        let positions = self.orchestrator.get_positions().await?;
        let eurusd_position = positions.iter().find(|p| p.symbol == "EURUSD");

        match eurusd_position {
            Some(position) => {
                test_results.add_success("Position created successfully");

                if position.quantity == 100000.0 {
                    test_results.add_success("Position quantity matches order");
                } else {
                    test_results.add_failure(&format!(
                        "Position quantity mismatch: expected 100000.0, got {}",
                        position.quantity
                    ));
                }

                if position.unrealized_pnl.is_some() {
                    test_results.add_success("Position PnL calculation active");
                } else {
                    test_results.add_failure("Position PnL not calculated");
                }
            },
            None => {
                test_results.add_failure("Position not found after order execution");
            }
        }

        // Test Case 2: Position Modification (Partial Close)
        let partial_close_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "EURUSD".to_string(),
            order_type: OrderType::Market,
            side: common::types::OrderSide::Sell,
            quantity: 50000.0, // Close half
            price: None,
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        self.orchestrator.submit_order(partial_close_order).await?;
        tokio::time::sleep(Duration::from_millis(100)).await;

        // Verify position was reduced
        let updated_positions = self.orchestrator.get_positions().await?;
        let updated_eurusd_position = updated_positions.iter().find(|p| p.symbol == "EURUSD");

        match updated_eurusd_position {
            Some(position) => {
                if position.quantity == 50000.0 {
                    test_results.add_success("Position partially closed successfully");
                } else {
                    test_results.add_failure(&format!(
                        "Position partial close incorrect: expected 50000.0, got {}",
                        position.quantity
                    ));
                }
            },
            None => {
                test_results.add_failure("Position disappeared after partial close");
            }
        }

        // Test Case 3: Multi-Symbol Position Management
        let gbpusd_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "GBPUSD".to_string(),
            order_type: OrderType::Market,
            side: common::types::OrderSide::Buy,
            quantity: 75000.0,
            price: None,
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        self.orchestrator.submit_order(gbpusd_order).await?;
        tokio::time::sleep(Duration::from_millis(100)).await;

        // Verify multiple positions are tracked
        let all_positions = self.orchestrator.get_positions().await?;
        let eurusd_count = all_positions.iter().filter(|p| p.symbol == "EURUSD").count();
        let gbpusd_count = all_positions.iter().filter(|p| p.symbol == "GBPUSD").count();

        if eurusd_count == 1 && gbpusd_count == 1 {
            test_results.add_success("Multi-symbol position management working");
        } else {
            test_results.add_failure(&format!(
                "Multi-symbol position issue: EURUSD count {}, GBPUSD count {}",
                eurusd_count, gbpusd_count
            ));
        }

        test_results.duration = start_time.elapsed();
        test_results.finalize();

        Ok(test_results)
    }

    /// Test Suite 3: Market Data Integration
    ///
    /// Validates market data processing and order book management:
    /// - Real-time tick processing
    ///
    /// - Price feed integration
    /// - Order book depth updates
    ///
    /// - Market data latency validation
    pub async fn test_market_data_integration(&self) -> IntegrationTestResult {
        println!("📈 Testing Trading Service - Market Data Integration");

        let start_time = Instant::now();
        let mut test_results = IntegrationTestResult::new("Trading Service Market Data Integration");

        // Test Case 1: Market Data Subscription
        let symbols = vec!["EURUSD".to_string(), "GBPUSD".to_string(), "USDJPY".to_string()];

        for symbol in &symbols {
            let subscription_result = self.orchestrator.subscribe_market_data(symbol).await;

            match subscription_result {
                Ok(_) => {
                    test_results.add_success(&format!("Market data subscription successful for {}", symbol));
                },
                Err(e) => {
                    test_results.add_failure(&format!("Market data subscription failed for {}: {}", symbol, e));
                }
            }
        }

        // Test Case 2: Real-time Tick Processing
        tokio::time::sleep(Duration::from_millis(200)).await; // Allow ticks to flow

        for symbol in &symbols {
            let latest_tick = self.orchestrator.get_latest_tick(symbol).await;

            match latest_tick {
                Ok(Some(tick)) => {
                    test_results.add_success(&format!("Received tick data for {}", symbol));

                    // Validate tick data completeness
                    if tick.bid > 0.0 && tick.ask > 0.0 && tick.ask > tick.bid {
                        test_results.add_success(&format!("Valid bid/ask spread for {}", symbol));
                    } else {
                        test_results.add_failure(&format!("Invalid bid/ask data for {}: bid={}, ask={}",
                            symbol, tick.bid, tick.ask));
                    }

