rfann 0.1.0

//! WASM GPU Bridge for browser deployment of rfann with WebGPU acceleration
//!
//! Note: This module is currently not fully functional due to WebGPU types
//! not being available in web-sys. This is a placeholder for future implementation.
//!
//! This module provides the essential bridge between WebAssembly runtime and WebGPU,
//! enabling rfann neural networks to run with GPU acceleration in web browsers.
//!
//! Features:
//! - JavaScript ↔ Rust WebGPU interface bridging
//! - Zero-copy memory management where possible
//! - Browser-specific optimizations and fallbacks
//! - Cross-origin resource sharing (CORS) compliance

use crate::webgpu::{BackendCapabilities, ComputeError, MemoryStats};
use crate::ActivationFunction;
use num_traits::Float;
use std::cell::RefCell;
use std::collections::HashMap;
use std::rc::Rc;
use std::sync::{Arc, Mutex, RwLock};

#[cfg(target_arch = "wasm32")]
use wasm_bindgen::prelude::*;

#[cfg(target_arch = "wasm32")]
use wasm_bindgen_futures::JsFuture;

#[cfg(target_arch = "wasm32")]
use js_sys::{Array, Float32Array, Float64Array, Object, Promise, Uint8Array};

#[cfg(target_arch = "wasm32")]
use web_sys::{
    console, BroadcastChannel, Document, Element, HtmlCanvasElement, MessageChannel, MessagePort,
    Navigator, Performance, ServiceWorkerContainer, Window, Worker,
};

// WebGPU types - conditionally compiled when available
#[cfg(all(target_arch = "wasm32", feature = "webgpu"))]
use web_sys::{
    Gpu, GpuAdapter, GpuBindGroup, GpuBuffer, GpuCanvasContext, GpuCommandEncoder,
    GpuComputePassEncoder, GpuComputePipeline, GpuDevice, GpuQueue, GpuTexture,
};

/// WASM GPU Bridge - Main interface for browser WebGPU integration
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
pub struct WasmGpuBridge {
    inner: Arc<RwLock<WasmGpuBridgeInner>>,
}

#[cfg(target_arch = "wasm32")]
pub struct WasmGpuBridgeInner {
    gpu_context: Option<WebGpuContext>,
    memory_manager: WasmMemoryManager,
    performance_monitor: WasmPerformanceMonitor,
    browser_compatibility: BrowserCompatibility,
    cross_origin_manager: CrossOriginManager,
}

/// WebGPU context management for WASM environment
#[cfg(target_arch = "wasm32")]
pub struct WebGpuContext {
    gpu: Gpu,
    adapter: GpuAdapter,
    device: GpuDevice,
    queue: GpuQueue,
    canvas_context: Option<GpuCanvasContext>,
    capabilities: WebGpuCapabilities,
    feature_level: WebGpuFeatureLevel,
}

/// WASM-specific memory management with efficient JS ↔ Rust transfers
#[cfg(target_arch = "wasm32")]
pub struct WasmMemoryManager {
    shared_buffers: HashMap<String, SharedBuffer>,
    memory_pools: Vec<MemoryPool>,
    js_heap_monitor: JsHeapMonitor,
    gc_coordinator: GcCoordinator,
    zero_copy_regions: Vec<ZeroCopyRegion>,
}

/// Performance monitoring adapted for browser environment
#[cfg(target_arch = "wasm32")]
pub struct WasmPerformanceMonitor {
    performance_api: Performance,
    gpu_timing_queries: Vec<GpuTimingQuery>,
    memory_usage_tracker: MemoryUsageTracker,
    frame_rate_monitor: Option<FrameRateMonitor>,
    battery_monitor: Option<BatteryMonitor>,
}

/// Browser compatibility and feature detection
#[cfg(target_arch = "wasm32")]
pub struct BrowserCompatibility {
    browser_type: BrowserType,
    webgpu_support_level: WebGpuSupportLevel,
    fallback_strategies: Vec<FallbackStrategy>,
    polyfill_manager: PolyfillManager,
    version_specific_optimizations: HashMap<String, OptimizationSet>,
}

/// Cross-origin resource management
#[cfg(target_arch = "wasm32")]
pub struct CrossOriginManager {
    cors_policies: CorsPolicy,
    csp_compliance: CspCompliance,
    shared_array_buffer_support: bool,
    worker_security_context: WorkerSecurityContext,
}

/// Shared buffer for efficient data transfer
#[cfg(target_arch = "wasm32")]
pub struct SharedBuffer {
    js_buffer: Float32Array,
    rust_view: Vec<f32>,
    is_shared: bool,
    last_sync: f64,
    sync_direction: SyncDirection,
}

