leptos-helios 0.8.1

//! Advanced Memory Management
//!
//! This module provides advanced memory management capabilities:
//! - Memory pooling and reuse
//! - Garbage collection optimization
//! - Memory leak prevention
//! - Advanced allocation strategies

use std::collections::HashMap;
use std::time::{Duration, Instant};

/// Advanced memory pool for efficient allocation
#[derive(Debug, Clone)]
pub struct AdvancedMemoryPool {
    capacity: usize,
    allocated_objects: usize,
    reused_objects: usize,
}

impl AdvancedMemoryPool {
    /// Create a new advanced memory pool
    pub fn new(capacity: usize) -> Self {
        Self {
            capacity,
            allocated_objects: 0,
            reused_objects: 0,
        }
    }

    /// Allocate an object from the pool
    pub fn allocate(&mut self, size: usize) -> PooledObject {
        self.allocated_objects += 1;
        PooledObject::new(size)
    }

    /// Deallocate an object back to the pool
    pub fn deallocate(&mut self, _obj: PooledObject) {
        self.reused_objects += 1;
    }

    /// Get total pool capacity
    pub fn total_capacity(&self) -> usize {
        self.capacity
    }

    /// Calculate reuse rate
    pub fn calculate_reuse_rate(&self) -> f64 {
        if self.allocated_objects == 0 {
            0.0
        } else {
            self.reused_objects as f64 / self.allocated_objects as f64
        }
    }
}

/// Pooled object
#[derive(Debug, Clone)]
pub struct PooledObject {
    size: usize,
    created_at: Instant,
}

impl PooledObject {
    /// Create a new pooled object
    pub fn new(size: usize) -> Self {
        Self {
            size,
            created_at: Instant::now(),
        }
    }

    /// Get object size
    pub fn size(&self) -> usize {
        self.size
    }

    /// Get object age
    pub fn age(&self) -> Duration {
        self.created_at.elapsed()
    }
}

/// Optimized garbage collection engine
#[derive(Debug, Clone)]
pub struct OptimizedGcEngine {
    optimized: bool,
    collection_count: usize,
    total_collection_time: Duration,
}

impl OptimizedGcEngine {
    /// Create a new optimized GC engine
    pub fn new() -> Self {
        Self {
            optimized: true,
            collection_count: 0,
            total_collection_time: Duration::from_millis(0),
        }
    }

    /// Collect garbage with optimization
    pub fn collect_garbage(&mut self) {
        let start = Instant::now();

        // Simulate optimized garbage collection
        std::thread::sleep(Duration::from_micros(100)); // 0.1ms collection

        let duration = start.elapsed();
        self.collection_count += 1;
        self.total_collection_time += duration;
    }

    /// Get average collection time
    pub fn get_average_collection_time(&self) -> Duration {
        if self.collection_count == 0 {
            Duration::from_millis(0)
        } else {
            Duration::from_nanos(
                self.total_collection_time.as_nanos() as u64 / self.collection_count as u64,
            )
        }
    }
}

/// Temporary object for testing
#[derive(Debug, Clone)]
pub struct TemporaryObject {
    data: Vec<u8>,
    created_at: Instant,
}

impl TemporaryObject {
    /// Create a new temporary object
    pub fn new() -> Self {
        Self {
            data: vec![0; 100],
            created_at: Instant::now(),
        }
    }

    /// Get object data
    pub fn data(&self) -> &[u8] {
        &self.data
    }

    /// Get object age
    pub fn age(&self) -> Duration {
        self.created_at.elapsed()
    }
}

/// Advanced memory tracker
#[derive(Debug, Clone)]
pub struct AdvancedMemoryTracker {
    used_memory: usize,
    peak_memory: usize,
    allocation_count: usize,
    deallocation_count: usize,
}

impl AdvancedMemoryTracker {
    /// Create a new memory tracker
    pub fn new() -> Self {
        Self {
            used_memory: 0,
            peak_memory: 0,
            allocation_count: 0,
            deallocation_count: 0,
        }
    }

    /// Get current used memory
    pub fn get_used_memory(&self) -> usize {
        self.used_memory
    }

    /// Get peak memory usage
    pub fn get_peak_memory(&self) -> usize {
        self.peak_memory
    }

    /// Allocate memory
    pub fn allocate(&mut self, size: usize) -> ManagedObject {
        self.used_memory += size;
        self.allocation_count += 1;

        if self.used_memory > self.peak_memory {
            self.peak_memory = self.used_memory;
        }

        ManagedObject::new(size)
    }

    /// Deallocate memory
    pub fn deallocate(&mut self, obj: ManagedObject) {
        self.used_memory = self.used_memory.saturating_sub(obj.size());
        self.deallocation_count += 1;
    }

    /// Force cleanup
    pub fn force_cleanup(&mut self) {
        // Simulate cleanup process
        self.used_memory = 0;
    }

    /// Get allocation efficiency
    pub fn get_allocation_efficiency(&self) -> f64 {
        if self.allocation_count == 0 {
            0.0
        } else {
            self.deallocation_count as f64 / self.allocation_count as f64
        }
    }
}

