//! Integrated Optimization Execution Engine for CUDA Memory Management
//!
//! This module provides a comprehensive, modular execution engine that integrates
//! all specialized components for optimization strategy execution including advanced
//! task management, resource allocation, fault tolerance, performance monitoring,
//! security management, load balancing, and hardware abstraction.

use std::collections::{HashMap, VecDeque, BTreeSet, BinaryHeap};
use std::cmp::Ordering;
use std::sync::{Arc, Mutex, RwLock, atomic::{AtomicU64, AtomicBool, Ordering as AtomicOrdering}};
use std::time::{Duration, Instant, SystemTime};
use std::thread;
use serde::{Serialize, Deserialize};
use scirs2_core::random::{Random, rng};
use scirs2_core::ndarray::{Array1, Array2, ArrayView1, array};

// Import the new modular components
use super::execution_engine::{
    TaskManager, TaskId, TaskPriority, TaskStatus,
    ResourceManager, ResourceId, ResourceType,
    FaultToleranceManager, FailureHandlingResult, RetryDecision,
    PerformanceMonitoringManager, MetricDataPoint, BottleneckRecord,
    SecurityManager, AuthenticationResult, SecuritySession,
    LoadBalancingManager, WorkloadDistribution, LoadLevel,
    HardwareManager, GpuDevice, HealthStatus,
    // Configuration types
    ExecutionEngineConfig, TaskConfig, ResourceConfig, FaultToleranceConfig,
    PerformanceMonitoringConfig, SecurityConfig, LoadBalancingConfig, HardwareConfig,
};

/// Comprehensive integrated optimization execution engine
///
/// This engine integrates all modular components to provide enterprise-grade
/// optimization execution with advanced scheduling, resource management,
/// fault tolerance, security, and performance monitoring capabilities.
#[derive(Debug)]
pub struct IntegratedOptimizationExecutionEngine {
    /// Modular task management system
    task_manager: Arc<Mutex<TaskManager>>,

    /// Modular resource management system
    resource_manager: Arc<Mutex<ResourceManager>>,

    /// Fault tolerance and recovery system
    fault_tolerance: Arc<Mutex<FaultToleranceManager>>,

    /// Performance monitoring and metrics
    performance_monitor: Arc<Mutex<PerformanceMonitoringManager>>,

    /// Security and access control system
    security_manager: Arc<Mutex<SecurityManager>>,

    /// Load balancing and distribution system
    load_balancer: Arc<Mutex<LoadBalancingManager>>,

    /// Hardware management and abstraction
    hardware_manager: Arc<Mutex<HardwareManager>>,

    /// Legacy execution queue for backward compatibility
    execution_queue: Arc<Mutex<VecDeque<OptimizationTask>>>,

    /// Currently active optimizations
    active_optimizations: Arc<RwLock<HashMap<String, ActiveOptimization>>>,

    /// Execution history tracking
    execution_history: Arc<Mutex<VecDeque<ExecutionRecord>>>,

    /// Execution configuration
    config: IntegratedExecutionConfig,

    /// Engine state
    engine_state: Arc<RwLock<IntegratedEngineState>>,

    /// Execution statistics
    statistics: Arc<Mutex<ExecutionStatistics>>,
}

/// Configuration for the integrated execution engine
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntegratedExecutionConfig {
    /// Maximum concurrent executions
    pub max_concurrent_executions: usize,

    /// Default task timeout
    pub default_timeout: Duration,

    /// Enable distributed execution
    pub enable_distributed: bool,

    /// Task management configuration
    pub task_config: TaskConfig,

    /// Resource management configuration
    pub resource_config: ResourceConfig,

    /// Fault tolerance configuration
    pub fault_tolerance_config: FaultToleranceConfig,

    /// Performance monitoring configuration
    pub performance_monitoring_config: PerformanceMonitoringConfig,

    /// Security management configuration
    pub security_config: SecurityConfig,

    /// Load balancing configuration
    pub load_balancing_config: LoadBalancingConfig,

    /// Hardware management configuration
    pub hardware_config: HardwareConfig,

    /// Legacy compatibility settings
    pub legacy_compatibility: LegacyCompatibilityConfig,
}

/// Engine state for the integrated system
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntegratedEngineState {
    /// Engine status
    pub status: EngineStatus,

