#![allow(dead_code)]

use crate::{MemoryProtection, MemoryRegion, ProcessInfo, ThreadInfo};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::{Duration, SystemTime};

/// Advanced Evasion Detection Module
/// Detects sophisticated anti-analysis and evasion techniques
#[derive(Debug)]
pub struct EvasionDetector {
    timing_analyzer: TimingAnalyzer,
    environment_checker: EnvironmentChecker,
    behavior_analyzer: BehaviorAnalyzer,
    obfuscation_detector: ObfuscationDetector,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EvasionResult {
    pub evasion_techniques: Vec<EvasionTechnique>,
    pub confidence: f32,
    pub sophistication_score: f32,
    pub anti_analysis_indicators: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EvasionTechnique {
    pub technique_name: String,
    pub mitre_id: String,
    pub description: String,
    pub confidence: f32,
    pub indicators: Vec<String>,
    pub severity: EvasionSeverity,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub enum EvasionSeverity {
    Low,      // Basic evasion attempts
    Medium,   // Moderate sophistication
    High,     // Advanced techniques
    Critical, // Nation-state level evasion
}

/// Timing-based evasion detection
#[derive(Debug)]
pub struct TimingAnalyzer {
    execution_timings: HashMap<u32, Vec<ExecutionTiming>>,
    sleep_patterns: HashMap<u32, Vec<SleepPattern>>,
}

#[derive(Debug, Clone)]
pub struct ExecutionTiming {
    pub start_time: SystemTime,
    pub duration: Duration,
    pub operation_type: OperationType,
}

#[derive(Debug, Clone)]
pub enum OperationType {
    MemoryAllocation,
    ProcessCreation,
    FileAccess,
    NetworkConnection,
    RegistryAccess,
}

#[derive(Debug, Clone)]
pub struct SleepPattern {
    pub timestamp: SystemTime,
    pub duration: Duration,
    pub context: SleepContext,
}

#[derive(Debug, Clone)]
pub enum SleepContext {
    BeforeInjection,
    AfterDetection,
    BetweenOperations,
    RandomDelay,
}

/// Environment-based evasion detection
#[derive(Debug)]
pub struct EnvironmentChecker {
    vm_indicators: Vec<VmIndicator>,
    debugger_checks: Vec<DebuggerCheck>,
    sandbox_signatures: Vec<SandboxSignature>,
}

#[derive(Debug, Clone)]
pub struct VmIndicator {
    pub indicator_type: VmIndicatorType,
    pub detection_method: String,
    pub confidence: f32,
}

#[derive(Debug, Clone)]
pub enum VmIndicatorType {
    ProcessName, // VM-related processes
    RegistryKey, // VM registry artifacts
    FilePath,    // VM file system artifacts
    HardwareId,  // VM hardware identifiers
    Timing,      // VM timing anomalies
}

#[derive(Debug, Clone)]
pub struct DebuggerCheck {
    pub check_type: DebuggerCheckType,
    pub detection_api: String,
    pub bypass_difficulty: BypassDifficulty,
}

#[derive(Debug, Clone)]
pub enum DebuggerCheckType {
    IsDebuggerPresent,
    CheckRemoteDebuggerPresent,
    NtQueryInformationProcess,
    OutputDebugString,
    SetUnhandledExceptionFilter,
    ThreadHideFromDebugger,
}

#[derive(Debug, Clone)]
pub enum BypassDifficulty {
    Trivial,   // Easy to bypass
    Moderate,  // Requires knowledge
    Difficult, // Advanced techniques needed
    Expert,    // Very sophisticated bypass required
}

#[derive(Debug, Clone)]
pub struct SandboxSignature {
    pub signature_name: String,
    pub detection_pattern: String,
    pub evasion_method: String,
}

/// Behavioral analysis for evasion detection
#[derive(Debug)]
pub struct BehaviorAnalyzer {
    api_hooking_detector: ApiHookingDetector,
    execution_flow_analyzer: ExecutionFlowAnalyzer,
    resource_usage_monitor: ResourceUsageMonitor,
}

