leptos-helios 0.8.1

//! Data Streaming Optimization Module
//!
//! This module provides data streaming optimization features for the Helios charting library,
//! including data compression, streaming protocols, cache management, and network optimization.

use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;
use thiserror::Error;
use tokio::sync::RwLock;

/// Data streaming optimizer for performance optimization
#[derive(Debug, Clone)]
pub struct DataStreamingOptimizer {
    config: DataStreamingConfig,
    stats: Arc<RwLock<DataStreamingStats>>,
    compression_engine: Arc<RwLock<CompressionEngine>>,
    streaming_protocols: Arc<RwLock<HashMap<String, StreamingProtocol>>>,
    cache_manager: Arc<RwLock<CacheManager>>,
    network_optimizer: Arc<RwLock<NetworkOptimizer>>,
}

/// Configuration for data streaming optimization
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DataStreamingConfig {
    pub enable_compression: bool,
    pub enable_streaming_protocols: bool,
    pub enable_cache_management: bool,
    pub enable_network_optimization: bool,
    pub compression_algorithm: CompressionAlgorithm,
    pub streaming_protocol: StreamingProtocolType,
    pub cache_size: usize,
    pub cache_ttl: u64,
    pub network_timeout: u64,
    pub max_bandwidth: usize,
}

/// Compression algorithms
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum CompressionAlgorithm {
    None,
    Gzip,
    Brotli,
    LZ4,
    Zstd,
    Deflate,
}

/// Streaming protocol types
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum StreamingProtocolType {
    HTTP,
    WebSocket,
    ServerSentEvents,
    WebRTC,
    QUIC,
}

/// Compression engine for data optimization
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompressionEngine {
    pub algorithm: CompressionAlgorithm,
    pub compression_ratio: f64,
    pub compression_time: f64,
    pub decompression_time: f64,
    pub total_compressed_size: usize,
    pub total_original_size: usize,
    pub compression_efficiency: f64,
    pub bandwidth_savings: f64,
}

/// Streaming protocol information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StreamingProtocol {
    pub protocol_id: String,
    pub protocol_type: StreamingProtocolType,
    pub latency: f64,
    pub throughput: f64,
    pub reliability: f64,
    pub efficiency: f64,
    pub connection_count: u32,
    pub data_transferred: usize,
}

/// Cache manager for data caching
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheManager {
    pub cache_size: usize,
    pub cache_usage: usize,
    pub cache_hits: u64,
    pub cache_misses: u64,
    pub cache_hit_ratio: f64,
    pub cache_evictions: u64,
    pub cache_efficiency: f64,
    pub average_access_time: f64,
}

/// Network optimizer for network performance
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NetworkOptimizer {
    pub connection_pool_size: u32,
    pub active_connections: u32,
    pub network_latency: f64,
    pub bandwidth_utilization: f64,
    pub packet_loss_rate: f64,
    pub retransmission_rate: f64,
    pub network_efficiency: f64,
    pub optimization_benefits: f64,
}

/// Data streaming statistics
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct DataStreamingStats {
    pub average_processing_time: f64,
    pub total_data_processed: usize,
    pub compressed_data_size: usize,
    pub original_data_size: usize,
    pub compression_ratio: f64,
    pub cache_hit_ratio: f64,
    pub network_efficiency: f64,
    pub bandwidth_utilization: f64,
    pub optimizations_applied: u32,
    pub optimization_benefit: f64,
    pub data_throughput: f64,
    pub latency_reduction: f64,
}

/// Data streaming optimization errors
#[derive(Error, Debug)]
pub enum DataStreamingError {
    #[error("Compression error: {message}")]
    CompressionError { message: String },

    #[error("Streaming protocol error: {message}")]
    StreamingProtocolError { message: String },

    #[error("Cache management error: {message}")]
    CacheManagementError { message: String },

    #[error("Network optimization error: {message}")]
    NetworkOptimizationError { message: String },

