voirs-spatial 0.1.0-rc.1

//! # High-Fidelity Spatial Telepresence System
//!
//! This module provides advanced spatial audio telepresence capabilities,
//! enabling immersive remote communication experiences with realistic 3D positioning,
//! room simulation, and high-quality voice processing.

use crate::{types::AudioChannel, Position3D, Result};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};

/// Telepresence session interface
pub trait TelepresenceSession: Send + Sync {
    /// Join the telepresence session
    fn join(&mut self, user_config: &UserConfig) -> Result<SessionJoinResult>;

    /// Leave the telepresence session
    fn leave(&mut self) -> Result<()>;

    /// Send audio data to the session
    fn send_audio(&mut self, audio_data: &[f32], metadata: &AudioMetadata) -> Result<()>;

    /// Receive audio data from the session
    fn receive_audio(&mut self) -> Result<Vec<ReceivedAudio>>;

    /// Update user position
    fn update_position(&mut self, position: Position3D, orientation: Orientation) -> Result<()>;

    /// Get session state
    fn session_state(&self) -> SessionState;

    /// Get session statistics
    fn statistics(&self) -> SessionStatistics;
}

/// User configuration for telepresence
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserConfig {
    /// User identifier
    pub user_id: String,

    /// Display name
    pub display_name: String,

    /// Audio settings
    pub audio_settings: TelepresenceAudioSettings,

    /// Spatial settings
    pub spatial_settings: SpatialTelepresenceSettings,

    /// Network preferences
    pub network_settings: NetworkSettings,

    /// Quality preferences
    pub quality_settings: QualitySettings,

    /// Privacy settings
    pub privacy_settings: PrivacySettings,
}

/// Audio settings for telepresence
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TelepresenceAudioSettings {
    /// Input device configuration
    pub input_device: AudioDeviceConfig,

    /// Output device configuration
    pub output_device: AudioDeviceConfig,

    /// Voice processing settings
    pub voice_processing: VoiceProcessingSettings,

    /// Audio quality preferences
    pub quality_preferences: AudioQualityPreferences,

    /// Codec preferences
    pub codec_preferences: CodecPreferences,
}

/// Audio device configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioDeviceConfig {
    /// Device identifier
    pub device_id: Option<String>,

    /// Sample rate (Hz)
    pub sample_rate: u32,

    /// Buffer size (samples)
    pub buffer_size: usize,

    /// Channel count
    pub channels: u8,

    /// Bit depth
    pub bit_depth: u8,

    /// Device-specific settings
    pub device_settings: HashMap<String, String>,
}

/// Voice processing settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VoiceProcessingSettings {
    /// Automatic gain control
    pub agc_enabled: bool,

    /// Noise suppression
    pub noise_suppression: NoiseSuppressionSettings,

    /// Echo cancellation
    pub echo_cancellation: EchoCancellationSettings,

    /// Voice activity detection
    pub vad_settings: VadSettings,

    /// Audio enhancement
    pub enhancement: AudioEnhancementSettings,

    /// Spatialization settings
    pub spatialization: VoiceSpatializationSettings,
}

/// Noise suppression configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NoiseSuppressionSettings {
    /// Enable noise suppression
    pub enabled: bool,

    /// Suppression strength (0.0-1.0)
    pub strength: f32,

    /// Suppression algorithm
    pub algorithm: NoiseSuppressionAlgorithm,

    /// Adaptive learning
    pub adaptive: bool,

    /// Stationary noise suppression
    pub stationary_suppression: f32,

    /// Non-stationary noise suppression
    pub non_stationary_suppression: f32,
}

/// Noise suppression algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum NoiseSuppressionAlgorithm {
    /// Spectral subtraction
    SpectralSubtraction,

    /// Wiener filtering
    WienerFilter,

    /// Neural network based
    NeuralNetwork,

    /// Minimum mean square error
    MMSE,

    /// Hybrid approach
    Hybrid,
}

/// Echo cancellation configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EchoCancellationSettings {
    /// Enable echo cancellation
    pub enabled: bool,

    /// Cancellation strength (0.0-1.0)
    pub strength: f32,

    /// Echo cancellation algorithm
    pub algorithm: EchoCancellationAlgorithm,

    /// Tail length (samples)
    pub tail_length: usize,

    /// Adaptation rate
    pub adaptation_rate: f32,

    /// Non-linear processing
    pub non_linear_processing: bool,
}

/// Echo cancellation algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EchoCancellationAlgorithm {
    /// Normalized Least Mean Squares
    NLMS,

    /// Recursive Least Squares
    RLS,

    /// Proportionate NLMS
    PNLMS,

    /// Kalman filter based
    Kalman,

    /// Frequency domain adaptive filter
    FrequencyDomain,
}

/// Voice Activity Detection settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VadSettings {
    /// Enable VAD
    pub enabled: bool,

    /// Detection sensitivity (0.0-1.0)
    pub sensitivity: f32,

    /// VAD algorithm
    pub algorithm: VadAlgorithm,

    /// Minimum voice duration (ms)
    pub min_voice_duration: f32,

    /// Minimum silence duration (ms)
    pub min_silence_duration: f32,

    /// Hangover time (ms)
    pub hangover_time: f32,
}

/// VAD algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum VadAlgorithm {
    /// Energy-based VAD
    Energy,

    /// Spectral-based VAD
    Spectral,

    /// Model-based VAD
    Model,

    /// Neural network VAD
    Neural,

    /// Hybrid VAD
    Hybrid,
}

/// Audio enhancement settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioEnhancementSettings {
    /// Enable enhancement
    pub enabled: bool,

    /// Dynamic range compression
    pub dynamic_range_compression: CompressionSettings,

    /// Equalization
    pub equalization: EqualizationSettings,

    /// Bandwidth extension
    pub bandwidth_extension: BandwidthExtensionSettings,

    /// Comfort noise generation
    pub comfort_noise: ComfortNoiseSettings,
}

/// Dynamic range compression settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompressionSettings {
    /// Enable compression
    pub enabled: bool,

    /// Compression ratio
    pub ratio: f32,

    /// Threshold (dB)
    pub threshold: f32,

    /// Attack time (ms)
    pub attack_time: f32,

    /// Release time (ms)
    pub release_time: f32,

    /// Makeup gain (dB)
    pub makeup_gain: f32,
}

/// Equalization settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EqualizationSettings {
    /// Enable EQ
    pub enabled: bool,

    /// EQ bands
    pub bands: Vec<EqBand>,

    /// EQ type
    pub eq_type: EqualizationType,

    /// Adaptive EQ
    pub adaptive: bool,
}

/// EQ band configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EqBand {
    /// Center frequency (Hz)
    pub frequency: f32,

    /// Gain (dB)
    pub gain: f32,

    /// Q factor
    pub q_factor: f32,

    /// Band type
    pub band_type: EqBandType,
}

/// EQ band types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EqBandType {
    /// Low shelf
    LowShelf,

    /// High shelf
    HighShelf,

    /// Peaking
    Peaking,

    /// Low pass
    LowPass,

    /// High pass
    HighPass,

    /// Notch
    Notch,
}

/// Equalization types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EqualizationType {
    /// Parametric EQ
    Parametric,

    /// Graphic EQ
    Graphic,

    /// Shelving EQ
    Shelving,

    /// Custom filter
    Custom,
}

/// Bandwidth extension settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BandwidthExtensionSettings {
    /// Enable bandwidth extension
    pub enabled: bool,

    /// Target bandwidth (Hz)
    pub target_bandwidth: f32,

    /// Extension algorithm
    pub algorithm: BandwidthExtensionAlgorithm,

    /// Extension strength
    pub strength: f32,
}

/// Bandwidth extension algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum BandwidthExtensionAlgorithm {
    /// Spectral replication
    SpectralReplication,

    /// Harmonic extension
    HarmonicExtension,

    /// Neural network extension
    NeuralExtension,

    /// Model-based extension
    ModelBased,
}

/// Comfort noise settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComfortNoiseSettings {
    /// Enable comfort noise
    pub enabled: bool,

    /// Noise level (dB)
    pub level: f32,

    /// Noise color
    pub color: NoiseColor,

    /// Adaptive level
    pub adaptive_level: bool,
}

/// Noise color types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum NoiseColor {
    /// White noise
    White,

    /// Pink noise
    Pink,

    /// Brown noise
    Brown,

    /// Blue noise
    Blue,

    /// Custom spectrum
    Custom,
}

/// Voice spatialization settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VoiceSpatializationSettings {
    /// Enable spatialization
    pub enabled: bool,

    /// HRTF personalization
    pub hrtf_personalization: HrtfPersonalizationSettings,

    /// Room simulation
    pub room_simulation: RoomSimulationSettings,

    /// Distance modeling
    pub distance_modeling: DistanceModelingSettings,

    /// Doppler effects
    pub doppler_effects: DopplerEffectsSettings,
}

/// HRTF personalization for voice
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HrtfPersonalizationSettings {
    /// Enable personalization
    pub enabled: bool,

    /// User measurements
    pub measurements: Option<UserMeasurements>,

    /// Personalization method
    pub method: PersonalizationMethod,

    /// Adaptation strength
    pub adaptation_strength: f32,
}

/// User physical measurements for HRTF
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserMeasurements {
    /// Head circumference (cm)
    pub head_circumference: f32,

    /// Pinna length (cm)
    pub pinna_length: f32,

    /// Pinna width (cm)
    pub pinna_width: f32,

    /// Torso width (cm)
    pub torso_width: f32,

    /// Custom measurements
    pub custom_measurements: HashMap<String, f32>,
}

/// HRTF personalization methods
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum PersonalizationMethod {
    /// Anthropometric scaling
    Anthropometric,

    /// Machine learning adaptation
    MachineLearning,

    /// User feedback adaptation
    UserFeedback,

    /// Hybrid approach
    Hybrid,
}

/// Room simulation for telepresence
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RoomSimulationSettings {
    /// Enable room simulation
    pub enabled: bool,

    /// Virtual room parameters
    pub virtual_room: VirtualRoomParameters,

    /// Acoustic matching
    pub acoustic_matching: AcousticMatchingSettings,

    /// Cross-room interaction
    pub cross_room_interaction: CrossRoomSettings,
}

/// Virtual room parameters
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VirtualRoomParameters {
    /// Room dimensions (width, height, depth in meters)
    pub dimensions: (f32, f32, f32),

