voirs-spatial 0.1.0-rc.1

//! ARCore Platform Integration
//!
//! This module provides integration with Google's ARCore framework for Android devices,
//! enabling AR head tracking, environmental understanding, and anchoring.

use crate::platforms::{
    DeviceInfo, EyeTrackingData, HandTrackingData, PlatformCapabilities, PlatformIntegration,
    PlatformTrackingData, PoseData, TrackingConfig, TrackingQuality, TrackingState,
};
use crate::position::{PlatformData, PlatformType};
use crate::types::Position3D;
use crate::{Error, Result};
use async_trait::async_trait;
use std::collections::HashMap;
use tokio::time::Instant;

/// ARCore platform integration for Android devices
pub struct ARCorePlatform {
    device_info: DeviceInfo,
    capabilities: PlatformCapabilities,
    tracking_active: bool,
    config: TrackingConfig,

    // ARCore-specific state
    session_active: bool,
    environmental_understanding: bool,
    cloud_anchors_enabled: bool,
    instant_placement_enabled: bool,

    // Android device information
    device_tier: AndroidDeviceTier,
    last_update: Option<Instant>,
}

/// Android device performance tiers for ARCore
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum AndroidDeviceTier {
    /// High-end devices (Flagship phones, latest processors)
    HighEnd,
    /// Mid-range devices (Good AR performance)
    MidRange,
    /// Entry-level devices (Basic AR support)
    EntryLevel,
    /// Unsupported devices
    Unsupported,
}

impl ARCorePlatform {
    /// Create new ARCore platform integration
    pub fn new() -> Self {
        Self {
            device_info: DeviceInfo {
                name: "ARCore Device".to_string(),
                manufacturer: "Google".to_string(),
                model: "Android Device".to_string(),
                serial_number: "Unknown".to_string(),
                firmware_version: "Unknown".to_string(),
                platform_version: "Unknown".to_string(),
            },
            capabilities: PlatformCapabilities {
                head_tracking_6dof: true,
                hand_tracking: false, // Limited support in ARCore
                eye_tracking: false,  // Not supported
                controller_tracking: false,
                room_scale: true,  // Environmental understanding
                passthrough: true, // AR by nature
                refresh_rates: vec![60.0, 90.0, 120.0], // Android display refresh rates
                tracking_range: 50.0, // Good AR range
            },
            tracking_active: false,
            config: TrackingConfig::default(),
            session_active: false,
            environmental_understanding: false,
            cloud_anchors_enabled: false,
            instant_placement_enabled: false,
            device_tier: AndroidDeviceTier::Unsupported,
            last_update: None,
        }
    }

    /// Initialize ARCore session
    async fn init_arcore_session(&mut self) -> Result<()> {
        #[cfg(target_os = "android")]
        {
            self.check_arcore_availability().await?;
            self.detect_device_tier().await?;
            self.setup_session_configuration().await?;
            self.session_active = true;
            self.last_update = Some(Instant::now());
            tracing::info!("ARCore session initialized successfully");
        }

        #[cfg(not(target_os = "android"))]
        {
            tracing::warn!("ARCore is only available on Android devices");
            Err(Error::LegacyConfig(
                "ARCore not available on this platform".to_string(),
            ))
        }
    }

    /// Check if ARCore is available on this device
    async fn check_arcore_availability(&self) -> Result<()> {
        // In a real implementation, this would:
        // 1. Check if ARCore services are installed
        // 2. Verify device compatibility
        // 3. Check camera permissions
        // 4. Validate OpenGL ES version

        #[cfg(target_os = "android")]
        {
            // Simulate ARCore availability check
            tracing::info!("Checking ARCore availability on Android device");
            // Would use ArCoreApk_checkAvailability() and related APIs
        }

        Ok(())
    }

    /// Detect Android device performance tier
    async fn detect_device_tier(&mut self) -> Result<()> {
        // In a real implementation, this would check:
        // - Device hardware specifications
        // - Processor type and generation
        // - RAM amount
        // - GPU capabilities
        // - Camera sensor quality

        #[cfg(target_os = "android")]
        {
            // Simulate device tier detection
            use scirs2_core::random::Rng;
            let mut rng = scirs2_core::random::thread_rng();
            self.device_tier = match rng.random_range(0..4) {
                0 => AndroidDeviceTier::HighEnd,
                1 => AndroidDeviceTier::MidRange,
                2 => AndroidDeviceTier::EntryLevel,
                _ => AndroidDeviceTier::Unsupported,
            };