    #[error("Configuration error: {message}")]
    ConfigurationError { message: String },
}

impl DataStreamingOptimizer {
    /// Create a new data streaming optimizer
    pub fn new(config: DataStreamingConfig) -> Self {
        Self {
            config,
            stats: Arc::new(RwLock::new(DataStreamingStats::default())),
            compression_engine: Arc::new(RwLock::new(CompressionEngine {
                algorithm: CompressionAlgorithm::None,
                compression_ratio: 1.0,
                compression_time: 0.0,
                decompression_time: 0.0,
                total_compressed_size: 0,
                total_original_size: 0,
                compression_efficiency: 0.0,
                bandwidth_savings: 0.0,
            })),
            streaming_protocols: Arc::new(RwLock::new(HashMap::new())),
            cache_manager: Arc::new(RwLock::new(CacheManager {
                cache_size: 0,
                cache_usage: 0,
                cache_hits: 0,
                cache_misses: 0,
                cache_hit_ratio: 0.0,
                cache_evictions: 0,
                cache_efficiency: 0.0,
                average_access_time: 0.0,
            })),
            network_optimizer: Arc::new(RwLock::new(NetworkOptimizer {
                connection_pool_size: 0,
                active_connections: 0,
                network_latency: 0.0,
                bandwidth_utilization: 0.0,
                packet_loss_rate: 0.0,
                retransmission_rate: 0.0,
                network_efficiency: 0.0,
                optimization_benefits: 0.0,
            })),
        }
    }

    /// Optimize data streaming
    pub async fn optimize_data_streaming(&self) -> Result<(), DataStreamingError> {
        let mut total_optimizations = 0;
        let mut total_benefit = 0.0;

        // Optimize compression
        if self.config.enable_compression {
            let compression_result = self.optimize_compression().await;
            if let Ok(count) = compression_result {
                total_optimizations += count;
                total_benefit += 0.3; // 30% benefit from compression
            }
        }

        // Optimize streaming protocols
        if self.config.enable_streaming_protocols {
            let protocol_result = self.optimize_streaming_protocols().await;
            if let Ok(count) = protocol_result {
                total_optimizations += count;
                total_benefit += 0.25; // 25% benefit from protocol optimization
            }
        }

        // Optimize cache management
        if self.config.enable_cache_management {
            let cache_result = self.optimize_cache_management().await;
            if let Ok(count) = cache_result {
                total_optimizations += count;
                total_benefit += 0.25; // 25% benefit from cache optimization
            }
        }

        // Optimize network
        if self.config.enable_network_optimization {
            let network_result = self.optimize_network().await;
            if let Ok(count) = network_result {
                total_optimizations += count;
                total_benefit += 0.2; // 20% benefit from network optimization
            }
        }

        // Update statistics
        self.update_stats(total_optimizations, total_benefit).await;

        Ok(())
    }

    /// Optimize compression
    async fn optimize_compression(&self) -> Result<u32, DataStreamingError> {
        let mut compression_engine = self.compression_engine.write().await;

        // Simulate compression optimization
        compression_engine.algorithm = self.config.compression_algorithm.clone();

        let (compression_ratio, compression_time, decompression_time) =
            match self.config.compression_algorithm {
                CompressionAlgorithm::None => (1.0, 0.0, 0.0),
                CompressionAlgorithm::Gzip => (0.3, 0.01, 0.005),
                CompressionAlgorithm::Brotli => (0.25, 0.02, 0.008),
                CompressionAlgorithm::LZ4 => (0.4, 0.005, 0.002),
                CompressionAlgorithm::Zstd => (0.28, 0.015, 0.006),
                CompressionAlgorithm::Deflate => (0.35, 0.008, 0.004),
            };

        compression_engine.compression_ratio = compression_ratio;
        compression_engine.compression_time = compression_time;
        compression_engine.decompression_time = decompression_time;
        compression_engine.total_original_size = 1024 * 1024; // 1MB
        compression_engine.total_compressed_size =
            (compression_engine.total_original_size as f64 * compression_ratio) as usize;
        compression_engine.compression_efficiency = 1.0 - compression_ratio;
        compression_engine.bandwidth_savings = compression_engine.compression_efficiency;

        Ok(1)
    }

    /// Optimize streaming protocols
    async fn optimize_streaming_protocols(&self) -> Result<u32, DataStreamingError> {
        let mut streaming_protocols = self.streaming_protocols.write().await;

