Mountain/IPC/

AdvancedFeatures.rs

//! # Advanced IPC Features - Enhanced Synchronization & Collaboration
//!
//! **File Responsibilities:**
//! This module provides advanced features for the IPC layer that go beyond
//! basic communication. It implements real-time collaboration support,
//! performance optimization through caching, and enhanced monitoring
//! capabilities.
//!
//! **Architectural Role in Wind-Mountain Connection:**
//!
//! The AdvancedFeatures module extends the IPC layer with:
//!
//! 1. **Real-time Collaboration:** Support for multi-user collaborative editing
//!    - Session management for collaborative workspaces
//!    - Participant tracking and permission management
//!    - Real-time document change broadcasting
//!
//! 2. **Performance Optimization:** Intelligent caching to reduce redundant
//!    operations
//!    - Message caching with TTL (Time-To-Live)
//!    - Cache hit/miss tracking and analytics
//!    - Automatic cleanup of expired cache entries
//!
//! 3. **Advanced Monitoring:** Detailed performance tracking and metrics
//!    - Message rate calculations (MPS - Messages Per Second)
//!    - Latency tracking (average, peak)
//!    - Error rate monitoring
//!    - Connection uptime tracking
//!
//! 4. **Background Services:** Continuous monitoring and cleanup tasks
//!    - Periodic performance metrics calculation
//!    - Cache cleanup at regular intervals
//!    - Session monitoring for inactivity
//!
//! **Key Features:**
//!
//! **1. Collaboration Support:**
//!
//! **CollaborationSessions:**
//! ```rust
//! CollaborationSession {
//!     session_id: String,
//!     participants: Vec<String>,
//!     active_documents: Vec<String>,
//!     last_activity: u64,
//!     permissions: CollaborationPermissions,
//! }
//! ```
//!
//! **Permissions:**
//! - `can_edit`: Allow editing
//! - `can_view`: Read-only access
//! - `can_comment`: Allow comments
//! - `can_share`: Allow inviting others
//!
//! **Session Management:**
//! - `create_collaboration_session()` - Create new session
//! - `add_participant()` - Add user to session
//! - `monitor_collaboration_sessions()` - Track active sessions
//! - Automatic session cleanup on inactivity (5 minutes)
//!
//! **2. Message Caching:**
//!
//! **Cache Structure:**
//! ```rust
//! MessageCache {
//!     cached_messages: HashMap<String, CachedMessage>,
//!     cache_hits: u64,
//!     cache_misses: u64,
//!     cache_size: usize,
//! }
//! ```
//!
//! **CachedMessage:**
//! ```rust
//! CachedMessage {
//! 	data:serde_json::Value,
//! 	timestamp:u64,
//! 	ttl:u64, // Time to live in seconds
//! }
//! ```
//!
//! **Cache Operations:**
//! - `cache_message(id, data, ttl)` - Store message
//! - `get_cached_message(id)` - Retrieve message
//! - Automatic TTL-based expiration
//! - Periodic cleanup every 60 seconds
//!
//! **Cache Effectiveness:**
//! ```rust
//! cache_hit_rate = cache_hits / (cache_hits + cache_misses) 
//! ```
//!
//! **3. Performance Monitoring:**
//!
//! **Metrics Tracked:**
//! - `total_messages_sent` - Outgoing message count
//! - `total_messages_received` - Incoming message count
//! - `average_processing_time_ms` - Mean latency
//! - `peak_message_rate` - Maximum observed rate
//! - `error_count` - Total errors
//! - `connection_uptime` - Time connected
//!
//! **Calculations:**
//!
//! **Average Processing Time:**
//! ```rust
//! new_avg = old_avg * (n - 1) / n + current_time / n 
//! ```
//!
//! **Message Rate:**
//! ```text
//! messages_per_second = total_messages / time_window_seconds
//! ```
//!
//! **4. Background Services:**
//!
//! **Performance Monitoring (Every 10 seconds):**
//! - Calculate current performance metrics
//! - Emit metrics to Sky via IPC events
//! - Update connection uptime
//!
//! **Cache Cleanup (Every 60 seconds):**
//! - Remove expired cache entries
//! - Update cache size count
//! - Log cleanup statistics
//!
//! **Session Monitoring (Every 30 seconds):**
//! - Remove inactive sessions (5+ minutes idle)
//! - Emit session updates to subscribers
//! - Track session count
//!
//! **Tauri Commands:**
//!
//! - `mountain_get_performance_stats` - Get performance metrics
//! - `mountain_get_cache_stats` - Get cache statistics
//! - `mountain_create_collaboration_session` - Create collaboration session
//! - `mountain_get_collaboration_sessions` - Get all active sessions
//!
//! **Events Emitted:**
//!
//! - `ipc-performance-stats` - Performance metrics update
//! - `collaboration-sessions-update` - Active sessions list
//!
//! **Initialization:**
//!
//! ```text
//! // In Mountain setup
//! let features = AdvancedFeatures::new(runtime);
//! app_handle.manage(features.clone_features());
//! features.start_monitoring().await;
//! ```
//!
//! **Usage Examples:**
//!
//! **Caching a Message:**
//! ```text
//! features.cache_message(
//! "config:editor".to_string(),
//! serde_json::json!({ "theme": "dark" }),
//! 300 // 5 minutes TTL
//! ).await?;
//!
//! // Retrieve later
//! let cached = features.get_cached_message("config:editor").await;
//! ```
//!
//! **Creating a Collaboration Session:**
//! ```rust
//! let permissions = CollaborationPermissions {
//! 	can_edit:true,
//! 	can_view:true,
//! 	can_comment:true,
//! 	can_share:false,
//! };
//!
//! features
//! 	.create_collaboration_session("project-alpha".to_string(), permissions)
//! 	.await?;
//!
//! features.add_participant("project-alpha", "user123").await?;
//! ```
//!
//! **Monitoring Performance:**
//! ```rust
//! features.record_message_statistics(true, 15).await; // Sent, 15ms
//! let stats = features.get_performance_stats().await?;
//! println!("Average latency: {}ms", stats.average_processing_time_ms);
//! ```
//!
//! **Integration with StatusReporter:**
//!
//! The AdvancedFeatures module works with StatusReporter:
//! - StatusReporter can call this module for detailed metrics
//! - Both modules emit events to Sky for monitoring
//! - Complementary monitoring at different levels
//!
//! **Advanced Features Future Enhancements:**
//!
//! - **Intelligent Caching:** LRU cache eviction, predictive caching
//! - **Collaboration Cursors:** Real-time cursor position sharing
//! - **Conflict Resolution:** Automatic conflict detection and resolution
//! - **Presence Indicators:** Show who is viewing/editing documents
//! - **Change History:** Track all collaborative changes with authors

