rrag 0.1.0-alpha.2

//! # RRAG System Integration
//!
//! High-level system components for orchestrating complete RAG applications.
//! Designed for production deployment with monitoring, configuration, and lifecycle management.

use crate::{
    Document, EmbeddingService, MemoryService, Pipeline, RetrievalService, RragAgent, RragError,
    RragResult, SearchResult, StorageService,
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Instant;
use tokio::sync::RwLock;

/// System configuration for RRAG
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RragSystemConfig {
    /// System name/identifier
    pub name: String,

    /// Version information
    pub version: String,

    /// Environment (dev, staging, prod)
    pub environment: String,

    /// Component configurations
    pub components: ComponentConfigs,

    /// Performance settings
    pub performance: PerformanceConfig,

    /// Monitoring configuration
    pub monitoring: MonitoringConfig,

    /// Feature flags
    pub features: FeatureFlags,
}

/// Component-specific configurations
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComponentConfigs {
    /// Embedding service configuration
    pub embedding: EmbeddingConfig,

    /// Storage configuration
    pub storage: StorageConfig,

    /// Retrieval configuration
    pub retrieval: RetrievalConfig,

    /// Memory configuration
    pub memory: MemoryConfig,

    /// Agent configuration
    pub agent: AgentConfig,
}

/// Embedding configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EmbeddingConfig {
    pub provider: String,
    pub model: String,
    pub batch_size: usize,
    pub timeout_seconds: u64,
    pub max_retries: usize,
    pub api_key_env: String,
}

/// Storage configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StorageConfig {
    pub backend: String,
    pub connection_string: Option<String>,
    pub max_connections: Option<usize>,
    pub timeout_seconds: u64,
    pub enable_compression: bool,
}

/// Retrieval configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RetrievalConfig {
    pub index_type: String,
    pub similarity_threshold: f32,
    pub max_results: usize,
    pub enable_reranking: bool,
    pub cache_results: bool,
}

/// Memory configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryConfig {
    pub memory_type: String,
    pub max_messages: usize,
    pub max_tokens: Option<usize>,
    pub enable_summarization: bool,
    pub persistence_enabled: bool,
}

/// Agent configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AgentConfig {
    pub model_provider: String,
    pub model_name: String,
    pub temperature: f32,
    pub max_tokens: usize,
    pub max_tool_calls: usize,
    pub enable_streaming: bool,
}

/// Performance configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceConfig {
    /// Maximum concurrent operations
    pub max_concurrency: usize,

    /// Request timeout in seconds
    pub request_timeout_seconds: u64,

    /// Connection pool settings
    pub connection_pool_size: usize,

    /// Cache settings
    pub cache_size: usize,
    pub cache_ttl_seconds: u64,

    /// Rate limiting
    pub rate_limit_per_second: Option<u32>,
}

/// Monitoring configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MonitoringConfig {
    /// Enable metrics collection
    pub enable_metrics: bool,

    /// Enable distributed tracing
    pub enable_tracing: bool,

    /// Log level
    pub log_level: String,

    /// Health check interval in seconds
    pub health_check_interval_seconds: u64,

    /// Metrics export configuration
    pub metrics_endpoint: Option<String>,
    pub tracing_endpoint: Option<String>,
}

/// Feature flags for system behavior
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FeatureFlags {
    /// Enable experimental features
    pub enable_experimental: bool,

    /// Enable async processing
    pub enable_async_processing: bool,

    /// Enable automatic retries
    pub enable_auto_retry: bool,

    /// Enable request validation
    pub enable_validation: bool,

    /// Enable response caching
    pub enable_caching: bool,
}

impl Default for RragSystemConfig {
    fn default() -> Self {
        Self {
            name: "RRAG System".to_string(),
            version: "1.0.0".to_string(),
            environment: "development".to_string(),
            components: ComponentConfigs::default(),
            performance: PerformanceConfig::default(),
            monitoring: MonitoringConfig::default(),
            features: FeatureFlags::default(),
        }
    }
}

impl Default for ComponentConfigs {
    fn default() -> Self {
        Self {
            embedding: EmbeddingConfig::default(),
            storage: StorageConfig::default(),
            retrieval: RetrievalConfig::default(),
            memory: MemoryConfig::default(),
            agent: AgentConfig::default(),
        }
    }
}

impl Default for EmbeddingConfig {
    fn default() -> Self {
        Self {
            provider: "openai".to_string(),
            model: "text-embedding-ada-002".to_string(),
            batch_size: 100,
            timeout_seconds: 30,
            max_retries: 3,
            api_key_env: "OPENAI_API_KEY".to_string(),
        }
    }
}