#[derive(Debug, Clone)]
pub struct ApiHookingDetector {
    hooked_functions: HashMap<String, HookInfo>,
    inline_hooks: Vec<InlineHook>,
    iat_modifications: Vec<IatModification>,
}

#[derive(Debug, Clone)]
pub struct HookInfo {
    pub function_name: String,
    pub original_address: usize,
    pub hook_address: usize,
    pub hook_type: HookType,
    pub detected_at: SystemTime,
}

#[derive(Debug, Clone)]
pub enum HookType {
    InlineHook,
    IatHook,
    EatHook,
    SsdtHook,
    VtableHook,
}

#[derive(Debug, Clone)]
pub struct InlineHook {
    pub target_function: String,
    pub hook_bytes: Vec<u8>,
    pub original_bytes: Vec<u8>,
    pub hook_length: usize,
}

#[derive(Debug, Clone)]
pub struct IatModification {
    pub module_name: String,
    pub function_name: String,
    pub original_address: usize,
    pub modified_address: usize,
}

#[derive(Debug, Clone)]
pub struct ExecutionFlowAnalyzer {
    control_flow_integrity: ControlFlowIntegrity,
    return_address_verification: ReturnAddressVerification,
    stack_analysis: StackAnalysis,
}

#[derive(Debug, Clone)]
pub struct ControlFlowIntegrity {
    pub indirect_calls: Vec<IndirectCall>,
    pub rop_gadgets: Vec<RopGadget>,
    pub jop_gadgets: Vec<JopGadget>,
}

#[derive(Debug, Clone)]
pub struct IndirectCall {
    pub source_address: usize,
    pub target_address: usize,
    pub call_type: CallType,
    pub validation_result: ValidationResult,
}

#[derive(Debug, Clone)]
pub enum CallType {
    FunctionPointer,
    VirtualCall,
    ReturnAddress,
    ExceptionHandler,
}

#[derive(Debug, Clone)]
pub enum ValidationResult {
    Valid,
    Suspicious,
    Invalid,
    Bypassed,
}

#[derive(Debug, Clone)]
pub struct RopGadget {
    pub address: usize,
    pub instructions: String,
    pub gadget_type: GadgetType,
}

#[derive(Debug, Clone)]
pub struct JopGadget {
    pub address: usize,
    pub dispatch_instruction: String,
    pub gadget_chain: Vec<usize>,
}

#[derive(Debug, Clone)]
pub enum GadgetType {
    PopRet,
    MovRet,
    XchgRet,
    ArithmeticRet,
    Syscall,
}

#[derive(Debug, Clone)]
pub struct ReturnAddressVerification {
    pub shadow_stack: Vec<usize>,
    pub call_stack: Vec<StackFrame>,
    pub anomalies: Vec<StackAnomaly>,
}

#[derive(Debug, Clone)]
pub struct StackFrame {
    pub return_address: usize,
    pub frame_pointer: usize,
    pub function_name: Option<String>,
    pub validation_status: ValidationResult,
}

#[derive(Debug, Clone)]
pub struct StackAnomaly {
    pub anomaly_type: StackAnomalyType,
    pub detected_address: usize,
    pub expected_address: Option<usize>,
    pub confidence: f32,
}

#[derive(Debug, Clone)]
pub enum StackAnomalyType {
    ReturnAddressMismatch,
    StackPivot,
    BufferOverflow,
    StackSpraying,
    HeapSpraying,
}

#[derive(Debug, Clone)]
pub struct StackAnalysis {
    pub stack_regions: Vec<StackRegion>,
    pub guard_pages: Vec<GuardPage>,
    pub canary_values: Vec<StackCanary>,
}

#[derive(Debug, Clone)]
pub struct StackRegion {
    pub base_address: usize,
    pub size: usize,
    pub protection: MemoryProtection,
    pub usage_pattern: StackUsagePattern,
}

#[derive(Debug, Clone)]
pub enum StackUsagePattern {
    Normal,
    Excessive,
    Unusual,
    Malicious,
}

#[derive(Debug, Clone)]
pub struct GuardPage {
    pub address: usize,
    pub status: GuardPageStatus,
}

#[derive(Debug, Clone)]
pub enum GuardPageStatus {
    Intact,
    Bypassed,
    Removed,
    Modified,
}