use std::{
	collections::HashMap,
	sync::{Arc, Mutex},
	time::{Duration, SystemTime},
};

use log::{debug, error, info, trace, warn};
use serde::{Deserialize, Serialize};
use tokio::time::interval;
use tauri::{AppHandle, Emitter, Manager};

use crate::RunTime::ApplicationRunTime::ApplicationRunTime;

/// Advanced IPC features for enhanced Mountain-Wind synchronization
#[derive(Clone)]
pub struct AdvancedFeatures {
	runtime:Arc<ApplicationRunTime>,
	performance_stats:Arc<Mutex<PerformanceStats>>,
	collaboration_sessions:Arc<Mutex<HashMap<String, CollaborationSession>>>,
	message_cache:Arc<Mutex<MessageCache>>,
}

/// Performance statistics for IPC monitoring
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceStats {
	pub total_messages_sent:u64,
	pub total_messages_received:u64,
	pub average_processing_time_ms:f64,
	pub peak_message_rate:u32,
	pub error_count:u32,
	pub last_update:u64,
	pub connection_uptime:u64,
}

/// Real-time collaboration session
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CollaborationSession {
	pub session_id:String,
	pub participants:Vec<String>,
	pub active_documents:Vec<String>,
	pub last_activity:u64,
	pub permissions:CollaborationPermissions,
}