    /// Room materials
    pub materials: RoomMaterials,

    /// Room layout
    pub layout: RoomLayout,

    /// Acoustic properties
    pub acoustic_properties: AcousticProperties,
}

/// Room materials configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RoomMaterials {
    /// Wall materials
    pub walls: Vec<MaterialProperties>,

    /// Floor material
    pub floor: MaterialProperties,

    /// Ceiling material
    pub ceiling: MaterialProperties,

    /// Furniture and objects
    pub objects: Vec<ObjectMaterial>,
}

/// Material acoustic properties
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MaterialProperties {
    /// Material name
    pub name: String,

    /// Absorption coefficients by frequency
    pub absorption: Vec<(f32, f32)>,

    /// Scattering coefficients by frequency
    pub scattering: Vec<(f32, f32)>,

    /// Transmission coefficients
    pub transmission: Vec<(f32, f32)>,
}

/// Object material configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ObjectMaterial {
    /// Object identifier
    pub object_id: String,

    /// Object position
    pub position: Position3D,

    /// Object dimensions
    pub dimensions: (f32, f32, f32),

    /// Material properties
    pub material: MaterialProperties,
}

/// Room layout configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RoomLayout {
    /// Room shape
    pub shape: RoomShape,

    /// Doorways and openings
    pub openings: Vec<Opening>,

    /// Furniture placement
    pub furniture: Vec<FurnitureItem>,

    /// User positions
    pub user_positions: Vec<UserPosition>,
}

/// Room shape types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum RoomShape {
    /// Rectangular room
    Rectangular,

    /// L-shaped room
    LShaped,

    /// Circular room
    Circular,

    /// Irregular shape
    Irregular,

    /// Custom shape
    Custom,
}

/// Opening configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Opening {
    /// Opening identifier
    pub id: String,

    /// Opening type
    pub opening_type: OpeningType,

    /// Position and dimensions
    pub geometry: OpeningGeometry,

    /// Acoustic properties
    pub acoustic_properties: OpeningAcoustics,
}

/// Opening types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum OpeningType {
    /// Door
    Door,

    /// Window
    Window,

    /// Archway
    Archway,

    /// Vent
    Vent,

    /// Custom opening
    Custom,
}

/// Opening geometry
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OpeningGeometry {
    /// Position
    pub position: Position3D,

    /// Width (m)
    pub width: f32,

    /// Height (m)
    pub height: f32,

    /// Depth (m)
    pub depth: f32,

    /// Orientation (degrees)
    pub orientation: f32,
}

/// Opening acoustic properties
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OpeningAcoustics {
    /// Open state (0.0 = closed, 1.0 = fully open)
    pub open_state: f32,

    /// Sound transmission coefficient
    pub transmission_coefficient: f32,

    /// Diffraction coefficient
    pub diffraction_coefficient: f32,
}

/// Furniture item configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FurnitureItem {
    /// Item identifier
    pub id: String,

    /// Furniture type
    pub furniture_type: FurnitureType,

    /// Position and size
    pub geometry: FurnitureGeometry,

    /// Acoustic impact
    pub acoustic_impact: FurnitureAcoustics,
}

/// Furniture types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum FurnitureType {
    /// Table
    Table,

    /// Chair
    Chair,

    /// Sofa
    Sofa,

    /// Bookshelf
    Bookshelf,

    /// Desk
    Desk,

    /// Bed
    Bed,

    /// Custom furniture
    Custom,
}

/// Furniture geometry
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FurnitureGeometry {
    /// Position
    pub position: Position3D,

    /// Dimensions (width, height, depth)
    pub dimensions: (f32, f32, f32),

    /// Rotation (degrees)
    pub rotation: f32,
}

/// Furniture acoustic properties
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FurnitureAcoustics {
    /// Absorption coefficient
    pub absorption: f32,

    /// Scattering coefficient
    pub scattering: f32,

    /// Occlusion factor
    pub occlusion_factor: f32,
}

/// User position in room
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserPosition {
    /// User identifier
    pub user_id: String,

    /// Position in room
    pub position: Position3D,

    /// Orientation
    pub orientation: Orientation,

    /// Movement constraints
    pub movement_constraints: MovementConstraints,
}

/// 3D orientation representation
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct Orientation {
    /// Yaw (rotation around Y axis, degrees)
    pub yaw: f32,

    /// Pitch (rotation around X axis, degrees)
    pub pitch: f32,

    /// Roll (rotation around Z axis, degrees)
    pub roll: f32,
}

/// Movement constraints for users
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MovementConstraints {
    /// Allowed area bounds
    pub bounds: Option<BoundingBox>,

    /// Movement speed limit (m/s)
    pub max_speed: f32,

    /// Allowed movement types
    pub allowed_movements: Vec<MovementType>,
}

/// Bounding box for movement
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct BoundingBox {
    /// Minimum corner
    pub min: Position3D,

    /// Maximum corner
    pub max: Position3D,
}

/// Movement types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum MovementType {
    /// Free movement
    Free,

    /// Walking only
    Walking,

    /// Seated position
    Seated,

    /// Standing only
    Standing,

    /// Teleport movement
    Teleport,
}

/// Acoustic properties for rooms
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AcousticProperties {
    /// Reverberation time (seconds)
    pub reverb_time: f32,

    /// Early decay time (seconds)
    pub early_decay_time: f32,

    /// Clarity index
    pub clarity: f32,

    /// Definition
    pub definition: f32,

    /// Intimacy time (ms)
    pub intimacy_time: f32,

    /// Background noise level (dB)
    pub background_noise: f32,
}

/// Acoustic matching settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AcousticMatchingSettings {
    /// Enable acoustic matching
    pub enabled: bool,

    /// Matching algorithm
    pub algorithm: AcousticMatchingAlgorithm,

    /// Matching strength (0.0-1.0)
    pub strength: f32,

    /// Real-time adaptation
    pub real_time_adaptation: bool,
}

/// Acoustic matching algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AcousticMatchingAlgorithm {
    /// Direct parameter matching
    Direct,

    /// Convolution-based matching
    Convolution,

    /// ML-based matching
    MachineLearning,

    /// Hybrid matching
    Hybrid,
}

/// Cross-room interaction settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CrossRoomSettings {
    /// Enable cross-room audio
    pub enabled: bool,

    /// Attenuation between rooms
    pub inter_room_attenuation: f32,

    /// Room isolation level
    pub isolation_level: f32,

    /// Shared spaces
    pub shared_spaces: Vec<SharedSpace>,
}

/// Shared space configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SharedSpace {
    /// Space identifier
    pub id: String,

    /// Space type
    pub space_type: SharedSpaceType,

    /// Connected rooms
    pub connected_rooms: Vec<String>,

    /// Acoustic properties
    pub acoustic_properties: AcousticProperties,
}

/// Shared space types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum SharedSpaceType {
    /// Virtual lobby
    Lobby,

    /// Meeting room
    MeetingRoom,

    /// Breakout room
    BreakoutRoom,

    /// Social space
    SocialSpace,

    /// Custom space
    Custom,
}

/// Distance modeling settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DistanceModelingSettings {
    /// Enable distance modeling
    pub enabled: bool,

    /// Attenuation model
    pub attenuation_model: AttenuationModel,

    /// Air absorption
    pub air_absorption: AirAbsorptionSettings,

    /// Maximum audible distance
    pub max_distance: f32,

    /// Near field compensation
    pub near_field_compensation: bool,
}

/// Attenuation models
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AttenuationModel {
    /// Inverse distance law
    InverseDistance,

    /// Inverse square law
    InverseSquare,

    /// Linear attenuation
    Linear,

    /// Exponential attenuation
    Exponential,

    /// Custom model
    Custom,
}

/// Air absorption settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AirAbsorptionSettings {
    /// Enable air absorption
    pub enabled: bool,

    /// Temperature (Celsius)
    pub temperature: f32,

    /// Humidity (percentage)
    pub humidity: f32,

    /// Atmospheric pressure (Pa)
    pub pressure: f32,
}

/// Doppler effects settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DopplerEffectsSettings {
    /// Enable Doppler effects
    pub enabled: bool,

    /// Doppler factor scaling
    pub factor_scaling: f32,

    /// Maximum Doppler shift (Hz)
    pub max_shift: f32,

    /// Smoothing factor
    pub smoothing: f32,
}

/// Audio quality preferences
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioQualityPreferences {
    /// Preferred quality level
    pub quality_level: QualityLevel,

    /// Adaptive quality
    pub adaptive_quality: bool,

    /// Latency priority
    pub latency_priority: LatencyPriority,

    /// Bandwidth constraints
    pub bandwidth_constraints: BandwidthConstraints,
}

/// Quality levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum QualityLevel {
    /// Low quality (optimized for bandwidth)
    Low,

    /// Medium quality (balanced)
    Medium,

    /// High quality (optimized for quality)
    High,

    /// Ultra quality (maximum quality)
    Ultra,

    /// Custom quality settings
    Custom,
}

/// Latency priority levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum LatencyPriority {
    /// Minimize latency
    Low,

    /// Balance latency and quality
    Medium,

    /// Accept higher latency for quality
    High,
}

/// Bandwidth constraints
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BandwidthConstraints {
    /// Maximum bandwidth (kbps)
    pub max_bandwidth: u32,

    /// Minimum bandwidth (kbps)
    pub min_bandwidth: u32,

    /// Adaptive bandwidth
    pub adaptive: bool,

    /// Bandwidth measurement interval (ms)
    pub measurement_interval: u32,
}

/// Codec preferences
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CodecPreferences {
    /// Preferred codecs in priority order
    pub preferred_codecs: Vec<AudioCodec>,

    /// Codec-specific settings
    pub codec_settings: HashMap<AudioCodec, CodecSettings>,

    /// Fallback behavior
    pub fallback_behavior: CodecFallbackBehavior,
}

/// Audio codecs
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum AudioCodec {
    /// Opus codec
    Opus,

    /// AAC codec
    AAC,

    /// MP3 codec
    MP3,

    /// PCM (uncompressed)
    PCM,

    /// G.722 codec
    G722,

    /// G.711 codec
    G711,

    /// Custom codec
    Custom(String),
}

/// Codec-specific settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CodecSettings {
    /// Bitrate (kbps)
    pub bitrate: u32,

