optirs-tpu 0.3.1

// TPU runtime integration for XLA executables
//
// This module handles integration with the TPU runtime system,
// including executable creation, device management, execution scheduling,
// and resource management.

use std::collections::{HashMap, VecDeque};
use std::sync::{Arc, Mutex, RwLock};
use std::time::{Duration, Instant};

use super::super::{GeneratedCode, TPUConfig, TPUVersion};
use crate::error::{OptimError, Result};
use crate::main_types::PodTopology;

/// Runtime integration manager
pub struct RuntimeIntegration {
    /// Target TPU configuration
    target_config: TPUConfig,

    /// Runtime configuration
    runtime_config: RuntimeConfig,

    /// Device manager
    device_manager: DeviceManager,

    /// Executable manager
    executable_manager: ExecutableManager,

    /// Execution scheduler
    execution_scheduler: ExecutionScheduler,

    /// Resource manager
    resource_manager: ResourceManager,

    /// Memory manager
    memory_manager: RuntimeMemoryManager,

    /// Integration statistics
    integration_stats: RuntimeIntegrationStats,
}

/// Runtime configuration
#[derive(Debug, Clone)]
pub struct RuntimeConfig {
    /// Enable asynchronous execution
    pub async_execution: bool,

    /// Enable profiling hooks
    pub enable_profiling: bool,

    /// Maximum concurrent executions
    pub max_concurrent_executions: usize,

    /// Memory pool size
    pub memory_pool_size: usize,

    /// Timeout for operations (milliseconds)
    pub operation_timeout_ms: u64,

    /// Enable error checking
    pub enable_error_checking: bool,

    /// Runtime optimization level
    pub optimization_level: RuntimeOptimizationLevel,
}

/// Runtime optimization levels
#[derive(Debug, Clone)]
pub enum RuntimeOptimizationLevel {
    /// No optimizations
    None,

    /// Basic optimizations
    Basic,

    /// Aggressive optimizations
    Aggressive,

    /// Maximum optimizations
    Maximum,
}

/// Runtime integration statistics
#[derive(Debug, Default)]
pub struct RuntimeIntegrationStats {
    /// Total executables created
    pub executables_created: usize,

    /// Total executions
    pub total_executions: usize,

    /// Average execution time (microseconds)
    pub avg_execution_time_us: u64,

    /// Peak memory usage (bytes)
    pub peak_memory_usage: usize,

    /// Device utilization
    pub device_utilization: f64,

    /// Runtime overhead (microseconds)
    pub runtime_overhead_us: u64,

    /// Error count
    pub error_count: usize,
}

/// Device manager for TPU devices
pub struct DeviceManager {
    /// Available devices
    available_devices: Vec<TPUDevice>,

    /// Device assignments
    device_assignments: HashMap<String, usize>,

    /// Device status
    device_status: HashMap<usize, DeviceStatus>,

    /// Device capabilities cache
    capabilities_cache: HashMap<usize, DeviceCapabilities>,
}

/// TPU device representation
#[derive(Debug, Clone)]
pub struct TPUDevice {
    /// Device ID
    pub id: usize,

    /// Device type
    pub device_type: TPUDeviceType,

    /// Device version
    pub version: TPUVersion,

    /// Memory capacity (bytes)
    pub memory_capacity: usize,

    /// Compute throughput (TOPS)
    pub compute_throughput: f64,

    /// Device state
    pub state: DeviceState,

    /// Last health check
    pub last_health_check: Instant,
}

/// TPU device types
#[derive(Debug, Clone)]
pub enum TPUDeviceType {
    /// Single chip TPU
    SingleChip,

    /// Multi-chip TPU pod
    Pod,

    /// TPU slice
    Slice,

    /// Virtual TPU (for testing)
    Virtual,
}

/// Device states
#[derive(Debug, Clone)]
pub enum DeviceState {
    /// Device available for use
    Available,