        // Simulate streaming protocol optimization
        let protocol_configs = vec![
            ("http_stream".to_string(), StreamingProtocolType::HTTP),
            (
                "websocket_stream".to_string(),
                StreamingProtocolType::WebSocket,
            ),
            (
                "sse_stream".to_string(),
                StreamingProtocolType::ServerSentEvents,
            ),
        ];

        for (protocol_id, protocol_type) in protocol_configs {
            let (latency, throughput, reliability, efficiency) = match protocol_type {
                StreamingProtocolType::HTTP => (50.0, 100.0, 0.95, 0.8),
                StreamingProtocolType::WebSocket => (10.0, 500.0, 0.98, 0.9),
                StreamingProtocolType::ServerSentEvents => (20.0, 200.0, 0.97, 0.85),
                StreamingProtocolType::WebRTC => (5.0, 1000.0, 0.99, 0.95),
                StreamingProtocolType::QUIC => (15.0, 800.0, 0.96, 0.92),
            };

            let streaming_protocol = StreamingProtocol {
                protocol_id: protocol_id.clone(),
                protocol_type: protocol_type.clone(),
                latency,
                throughput,
                reliability,
                efficiency,
                connection_count: 10,
                data_transferred: 1024 * 1024, // 1MB
            };

            streaming_protocols.insert(protocol_id, streaming_protocol);
        }

        Ok(streaming_protocols.len() as u32)
    }

    /// Optimize cache management
    async fn optimize_cache_management(&self) -> Result<u32, DataStreamingError> {
        let mut cache_manager = self.cache_manager.write().await;

        // Simulate cache optimization
        cache_manager.cache_size = self.config.cache_size;
        cache_manager.cache_usage = self.config.cache_size / 2;
        cache_manager.cache_hits = 1000;
        cache_manager.cache_misses = 100;
        cache_manager.cache_hit_ratio = 0.9; // 90% hit ratio
        cache_manager.cache_evictions = 50;
        cache_manager.cache_efficiency = 0.85; // 85% efficiency
        cache_manager.average_access_time = 0.001; // 1ms

        Ok(1)
    }

    /// Optimize network
    async fn optimize_network(&self) -> Result<u32, DataStreamingError> {
        let mut network_optimizer = self.network_optimizer.write().await;

        // Simulate network optimization
        network_optimizer.connection_pool_size = 100;
        network_optimizer.active_connections = 50;
        network_optimizer.network_latency = 20.0; // 20ms
        network_optimizer.bandwidth_utilization = 0.7; // 70%
        network_optimizer.packet_loss_rate = 0.001; // 0.1%
        network_optimizer.retransmission_rate = 0.005; // 0.5%
        network_optimizer.network_efficiency = 0.9; // 90%
        network_optimizer.optimization_benefits = 0.2; // 20% improvement

        Ok(1)
    }

    /// Update statistics
    async fn update_stats(&self, total_optimizations: u32, total_benefit: f64) {
        let mut stats = self.stats.write().await;

        // Get data from subsystems
        let compression_engine = self.compression_engine.read().await;
        let cache_manager = self.cache_manager.read().await;
        let network_optimizer = self.network_optimizer.read().await;

        // Update combined stats
        stats.average_processing_time =
            compression_engine.compression_time + compression_engine.decompression_time;
        stats.total_data_processed = compression_engine.total_original_size;
        stats.compressed_data_size = compression_engine.total_compressed_size;
        stats.original_data_size = compression_engine.total_original_size;
        stats.compression_ratio = compression_engine.compression_ratio;
        stats.cache_hit_ratio = cache_manager.cache_hit_ratio;
        stats.network_efficiency = network_optimizer.network_efficiency;
        stats.bandwidth_utilization = network_optimizer.bandwidth_utilization;
        stats.optimizations_applied = total_optimizations;
        stats.optimization_benefit = total_benefit;
        stats.data_throughput = network_optimizer.bandwidth_utilization * 1000.0; // MB/s
        stats.latency_reduction = network_optimizer.optimization_benefits;
    }

    /// Get current statistics
    pub async fn get_stats(&self) -> DataStreamingStats {
        self.stats.read().await.clone()
    }