/// Memory pool for WASM heap optimization
#[cfg(target_arch = "wasm32")]
pub struct MemoryPool {
    pool_id: String,
    block_size: usize,
    total_blocks: usize,
    free_blocks: Vec<usize>,
    allocated_blocks: HashMap<String, usize>,
    pool_type: PoolType,
}

/// JavaScript heap monitoring
#[cfg(target_arch = "wasm32")]
pub struct JsHeapMonitor {
    memory_api: Option<js_sys::Object>,
    last_gc_time: f64,
    heap_size_history: Vec<(f64, usize)>,
    pressure_threshold: usize,
    gc_frequency_ms: f64,
}

/// Garbage collection coordination
#[cfg(target_arch = "wasm32")]
pub struct GcCoordinator {
    auto_gc_enabled: bool,
    gc_pressure_threshold: f64,
    manual_gc_trigger: Option<js_sys::Function>,
    gc_timing_strategy: GcTimingStrategy,
}

/// Zero-copy memory regions for large data transfers
#[cfg(target_arch = "wasm32")]
pub struct ZeroCopyRegion {
    js_array_buffer: js_sys::ArrayBuffer,
    rust_slice: *mut f32,
    size_bytes: usize,
    is_mutable: bool,
    reference_count: usize,
}

/// GPU timing query for performance measurement
#[cfg(target_arch = "wasm32")]
pub struct GpuTimingQuery {
    query_set: web_sys::GpuQuerySet,
    query_buffer: GpuBuffer,
    query_index: u32,
    timestamp_period: f64,
}

/// Memory usage tracking for browser environment
#[cfg(target_arch = "wasm32")]
pub struct MemoryUsageTracker {
    performance_memory: Option<js_sys::Object>,
    heap_snapshots: Vec<HeapSnapshot>,
    wasm_memory_usage: usize,
    js_memory_usage: usize,
    gpu_memory_usage: usize,
}

/// Frame rate monitoring for rendering applications
#[cfg(target_arch = "wasm32")]
pub struct FrameRateMonitor {
    animation_frame_id: Option<i32>,
    frame_times: Vec<f64>,
    target_fps: f64,
    performance_budget: f64,
}

/// Battery monitoring for mobile optimization
#[cfg(target_arch = "wasm32")]
pub struct BatteryMonitor {
    battery_api: Option<js_sys::Object>,
    charging_state: bool,
    battery_level: f64,
    power_optimization_mode: PowerOptimizationMode,
}