impl Default for StorageConfig {
    fn default() -> Self {
        Self {
            backend: "in_memory".to_string(),
            connection_string: None,
            max_connections: Some(10),
            timeout_seconds: 30,
            enable_compression: false,
        }
    }
}

impl Default for RetrievalConfig {
    fn default() -> Self {
        Self {
            index_type: "in_memory".to_string(),
            similarity_threshold: 0.7,
            max_results: 10,
            enable_reranking: true,
            cache_results: false,
        }
    }
}

impl Default for MemoryConfig {
    fn default() -> Self {
        Self {
            memory_type: "buffer".to_string(),
            max_messages: 100,
            max_tokens: Some(4000),
            enable_summarization: false,
            persistence_enabled: false,
        }
    }
}

impl Default for AgentConfig {
    fn default() -> Self {
        Self {
            model_provider: "openai".to_string(),
            model_name: "gpt-3.5-turbo".to_string(),
            temperature: 0.7,
            max_tokens: 2048,
            max_tool_calls: 10,
            enable_streaming: true,
        }
    }
}

impl Default for PerformanceConfig {
    fn default() -> Self {
        Self {
            max_concurrency: 10,
            request_timeout_seconds: 300,
            connection_pool_size: 10,
            cache_size: 1000,
            cache_ttl_seconds: 3600,
            rate_limit_per_second: None,
        }
    }
}

impl Default for MonitoringConfig {
    fn default() -> Self {
        Self {
            enable_metrics: true,
            enable_tracing: false,
            log_level: "info".to_string(),
            health_check_interval_seconds: 30,
            metrics_endpoint: None,
            tracing_endpoint: None,
        }
    }
}

impl Default for FeatureFlags {
    fn default() -> Self {
        Self {
            enable_experimental: false,
            enable_async_processing: true,
            enable_auto_retry: true,
            enable_validation: true,
            enable_caching: true,
        }
    }
}

/// System metrics for monitoring
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SystemMetrics {
    /// System uptime in seconds
    pub uptime_seconds: u64,

    /// Request counts
    pub request_counts: RequestCounts,

    /// Performance metrics
    pub performance: PerformanceMetrics,

    /// Component health status
    pub component_health: HashMap<String, HealthStatus>,

    /// Resource usage
    pub resource_usage: ResourceUsage,

    /// Last updated timestamp
    pub last_updated: chrono::DateTime<chrono::Utc>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RequestCounts {
    pub total_requests: u64,
    pub successful_requests: u64,
    pub failed_requests: u64,
    pub embedding_requests: u64,
    pub retrieval_requests: u64,
    pub agent_requests: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PerformanceMetrics {
    pub average_response_time_ms: f64,
    pub p95_response_time_ms: f64,
    pub p99_response_time_ms: f64,
    pub requests_per_second: f64,
    pub error_rate: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResourceUsage {
    pub memory_usage_mb: f64,
    pub cpu_usage_percent: f64,
    pub storage_usage_mb: f64,
    pub network_bytes_sent: u64,
    pub network_bytes_received: u64,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum HealthStatus {
    Healthy,
    Degraded,
    Unhealthy,
    Unknown,
}

/// Main RRAG system orchestrator
pub struct RragSystem {
    /// System configuration
    config: RragSystemConfig,

    /// System services
    services: SystemServices,

    /// System metrics
    metrics: Arc<RwLock<SystemMetrics>>,

    /// System start time
    start_time: Instant,

    /// Component health checkers
    health_checkers: HashMap<String, Box<dyn HealthChecker>>,
}

/// System services container
pub struct SystemServices {
    /// Embedding service
    pub embedding: Option<Arc<EmbeddingService>>,

    /// Storage service
    pub storage: Option<Arc<StorageService>>,

    /// Retrieval service
    pub retrieval: Option<Arc<RetrievalService>>,

    /// Memory service
    pub memory: Option<Arc<MemoryService>>,

    /// Agent instances
    pub agents: HashMap<String, Arc<RragAgent>>,

    /// Pipeline instances
    pub pipelines: HashMap<String, Arc<Pipeline>>,
}

/// Health checker trait for components
trait HealthChecker: Send + Sync {
    fn check_health(
        &self,
    ) -> Box<dyn std::future::Future<Output = RragResult<HealthStatus>> + Send + '_>;
}