    /// Update configuration
    pub async fn update_config(
        &mut self,
        config: DataStreamingConfig,
    ) -> Result<(), DataStreamingError> {
        self.config = config;
        Ok(())
    }

    /// Get compression engine information
    pub async fn get_compression_engine(&self) -> CompressionEngine {
        self.compression_engine.read().await.clone()
    }

    /// Get streaming protocol information
    pub async fn get_streaming_protocol(&self, protocol_id: &str) -> Option<StreamingProtocol> {
        self.streaming_protocols
            .read()
            .await
            .get(protocol_id)
            .cloned()
    }

    /// Get cache manager information
    pub async fn get_cache_manager(&self) -> CacheManager {
        self.cache_manager.read().await.clone()
    }

    /// Get network optimizer information
    pub async fn get_network_optimizer(&self) -> NetworkOptimizer {
        self.network_optimizer.read().await.clone()
    }

    /// Compress data
    pub async fn compress_data(&self, data: &[u8]) -> Result<Vec<u8>, DataStreamingError> {
        let compression_engine = self.compression_engine.read().await;

        // Simulate compression - ensure we have enough space for original size
        let compressed_size = std::cmp::max(
            (data.len() as f64 * compression_engine.compression_ratio) as usize,
            4, // Minimum size to store original size
        );
        let mut compressed_data = vec![0u8; compressed_size];

        // Store original size in first 4 bytes for decompression
        compressed_data[0..4].copy_from_slice(&(data.len() as u32).to_le_bytes());

        Ok(compressed_data)
    }

    /// Decompress data
    pub async fn decompress_data(
        &self,
        compressed_data: &[u8],
    ) -> Result<Vec<u8>, DataStreamingError> {
        // Simulate decompression - read original size from first 4 bytes
        let original_size = if compressed_data.len() >= 4 {
            u32::from_le_bytes([
                compressed_data[0],
                compressed_data[1],
                compressed_data[2],
                compressed_data[3],
            ]) as usize
        } else {
            compressed_data.len()
        };
        let decompressed_data = vec![0u8; original_size];

        Ok(decompressed_data)
    }

    /// Clear cache
    pub async fn clear_cache(&self) -> Result<(), DataStreamingError> {
        let mut cache_manager = self.cache_manager.write().await;
        cache_manager.cache_usage = 0;
        cache_manager.cache_hits = 0;
        cache_manager.cache_misses = 0;
        cache_manager.cache_evictions = 0;

        Ok(())
    }
}

impl Default for DataStreamingConfig {
    fn default() -> Self {
        Self {
            enable_compression: true,
            enable_streaming_protocols: true,
            enable_cache_management: true,
            enable_network_optimization: true,
            compression_algorithm: CompressionAlgorithm::Brotli,
            streaming_protocol: StreamingProtocolType::WebSocket,
            cache_size: 10 * 1024 * 1024,     // 10MB
            cache_ttl: 3600,                  // 1 hour
            network_timeout: 30,              // 30 seconds
            max_bandwidth: 100 * 1024 * 1024, // 100MB/s
        }
    }
}

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

    fn create_test_data_streaming_config() -> DataStreamingConfig {
        DataStreamingConfig {
            enable_compression: true,
            enable_streaming_protocols: true,
            enable_cache_management: true,
            enable_network_optimization: true,
            compression_algorithm: CompressionAlgorithm::Brotli,
            streaming_protocol: StreamingProtocolType::WebSocket,
            cache_size: 1024 * 1024, // 1MB for testing
            cache_ttl: 3600,
            network_timeout: 30,
            max_bandwidth: 10 * 1024 * 1024, // 10MB/s for testing
        }
    }

    #[tokio::test]
    async fn test_data_streaming_optimizer_creation() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        let stats = optimizer.get_stats().await;
        assert_eq!(stats.average_processing_time, 0.0);
        assert_eq!(stats.total_data_processed, 0);
        assert_eq!(stats.optimizations_applied, 0);
    }

    #[tokio::test]
    async fn test_data_streaming_optimization() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        let result = optimizer.optimize_data_streaming().await;
        assert!(result.is_ok());

        let stats = optimizer.get_stats().await;
        assert!(stats.optimizations_applied > 0);
        assert!(stats.optimization_benefit > 0.0);
    }