                    // Validate timestamp freshness (within last second)
                    let tick_age = chrono::Utc::now().signed_duration_since(tick.timestamp);
                    if tick_age.num_seconds() <= 1 {
                        test_results.add_success(&format!("Fresh tick data for {} ({}s old)", symbol, tick_age.num_seconds()));
                    } else {
                        test_results.add_failure(&format!("Stale tick data for {} ({}s old)", symbol, tick_age.num_seconds()));
                    }
                },
                Ok(None) => {
                    test_results.add_failure(&format!("No tick data received for {}", symbol));
                },
                Err(e) => {
                    test_results.add_failure(&format!("Error retrieving tick data for {}: {}", symbol, e));
                }
            }
        }

        // Test Case 3: Market Data Latency Validation
        let latency_test_start = Instant::now();
        let tick_result = self.orchestrator.get_latest_tick("EURUSD").await;
        let market_data_latency = latency_test_start.elapsed();

        match tick_result {
            Ok(_) => {
                if market_data_latency.as_micros() <= 1000 { // < 1ms acceptable
                    test_results.add_success(&format!("Market data latency acceptable: {}μs", market_data_latency.as_micros()));
                } else {
                    test_results.add_failure(&format!("Market data latency too high: {}μs", market_data_latency.as_micros()));
                }
            },
            Err(e) => {
                test_results.add_failure(&format!("Market data latency test failed: {}", e));
            }
        }

        test_results.duration = start_time.elapsed();
        test_results.finalize();

        Ok(test_results)
    }

    /// Test Suite 4: Emergency Shutdown Integration
    ///
    /// Validates kill switch functionality:
    /// - Emergency order cancellation
    ///
    /// - Position force-close capability
    /// - Service shutdown coordination
    ///
    /// - Recovery procedures
    pub async fn test_emergency_shutdown_integration(&self) -> IntegrationTestResult {
        println!("🚨 Testing Trading Service - Emergency Shutdown Integration");

        let start_time = Instant::now();
        let mut test_results = IntegrationTestResult::new("Trading Service Emergency Shutdown");

        // Set up test scenario with active orders and positions
        let setup_order = Order {
            id: uuid::Uuid::new_v4(),
            symbol: "EURUSD".to_string(),
            order_type: OrderType::Limit,
            side: common::types::OrderSide::Buy,
            quantity: 100000.0,
            price: Some(1.0000), // Far from market to stay pending
            status: OrderStatus::Pending,
            created_at: chrono::Utc::now(),
            filled_quantity: 0.0,
            average_fill_price: None,
        };

        let order_id = self.orchestrator.submit_order(setup_order).await?;
        tokio::time::sleep(Duration::from_millis(100)).await;

        // Test Case 1: Emergency Kill Switch Activation
        let kill_switch_start = Instant::now();
        let kill_switch_result = self.orchestrator.activate_kill_switch("test_emergency").await;
        let kill_switch_latency = kill_switch_start.elapsed();

        match kill_switch_result {
            Ok(_) => {
                test_results.add_success("Kill switch activation successful");

                // Validate kill switch latency (should be < 1ms)
                if kill_switch_latency.as_millis() <= 1 {
                    test_results.add_success(&format!("Kill switch latency acceptable: {}μs", kill_switch_latency.as_micros()));
                } else {
                    test_results.add_failure(&format!("Kill switch latency too high: {}ms", kill_switch_latency.as_millis()));
                }
            },
            Err(e) => {
                test_results.add_failure(&format!("Kill switch activation failed: {}", e));
            }
        }

        // Test Case 2: Verify All Orders Cancelled
        tokio::time::sleep(Duration::from_millis(200)).await;

        let order_status = self.orchestrator.get_order_status(&order_id).await?;
        if order_status == OrderStatus::Cancelled {
            test_results.add_success("Pending orders cancelled by kill switch");
        } else {
            test_results.add_failure(&format!("Order not cancelled by kill switch: status {:?}", order_status));
        }

        // Test Case 3: Verify Service State After Kill Switch
        let service_health = self.orchestrator.check_service_health("trading").await;
        match service_health {
            Ok(health) if health.status == "emergency_shutdown" || health.status == "stopped" => {
                test_results.add_success("Trading service correctly in emergency shutdown state");
            },
            Ok(health) => {
                test_results.add_failure(&format!("Unexpected service state after kill switch: {}", health.status));
            },
            Err(e) => {
                test_results.add_failure(&format!("Could not check service health after kill switch: {}", e));
            }
        }

        // Test Case 4: Recovery Procedure
        let recovery_result = self.orchestrator.recover_from_kill_switch().await;
        match recovery_result {
            Ok(_) => {
                test_results.add_success("Kill switch recovery initiated");

                // Wait for service recovery
                tokio::time::sleep(Duration::from_millis(500)).await;

                let recovered_health = self.orchestrator.check_service_health("trading").await;
                match recovered_health {
                    Ok(health) if health.status == "healthy" || health.status == "running" => {
                        test_results.add_success("Trading service recovered successfully");
                    },
                    Ok(health) => {
                        test_results.add_failure(&format!("Service not fully recovered: status {}", health.status));
                    },
                    Err(e) => {
                        test_results.add_failure(&format!("Could not verify service recovery: {}", e));
                    }
                }
            },
            Err(e) => {
                test_results.add_failure(&format!("Kill switch recovery failed: {}", e));
            }
        }

        test_results.duration = start_time.elapsed();
        test_results.finalize();

