use napi_derive::napi;
use napi::bindgen_prelude::*;
use std::sync::Arc;
use chrono::{DateTime, Utc};

#[napi]
pub struct BacktestAPI {
    core: Arc<crate::TradingCore>,
}

impl BacktestAPI {
    pub fn new(core: Arc<crate::TradingCore>) -> Self {
        Self { core }
    }
}

#[napi]
impl BacktestAPI {
    #[napi]
    pub async fn configure(
        &self,
        start_date: String,
        end_date: String,
        symbols: Vec<String>,
        initial_capital: f64,
        commission: f64,
        slippage: f64,
    ) -> Result<()> {
        // Parse dates
        let start = DateTime::parse_from_rfc3339(&start_date)
            .map_err(|e| Error::from_reason(format!("Invalid start date: {}", e)))?
            .with_timezone(&Utc);
        let end = DateTime::parse_from_rfc3339(&end_date)
            .map_err(|e| Error::from_reason(format!("Invalid end date: {}", e)))?
            .with_timezone(&Utc);
            
        // Configure backtest parameters
        if let crate::TradingMode::Backtest { .. } = self.core.get_mode() {
            // Update backtest configuration
            todo!("Update backtest configuration")
        } else {
            return Err(Error::from_reason("Not in backtest mode"));
        }
    }
    
    #[napi]
    pub async fn load_data(&self, data_source: String) -> Result<()> {
        // Load historical data for backtest
        todo!("Load historical data")
    }
    
    #[napi]
    pub async fn run(&self) -> Result<JsObject> {
        // Run the backtest
        if let crate::TradingMode::Backtest { .. } = self.core.get_mode() {
            // Execute backtest
            todo!("Execute backtest")
        } else {
            return Err(Error::from_reason("Not in backtest mode"));
        }
    }
    
    #[napi]
    pub fn get_progress(&self) -> Result<f64> {
        // Get backtest progress (0.0 to 1.0)
        todo!("Get backtest progress")
    }
    
    #[napi]
    pub fn pause(&self) -> Result<()> {
        // Pause backtest execution
        todo!("Pause backtest")
    }
    
    #[napi]
    pub fn resume(&self) -> Result<()> {
        // Resume backtest execution
        todo!("Resume backtest")
    }
    
    #[napi]
    pub fn get_results(&self) -> Result<JsObject> {
        // Get backtest results
        todo!("Get backtest results")
    }
}