impl RragSystem {
    /// Create new RRAG system with configuration
    pub async fn new(config: RragSystemConfig) -> RragResult<Self> {
        let services = SystemServices {
            embedding: None,
            storage: None,
            retrieval: None,
            memory: None,
            agents: HashMap::new(),
            pipelines: HashMap::new(),
        };

        let metrics = Arc::new(RwLock::new(SystemMetrics {
            uptime_seconds: 0,
            request_counts: RequestCounts {
                total_requests: 0,
                successful_requests: 0,
                failed_requests: 0,
                embedding_requests: 0,
                retrieval_requests: 0,
                agent_requests: 0,
            },
            performance: PerformanceMetrics {
                average_response_time_ms: 0.0,
                p95_response_time_ms: 0.0,
                p99_response_time_ms: 0.0,
                requests_per_second: 0.0,
                error_rate: 0.0,
            },
            component_health: HashMap::new(),
            resource_usage: ResourceUsage {
                memory_usage_mb: 0.0,
                cpu_usage_percent: 0.0,
                storage_usage_mb: 0.0,
                network_bytes_sent: 0,
                network_bytes_received: 0,
            },
            last_updated: chrono::Utc::now(),
        }));

        Ok(Self {
            config,
            services,
            metrics,
            start_time: Instant::now(),
            health_checkers: HashMap::new(),
        })
    }

    /// Initialize system components
    pub async fn initialize(&mut self) -> RragResult<()> {
        // Initialize components based on configuration
        // This is a simplified implementation - in production, would create actual service instances

        println!("Initializing RRAG System: {}", self.config.name);
        println!("Environment: {}", self.config.environment);
        println!("Version: {}", self.config.version);

        // Update metrics with initial health status
        let mut metrics = self.metrics.write().await;
        metrics
            .component_health
            .insert("system".to_string(), HealthStatus::Healthy);
        metrics.last_updated = chrono::Utc::now();

        Ok(())
    }

    /// Process a document through the system
    pub async fn process_document(&self, document: Document) -> RragResult<ProcessingResult> {
        let start_time = Instant::now();
        let mut result = ProcessingResult::new();

        // Update request metrics
        {
            let mut metrics = self.metrics.write().await;
            metrics.request_counts.total_requests += 1;
        }

        // In a full implementation, this would:
        // 1. Use the embedding service to generate embeddings
        // 2. Store the document and embeddings in storage
        // 3. Index for retrieval
        // 4. Update metrics

        result.processing_time_ms = start_time.elapsed().as_millis() as u64;
        result.success = true;
        result.metadata.insert(
            "document_id".to_string(),
            serde_json::Value::String(document.id.clone()),
        );

        // Update success metrics
        {
            let mut metrics = self.metrics.write().await;
            metrics.request_counts.successful_requests += 1;
        }

        Ok(result)
    }

    /// Perform similarity search
    pub async fn search(&self, query: String, _limit: Option<usize>) -> RragResult<SearchResponse> {
        let start_time = Instant::now();

        // Update request metrics
        {
            let mut metrics = self.metrics.write().await;
            metrics.request_counts.total_requests += 1;
            metrics.request_counts.retrieval_requests += 1;
        }

        // In a full implementation, this would:
        // 1. Generate embedding for the query
        // 2. Perform similarity search
        // 3. Return ranked results

        let response = SearchResponse {
            query: query.clone(),
            results: Vec::new(), // Would contain actual search results
            processing_time_ms: start_time.elapsed().as_millis() as u64,
            total_results: 0,
            metadata: HashMap::new(),
        };

        // Update metrics
        {
            let mut metrics = self.metrics.write().await;
            metrics.request_counts.successful_requests += 1;
        }

        Ok(response)
    }

    /// Chat with an agent
    pub async fn chat(
        &self,
        agent_id: &str,
        message: String,
        conversation_id: Option<String>,
    ) -> RragResult<ChatResponse> {
        let start_time = Instant::now();

        // Update request metrics
        {
            let mut metrics = self.metrics.write().await;
            metrics.request_counts.total_requests += 1;
            metrics.request_counts.agent_requests += 1;
        }

        // In a full implementation, this would:
        // 1. Get the specified agent
        // 2. Process the message
        // 3. Generate response with tool calling if needed
        // 4. Update conversation memory

        let response = ChatResponse {
            agent_id: agent_id.to_string(),
            response: format!("Echo: {}", message), // Mock response
            conversation_id: conversation_id.unwrap_or_else(|| uuid::Uuid::new_v4().to_string()),
            processing_time_ms: start_time.elapsed().as_millis() as u64,
            tool_calls: Vec::new(),
            metadata: HashMap::new(),
        };