    /// Device currently in use
    InUse,

    /// Device initializing
    Initializing,

    /// Device error state
    Error(String),

    /// Device maintenance mode
    Maintenance,
}

/// Device status information
#[derive(Debug, Default)]
pub struct DeviceStatus {
    /// Current utilization (0.0-1.0)
    pub utilization: f64,

    /// Memory usage (bytes)
    pub memory_usage: usize,

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

    /// Power consumption (watts)
    pub power_consumption: f32,

    /// Error flags
    pub error_flags: Vec<String>,

    /// Performance counters
    pub performance_counters: HashMap<String, u64>,
}

/// Device capabilities
#[derive(Debug, Clone)]
pub struct DeviceCapabilities {
    /// Supported data types
    pub supported_dtypes: Vec<String>,

    /// Maximum matrix dimensions
    pub max_matrix_dims: (usize, usize),

    /// Vector processing width
    pub vector_width: usize,

    /// Memory bandwidth (GB/s)
    pub memory_bandwidth: f64,

    /// Special instructions
    pub special_instructions: Vec<String>,

    /// Interconnect capabilities
    pub interconnect_capabilities: InterconnectCapabilities,
}

/// Interconnect capabilities
#[derive(Debug, Clone)]
pub struct InterconnectCapabilities {
    /// Inter-chip bandwidth (GB/s)
    pub inter_chip_bandwidth: f64,

    /// Inter-pod bandwidth (GB/s)
    pub inter_pod_bandwidth: f64,

    /// Supported collective operations
    pub collective_ops: Vec<String>,

    /// Topology type
    pub topology_type: TopologyType,
}

/// Network topology types
#[derive(Debug, Clone)]
pub enum TopologyType {
    /// Mesh topology
    Mesh,

    /// Torus topology
    Torus,

    /// Tree topology
    Tree,

    /// Custom topology
    Custom(String),
}

/// Executable manager
pub struct ExecutableManager {
    /// Loaded executables
    executables: HashMap<String, TPUExecutable>,

    /// Executable cache
    executable_cache: ExecutableCache,

    /// Loading queue
    loading_queue: VecDeque<LoadingRequest>,

    /// Execution contexts
    execution_contexts: HashMap<String, ExecutionContext>,
}

/// TPU executable representation
#[derive(Debug)]
pub struct TPUExecutable {
    /// Executable ID
    pub id: String,

    /// Binary code
    pub binary: Vec<u8>,

    /// Executable metadata
    pub metadata: ExecutableMetadata,

    /// Input specifications
    pub input_specs: Vec<BufferSpec>,

    /// Output specifications
    pub output_specs: Vec<BufferSpec>,

    /// Resource requirements
    pub resource_requirements: ExecutableResourceRequirements,

    /// Performance profile
    pub performance_profile: ExecutionProfile,
}

/// Executable metadata
#[derive(Debug, Clone)]
pub struct ExecutableMetadata {
    /// Compilation timestamp
    pub compilation_time: Instant,

    /// Compiler version
    pub compiler_version: String,

    /// Target device requirements
    pub target_requirements: TargetRequirements,

    /// Optimization level used
    pub optimization_level: String,

    /// Debug information
    pub debug_info: Option<DebugInfo>,
}

/// Buffer specification
#[derive(Debug, Clone)]
pub struct BufferSpec {
    /// Buffer name
    pub name: String,

    /// Buffer size (bytes)
    pub size: usize,

    /// Data type
    pub dtype: String,

    /// Shape information
    pub shape: Vec<usize>,

    /// Memory alignment requirements
    pub alignment: usize,

    /// Access pattern
    pub access_pattern: BufferAccessPattern,
}

/// Buffer access patterns
#[derive(Debug, Clone)]
pub enum BufferAccessPattern {
    /// Sequential access
    Sequential,

    /// Random access
    Random,

    /// Strided access
    Strided(usize),

    /// Read-only access
    ReadOnly,

    /// Write-only access
    WriteOnly,
}

/// Executable resource requirements
#[derive(Debug, Default)]
pub struct ExecutableResourceRequirements {
    /// Memory requirement (bytes)
    pub memory_bytes: usize,