    /// Complexity level
    pub complexity: u8,

    /// Variable bitrate
    pub variable_bitrate: bool,

    /// Forward error correction
    pub fec: bool,

    /// Codec-specific parameters
    pub parameters: HashMap<String, String>,
}

/// Codec fallback behavior
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum CodecFallbackBehavior {
    /// Use next preferred codec
    NextPreferred,

    /// Use most compatible codec
    MostCompatible,

    /// Use lowest latency codec
    LowestLatency,

    /// Fail if preferred not available
    Fail,
}

/// Spatial telepresence settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SpatialTelepresenceSettings {
    /// Enable spatial audio
    pub spatial_enabled: bool,

    /// Spatial quality level
    pub spatial_quality: SpatialQualityLevel,

    /// Head tracking integration
    pub head_tracking: HeadTrackingSettings,

    /// Environmental awareness
    pub environmental_awareness: EnvironmentalAwarenessSettings,

    /// Presence indicators
    pub presence_indicators: PresenceIndicatorSettings,
}

/// Spatial quality levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum SpatialQualityLevel {
    /// Basic stereo positioning
    Basic,

    /// Enhanced spatial processing
    Enhanced,

    /// Full 3D spatial audio
    Full3D,

    /// Ultra-high fidelity spatial
    UltraHiFi,
}

/// Head tracking settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HeadTrackingSettings {
    /// Enable head tracking
    pub enabled: bool,

    /// Tracking source
    pub tracking_source: TrackingSource,

    /// Prediction settings
    pub prediction: TrackingPredictionSettings,

    /// Smoothing settings
    pub smoothing: TrackingSmoothingSettings,
}

/// Head tracking sources
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum TrackingSource {
    /// VR headset tracking
    VRHeadset,

    /// Webcam-based tracking
    Webcam,

    /// IMU-based tracking
    IMU,

    /// Phone/tablet gyroscope
    MobileGyroscope,

    /// External tracking system
    External,

    /// No tracking (static)
    None,
}

/// Tracking prediction settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrackingPredictionSettings {
    /// Enable prediction
    pub enabled: bool,

    /// Prediction horizon (ms)
    pub horizon: f32,

    /// Prediction algorithm
    pub algorithm: PredictionAlgorithm,

    /// Confidence threshold
    pub confidence_threshold: f32,
}

/// Prediction algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum PredictionAlgorithm {
    /// Linear extrapolation
    Linear,

    /// Kalman filter
    Kalman,

    /// Neural network
    Neural,

    /// Adaptive filter
    Adaptive,
}

/// Tracking smoothing settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrackingSmoothingSettings {
    /// Position smoothing factor
    pub position_smoothing: f32,

    /// Orientation smoothing factor
    pub orientation_smoothing: f32,

    /// Velocity smoothing factor
    pub velocity_smoothing: f32,

    /// Jitter reduction
    pub jitter_reduction: f32,
}

/// Environmental awareness settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EnvironmentalAwarenessSettings {
    /// Enable environmental audio
    pub enabled: bool,

    /// Ambient sound sharing
    pub ambient_sharing: AmbientSharingSettings,

    /// Background noise handling
    pub background_noise: BackgroundNoiseSettings,

    /// Acoustic echo from environment
    pub acoustic_echo: AcousticEchoSettings,
}

/// Ambient sound sharing settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AmbientSharingSettings {
    /// Enable ambient sharing
    pub enabled: bool,

    /// Ambient level (0.0-1.0)
    pub level: f32,

    /// Frequency filtering
    pub frequency_filtering: FrequencyFilterSettings,

    /// Spatial ambient processing
    pub spatial_processing: bool,
}

/// Frequency filter settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FrequencyFilterSettings {
    /// High-pass cutoff (Hz)
    pub highpass_cutoff: f32,

    /// Low-pass cutoff (Hz)
    pub lowpass_cutoff: f32,

    /// Notch filters
    pub notch_filters: Vec<NotchFilter>,
}

/// Notch filter configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NotchFilter {
    /// Center frequency (Hz)
    pub frequency: f32,

    /// Q factor
    pub q_factor: f32,

    /// Attenuation (dB)
    pub attenuation: f32,
}

/// Background noise settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BackgroundNoiseSettings {
    /// Noise suppression level
    pub suppression_level: f32,

    /// Adaptive suppression
    pub adaptive_suppression: bool,

    /// Noise gate threshold
    pub gate_threshold: f32,

    /// Noise profiling
    pub noise_profiling: NoiseProfilingSettings,
}

/// Noise profiling settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NoiseProfilingSettings {
    /// Enable automatic profiling
    pub enabled: bool,

    /// Profiling duration (seconds)
    pub duration: f32,

    /// Update interval (seconds)
    pub update_interval: f32,

    /// Profile adaptation rate
    pub adaptation_rate: f32,
}

/// Acoustic echo settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AcousticEchoSettings {
    /// Echo detection sensitivity
    pub detection_sensitivity: f32,

    /// Echo suppression strength
    pub suppression_strength: f32,

    /// Echo path modeling
    pub path_modeling: bool,

    /// Nonlinear echo processing
    pub nonlinear_processing: bool,
}

/// Presence indicator settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PresenceIndicatorSettings {
    /// Enable presence indicators
    pub enabled: bool,

    /// Visual indicators
    pub visual_indicators: VisualPresenceSettings,

    /// Audio indicators
    pub audio_indicators: AudioPresenceSettings,

    /// Breathing room detection
    pub breathing_room: BreathingRoomSettings,
}

/// Visual presence settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VisualPresenceSettings {
    /// Show speaking indicator
    pub speaking_indicator: bool,

    /// Show position indicator
    pub position_indicator: bool,

    /// Show attention indicator
    pub attention_indicator: bool,

    /// Indicator style
    pub indicator_style: IndicatorStyle,
}

/// Indicator styles
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum IndicatorStyle {
    /// Minimal indicators
    Minimal,

    /// Standard indicators
    Standard,

    /// Rich indicators
    Rich,

    /// Custom style
    Custom,
}

/// Audio presence settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioPresenceSettings {
    /// Spatial breathing sounds
    pub breathing_sounds: bool,

    /// Footstep simulation
    pub footsteps: bool,

    /// Cloth/movement sounds
    pub movement_sounds: bool,

    /// Presence audio level
    pub presence_level: f32,
}

/// Breathing room settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BreathingRoomSettings {
    /// Enable breathing room
    pub enabled: bool,

    /// Personal space radius (meters)
    pub personal_space: f32,

    /// Comfort distance (meters)
    pub comfort_distance: f32,

    /// Audio adjustments for proximity
    pub proximity_adjustments: ProximityAdjustments,
}

/// Proximity-based audio adjustments
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProximityAdjustments {
    /// Volume adjustment for close proximity
    pub volume_adjustment: f32,

    /// Frequency response adjustment
    pub frequency_adjustment: FrequencyResponseAdjustment,

    /// Reverb adjustment
    pub reverb_adjustment: f32,

    /// Intimacy enhancement
    pub intimacy_enhancement: bool,
}

/// Frequency response adjustment
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FrequencyResponseAdjustment {
    /// Low frequency boost/cut (dB)
    pub low_freq_adjustment: f32,

    /// Mid frequency boost/cut (dB)
    pub mid_freq_adjustment: f32,

    /// High frequency boost/cut (dB)
    pub high_freq_adjustment: f32,
}

/// Network settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NetworkSettings {
    /// Connection preferences
    pub connection_preferences: ConnectionPreferences,

    /// QoS settings
    pub qos_settings: QosSettings,

    /// Firewall and NAT
    pub firewall_settings: FirewallSettings,

    /// Redundancy settings
    pub redundancy_settings: RedundancySettings,
}

/// Connection preferences
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConnectionPreferences {
    /// Preferred connection type
    pub preferred_type: ConnectionType,

    /// Allowed connection types
    pub allowed_types: Vec<ConnectionType>,

    /// Connection timeout (ms)
    pub timeout: u32,

    /// Retry attempts
    pub retry_attempts: u8,

    /// IPv6 preference
    pub ipv6_preferred: bool,
}

/// Connection types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ConnectionType {
    /// Direct peer-to-peer
    P2P,

    /// Server-mediated
    ServerMediated,

    /// TURN relay
    TurnRelay,

    /// STUN-assisted
    StunAssisted,

    /// Automatic selection
    Auto,
}

/// Quality of Service settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QosSettings {
    /// DSCP marking
    pub dscp_marking: DscpMarking,

    /// Traffic shaping
    pub traffic_shaping: TrafficShapingSettings,

    /// Congestion control
    pub congestion_control: CongestionControlSettings,

    /// Jitter buffer settings
    pub jitter_buffer: JitterBufferSettings,
}

/// DSCP marking for QoS
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DscpMarking {
    /// Best effort
    BestEffort,

    /// Expedited forwarding
    ExpeditedForwarding,

    /// Assured forwarding
    AssuredForwarding,

    /// Voice
    Voice,

    /// Custom DSCP value
    Custom(u8),
}

/// Traffic shaping settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TrafficShapingSettings {
    /// Enable traffic shaping
    pub enabled: bool,

    /// Maximum burst size (bytes)
    pub max_burst: u32,

    /// Sustained rate (bps)
    pub sustained_rate: u32,

    /// Peak rate (bps)
    pub peak_rate: u32,
}

/// Congestion control settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CongestionControlSettings {
    /// Congestion control algorithm
    pub algorithm: CongestionControlAlgorithm,

    /// Initial bandwidth estimate (bps)
    pub initial_bandwidth: u32,

    /// Bandwidth probe interval (ms)
    pub probe_interval: u32,

    /// Congestion window size
    pub window_size: u32,
}

/// Congestion control algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum CongestionControlAlgorithm {
    /// TCP-friendly
    TcpFriendly,

    /// Google Congestion Control
    GCC,

    /// WebRTC congestion control
    WebRTC,

    /// Custom algorithm
    Custom,
}

/// Jitter buffer settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JitterBufferSettings {
    /// Minimum buffer size (ms)
    pub min_buffer: u32,

    /// Maximum buffer size (ms)
    pub max_buffer: u32,

    /// Target buffer size (ms)
    pub target_buffer: u32,

    /// Adaptive buffer sizing
    pub adaptive: bool,

    /// Fast adaptation
    pub fast_adaptation: bool,
}

/// Firewall and NAT settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FirewallSettings {
    /// STUN server configuration
    pub stun_servers: Vec<StunServerConfig>,