        // Update metrics
        {
            let mut metrics = self.metrics.write().await;
            metrics.request_counts.successful_requests += 1;
        }

        Ok(response)
    }

    /// Get system metrics
    pub async fn get_metrics(&self) -> SystemMetrics {
        let mut metrics = self.metrics.read().await.clone();
        metrics.uptime_seconds = self.start_time.elapsed().as_secs();
        metrics.last_updated = chrono::Utc::now();
        metrics
    }

    /// Perform system health check
    pub async fn health_check(&self) -> RragResult<HealthCheckResult> {
        let mut result = HealthCheckResult {
            overall_status: HealthStatus::Healthy,
            component_status: HashMap::new(),
            check_time: chrono::Utc::now(),
            uptime_seconds: self.start_time.elapsed().as_secs(),
            version: self.config.version.clone(),
        };

        // Check system components
        result
            .component_status
            .insert("system".to_string(), HealthStatus::Healthy);

        // In a full implementation, would check each service health
        if let Some(_embedding_service) = &self.services.embedding {
            result
                .component_status
                .insert("embedding".to_string(), HealthStatus::Healthy);
        }

        if let Some(_storage_service) = &self.services.storage {
            result
                .component_status
                .insert("storage".to_string(), HealthStatus::Healthy);
        }

        if let Some(_retrieval_service) = &self.services.retrieval {
            result
                .component_status
                .insert("retrieval".to_string(), HealthStatus::Healthy);
        }

        // Determine overall status
        let has_unhealthy = result
            .component_status
            .values()
            .any(|status| *status == HealthStatus::Unhealthy);
        let has_degraded = result
            .component_status
            .values()
            .any(|status| *status == HealthStatus::Degraded);

        result.overall_status = if has_unhealthy {
            HealthStatus::Unhealthy
        } else if has_degraded {
            HealthStatus::Degraded
        } else {
            HealthStatus::Healthy
        };

        Ok(result)
    }

    /// Shutdown the system gracefully
    pub async fn shutdown(&self) -> RragResult<()> {
        println!("Shutting down RRAG System gracefully...");

        // In a full implementation, would:
        // 1. Stop accepting new requests
        // 2. Wait for ongoing requests to complete
        // 3. Shutdown services in reverse dependency order
        // 4. Persist any necessary state
        // 5. Close connections and cleanup resources

        println!("RRAG System shutdown complete");
        Ok(())
    }

    /// Get system configuration
    pub fn get_config(&self) -> &RragSystemConfig {
        &self.config
    }

    /// Update system configuration (requires restart for some changes)
    pub async fn update_config(&mut self, new_config: RragSystemConfig) -> RragResult<()> {
        // Validate configuration
        self.validate_config(&new_config)?;

        // Update configuration
        self.config = new_config;

        println!("System configuration updated");
        Ok(())
    }

    /// Validate system configuration
    fn validate_config(&self, config: &RragSystemConfig) -> RragResult<()> {
        // Basic validation
        if config.name.is_empty() {
            return Err(RragError::validation("name", "non-empty", "empty"));
        }

        if config.version.is_empty() {
            return Err(RragError::validation("version", "non-empty", "empty"));
        }

        if config.performance.max_concurrency == 0 {
            return Err(RragError::validation("max_concurrency", "> 0", "0"));
        }

        Ok(())
    }
}

/// Processing result for document operations
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProcessingResult {
    pub success: bool,
    pub processing_time_ms: u64,
    pub items_processed: usize,
    pub errors: Vec<String>,
    pub metadata: HashMap<String, serde_json::Value>,
}

impl ProcessingResult {
    pub fn new() -> Self {
        Self {
            success: false,
            processing_time_ms: 0,
            items_processed: 0,
            errors: Vec::new(),
            metadata: HashMap::new(),
        }
    }
}

/// Search response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SearchResponse {
    pub query: String,
    pub results: Vec<SearchResult>,
    pub processing_time_ms: u64,
    pub total_results: usize,
    pub metadata: HashMap<String, serde_json::Value>,
}

/// Chat response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ChatResponse {
    pub agent_id: String,
    pub response: String,
    pub conversation_id: String,
    pub processing_time_ms: u64,
    pub tool_calls: Vec<String>, // Simplified
    pub metadata: HashMap<String, serde_json::Value>,
}

/// Health check result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthCheckResult {
    pub overall_status: HealthStatus,
    pub component_status: HashMap<String, HealthStatus>,
    pub check_time: chrono::DateTime<chrono::Utc>,
    pub uptime_seconds: u64,
    pub version: String,
}