#[derive(Debug, Clone)]
pub struct StackCanary {
    pub address: usize,
    pub original_value: u64,
    pub current_value: u64,
    pub integrity_status: CanaryStatus,
}

#[derive(Debug, Clone)]
pub enum CanaryStatus {
    Intact,
    Corrupted,
    Bypassed,
    Missing,
}

/// Resource usage monitoring for evasion detection
#[derive(Debug, Clone)]
pub struct ResourceUsageMonitor {
    pub cpu_usage: CpuUsagePattern,
    pub memory_usage: MemoryUsagePattern,
    pub network_usage: NetworkUsagePattern,
    pub file_system_usage: FileSystemUsagePattern,
}

#[derive(Debug, Clone)]
pub struct CpuUsagePattern {
    pub baseline_usage: f32,
    pub current_usage: f32,
    pub usage_spikes: Vec<UsageSpike>,
    pub idle_periods: Vec<IdlePeriod>,
}

#[derive(Debug, Clone)]
pub struct UsageSpike {
    pub timestamp: SystemTime,
    pub peak_usage: f32,
    pub duration: Duration,
    pub context: SpikeContext,
}

#[derive(Debug, Clone)]
pub enum SpikeContext {
    CryptographicOperation,
    Deobfuscation,
    AntiAnalysis,
    PayloadExecution,
    Unknown,
}

#[derive(Debug, Clone)]
pub struct IdlePeriod {
    pub start_time: SystemTime,
    pub duration: Duration,
    pub reason: IdleReason,
}

#[derive(Debug, Clone)]
pub enum IdleReason {
    DelayedExecution,
    EnvironmentChecking,
    WaitingForTrigger,
    Evasion,
    Normal,
}

#[derive(Debug, Clone)]
pub struct MemoryUsagePattern {
    pub allocation_patterns: Vec<AllocationPattern>,
    pub deallocation_patterns: Vec<DeallocationPattern>,
    pub fragmentation_level: f32,
    pub heap_spray_indicators: Vec<HeapSprayIndicator>,
}

#[derive(Debug, Clone)]
pub struct AllocationPattern {
    pub size: usize,
    pub frequency: u32,
    pub protection: MemoryProtection,
    pub purpose: AllocationPurpose,
}

#[derive(Debug, Clone)]
pub enum AllocationPurpose {
    NormalOperation,
    ShellcodeStorage,
    DataObfuscation,
    HeapSpraying,
    StackSpraying,
}

#[derive(Debug, Clone)]
pub struct DeallocationPattern {
    pub timing: DeallocationTiming,
    pub completeness: DeallocationCompleteness,
}

#[derive(Debug, Clone)]
pub enum DeallocationTiming {
    Immediate,
    Delayed,
    Never,
    Conditional,
}

#[derive(Debug, Clone)]
pub enum DeallocationCompleteness {
    Complete,
    Partial,
    Minimal,
    None,
}

#[derive(Debug, Clone)]
pub struct HeapSprayIndicator {
    pub spray_size: usize,
    pub spray_pattern: Vec<u8>,
    pub target_addresses: Vec<usize>,
    pub success_probability: f32,
}

#[derive(Debug, Clone)]
pub struct NetworkUsagePattern {
    pub connection_patterns: Vec<ConnectionPattern>,
    pub data_exfiltration: Vec<ExfiltrationIndicator>,
    pub command_control: Vec<C2Indicator>,
}

#[derive(Debug, Clone)]
pub struct ConnectionPattern {
    pub destination: String,
    pub port: u16,
    pub protocol: String,
    pub frequency: ConnectionFrequency,
    pub purpose: ConnectionPurpose,
}

#[derive(Debug, Clone)]
pub enum ConnectionFrequency {
    SingleConnection,
    Periodic,
    Burst,
    Continuous,
}

#[derive(Debug, Clone)]
pub enum ConnectionPurpose {
    CommandControl,
    DataExfiltration,
    UpdateCheck,
    Reconnaissance,
    Tunneling,
}

#[derive(Debug, Clone)]
pub struct ExfiltrationIndicator {
    pub data_volume: usize,
    pub transfer_rate: f32,
    pub encryption_used: bool,
    pub steganography_used: bool,
}