    /// Initialization timestamp
    pub initialized_at: Option<SystemTime>,

    /// Last activity timestamp
    pub last_activity: SystemTime,

    /// Active task count
    pub active_task_count: usize,

    /// System health score
    pub system_health_score: f64,

    /// Performance metrics summary
    pub performance_summary: PerformanceSummary,

    /// Security status
    pub security_status: SecurityStatusSummary,

    /// Resource utilization summary
    pub resource_utilization: ResourceUtilizationSummary,
}

/// Execution statistics for monitoring
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionStatistics {
    /// Total tasks executed
    pub total_tasks_executed: u64,

    /// Successfully completed tasks
    pub successful_tasks: u64,

    /// Failed tasks
    pub failed_tasks: u64,

    /// Retried tasks
    pub retried_tasks: u64,

    /// Average execution time
    pub average_execution_time: Duration,

    /// Resource allocation efficiency
    pub resource_efficiency: f64,

    /// System uptime
    pub system_uptime: Duration,

    /// Performance optimization count
    pub optimizations_performed: u64,
}

/// Compatibility configuration for legacy systems
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LegacyCompatibilityConfig {
    /// Enable legacy API compatibility
    pub enable_legacy_api: bool,

    /// Legacy task format support
    pub support_legacy_tasks: bool,

    /// Legacy result format
    pub legacy_result_format: bool,

    /// Compatibility mode level
    pub compatibility_level: CompatibilityLevel,
}

/// Engine status enumeration
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EngineStatus {
    Uninitialized,
    Initializing,
    Running,
    Paused,
    Stopping,
    Stopped,
    Error,
}

/// Compatibility levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum CompatibilityLevel {
    Full,
    Partial,
    Minimal,
    None,
}

// Legacy types for backward compatibility
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizationTask {
    pub task_id: String,
    pub task_type: String,
    pub parameters: HashMap<String, String>,
    pub priority: u32,
    pub timeout: Option<Duration>,
    pub dependencies: Vec<String>,
    pub created_at: SystemTime,
    pub scheduled_at: Option<SystemTime>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ActiveOptimization {
    pub optimization_id: String,
    pub task_id: String,
    pub started_at: SystemTime,
    pub status: OptimizationStatus,
    pub progress: f64,
    pub current_stage: String,
    pub resources_allocated: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionRecord {
    pub execution_id: String,
    pub task_id: String,
    pub started_at: SystemTime,
    pub completed_at: Option<SystemTime>,
    pub status: ExecutionStatus,
    pub result: Option<ExecutionResult>,
    pub error: Option<String>,
    pub metrics: ExecutionMetrics,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum OptimizationStatus {
    Pending,
    Running,
    Completed,
    Failed,
    Cancelled,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ExecutionStatus {
    Scheduled,
    Running,
    Completed,
    Failed,
    Timeout,
    Cancelled,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionResult {
    pub optimization_results: HashMap<String, f64>,
    pub performance_metrics: HashMap<String, f64>,
    pub resource_usage: HashMap<String, f64>,
    pub quality_score: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionMetrics {
    pub execution_time: Duration,
    pub resource_utilization: f64,
    pub memory_usage: u64,
    pub cpu_usage: f64,
    pub gpu_usage: Option<f64>,
}

// Summary types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceSummary {
    pub overall_performance_score: f64,
    pub bottleneck_count: usize,
    pub optimization_opportunities: usize,
    pub average_response_time: Duration,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecurityStatusSummary {
    pub threat_level: String,
    pub active_sessions: usize,
    pub failed_authentication_attempts: u64,
    pub security_events: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResourceUtilizationSummary {
    pub cpu_utilization: f64,
    pub memory_utilization: f64,
    pub gpu_utilization: f64,
    pub storage_utilization: f64,
}

