quantrs2-anneal 0.1.3

//! Test execution engine and execution management

use std::collections::{HashMap, VecDeque};
use std::thread;
use std::time::SystemTime;

use super::results::IntegrationTestResult;
use super::scenarios::IntegrationTestCase;

/// Test execution engine
pub struct TestExecutionEngine {
    /// Execution queue
    pub execution_queue: VecDeque<TestExecutionRequest>,
    /// Active executions
    pub active_executions: HashMap<String, ActiveTestExecution>,
    /// Execution history
    pub execution_history: VecDeque<TestExecutionResult>,
    /// Resource monitor
    pub resource_monitor: ResourceMonitor,
}

impl TestExecutionEngine {
    #[must_use]
    pub fn new() -> Self {
        Self {
            execution_queue: VecDeque::new(),
            active_executions: HashMap::new(),
            execution_history: VecDeque::new(),
            resource_monitor: ResourceMonitor::new(),
        }
    }

    /// Queue a test execution request
    pub fn queue_test(&mut self, request: TestExecutionRequest) -> Result<String, String> {
        let id = request.id.clone();
        self.execution_queue.push_back(request);
        Ok(id)
    }

    /// Execute a test request
    pub fn execute_test(
        &mut self,
        request: TestExecutionRequest,
    ) -> Result<TestExecutionResult, String> {
        let execution_id = request.id.clone();
        let test_case_id = request.test_case.id;
        let start_time = SystemTime::now();

        // Create test result with default values
        let test_result = IntegrationTestResult {
            test_case_id: test_case_id.clone(),
            timestamp: start_time,
            outcome: super::results::TestOutcome::Passed,
            performance_metrics: super::results::PerformanceMetrics {
                execution_duration: std::time::Duration::from_secs(0),
                setup_duration: std::time::Duration::from_secs(0),
                cleanup_duration: std::time::Duration::from_secs(0),
                peak_memory_usage: 0,
                avg_cpu_usage: 0.0,
                custom_metrics: HashMap::new(),
            },
            validation_results: super::results::ValidationResults {
                status: super::results::ValidationStatus::Passed,
                validations: Vec::new(),
                summary: super::results::ValidationSummary {
                    total: 0,
                    passed: 0,
                    failed: 0,
                    skipped: 0,
                },
            },
            error_info: None,
            artifacts: Vec::new(),
        };

        let end_time = SystemTime::now();

        let result = TestExecutionResult {
            execution_id,
            test_case_id,
            status: ExecutionStatus::Success,
            start_time,
            end_time,
            result: test_result,
            metadata: HashMap::new(),
        };

        // Add to history
        self.execution_history.push_back(result.clone());

        Ok(result)
    }

    /// Get execution status
    #[must_use]
    pub fn get_execution_status(&self, execution_id: &str) -> Option<&ActiveTestExecution> {
        self.active_executions.get(execution_id)
    }

    /// Cancel a running execution
    pub fn cancel_execution(&mut self, execution_id: &str) -> Result<(), String> {
        if self.active_executions.remove(execution_id).is_some() {
            Ok(())
        } else {
            Err(format!("Execution {execution_id} not found"))
        }
    }

    /// Get execution history
    #[must_use]
    pub const fn get_execution_history(&self) -> &VecDeque<TestExecutionResult> {
        &self.execution_history
    }

    /// Get current queue size
    #[must_use]
    pub fn queue_size(&self) -> usize {
        self.execution_queue.len()
    }

    /// Get active execution count
    #[must_use]
    pub fn active_execution_count(&self) -> usize {
        self.active_executions.len()
    }

    /// Process next test in queue
    pub fn process_next(&mut self) -> Result<Option<TestExecutionResult>, String> {
        if let Some(request) = self.execution_queue.pop_front() {
            Ok(Some(self.execute_test(request)?))
        } else {
            Ok(None)
        }
    }

    /// Clear execution history
    pub fn clear_history(&mut self) {
        self.execution_history.clear();
    }

    /// Update resource usage
    pub fn update_resource_usage(&mut self, usage: ResourceUsage) {
        self.resource_monitor.current_usage = usage.clone();
        self.resource_monitor
            .usage_history
            .push_back(ResourceUsageSnapshot {
                timestamp: SystemTime::now(),
                usage,
                active_tests: self.active_executions.len(),
            });

        // Keep only last 1000 snapshots
        while self.resource_monitor.usage_history.len() > 1000 {
            self.resource_monitor.usage_history.pop_front();
        }
    }

    /// Check if resources are available for new test
    #[must_use]
    pub const fn has_available_resources(&self, allocation: &ResourceAllocation) -> bool {
        let limits = &self.resource_monitor.limits;
        let current = &self.resource_monitor.current_usage;

        current.memory_usage + allocation.memory_bytes <= limits.max_memory_usage
            && current.disk_usage + allocation.disk_bytes <= limits.max_disk_usage
            && current.thread_count + 1 <= limits.max_threads
    }
}