    /// TURN server configuration
    pub turn_servers: Vec<TurnServerConfig>,

    /// ICE settings
    pub ice_settings: IceSettings,

    /// Port range for media
    pub port_range: Option<(u16, u16)>,
}

/// STUN server configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StunServerConfig {
    /// Server URL
    pub url: String,

    /// Port
    pub port: u16,

    /// Protocol
    pub protocol: StunProtocol,
}

/// STUN protocols
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum StunProtocol {
    /// UDP
    UDP,

    /// TCP
    TCP,

    /// TLS
    TLS,
}

/// TURN server configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TurnServerConfig {
    /// Server URL
    pub url: String,

    /// Port
    pub port: u16,

    /// Username
    pub username: String,

    /// Credential
    pub credential: String,

    /// Protocol
    pub protocol: TurnProtocol,
}

/// TURN protocols
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum TurnProtocol {
    /// UDP
    UDP,

    /// TCP
    TCP,

    /// TLS
    TLS,

    /// DTLS
    DTLS,
}

/// ICE (Interactive Connectivity Establishment) settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IceSettings {
    /// ICE gathering policy
    pub gathering_policy: IceGatheringPolicy,

    /// ICE transport policy
    pub transport_policy: IceTransportPolicy,

    /// Candidate timeout (ms)
    pub candidate_timeout: u32,

    /// Connection check timeout (ms)
    pub connection_timeout: u32,
}

/// ICE gathering policies
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum IceGatheringPolicy {
    /// Gather all candidates
    All,

    /// Only relay candidates
    Relay,

    /// No host candidates
    NoHost,
}

/// ICE transport policies
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum IceTransportPolicy {
    /// All transports
    All,

    /// Only relay
    Relay,

    /// No UDP
    NoUDP,
}

/// Redundancy settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RedundancySettings {
    /// Enable redundancy
    pub enabled: bool,

    /// Redundancy type
    pub redundancy_type: RedundancyType,

    /// Backup connections
    pub backup_connections: u8,

    /// Failover timeout (ms)
    pub failover_timeout: u32,
}

/// Redundancy types
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum RedundancyType {
    /// Active-passive
    ActivePassive,

    /// Active-active
    ActiveActive,

    /// Load balancing
    LoadBalancing,

    /// Path diversity
    PathDiversity,
}

/// Quality settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QualitySettings {
    /// Audio quality preferences
    pub audio_quality: AudioQualitySettings,

    /// Spatial quality preferences
    pub spatial_quality: SpatialQualitySettings,

    /// Adaptive quality settings
    pub adaptive_quality: AdaptiveQualitySettings,

    /// Performance monitoring
    pub performance_monitoring: PerformanceMonitoringSettings,
}

/// Audio quality settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioQualitySettings {
    /// Sample rate (Hz)
    pub sample_rate: u32,

    /// Bit depth
    pub bit_depth: u8,

    /// Channel configuration
    pub channels: ChannelConfiguration,

    /// Dynamic range (dB)
    pub dynamic_range: f32,

    /// THD+N specification
    pub thd_n: f32,
}

/// Channel configurations
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ChannelConfiguration {
    /// Mono
    Mono,

    /// Stereo
    Stereo,

    /// Binaural
    Binaural,

    /// Multi-channel
    MultiChannel(u8),
}

/// Spatial quality settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SpatialQualitySettings {
    /// HRTF quality level
    pub hrtf_quality: HrtfQualityLevel,

    /// Room simulation quality
    pub room_quality: RoomQualityLevel,

    /// Distance modeling precision
    pub distance_precision: DistancePrecisionLevel,

    /// Update rate (Hz)
    pub update_rate: f32,
}

/// HRTF quality levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum HrtfQualityLevel {
    /// Basic HRTF
    Basic,

    /// Standard HRTF
    Standard,

    /// High-quality HRTF
    High,

    /// Ultra HRTF
    Ultra,
}

/// Room quality levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum RoomQualityLevel {
    /// Simple room model
    Simple,

    /// Standard room model
    Standard,

    /// Advanced room model
    Advanced,

    /// Ultra-realistic room model
    UltraRealistic,
}

/// Distance precision levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum DistancePrecisionLevel {
    /// Low precision
    Low,

    /// Medium precision
    Medium,

    /// High precision
    High,

    /// Ultra precision
    Ultra,
}

/// Adaptive quality settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AdaptiveQualitySettings {
    /// Enable adaptive quality
    pub enabled: bool,

    /// Quality adaptation algorithm
    pub algorithm: QualityAdaptationAlgorithm,

    /// Adaptation speed
    pub adaptation_speed: AdaptationSpeed,

    /// Quality bounds
    pub quality_bounds: QualityBounds,

    /// Network condition thresholds
    pub network_thresholds: NetworkThresholds,
}

/// Quality adaptation algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum QualityAdaptationAlgorithm {
    /// Bandwidth-based adaptation
    BandwidthBased,

    /// Latency-based adaptation
    LatencyBased,

    /// Machine learning adaptation
    MachineLearning,

    /// Hybrid adaptation
    Hybrid,
}

/// Adaptation speeds
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AdaptationSpeed {
    /// Slow adaptation
    Slow,

    /// Medium adaptation
    Medium,

    /// Fast adaptation
    Fast,

    /// Instant adaptation
    Instant,
}

/// Quality bounds
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QualityBounds {
    /// Minimum quality level
    pub min_quality: f32,

    /// Maximum quality level
    pub max_quality: f32,

    /// Quality step size
    pub step_size: f32,
}

/// Network condition thresholds
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NetworkThresholds {
    /// Bandwidth thresholds (kbps)
    pub bandwidth_thresholds: Vec<u32>,

    /// Latency thresholds (ms)
    pub latency_thresholds: Vec<u32>,

    /// Packet loss thresholds (percentage)
    pub packet_loss_thresholds: Vec<f32>,

    /// Jitter thresholds (ms)
    pub jitter_thresholds: Vec<f32>,
}

/// Performance monitoring settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceMonitoringSettings {
    /// Enable monitoring
    pub enabled: bool,

    /// Monitoring interval (ms)
    pub interval: u32,

    /// Metrics to collect
    pub metrics: Vec<PerformanceMetric>,

    /// History retention (seconds)
    pub history_retention: u32,
}

/// Performance metrics
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum PerformanceMetric {
    /// Audio latency
    AudioLatency,

    /// Processing latency
    ProcessingLatency,

    /// Network latency
    NetworkLatency,

    /// Packet loss
    PacketLoss,

    /// Jitter
    Jitter,

    /// CPU usage
    CpuUsage,

    /// Memory usage
    MemoryUsage,

    /// Audio quality score
    AudioQuality,

    /// Spatial accuracy
    SpatialAccuracy,
}

/// Privacy settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PrivacySettings {
    /// Data collection preferences
    pub data_collection: DataCollectionSettings,

    /// Recording settings
    pub recording_settings: RecordingSettings,

    /// Anonymization settings
    pub anonymization: AnonymizationSettings,

    /// Consent management
    pub consent_management: ConsentManagementSettings,
}

/// Data collection settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DataCollectionSettings {
    /// Allow telemetry data
    pub telemetry: bool,

    /// Allow analytics data
    pub analytics: bool,

    /// Allow performance data
    pub performance_data: bool,

    /// Allow usage statistics
    pub usage_statistics: bool,

    /// Data retention period (days)
    pub retention_period: u32,
}

/// Recording settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RecordingSettings {
    /// Allow session recording
    pub allow_recording: bool,

    /// Require explicit consent
    pub explicit_consent: bool,

    /// Recording notification
    pub notification_required: bool,

    /// Local recording only
    pub local_only: bool,
}

/// Anonymization settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnonymizationSettings {
    /// Anonymize voice data
    pub voice_anonymization: bool,

    /// Anonymize position data
    pub position_anonymization: bool,

    /// Anonymization method
    pub method: AnonymizationMethod,

    /// Anonymization strength
    pub strength: AnonymizationStrength,
}

/// Anonymization methods
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AnonymizationMethod {
    /// Voice conversion
    VoiceConversion,

    /// Pitch shifting
    PitchShifting,

    /// Spectral masking
    SpectralMasking,

    /// Statistical anonymization
    Statistical,
}

/// Anonymization strengths
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AnonymizationStrength {
    /// Light anonymization
    Light,

    /// Medium anonymization
    Medium,

    /// Strong anonymization
    Strong,

    /// Maximum anonymization
    Maximum,
}

/// Consent management settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConsentManagementSettings {
    /// Require consent for data processing
    pub data_processing_consent: bool,

    /// Require consent for recording
    pub recording_consent: bool,

    /// Require consent for analytics
    pub analytics_consent: bool,

    /// Consent withdrawal mechanism
    pub withdrawal_mechanism: ConsentWithdrawalMechanism,
}

/// Consent withdrawal mechanisms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ConsentWithdrawalMechanism {
    /// Immediate withdrawal
    Immediate,

    /// End of session withdrawal
    EndOfSession,

    /// Manual request
    ManualRequest,

    /// Automatic expiry
    AutomaticExpiry,
}

/// Session join result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionJoinResult {
    /// Success indicator
    pub success: bool,

    /// Session identifier
    pub session_id: String,

    /// User identifier in session
    pub user_session_id: String,

    /// Assigned position
    pub assigned_position: Option<Position3D>,

    /// Session capabilities
    pub capabilities: SessionCapabilities,

    /// Other users in session
    pub other_users: Vec<SessionUser>,

    /// Error message if failed
    pub error_message: Option<String>,
}

/// Session capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionCapabilities {
    /// Maximum users
    pub max_users: usize,

    /// Supported codecs
    pub supported_codecs: Vec<AudioCodec>,

    /// Supported quality levels
    pub quality_levels: Vec<QualityLevel>,

    /// Spatial audio support
    pub spatial_audio: bool,

    /// Recording capability
    pub recording_capable: bool,

    /// Screen sharing support
    pub screen_sharing: bool,
}

/// Session user information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionUser {
    /// User identifier
    pub user_id: String,

    /// Display name
    pub display_name: String,

    /// Current position
    pub position: Position3D,

    /// Current orientation
    pub orientation: Orientation,

    /// User state
    pub state: UserState,

    /// Capabilities
    pub capabilities: UserCapabilities,
}

/// User state in session
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum UserState {
    /// Active and speaking
    Active,