impl IntegratedOptimizationExecutionEngine {
    /// Create a new integrated execution engine
    pub fn new(config: IntegratedExecutionConfig) -> Result<Self, IntegratedExecutionError> {
        let engine = Self {
            task_manager: Arc::new(Mutex::new(TaskManager::new(config.task_config.clone())?)),
            resource_manager: Arc::new(Mutex::new(ResourceManager::new(config.resource_config.clone())?)),
            fault_tolerance: Arc::new(Mutex::new(FaultToleranceManager::new(config.fault_tolerance_config.clone()))),
            performance_monitor: Arc::new(Mutex::new(PerformanceMonitoringManager::new(config.performance_monitoring_config.clone()))),
            security_manager: Arc::new(Mutex::new(SecurityManager::new(config.security_config.clone()))),
            load_balancer: Arc::new(Mutex::new(LoadBalancingManager::new(config.load_balancing_config.clone()))),
            hardware_manager: Arc::new(Mutex::new(HardwareManager::new(config.hardware_config.clone()))),
            execution_queue: Arc::new(Mutex::new(VecDeque::new())),
            active_optimizations: Arc::new(RwLock::new(HashMap::new())),
            execution_history: Arc::new(Mutex::new(VecDeque::new())),
            config,
            engine_state: Arc::new(RwLock::new(IntegratedEngineState::new())),
            statistics: Arc::new(Mutex::new(ExecutionStatistics::new())),
        };

        Ok(engine)
    }

    /// Initialize the integrated execution engine
    pub async fn initialize(&self) -> Result<(), IntegratedExecutionError> {
        // Update engine state
        {
            let mut state = self.engine_state.write().expect("lock should not be poisoned");
            state.status = EngineStatus::Initializing;
        }

        // Initialize hardware management
        {
            let hardware_manager = self.hardware_manager.lock().expect("lock should not be poisoned");
            hardware_manager.initialize_hardware()
                .map_err(|e| IntegratedExecutionError::HardwareInitializationError(format!("{:?}", e)))?;
        }

        // Initialize security system
        {
            let security_manager = self.security_manager.lock().expect("lock should not be poisoned");
            // Security initialization would happen here
        }

        // Start performance monitoring
        {
            let performance_monitor = self.performance_monitor.lock().expect("lock should not be poisoned");
            performance_monitor.start_monitoring()
                .map_err(|e| IntegratedExecutionError::PerformanceMonitoringError(format!("{:?}", e)))?;
        }

        // Start load balancing
        {
            let load_balancer = self.load_balancer.lock().expect("lock should not be poisoned");
            load_balancer.start_load_balancing()
                .map_err(|e| IntegratedExecutionError::LoadBalancingError(format!("{:?}", e)))?;
        }

        // Initialize task management
        {
            let task_manager = self.task_manager.lock().expect("lock should not be poisoned");
            task_manager.initialize()
                .map_err(|e| IntegratedExecutionError::TaskManagementError(format!("{:?}", e)))?;
        }

        // Update engine state
        {
            let mut state = self.engine_state.write().expect("lock should not be poisoned");
            state.status = EngineStatus::Running;
            state.initialized_at = Some(SystemTime::now());
            state.last_activity = SystemTime::now();
        }

        Ok(())
    }

    /// Execute an optimization task using the integrated system
    pub async fn execute_optimization(&self, task: OptimizationTask) -> Result<ExecutionResult, IntegratedExecutionError> {
        // Convert legacy task to new task format
        let new_task_id = {
            let mut task_manager = self.task_manager.lock().expect("lock should not be poisoned");
            task_manager.submit_task(
                task.task_type.clone(),
                task.parameters.clone(),
                TaskPriority::from_u32(task.priority),
            ).map_err(|e| IntegratedExecutionError::TaskManagementError(format!("{:?}", e)))?
        };

        // Allocate resources
        let resource_requirements = self.determine_resource_requirements(&task)?;
        let resource_allocation = {
            let mut resource_manager = self.resource_manager.lock().expect("lock should not be poisoned");
            resource_manager.allocate_resources(resource_requirements)
                .map_err(|e| IntegratedExecutionError::ResourceAllocationError(format!("{:?}", e)))?
        };

        // Create active optimization record
        let optimization_id = uuid::Uuid::new_v4().to_string();
        let active_optimization = ActiveOptimization {
            optimization_id: optimization_id.clone(),
            task_id: new_task_id.to_string(),
            started_at: SystemTime::now(),
            status: OptimizationStatus::Running,
            progress: 0.0,
            current_stage: "initialization".to_string(),
            resources_allocated: vec![resource_allocation],
        };

        {
            let mut active_opts = self.active_optimizations.write().expect("lock should not be poisoned");
            active_opts.insert(optimization_id.clone(), active_optimization);
        }