    /// Compute requirement (FLOPS)
    pub compute_flops: u64,

    /// Communication volume (bytes)
    pub communication_bytes: usize,

    /// Execution time estimate (microseconds)
    pub execution_time_estimate_us: u64,

    /// Device count requirement
    pub device_count: usize,
}

/// Execution profile for performance tracking
#[derive(Debug, Default)]
pub struct ExecutionProfile {
    /// Average execution time
    pub avg_execution_time_us: u64,

    /// Peak memory usage
    pub peak_memory_usage: usize,

    /// Throughput (operations per second)
    pub throughput: f64,

    /// Resource utilization
    pub resource_utilization: f64,

    /// Execution history
    pub execution_history: Vec<ExecutionRecord>,
}

/// Execution record
#[derive(Debug)]
pub struct ExecutionRecord {
    /// Execution timestamp
    pub timestamp: Instant,

    /// Execution duration
    pub duration: Duration,

    /// Input sizes
    pub input_sizes: Vec<usize>,

    /// Output sizes
    pub output_sizes: Vec<usize>,

    /// Device utilization during execution
    pub device_utilization: f64,

    /// Memory usage during execution
    pub memory_usage: usize,
}

/// Target requirements for executable
#[derive(Debug, Clone)]
pub struct TargetRequirements {
    /// Minimum TPU version
    pub min_tpu_version: TPUVersion,

    /// Required memory (bytes)
    pub required_memory: usize,

    /// Required features
    pub required_features: Vec<String>,

    /// Optional features
    pub optional_features: Vec<String>,
}

/// Debug information for executable
#[derive(Debug, Clone)]
pub struct DebugInfo {
    /// Source mapping
    pub source_mapping: HashMap<usize, String>,

    /// Symbol table
    pub symbol_table: HashMap<String, usize>,

    /// Line number information
    pub line_info: Vec<LineInfo>,
}

/// Line information for debugging
#[derive(Debug, Clone)]
pub struct LineInfo {
    /// Instruction address
    pub address: usize,

    /// Source file
    pub file: String,

    /// Line number
    pub line: u32,

    /// Function name
    pub function: String,
}

/// Executable cache for performance
pub struct ExecutableCache {
    /// Cache entries
    cache: HashMap<String, CachedExecutable>,

    /// Cache configuration
    config: CacheConfig,

    /// Cache statistics
    stats: CacheStats,
}

/// Cached executable entry
#[derive(Debug)]
pub struct CachedExecutable {
    /// Executable
    pub executable: TPUExecutable,

    /// Last access time
    pub last_access: Instant,

    /// Access count
    pub access_count: u64,

    /// Cache score
    pub score: f64,
}

/// Cache configuration
#[derive(Debug)]
pub struct CacheConfig {
    /// Maximum cache size (bytes)
    pub max_size: usize,

    /// Maximum number of entries
    pub max_entries: usize,

    /// Eviction policy
    pub eviction_policy: EvictionPolicy,
}

/// Cache eviction policies
#[derive(Debug)]
pub enum EvictionPolicy {
    /// Least Recently Used
    LRU,

    /// Least Frequently Used
    LFU,

    /// Optimal (theoretical)
    Optimal,
}

/// Cache statistics
#[derive(Debug, Default)]
pub struct CacheStats {
    /// Cache hits
    pub hits: u64,

    /// Cache misses
    pub misses: u64,

    /// Evictions
    pub evictions: u64,

    /// Cache utilization
    pub utilization: f64,
}

/// Loading request for executables
#[derive(Debug)]
pub struct LoadingRequest {
    /// Request ID
    pub id: String,

    /// Generated code to load
    pub code: GeneratedCode,

    /// Target device
    pub target_device: usize,

    /// Priority
    pub priority: u32,

    /// Request timestamp
    pub timestamp: Instant,
}

/// Execution context for running executables
#[derive(Debug)]
pub struct ExecutionContext {
    /// Context ID
    pub id: String,

