// eBPF module - currently stub implementation for Linux
// Most functionality not yet implemented

#[cfg(target_os = "linux")]
use crate::ProcessInfo;
#[cfg(target_os = "linux")]
use std::collections::HashMap;
#[cfg(target_os = "linux")]
use std::sync::{Arc, Mutex};
#[cfg(target_os = "linux")]
use std::time::{Duration, SystemTime};

/// Linux eBPF-based Process Injection Detection
/// Provides kernel-level tracing and detection capabilities on Linux systems
#[cfg(target_os = "linux")]
pub struct EbpfDetector {
    program_manager: EbpfProgramManager,
    event_processor: EbpfEventProcessor,
    filter_manager: EbpfFilterManager,
    ring_buffer: Arc<Mutex<EbpfRingBuffer>>,
}

#[cfg(target_os = "linux")]
impl std::fmt::Debug for EbpfDetector {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("EbpfDetector")
            .field("program_manager", &self.program_manager)
            .field("event_processor", &"<EbpfEventProcessor>")
            .field("filter_manager", &self.filter_manager)
            .field("ring_buffer", &"<Arc<Mutex<EbpfRingBuffer>>>")
            .finish()
    }
}

#[cfg(target_os = "linux")]
#[derive(Debug)]
pub struct EbpfProgramManager {
    loaded_programs: HashMap<String, LoadedProgram>,
    program_definitions: Vec<EbpfProgramDefinition>,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct LoadedProgram {
    pub program_id: u32,
    pub program_type: EbpfProgramType,
    pub attach_point: String,
    pub fd: i32,
    pub loaded_at: SystemTime,
    pub event_count: u64,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum EbpfProgramType {
    Kprobe,
    Kretprobe,
    Tracepoint,
    Uprobe,
    Uretprobe,
    PerfEvent,
    SocketFilter,
    SchedCls,
    SchedAct,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct EbpfProgramDefinition {
    pub name: String,
    pub program_type: EbpfProgramType,
    pub attach_points: Vec<String>,
    pub bytecode: Vec<u8>,
    pub description: String,
    pub enabled: bool,
}

#[cfg(target_os = "linux")]
pub struct EbpfEventProcessor {
    event_handlers: HashMap<EventType, Box<dyn EventHandler>>,
    detection_rules: Vec<EbpfDetectionRule>,
    process_tracker: ProcessTracker,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub enum EventType {
    ProcessCreate,
    ProcessExit,
    MemoryMap,
    MemoryUnmap,
    MemoryProtect,
    FileOpen,
    FileClose,
    NetworkConnect,
    NetworkAccept,
    SyscallEntry,
    SyscallExit,
    ThreadCreate,
    ThreadExit,
    ProcessInjection,
}