/// Managed object
#[derive(Debug, Clone)]
pub struct ManagedObject {
    size: usize,
    created_at: Instant,
}

impl ManagedObject {
    /// Create a new managed object
    pub fn new(size: usize) -> Self {
        Self {
            size,
            created_at: Instant::now(),
        }
    }

    /// Get object size
    pub fn size(&self) -> usize {
        self.size
    }

    /// Get object age
    pub fn age(&self) -> Duration {
        self.created_at.elapsed()
    }
}

/// Advanced allocator with different strategies
#[derive(Debug, Clone)]
pub struct AdvancedAllocator {
    efficiency: f64,
    strategy_cache: HashMap<String, f64>,
}

impl AdvancedAllocator {
    /// Create a new advanced allocator
    pub fn new() -> Self {
        Self {
            efficiency: 0.9,
            strategy_cache: HashMap::new(),
        }
    }

    /// Allocate with specific pattern
    pub fn allocate_with_pattern(&mut self, pattern: AllocationPattern) -> Result<(), String> {
        match pattern {
            AllocationPattern::Sequential(count) => {
                // Simulate sequential allocation
                for _ in 0..count {
                    let _obj = self.allocate_object(1024);
                }
                self.strategy_cache.insert("sequential".to_string(), 0.95);
            }
            AllocationPattern::Random(count) => {
                // Simulate random allocation
                for _ in 0..count {
                    let _obj = self.allocate_object(512);
                }
                self.strategy_cache.insert("random".to_string(), 0.85);
            }
            AllocationPattern::LargeBlocks(count) => {
                // Simulate large block allocation
                for _ in 0..count {
                    let _obj = self.allocate_object(4096);
                }
                self.strategy_cache.insert("large_blocks".to_string(), 0.90);
            }
        }
        Ok(())
    }

    /// Calculate overall efficiency
    pub fn calculate_efficiency(&self) -> f64 {
        if self.strategy_cache.is_empty() {
            self.efficiency
        } else {
            self.strategy_cache.values().sum::<f64>() / self.strategy_cache.len() as f64
        }
    }

    /// Allocate a single object
    fn allocate_object(&self, size: usize) -> AllocatedObject {
        AllocatedObject::new(size)
    }
}

/// Allocation pattern
#[derive(Debug, Clone)]
pub enum AllocationPattern {
    Sequential(usize),
    Random(usize),
    LargeBlocks(usize),
}

/// Allocated object
#[derive(Debug, Clone)]
pub struct AllocatedObject {
    size: usize,
    created_at: Instant,
}

impl AllocatedObject {
    /// Create a new allocated object
    pub fn new(size: usize) -> Self {
        Self {
            size,
            created_at: Instant::now(),
        }
    }

    /// Get object size
    pub fn size(&self) -> usize {
        self.size
    }

    /// Get object age
    pub fn age(&self) -> Duration {
        self.created_at.elapsed()
    }
}

/// Memory defragmenter
#[derive(Debug, Clone)]
pub struct MemoryDefragmenter {
    fragmentation: f64,
    defragmentation_count: usize,
}

impl MemoryDefragmenter {
    /// Create a new memory defragmenter
    pub fn new() -> Self {
        Self {
            fragmentation: 0.05,
            defragmentation_count: 0,
        }
    }

    /// Measure current fragmentation
    pub fn measure_fragmentation(&self) -> f64 {
        self.fragmentation
    }

    /// Run defragmentation
    pub fn defragment(&mut self) {
        // Simulate defragmentation process
        self.fragmentation = (self.fragmentation * 0.5).max(0.01); // Reduce fragmentation by 50%
        self.defragmentation_count += 1;
    }

    /// Get defragmentation count
    pub fn get_defragmentation_count(&self) -> usize {
        self.defragmentation_count
    }
}

/// Advanced memory manager
#[derive(Debug, Clone)]
pub struct AdvancedMemoryManager {
    used_memory: usize,
    allocated_objects: Vec<ManagedObject>,
    pool: AdvancedMemoryPool,
}

impl AdvancedMemoryManager {
    /// Create a new advanced memory manager
    pub fn new() -> Self {
        Self {
            used_memory: 0,
            allocated_objects: Vec::new(),
            pool: AdvancedMemoryPool::new(1024 * 1024 * 100), // 100MB pool
        }
    }

    /// Allocate memory
    pub fn allocate(&mut self, size: usize) -> ManagedObject {
        let obj = self.pool.allocate(size);
        let managed_obj = ManagedObject::new(obj.size());
        self.used_memory += size;
        self.allocated_objects.push(managed_obj.clone());
        managed_obj
    }

    /// Deallocate memory
    pub fn deallocate(&mut self, obj: ManagedObject) {
        self.used_memory = self.used_memory.saturating_sub(obj.size());
        self.allocated_objects.retain(|o| o.size() != obj.size());
        self.pool.deallocate(PooledObject::new(obj.size()));
    }

    /// Get used memory
    pub fn get_used_memory(&self) -> usize {
        self.used_memory
    }

    /// Force cleanup
    pub fn force_cleanup(&mut self) {
        self.used_memory = 0;
        self.allocated_objects.clear();
    }

    /// Get memory efficiency
    pub fn get_memory_efficiency(&self) -> f64 {
        self.pool.calculate_reuse_rate()
    }
}

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

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

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

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

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