    /// Connected but muted
    Muted,

    /// Away from keyboard
    Away,

    /// Busy/do not disturb
    Busy,

    /// Disconnected
    Disconnected,
}

/// User capabilities
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserCapabilities {
    /// Can speak
    pub can_speak: bool,

    /// Can move
    pub can_move: bool,

    /// Has spatial audio
    pub spatial_audio: bool,

    /// Can record
    pub can_record: bool,

    /// Quality level
    pub quality_level: QualityLevel,
}

/// Audio metadata for transmission
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioMetadata {
    /// Timestamp
    pub timestamp: SystemTime,

    /// Sequence number
    pub sequence: u64,

    /// Audio format
    pub format: AudioFormat,

    /// Spatial information
    pub spatial_info: SpatialAudioInfo,

    /// Quality information
    pub quality_info: QualityInfo,
}

/// Audio format information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioFormat {
    /// Codec used
    pub codec: AudioCodec,

    /// Sample rate
    pub sample_rate: u32,

    /// Channels
    pub channels: u8,

    /// Bitrate
    pub bitrate: u32,

    /// Frame size
    pub frame_size: usize,
}

/// Spatial audio information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SpatialAudioInfo {
    /// Source position
    pub position: Position3D,

    /// Source orientation
    pub orientation: Orientation,

    /// Velocity (for Doppler)
    pub velocity: Option<Velocity>,

    /// Distance from listener
    pub distance: f32,

    /// Spatial quality
    pub spatial_quality: SpatialQualityLevel,
}

/// Velocity vector
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct Velocity {
    /// X component (m/s)
    pub x: f32,

    /// Y component (m/s)
    pub y: f32,

    /// Z component (m/s)
    pub z: f32,
}

/// Quality information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QualityInfo {
    /// Quality score (0.0-1.0)
    pub quality_score: f32,

    /// Estimated latency (ms)
    pub estimated_latency: f32,

    /// Packet loss percentage
    pub packet_loss: f32,

    /// Jitter (ms)
    pub jitter: f32,

    /// Signal-to-noise ratio (dB)
    pub snr: f32,
}

/// Received audio data
#[derive(Debug, Clone)]
pub struct ReceivedAudio {
    /// User identifier
    pub user_id: String,

    /// Audio samples
    pub samples: Vec<f32>,

    /// Metadata
    pub metadata: AudioMetadata,

    /// Reception timestamp
    pub received_at: Instant,

    /// Processing status
    pub processing_status: ProcessingStatus,
}

/// Audio processing status
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ProcessingStatus {
    /// Raw received data
    Raw,

    /// Decoded but not processed
    Decoded,

    /// Spatially processed
    SpatiallyProcessed,

    /// Ready for playback
    ReadyForPlayback,

    /// Processing error
    Error,
}

/// Session state
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionState {
    /// Session identifier
    pub session_id: String,

    /// Session status
    pub status: SessionStatus,

    /// Connected users
    pub connected_users: Vec<String>,

    /// Session start time
    pub start_time: SystemTime,

    /// Session duration
    pub duration: Duration,

    /// Current audio quality
    pub current_quality: QualityLevel,

    /// Network conditions
    pub network_conditions: NetworkConditions,
}

/// Session status
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum SessionStatus {
    /// Initializing
    Initializing,

    /// Active
    Active,

    /// Paused
    Paused,

    /// Reconnecting
    Reconnecting,

    /// Terminated
    Terminated,

    /// Error state
    Error,
}

/// Network conditions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NetworkConditions {
    /// Bandwidth (kbps)
    pub bandwidth: u32,

    /// Round-trip time (ms)
    pub rtt: f32,

    /// Packet loss percentage
    pub packet_loss: f32,

    /// Jitter (ms)
    pub jitter: f32,

    /// Connection quality score
    pub quality_score: f32,
}

/// Session statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionStatistics {
    /// Total data sent (bytes)
    pub data_sent: u64,

    /// Total data received (bytes)
    pub data_received: u64,

    /// Packets sent
    pub packets_sent: u64,

    /// Packets received
    pub packets_received: u64,

    /// Packets lost
    pub packets_lost: u64,

    /// Average latency (ms)
    pub avg_latency: f32,

    /// Peak latency (ms)
    pub peak_latency: f32,

    /// Audio quality statistics
    pub audio_quality_stats: AudioQualityStats,

    /// Spatial audio statistics
    pub spatial_stats: SpatialAudioStats,

    /// Performance statistics
    pub performance_stats: PerformanceStats,
}

/// Audio quality statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AudioQualityStats {
    /// Average quality score
    pub avg_quality: f32,

    /// Minimum quality
    pub min_quality: f32,

    /// Maximum quality
    pub max_quality: f32,

    /// Quality adaptations count
    pub adaptations: u32,

    /// Audio dropouts
    pub dropouts: u32,

    /// Compression efficiency
    pub compression_ratio: f32,
}

/// Spatial audio statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SpatialAudioStats {
    /// Position updates received
    pub position_updates: u64,

    /// Spatial processing accuracy
    pub spatial_accuracy: f32,

    /// HRTF processing efficiency
    pub hrtf_efficiency: f32,

    /// Room simulation performance
    pub room_sim_performance: f32,

    /// Distance calculations performed
    pub distance_calculations: u64,
}

/// Performance statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceStats {
    /// CPU usage average (%)
    pub avg_cpu_usage: f32,

    /// Peak CPU usage (%)
    pub peak_cpu_usage: f32,

    /// Memory usage average (MB)
    pub avg_memory_usage: f32,

    /// Peak memory usage (MB)
    pub peak_memory_usage: f32,

    /// Audio processing time (ms)
    pub audio_processing_time: f32,

    /// Network processing time (ms)
    pub network_processing_time: f32,
}

/// Main telepresence processor
pub struct TelepresenceProcessor {
    /// Configuration
    config: TelepresenceConfig,

    /// Active sessions
    sessions: Arc<RwLock<HashMap<String, Box<dyn TelepresenceSession>>>>,

    /// Audio processing pipeline
    audio_pipeline: AudioProcessingPipeline,

    /// Spatial processing
    spatial_processor: SpatialProcessingPipeline,

    /// Network manager
    network_manager: NetworkManager,

    /// Quality manager
    quality_manager: QualityManager,

    /// Statistics collector
    stats_collector: StatisticsCollector,
}

/// Telepresence configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TelepresenceConfig {
    /// Default user configuration
    pub default_user_config: UserConfig,

    /// Session limits
    pub session_limits: SessionLimits,

    /// Global audio settings
    pub global_audio_settings: GlobalAudioSettings,

    /// Resource limits
    pub resource_limits: ResourceLimits,

    /// Security settings
    pub security_settings: SecuritySettings,
}

/// Session limits
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionLimits {
    /// Maximum concurrent sessions
    pub max_sessions: usize,

    /// Maximum users per session
    pub max_users_per_session: usize,

    /// Maximum session duration (minutes)
    pub max_session_duration: u32,

    /// Session timeout (minutes)
    pub session_timeout: u32,
}

/// Global audio settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GlobalAudioSettings {
    /// Global sample rate
    pub sample_rate: u32,

    /// Global buffer size
    pub buffer_size: usize,

    /// Global quality level
    pub quality_level: QualityLevel,

    /// Default codec
    pub default_codec: AudioCodec,
}

/// Resource limits
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResourceLimits {
    /// Maximum CPU usage (%)
    pub max_cpu_usage: f32,

    /// Maximum memory usage (MB)
    pub max_memory_usage: u64,

    /// Maximum bandwidth per user (kbps)
    pub max_bandwidth_per_user: u32,

    /// Maximum concurrent audio streams
    pub max_audio_streams: usize,
}

/// Security settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SecuritySettings {
    /// Encryption requirements
    pub encryption: EncryptionSettings,

    /// Authentication settings
    pub authentication: AuthenticationSettings,

    /// Rate limiting
    pub rate_limiting: RateLimitingSettings,

    /// Access control
    pub access_control: AccessControlSettings,
}

/// Encryption settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EncryptionSettings {
    /// Require encryption
    pub required: bool,

    /// Encryption algorithm
    pub algorithm: EncryptionAlgorithm,

    /// Key exchange method
    pub key_exchange: KeyExchangeMethod,

    /// Key rotation interval (minutes)
    pub key_rotation_interval: u32,
}

/// Encryption algorithms
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum EncryptionAlgorithm {
    /// AES-256
    AES256,

    /// ChaCha20-Poly1305
    ChaCha20Poly1305,

    /// DTLS-SRTP
    DTLSSRTP,

    /// Custom algorithm
    Custom,
}

/// Key exchange methods
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum KeyExchangeMethod {
    /// Diffie-Hellman
    DiffieHellman,

    /// ECDH
    ECDH,

    /// RSA
    RSA,

    /// Pre-shared key
    PreSharedKey,
}

/// Authentication settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AuthenticationSettings {
    /// Authentication required
    pub required: bool,

    /// Authentication method
    pub method: AuthenticationMethod,

    /// Token expiry (minutes)
    pub token_expiry: u32,

    /// Multi-factor authentication
    pub mfa_required: bool,
}

/// Authentication methods
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AuthenticationMethod {
    /// Username/password
    UsernamePassword,

    /// Token-based
    Token,

    /// Certificate-based
    Certificate,

    /// OAuth
    OAuth,

    /// SAML
    SAML,
}

/// Rate limiting settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RateLimitingSettings {
    /// Enable rate limiting
    pub enabled: bool,

    /// Requests per minute
    pub requests_per_minute: u32,

    /// Bandwidth limit per user (kbps)
    pub bandwidth_limit: u32,

    /// Connection limit per IP
    pub connections_per_ip: u32,
}

/// Access control settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AccessControlSettings {
    /// Whitelist/blacklist mode
    pub mode: AccessControlMode,

    /// Allowed IP ranges
    pub allowed_ips: Vec<String>,

    /// Blocked IP ranges
    pub blocked_ips: Vec<String>,

    /// Geographic restrictions
    pub geo_restrictions: Vec<String>,
}

/// Access control modes
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum AccessControlMode {
    /// Allow all (default)
    AllowAll,