    /// Associated device
    pub device_id: usize,

    /// Input buffers
    pub input_buffers: HashMap<String, Buffer>,

    /// Output buffers
    pub output_buffers: HashMap<String, Buffer>,

    /// Temporary buffers
    pub temp_buffers: HashMap<String, Buffer>,

    /// Context state
    pub state: ContextState,

    /// Performance counters
    pub performance_counters: HashMap<String, u64>,
}

/// Runtime buffer representation
#[derive(Debug)]
pub struct Buffer {
    /// Buffer ID
    pub id: String,

    /// Size in bytes
    pub size: usize,

    /// Memory location
    pub memory_location: MemoryLocation,

    /// Buffer status
    pub status: BufferStatus,

    /// Access tracking
    pub access_tracking: AccessTracking,
}

/// Memory locations for buffers
#[derive(Debug)]
pub enum MemoryLocation {
    /// Device memory
    Device(usize),

    /// Host memory
    Host,

    /// Shared memory
    Shared,

    /// External memory
    External(String),
}

/// Buffer status
#[derive(Debug)]
pub enum BufferStatus {
    /// Buffer allocated
    Allocated,

    /// Buffer ready for use
    Ready,

    /// Buffer in use
    InUse,

    /// Buffer being transferred
    Transferring,

    /// Buffer error state
    Error(String),
}

/// Access tracking for buffers
#[derive(Debug, Default)]
pub struct AccessTracking {
    /// Read count
    pub read_count: u64,

    /// Write count
    pub write_count: u64,

    /// Last access time
    pub last_access: Option<Instant>,

    /// Access pattern
    pub pattern: Option<BufferAccessPattern>,
}

/// Context states
#[derive(Debug)]
pub enum ContextState {
    /// Context ready
    Ready,

    /// Context executing
    Executing,

    /// Context waiting for resources
    Waiting,

    /// Context error state
    Error(String),
}

/// Execution scheduler for managing concurrent executions
pub struct ExecutionScheduler {
    /// Execution queue
    execution_queue: VecDeque<ExecutionRequest>,

    /// Active executions
    active_executions: HashMap<String, ActiveExecution>,

    /// Scheduler configuration
    scheduler_config: SchedulerConfig,

    /// Scheduling policy
    scheduling_policy: SchedulingPolicy,
}

/// Execution request
#[derive(Debug)]
pub struct ExecutionRequest {
    /// Request ID
    pub id: String,

    /// Executable to run
    pub executable_id: String,

    /// Input data
    pub inputs: HashMap<String, Vec<u8>>,

    /// Request priority
    pub priority: u32,

    /// Request timestamp
    pub timestamp: Instant,

    /// Timeout
    pub timeout: Option<Duration>,
}

/// Active execution tracking
#[derive(Debug)]
pub struct ActiveExecution {
    /// Execution ID
    pub id: String,

    /// Associated context
    pub context_id: String,

    /// Start time
    pub start_time: Instant,

    /// Expected completion time
    pub expected_completion: Option<Instant>,

    /// Progress tracking
    pub progress: ExecutionProgress,
}

/// Execution progress tracking
#[derive(Debug, Default)]
pub struct ExecutionProgress {
    /// Completion percentage (0.0-1.0)
    pub completion_percentage: f64,

    /// Current stage
    pub current_stage: String,

    /// Stages completed
    pub stages_completed: usize,

    /// Total stages
    pub total_stages: usize,
}

/// Scheduler configuration
#[derive(Debug)]
pub struct SchedulerConfig {
    /// Maximum concurrent executions
    pub max_concurrent: usize,

    /// Scheduling quantum (milliseconds)
    pub quantum_ms: u64,

    /// Enable preemption
    pub enable_preemption: bool,

    /// Priority levels
    pub priority_levels: usize,
}

/// Scheduling policies
#[derive(Debug)]
pub enum SchedulingPolicy {
    /// First-come first-served
    FCFS,

    /// Priority-based scheduling
    Priority,

    /// Round-robin scheduling
    RoundRobin,

    /// Fair sharing
    FairShare,

    /// Shortest job first
    SJF,
}

/// Resource manager for runtime resources
pub struct ResourceManager {
    /// Resource pools
    resource_pools: HashMap<String, ResourcePool>,

