//! TLI gRPC client modules
//!
//! This module contains comprehensive gRPC client implementations for all
//! core trading system services with advanced features including:
//! - Connection pooling and health monitoring
//! - Real-time streaming support
//! - Automatic reconnection and circuit breakers
//! - Comprehensive error handling
//! - Metrics collection and alerting

pub mod backtesting_client;
pub mod connection_manager;
pub mod data_stream;
pub mod event_stream;
pub mod ml_training_client;
pub mod trading_client;

// NO RE-EXPORTS: Import directly from submodules
// Use tli::client::connection_manager::{ConnectionManager, ConnectionConfig, etc.} instead
// Use tli::client::trading_client::{TradingClient, TradingClientConfig} instead
// Use tli::client::backtesting_client::{BacktestingClient, BacktestingClientConfig} instead
// Use tli::client::ml_training_client::{MLTrainingClient, MLTrainingClientConfig, etc.} instead
// Use tli::client::event_stream::{EventStreamManager, EventStreamConfig} instead
// Use tli::client::stream_manager::{DataStreamManager} instead
// Use tli::client::data_stream::{DataStreamManager, DataStreamConfig} instead

/// Service endpoints configuration
#[derive(Debug, Clone, Default, serde::Serialize, serde::Deserialize)]
pub struct ServiceEndpoints {
    /// Trading engine endpoint
    pub trading_engine: String,
    /// Market data endpoint
    pub market_data: String,
    /// Backtesting service endpoint
    pub backtesting_service: String,
    /// ML training service endpoint
    pub ml_training_service: String,
}

impl ServiceEndpoints {
    /// Create default endpoints for local development
    ///
    /// # Security
    ///
    /// All endpoints use HTTPS (not HTTP) to enforce encrypted connections.
    ///
    /// # Wave 71 Update
    ///
    /// All endpoints now point to API Gateway (port 50050) instead of direct services.
    ///
    /// The API Gateway handles routing to backend services based on gRPC service names.
    pub fn localhost() -> Self {
        Self {
            trading_engine: "https://localhost:50050".to_owned(),       // API Gateway
            market_data: "https://localhost:50050".to_owned(),          // API Gateway
            backtesting_service: "https://localhost:50050".to_owned(),  // API Gateway
            ml_training_service: "https://localhost:50050".to_owned(),  // API Gateway
        }
    }
}

/// Client factory for creating and managing all service clients
#[derive(Debug)]
pub struct ClientFactory {
    /// Connection manager shared across all clients
    connection_manager: std::sync::Arc<connection_manager::ConnectionManager>,
    /// Global connection configuration
    #[allow(dead_code)]
    connection_config: connection_manager::ConnectionConfig,
}

impl ClientFactory {
    /// Create a new client factory
    pub fn new(connection_config: connection_manager::ConnectionConfig) -> Self {
        let connection_manager = std::sync::Arc::new(connection_manager::ConnectionManager::new(
            connection_config.clone(),
        ));

        Self {
            connection_manager,
            connection_config,
        }
    }

    /// Create a trading client
    pub const fn create_trading_client(
        &self,
        config: trading_client::TradingClientConfig,
    ) -> trading_client::TradingClient {
        trading_client::TradingClient::new(config)
    }

    /// Create a backtesting client
    pub const fn create_backtesting_client(
        &self,
        config: backtesting_client::BacktestingClientConfig,
    ) -> backtesting_client::BacktestingClient {
        backtesting_client::BacktestingClient::new(config)
    }

    /// Create an ML training client
    pub const fn create_ml_training_client(
        &self,
        config: ml_training_client::MLTrainingClientConfig,
    ) -> ml_training_client::MLTrainingClient {
        ml_training_client::MLTrainingClient::new(config)
    }

    /// Add a service connection to the pool
    pub async fn add_service(
        &self,
        service_name: String,
        config: connection_manager::ConnectionConfig,
    ) -> crate::error::TliResult<()> {
        self.connection_manager
            .add_service(service_name, config)
            .await
            .map_err(crate::error::TliError::Connection)
    }

    /// Get connection statistics for all services
    pub async fn get_connection_stats(
        &self,
    ) -> std::collections::HashMap<String, Vec<connection_manager::ConnectionStats>> {
        self.connection_manager.get_pool_stats().await
    }

    /// Shutdown all connections and clients
    pub async fn shutdown(&self) {
        self.connection_manager.shutdown().await;
    }
}