            // Update capabilities based on device tier
            match self.device_tier {
                AndroidDeviceTier::HighEnd => {
                    self.device_info.model = "High-end Android Device".to_string();
                    self.capabilities.tracking_range = 100.0;
                    self.capabilities.refresh_rates = vec![60.0, 90.0, 120.0];
                    self.environmental_understanding = true;
                    self.cloud_anchors_enabled = true;
                    self.instant_placement_enabled = true;
                }
                AndroidDeviceTier::MidRange => {
                    self.device_info.model = "Mid-range Android Device".to_string();
                    self.capabilities.tracking_range = 50.0;
                    self.capabilities.refresh_rates = vec![60.0, 90.0];
                    self.environmental_understanding = true;
                    self.cloud_anchors_enabled = false; // May be too resource intensive
                    self.instant_placement_enabled = true;
                }
                AndroidDeviceTier::EntryLevel => {
                    self.device_info.model = "Entry-level Android Device".to_string();
                    self.capabilities.tracking_range = 20.0;
                    self.capabilities.refresh_rates = vec![60.0];
                    self.environmental_understanding = false;
                    self.cloud_anchors_enabled = false;
                    self.instant_placement_enabled = true;
                }
                AndroidDeviceTier::Unsupported => {
                    return Err(Error::LegacyConfig(
                        "Device not supported by ARCore".to_string(),
                    ));
                }
            }

            tracing::info!("Detected Android device tier: {:?}", self.device_tier);
        }

        #[cfg(not(target_os = "android"))]
        {
            self.device_tier = AndroidDeviceTier::Unsupported;
        }

        Ok(())
    }

    /// Setup ARCore session configuration
    async fn setup_session_configuration(&mut self) -> Result<()> {
        // In a real implementation, this would:
        // 1. Create ArSession with ArSessionConfig
        // 2. Configure tracking mode (orientation vs. position)
        // 3. Set up plane finding modes
        // 4. Configure light estimation
        // 5. Enable cloud anchors if supported

        tracing::info!("Setting up ARCore session configuration");
        self.device_info.platform_version = "ARCore 1.30+".to_string();

        Ok(())
    }

    /// Get simulated ARCore tracking data
    fn get_simulated_tracking(&self) -> PlatformTrackingData {
        let now = Instant::now();
        let time = now.elapsed().as_secs_f32();

        // Simulate Android device movement in AR space
        // Android devices tend to have more varied usage patterns
        let position = Position3D::new(
            (time * 0.03).sin() * 1.5,  // Natural hand movement
            1.5,                        // Phone height (slightly lower than iOS)
            (time * 0.025).cos() * 2.0, // Exploration movement
        );

        // Simulate device orientation changes (more dramatic than iOS due to varied usage)
        let yaw = (time * 0.02).sin() * 0.4;
        let pitch = (time * 0.018).cos() * 0.2;
        let roll = (time * 0.012).sin() * 0.1; // Android devices more likely to be tilted

        // Convert to quaternion
        let half_yaw = yaw * 0.5;
        let half_pitch = pitch * 0.5;
        let half_roll = roll * 0.5;

        let cos_yaw = half_yaw.cos();
        let sin_yaw = half_yaw.sin();
        let cos_pitch = half_pitch.cos();
        let sin_pitch = half_pitch.sin();
        let cos_roll = half_roll.cos();
        let sin_roll = half_roll.sin();

        // Full 3D rotation combining yaw, pitch, and roll
        let orientation = (
            sin_roll * cos_pitch * cos_yaw - cos_roll * sin_pitch * sin_yaw,
            cos_roll * sin_pitch * cos_yaw + sin_roll * cos_pitch * sin_yaw,
            cos_roll * cos_pitch * sin_yaw - sin_roll * sin_pitch * cos_yaw,
            cos_roll * cos_pitch * cos_yaw + sin_roll * sin_pitch * sin_yaw,
        );

        let head_pose = PoseData {
            position,
            orientation,
            linear_velocity: Position3D::new(0.0, 0.0, 0.0),
            angular_velocity: Position3D::new(roll * 0.1, yaw * 0.1, pitch * 0.1),
            confidence: match self.device_tier {
                AndroidDeviceTier::HighEnd => 0.92,
                AndroidDeviceTier::MidRange => 0.85,
                AndroidDeviceTier::EntryLevel => 0.75,
                AndroidDeviceTier::Unsupported => 0.50,
            },
        };