    /// Resource allocations
    allocations: HashMap<String, ResourceAllocation>,

    /// Resource usage tracking
    usage_tracking: ResourceUsageTracking,
}

/// Resource pool
#[derive(Debug)]
pub struct ResourcePool {
    /// Pool name
    pub name: String,

    /// Resource type
    pub resource_type: ResourceType,

    /// Available resources
    pub available: usize,

    /// Total resources
    pub total: usize,

    /// Reserved resources
    pub reserved: usize,
}

/// Types of resources
#[derive(Debug)]
pub enum ResourceType {
    /// Compute resources
    Compute,

    /// Memory resources
    Memory,

    /// Communication resources
    Communication,

    /// Storage resources
    Storage,
}

/// Resource allocation
#[derive(Debug)]
pub struct ResourceAllocation {
    /// Allocation ID
    pub id: String,

    /// Allocated resources by type
    pub resources: HashMap<ResourceType, usize>,

    /// Allocation timestamp
    pub timestamp: Instant,

    /// Allocation duration
    pub duration: Option<Duration>,
}

/// Resource usage tracking
#[derive(Debug, Default)]
pub struct ResourceUsageTracking {
    /// Peak usage by resource type
    pub peak_usage: HashMap<ResourceType, usize>,

    /// Average usage by resource type
    pub avg_usage: HashMap<ResourceType, f64>,

    /// Usage timeline
    pub timeline: Vec<UsageSnapshot>,
}

/// Usage snapshot
#[derive(Debug)]
pub struct UsageSnapshot {
    /// Snapshot timestamp
    pub timestamp: Instant,

    /// Usage by resource type
    pub usage: HashMap<ResourceType, usize>,

    /// Utilization percentage
    pub utilization: f64,
}

/// Runtime memory manager
pub struct RuntimeMemoryManager {
    /// Memory pools
    memory_pools: HashMap<String, MemoryPool>,

    /// Buffer allocations
    buffer_allocations: HashMap<String, BufferAllocation>,

    /// Memory usage statistics
    usage_stats: MemoryUsageStats,
}

/// Memory pool for runtime
#[derive(Debug)]
pub struct MemoryPool {
    /// Pool name
    pub name: String,

    /// Pool size (bytes)
    pub size: usize,

    /// Available memory (bytes)
    pub available: usize,

    /// Memory location
    pub location: MemoryLocation,

    /// Pool fragmentation
    pub fragmentation: f64,
}

/// Buffer allocation in runtime
#[derive(Debug)]
pub struct BufferAllocation {
    /// Buffer ID
    pub buffer_id: String,

    /// Allocated size
    pub size: usize,

    /// Memory pool
    pub pool: String,

    /// Allocation timestamp
    pub timestamp: Instant,

    /// Reference count
    pub ref_count: usize,
}

/// Memory usage statistics
#[derive(Debug, Default)]
pub struct MemoryUsageStats {
    /// Total allocated (bytes)
    pub total_allocated: usize,

    /// Peak usage (bytes)
    pub peak_usage: usize,

    /// Fragmentation ratio
    pub fragmentation_ratio: f64,

    /// Allocation count
    pub allocation_count: usize,

    /// Deallocation count
    pub deallocation_count: usize,
}

impl RuntimeIntegration {
    /// Create new runtime integration manager
    pub fn new(target_config: TPUConfig) -> Self {
        let runtime_config = RuntimeConfig {
            async_execution: true,
            enable_profiling: false,
            max_concurrent_executions: 4,
            memory_pool_size: 1024 * 1024 * 1024, // 1GB
            operation_timeout_ms: 30000,          // 30 seconds
            enable_error_checking: true,
            optimization_level: RuntimeOptimizationLevel::Basic,
        };

        Self {
            device_manager: DeviceManager::new(&target_config),
            executable_manager: ExecutableManager::new(),
            execution_scheduler: ExecutionScheduler::new(&runtime_config),
            resource_manager: ResourceManager::new(),
            memory_manager: RuntimeMemoryManager::new(&runtime_config),
            target_config,
            runtime_config,
            integration_stats: RuntimeIntegrationStats::default(),
        }
    }