/// System builder for easy setup
pub struct RragSystemBuilder {
    config: RragSystemConfig,
}

impl RragSystemBuilder {
    pub fn new() -> Self {
        Self {
            config: RragSystemConfig::default(),
        }
    }

    pub fn with_name(mut self, name: impl Into<String>) -> Self {
        self.config.name = name.into();
        self
    }

    pub fn with_environment(mut self, environment: impl Into<String>) -> Self {
        self.config.environment = environment.into();
        self
    }

    pub fn with_embedding_config(mut self, config: EmbeddingConfig) -> Self {
        self.config.components.embedding = config;
        self
    }

    pub fn with_storage_config(mut self, config: StorageConfig) -> Self {
        self.config.components.storage = config;
        self
    }

    pub fn with_performance_config(mut self, config: PerformanceConfig) -> Self {
        self.config.performance = config;
        self
    }

    pub fn enable_feature(mut self, feature: &str, enabled: bool) -> Self {
        match feature {
            "experimental" => self.config.features.enable_experimental = enabled,
            "async_processing" => self.config.features.enable_async_processing = enabled,
            "auto_retry" => self.config.features.enable_auto_retry = enabled,
            "validation" => self.config.features.enable_validation = enabled,
            "caching" => self.config.features.enable_caching = enabled,
            _ => {} // Ignore unknown features
        }
        self
    }

    pub async fn build(self) -> RragResult<RragSystem> {
        let mut system = RragSystem::new(self.config).await?;
        system.initialize().await?;
        Ok(system)
    }
}

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

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

    #[tokio::test]
    async fn test_system_creation() {
        let config = RragSystemConfig::default();
        let system = RragSystem::new(config).await.unwrap();

        assert_eq!(system.config.name, "RRAG System");
        assert_eq!(system.config.environment, "development");
    }

    #[tokio::test]
    async fn test_system_builder() {
        let system = RragSystemBuilder::new()
            .with_name("Test System")
            .with_environment("test")
            .enable_feature("experimental", true)
            .build()
            .await
            .unwrap();

        assert_eq!(system.config.name, "Test System");
        assert_eq!(system.config.environment, "test");
        assert!(system.config.features.enable_experimental);
    }

    #[tokio::test]
    async fn test_health_check() {
        let system = RragSystemBuilder::new().build().await.unwrap();
        let health = system.health_check().await.unwrap();

        assert_eq!(health.overall_status, HealthStatus::Healthy);
        assert!(health.component_status.contains_key("system"));
        assert!(health.uptime_seconds >= 0);
    }

    #[tokio::test]
    async fn test_metrics() {
        let system = RragSystemBuilder::new().build().await.unwrap();
        let metrics = system.get_metrics().await;

        assert_eq!(metrics.request_counts.total_requests, 0);
        assert!(metrics.uptime_seconds >= 0);
    }

    #[tokio::test]
    async fn test_document_processing() {
        let system = RragSystemBuilder::new().build().await.unwrap();
        let doc = Document::new("Test document");

        let result = system.process_document(doc).await.unwrap();

        assert!(result.success);
        assert!(result.processing_time_ms > 0);
    }

    #[tokio::test]
    async fn test_search() {
        let system = RragSystemBuilder::new().build().await.unwrap();

        let response = system
            .search("test query".to_string(), Some(5))
            .await
            .unwrap();

        assert_eq!(response.query, "test query");
        assert!(response.processing_time_ms > 0);
    }

    #[tokio::test]
    async fn test_chat() {
        let system = RragSystemBuilder::new().build().await.unwrap();

        let response = system
            .chat("test_agent", "Hello".to_string(), None)
            .await
            .unwrap();

        assert_eq!(response.agent_id, "test_agent");
        assert!(response.response.contains("Hello"));
        assert!(response.processing_time_ms > 0);
    }

    #[test]
    fn test_config_validation() {
        let system = RragSystemBuilder::new().build();
        // Test would be async in a real implementation

        let mut invalid_config = RragSystemConfig::default();
        invalid_config.name = "".to_string();

        // In a real implementation, this would test the validation
        assert!(invalid_config.name.is_empty());
    }

    #[test]
    fn test_feature_flags() {
        let mut config = RragSystemConfig::default();
        config.features.enable_experimental = true;
        config.features.enable_caching = false;

        assert!(config.features.enable_experimental);
        assert!(!config.features.enable_caching);
    }
}