#!/usr/bin/env bun
/**
 * Strategy Service CLI
 * Command-line interface for running backtests and managing strategies
 */
import { program } from 'commander';
import { createEventBus } from '@stock-bot/event-bus';
import { getLogger } from '@stock-bot/logger';
import { EventMode } from '../backtesting/modes/event-mode';
import HybridMode from '../backtesting/modes/hybrid-mode';
import { LiveMode } from '../backtesting/modes/live-mode';
import VectorizedMode from '../backtesting/modes/vectorized-mode';
import { BacktestContext } from '../framework/execution-mode';

const logger = getLogger('strategy-cli');

interface CLIBacktestConfig {
  strategy: string;
  strategies: string;
  symbol: string;
  startDate: string;
  endDate: string;
  mode: 'live' | 'event' | 'vectorized' | 'hybrid';
  initialCapital?: number;
  config?: string;
  output?: string;
  verbose?: boolean;
}

async function runBacktest(options: CLIBacktestConfig): Promise<void> {
  logger.info('Starting backtest from CLI', { options });

  try {
    // Initialize event bus
    const eventBus = createEventBus({
      serviceName: 'strategy-cli',
      enablePersistence: false, // Disable Redis for CLI
    });

    // Create backtest context
    const context: BacktestContext = {
      backtestId: `cli_${Date.now()}`,
      strategy: {
        id: options.strategy,
        name: options.strategy,
        type: options.strategy,
        code: options.strategy,
        parameters: {},
      },
      symbol: options.symbol,
      startDate: options.startDate,
      endDate: options.endDate,
      initialCapital: options.initialCapital || 10000,
      mode: options.mode,
    };

    // Load additional config if provided
    if (options.config) {
      const configData = await loadConfig(options.config);
      context.strategy.parameters = { ...context.strategy.parameters, ...configData };
    }

    // Create and execute the appropriate mode
    let executionMode;

    switch (options.mode) {
      case 'live':
        executionMode = new LiveMode(context, eventBus);
        break;
      case 'event':
        executionMode = new EventMode(context, eventBus);
        break;
      case 'vectorized':
        executionMode = new VectorizedMode(context, eventBus);
        break;
      case 'hybrid':
        executionMode = new HybridMode(context, eventBus);
        break;
      default:
        throw new Error(`Unknown execution mode: ${options.mode}`);
    }

    // Subscribe to progress updates
    eventBus.subscribe('backtest.update', message => {
      const { backtestId, progress, ...data } = message.data;
      console.log(`Progress: ${progress}%`, data);
    });

    await executionMode.initialize();
    const result = await executionMode.execute();
    await executionMode.cleanup();

    // Display results
    displayResults(result);

    // Save results if output specified
    if (options.output) {
      await saveResults(result, options.output);
    }

    await eventBus.close();
  } catch (error) {
    logger.error('Backtest failed', error);
    process.exit(1);
  }
}

async function loadConfig(configPath: string): Promise<any> {
  try {
    if (configPath.endsWith('.json')) {
      const file = Bun.file(configPath);
      return await file.json();
    } else {
      // Assume it's a JavaScript/TypeScript module
      return await import(configPath);
    }
  } catch (error) {
    logger.error('Failed to load config', { configPath, error });
    throw new Error(`Failed to load config from ${configPath}: ${(error as Error).message}`);
  }
}

function displayResults(result: any): void {
  console.log('\n=== Backtest Results ===');
  console.log(`Strategy: ${result.strategy.name}`);
  console.log(`Symbol: ${result.symbol}`);
  console.log(`Period: ${result.startDate} to ${result.endDate}`);
  console.log(`Mode: ${result.mode}`);
  console.log(`Duration: ${result.duration}ms`);

  console.log('\n--- Performance ---');
  console.log(`Total Return: ${(result.performance.totalReturn * 100).toFixed(2)}%`);
  console.log(`Sharpe Ratio: ${result.performance.sharpeRatio.toFixed(3)}`);
  console.log(`Max Drawdown: ${(result.performance.maxDrawdown * 100).toFixed(2)}%`);
  console.log(`Win Rate: ${(result.performance.winRate * 100).toFixed(1)}%`);
  console.log(`Profit Factor: ${result.performance.profitFactor.toFixed(2)}`);