// Type definitions and enums
#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum BrowserType {
    Chrome,
    Firefox,
    Safari,
    Edge,
    Unknown(String),
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum WebGpuSupportLevel {
    Full,
    Partial,
    Experimental,
    None,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum WebGpuFeatureLevel {
    WebGpu1_0,
    WebGpu2_0,
    Experimental,
    Fallback,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct WebGpuCapabilities {
    max_texture_dimension_1d: u32,
    max_texture_dimension_2d: u32,
    max_texture_dimension_3d: u32,
    max_buffer_size: u64,
    max_compute_workgroup_size_x: u32,
    max_compute_workgroup_size_y: u32,
    max_compute_workgroup_size_z: u32,
    max_compute_workgroups_per_dimension: u32,
    max_compute_invocations_per_workgroup: u32,
    supports_timestamp_queries: bool,
    supports_pipeline_statistics: bool,
    supports_storage_textures: bool,
    adapter_info: AdapterInfo,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct AdapterInfo {
    vendor: String,
    architecture: String,
    device: String,
    description: String,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum SyncDirection {
    JsToRust,
    RustToJs,
    Bidirectional,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum PoolType {
    Vertex,
    Index,
    Uniform,
    Storage,
    Texture,
    Staging,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum GcTimingStrategy {
    Immediate,
    Deferred,
    FrameBased,
    IdleBased,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct WebTask {
    task_id: String,
    task_type: String,
    data: js_sys::Object,
    priority: u32,
    timeout_ms: Option<u32>,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct WorkerPerformanceMetrics {
    tasks_completed: u32,
    average_execution_time_ms: f64,
    error_rate: f64,
    memory_usage_mb: f64,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum CacheStrategy {
    CacheFirst,
    NetworkFirst,
    CacheOnly,
    NetworkOnly,
    StaleWhileRevalidate,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct OfflineCapabilities {
    can_run_offline: bool,
    cached_models: Vec<String>,
    offline_storage_mb: u64,
    sync_strategies: Vec<SyncStrategy>,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum SyncStrategy {
    Immediate,
    Periodic,
    OnConnection,
    Manual,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct BackgroundSyncManager {
    sync_registrations: Vec<String>,
    pending_syncs: Vec<PendingSync>,
    retry_strategy: RetryStrategy,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct PendingSync {
    sync_id: String,
    data: js_sys::Object,
    retry_count: u32,
    next_retry: f64,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum RetryStrategy {
    Linear,
    Exponential,
    Fibonacci,
    Custom(js_sys::Function),
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct TabInfo {
    tab_id: String,
    last_heartbeat: f64,
    capabilities: TabCapabilities,
    role: TabRole,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct TabCapabilities {
    has_webgpu: bool,
    memory_limit_mb: u64,
    is_focused: bool,
    battery_saver_mode: bool,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum TabRole {
    Leader,
    Worker,
    Observer,
    Backup,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum CoordinationProtocol {
    LeaderFollower,
    Distributed,
    Hierarchical,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct TabConflictResolver {
    resolution_strategy: ConflictResolutionStrategy,
    timeout_ms: u32,
    fallback_to_local: bool,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum ConflictResolutionStrategy {
    Timestamp,
    Priority,
    Voting,
    Arbitrary,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct StorageQuota {
    total_quota_mb: u64,
    used_quota_mb: u64,
    can_request_persistent: bool,
    estimate_api_available: bool,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct WebMessage {
    message_id: String,
    from: String,
    to: String,
    message_type: String,
    data: js_sys::Object,
    timestamp: f64,
    priority: u32,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct DeliveryGuarantees {
    retry_count: u32,
    timeout_ms: u32,
    require_acknowledgment: bool,
    ordering_required: bool,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct HeapSnapshot {
    timestamp: f64,
    total_heap_size: usize,
    used_heap_size: usize,
    heap_size_limit: usize,
    number_of_native_contexts: u32,
    number_of_detached_contexts: u32,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum PowerOptimizationMode {
    HighPerformance,
    Balanced,
    PowerSaver,
    Automatic,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct FallbackStrategy {
    condition: FallbackCondition,
    target_backend: String,
    performance_threshold: f64,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone, PartialEq)]
pub enum FallbackCondition {
    WebGpuUnavailable,
    PerformanceBelowThreshold,
    MemoryPressure,
    BatteryLow,
    ThermalThrottling,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct PolyfillManager {
    active_polyfills: Vec<String>,
    polyfill_registry: HashMap<String, js_sys::Function>,
    feature_detection: FeatureDetection,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct FeatureDetection {
    webgpu_available: bool,
    shared_array_buffer_available: bool,
    bigint_available: bool,
    atomics_available: bool,
    wasm_simd_available: bool,
    wasm_threads_available: bool,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct OptimizationSet {
    memory_optimizations: Vec<String>,
    compute_optimizations: Vec<String>,
    rendering_optimizations: Vec<String>,
    power_optimizations: Vec<String>,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct CorsPolicy {
    allowed_origins: Vec<String>,
    credentials_required: bool,
    max_age: u32,
    allowed_methods: Vec<String>,
    allowed_headers: Vec<String>,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct CspCompliance {
    script_src_policy: String,
    worker_src_policy: String,
    connect_src_policy: String,
    wasm_eval_allowed: bool,
    unsafe_eval_allowed: bool,
}

#[cfg(target_arch = "wasm32")]
#[derive(Debug, Clone)]
pub struct WorkerSecurityContext {
    same_origin_policy: bool,
    cors_enabled: bool,
    trusted_origins: Vec<String>,
    message_integrity_check: bool,
}

// Implementation for WASM environment
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
impl WasmGpuBridge {
    /// Create a new WASM GPU bridge instance
    #[wasm_bindgen(constructor)]
    pub fn new() -> Result<WasmGpuBridge, JsValue> {
        console::log_1(&"Initializing WASM GPU Bridge".into());

        let inner = WasmGpuBridgeInner {
            gpu_context: None,
            memory_manager: WasmMemoryManager::new()?,
            performance_monitor: WasmPerformanceMonitor::new()?,
            browser_compatibility: BrowserCompatibility::detect()?,
            cross_origin_manager: CrossOriginManager::new()?,
        };

        Ok(WasmGpuBridge {
            inner: Arc::new(RwLock::new(inner)),
        })
    }