/// Test execution request
#[derive(Debug, Clone)]
pub struct TestExecutionRequest {
    /// Request identifier
    pub id: String,
    /// Test case to execute
    pub test_case: IntegrationTestCase,
    /// Execution priority
    pub priority: super::scenarios::TestPriority,
    /// Requested execution time
    pub requested_time: SystemTime,
    /// Execution context
    pub context: ExecutionContext,
}

/// Execution context
#[derive(Debug, Clone)]
pub struct ExecutionContext {
    /// Context parameters
    pub parameters: HashMap<String, String>,
    /// Environment variables
    pub environment: HashMap<String, String>,
    /// Resource allocation
    pub resources: ResourceAllocation,
    /// Execution metadata
    pub metadata: HashMap<String, String>,
}

/// Active test execution tracking
#[derive(Debug)]
pub struct ActiveTestExecution {
    /// Execution request
    pub request: TestExecutionRequest,
    /// Start time
    pub start_time: SystemTime,
    /// Current step
    pub current_step: usize,
    /// Execution thread handle
    pub thread_handle: Option<thread::JoinHandle<TestExecutionResult>>,
    /// Progress tracker
    pub progress: ExecutionProgress,
}

/// Execution progress tracking
#[derive(Debug, Clone)]
pub struct ExecutionProgress {
    /// Completed steps
    pub completed_steps: usize,
    /// Total steps
    pub total_steps: usize,
    /// Progress percentage
    pub percentage: f64,
    /// Current status
    pub status: TestStatus,
    /// Estimated completion time
    pub estimated_completion: Option<SystemTime>,
}

/// Test execution status
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TestStatus {
    Queued,
    Running,
    Completed,
    Failed,
    Cancelled,
    Timeout,
}

/// Test execution result
#[derive(Debug, Clone)]
pub struct TestExecutionResult {
    /// Execution ID
    pub execution_id: String,
    /// Test case ID
    pub test_case_id: String,
    /// Execution status
    pub status: ExecutionStatus,
    /// Start time
    pub start_time: SystemTime,
    /// End time
    pub end_time: SystemTime,
    /// Test result
    pub result: IntegrationTestResult,
    /// Execution metadata
    pub metadata: HashMap<String, String>,
}

/// Execution status
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ExecutionStatus {
    Success,
    Failure(String),
    Timeout,
    Cancelled,
    Error(String),
}

/// Resource allocation for test execution
#[derive(Debug, Clone)]
pub struct ResourceAllocation {
    /// CPU allocation
    pub cpu_cores: usize,
    /// Memory allocation (bytes)
    pub memory_bytes: usize,
    /// Disk allocation (bytes)
    pub disk_bytes: usize,
    /// Network bandwidth (bytes/sec)
    pub network_bandwidth: Option<usize>,
}

/// Resource monitoring system
#[derive(Debug)]
pub struct ResourceMonitor {
    /// Current resource usage
    pub current_usage: ResourceUsage,
    /// Usage history
    pub usage_history: VecDeque<ResourceUsageSnapshot>,
    /// Resource limits
    pub limits: ResourceLimits,
    /// Alert thresholds
    pub alert_thresholds: HashMap<String, f64>,
}

impl ResourceMonitor {
    #[must_use]
    pub fn new() -> Self {
        Self {
            current_usage: ResourceUsage::default(),
            usage_history: VecDeque::new(),
            limits: ResourceLimits::default(),
            alert_thresholds: HashMap::new(),
        }
    }
}

/// Current resource usage
#[derive(Debug, Clone)]
pub struct ResourceUsage {
    /// CPU usage percentage
    pub cpu_usage: f64,
    /// Memory usage in MB
    pub memory_usage: usize,
    /// Network usage in MB/s
    pub network_usage: f64,
    /// Disk usage in MB
    pub disk_usage: usize,
    /// Active threads count
    pub thread_count: usize,
}

impl Default for ResourceUsage {
    fn default() -> Self {
        Self {
            cpu_usage: 0.0,
            memory_usage: 0,
            network_usage: 0.0,
            disk_usage: 0,
            thread_count: 0,
        }
    }
}

/// Resource usage snapshot
#[derive(Debug, Clone)]
pub struct ResourceUsageSnapshot {
    /// Snapshot timestamp
    pub timestamp: SystemTime,
    /// Resource usage at this time
    pub usage: ResourceUsage,
    /// Active test count
    pub active_tests: usize,
}

/// Resource limits
#[derive(Debug, Clone)]
pub struct ResourceLimits {
    /// Maximum CPU usage
    pub max_cpu_usage: f64,
    /// Maximum memory usage
    pub max_memory_usage: usize,
    /// Maximum network usage
    pub max_network_usage: f64,
    /// Maximum disk usage
    pub max_disk_usage: usize,
    /// Maximum thread count
    pub max_threads: usize,
}

impl Default for ResourceLimits {
    fn default() -> Self {
        Self {
            max_cpu_usage: 95.0,
            max_memory_usage: 8 * 1024 * 1024 * 1024, // 8 GB
            max_network_usage: 1000.0,                // 1 GB/s
            max_disk_usage: 100 * 1024 * 1024 * 1024, // 100 GB
            max_threads: 1000,
        }
    }
}