#[derive(Debug, Clone)]
pub struct C2Indicator {
    pub communication_protocol: String,
    pub beacon_interval: Duration,
    pub jitter_factor: f32,
    pub encryption_method: Option<String>,
}

#[derive(Debug, Clone)]
pub struct FileSystemUsagePattern {
    pub file_operations: Vec<FileOperation>,
    pub persistence_mechanisms: Vec<PersistenceMechanism>,
    pub artifact_cleanup: ArtifactCleanup,
}

#[derive(Debug, Clone)]
pub struct FileOperation {
    pub operation_type: FileOperationType,
    pub file_path: String,
    pub frequency: u32,
    pub timing_pattern: TimingPattern,
}

#[derive(Debug, Clone)]
pub enum FileOperationType {
    Create,
    Read,
    Write,
    Delete,
    Modify,
    Rename,
    Copy,
}

#[derive(Debug, Clone)]
pub enum TimingPattern {
    Immediate,
    Scheduled,
    Triggered,
    Random,
}

#[derive(Debug, Clone)]
pub struct PersistenceMechanism {
    pub mechanism_type: PersistenceType,
    pub location: String,
    pub stealth_level: StealthLevel,
}

#[derive(Debug, Clone)]
pub enum PersistenceType {
    RegistryRun,
    ServiceInstallation,
    ScheduledTask,
    StartupFolder,
    DllHijacking,
    ProcessHollowing,
}

#[derive(Debug, Clone)]
pub enum StealthLevel {
    Obvious,
    Hidden,
    Obfuscated,
    Rootkit,
}

#[derive(Debug, Clone)]
pub struct ArtifactCleanup {
    pub cleanup_thoroughness: CleanupThoroughness,
    pub timing: CleanupTiming,
    pub methods_used: Vec<CleanupMethod>,
}

#[derive(Debug, Clone)]
pub enum CleanupThoroughness {
    None,
    Minimal,
    Moderate,
    Comprehensive,
    Forensic,
}

#[derive(Debug, Clone)]
pub enum CleanupTiming {
    Never,
    OnExit,
    Periodic,
    OnDetection,
    Immediate,
}

#[derive(Debug, Clone)]
pub enum CleanupMethod {
    SimpleDelete,
    SecureDelete,
    Overwrite,
    MetadataWipe,
    TimestampModification,
}

/// Code obfuscation and packing detection
#[derive(Debug)]
pub struct ObfuscationDetector {
    packer_signatures: Vec<PackerSignature>,
    obfuscation_patterns: Vec<ObfuscationPattern>,
    encryption_indicators: Vec<EncryptionIndicator>,
}

#[derive(Debug, Clone)]
pub struct PackerSignature {
    pub packer_name: String,
    pub signature_bytes: Vec<u8>,
    pub signature_offset: usize,
    pub unpacking_method: UnpackingMethod,
}

#[derive(Debug, Clone)]
pub enum UnpackingMethod {
    RuntimeUnpacking,
    StaticUnpacking,
    MemoryDumping,
    DynamicAnalysis,
}

#[derive(Debug, Clone)]
pub struct ObfuscationPattern {
    pub pattern_type: ObfuscationType,
    pub detection_signature: String,
    pub deobfuscation_difficulty: DeobfuscationDifficulty,
}

#[derive(Debug, Clone)]
pub enum ObfuscationType {
    StringObfuscation,
    ControlFlowObfuscation,
    DataObfuscation,
    ApiObfuscation,
    InstructionSubstitution,
    Polymorphism,
    Metamorphism,
}

#[derive(Debug, Clone)]
pub enum DeobfuscationDifficulty {
    Trivial,
    Easy,
    Moderate,
    Hard,
    Extreme,
}

#[derive(Debug, Clone)]
pub struct EncryptionIndicator {
    pub encryption_type: EncryptionType,
    pub key_derivation: KeyDerivation,
    pub entropy_level: f32,
}

#[derive(Debug, Clone)]
pub enum EncryptionType {
    XOR,
    AES,
    RC4,
    ChaCha20,
    Custom,
    Nested,
}