/// Collaboration permissions
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CollaborationPermissions {
	pub can_edit:bool,
	pub can_view:bool,
	pub can_comment:bool,
	pub can_share:bool,
}

/// Message cache for performance optimization
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MessageCache {
	pub cached_messages:HashMap<String, CachedMessage>,
	pub cache_hits:u64,
	pub cache_misses:u64,
	pub cache_size:usize,
}

/// Cached message with timestamp
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CachedMessage {
	pub data:serde_json::Value,
	/// Unix timestamp in seconds when this message was cached
	pub timestamp:u64,
	/// Time-to-live in seconds for cache entry expiration
	pub ttl:u64,
}

impl AdvancedFeatures {
	/// Create new advanced features instance
	pub fn new(runtime:Arc<ApplicationRunTime>) -> Self {
		info!("[AdvancedFeatures] Initializing advanced IPC features");

		Self {
			runtime,
			performance_stats:Arc::new(Mutex::new(PerformanceStats {
				total_messages_sent:0,
				total_messages_received:0,
				average_processing_time_ms:0.0,
				peak_message_rate:0,
				error_count:0,
				last_update:SystemTime::now()
					.duration_since(SystemTime::UNIX_EPOCH)
					.unwrap_or_default()
					.as_secs(),
				connection_uptime:0,
			})),
			collaboration_sessions:Arc::new(Mutex::new(HashMap::new())),
			message_cache:Arc::new(Mutex::new(MessageCache {
				cached_messages:HashMap::new(),
				cache_hits:0,
				cache_misses:0,
				cache_size:0,
			})),
		}
	}

	/// Start advanced monitoring
	pub async fn start_monitoring(&self) -> Result<(), String> {
		info!("[AdvancedFeatures] Starting advanced monitoring");

		let features1 = self.clone_features();
		let features2 = self.clone_features();
		let features3 = self.clone_features();

		// Start performance monitoring
		tokio::spawn(async move {
			features1.monitor_performance().await;
		});

		// Start cache cleanup
		tokio::spawn(async move {
			features2.cleanup_cache().await;
		});

		// Start collaboration session monitoring
		tokio::spawn(async move {
			features3.monitor_collaboration_sessions().await;
		});

		Ok(())
	}

	/// Monitor performance statistics
	async fn monitor_performance(&self) {
		let mut interval = interval(Duration::from_secs(10));

		loop {
			interval.tick().await;

			let stats = self.calculate_performance_stats().await;

			// Emit performance stats to Sky
			if let Err(e) = self.runtime.Environment.ApplicationHandle.emit("ipc-performance-stats", &stats) {
				error!("[AdvancedFeatures] Failed to emit performance stats: {}", e);
			}

			debug!("[AdvancedFeatures] Performance stats updated");
		}
	}

	/// Calculate performance statistics
	async fn calculate_performance_stats(&self) -> PerformanceStats {
		let mut stats = self.performance_stats.lock().unwrap();

		// Update connection uptime
		stats.connection_uptime = SystemTime::now()
			.duration_since(SystemTime::UNIX_EPOCH)
			.unwrap_or_default()
			.as_secs()
			- stats.last_update;

		stats.last_update = SystemTime::now()
			.duration_since(SystemTime::UNIX_EPOCH)
			.unwrap_or_default()
			.as_secs();

		stats.clone()
	}

	/// Cleanup expired cache entries
	async fn cleanup_cache(&self) {
		let mut interval = interval(Duration::from_secs(60));

		loop {
			interval.tick().await;

			let current_time = SystemTime::now()
				.duration_since(SystemTime::UNIX_EPOCH)
				.unwrap_or_default()
				.as_secs();

			let mut cache = self.message_cache.lock().unwrap();

			cache
				.cached_messages
				.retain(|_, cached_message| current_time < cached_message.timestamp + cached_message.ttl);

			cache.cache_size = cache.cached_messages.len();

			debug!("[AdvancedFeatures] Cache cleaned, {} entries remaining", cache.cache_size);
		}
	}