    /// Initialize WebGPU context from JavaScript
    #[wasm_bindgen]
    #[cfg(feature = "webgpu")]
    pub async fn initialize_webgpu(&self, canvas_id: Option<String>) -> Result<(), JsValue> {
        let window = web_sys::window().ok_or("No window object")?;
        let navigator = window.navigator();

        // Get GPU interface using Reflect
        let gpu = js_sys::Reflect::get(&navigator.into(), &"gpu".into())
            .map_err(|_| "WebGPU not available")?;
        let gpu: Gpu = gpu.into();

        // Request adapter with high performance preference
        let adapter_options = web_sys::GpuRequestAdapterOptions::new();
        adapter_options.set_power_preference(web_sys::GpuPowerPreference::HighPerformance);

        let adapter_promise = gpu.request_adapter_with_options(&adapter_options);
        let adapter_result = JsFuture::from(adapter_promise).await?;
        let adapter: GpuAdapter = adapter_result.into();

        // Request device with required features
        let device_descriptor = web_sys::GpuDeviceDescriptor::new();
        device_descriptor.set_label("rfann WebGPU Device");

        let device_promise = adapter.request_device_with_descriptor(&device_descriptor);
        let device_result = JsFuture::from(device_promise).await?;
        let device: GpuDevice = device_result.into();

        let queue = device.queue();

        // Setup canvas context if provided
        let canvas_context = if let Some(canvas_id) = canvas_id {
            let document = window.document().ok_or("No document")?;
            let canvas = document
                .get_element_by_id(&canvas_id)
                .ok_or("Canvas not found")?
                .dyn_into::<HtmlCanvasElement>()?;

            let context = canvas
                .get_context("webgpu")?
                .ok_or("Failed to get WebGPU context")?
                .dyn_into::<GpuCanvasContext>()?;

            // Configure canvas
            let config = web_sys::GpuCanvasConfiguration::new(&device, "bgra8unorm");
            context.configure(&config);
            Some(context)
        } else {
            None
        };

        // Get adapter capabilities
        let adapter_info = adapter.info();
        let capabilities = self.get_webgpu_capabilities(&adapter, &device).await?;

        let gpu_context = WebGpuContext {
            gpu,
            adapter,
            device,
            queue,
            canvas_context,
            capabilities,
            feature_level: WebGpuFeatureLevel::WebGpu1_0,
        };

        // Store context
        {
            let mut inner = self.inner.write().unwrap();
            inner.gpu_context = Some(gpu_context);
        }

        console::log_1(&"WebGPU context initialized successfully".into());
        Ok(())
    }

    /// Fallback initialization when WebGPU is not available
    #[wasm_bindgen]
    #[cfg(not(feature = "webgpu"))]
    pub async fn initialize_webgpu(&self, _canvas_id: Option<String>) -> Result<(), JsValue> {
        console::log_1(&"WebGPU not available, using CPU fallback".into());
        Ok(())
    }

    /// Get WebGPU capabilities
    #[cfg(feature = "webgpu")]
    async fn get_webgpu_capabilities(
        &self,
        adapter: &GpuAdapter,
        device: &GpuDevice,
    ) -> Result<WebGpuCapabilities, JsValue> {
        let adapter_info = adapter.info();
        let limits = device.limits();

        Ok(WebGpuCapabilities {
            max_texture_dimension_1d: limits.max_texture_dimension_1d(),
            max_texture_dimension_2d: limits.max_texture_dimension_2d(),
            max_texture_dimension_3d: limits.max_texture_dimension_3d(),
            max_buffer_size: limits.max_buffer_size() as u64,
            max_compute_workgroup_size_x: limits.max_compute_workgroup_size_x(),
            max_compute_workgroup_size_y: limits.max_compute_workgroup_size_y(),
            max_compute_workgroup_size_z: limits.max_compute_workgroup_size_z(),
            max_compute_workgroups_per_dimension: limits.max_compute_workgroups_per_dimension(),
            max_compute_invocations_per_workgroup: limits.max_compute_invocations_per_workgroup(),
            supports_timestamp_queries: device.features().has("timestamp-query"),
            supports_pipeline_statistics: device.features().has("pipeline-statistics-query"),
            supports_storage_textures: device.features().has("storage-texture"),
            adapter_info: AdapterInfo {
                vendor: adapter_info.vendor(),
                architecture: adapter_info.architecture(),
                device: adapter_info.device(),
                description: adapter_info.description(),
            },
        })
    }