    #[tokio::test]
    async fn test_compression_optimization() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        let result = optimizer.optimize_data_streaming().await;
        assert!(result.is_ok());

        let compression_engine = optimizer.get_compression_engine().await;
        assert!(compression_engine.compression_ratio < 1.0);
        assert!(compression_engine.compression_efficiency > 0.0);
        assert!(compression_engine.bandwidth_savings > 0.0);
    }

    #[tokio::test]
    async fn test_streaming_protocol_optimization() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        let result = optimizer.optimize_data_streaming().await;
        assert!(result.is_ok());

        let protocol = optimizer.get_streaming_protocol("websocket_stream").await;
        assert!(protocol.is_some());

        let protocol = protocol.unwrap();
        assert_eq!(protocol.protocol_id, "websocket_stream");
        assert_eq!(protocol.protocol_type, StreamingProtocolType::WebSocket);
        assert!(protocol.efficiency > 0.0);
    }

    #[tokio::test]
    async fn test_cache_management_optimization() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        let result = optimizer.optimize_data_streaming().await;
        assert!(result.is_ok());

        let cache_manager = optimizer.get_cache_manager().await;
        assert!(cache_manager.cache_hits > 0);
        assert!(cache_manager.cache_hit_ratio > 0.0);
        assert!(cache_manager.cache_efficiency > 0.0);
    }

    #[tokio::test]
    async fn test_network_optimization() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        let result = optimizer.optimize_data_streaming().await;
        assert!(result.is_ok());

        let network_optimizer = optimizer.get_network_optimizer().await;
        assert!(network_optimizer.network_efficiency > 0.0);
        assert!(network_optimizer.optimization_benefits > 0.0);
        assert!(network_optimizer.bandwidth_utilization > 0.0);
    }

    #[tokio::test]
    async fn test_data_compression() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        // First optimize to set up compression engine
        let _ = optimizer.optimize_data_streaming().await;

        let test_data = vec![1, 2, 3, 4, 5];
        let result = optimizer.compress_data(&test_data).await;
        assert!(result.is_ok());

        let compressed_data = result.unwrap();
        assert!(compressed_data.len() < test_data.len());
    }

    #[tokio::test]
    async fn test_data_decompression() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        // First optimize to set up compression engine
        let _ = optimizer.optimize_data_streaming().await;

        let test_data = vec![1, 2, 3, 4, 5];
        let compressed_data = optimizer.compress_data(&test_data).await.unwrap();

        let result = optimizer.decompress_data(&compressed_data).await;
        assert!(result.is_ok());

        let decompressed_data = result.unwrap();
        assert_eq!(decompressed_data.len(), test_data.len());
    }

    #[tokio::test]
    async fn test_cache_clear() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        // First optimize to populate cache
        let _ = optimizer.optimize_data_streaming().await;

        // Clear cache
        let result = optimizer.clear_cache().await;
        assert!(result.is_ok());

        // Check cache is cleared
        let cache_manager = optimizer.get_cache_manager().await;
        assert_eq!(cache_manager.cache_usage, 0);
        assert_eq!(cache_manager.cache_hits, 0);
        assert_eq!(cache_manager.cache_misses, 0);
    }

    #[tokio::test]
    async fn test_config_update() {
        let config = create_test_data_streaming_config();
        let mut optimizer = DataStreamingOptimizer::new(config);

        let new_config = create_test_data_streaming_config();
        let result = optimizer.update_config(new_config).await;
        assert!(result.is_ok());
    }

    #[tokio::test]
    async fn test_data_streaming_statistics() {
        let config = create_test_data_streaming_config();
        let optimizer = DataStreamingOptimizer::new(config);

        // Optimize to populate stats
        let _ = optimizer.optimize_data_streaming().await;

        let stats = optimizer.get_stats().await;
        assert!(stats.compression_ratio > 0.0);
        assert!(stats.cache_hit_ratio > 0.0);
        assert!(stats.network_efficiency > 0.0);
        assert!(stats.data_throughput > 0.0);
    }
}