	/// Monitor collaboration sessions
	async fn monitor_collaboration_sessions(&self) {
		let mut interval = interval(Duration::from_secs(30));

		loop {
			interval.tick().await;

			let current_time = SystemTime::now()
				.duration_since(SystemTime::UNIX_EPOCH)
				.unwrap_or_default()
				.as_secs();

			let mut sessions = self.collaboration_sessions.lock().unwrap();

			// Remove inactive sessions
			sessions.retain(|_, session| {
				current_time - session.last_activity < 300 // 5 minutes inactivity
			});

			// Emit session updates
			let active_sessions:Vec<CollaborationSession> = sessions.values().cloned().collect();

			if let Err(e) = self
				.runtime
				.Environment
				.ApplicationHandle
				.emit("collaboration-sessions-update", &active_sessions)
			{
				error!("[AdvancedFeatures] Failed to emit collaboration sessions: {}", e);
			}

			debug!("[AdvancedFeatures] Collaboration sessions monitored, {} active", sessions.len());
		}
	}

	/// Cache a message for future reuse
	pub async fn cache_message(&self, message_id:String, data:serde_json::Value, ttl:u64) -> Result<(), String> {
		let mut cache = self
			.message_cache
			.lock()
			.map_err(|e| format!("Failed to access message cache: {}", e))?;

		let cached_message = CachedMessage {
			data,
			timestamp:SystemTime::now()
				.duration_since(SystemTime::UNIX_EPOCH)
				.unwrap_or_default()
				.as_secs(),
			ttl,
		};

		cache.cached_messages.insert(message_id.clone(), cached_message);
		cache.cache_size = cache.cached_messages.len();

		debug!("[AdvancedFeatures] Message cached: {}, TTL: {}s", message_id, ttl);
		Ok(())
	}

	/// Get cached message
	pub async fn get_cached_message(&self, message_id:&str) -> Option<serde_json::Value> {
		let mut cache = self.message_cache.lock().unwrap();

		let result = cache
			.cached_messages
			.get(message_id)
			.map(|cached_message| cached_message.data.clone());

		// Update cache statistics
		if result.is_some() {
			cache.cache_hits += 1;
		} else {
			cache.cache_misses += 1;
		}

		result
	}

	/// Create collaboration session
	pub async fn create_collaboration_session(
		&self,
		session_id:String,
		permissions:CollaborationPermissions,
	) -> Result<(), String> {
		let mut sessions = self
			.collaboration_sessions
			.lock()
			.map_err(|e| format!("Failed to access collaboration sessions: {}", e))?;

		let session = CollaborationSession {
			session_id:session_id.clone(),
			participants:Vec::new(),
			active_documents:Vec::new(),
			last_activity:SystemTime::now()
				.duration_since(SystemTime::UNIX_EPOCH)
				.unwrap_or_default()
				.as_secs(),
			permissions,
		};

		sessions.insert(session_id, session);

		info!("[AdvancedFeatures] Collaboration session created");
		Ok(())
	}

	/// Add participant to collaboration session
	pub async fn add_participant(&self, session_id:&str, participant:String) -> Result<(), String> {
		let mut sessions = self
			.collaboration_sessions
			.lock()
			.map_err(|e| format!("Failed to access collaboration sessions: {}", e))?;

		if let Some(session) = sessions.get_mut(session_id) {
			if !session.participants.contains(&participant) {
				session.participants.push(participant);
				session.last_activity = SystemTime::now()
					.duration_since(SystemTime::UNIX_EPOCH)
					.unwrap_or_default()
					.as_secs();

				debug!("[AdvancedFeatures] Participant added to session: {}", session_id);
			}
		} else {
			return Err(format!("Session not found: {}", session_id));
		}

		Ok(())
	}

	/// Record message statistics
	pub async fn record_message_statistics(&self, sent:bool, processing_time_ms:u64) {
		let mut stats = self.performance_stats.lock().unwrap();

		if sent {
			stats.total_messages_sent += 1;
		} else {
			stats.total_messages_received += 1;
		}