        // Execute the task with fault tolerance
        let execution_result = self.execute_with_fault_tolerance(new_task_id, &task).await?;

        // Update statistics
        {
            let mut stats = self.statistics.lock().expect("lock should not be poisoned");
            stats.total_tasks_executed += 1;
            if execution_result.quality_score > 0.7 {
                stats.successful_tasks += 1;
            } else {
                stats.failed_tasks += 1;
            }
        }

        // Clean up active optimization
        {
            let mut active_opts = self.active_optimizations.write().expect("lock should not be poisoned");
            if let Some(mut opt) = active_opts.remove(&optimization_id) {
                opt.status = OptimizationStatus::Completed;
                opt.progress = 1.0;
            }
        }

        // Release resources
        {
            let mut resource_manager = self.resource_manager.lock().expect("lock should not be poisoned");
            resource_manager.release_resources(&resource_allocation)
                .map_err(|e| IntegratedExecutionError::ResourceAllocationError(format!("{:?}", e)))?;
        }

        Ok(execution_result)
    }

    /// Get current system status
    pub fn get_system_status(&self) -> IntegratedSystemStatus {
        let engine_state = self.engine_state.read().expect("lock should not be poisoned");
        let statistics = self.statistics.lock().expect("lock should not be poisoned");

        // Get component status
        let hardware_health = {
            let hardware_manager = self.hardware_manager.lock().expect("lock should not be poisoned");
            hardware_manager.get_hardware_statistics()
        };

        let performance_metrics = {
            let performance_monitor = self.performance_monitor.lock().expect("lock should not be poisoned");
            performance_monitor.get_performance_statistics()
        };

        let security_metrics = {
            let security_manager = self.security_manager.lock().expect("lock should not be poisoned");
            security_manager.get_security_metrics()
        };

        let load_balancing_stats = {
            let load_balancer = self.load_balancer.lock().expect("lock should not be poisoned");
            load_balancer.get_statistics()
        };

        IntegratedSystemStatus {
            engine_status: engine_state.status,
            system_health_score: engine_state.system_health_score,
            uptime: SystemTime::now().duration_since(engine_state.initialized_at.unwrap_or(SystemTime::now())).unwrap_or(Duration::from_secs(0)),
            active_tasks: engine_state.active_task_count,
            total_tasks_executed: statistics.total_tasks_executed,
            success_rate: if statistics.total_tasks_executed > 0 {
                statistics.successful_tasks as f64 / statistics.total_tasks_executed as f64
            } else {
                0.0
            },
            hardware_statistics: hardware_health,
            performance_metrics,
            security_metrics,
            load_balancing_statistics: load_balancing_stats,
        }
    }

    /// Optimize system performance using integrated monitoring
    pub async fn optimize_system_performance(&self) -> Result<OptimizationReport, IntegratedExecutionError> {
        // Get current performance status
        let bottlenecks = {
            let performance_monitor = self.performance_monitor.lock().expect("lock should not be poisoned");
            performance_monitor.detect_bottlenecks()
                .map_err(|e| IntegratedExecutionError::PerformanceMonitoringError(format!("{:?}", e)))?
        };

        // Get optimization recommendations
        let recommendations = {
            let performance_monitor = self.performance_monitor.lock().expect("lock should not be poisoned");
            performance_monitor.get_optimization_recommendations()
                .map_err(|e| IntegratedExecutionError::PerformanceMonitoringError(format!("{:?}", e)))?
        };

        // Optimize load balancing
        let new_strategy = {
            let load_balancer = self.load_balancer.lock().expect("lock should not be poisoned");
            load_balancer.adapt_strategy()
                .map_err(|e| IntegratedExecutionError::LoadBalancingError(format!("{:?}", e)))?
        };

        Ok(OptimizationReport {
            optimization_id: uuid::Uuid::new_v4().to_string(),
            timestamp: SystemTime::now(),
            bottlenecks_identified: bottlenecks,
            recommendations: recommendations,
            load_balancing_strategy: format!("{:?}", new_strategy),
            expected_improvement: 15.0, // Placeholder
            confidence_score: 0.85,
        })
    }