    /// Integrate generated code with runtime
    pub fn integrate(&mut self, code: GeneratedCode, _target_tpu: &TPUConfig) -> Result<Vec<u8>> {
        let start_time = Instant::now();

        // Create executable from generated code
        let executable = self.create_executable(code)?;

        // Load executable into runtime
        let executable_id = self.executable_manager.load_executable(executable)?;

        // Create binary representation
        let binary = self.create_binary(&executable_id)?;

        self.integration_stats.runtime_overhead_us = start_time.elapsed().as_micros() as u64;
        self.integration_stats.executables_created += 1;

        Ok(binary)
    }

    /// Create executable from generated code
    fn create_executable(&self, code: GeneratedCode) -> Result<TPUExecutable> {
        let executable = TPUExecutable {
            id: format!("exec_{}", self.integration_stats.executables_created),
            binary: code.kernel_code.as_bytes().to_vec(),
            metadata: ExecutableMetadata {
                compilation_time: Instant::now(),
                compiler_version: "1.0.0".to_string(),
                target_requirements: TargetRequirements {
                    min_tpu_version: self.target_config.tpu_version,
                    required_memory: 1024 * 1024, // 1MB
                    required_features: vec!["matmul".to_string()],
                    optional_features: vec![],
                },
                optimization_level: "O2".to_string(),
                debug_info: None,
            },
            input_specs: vec![],
            output_specs: vec![],
            resource_requirements: ExecutableResourceRequirements::default(),
            performance_profile: ExecutionProfile::default(),
        };

        Ok(executable)
    }

    /// Create binary representation
    fn create_binary(&self, _executable_id: &str) -> Result<Vec<u8>> {
        // Binary creation logic
        Ok(vec![0xDE, 0xAD, 0xBE, 0xEF]) // Placeholder binary
    }
}

impl DeviceManager {
    /// Create new device manager
    pub fn new(target_config: &TPUConfig) -> Self {
        let mut devices = Vec::new();

        // Create virtual devices based on target config
        // Determine number of chips based on pod topology
        let num_chips = match target_config.pod_topology {
            PodTopology::Single => 1,
            PodTopology::Pod2x2 => 4,
            PodTopology::Pod4x4 => 16,
            PodTopology::Pod8x8 => 64,
            PodTopology::Pod16x16 => 256,
            PodTopology::Pod32x32 => 1024,
        };

        for i in 0..num_chips {
            devices.push(TPUDevice {
                id: i,
                device_type: TPUDeviceType::SingleChip,
                version: target_config.tpu_version,
                memory_capacity: 16 * 1024 * 1024 * 1024 / num_chips, // Default 16GB per chip
                compute_throughput: 420.0 / num_chips as f64,         // Default 420 TFLOPS total
                state: DeviceState::Available,
                last_health_check: Instant::now(),
            });
        }

        Self {
            available_devices: devices,
            device_assignments: HashMap::new(),
            device_status: HashMap::new(),
            capabilities_cache: HashMap::new(),
        }
    }
}

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

impl ExecutableManager {
    /// Create new executable manager
    pub fn new() -> Self {
        Self {
            executables: HashMap::new(),
            executable_cache: ExecutableCache::new(),
            loading_queue: VecDeque::new(),
            execution_contexts: HashMap::new(),
        }
    }

    /// Load executable into runtime
    pub fn load_executable(&mut self, executable: TPUExecutable) -> Result<String> {
        let id = executable.id.clone();
        self.executables.insert(id.clone(), executable);
        Ok(id)
    }
}

