import {
  BaseHandler,
  Handler,
  Operation,
} from '@stock-bot/handlers';
import { getLogger } from '@stock-bot/logger';
import type { OrchestratorServices } from '../../types';

const logger = getLogger('backtest-handler');

interface BacktestPayload {
  backtestId: string;
  strategy: string;
  symbols: string[];
  startDate: string;
  endDate: string;
  initialCapital: number;
  config?: Record<string, any>;
}

interface CancelBacktestPayload {
  backtestId: string;
}

@Handler('orchestrator')
export class BacktestHandler extends BaseHandler<OrchestratorServices> {
  
  @Operation('run-backtest')
  async runBacktest(payload: BacktestPayload) {
    const { backtestId, strategy, symbols, startDate, endDate, initialCapital, config } = payload;
    
    logger.info('Starting backtest', { backtestId, strategy, symbolCount: symbols.length });
    
    try {
      // Update status in web-api (via Redis or direct DB update)
      await this.updateBacktestStatus(backtestId, 'running');
      
      // TODO: Call Rust core via NAPI bindings
      // For now, we'll simulate the backtest
      const results = await this.simulateBacktest({
        strategy,
        symbols,
        startDate,
        endDate,
        initialCapital,
        config,
      });
      
      // Store results
      await this.storeBacktestResults(backtestId, results);
      
      // Update status to completed
      await this.updateBacktestStatus(backtestId, 'completed');
      
      logger.info('Backtest completed', { backtestId });
      
      return { success: true, backtestId, results };
    } catch (error) {
      logger.error('Backtest failed', { backtestId, error });
      
      await this.updateBacktestStatus(backtestId, 'failed', error.message);
      
      throw error;
    }
  }
  
  @Operation('cancel-backtest')
  async cancelBacktest(payload: CancelBacktestPayload) {
    const { backtestId } = payload;
    
    logger.info('Cancelling backtest', { backtestId });
    
    // TODO: Implement actual cancellation logic
    // For now, just update the status
    await this.updateBacktestStatus(backtestId, 'cancelled');
    
    return { success: true, backtestId };
  }
  
  private async updateBacktestStatus(backtestId: string, status: string, error?: string) {
    // TODO: Update in MongoDB or notify web-api
    logger.info('Updating backtest status', { backtestId, status, error });
  }
  
  private async storeBacktestResults(backtestId: string, results: any) {
    // TODO: Store in MongoDB
    logger.info('Storing backtest results', { backtestId });
  }
  
  private async simulateBacktest(params: Omit<BacktestPayload, 'backtestId'>) {
    // Simulate some processing time
    await new Promise(resolve => setTimeout(resolve, 2000));
    
    // Return mock results
    return {
      metrics: {
        totalReturn: 0.15,
        sharpeRatio: 1.2,
        maxDrawdown: -0.08,
        winRate: 0.55,
        totalTrades: 150,
        profitFactor: 1.8,
      },
      equity: [
        { date: params.startDate, value: params.initialCapital },
        { date: params.endDate, value: params.initialCapital * 1.15 },
      ],
      trades: [
        {
          symbol: params.symbols[0],
          entryDate: params.startDate,
          exitDate: params.endDate,
          entryPrice: 100,
          exitPrice: 115,
          quantity: 100,
          pnl: 1500,
        },
      ],
    };
  }
}