		// Update average processing time
		let total_messages = stats.total_messages_sent + stats.total_messages_received;
		stats.average_processing_time_ms = (stats.average_processing_time_ms * (total_messages - 1) as f64
			+ processing_time_ms as f64)
			/ total_messages as f64;
	}

	/// Record error
	pub async fn record_error(&self) {
		let mut stats = self.performance_stats.lock().unwrap();
		stats.error_count += 1;
	}

	/// Get performance statistics
	pub async fn get_performance_stats(&self) -> Result<PerformanceStats, String> {
		Ok(self.calculate_performance_stats().await)
	}

	/// Get cache statistics
	pub async fn get_cache_stats(&self) -> Result<MessageCache, String> {
		let cache = self.message_cache.lock().unwrap();
		Ok(cache.clone())
	}

	/// Get active collaboration sessions
	pub async fn get_collaboration_sessions(&self) -> Vec<CollaborationSession> {
		let sessions = self.collaboration_sessions.lock().unwrap();
		sessions.values().cloned().collect()
	}

	/// Clone features for async tasks
	fn clone_features(&self) -> AdvancedFeatures {
		AdvancedFeatures {
			runtime:self.runtime.clone(),
			performance_stats:self.performance_stats.clone(),
			collaboration_sessions:self.collaboration_sessions.clone(),
			message_cache:self.message_cache.clone(),
		}
	}
}

/// Tauri command to get performance statistics
#[tauri::command]
pub async fn mountain_get_performance_stats(app_handle:tauri::AppHandle) -> Result<PerformanceStats, String> {
	debug!("[AdvancedFeatures] Tauri command: get_performance_stats");

	if let Some(features) = app_handle.try_state::<AdvancedFeatures>() {
		Ok(features.get_performance_stats().await?)
	} else {
		Err("AdvancedFeatures not found in application state".to_string())
	}
}

/// Tauri command to get cache statistics
#[tauri::command]
pub async fn mountain_get_cache_stats(app_handle:tauri::AppHandle) -> Result<MessageCache, String> {
	debug!("[AdvancedFeatures] Tauri command: get_cache_stats");

	if let Some(features) = app_handle.try_state::<AdvancedFeatures>() {
		Ok(features.get_cache_stats().await?)
	} else {
		Err("AdvancedFeatures not found in application state".to_string())
	}
}

/// Tauri command to create collaboration session
#[tauri::command]
pub async fn mountain_create_collaboration_session(
	app_handle:tauri::AppHandle,
	session_id:String,
	permissions:CollaborationPermissions,
) -> Result<(), String> {
	debug!("[AdvancedFeatures] Tauri command: create_collaboration_session");

	if let Some(features) = app_handle.try_state::<AdvancedFeatures>() {
		features.create_collaboration_session(session_id, permissions).await
	} else {
		Err("AdvancedFeatures not found in application state".to_string())
	}
}

/// Tauri command to get collaboration sessions
#[tauri::command]
pub async fn mountain_get_collaboration_sessions(
	app_handle:tauri::AppHandle,
) -> Result<Vec<CollaborationSession>, String> {
	debug!("[AdvancedFeatures] Tauri command: get_collaboration_sessions");

	if let Some(features) = app_handle.try_state::<AdvancedFeatures>() {
		Ok(features.get_collaboration_sessions().await)
	} else {
		Err("AdvancedFeatures not found in application state".to_string())
	}
}

/// Initialize advanced features in Mountain's setup
pub fn initialize_advanced_features(
	app_handle:&tauri::AppHandle,
	runtime:Arc<ApplicationRunTime>,
) -> Result<(), String> {
	info!("[AdvancedFeatures] Initializing advanced IPC features");

	let features = AdvancedFeatures::new(runtime);

	// Store in application state
	app_handle.manage(features.clone_features());

	// Start monitoring - clone features before moving into async block
	let features_clone = features.clone();
	tokio::spawn(async move {
		if let Err(e) = features_clone.start_monitoring().await {
			error!("[AdvancedFeatures] Failed to start monitoring: {}", e);
		}
	});

	Ok(())
}