#[cfg(target_os = "linux")]
pub trait EventHandler: Send + Sync {
    fn handle_event(&mut self, event: &EbpfEvent) -> Option<DetectionEvent>;
    fn get_event_type(&self) -> EventType;
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct EbpfEvent {
    pub timestamp: u64,
    pub pid: u32,
    pub tid: u32,
    pub event_type: EventType,
    pub data: EbpfEventData,
    pub cpu: u32,
    pub comm: String,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum EbpfEventData {
    ProcessCreate(ProcessCreateData),
    ProcessExit(ProcessExitData),
    MemoryMap(MemoryMapData),
    MemoryProtect(MemoryProtectData),
    FileAccess(FileAccessData),
    NetworkActivity(NetworkActivityData),
    Syscall(SyscallData),
    ProcessInjection(ProcessInjectionData),
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct ProcessCreateData {
    pub parent_pid: u32,
    pub filename: String,
    pub argv: Vec<String>,
    pub envp: Vec<String>,
    pub uid: u32,
    pub gid: u32,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct ProcessExitData {
    pub exit_code: i32,
    pub exit_signal: i32,
    pub runtime_ms: u64,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct MemoryMapData {
    pub address: u64,
    pub length: u64,
    pub protection: u32,
    pub flags: u32,
    pub fd: i32,
    pub offset: u64,
    pub filename: Option<String>,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct MemoryProtectData {
    pub address: u64,
    pub length: u64,
    pub old_protection: u32,
    pub new_protection: u32,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct FileAccessData {
    pub filename: String,
    pub flags: u32,
    pub mode: u32,
    pub fd: i32,
    pub operation: FileOperation,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum FileOperation {
    Open,
    Close,
    Read,
    Write,
    Seek,
    Truncate,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct NetworkActivityData {
    pub local_addr: String,
    pub local_port: u16,
    pub remote_addr: String,
    pub remote_port: u16,
    pub protocol: NetworkProtocol,
    pub operation: NetworkOperation,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum NetworkProtocol {
    TCP,
    UDP,
    ICMP,
    RAW,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum NetworkOperation {
    Connect,
    Accept,
    Send,
    Receive,
    Close,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct SyscallData {
    pub syscall_number: u64,
    pub syscall_name: String,
    pub args: Vec<u64>,
    pub return_value: i64,
    pub duration_ns: u64,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct ProcessInjectionData {
    pub target_pid: u32,
    pub injection_type: InjectionType,
    pub memory_address: u64,
    pub memory_size: u64,
    pub source_process: u32,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum InjectionType {
    PtraceInject,
    ProcMemInject,
    SharedLibraryInject,
    ElfInjection,
    ShellcodeInject,
    CodeCaveInject,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct DetectionEvent {
    pub timestamp: SystemTime,
    pub event_id: String,
    pub detection_type: DetectionType,
    pub confidence: f32,
    pub severity: EventSeverity,
    pub process_info: ProcessInfo,
    pub indicators: Vec<String>,
    pub raw_events: Vec<EbpfEvent>,
    pub context: DetectionContext,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum DetectionType {
    ProcessHollowing,
    DllInjection,
    ShellcodeInjection,
    PtraceInjection,
    ProcessDoppelganging,
    AtomBombing,
    ProcessGhosting,
    ManualDllLoading,
    ReflectiveDllLoading,
    ProcessOverwriting,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum EventSeverity {
    Info,
    Low,
    Medium,
    High,
    Critical,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct DetectionContext {
    pub mitre_technique: String,
    pub attack_chain: Vec<String>,
    pub affected_processes: Vec<u32>,
    pub network_connections: Vec<String>,
    pub file_modifications: Vec<String>,
    pub privilege_escalations: Vec<String>,
}

#[cfg(target_os = "linux")]
#[derive(Debug)]
pub struct EbpfDetectionRule {
    pub rule_id: String,
    pub name: String,
    pub description: String,
    pub conditions: Vec<DetectionCondition>,
    pub confidence_weight: f32,
    pub severity: EventSeverity,
    pub mitre_technique: String,
    pub enabled: bool,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum DetectionCondition {
    EventSequence {
        events: Vec<EventType>,
        time_window: Duration,
        same_process: bool,
    },
    MemoryPattern {
        pattern: MemoryPatternType,
        threshold: f32,
    },
    ProcessBehavior {
        behavior: ProcessBehaviorType,
        threshold: u32,
    },
    FileSystemActivity {
        pattern: FileSystemPattern,
        suspicious_paths: Vec<String>,
    },
    NetworkActivity {
        pattern: NetworkPattern,
        suspicious_destinations: Vec<String>,
    },
    SyscallPattern {
        syscalls: Vec<String>,
        frequency_threshold: u32,
        time_window: Duration,
    },
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum MemoryPatternType {
    RWXAllocation,
    ExecutableMapping,
    SuspiciousProtectionChange,
    LargeAllocation,
    PatternMatching(Vec<u8>),
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum ProcessBehaviorType {
    RapidProcessCreation,
    UnusualParentChild,
    PrivilegeEscalation,
    ProcessMasquerading,
    HollowedProcess,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum FileSystemPattern {
    TemporaryFileCreation,
    ExecutableModification,
    SystemFileAccess,
    HiddenFileCreation,
    ConfigurationModification,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum NetworkPattern {
    UnusualOutboundConnection,
    CommandControlCommunication,
    DataExfiltration,
    LateralMovement,
    TunneledTraffic,
}