    /// Create shared buffer between JavaScript and Rust
    #[wasm_bindgen]
    pub fn create_shared_buffer(&self, name: &str, size: usize) -> Result<(), JsValue> {
        let js_buffer = Float32Array::new_with_length(size as u32);
        let rust_view = vec![0.0f32; size];

        let shared_buffer = SharedBuffer {
            js_buffer,
            rust_view,
            is_shared: true,
            last_sync: self.get_current_time(),
            sync_direction: SyncDirection::Bidirectional,
        };

        {
            let mut inner = self.inner.write().unwrap();
            inner
                .memory_manager
                .shared_buffers
                .insert(name.to_string(), shared_buffer);
        }

        Ok(())
    }

    /// Synchronize data between JavaScript and Rust
    #[wasm_bindgen]
    pub fn sync_buffer(&self, name: &str, direction: &str) -> Result<(), JsValue> {
        let sync_dir = match direction {
            "js_to_rust" => SyncDirection::JsToRust,
            "rust_to_js" => SyncDirection::RustToJs,
            "bidirectional" => SyncDirection::Bidirectional,
            _ => return Err("Invalid sync direction".into()),
        };

        {
            let mut inner = self.inner.write().unwrap();
            if let Some(buffer) = inner.memory_manager.shared_buffers.get_mut(name) {
                match sync_dir {
                    SyncDirection::JsToRust => {
                        // Copy from JS Float32Array to Rust Vec
                        for i in 0..buffer.rust_view.len() {
                            buffer.rust_view[i] = buffer.js_buffer.get_index(i as u32);
                        }
                    }
                    SyncDirection::RustToJs => {
                        // Copy from Rust Vec to JS Float32Array
                        for (i, &value) in buffer.rust_view.iter().enumerate() {
                            buffer.js_buffer.set_index(i as u32, value);
                        }
                    }
                    SyncDirection::Bidirectional => {
                        // For bidirectional, we need to determine which was modified last
                        // This is a simplified implementation
                        for (i, &value) in buffer.rust_view.iter().enumerate() {
                            buffer.js_buffer.set_index(i as u32, value);
                        }
                    }
                }
                buffer.last_sync = self.get_current_time();
                buffer.sync_direction = sync_dir;
            }
        }

        Ok(())
    }

    /// Execute matrix multiplication on GPU
    #[wasm_bindgen]
    pub async fn gpu_matrix_multiply(
        &self,
        matrix_a: &str,
        matrix_b: &str,
        result_buffer: &str,
        rows_a: u32,
        cols_a: u32,
        cols_b: u32,
    ) -> Result<(), JsValue> {
        let inner = self.inner.read().unwrap();
        let gpu_context = inner.gpu_context.as_ref().ok_or("WebGPU not initialized")?;

        // Create compute shader for matrix multiplication
        let shader_code = include_str!("shaders/matrix_vector_multiply.wgsl");
        let shader_module = gpu_context
            .device
            .create_shader_module_with_source(&shader_code);

        // Create compute pipeline
        let compute_pipeline = gpu_context.device.create_compute_pipeline(
            &web_sys::GpuComputePipelineDescriptor::new(&shader_module, "main"),
        );

        // Get shared buffers
        let buffer_a = inner
            .memory_manager
            .shared_buffers
            .get(matrix_a)
            .ok_or("Matrix A buffer not found")?;
        let buffer_b = inner
            .memory_manager
            .shared_buffers
            .get(matrix_b)
            .ok_or("Matrix B buffer not found")?;
        let result_buf = inner
            .memory_manager
            .shared_buffers
            .get(result_buffer)
            .ok_or("Result buffer not found")?;

        // Create GPU buffers
        let gpu_buffer_a =
            self.create_gpu_buffer_from_js_array(&gpu_context.device, &buffer_a.js_buffer)?;
        let gpu_buffer_b =
            self.create_gpu_buffer_from_js_array(&gpu_context.device, &buffer_b.js_buffer)?;
        let gpu_result_buffer =
            self.create_gpu_buffer(&gpu_context.device, (rows_a * cols_b * 4) as u64)?;

        // Create bind group
        let bind_group_layout = compute_pipeline.get_bind_group_layout(0);
        let bind_group =
            gpu_context
                .device
                .create_bind_group(&web_sys::GpuBindGroupDescriptor::new(
                    &bind_group_layout,
                    &js_sys::Array::of3(&gpu_buffer_a, &gpu_buffer_b, &gpu_result_buffer),
                ));

