scirs2-metrics 0.3.2

//! Memory systems for neuromorphic computing
//!
//! This module provides short-term and long-term memory systems
//! with consolidation and recall mechanisms.

#![allow(clippy::too_many_arguments)]
#![allow(dead_code)]

use scirs2_core::numeric::Float;
use std::collections::{HashMap, VecDeque};
use std::time::{Duration, Instant};

/// Neuromorphic memory system
#[derive(Debug)]
pub struct NeuromorphicMemory<F: Float> {
    /// Short-term memory (working memory)
    pub short_term_memory: ShortTermMemory<F>,
    /// Long-term memory
    pub long_term_memory: LongTermMemory<F>,
    /// Memory consolidation controller
    pub consolidation_controller: ConsolidationController<F>,
    /// Memory recall mechanisms
    pub recall_mechanisms: RecallMechanisms<F>,
}

/// Short-term memory implementation
#[derive(Debug)]
pub struct ShortTermMemory<F: Float> {
    /// Current working memory contents
    pub working_memory: VecDeque<MemoryTrace<F>>,
    /// Capacity limit
    pub capacity: usize,
    /// Decay rate
    pub decay_rate: F,
    /// Refresh mechanisms
    pub refresh_controller: RefreshController<F>,
}

/// Long-term memory implementation
#[derive(Debug)]
pub struct LongTermMemory<F: Float> {
    /// Stored memory traces
    pub memory_traces: HashMap<String, MemoryTrace<F>>,
    /// Memory strength decay
    pub decay_rate: F,
    /// Consolidation threshold
    pub consolidation_threshold: F,
}

/// Memory trace representation
#[derive(Debug, Clone)]
pub struct MemoryTrace<F: Float> {
    pub id: String,
    pub content: Vec<F>,
    pub strength: F,
    pub timestamp: Instant,
    pub access_count: usize,
    pub consolidation_level: F,
}

/// Memory consolidation controller
#[derive(Debug)]
pub struct ConsolidationController<F: Float> {
    /// Consolidation policies
    pub policies: Vec<ConsolidationPolicy>,
    /// Consolidation thresholds
    pub thresholds: HashMap<String, F>,
    /// Replay controller
    pub replay_controller: ReplayController<F>,
}

/// Memory consolidation policies
#[derive(Debug, Clone)]
pub enum ConsolidationPolicy {
    /// Time-based consolidation
    TimeBased { interval: Duration },
    /// Strength-based consolidation
    StrengthBased { threshold: f64 },
    /// Access-based consolidation
    AccessBased { min_access: usize },
    /// Combined policies
    Combined { policies: Vec<ConsolidationPolicy> },
}

/// Replay controller for memory consolidation
#[derive(Debug)]
pub struct ReplayController<F: Float> {
    /// Replay sequences
    pub replay_sequences: VecDeque<ReplaySequence<F>>,
    /// Replay patterns
    pub replay_patterns: Vec<ReplayPattern>,
    /// Replay scheduling
    pub scheduling: ReplayScheduling,
}

/// Memory replay sequence
#[derive(Debug, Clone)]
pub struct ReplaySequence<F: Float> {
    pub memory_ids: Vec<String>,
    pub replay_strength: F,
    pub temporal_compression: F,
}

/// Replay patterns
#[derive(Debug, Clone)]
pub enum ReplayPattern {
    Forward,
    Backward,
    Random,
    Priority,
}

/// Replay scheduling
#[derive(Debug, Clone)]
pub enum ReplayScheduling {
    Continuous,
    Sleep,
    Idle,
    Triggered,
}

/// Memory recall mechanisms
#[derive(Debug)]
pub struct RecallMechanisms<F: Float> {
    /// Associative recall
    pub associative_recall: AssociativeRecall<F>,
    /// Content-addressable recall
    pub content_recall: ContentAddressableRecall<F>,
    /// Context-dependent recall
    pub context_recall: ContextDependentRecall<F>,
}

/// Associative memory recall
#[derive(Debug)]
pub struct AssociativeRecall<F: Float> {
    pub association_matrix: HashMap<String, HashMap<String, F>>,
    pub recall_threshold: F,
}

/// Content-addressable memory recall
#[derive(Debug)]
pub struct ContentAddressableRecall<F: Float> {
    pub content_index: HashMap<Vec<F>, String>,
    pub similarity_threshold: F,
}