#[cfg(target_os = "linux")]
#[derive(Debug)]
pub struct ProcessTracker {
    processes: HashMap<u32, TrackedProcess>,
    process_tree: HashMap<u32, Vec<u32>>,
    injection_timeline: Vec<InjectionEvent>,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct TrackedProcess {
    pub pid: u32,
    pub ppid: u32,
    pub command: String,
    pub start_time: SystemTime,
    pub memory_maps: Vec<MemoryMapData>,
    pub file_operations: Vec<FileAccessData>,
    pub network_connections: Vec<NetworkActivityData>,
    pub syscall_history: Vec<SyscallData>,
    pub injection_indicators: Vec<InjectionIndicator>,
    pub suspicious_score: f32,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct InjectionEvent {
    pub timestamp: SystemTime,
    pub source_pid: u32,
    pub target_pid: u32,
    pub injection_type: InjectionType,
    pub indicators: Vec<String>,
    pub confidence: f32,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct InjectionIndicator {
    pub indicator_type: IndicatorType,
    pub description: String,
    pub confidence: f32,
    pub timestamp: SystemTime,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum IndicatorType {
    SuspiciousMemoryOperation,
    UnusualSyscallSequence,
    ProcessTreeAnomaly,
    FileSystemModification,
    NetworkCommunication,
    PrivilegeOperation,
}

#[cfg(target_os = "linux")]
#[derive(Debug)]
pub struct EbpfFilterManager {
    active_filters: HashMap<String, EbpfFilter>,
    filter_statistics: HashMap<String, FilterStats>,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct EbpfFilter {
    pub filter_id: String,
    pub name: String,
    pub description: String,
    pub event_types: Vec<EventType>,
    pub conditions: Vec<FilterCondition>,
    pub action: FilterAction,
    pub enabled: bool,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum FilterCondition {
    ProcessName(String),
    ProcessId(u32),
    UserId(u32),
    EventFrequency {
        max_events: u32,
        time_window: Duration,
    },
    MemoryThreshold(u64),
    FilePattern(String),
    NetworkDestination(String),
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub enum FilterAction {
    Allow,
    Block,
    Monitor,
    Alert,
    Quarantine,
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct FilterStats {
    pub events_processed: u64,
    pub events_filtered: u64,
    pub last_update: SystemTime,
    pub performance_impact: f32,
}

#[cfg(target_os = "linux")]
#[derive(Debug)]
pub struct EbpfRingBuffer {
    buffer: Vec<EbpfEvent>,
    read_index: usize,
    write_index: usize,
    capacity: usize,
    lost_events: u64,
}

#[cfg(target_os = "linux")]
impl EbpfDetector {
    pub fn new() -> Result<Self, EbpfError> {
        let program_manager = EbpfProgramManager::new()?;
        let event_processor = EbpfEventProcessor::new();
        let filter_manager = EbpfFilterManager::new();
        let ring_buffer = Arc::new(Mutex::new(EbpfRingBuffer::new(1024 * 1024))); // 1MB buffer

        Ok(Self {
            program_manager,
            event_processor,
            filter_manager,
            ring_buffer,
        })
    }

    /// Initialize eBPF programs for process injection detection
    pub fn initialize(&mut self) -> Result<(), EbpfError> {
        // Load core detection programs
        self.load_process_monitoring_programs()?;
        self.load_memory_monitoring_programs()?;
        self.load_injection_detection_programs()?;
        self.load_syscall_monitoring_programs()?;

        // Set up event processing
        self.setup_event_handlers()?;

        // Configure default filters
        self.setup_default_filters()?;

        Ok(())
    }

    /// Load eBPF programs for process monitoring
    fn load_process_monitoring_programs(&mut self) -> Result<(), EbpfError> {
        // Process creation monitoring
        let process_create_program = EbpfProgramDefinition {
            name: "process_create_monitor".to_string(),
            program_type: EbpfProgramType::Tracepoint,
            attach_points: vec!["sched:sched_process_fork".to_string()],
            bytecode: self.compile_process_create_program()?,
            description: "Monitor process creation events".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(process_create_program)?;

        // Process exit monitoring
        let process_exit_program = EbpfProgramDefinition {
            name: "process_exit_monitor".to_string(),
            program_type: EbpfProgramType::Tracepoint,
            attach_points: vec!["sched:sched_process_exit".to_string()],
            bytecode: self.compile_process_exit_program()?,
            description: "Monitor process exit events".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(process_exit_program)?;