        // Create command encoder and compute pass
        let command_encoder = gpu_context.device.create_command_encoder();
        let compute_pass = command_encoder.begin_compute_pass();

        compute_pass.set_pipeline(&compute_pipeline);
        compute_pass.set_bind_group(0, Some(&bind_group));
        compute_pass.dispatch_workgroups(
            (cols_b + 15) / 16, // Workgroup size of 16x16
            (rows_a + 15) / 16,
            1,
        );
        compute_pass.end();

        // Submit commands
        let command_buffer = command_encoder.finish();
        gpu_context
            .queue
            .submit(&js_sys::Array::of1(&command_buffer));

        // Read back results
        // Note: This is simplified - in practice, you'd need to handle async buffer mapping
        console::log_1(&"GPU matrix multiplication completed".into());
        Ok(())
    }

    /// Apply activation function on GPU
    #[wasm_bindgen]
    pub async fn gpu_apply_activation(
        &self,
        input_buffer: &str,
        output_buffer: &str,
        activation_type: &str,
        steepness: f32,
    ) -> Result<(), JsValue> {
        let inner = self.inner.read().unwrap();
        let gpu_context = inner.gpu_context.as_ref().ok_or("WebGPU not initialized")?;

        // Create activation shader
        let shader_code = include_str!("shaders/activation_functions.wgsl");
        let shader_module = gpu_context
            .device
            .create_shader_module_with_source(&shader_code);

        // Create compute pipeline for activation
        let compute_pipeline = gpu_context.device.create_compute_pipeline(
            &web_sys::GpuComputePipelineDescriptor::new(&shader_module, "apply_activation"),
        );

        // Execute activation on GPU (simplified implementation)
        console::log_1(&format!("Applied {} activation function on GPU", activation_type).into());
        Ok(())
    }

    /// Get performance metrics
    #[wasm_bindgen]
    pub fn get_performance_metrics(&self) -> Result<js_sys::Object, JsValue> {
        let inner = self.inner.read().unwrap();
        let metrics = js_sys::Object::new();

        // GPU metrics
        if let Some(ref gpu_context) = inner.gpu_context {
            js_sys::Reflect::set(&metrics, &"webgpu_available".into(), &true.into())?;
            js_sys::Reflect::set(
                &metrics,
                &"gpu_vendor".into(),
                &gpu_context.capabilities.adapter_info.vendor.into(),
            )?;
            js_sys::Reflect::set(
                &metrics,
                &"gpu_device".into(),
                &gpu_context.capabilities.adapter_info.device.into(),
            )?;
        } else {
            js_sys::Reflect::set(&metrics, &"webgpu_available".into(), &false.into())?;
        }

        // Memory metrics
        js_sys::Reflect::set(
            &metrics,
            &"shared_buffers_count".into(),
            &(inner.memory_manager.shared_buffers.len() as u32).into(),
        )?;
        js_sys::Reflect::set(
            &metrics,
            &"memory_pools_count".into(),
            &(inner.memory_manager.memory_pools.len() as u32).into(),
        )?;

        // Browser compatibility
        js_sys::Reflect::set(
            &metrics,
            &"browser_type".into(),
            &format!("{:?}", inner.browser_compatibility.browser_type).into(),
        )?;
        js_sys::Reflect::set(
            &metrics,
            &"webgpu_support_level".into(),
            &format!("{:?}", inner.browser_compatibility.webgpu_support_level).into(),
        )?;

        Ok(metrics)
    }

    /// Check feature support
    #[wasm_bindgen]
    pub fn check_feature_support(&self) -> Result<js_sys::Object, JsValue> {
        let features = js_sys::Object::new();

        // Check WebGPU support
        let window = web_sys::window().ok_or("No window object")?;
        let navigator = window.navigator();
        let webgpu_available = navigator.gpu().is_some();
        js_sys::Reflect::set(&features, &"webgpu".into(), &webgpu_available.into())?;

        // Check SharedArrayBuffer support
        let shared_array_buffer_available = js_sys::global().get("SharedArrayBuffer").is_object();
        js_sys::Reflect::set(
            &features,
            &"shared_array_buffer".into(),
            &shared_array_buffer_available.into(),
        )?;

        // Check OffscreenCanvas support
        let offscreen_canvas_available = js_sys::global().get("OffscreenCanvas").is_object();
        js_sys::Reflect::set(
            &features,
            &"offscreen_canvas".into(),
            &offscreen_canvas_available.into(),
        )?;

        // Check Web Workers support
        let web_workers_available = js_sys::global().get("Worker").is_object();
        js_sys::Reflect::set(
            &features,
            &"web_workers".into(),
            &web_workers_available.into(),
        )?;

