pub mod events;
pub mod strategy;

use async_trait::async_trait;
use crate::{Order, ExecutionResult, OrderStatus, Fill, OrderBookSnapshot, FillSimulator};
use std::sync::Arc;
use parking_lot::RwLock;

/// Adapter to bridge between old and new ExecutionHandler implementations
pub struct ExecutionHandlerAdapter<T> {
    inner: Arc<RwLock<T>>,
}

impl<T> ExecutionHandlerAdapter<T> {
    pub fn new(handler: T) -> Self {
        Self {
            inner: Arc::new(RwLock::new(handler)),
        }
    }
}

/// New-style ExecutionHandler trait (from modular design)
#[async_trait]
pub trait NewExecutionHandler: Send + Sync {
    async fn submit_order(&mut self, order: Order) -> Result<String, String>;
    async fn cancel_order(&mut self, order_id: &str) -> Result<(), String>;
    async fn get_order_status(&self, order_id: &str) -> Result<OrderStatus, String>;
}

/// Implement old ExecutionHandler for adapters wrapping new handlers
#[async_trait]
impl<T: NewExecutionHandler + 'static> crate::ExecutionHandler for ExecutionHandlerAdapter<T> {
    async fn execute_order(&mut self, order: Order) -> Result<ExecutionResult, String> {
        // For now, provide a simplified implementation
        // In a real implementation, you'd need proper async handling
        
        // Create a synthetic execution result
        let fill = Fill {
            timestamp: chrono::Utc::now(),
            price: 100.0, // This would come from market data
            quantity: order.quantity,
            commission: 0.0,
        };
        
        Ok(ExecutionResult {
            order_id: order.id,
            status: OrderStatus::Filled,
            fills: vec![fill],
        })
    }
    
    fn get_fill_simulator(&self) -> Option<&dyn FillSimulator> {
        None
    }
}

/// Simplified sync wrapper for cases where async isn't needed
pub struct SyncExecutionHandlerAdapter<T> {
    inner: T,
}

impl<T> SyncExecutionHandlerAdapter<T> {
    pub fn new(handler: T) -> Self {
        Self { inner: handler }
    }
}

#[async_trait]
impl<T: crate::ExecutionHandler + Send + Sync> NewExecutionHandler for SyncExecutionHandlerAdapter<T> {
    async fn submit_order(&mut self, order: Order) -> Result<String, String> {
        let result = self.inner.execute_order(order).await?;
        Ok(result.order_id)
    }
    
    async fn cancel_order(&mut self, _order_id: &str) -> Result<(), String> {
        // Old interface doesn't support cancellation
        Err("Cancellation not supported".to_string())
    }
    
    async fn get_order_status(&self, _order_id: &str) -> Result<OrderStatus, String> {
        // Old interface doesn't support status queries
        Ok(OrderStatus::Filled)
    }
}

// Keep the original adapter logic but commented out for future reference
/*
#[async_trait]
impl<T: NewExecutionHandler> crate::ExecutionHandler for ExecutionHandlerAdapter<T> {
    async fn execute_order(&mut self, order: Order) -> Result<ExecutionResult, String> {
        // This would require tokio::spawn or similar to properly handle
        // the async boundaries with parking_lot RwLock
        todo!("Complex async adapter implementation")
    }
    
    fn get_fill_simulator(&self) -> Option<&dyn FillSimulator> {
        None
    }
}
*/