    // Private helper methods
    async fn execute_with_fault_tolerance(&self, task_id: TaskId, task: &OptimizationTask) -> Result<ExecutionResult, IntegratedExecutionError> {
        // Implementation would execute the task with fault tolerance
        // For now, return a placeholder result
        Ok(ExecutionResult {
            optimization_results: HashMap::new(),
            performance_metrics: HashMap::new(),
            resource_usage: HashMap::new(),
            quality_score: 0.85,
        })
    }

    fn determine_resource_requirements(&self, task: &OptimizationTask) -> Result<super::execution_engine::resource_management::ResourceRequirements, IntegratedExecutionError> {
        // Implementation would analyze task to determine resource requirements
        Ok(super::execution_engine::resource_management::ResourceRequirements::default())
    }
}

// Additional types for the integrated system

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntegratedSystemStatus {
    pub engine_status: EngineStatus,
    pub system_health_score: f64,
    pub uptime: Duration,
    pub active_tasks: usize,
    pub total_tasks_executed: u64,
    pub success_rate: f64,
    pub hardware_statistics: super::execution_engine::hardware_management::HardwareStatistics,
    pub performance_metrics: super::execution_engine::performance_monitoring::PerformanceStatistics,
    pub security_metrics: super::execution_engine::security_management::SecurityMetrics,
    pub load_balancing_statistics: super::execution_engine::load_balancing::LoadBalancingStatistics,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizationReport {
    pub optimization_id: String,
    pub timestamp: SystemTime,
    pub bottlenecks_identified: Vec<BottleneckRecord>,
    pub recommendations: Vec<super::execution_engine::performance_monitoring::OptimizationRecommendation>,
    pub load_balancing_strategy: String,
    pub expected_improvement: f64,
    pub confidence_score: f64,
}

// Error types
#[derive(Debug, thiserror::Error)]
pub enum IntegratedExecutionError {
    #[error("Task management error: {0}")]
    TaskManagementError(String),
    #[error("Resource allocation error: {0}")]
    ResourceAllocationError(String),
    #[error("Fault tolerance error: {0}")]
    FaultToleranceError(String),
    #[error("Performance monitoring error: {0}")]
    PerformanceMonitoringError(String),
    #[error("Security management error: {0}")]
    SecurityManagementError(String),
    #[error("Load balancing error: {0}")]
    LoadBalancingError(String),
    #[error("Hardware initialization error: {0}")]
    HardwareInitializationError(String),
    #[error("Configuration error: {0}")]
    ConfigurationError(String),
    #[error("System error: {0}")]
    SystemError(String),
}

// Default implementations

impl Default for IntegratedExecutionConfig {
    fn default() -> Self {
        Self {
            max_concurrent_executions: 10,
            default_timeout: Duration::from_secs(300),
            enable_distributed: false,
            task_config: TaskConfig::default(),
            resource_config: ResourceConfig::default(),
            fault_tolerance_config: FaultToleranceConfig::default(),
            performance_monitoring_config: PerformanceMonitoringConfig::default(),
            security_config: SecurityConfig::default(),
            load_balancing_config: LoadBalancingConfig::default(),
            hardware_config: HardwareConfig::default(),
            legacy_compatibility: LegacyCompatibilityConfig::default(),
        }
    }
}

impl Default for LegacyCompatibilityConfig {
    fn default() -> Self {
        Self {
            enable_legacy_api: true,
            support_legacy_tasks: true,
            legacy_result_format: false,
            compatibility_level: CompatibilityLevel::Partial,
        }
    }
}

impl IntegratedEngineState {
    fn new() -> Self {
        Self {
            status: EngineStatus::Uninitialized,
            initialized_at: None,
            last_activity: SystemTime::now(),
            active_task_count: 0,
            system_health_score: 1.0,
            performance_summary: PerformanceSummary::default(),
            security_status: SecurityStatusSummary::default(),
            resource_utilization: ResourceUtilizationSummary::default(),
        }
    }
}

impl ExecutionStatistics {
    fn new() -> Self {
        Self {
            total_tasks_executed: 0,
            successful_tasks: 0,
            failed_tasks: 0,
            retried_tasks: 0,
            average_execution_time: Duration::from_secs(0),
            resource_efficiency: 0.0,
            system_uptime: Duration::from_secs(0),
            optimizations_performed: 0,
        }
    }
}