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

impl ExecutableCache {
    /// Create new executable cache
    pub fn new() -> Self {
        Self {
            cache: HashMap::new(),
            config: CacheConfig {
                max_size: 100 * 1024 * 1024, // 100MB
                max_entries: 100,
                eviction_policy: EvictionPolicy::LRU,
            },
            stats: CacheStats::default(),
        }
    }
}

impl ExecutionScheduler {
    /// Create new execution scheduler
    pub fn new(runtime_config: &RuntimeConfig) -> Self {
        Self {
            execution_queue: VecDeque::new(),
            active_executions: HashMap::new(),
            scheduler_config: SchedulerConfig {
                max_concurrent: runtime_config.max_concurrent_executions,
                quantum_ms: 100,
                enable_preemption: false,
                priority_levels: 4,
            },
            scheduling_policy: SchedulingPolicy::Priority,
        }
    }
}

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

impl ResourceManager {
    /// Create new resource manager
    pub fn new() -> Self {
        let mut resource_pools = HashMap::new();

        // Create default resource pools
        resource_pools.insert(
            "compute".to_string(),
            ResourcePool {
                name: "compute".to_string(),
                resource_type: ResourceType::Compute,
                available: 100,
                total: 100,
                reserved: 0,
            },
        );

        resource_pools.insert(
            "memory".to_string(),
            ResourcePool {
                name: "memory".to_string(),
                resource_type: ResourceType::Memory,
                available: 32 * 1024 * 1024 * 1024, // 32GB
                total: 32 * 1024 * 1024 * 1024,
                reserved: 0,
            },
        );

        Self {
            resource_pools,
            allocations: HashMap::new(),
            usage_tracking: ResourceUsageTracking::default(),
        }
    }
}

impl RuntimeMemoryManager {
    /// Create new runtime memory manager
    pub fn new(runtime_config: &RuntimeConfig) -> Self {
        let mut memory_pools = HashMap::new();

        // Create device memory pool
        memory_pools.insert(
            "device".to_string(),
            MemoryPool {
                name: "device".to_string(),
                size: runtime_config.memory_pool_size,
                available: runtime_config.memory_pool_size,
                location: MemoryLocation::Device(0),
                fragmentation: 0.0,
            },
        );

        Self {
            memory_pools,
            buffer_allocations: HashMap::new(),
            usage_stats: MemoryUsageStats::default(),
        }
    }
}

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

    #[test]
    fn test_runtime_integration_creation() {
        use crate::main_types::{PodTopology, TPUConfig, TPUVersion};

        let tpu_config = TPUConfig {
            tpu_version: TPUVersion::V4,
            num_cores: 8,
            enable_xla: true,
            xla_optimization_level: crate::main_types::XLAOptimizationLevel::Standard,
            mixed_precision: true,
            batch_size_per_core: 32,
            enable_pod_coordination: false,
            pod_topology: PodTopology::Pod2x2,
            memory_optimization: crate::main_types::TPUMemoryOptimization::Balanced,
            gradient_compression: true,
            prefetch_depth: 2,
            experimental_features: false,
        };

        let runtime = RuntimeIntegration::new(tpu_config);
        assert_eq!(runtime.integration_stats.executables_created, 0);
        assert_eq!(runtime.integration_stats.total_executions, 0);
        assert!(runtime.runtime_config.async_execution);
    }

    #[test]
    fn test_device_manager_creation() {
        use crate::main_types::{PodTopology, TPUConfig, TPUVersion};

        let tpu_config = TPUConfig {
            tpu_version: TPUVersion::V4,
            num_cores: 8,
            enable_xla: true,
            xla_optimization_level: crate::main_types::XLAOptimizationLevel::Standard,
            mixed_precision: true,
            batch_size_per_core: 32,
            enable_pod_coordination: false,
            pod_topology: PodTopology::Pod2x2,
            memory_optimization: crate::main_types::TPUMemoryOptimization::Balanced,
            gradient_compression: true,
            prefetch_depth: 2,
            experimental_features: false,
        };

        let device_manager = DeviceManager::new(&tpu_config);
        // Pod2x2 topology creates 4 devices (2x2 grid)
        assert_eq!(device_manager.available_devices.len(), 4);

        for device in &device_manager.available_devices {
            assert!(matches!(device.state, DeviceState::Available));
            assert_eq!(device.version, TPUVersion::V4);
        }
    }
}