        Ok(())
    }

    /// Load eBPF programs for memory monitoring
    fn load_memory_monitoring_programs(&mut self) -> Result<(), EbpfError> {
        // Memory mapping monitoring
        let mmap_program = EbpfProgramDefinition {
            name: "memory_map_monitor".to_string(),
            program_type: EbpfProgramType::Kprobe,
            attach_points: vec!["sys_mmap".to_string(), "sys_mmap2".to_string()],
            bytecode: self.compile_mmap_program()?,
            description: "Monitor memory mapping operations".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(mmap_program)?;

        // Memory protection monitoring
        let mprotect_program = EbpfProgramDefinition {
            name: "memory_protect_monitor".to_string(),
            program_type: EbpfProgramType::Kprobe,
            attach_points: vec!["sys_mprotect".to_string()],
            bytecode: self.compile_mprotect_program()?,
            description: "Monitor memory protection changes".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(mprotect_program)?;

        Ok(())
    }

    /// Load eBPF programs for injection detection
    fn load_injection_detection_programs(&mut self) -> Result<(), EbpfError> {
        // Ptrace monitoring for injection detection
        let ptrace_program = EbpfProgramDefinition {
            name: "ptrace_injection_monitor".to_string(),
            program_type: EbpfProgramType::Kprobe,
            attach_points: vec!["sys_ptrace".to_string()],
            bytecode: self.compile_ptrace_program()?,
            description: "Monitor ptrace operations for injection".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(ptrace_program)?;

        // Process memory access monitoring
        let proc_mem_program = EbpfProgramDefinition {
            name: "proc_mem_monitor".to_string(),
            program_type: EbpfProgramType::Kprobe,
            attach_points: vec!["vfs_read".to_string(), "vfs_write".to_string()],
            bytecode: self.compile_proc_mem_program()?,
            description: "Monitor /proc/[pid]/mem access".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(proc_mem_program)?;

        Ok(())
    }

    /// Load eBPF programs for syscall monitoring
    fn load_syscall_monitoring_programs(&mut self) -> Result<(), EbpfError> {
        // General syscall monitoring
        let syscall_program = EbpfProgramDefinition {
            name: "syscall_monitor".to_string(),
            program_type: EbpfProgramType::Tracepoint,
            attach_points: vec![
                "raw_syscalls:sys_enter".to_string(),
                "raw_syscalls:sys_exit".to_string(),
            ],
            bytecode: self.compile_syscall_program()?,
            description: "Monitor suspicious syscall patterns".to_string(),
            enabled: true,
        };

        self.program_manager.load_program(syscall_program)?;

        Ok(())
    }

    /// Set up event handlers for different event types
    fn setup_event_handlers(&mut self) -> Result<(), EbpfError> {
        self.event_processor.register_handler(
            EventType::ProcessCreate,
            Box::new(ProcessCreateHandler::new()),
        );

        self.event_processor
            .register_handler(EventType::MemoryMap, Box::new(MemoryMapHandler::new()));

        self.event_processor.register_handler(
            EventType::MemoryProtect,
            Box::new(MemoryProtectHandler::new()),
        );

        self.event_processor.register_handler(
            EventType::ProcessInjection,
            Box::new(InjectionHandler::new()),
        );

        Ok(())
    }

    /// Configure default filters to reduce noise
    fn setup_default_filters(&mut self) -> Result<(), EbpfError> {
        // Filter out common system processes
        let system_filter = EbpfFilter {
            filter_id: "system_processes".to_string(),
            name: "System Process Filter".to_string(),
            description: "Filter out common system processes".to_string(),
            event_types: vec![EventType::ProcessCreate, EventType::MemoryMap],
            conditions: vec![
                FilterCondition::ProcessName("kthreadd".to_string()),
                FilterCondition::ProcessName("ksoftirqd".to_string()),
                FilterCondition::ProcessName("migration".to_string()),
            ],
            action: FilterAction::Allow,
            enabled: true,
        };

        self.filter_manager.add_filter(system_filter);

        // High-frequency event throttling
        let frequency_filter = EbpfFilter {
            filter_id: "frequency_limit".to_string(),
            name: "Event Frequency Limiter".to_string(),
            description: "Limit high-frequency events".to_string(),
            event_types: vec![EventType::SyscallEntry, EventType::SyscallExit],
            conditions: vec![FilterCondition::EventFrequency {
                max_events: 1000,
                time_window: Duration::from_secs(1),
            }],
            action: FilterAction::Monitor,
            enabled: true,
        };

        self.filter_manager.add_filter(frequency_filter);