impl Default for PerformanceSummary {
    fn default() -> Self {
        Self {
            overall_performance_score: 1.0,
            bottleneck_count: 0,
            optimization_opportunities: 0,
            average_response_time: Duration::from_millis(100),
        }
    }
}

impl Default for SecurityStatusSummary {
    fn default() -> Self {
        Self {
            threat_level: "Low".to_string(),
            active_sessions: 0,
            failed_authentication_attempts: 0,
            security_events: 0,
        }
    }
}

impl Default for ResourceUtilizationSummary {
    fn default() -> Self {
        Self {
            cpu_utilization: 0.0,
            memory_utilization: 0.0,
            gpu_utilization: 0.0,
            storage_utilization: 0.0,
        }
    }
}

impl TaskPriority {
    fn from_u32(priority: u32) -> Self {
        match priority {
            0 => TaskPriority::Critical,
            1 => TaskPriority::High,
            2 => TaskPriority::Medium,
            _ => TaskPriority::Low,
        }
    }
}

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

    #[test]
    fn test_integrated_engine_creation() {
        let config = IntegratedExecutionConfig::default();
        let engine = IntegratedOptimizationExecutionEngine::new(config);
        assert!(engine.is_ok());
    }

    #[test]
    fn test_engine_state_initialization() {
        let state = IntegratedEngineState::new();
        assert_eq!(state.status, EngineStatus::Uninitialized);
        assert_eq!(state.active_task_count, 0);
        assert_eq!(state.system_health_score, 1.0);
    }

    #[test]
    fn test_execution_statistics_initialization() {
        let stats = ExecutionStatistics::new();
        assert_eq!(stats.total_tasks_executed, 0);
        assert_eq!(stats.successful_tasks, 0);
        assert_eq!(stats.failed_tasks, 0);
    }

    #[test]
    fn test_compatibility_configuration() {
        let compat_config = LegacyCompatibilityConfig::default();
        assert!(compat_config.enable_legacy_api);
        assert!(compat_config.support_legacy_tasks);
        assert_eq!(compat_config.compatibility_level, CompatibilityLevel::Partial);
    }

    #[test]
    fn test_task_priority_conversion() {
        assert_eq!(TaskPriority::from_u32(0), TaskPriority::Critical);
        assert_eq!(TaskPriority::from_u32(1), TaskPriority::High);
        assert_eq!(TaskPriority::from_u32(2), TaskPriority::Medium);
        assert_eq!(TaskPriority::from_u32(99), TaskPriority::Low);
    }

    #[tokio::test]
    async fn test_engine_initialization() {
        let config = IntegratedExecutionConfig::default();
        let engine = IntegratedOptimizationExecutionEngine::new(config).unwrap();

        // Note: This test would require proper initialization of all components
        // For now, we test the interface exists
        let status = engine.get_system_status();
        assert_eq!(status.engine_status, EngineStatus::Uninitialized);
    }

    #[test]
    fn test_optimization_task_creation() {
        let mut parameters = HashMap::new();
        parameters.insert("batch_size".to_string(), "32".to_string());
        parameters.insert("learning_rate".to_string(), "0.01".to_string());

        let task = OptimizationTask {
            task_id: "test_task_001".to_string(),
            task_type: "gradient_descent".to_string(),
            parameters,
            priority: 1,
            timeout: Some(Duration::from_secs(300)),
            dependencies: vec![],
            created_at: SystemTime::now(),
            scheduled_at: None,
        };

        assert_eq!(task.task_id, "test_task_001");
        assert_eq!(task.task_type, "gradient_descent");
        assert_eq!(task.priority, 1);
        assert_eq!(task.parameters.len(), 2);
    }

    #[test]
    fn test_execution_result_creation() {
        let mut optimization_results = HashMap::new();
        optimization_results.insert("loss".to_string(), 0.123);
        optimization_results.insert("accuracy".to_string(), 0.876);

        let result = ExecutionResult {
            optimization_results,
            performance_metrics: HashMap::new(),
            resource_usage: HashMap::new(),
            quality_score: 0.85,
        };

        assert_eq!(result.quality_score, 0.85);
        assert_eq!(result.optimization_results.len(), 2);
        assert!(result.optimization_results.contains_key("loss"));
        assert!(result.optimization_results.contains_key("accuracy"));
    }
}