#[derive(Debug, Clone)]
pub enum KeyDerivation {
    Hardcoded,
    Environmental,
    Algorithmic,
    NetworkBased,
    UserInput,
}

impl Default for EvasionDetector {
    fn default() -> Self {
        Self::new()
    }
}

impl EvasionDetector {
    pub fn new() -> Self {
        Self {
            timing_analyzer: TimingAnalyzer::new(),
            environment_checker: EnvironmentChecker::new(),
            behavior_analyzer: BehaviorAnalyzer::new(),
            obfuscation_detector: ObfuscationDetector::new(),
        }
    }

    /// Comprehensive evasion analysis
    pub fn analyze_evasion(
        &mut self,
        process: &ProcessInfo,
        memory_regions: &[MemoryRegion],
        threads: &[ThreadInfo],
    ) -> EvasionResult {
        let mut evasion_techniques = Vec::new();
        let mut confidence = 0.0f32;
        let mut sophistication_score = 0.0f32;
        let mut anti_analysis_indicators = Vec::new();

        // Timing-based evasion analysis
        let timing_result = self
            .timing_analyzer
            .analyze_timing_evasion(process, threads);
        if !timing_result.techniques.is_empty() {
            evasion_techniques.extend(timing_result.techniques);
            confidence += timing_result.confidence * 0.3;
            sophistication_score += timing_result.sophistication * 0.25;
        }

        // Environment checking analysis
        let env_result = self.environment_checker.check_environment_evasion(process);
        if !env_result.techniques.is_empty() {
            evasion_techniques.extend(env_result.techniques);
            confidence += env_result.confidence * 0.3;
            sophistication_score += env_result.sophistication * 0.25;
        }

        // Behavioral analysis
        let behavior_result =
            self.behavior_analyzer
                .analyze_behavior_evasion(process, memory_regions, threads);
        if !behavior_result.techniques.is_empty() {
            evasion_techniques.extend(behavior_result.techniques);
            confidence += behavior_result.confidence * 0.25;
            sophistication_score += behavior_result.sophistication * 0.3;
        }

        // Obfuscation analysis
        let obfuscation_result = self
            .obfuscation_detector
            .detect_obfuscation(process, memory_regions);
        if !obfuscation_result.techniques.is_empty() {
            evasion_techniques.extend(obfuscation_result.techniques);
            confidence += obfuscation_result.confidence * 0.15;
            sophistication_score += obfuscation_result.sophistication * 0.2;
        }

        // Compile anti-analysis indicators
        anti_analysis_indicators.extend(timing_result.indicators);
        anti_analysis_indicators.extend(env_result.indicators);
        anti_analysis_indicators.extend(behavior_result.indicators);
        anti_analysis_indicators.extend(obfuscation_result.indicators);

        // Normalize scores
        confidence = confidence.min(1.0);
        sophistication_score = sophistication_score.min(1.0);

        EvasionResult {
            evasion_techniques,
            confidence,
            sophistication_score,
            anti_analysis_indicators,
        }
    }
}

impl Default for TimingAnalyzer {
    fn default() -> Self {
        Self::new()
    }
}

impl TimingAnalyzer {
    pub fn new() -> Self {
        Self {
            execution_timings: HashMap::new(),
            sleep_patterns: HashMap::new(),
        }
    }

    pub fn analyze_timing_evasion(
        &mut self,
        process: &ProcessInfo,
        threads: &[ThreadInfo],
    ) -> TimingEvasionResult {
        let mut techniques = Vec::new();
        let mut confidence = 0.0f32;
        let mut sophistication = 0.0f32;
        let mut indicators = Vec::new();

        // Detect sleep-based evasion
        if let Some(sleep_evasion) = self.detect_sleep_evasion(process) {
            techniques.push(sleep_evasion);
            confidence += 0.4;
            sophistication += 0.3;
            indicators.push("Suspicious sleep patterns detected".to_string());
        }

        // Detect execution timing anomalies
        if let Some(timing_evasion) = self.detect_timing_anomalies(process, threads) {
            techniques.push(timing_evasion);
            confidence += 0.3;
            sophistication += 0.4;
            indicators.push("Execution timing anomalies detected".to_string());
        }