/// Context-dependent memory recall
#[derive(Debug)]
pub struct ContextDependentRecall<F: Float> {
    pub context_associations: HashMap<String, Vec<String>>,
    pub context_weights: HashMap<String, F>,
}

/// Refresh controller for short-term memory
#[derive(Debug)]
pub struct RefreshController<F: Float> {
    pub refresh_rate: Duration,
    pub last_refresh: Instant,
    pub refresh_strength: F,
}

impl<F: Float> NeuromorphicMemory<F> {
    /// Create new neuromorphic memory system
    pub fn new(capacity: usize) -> Self {
        Self {
            short_term_memory: ShortTermMemory::new(capacity),
            long_term_memory: LongTermMemory::new(),
            consolidation_controller: ConsolidationController::new(),
            recall_mechanisms: RecallMechanisms::new(),
        }
    }

    /// Store new memory
    pub fn store(&mut self, content: Vec<F>, strength: F) -> crate::error::Result<String> {
        let memory_id = format!("mem_{}", Instant::now().elapsed().as_nanos());
        let trace = MemoryTrace {
            id: memory_id.clone(),
            content,
            strength,
            timestamp: Instant::now(),
            access_count: 0,
            consolidation_level: F::zero(),
        };

        // Store in short-term memory first
        self.short_term_memory.store(trace)?;

        Ok(memory_id)
    }

    /// Recall memory by ID
    pub fn recall(&mut self, memory_id: &str) -> crate::error::Result<Option<MemoryTrace<F>>> {
        // Try short-term memory first
        if let Some(trace) = self.short_term_memory.recall(memory_id)? {
            return Ok(Some(trace));
        }

        // Try long-term memory
        if let Some(trace) = self.long_term_memory.recall(memory_id)? {
            return Ok(Some(trace));
        }

        Ok(None)
    }

    /// Update memory system
    pub fn update(&mut self, dt: Duration) -> crate::error::Result<()> {
        // Update short-term memory
        self.short_term_memory.update(dt)?;

        // Update long-term memory
        self.long_term_memory.update(dt)?;

        // Process consolidation
        self.consolidation_controller
            .update(&mut self.short_term_memory, &mut self.long_term_memory)?;

        Ok(())
    }
}

impl<F: Float> ShortTermMemory<F> {
    /// Create new short-term memory
    pub fn new(capacity: usize) -> Self {
        Self {
            working_memory: VecDeque::with_capacity(capacity),
            capacity,
            decay_rate: F::from(0.95).expect("Failed to convert constant to float"),
            refresh_controller: RefreshController::new(),
        }
    }

    /// Store memory trace
    pub fn store(&mut self, trace: MemoryTrace<F>) -> crate::error::Result<()> {
        if self.working_memory.len() >= self.capacity {
            self.working_memory.pop_front();
        }
        self.working_memory.push_back(trace);
        Ok(())
    }

    /// Recall memory by ID
    pub fn recall(&mut self, memory_id: &str) -> crate::error::Result<Option<MemoryTrace<F>>> {
        for trace in &mut self.working_memory {
            if trace.id == memory_id {
                trace.access_count += 1;
                return Ok(Some(trace.clone()));
            }
        }
        Ok(None)
    }

    /// Update short-term memory
    pub fn update(&mut self, dt: Duration) -> crate::error::Result<()> {
        // Apply decay to all traces
        for trace in &mut self.working_memory {
            trace.strength = trace.strength * self.decay_rate;
        }

        // Remove weak traces
        self.working_memory.retain(|trace| {
            trace.strength > F::from(0.01).expect("Failed to convert constant to float")
        });

        // Update refresh controller
        self.refresh_controller.update(dt)?;

        Ok(())
    }
}

impl<F: Float> LongTermMemory<F> {
    /// Create new long-term memory
    pub fn new() -> Self {
        Self {
            memory_traces: HashMap::new(),
            decay_rate: F::from(0.999).expect("Failed to convert constant to float"),
            consolidation_threshold: F::from(0.8).expect("Failed to convert constant to float"),
        }
    }

    /// Store memory trace
    pub fn store(&mut self, trace: MemoryTrace<F>) -> crate::error::Result<()> {
        self.memory_traces.insert(trace.id.clone(), trace);
        Ok(())
    }