        // Calculate tracking quality with environmental factors
        let base_quality = match self.device_tier {
            AndroidDeviceTier::HighEnd => 0.90,
            AndroidDeviceTier::MidRange => 0.80,
            AndroidDeviceTier::EntryLevel => 0.70,
            AndroidDeviceTier::Unsupported => 0.40,
        };

        // Simulate lighting and environmental conditions affecting tracking
        let lighting_factor = (time * 0.05).sin() * 0.1 + 0.9; // 0.8 to 1.0
        let motion_factor = if time % 10.0 < 5.0 { 1.0 } else { 0.85 }; // Simulate motion blur
        let final_quality = base_quality * lighting_factor * motion_factor;

        PlatformTrackingData {
            head_pose,
            left_controller: None, // ARCore doesn't use controllers
            right_controller: None,
            quality: TrackingQuality {
                overall_quality: final_quality,
                position_quality: final_quality * 0.95,
                orientation_quality: final_quality * 1.05,
                feature_count: match self.device_tier {
                    AndroidDeviceTier::HighEnd => 250,
                    AndroidDeviceTier::MidRange => 150,
                    AndroidDeviceTier::EntryLevel => 80,
                    AndroidDeviceTier::Unsupported => 30,
                },
                state: if final_quality > 0.75 {
                    TrackingState::Full
                } else if final_quality > 0.5 {
                    TrackingState::Limited
                } else {
                    TrackingState::Lost
                },
            },
            timestamp: now,
            raw_data: PlatformData {
                device_id: "ARCore".to_string(),
                pose_data: vec![],
                tracking_confidence: final_quality,
                platform_timestamp: 0,
                properties: {
                    let mut props = HashMap::new();
                    props.insert("device_tier".to_string(), format!("{:?}", self.device_tier));
                    props.insert(
                        "environmental_understanding".to_string(),
                        self.environmental_understanding.to_string(),
                    );
                    props.insert(
                        "cloud_anchors".to_string(),
                        self.cloud_anchors_enabled.to_string(),
                    );
                    props.insert(
                        "instant_placement".to_string(),
                        self.instant_placement_enabled.to_string(),
                    );
                    props
                },
            },
        }
    }
}

#[async_trait]
impl PlatformIntegration for ARCorePlatform {
    async fn initialize(&mut self) -> Result<()> {
        self.init_arcore_session().await
    }

    async fn get_tracking_data(&self) -> Result<PlatformTrackingData> {
        if !self.tracking_active || !self.session_active {
            return Err(Error::LegacyProcessing(
                "ARCore tracking not active".to_string(),
            ));
        }

        Ok(self.get_simulated_tracking())
    }

    async fn is_available(&self) -> bool {
        #[cfg(target_os = "android")]
        {
            self.session_active && !matches!(self.device_tier, AndroidDeviceTier::Unsupported)
        }

        #[cfg(not(target_os = "android"))]
        {
            false
        }
    }

    fn get_capabilities(&self) -> PlatformCapabilities {
        self.capabilities.clone()
    }

    async fn configure_tracking(&mut self, config: TrackingConfig) -> Result<()> {
        self.config = config;
        tracing::info!("Configured ARCore tracking with config: {:?}", self.config);
        Ok(())
    }

    fn get_device_info(&self) -> DeviceInfo {
        self.device_info.clone()
    }

    async fn start_tracking(&mut self) -> Result<()> {
        if !self.session_active {
            return Err(Error::LegacyProcessing(
                "ARCore session not initialized".to_string(),
            ));
        }

        self.tracking_active = true;
        self.last_update = Some(Instant::now());
        tracing::info!("Started ARCore tracking");
        Ok(())
    }

    async fn stop_tracking(&mut self) -> Result<()> {
        self.tracking_active = false;
        tracing::info!("Stopped ARCore tracking");
        Ok(())
    }

    async fn get_hand_tracking(&self) -> Result<Option<HandTrackingData>> {
        // ARCore has limited hand tracking support
        // Would require MediaPipe or similar solutions
        Ok(None)
    }

    async fn get_eye_tracking(&self) -> Result<Option<EyeTrackingData>> {
        // ARCore doesn't support eye tracking
        Ok(None)
    }
}