        TimingEvasionResult {
            techniques,
            confidence,
            sophistication,
            indicators,
        }
    }

    fn detect_sleep_evasion(&self, _process: &ProcessInfo) -> Option<EvasionTechnique> {
        // Detect various sleep-based evasion techniques
        // This would analyze actual sleep patterns in a real implementation
        Some(EvasionTechnique {
            technique_name: "Sleep-based Evasion".to_string(),
            mitre_id: "T1497.003".to_string(),
            description: "Process uses sleep calls to evade dynamic analysis".to_string(),
            confidence: 0.7,
            indicators: vec![
                "Extended sleep periods before malicious activity".to_string(),
                "Random delay patterns".to_string(),
            ],
            severity: EvasionSeverity::Medium,
        })
    }

    fn detect_timing_anomalies(
        &self,
        _process: &ProcessInfo,
        _threads: &[ThreadInfo],
    ) -> Option<EvasionTechnique> {
        // Detect timing-based anti-analysis techniques
        Some(EvasionTechnique {
            technique_name: "Timing Check Evasion".to_string(),
            mitre_id: "T1497.003".to_string(),
            description: "Process uses timing checks to detect analysis environment".to_string(),
            confidence: 0.6,
            indicators: vec![
                "RDTSC instruction usage".to_string(),
                "QueryPerformanceCounter calls".to_string(),
            ],
            severity: EvasionSeverity::High,
        })
    }
}

#[derive(Debug, Clone)]
pub struct TimingEvasionResult {
    techniques: Vec<EvasionTechnique>,
    confidence: f32,
    sophistication: f32,
    indicators: Vec<String>,
}

impl Default for EnvironmentChecker {
    fn default() -> Self {
        Self::new()
    }
}

impl EnvironmentChecker {
    pub fn new() -> Self {
        Self {
            vm_indicators: Vec::new(),
            debugger_checks: Vec::new(),
            sandbox_signatures: Vec::new(),
        }
    }

    pub fn check_environment_evasion(&self, process: &ProcessInfo) -> EnvironmentEvasionResult {
        let mut techniques = Vec::new();
        let mut confidence = 0.0f32;
        let mut sophistication = 0.0f32;
        let mut indicators = Vec::new();

        // Check for VM detection
        if let Some(vm_evasion) = self.detect_vm_evasion(process) {
            techniques.push(vm_evasion);
            confidence += 0.5;
            sophistication += 0.4;
            indicators.push("Virtual machine detection attempted".to_string());
        }

        // Check for debugger detection
        if let Some(debugger_evasion) = self.detect_debugger_evasion(process) {
            techniques.push(debugger_evasion);
            confidence += 0.4;
            sophistication += 0.5;
            indicators.push("Debugger detection mechanisms present".to_string());
        }

        // Check for sandbox detection
        if let Some(sandbox_evasion) = self.detect_sandbox_evasion(process) {
            techniques.push(sandbox_evasion);
            confidence += 0.3;
            sophistication += 0.3;
            indicators.push("Sandbox evasion techniques detected".to_string());
        }

        EnvironmentEvasionResult {
            techniques,
            confidence,
            sophistication,
            indicators,
        }
    }

    fn detect_vm_evasion(&self, _process: &ProcessInfo) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "Virtual Machine Detection".to_string(),
            mitre_id: "T1497.001".to_string(),
            description: "Process attempts to detect virtual machine environment".to_string(),
            confidence: 0.8,
            indicators: vec![
                "VM artifact enumeration".to_string(),
                "Hardware fingerprinting".to_string(),
            ],
            severity: EvasionSeverity::High,
        })
    }

    fn detect_debugger_evasion(&self, _process: &ProcessInfo) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "Debugger Detection".to_string(),
            mitre_id: "T1497.001".to_string(),
            description: "Process implements anti-debugging techniques".to_string(),
            confidence: 0.9,
            indicators: vec![
                "IsDebuggerPresent API calls".to_string(),
                "PEB flag checks".to_string(),
                "Exception handler manipulation".to_string(),
            ],
            severity: EvasionSeverity::High,
        })
    }

    fn detect_sandbox_evasion(&self, _process: &ProcessInfo) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "Sandbox Detection".to_string(),
            mitre_id: "T1497.001".to_string(),
            description: "Process attempts to detect sandbox environment".to_string(),
            confidence: 0.7,
            indicators: vec![
                "Mouse movement monitoring".to_string(),
                "User interaction detection".to_string(),
                "System resource enumeration".to_string(),
            ],
            severity: EvasionSeverity::Medium,
        })
    }
}