    /// Recall memory by ID
    pub fn recall(&mut self, memory_id: &str) -> crate::error::Result<Option<MemoryTrace<F>>> {
        if let Some(trace) = self.memory_traces.get_mut(memory_id) {
            trace.access_count += 1;
            Ok(Some(trace.clone()))
        } else {
            Ok(None)
        }
    }

    /// Update long-term memory
    pub fn update(&mut self, dt: Duration) -> crate::error::Result<()> {
        // Apply slow decay to all traces
        for trace in self.memory_traces.values_mut() {
            trace.strength = trace.strength * self.decay_rate;
        }

        // Remove very weak traces
        self.memory_traces.retain(|_, trace| {
            trace.strength > F::from(0.001).expect("Failed to convert constant to float")
        });

        Ok(())
    }
}

impl<F: Float> ConsolidationController<F> {
    /// Create new consolidation controller
    pub fn new() -> Self {
        Self {
            policies: vec![ConsolidationPolicy::StrengthBased { threshold: 0.5 }],
            thresholds: HashMap::new(),
            replay_controller: ReplayController::new(),
        }
    }

    /// Update consolidation process
    pub fn update(
        &mut self,
        short_term: &mut ShortTermMemory<F>,
        long_term: &mut LongTermMemory<F>,
    ) -> crate::error::Result<()> {
        // Check for traces ready for consolidation
        let mut traces_to_consolidate = Vec::new();

        for trace in &short_term.working_memory {
            if self.should_consolidate(trace)? {
                traces_to_consolidate.push(trace.clone());
            }
        }

        // Move traces to long-term memory
        for trace in traces_to_consolidate {
            long_term.store(trace.clone())?;
            // Remove from short-term memory
            short_term.working_memory.retain(|t| t.id != trace.id);
        }

        Ok(())
    }

    /// Check if memory should be consolidated
    fn should_consolidate(&self, trace: &MemoryTrace<F>) -> crate::error::Result<bool> {
        for policy in &self.policies {
            match policy {
                ConsolidationPolicy::StrengthBased { threshold } => {
                    if trace.strength > F::from(*threshold).expect("Failed to convert to float") {
                        return Ok(true);
                    }
                }
                ConsolidationPolicy::AccessBased { min_access } => {
                    if trace.access_count >= *min_access {
                        return Ok(true);
                    }
                }
                ConsolidationPolicy::TimeBased { interval } => {
                    if trace.timestamp.elapsed() > *interval {
                        return Ok(true);
                    }
                }
                _ => {}
            }
        }
        Ok(false)
    }
}

impl<F: Float> RefreshController<F> {
    /// Create new refresh controller
    pub fn new() -> Self {
        Self {
            refresh_rate: Duration::from_millis(100),
            last_refresh: Instant::now(),
            refresh_strength: F::from(0.1).expect("Failed to convert constant to float"),
        }
    }

    /// Update refresh controller
    pub fn update(&mut self, dt: Duration) -> crate::error::Result<()> {
        self.last_refresh += dt;
        Ok(())
    }
}

impl<F: Float> ReplayController<F> {
    /// Create new replay controller
    pub fn new() -> Self {
        Self {
            replay_sequences: VecDeque::new(),
            replay_patterns: vec![ReplayPattern::Forward],
            scheduling: ReplayScheduling::Idle,
        }
    }
}

impl<F: Float> RecallMechanisms<F> {
    /// Create new recall mechanisms
    pub fn new() -> Self {
        Self {
            associative_recall: AssociativeRecall::new(),
            content_recall: ContentAddressableRecall::new(),
            context_recall: ContextDependentRecall::new(),
        }
    }
}

impl<F: Float> AssociativeRecall<F> {
    pub fn new() -> Self {
        Self {
            association_matrix: HashMap::new(),
            recall_threshold: F::from(0.7).expect("Failed to convert constant to float"),
        }
    }
}

impl<F: Float> ContentAddressableRecall<F> {
    pub fn new() -> Self {
        Self {
            content_index: HashMap::new(),
            similarity_threshold: F::from(0.8).expect("Failed to convert constant to float"),
        }
    }
}

impl<F: Float> ContextDependentRecall<F> {
    pub fn new() -> Self {
        Self {
            context_associations: HashMap::new(),
            context_weights: HashMap::new(),
        }
    }
}