    /// Whitelist only
    Whitelist,

    /// Blacklist
    Blacklist,

    /// Geographic restrictions
    Geographic,
}

// Helper structs for internal processing

struct AudioProcessingPipeline {
    // Audio processing components would be implemented here
}

struct SpatialProcessingPipeline {
    // Spatial processing components would be implemented here
}

struct NetworkManager {
    // Network management components would be implemented here
}

struct QualityManager {
    // Quality management components would be implemented here
}

struct StatisticsCollector {
    // Statistics collection components would be implemented here
}

// Default implementations

impl Default for TelepresenceConfig {
    fn default() -> Self {
        Self {
            default_user_config: UserConfig::default(),
            session_limits: SessionLimits::default(),
            global_audio_settings: GlobalAudioSettings::default(),
            resource_limits: ResourceLimits::default(),
            security_settings: SecuritySettings::default(),
        }
    }
}

impl Default for UserConfig {
    fn default() -> Self {
        Self {
            user_id: "default_user".to_string(),
            display_name: "User".to_string(),
            audio_settings: TelepresenceAudioSettings::default(),
            spatial_settings: SpatialTelepresenceSettings::default(),
            network_settings: NetworkSettings::default(),
            quality_settings: QualitySettings::default(),
            privacy_settings: PrivacySettings::default(),
        }
    }
}

impl Default for TelepresenceAudioSettings {
    fn default() -> Self {
        Self {
            input_device: AudioDeviceConfig::default(),
            output_device: AudioDeviceConfig::default(),
            voice_processing: VoiceProcessingSettings::default(),
            quality_preferences: AudioQualityPreferences::default(),
            codec_preferences: CodecPreferences::default(),
        }
    }
}

impl Default for AudioDeviceConfig {
    fn default() -> Self {
        Self {
            device_id: None,
            sample_rate: 48000,
            buffer_size: 1024,
            channels: 2,
            bit_depth: 16,
            device_settings: HashMap::new(),
        }
    }
}

impl Default for VoiceProcessingSettings {
    fn default() -> Self {
        Self {
            agc_enabled: true,
            noise_suppression: NoiseSuppressionSettings::default(),
            echo_cancellation: EchoCancellationSettings::default(),
            vad_settings: VadSettings::default(),
            enhancement: AudioEnhancementSettings::default(),
            spatialization: VoiceSpatializationSettings::default(),
        }
    }
}

impl Default for NoiseSuppressionSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            strength: 0.7,
            algorithm: NoiseSuppressionAlgorithm::Hybrid,
            adaptive: true,
            stationary_suppression: 0.8,
            non_stationary_suppression: 0.6,
        }
    }
}

impl Default for EchoCancellationSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            strength: 0.8,
            algorithm: EchoCancellationAlgorithm::NLMS,
            tail_length: 1024,
            adaptation_rate: 0.01,
            non_linear_processing: true,
        }
    }
}

impl Default for VadSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            sensitivity: 0.7,
            algorithm: VadAlgorithm::Hybrid,
            min_voice_duration: 100.0,
            min_silence_duration: 200.0,
            hangover_time: 150.0,
        }
    }
}

impl Default for AudioEnhancementSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            dynamic_range_compression: CompressionSettings::default(),
            equalization: EqualizationSettings::default(),
            bandwidth_extension: BandwidthExtensionSettings::default(),
            comfort_noise: ComfortNoiseSettings::default(),
        }
    }
}

impl Default for CompressionSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            ratio: 3.0,
            threshold: -18.0,
            attack_time: 5.0,
            release_time: 50.0,
            makeup_gain: 2.0,
        }
    }
}

impl Default for EqualizationSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            bands: vec![],
            eq_type: EqualizationType::Parametric,
            adaptive: false,
        }
    }
}

impl Default for BandwidthExtensionSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            target_bandwidth: 20000.0,
            algorithm: BandwidthExtensionAlgorithm::SpectralReplication,
            strength: 0.5,
        }
    }
}

impl Default for ComfortNoiseSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            level: -40.0,
            color: NoiseColor::Pink,
            adaptive_level: true,
        }
    }
}

impl Default for VoiceSpatializationSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            hrtf_personalization: HrtfPersonalizationSettings::default(),
            room_simulation: RoomSimulationSettings::default(),
            distance_modeling: DistanceModelingSettings::default(),
            doppler_effects: DopplerEffectsSettings::default(),
        }
    }
}

impl Default for HrtfPersonalizationSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            measurements: None,
            method: PersonalizationMethod::Anthropometric,
            adaptation_strength: 0.5,
        }
    }
}

impl Default for RoomSimulationSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            virtual_room: VirtualRoomParameters::default(),
            acoustic_matching: AcousticMatchingSettings::default(),
            cross_room_interaction: CrossRoomSettings::default(),
        }
    }
}

impl Default for VirtualRoomParameters {
    fn default() -> Self {
        Self {
            dimensions: (8.0, 3.0, 6.0), // 8m x 3m x 6m room
            materials: RoomMaterials::default(),
            layout: RoomLayout::default(),
            acoustic_properties: AcousticProperties::default(),
        }
    }
}

impl Default for RoomMaterials {
    fn default() -> Self {
        Self {
            walls: vec![MaterialProperties::default_wall()],
            floor: MaterialProperties::default_floor(),
            ceiling: MaterialProperties::default_ceiling(),
            objects: vec![],
        }
    }
}

impl MaterialProperties {
    fn default_wall() -> Self {
        Self {
            name: "Drywall".to_string(),
            absorption: vec![
                (125.0, 0.1),
                (250.0, 0.05),
                (500.0, 0.04),
                (1000.0, 0.06),
                (2000.0, 0.07),
                (4000.0, 0.09),
            ],
            scattering: vec![
                (125.0, 0.1),
                (250.0, 0.1),
                (500.0, 0.1),
                (1000.0, 0.1),
                (2000.0, 0.1),
                (4000.0, 0.1),
            ],
            transmission: vec![
                (125.0, 0.01),
                (250.0, 0.005),
                (500.0, 0.002),
                (1000.0, 0.001),
                (2000.0, 0.0005),
                (4000.0, 0.0002),
            ],
        }
    }

    fn default_floor() -> Self {
        Self {
            name: "Carpet".to_string(),
            absorption: vec![
                (125.0, 0.05),
                (250.0, 0.1),
                (500.0, 0.25),
                (1000.0, 0.45),
                (2000.0, 0.65),
                (4000.0, 0.8),
            ],
            scattering: vec![
                (125.0, 0.2),
                (250.0, 0.2),
                (500.0, 0.2),
                (1000.0, 0.2),
                (2000.0, 0.2),
                (4000.0, 0.2),
            ],
            transmission: vec![
                (125.0, 0.01),
                (250.0, 0.01),
                (500.0, 0.01),
                (1000.0, 0.01),
                (2000.0, 0.01),
                (4000.0, 0.01),
            ],
        }
    }

    fn default_ceiling() -> Self {
        Self {
            name: "Acoustic Tile".to_string(),
            absorption: vec![
                (125.0, 0.2),
                (250.0, 0.3),
                (500.0, 0.5),
                (1000.0, 0.7),
                (2000.0, 0.8),
                (4000.0, 0.85),
            ],
            scattering: vec![
                (125.0, 0.15),
                (250.0, 0.15),
                (500.0, 0.15),
                (1000.0, 0.15),
                (2000.0, 0.15),
                (4000.0, 0.15),
            ],
            transmission: vec![
                (125.0, 0.05),
                (250.0, 0.03),
                (500.0, 0.02),
                (1000.0, 0.01),
                (2000.0, 0.005),
                (4000.0, 0.002),
            ],
        }
    }
}

impl Default for RoomLayout {
    fn default() -> Self {
        Self {
            shape: RoomShape::Rectangular,
            openings: vec![],
            furniture: vec![],
            user_positions: vec![],
        }
    }
}

impl Default for AcousticProperties {
    fn default() -> Self {
        Self {
            reverb_time: 0.6, // 600ms reverb time
            early_decay_time: 0.15,
            clarity: 5.0,
            definition: 0.7,
            intimacy_time: 20.0,
            background_noise: -45.0, // -45 dB background noise
        }
    }
}

impl Default for AcousticMatchingSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            algorithm: AcousticMatchingAlgorithm::Direct,
            strength: 0.7,
            real_time_adaptation: false,
        }
    }
}

impl Default for CrossRoomSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            inter_room_attenuation: 20.0, // 20 dB attenuation between rooms
            isolation_level: 0.8,
            shared_spaces: vec![],
        }
    }
}

impl Default for DistanceModelingSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            attenuation_model: AttenuationModel::InverseSquare,
            air_absorption: AirAbsorptionSettings::default(),
            max_distance: 50.0, // 50 meters
            near_field_compensation: true,
        }
    }
}

impl Default for AirAbsorptionSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            temperature: 20.0,  // 20°C
            humidity: 50.0,     // 50% relative humidity
            pressure: 101325.0, // Standard atmospheric pressure
        }
    }
}

impl Default for DopplerEffectsSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            factor_scaling: 1.0,
            max_shift: 500.0, // 500 Hz maximum shift
            smoothing: 0.8,
        }
    }
}

impl Default for AudioQualityPreferences {
    fn default() -> Self {
        Self {
            quality_level: QualityLevel::High,
            adaptive_quality: true,
            latency_priority: LatencyPriority::Medium,
            bandwidth_constraints: BandwidthConstraints::default(),
        }
    }
}

impl Default for BandwidthConstraints {
    fn default() -> Self {
        Self {
            max_bandwidth: 320, // 320 kbps
            min_bandwidth: 32,  // 32 kbps
            adaptive: true,
            measurement_interval: 1000, // 1 second
        }
    }
}

impl Default for CodecPreferences {
    fn default() -> Self {
        let mut codec_settings = HashMap::new();
        codec_settings.insert(
            AudioCodec::Opus,
            CodecSettings {
                bitrate: 128,
                complexity: 8,
                variable_bitrate: true,
                fec: true,
                parameters: HashMap::new(),
            },
        );