#[derive(Debug, Clone)]
pub struct EnvironmentEvasionResult {
    techniques: Vec<EvasionTechnique>,
    confidence: f32,
    sophistication: f32,
    indicators: Vec<String>,
}

impl Default for BehaviorAnalyzer {
    fn default() -> Self {
        Self::new()
    }
}

impl BehaviorAnalyzer {
    pub fn new() -> Self {
        Self {
            api_hooking_detector: ApiHookingDetector::new(),
            execution_flow_analyzer: ExecutionFlowAnalyzer::new(),
            resource_usage_monitor: ResourceUsageMonitor::new(),
        }
    }

    pub fn analyze_behavior_evasion(
        &mut self,
        process: &ProcessInfo,
        memory_regions: &[MemoryRegion],
        _threads: &[ThreadInfo],
    ) -> BehaviorEvasionResult {
        let mut techniques = Vec::new();
        let mut confidence = 0.0f32;
        let mut sophistication = 0.0f32;
        let mut indicators = Vec::new();

        // API hooking analysis
        if let Some(api_evasion) = self.api_hooking_detector.detect_api_evasion(process) {
            techniques.push(api_evasion);
            confidence += 0.6;
            sophistication += 0.7;
            indicators.push("API hooking/unhooking detected".to_string());
        }

        // Execution flow analysis
        if let Some(flow_evasion) = self
            .execution_flow_analyzer
            .analyze_execution_flow(process, memory_regions)
        {
            techniques.push(flow_evasion);
            confidence += 0.5;
            sophistication += 0.8;
            indicators.push("Suspicious execution flow patterns".to_string());
        }

        BehaviorEvasionResult {
            techniques,
            confidence,
            sophistication,
            indicators,
        }
    }
}

#[derive(Debug, Clone)]
pub struct BehaviorEvasionResult {
    techniques: Vec<EvasionTechnique>,
    confidence: f32,
    sophistication: f32,
    indicators: Vec<String>,
}

impl Default for ApiHookingDetector {
    fn default() -> Self {
        Self::new()
    }
}

impl ApiHookingDetector {
    pub fn new() -> Self {
        Self {
            hooked_functions: HashMap::new(),
            inline_hooks: Vec::new(),
            iat_modifications: Vec::new(),
        }
    }

    pub fn detect_api_evasion(&self, _process: &ProcessInfo) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "API Hooking Evasion".to_string(),
            mitre_id: "T1562.002".to_string(),
            description: "Process modifies API hooks to evade detection".to_string(),
            confidence: 0.8,
            indicators: vec![
                "Runtime API patching detected".to_string(),
                "Import table modifications".to_string(),
                "Direct syscall usage".to_string(),
            ],
            severity: EvasionSeverity::High,
        })
    }
}

impl Default for ExecutionFlowAnalyzer {
    fn default() -> Self {
        Self::new()
    }
}

impl ExecutionFlowAnalyzer {
    pub fn new() -> Self {
        Self {
            control_flow_integrity: ControlFlowIntegrity {
                indirect_calls: Vec::new(),
                rop_gadgets: Vec::new(),
                jop_gadgets: Vec::new(),
            },
            return_address_verification: ReturnAddressVerification {
                shadow_stack: Vec::new(),
                call_stack: Vec::new(),
                anomalies: Vec::new(),
            },
            stack_analysis: StackAnalysis {
                stack_regions: Vec::new(),
                guard_pages: Vec::new(),
                canary_values: Vec::new(),
            },
        }
    }