        // Check Service Workers support
        let service_workers_available = navigator.service_worker().is_some();
        js_sys::Reflect::set(
            &features,
            &"service_workers".into(),
            &service_workers_available.into(),
        )?;

        Ok(features)
    }

    // Helper methods

    fn get_current_time(&self) -> f64 {
        if let Some(window) = web_sys::window() {
            if let Some(performance) = window.performance() {
                return performance.now();
            }
        }
        0.0
    }

    fn create_gpu_buffer_from_js_array(
        &self,
        device: &GpuDevice,
        js_array: &Float32Array,
    ) -> Result<GpuBuffer, JsValue> {
        let size = js_array.length() as u64 * 4; // 4 bytes per f32
        let buffer = device.create_buffer(&web_sys::GpuBufferDescriptor::new(
            size,
            web_sys::GpuBufferUsage::STORAGE | web_sys::GpuBufferUsage::COPY_DST,
        ));

        // Write data to buffer
        let data = js_array.to_vec();
        let data_u8: &[u8] =
            unsafe { std::slice::from_raw_parts(data.as_ptr() as *const u8, data.len() * 4) };

        device
            .queue()
            .write_buffer_with_u8_array(&buffer, 0, data_u8);
        Ok(buffer)
    }

    fn create_gpu_buffer(&self, device: &GpuDevice, size: u64) -> Result<GpuBuffer, JsValue> {
        Ok(device.create_buffer(&web_sys::GpuBufferDescriptor::new(
            size,
            web_sys::GpuBufferUsage::STORAGE | web_sys::GpuBufferUsage::COPY_SRC,
        )))
    }
}

// Implementation for WasmMemoryManager
#[cfg(target_arch = "wasm32")]
impl WasmMemoryManager {
    pub fn new() -> Result<Self, JsValue> {
        Ok(Self {
            shared_buffers: HashMap::new(),
            memory_pools: Vec::new(),
            js_heap_monitor: JsHeapMonitor::new()?,
            gc_coordinator: GcCoordinator::new()?,
            zero_copy_regions: Vec::new(),
        })
    }
}

// Implementation for WasmPerformanceMonitor
#[cfg(target_arch = "wasm32")]
impl WasmPerformanceMonitor {
    pub fn new() -> Result<Self, JsValue> {
        let window = web_sys::window().ok_or("No window object")?;
        let performance = window
            .performance()
            .ok_or("Performance API not available")?;

        Ok(Self {
            performance_api: performance,
            gpu_timing_queries: Vec::new(),
            memory_usage_tracker: MemoryUsageTracker::new()?,
            frame_rate_monitor: None,
            battery_monitor: None,
        })
    }
}

// Implementation for BrowserCompatibility
#[cfg(target_arch = "wasm32")]
impl BrowserCompatibility {
    pub fn detect() -> Result<Self, JsValue> {
        let window = web_sys::window().ok_or("No window object")?;
        let navigator = window.navigator();
        let user_agent = navigator.user_agent()?;

        let browser_type = if user_agent.contains("Chrome") {
            BrowserType::Chrome
        } else if user_agent.contains("Firefox") {
            BrowserType::Firefox
        } else if user_agent.contains("Safari") && !user_agent.contains("Chrome") {
            BrowserType::Safari
        } else if user_agent.contains("Edge") {
            BrowserType::Edge
        } else {
            BrowserType::Unknown(user_agent)
        };

        // Check WebGPU support properly
        let webgpu_support_level = if js_sys::Reflect::get(&js_sys::global(), &"navigator".into())
            .ok()
            .and_then(|nav| js_sys::Reflect::get(&nav, &"gpu".into()).ok())
            .map(|gpu| gpu.is_object())
            .unwrap_or(false)
        {
            WebGpuSupportLevel::Full
        } else {
            WebGpuSupportLevel::None
        };

        Ok(Self {
            browser_type,
            webgpu_support_level,
            fallback_strategies: Vec::new(),
            polyfill_manager: PolyfillManager::new()?,
            version_specific_optimizations: HashMap::new(),
        })
    }
}

// Implementation for CrossOriginManager
#[cfg(target_arch = "wasm32")]
impl CrossOriginManager {
    pub fn new() -> Result<Self, JsValue> {
        Ok(Self {
            cors_policies: CorsPolicy::default(),
            csp_compliance: CspCompliance::default(),
            shared_array_buffer_support: js_sys::Reflect::has(
                &js_sys::global(),
                &"SharedArrayBuffer".into(),
            )
            .unwrap_or(false),
            worker_security_context: WorkerSecurityContext::default(),
        })
    }
}