        Self {
            preferred_codecs: vec![AudioCodec::Opus, AudioCodec::AAC, AudioCodec::G722],
            codec_settings,
            fallback_behavior: CodecFallbackBehavior::NextPreferred,
        }
    }
}

impl Default for SpatialTelepresenceSettings {
    fn default() -> Self {
        Self {
            spatial_enabled: true,
            spatial_quality: SpatialQualityLevel::Full3D,
            head_tracking: HeadTrackingSettings::default(),
            environmental_awareness: EnvironmentalAwarenessSettings::default(),
            presence_indicators: PresenceIndicatorSettings::default(),
        }
    }
}

impl Default for HeadTrackingSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            tracking_source: TrackingSource::VRHeadset,
            prediction: TrackingPredictionSettings::default(),
            smoothing: TrackingSmoothingSettings::default(),
        }
    }
}

impl Default for TrackingPredictionSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            horizon: 50.0, // 50ms prediction
            algorithm: PredictionAlgorithm::Kalman,
            confidence_threshold: 0.7,
        }
    }
}

impl Default for TrackingSmoothingSettings {
    fn default() -> Self {
        Self {
            position_smoothing: 0.8,
            orientation_smoothing: 0.85,
            velocity_smoothing: 0.7,
            jitter_reduction: 0.9,
        }
    }
}

impl Default for EnvironmentalAwarenessSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            ambient_sharing: AmbientSharingSettings::default(),
            background_noise: BackgroundNoiseSettings::default(),
            acoustic_echo: AcousticEchoSettings::default(),
        }
    }
}

impl Default for AmbientSharingSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            level: 0.3,
            frequency_filtering: FrequencyFilterSettings::default(),
            spatial_processing: true,
        }
    }
}

impl Default for FrequencyFilterSettings {
    fn default() -> Self {
        Self {
            highpass_cutoff: 100.0, // 100 Hz
            lowpass_cutoff: 8000.0, // 8 kHz
            notch_filters: vec![],
        }
    }
}

impl Default for BackgroundNoiseSettings {
    fn default() -> Self {
        Self {
            suppression_level: 0.8,
            adaptive_suppression: true,
            gate_threshold: -40.0, // -40 dB
            noise_profiling: NoiseProfilingSettings::default(),
        }
    }
}

impl Default for NoiseProfilingSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            duration: 5.0,         // 5 seconds
            update_interval: 30.0, // 30 seconds
            adaptation_rate: 0.1,
        }
    }
}

impl Default for AcousticEchoSettings {
    fn default() -> Self {
        Self {
            detection_sensitivity: 0.7,
            suppression_strength: 0.8,
            path_modeling: true,
            nonlinear_processing: true,
        }
    }
}

impl Default for PresenceIndicatorSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            visual_indicators: VisualPresenceSettings::default(),
            audio_indicators: AudioPresenceSettings::default(),
            breathing_room: BreathingRoomSettings::default(),
        }
    }
}

impl Default for VisualPresenceSettings {
    fn default() -> Self {
        Self {
            speaking_indicator: true,
            position_indicator: true,
            attention_indicator: false,
            indicator_style: IndicatorStyle::Standard,
        }
    }
}

impl Default for AudioPresenceSettings {
    fn default() -> Self {
        Self {
            breathing_sounds: false,
            footsteps: false,
            movement_sounds: false,
            presence_level: 0.2,
        }
    }
}

impl Default for BreathingRoomSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            personal_space: 1.0,   // 1 meter
            comfort_distance: 2.0, // 2 meters
            proximity_adjustments: ProximityAdjustments::default(),
        }
    }
}

impl Default for ProximityAdjustments {
    fn default() -> Self {
        Self {
            volume_adjustment: -3.0, // -3 dB for close proximity
            frequency_adjustment: FrequencyResponseAdjustment::default(),
            reverb_adjustment: -0.2,
            intimacy_enhancement: true,
        }
    }
}

impl Default for FrequencyResponseAdjustment {
    fn default() -> Self {
        Self {
            low_freq_adjustment: 0.0,
            mid_freq_adjustment: 1.0,   // Slight mid boost for intimacy
            high_freq_adjustment: -1.0, // Slight high cut for warmth
        }
    }
}

impl Default for NetworkSettings {
    fn default() -> Self {
        Self {
            connection_preferences: ConnectionPreferences::default(),
            qos_settings: QosSettings::default(),
            firewall_settings: FirewallSettings::default(),
            redundancy_settings: RedundancySettings::default(),
        }
    }
}

impl Default for ConnectionPreferences {
    fn default() -> Self {
        Self {
            preferred_type: ConnectionType::Auto,
            allowed_types: vec![
                ConnectionType::P2P,
                ConnectionType::ServerMediated,
                ConnectionType::TurnRelay,
            ],
            timeout: 30000, // 30 seconds
            retry_attempts: 3,
            ipv6_preferred: false,
        }
    }
}

impl Default for QosSettings {
    fn default() -> Self {
        Self {
            dscp_marking: DscpMarking::Voice,
            traffic_shaping: TrafficShapingSettings::default(),
            congestion_control: CongestionControlSettings::default(),
            jitter_buffer: JitterBufferSettings::default(),
        }
    }
}

impl Default for TrafficShapingSettings {
    fn default() -> Self {
        Self {
            enabled: false,
            max_burst: 16384,       // 16 KB
            sustained_rate: 320000, // 320 kbps
            peak_rate: 512000,      // 512 kbps
        }
    }
}

impl Default for CongestionControlSettings {
    fn default() -> Self {
        Self {
            algorithm: CongestionControlAlgorithm::WebRTC,
            initial_bandwidth: 128000, // 128 kbps
            probe_interval: 1000,      // 1 second
            window_size: 4096,
        }
    }
}

impl Default for JitterBufferSettings {
    fn default() -> Self {
        Self {
            min_buffer: 20,    // 20ms
            max_buffer: 200,   // 200ms
            target_buffer: 60, // 60ms
            adaptive: true,
            fast_adaptation: true,
        }
    }
}

impl Default for FirewallSettings {
    fn default() -> Self {
        Self {
            stun_servers: vec![StunServerConfig {
                url: "stun:stun.l.google.com".to_string(),
                port: 19302,
                protocol: StunProtocol::UDP,
            }],
            turn_servers: vec![],
            ice_settings: IceSettings::default(),
            port_range: Some((49152, 65535)),
        }
    }
}

impl Default for IceSettings {
    fn default() -> Self {
        Self {
            gathering_policy: IceGatheringPolicy::All,
            transport_policy: IceTransportPolicy::All,
            candidate_timeout: 10000,  // 10 seconds
            connection_timeout: 30000, // 30 seconds
        }
    }
}

impl Default for RedundancySettings {
    fn default() -> Self {
        Self {
            enabled: false,
            redundancy_type: RedundancyType::ActivePassive,
            backup_connections: 1,
            failover_timeout: 5000, // 5 seconds
        }
    }
}

impl Default for QualitySettings {
    fn default() -> Self {
        Self {
            audio_quality: AudioQualitySettings::default(),
            spatial_quality: SpatialQualitySettings::default(),
            adaptive_quality: AdaptiveQualitySettings::default(),
            performance_monitoring: PerformanceMonitoringSettings::default(),
        }
    }
}

impl Default for AudioQualitySettings {
    fn default() -> Self {
        Self {
            sample_rate: 48000,
            bit_depth: 16,
            channels: ChannelConfiguration::Binaural,
            dynamic_range: 96.0, // 96 dB
            thd_n: 0.01,         // 0.01% THD+N
        }
    }
}

impl Default for SpatialQualitySettings {
    fn default() -> Self {
        Self {
            hrtf_quality: HrtfQualityLevel::High,
            room_quality: RoomQualityLevel::Standard,
            distance_precision: DistancePrecisionLevel::High,
            update_rate: 90.0, // 90 Hz
        }
    }
}

impl Default for AdaptiveQualitySettings {
    fn default() -> Self {
        Self {
            enabled: true,
            algorithm: QualityAdaptationAlgorithm::Hybrid,
            adaptation_speed: AdaptationSpeed::Medium,
            quality_bounds: QualityBounds::default(),
            network_thresholds: NetworkThresholds::default(),
        }
    }
}

impl Default for QualityBounds {
    fn default() -> Self {
        Self {
            min_quality: 0.3,
            max_quality: 1.0,
            step_size: 0.1,
        }
    }
}

impl Default for NetworkThresholds {
    fn default() -> Self {
        Self {
            bandwidth_thresholds: vec![32, 64, 128, 256, 320],
            latency_thresholds: vec![50, 100, 200, 500],
            packet_loss_thresholds: vec![0.5, 1.0, 2.0, 5.0],
            jitter_thresholds: vec![10.0, 20.0, 50.0, 100.0],
        }
    }
}

impl Default for PerformanceMonitoringSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            interval: 1000, // 1 second
            metrics: vec![
                PerformanceMetric::AudioLatency,
                PerformanceMetric::NetworkLatency,
                PerformanceMetric::PacketLoss,
                PerformanceMetric::AudioQuality,
            ],
            history_retention: 300, // 5 minutes
        }
    }
}

impl Default for PrivacySettings {
    fn default() -> Self {
        Self {
            data_collection: DataCollectionSettings::default(),
            recording_settings: RecordingSettings::default(),
            anonymization: AnonymizationSettings::default(),
            consent_management: ConsentManagementSettings::default(),
        }
    }
}

impl Default for DataCollectionSettings {
    fn default() -> Self {
        Self {
            telemetry: false,
            analytics: false,
            performance_data: true,
            usage_statistics: false,
            retention_period: 30, // 30 days
        }
    }
}

impl Default for RecordingSettings {
    fn default() -> Self {
        Self {
            allow_recording: false,
            explicit_consent: true,
            notification_required: true,
            local_only: true,
        }
    }
}

impl Default for AnonymizationSettings {
    fn default() -> Self {
        Self {
            voice_anonymization: false,
            position_anonymization: false,
            method: AnonymizationMethod::VoiceConversion,
            strength: AnonymizationStrength::Medium,
        }
    }
}

impl Default for ConsentManagementSettings {
    fn default() -> Self {
        Self {
            data_processing_consent: true,
            recording_consent: true,
            analytics_consent: false,
            withdrawal_mechanism: ConsentWithdrawalMechanism::Immediate,
        }
    }
}

impl Default for SessionLimits {
    fn default() -> Self {
        Self {
            max_sessions: 100,
            max_users_per_session: 32,
            max_session_duration: 480, // 8 hours
            session_timeout: 30,       // 30 minutes
        }
    }
}

impl Default for GlobalAudioSettings {
    fn default() -> Self {
        Self {
            sample_rate: 48000,
            buffer_size: 1024,
            quality_level: QualityLevel::High,
            default_codec: AudioCodec::Opus,
        }
    }
}