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

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

    #[tokio::test]
    async fn test_arcore_platform_creation() {
        let platform = ARCorePlatform::new();
        assert!(!platform.tracking_active);
        assert!(!platform.session_active);
        assert_eq!(platform.device_info.manufacturer, "Google");
        assert_eq!(platform.device_tier, AndroidDeviceTier::Unsupported);
    }

    #[tokio::test]
    async fn test_arcore_capabilities() {
        let platform = ARCorePlatform::new();
        let capabilities = platform.get_capabilities();

        assert!(capabilities.head_tracking_6dof);
        assert!(capabilities.room_scale);
        assert!(capabilities.passthrough); // AR by nature
        assert!(!capabilities.controller_tracking); // No controllers
        assert!(!capabilities.hand_tracking); // Limited support
        assert!(!capabilities.eye_tracking); // Not supported
    }

    #[cfg(target_os = "android")]
    #[tokio::test]
    async fn test_arcore_initialization_android() {
        let mut platform = ARCorePlatform::new();
        let result = platform.initialize().await;

        // May succeed or fail depending on simulated device tier
        if result.is_ok() {
            assert!(platform.session_active);
            assert_ne!(platform.device_tier, AndroidDeviceTier::Unsupported);
        }
    }

    #[cfg(not(target_os = "android"))]
    #[tokio::test]
    async fn test_arcore_initialization_non_android() {
        let mut platform = ARCorePlatform::new();
        let result = platform.initialize().await;

        // Should fail on non-Android platforms
        assert!(result.is_err());
        assert!(!platform.is_available().await);
    }

    #[tokio::test]
    async fn test_device_tier_capabilities() {
        let mut platform = ARCorePlatform::new();

        // Test high-end device - manually configure capabilities
        platform.device_tier = AndroidDeviceTier::HighEnd;
        platform.capabilities.tracking_range = 100.0;
        platform.environmental_understanding = true;
        platform.cloud_anchors_enabled = true;

        assert!(platform.capabilities.tracking_range >= 50.0);
        assert!(platform.environmental_understanding);
        assert!(platform.cloud_anchors_enabled);

        // Test entry-level device - manually configure capabilities
        platform.device_tier = AndroidDeviceTier::EntryLevel;
        platform.capabilities.tracking_range = 20.0;
        platform.environmental_understanding = false;
        platform.cloud_anchors_enabled = false;

        assert!(platform.capabilities.tracking_range <= 50.0);
        assert!(!platform.environmental_understanding);
        assert!(!platform.cloud_anchors_enabled);
    }

    #[tokio::test]
    async fn test_tracking_simulation() {
        let mut platform = ARCorePlatform::new();
        platform.device_tier = AndroidDeviceTier::MidRange;
        platform.session_active = true;
        platform.tracking_active = true;
        platform.last_update = Some(Instant::now());

        let tracking_data = platform.get_simulated_tracking();

        // Check tracking quality for mid-range device
        assert!(tracking_data.quality.overall_quality > 0.6);
        assert!(tracking_data.quality.overall_quality < 0.95); // Should be lower than VR
        assert!(tracking_data.quality.feature_count > 50);

        // Check that environmental properties are set
        let props = &tracking_data.raw_data.properties;
        assert!(props.contains_key("device_tier"));
        assert!(props.contains_key("environmental_understanding"));
    }

    #[tokio::test]
    async fn test_configuration() {
        let mut platform = ARCorePlatform::new();
        let config = TrackingConfig {
            enable_prediction: true,
            prediction_time_ms: 25.0, // Higher latency for mobile AR
            position_smoothing: 0.3,  // More smoothing for mobile
            orientation_smoothing: 0.2,
            enable_hand_tracking: false, // Not well supported
            enable_eye_tracking: false,  // Not supported
            target_refresh_rate: 60.0,   // Conservative for mobile
        };

        assert!(platform.configure_tracking(config.clone()).await.is_ok());
        assert_eq!(platform.config.prediction_time_ms, 25.0);
        assert!(!platform.config.enable_hand_tracking);
    }
}