        Ok(())
    }

    /// Process events from the ring buffer
    pub fn process_events(&mut self) -> Result<Vec<DetectionEvent>, EbpfError> {
        let mut detection_events = Vec::new();

        let events = {
            let mut buffer = self.ring_buffer.lock().unwrap();
            buffer.drain_events()
        };

        for event in events {
            // Apply filters
            if self.filter_manager.should_process(&event) {
                // Process event through detection rules
                if let Some(detection) = self.event_processor.process_event(event) {
                    detection_events.push(detection);
                }
            }
        }

        Ok(detection_events)
    }

    /// Compile eBPF bytecode for process creation monitoring
    fn compile_process_create_program(&self) -> Result<Vec<u8>, EbpfError> {
        // In a real implementation, this would compile eBPF C code
        // For now, return placeholder bytecode
        Ok(vec![0; 512]) // Placeholder
    }

    /// Compile eBPF bytecode for process exit monitoring
    fn compile_process_exit_program(&self) -> Result<Vec<u8>, EbpfError> {
        Ok(vec![0; 512]) // Placeholder
    }

    /// Compile eBPF bytecode for memory mapping monitoring
    fn compile_mmap_program(&self) -> Result<Vec<u8>, EbpfError> {
        Ok(vec![0; 1024]) // Placeholder
    }

    /// Compile eBPF bytecode for memory protection monitoring
    fn compile_mprotect_program(&self) -> Result<Vec<u8>, EbpfError> {
        Ok(vec![0; 1024]) // Placeholder
    }

    /// Compile eBPF bytecode for ptrace monitoring
    fn compile_ptrace_program(&self) -> Result<Vec<u8>, EbpfError> {
        Ok(vec![0; 1024]) // Placeholder
    }

    /// Compile eBPF bytecode for /proc/mem monitoring
    fn compile_proc_mem_program(&self) -> Result<Vec<u8>, EbpfError> {
        Ok(vec![0; 1024]) // Placeholder
    }

    /// Compile eBPF bytecode for syscall monitoring
    fn compile_syscall_program(&self) -> Result<Vec<u8>, EbpfError> {
        Ok(vec![0; 2048]) // Placeholder
    }

    /// Get detection statistics
    pub fn get_statistics(&self) -> EbpfStatistics {
        EbpfStatistics {
            loaded_programs: self.program_manager.loaded_programs.len(),
            total_events_processed: 0, // Would be tracked in real implementation
            detections_generated: 0,   // Would be tracked in real implementation
            filter_efficiency: 0.0,    // Would be calculated in real implementation
            performance_impact: 0.0,   // Would be measured in real implementation
        }
    }
}

#[cfg(target_os = "linux")]
#[derive(Debug, Clone)]
pub struct EbpfStatistics {
    pub loaded_programs: usize,
    pub total_events_processed: u64,
    pub detections_generated: u64,
    pub filter_efficiency: f32,
    pub performance_impact: f32,
}

#[cfg(target_os = "linux")]
#[derive(Debug, thiserror::Error)]
pub enum EbpfError {
    #[error("Failed to load eBPF program: {0}")]
    ProgramLoadError(String),
    #[error("Failed to attach eBPF program: {0}")]
    AttachError(String),
    #[error("Event processing error: {0}")]
    EventProcessingError(String),
    #[error("Compilation error: {0}")]
    CompilationError(String),
    #[error("Permission denied: {0}")]
    PermissionError(String),
    #[error("Kernel version not supported: {0}")]
    KernelVersionError(String),
}

// Placeholder implementations for handlers
#[cfg(target_os = "linux")]
pub struct ProcessCreateHandler;

#[cfg(target_os = "linux")]
impl ProcessCreateHandler {
    pub fn new() -> Self {
        Self
    }
}

#[cfg(target_os = "linux")]
impl EventHandler for ProcessCreateHandler {
    fn handle_event(&mut self, _event: &EbpfEvent) -> Option<DetectionEvent> {
        // Process creation event handling logic
        None
    }

    fn get_event_type(&self) -> EventType {
        EventType::ProcessCreate
    }
}

#[cfg(target_os = "linux")]
pub struct MemoryMapHandler;