/// Convenience builder for creating a complete TLI client setup
#[derive(Debug)]
pub struct TliClientBuilder {
    /// Connection configuration
    connection_config: connection_manager::ConnectionConfig,
    /// Service endpoints
    service_endpoints: std::collections::HashMap<String, String>,
    /// Client configurations
    trading_config: Option<trading_client::TradingClientConfig>,
    backtesting_config: Option<backtesting_client::BacktestingClientConfig>,
    ml_training_config: Option<ml_training_client::MLTrainingClientConfig>,
}

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

impl TliClientBuilder {
    /// Create a new builder
    pub fn new() -> Self {
        Self {
            connection_config: connection_manager::ConnectionConfig::default(),
            service_endpoints: std::collections::HashMap::new(),
            trading_config: None,
            backtesting_config: None,
            ml_training_config: None,
        }
    }

    /// Set connection configuration
    pub fn with_connection_config(mut self, config: connection_manager::ConnectionConfig) -> Self {
        self.connection_config = config;
        self
    }

    /// Add a service endpoint
    pub fn with_service_endpoint(mut self, service_name: String, endpoint: String) -> Self {
        self.service_endpoints.insert(service_name, endpoint);
        self
    }

    /// Set trading client configuration
    pub fn with_trading_config(mut self, config: trading_client::TradingClientConfig) -> Self {
        self.trading_config = Some(config);
        self
    }

    /// Set backtesting client configuration
    pub fn with_backtesting_config(
        mut self,
        config: backtesting_client::BacktestingClientConfig,
    ) -> Self {
        self.backtesting_config = Some(config);
        self
    }

    /// Set ML training client configuration
    pub fn with_ml_training_config(
        mut self,
        config: ml_training_client::MLTrainingClientConfig,
    ) -> Self {
        self.ml_training_config = Some(config);
        self
    }

    /// Build the complete TLI client setup
    pub async fn build(self) -> crate::error::TliResult<TliClientSuite> {
        let factory = ClientFactory::new(self.connection_config.clone());

        // Add service connections
        for (service_name, endpoint) in self.service_endpoints {
            let mut service_config = self.connection_config.clone();
            service_config.server_url = endpoint;
            factory.add_service(service_name, service_config).await?;
        }

        // Create clients
        let trading_client = self.trading_config.map(|config| factory.create_trading_client(config));

        let backtesting_client = self.backtesting_config.map(|config| factory.create_backtesting_client(config));

        let ml_training_client = self.ml_training_config.map(|config| factory.create_ml_training_client(config));

        Ok(TliClientSuite {
            factory,
            trading_client,
            backtesting_client,
            ml_training_client,
        })
    }
}

/// Complete TLI client suite with all service clients
#[derive(Debug)]
pub struct TliClientSuite {
    /// Client factory
    pub factory: ClientFactory,
    /// Trading client (includes all operations: trading, risk, monitoring, config, system status)
    pub trading_client: Option<trading_client::TradingClient>,
    /// Backtesting client
    pub backtesting_client: Option<backtesting_client::BacktestingClient>,
    /// ML training client
    pub ml_training_client: Option<ml_training_client::MLTrainingClient>,
}

impl TliClientSuite {
    /// Get connection statistics for all services
    pub async fn get_connection_stats(
        &self,
    ) -> std::collections::HashMap<String, Vec<connection_manager::ConnectionStats>> {
        self.factory.get_connection_stats().await
    }

    /// Shutdown all clients and connections
    pub async fn shutdown(self) {
        if let Some(mut client) = self.trading_client {
            client.shutdown().await;
        }
        if let Some(mut client) = self.backtesting_client {
            client.shutdown().await;
        }
        if let Some(mut client) = self.ml_training_client {
            client.shutdown().await;
        }

        self.factory.shutdown().await;
    }
}

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

    #[test]
    fn test_client_factory_creation() {
        let config = connection_manager::ConnectionConfig::default();
        let factory = ClientFactory::new(config);

        // Test that factory can create clients
        let trading_config = trading_client::TradingClientConfig::default();
        let _trading_client = factory.create_trading_client(trading_config);
    }

    #[test]
    fn test_builder_pattern() {
        let builder = TliClientBuilder::new()
            .with_service_endpoint(
                "trading_service".to_owned(),
                "http://localhost:50051".to_owned(),
            )
            .with_trading_config(trading_client::TradingClientConfig::default())
            .with_backtesting_config(backtesting_client::BacktestingClientConfig::default())
            .with_ml_training_config(ml_training_client::MLTrainingClientConfig::default());

        // Builder should have the configuration set
        assert!(builder.trading_config.is_some());
        assert!(builder.backtesting_config.is_some());
        assert!(builder.ml_training_config.is_some());
        assert!(builder.service_endpoints.contains_key("trading_service"));
    }
}