        Ok(test_results)
    }

    /// Execute complete Trading Service test suite
    pub async fn run_all_tests(&self) -> Result<Vec<IntegrationTestResult>, Box<dyn std::error::Error>> {
        println!("🚀 Starting Trading Service Integration Test Suite");

        let mut results = Vec::new();

        // Test Suite 1: Order Lifecycle Management
        match timeout(Duration::from_secs(self.orchestrator.config.test_timeout_secs),
                     self.test_order_lifecycle_management()).await {
            Ok(Ok(result)) => results.push(result),
            Ok(Err(e)) => {
                let mut failed_result = IntegrationTestResult::new("Trading Service Order Lifecycle");
                failed_result.add_failure(&format!("Test suite failed: {}", e));
                failed_result.finalize();
                results.push(failed_result);
            },
            Err(_) => {
                let mut timeout_result = IntegrationTestResult::new("Trading Service Order Lifecycle");
                timeout_result.add_failure("Test suite timed out");
                timeout_result.finalize();
                results.push(timeout_result);
            }
        }

        // Test Suite 2: Position Management
        match timeout(Duration::from_secs(self.orchestrator.config.test_timeout_secs),
                     self.test_position_management()).await {
            Ok(Ok(result)) => results.push(result),
            Ok(Err(e)) => {
                let mut failed_result = IntegrationTestResult::new("Trading Service Position Management");
                failed_result.add_failure(&format!("Test suite failed: {}", e));
                failed_result.finalize();
                results.push(failed_result);
            },
            Err(_) => {
                let mut timeout_result = IntegrationTestResult::new("Trading Service Position Management");
                timeout_result.add_failure("Test suite timed out");
                timeout_result.finalize();
                results.push(timeout_result);
            }
        }

        // Test Suite 3: Market Data Integration
        match timeout(Duration::from_secs(self.orchestrator.config.test_timeout_secs),
                     self.test_market_data_integration()).await {
            Ok(Ok(result)) => results.push(result),
            Ok(Err(e)) => {
                let mut failed_result = IntegrationTestResult::new("Trading Service Market Data Integration");
                failed_result.add_failure(&format!("Test suite failed: {}", e));
                failed_result.finalize();
                results.push(failed_result);
            },
            Err(_) => {
                let mut timeout_result = IntegrationTestResult::new("Trading Service Market Data Integration");
                timeout_result.add_failure("Test suite timed out");
                timeout_result.finalize();
                results.push(timeout_result);
            }
        }

        // Test Suite 4: Emergency Shutdown Integration
        match timeout(Duration::from_secs(self.orchestrator.config.test_timeout_secs),
                     self.test_emergency_shutdown_integration()).await {
            Ok(Ok(result)) => results.push(result),
            Ok(Err(e)) => {
                let mut failed_result = IntegrationTestResult::new("Trading Service Emergency Shutdown");
                failed_result.add_failure(&format!("Test suite failed: {}", e));
                failed_result.finalize();
                results.push(failed_result);
            },
            Err(_) => {
                let mut timeout_result = IntegrationTestResult::new("Trading Service Emergency Shutdown");
                timeout_result.add_failure("Test suite timed out");
                timeout_result.finalize();
                results.push(timeout_result);
            }
        }

        // Print summary
        let total_tests = results.len();
        let passed_tests = results.iter().filter(|r| r.passed).count();
        let failed_tests = total_tests - passed_tests;

        println!("📊 Trading Service Integration Test Summary:");
        println!("   Total Test Suites: {}", total_tests);
        println!("   Passed: {} ✅", passed_tests);
        println!("   Failed: {} ❌", failed_tests);

        if failed_tests == 0 {
            println!("🎉 All Trading Service integration tests passed!");
        } else {
            println!("⚠️ {} Trading Service integration test suite(s) failed", failed_tests);
        }

        Ok(results)
    }
}

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

    #[tokio::test]
    async fn integration_test_trading_service_complete() {
        let test_suite = TradingServiceTests::new().await
            .expect("Failed to initialize Trading Service test suite");

        let results = test_suite.run_all_tests().await
            .expect("Failed to run Trading Service test suite");

        // Ensure all tests passed
        for result in &results {
            assert!(result.passed, "Test suite '{}' failed: {:?}", result.test_name, result.failures);
        }

        // Validate performance requirements met
        for result in &results {
            assert!(
                result.duration.as_millis() <= 5000,
                "Test suite '{}' took too long: {}ms",
                result.test_name,
                result.duration.as_millis()
            );
        }
    }
}