#[cfg(target_os = "linux")]
impl MemoryMapHandler {
    pub fn new() -> Self {
        Self
    }
}

#[cfg(target_os = "linux")]
impl EventHandler for MemoryMapHandler {
    fn handle_event(&mut self, _event: &EbpfEvent) -> Option<DetectionEvent> {
        // Memory mapping event handling logic
        None
    }

    fn get_event_type(&self) -> EventType {
        EventType::MemoryMap
    }
}

#[cfg(target_os = "linux")]
pub struct MemoryProtectHandler;

#[cfg(target_os = "linux")]
impl MemoryProtectHandler {
    pub fn new() -> Self {
        Self
    }
}

#[cfg(target_os = "linux")]
impl EventHandler for MemoryProtectHandler {
    fn handle_event(&mut self, _event: &EbpfEvent) -> Option<DetectionEvent> {
        // Memory protection change event handling logic
        None
    }

    fn get_event_type(&self) -> EventType {
        EventType::MemoryProtect
    }
}

#[cfg(target_os = "linux")]
pub struct InjectionHandler;

#[cfg(target_os = "linux")]
impl InjectionHandler {
    pub fn new() -> Self {
        Self
    }
}

#[cfg(target_os = "linux")]
impl EventHandler for InjectionHandler {
    fn handle_event(&mut self, _event: &EbpfEvent) -> Option<DetectionEvent> {
        // Process injection event handling logic
        None
    }

    fn get_event_type(&self) -> EventType {
        EventType::ProcessInjection
    }
}

// Placeholder implementations for managers
#[cfg(target_os = "linux")]
impl EbpfProgramManager {
    pub fn new() -> Result<Self, EbpfError> {
        Ok(Self {
            loaded_programs: HashMap::new(),
            program_definitions: Vec::new(),
        })
    }

    pub fn load_program(&mut self, program: EbpfProgramDefinition) -> Result<(), EbpfError> {
        // eBPF program loading logic
        println!("Loading eBPF program: {}", program.name);
        Ok(())
    }
}

#[cfg(target_os = "linux")]
impl EbpfEventProcessor {
    pub fn new() -> Self {
        Self {
            event_handlers: HashMap::new(),
            detection_rules: Vec::new(),
            process_tracker: ProcessTracker::new(),
        }
    }

    pub fn register_handler(&mut self, event_type: EventType, handler: Box<dyn EventHandler>) {
        self.event_handlers.insert(event_type, handler);
    }

    pub fn process_event(&mut self, _event: EbpfEvent) -> Option<DetectionEvent> {
        // Event processing logic
        None
    }
}

#[cfg(target_os = "linux")]
impl ProcessTracker {
    pub fn new() -> Self {
        Self {
            processes: HashMap::new(),
            process_tree: HashMap::new(),
            injection_timeline: Vec::new(),
        }
    }
}

#[cfg(target_os = "linux")]
impl EbpfFilterManager {
    pub fn new() -> Self {
        Self {
            active_filters: HashMap::new(),
            filter_statistics: HashMap::new(),
        }
    }

    pub fn add_filter(&mut self, filter: EbpfFilter) {
        self.active_filters.insert(filter.filter_id.clone(), filter);
    }

    pub fn should_process(&self, _event: &EbpfEvent) -> bool {
        // Filter evaluation logic
        true
    }
}

#[cfg(target_os = "linux")]
impl EbpfRingBuffer {
    pub fn new(capacity: usize) -> Self {
        Self {
            buffer: Vec::with_capacity(capacity),
            read_index: 0,
            write_index: 0,
            capacity,
            lost_events: 0,
        }
    }

    pub fn drain_events(&mut self) -> Vec<EbpfEvent> {
        // Drain events from ring buffer
        Vec::new()
    }
}

// For non-Linux systems, provide a stub implementation
#[cfg(not(target_os = "linux"))]
pub struct EbpfDetector;

#[cfg(not(target_os = "linux"))]
impl EbpfDetector {
    pub fn new() -> Result<Self, &'static str> {
        Err("eBPF detection is only supported on Linux")
    }

    pub fn initialize(&mut self) -> Result<(), &'static str> {
        Err("eBPF detection is only supported on Linux")
    }
}