    pub fn analyze_execution_flow(
        &self,
        _process: &ProcessInfo,
        _memory_regions: &[MemoryRegion],
    ) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "Control Flow Hijacking".to_string(),
            mitre_id: "T1055".to_string(),
            description: "Process uses advanced control flow techniques".to_string(),
            confidence: 0.9,
            indicators: vec![
                "ROP/JOP gadget chains detected".to_string(),
                "Return address manipulation".to_string(),
                "Control flow integrity bypassed".to_string(),
            ],
            severity: EvasionSeverity::Critical,
        })
    }
}

impl Default for ResourceUsageMonitor {
    fn default() -> Self {
        Self::new()
    }
}

impl ResourceUsageMonitor {
    pub fn new() -> Self {
        Self {
            cpu_usage: CpuUsagePattern {
                baseline_usage: 0.0,
                current_usage: 0.0,
                usage_spikes: Vec::new(),
                idle_periods: Vec::new(),
            },
            memory_usage: MemoryUsagePattern {
                allocation_patterns: Vec::new(),
                deallocation_patterns: Vec::new(),
                fragmentation_level: 0.0,
                heap_spray_indicators: Vec::new(),
            },
            network_usage: NetworkUsagePattern {
                connection_patterns: Vec::new(),
                data_exfiltration: Vec::new(),
                command_control: Vec::new(),
            },
            file_system_usage: FileSystemUsagePattern {
                file_operations: Vec::new(),
                persistence_mechanisms: Vec::new(),
                artifact_cleanup: ArtifactCleanup {
                    cleanup_thoroughness: CleanupThoroughness::None,
                    timing: CleanupTiming::Never,
                    methods_used: Vec::new(),
                },
            },
        }
    }
}

impl Default for ObfuscationDetector {
    fn default() -> Self {
        Self::new()
    }
}

impl ObfuscationDetector {
    pub fn new() -> Self {
        Self {
            packer_signatures: Vec::new(),
            obfuscation_patterns: Vec::new(),
            encryption_indicators: Vec::new(),
        }
    }

    pub fn detect_obfuscation(
        &self,
        process: &ProcessInfo,
        memory_regions: &[MemoryRegion],
    ) -> ObfuscationEvasionResult {
        let mut techniques = Vec::new();
        let mut confidence = 0.0f32;
        let mut sophistication = 0.0f32;
        let mut indicators = Vec::new();

        // Detect packing
        if let Some(packer_evasion) = self.detect_packer_evasion(process, memory_regions) {
            techniques.push(packer_evasion);
            confidence += 0.5;
            sophistication += 0.4;
            indicators.push("Packed/obfuscated code detected".to_string());
        }

        // Detect code obfuscation
        if let Some(code_evasion) = self.detect_code_obfuscation(process, memory_regions) {
            techniques.push(code_evasion);
            confidence += 0.4;
            sophistication += 0.6;
            indicators.push("Code obfuscation techniques present".to_string());
        }

        ObfuscationEvasionResult {
            techniques,
            confidence,
            sophistication,
            indicators,
        }
    }

    fn detect_packer_evasion(
        &self,
        _process: &ProcessInfo,
        _memory_regions: &[MemoryRegion],
    ) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "Runtime Packing".to_string(),
            mitre_id: "T1027.002".to_string(),
            description: "Process uses runtime packing to evade static analysis".to_string(),
            confidence: 0.7,
            indicators: vec![
                "High entropy sections detected".to_string(),
                "Runtime unpacking behavior".to_string(),
                "Modified PE headers".to_string(),
            ],
            severity: EvasionSeverity::Medium,
        })
    }

    fn detect_code_obfuscation(
        &self,
        _process: &ProcessInfo,
        _memory_regions: &[MemoryRegion],
    ) -> Option<EvasionTechnique> {
        Some(EvasionTechnique {
            technique_name: "Code Obfuscation".to_string(),
            mitre_id: "T1027".to_string(),
            description: "Process implements sophisticated code obfuscation".to_string(),
            confidence: 0.8,
            indicators: vec![
                "Control flow obfuscation".to_string(),
                "String encryption".to_string(),
                "Polymorphic code".to_string(),
            ],
            severity: EvasionSeverity::High,
        })
    }
}

#[derive(Debug, Clone)]
pub struct ObfuscationEvasionResult {
    techniques: Vec<EvasionTechnique>,
    confidence: f32,
    sophistication: f32,
    indicators: Vec<String>,
}