impl Default for ResourceLimits {
    fn default() -> Self {
        Self {
            max_cpu_usage: 80.0,         // 80%
            max_memory_usage: 2048,      // 2 GB
            max_bandwidth_per_user: 320, // 320 kbps
            max_audio_streams: 64,
        }
    }
}

impl Default for SecuritySettings {
    fn default() -> Self {
        Self {
            encryption: EncryptionSettings::default(),
            authentication: AuthenticationSettings::default(),
            rate_limiting: RateLimitingSettings::default(),
            access_control: AccessControlSettings::default(),
        }
    }
}

impl Default for EncryptionSettings {
    fn default() -> Self {
        Self {
            required: true,
            algorithm: EncryptionAlgorithm::DTLSSRTP,
            key_exchange: KeyExchangeMethod::ECDH,
            key_rotation_interval: 60, // 1 hour
        }
    }
}

impl Default for AuthenticationSettings {
    fn default() -> Self {
        Self {
            required: false,
            method: AuthenticationMethod::Token,
            token_expiry: 60, // 1 hour
            mfa_required: false,
        }
    }
}

impl Default for RateLimitingSettings {
    fn default() -> Self {
        Self {
            enabled: true,
            requests_per_minute: 60,
            bandwidth_limit: 320, // 320 kbps
            connections_per_ip: 10,
        }
    }
}

impl Default for AccessControlSettings {
    fn default() -> Self {
        Self {
            mode: AccessControlMode::AllowAll,
            allowed_ips: vec![],
            blocked_ips: vec![],
            geo_restrictions: vec![],
        }
    }
}

// Implementation of main processor

impl TelepresenceProcessor {
    /// Create new telepresence processor
    pub fn new(config: TelepresenceConfig) -> Self {
        Self {
            config,
            sessions: Arc::new(RwLock::new(HashMap::new())),
            audio_pipeline: AudioProcessingPipeline::new(),
            spatial_processor: SpatialProcessingPipeline::new(),
            network_manager: NetworkManager::new(),
            quality_manager: QualityManager::new(),
            stats_collector: StatisticsCollector::new(),
        }
    }

    /// Create new telepresence session
    pub fn create_session(&mut self, session_config: &SessionConfig) -> Result<String> {
        let session_id = generate_session_id();
        // Session creation logic would be implemented here
        Ok(session_id)
    }

    /// Join existing session
    pub fn join_session(
        &mut self,
        session_id: &str,
        user_config: &UserConfig,
    ) -> Result<SessionJoinResult> {
        // Session join logic would be implemented here
        Ok(SessionJoinResult {
            success: true,
            session_id: session_id.to_string(),
            user_session_id: "user_session_123".to_string(),
            assigned_position: Some(Position3D {
                x: 0.0,
                y: 0.0,
                z: 0.0,
            }),
            capabilities: SessionCapabilities {
                max_users: 32,
                supported_codecs: vec![AudioCodec::Opus, AudioCodec::AAC],
                quality_levels: vec![QualityLevel::Medium, QualityLevel::High],
                spatial_audio: true,
                recording_capable: false,
                screen_sharing: false,
            },
            other_users: vec![],
            error_message: None,
        })
    }

    /// Leave session
    pub fn leave_session(&mut self, session_id: &str, user_id: &str) -> Result<()> {
        // Session leave logic would be implemented here
        Ok(())
    }

    /// Process audio frame for telepresence
    pub fn process_audio_frame(
        &mut self,
        session_id: &str,
        user_id: &str,
        audio_samples: &[f32],
        metadata: &AudioMetadata,
    ) -> Result<Vec<ReceivedAudio>> {
        // Audio processing logic would be implemented here
        Ok(vec![])
    }

    /// Update user position in session
    pub fn update_user_position(
        &mut self,
        session_id: &str,
        user_id: &str,
        position: Position3D,
        orientation: Orientation,
    ) -> Result<()> {
        // Position update logic would be implemented here
        Ok(())
    }

    /// Get session statistics
    pub fn get_session_stats(&self, session_id: &str) -> Result<SessionStatistics> {
        // Statistics retrieval logic would be implemented here
        Ok(SessionStatistics {
            data_sent: 0,
            data_received: 0,
            packets_sent: 0,
            packets_received: 0,
            packets_lost: 0,
            avg_latency: 0.0,
            peak_latency: 0.0,
            audio_quality_stats: AudioQualityStats {
                avg_quality: 0.8,
                min_quality: 0.6,
                max_quality: 1.0,
                adaptations: 0,
                dropouts: 0,
                compression_ratio: 4.0,
            },
            spatial_stats: SpatialAudioStats {
                position_updates: 0,
                spatial_accuracy: 0.95,
                hrtf_efficiency: 0.9,
                room_sim_performance: 0.85,
                distance_calculations: 0,
            },
            performance_stats: PerformanceStats {
                avg_cpu_usage: 15.0,
                peak_cpu_usage: 25.0,
                avg_memory_usage: 256.0,
                peak_memory_usage: 512.0,
                audio_processing_time: 5.0,
                network_processing_time: 2.0,
            },
        })
    }

    /// Update configuration
    pub fn update_config(&mut self, config: TelepresenceConfig) {
        self.config = config;
    }
}

// Implementation placeholders for internal components

impl AudioProcessingPipeline {
    fn new() -> Self {
        Self {
            // Initialize audio processing components
        }
    }
}

impl SpatialProcessingPipeline {
    fn new() -> Self {
        Self {
            // Initialize spatial processing components
        }
    }
}

impl NetworkManager {
    fn new() -> Self {
        Self {
            // Initialize network management components
        }
    }
}

impl QualityManager {
    fn new() -> Self {
        Self {
            // Initialize quality management components
        }
    }
}

impl StatisticsCollector {
    fn new() -> Self {
        Self {
            // Initialize statistics collection components
        }
    }
}

// Helper types for session configuration
/// Configuration for telepresence sessions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionConfig {
    /// Session name
    pub name: String,

    /// Session description
    pub description: Option<String>,

    /// Maximum users
    pub max_users: usize,

    /// Session privacy
    pub privacy: SessionPrivacy,

    /// Recording settings
    pub recording: SessionRecordingSettings,

    /// Virtual room settings
    pub virtual_room: Option<VirtualRoomParameters>,
}

/// Session privacy levels
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum SessionPrivacy {
    /// Public session
    Public,

    /// Private session (invite only)
    Private,

    /// Password protected
    PasswordProtected,

    /// Authenticated users only
    AuthenticatedOnly,
}

/// Session recording settings
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SessionRecordingSettings {
    /// Allow recording
    pub allow_recording: bool,

    /// Auto-record session
    pub auto_record: bool,

    /// Recording quality
    pub quality: QualityLevel,

    /// Include video
    pub include_video: bool,
}

// Utility functions

fn generate_session_id() -> String {
    // Generate unique session ID
    format!(
        "session_{}",
        SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_millis()
    )
}

// Tests

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

    #[test]
    fn test_telepresence_config_creation() {
        let config = TelepresenceConfig::default();
        assert_eq!(
            config
                .default_user_config
                .audio_settings
                .input_device
                .sample_rate,
            48000
        );
        assert!(config.security_settings.encryption.required);
    }

    #[test]
    fn test_user_config_creation() {
        let user_config = UserConfig::default();
        assert_eq!(user_config.user_id, "default_user");
        assert!(user_config.audio_settings.voice_processing.agc_enabled);
    }

    #[test]
    fn test_audio_device_config() {
        let device_config = AudioDeviceConfig::default();
        assert_eq!(device_config.sample_rate, 48000);
        assert_eq!(device_config.channels, 2);
        assert_eq!(device_config.buffer_size, 1024);
    }

    #[test]
    fn test_voice_processing_settings() {
        let voice_settings = VoiceProcessingSettings::default();
        assert!(voice_settings.agc_enabled);
        assert!(voice_settings.noise_suppression.enabled);
        assert!(voice_settings.echo_cancellation.enabled);
    }

    #[test]
    fn test_spatial_telepresence_settings() {
        let spatial_settings = SpatialTelepresenceSettings::default();
        assert!(spatial_settings.spatial_enabled);
        assert_eq!(
            spatial_settings.spatial_quality,
            SpatialQualityLevel::Full3D
        );
    }

    #[test]
    fn test_room_simulation_settings() {
        let room_settings = RoomSimulationSettings::default();
        assert!(room_settings.enabled);
        assert_eq!(room_settings.virtual_room.dimensions, (8.0, 3.0, 6.0));
    }

    #[test]
    fn test_telepresence_processor_creation() {
        let config = TelepresenceConfig::default();
        let processor = TelepresenceProcessor::new(config);
        // Basic creation test - more functionality would be tested with actual implementation
    }

    #[test]
    fn test_session_join_result() {
        let join_result = SessionJoinResult {
            success: true,
            session_id: "test_session".to_string(),
            user_session_id: "user_123".to_string(),
            assigned_position: Some(Position3D {
                x: 0.0,
                y: 0.0,
                z: 0.0,
            }),
            capabilities: SessionCapabilities {
                max_users: 32,
                supported_codecs: vec![AudioCodec::Opus],
                quality_levels: vec![QualityLevel::High],
                spatial_audio: true,
                recording_capable: false,
                screen_sharing: false,
            },
            other_users: vec![],
            error_message: None,
        };

        assert!(join_result.success);
        assert_eq!(join_result.session_id, "test_session");
    }

    #[test]
    fn test_codec_preferences() {
        let codec_prefs = CodecPreferences::default();
        assert_eq!(codec_prefs.preferred_codecs[0], AudioCodec::Opus);
        assert_eq!(
            codec_prefs.fallback_behavior,
            CodecFallbackBehavior::NextPreferred
        );
    }

    #[test]
    fn test_network_settings() {
        let network_settings = NetworkSettings::default();
        assert_eq!(
            network_settings.connection_preferences.preferred_type,
            ConnectionType::Auto
        );
        assert!(network_settings.qos_settings.jitter_buffer.adaptive);
    }

    #[test]
    fn test_quality_adaptation() {
        let adaptive_settings = AdaptiveQualitySettings::default();
        assert!(adaptive_settings.enabled);
        assert_eq!(
            adaptive_settings.algorithm,
            QualityAdaptationAlgorithm::Hybrid
        );
        assert_eq!(adaptive_settings.adaptation_speed, AdaptationSpeed::Medium);
    }
}