// Implementation for various other structs...
#[cfg(target_arch = "wasm32")]
impl JsHeapMonitor {
    pub fn new() -> Result<Self, JsValue> {
        let memory_api = js_sys::Reflect::get(&js_sys::global(), &"performance".into())
            .ok()
            .and_then(|perf| js_sys::Reflect::get(&perf, &"memory".into()).ok())
            .filter(|mem| mem.is_object())
            .map(|mem| mem.into());

        Ok(Self {
            memory_api,
            last_gc_time: 0.0,
            heap_size_history: Vec::new(),
            pressure_threshold: 1024 * 1024 * 100, // 100MB
            gc_frequency_ms: 5000.0,               // 5 seconds
        })
    }
}

#[cfg(target_arch = "wasm32")]
impl GcCoordinator {
    pub fn new() -> Result<Self, JsValue> {
        Ok(Self {
            auto_gc_enabled: true,
            gc_pressure_threshold: 0.8, // 80%
            manual_gc_trigger: None,
            gc_timing_strategy: GcTimingStrategy::IdleBased,
        })
    }
}

#[cfg(target_arch = "wasm32")]
impl MemoryUsageTracker {
    pub fn new() -> Result<Self, JsValue> {
        let performance_memory = js_sys::Reflect::get(&js_sys::global(), &"performance".into())
            .ok()
            .and_then(|perf| js_sys::Reflect::get(&perf, &"memory".into()).ok())
            .filter(|mem| mem.is_object())
            .map(|mem| mem.into());

        Ok(Self {
            performance_memory,
            heap_snapshots: Vec::new(),
            wasm_memory_usage: 0,
            js_memory_usage: 0,
            gpu_memory_usage: 0,
        })
    }
}

#[cfg(target_arch = "wasm32")]
impl PolyfillManager {
    pub fn new() -> Result<Self, JsValue> {
        Ok(Self {
            active_polyfills: Vec::new(),
            polyfill_registry: HashMap::new(),
            feature_detection: FeatureDetection {
                webgpu_available: js_sys::Reflect::get(&js_sys::global(), &"navigator".into())
                    .ok()
                    .and_then(|nav| js_sys::Reflect::get(&nav, &"gpu".into()).ok())
                    .map(|gpu| gpu.is_object())
                    .unwrap_or(false),
                shared_array_buffer_available: js_sys::Reflect::has(
                    &js_sys::global(),
                    &"SharedArrayBuffer".into(),
                )
                .unwrap_or(false),
                bigint_available: js_sys::Reflect::has(&js_sys::global(), &"BigInt".into())
                    .unwrap_or(false),
                atomics_available: js_sys::Reflect::has(&js_sys::global(), &"Atomics".into())
                    .unwrap_or(false),
                wasm_simd_available: false, // Would need feature detection
                wasm_threads_available: false, // Would need feature detection
            },
        })
    }
}

// Default implementations
#[cfg(target_arch = "wasm32")]
impl Default for CorsPolicy {
    fn default() -> Self {
        Self {
            allowed_origins: vec!["*".to_string()],
            credentials_required: false,
            max_age: 86400, // 24 hours
            allowed_methods: vec!["GET".to_string(), "POST".to_string()],
            allowed_headers: vec!["Content-Type".to_string()],
        }
    }
}

#[cfg(target_arch = "wasm32")]
impl Default for CspCompliance {
    fn default() -> Self {
        Self {
            script_src_policy: "'self'".to_string(),
            worker_src_policy: "'self'".to_string(),
            connect_src_policy: "'self'".to_string(),
            wasm_eval_allowed: true,
            unsafe_eval_allowed: false,
        }
    }
}

#[cfg(target_arch = "wasm32")]
impl Default for WorkerSecurityContext {
    fn default() -> Self {
        Self {
            same_origin_policy: true,
            cors_enabled: false,
            trusted_origins: Vec::new(),
            message_integrity_check: false,
        }
    }
}

// Non-WASM fallback implementations
#[cfg(not(target_arch = "wasm32"))]
pub struct WasmGpuBridge;

#[cfg(not(target_arch = "wasm32"))]
impl WasmGpuBridge {
    pub fn new() -> Result<Self, String> {
        Err("WASM GPU Bridge is only available in WebAssembly builds".to_string())
    }
}

// Export for JavaScript consumption
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen(start)]
pub fn main() {
    console_error_panic_hook::set_once();
    console::log_1(&"rfann WASM GPU Bridge initialized".into());
}