  console.log('\n--- Trading Stats ---');
  console.log(`Total Trades: ${result.performance.totalTrades}`);
  console.log(`Winning Trades: ${result.performance.winningTrades}`);
  console.log(`Losing Trades: ${result.performance.losingTrades}`);
  console.log(`Average Trade: ${result.performance.avgTrade.toFixed(2)}`);
  console.log(`Average Win: ${result.performance.avgWin.toFixed(2)}`);
  console.log(`Average Loss: ${result.performance.avgLoss.toFixed(2)}`);
  console.log(`Largest Win: ${result.performance.largestWin.toFixed(2)}`);
  console.log(`Largest Loss: ${result.performance.largestLoss.toFixed(2)}`);

  if (result.metadata) {
    console.log('\n--- Metadata ---');
    Object.entries(result.metadata).forEach(([key, value]) => {
      console.log(`${key}: ${Array.isArray(value) ? value.join(', ') : value}`);
    });
  }
}

async function saveResults(result: any, outputPath: string): Promise<void> {
  try {
    if (outputPath.endsWith('.json')) {
      await Bun.write(outputPath, JSON.stringify(result, null, 2));
    } else if (outputPath.endsWith('.csv')) {
      const csv = convertTradesToCSV(result.trades);
      await Bun.write(outputPath, csv);
    } else {
      // Default to JSON
      await Bun.write(outputPath + '.json', JSON.stringify(result, null, 2));
    }

    logger.info(`\nResults saved to: ${outputPath}`);
  } catch (error) {
    logger.error('Failed to save results', { outputPath, error });
  }
}

function convertTradesToCSV(trades: any[]): string {
  if (trades.length === 0) return 'No trades executed\n';

  const headers = Object.keys(trades[0]).join(',');
  const rows = trades.map(trade =>
    Object.values(trade)
      .map(value => (typeof value === 'string' ? `"${value}"` : value))
      .join(',')
  );

  return [headers, ...rows].join('\n');
}

async function listStrategies(): Promise<void> {
  console.log('Available strategies:');
  console.log('  sma_crossover  - Simple Moving Average Crossover');
  console.log('  ema_crossover  - Exponential Moving Average Crossover');
  console.log('  rsi_mean_reversion - RSI Mean Reversion');
  console.log('  macd_trend - MACD Trend Following');
  console.log('  bollinger_bands - Bollinger Bands Strategy');
  // Add more as they're implemented
}

async function validateStrategy(strategy: string): Promise<void> {
  console.log(`Validating strategy: ${strategy}`);

  // TODO: Add strategy validation logic
  // This could check if the strategy exists, has valid parameters, etc.

  const validStrategies = [
    'sma_crossover',
    'ema_crossover',
    'rsi_mean_reversion',
    'macd_trend',
    'bollinger_bands',
  ];

  if (!validStrategies.includes(strategy)) {
    console.warn(`Warning: Strategy '${strategy}' is not in the list of known strategies`);
    console.log('Use --list-strategies to see available strategies');
  } else {
    console.log(`✓ Strategy '${strategy}' is valid`);
  }
}

// CLI Commands
program.name('strategy-cli').description('Stock Trading Bot Strategy CLI').version('1.0.0');

program
  .command('backtest')
  .description('Run a backtest')
  .requiredOption('-s, --strategy <strategy>', 'Strategy to test')
  .requiredOption('--symbol <symbol>', 'Symbol to trade')
  .requiredOption('--start-date <date>', 'Start date (YYYY-MM-DD)')
  .requiredOption('--end-date <date>', 'End date (YYYY-MM-DD)')
  .option('-m, --mode <mode>', 'Execution mode', 'vectorized')
  .option('-c, --initial-capital <amount>', 'Initial capital', '10000')
  .option('--config <path>', 'Configuration file path')
  .option('-o, --output <path>', 'Output file path')
  .option('-v, --verbose', 'Verbose output')
  .action(async (options: CLIBacktestConfig) => {
    await runBacktest(options);
  });

program.command('list-strategies').description('List available strategies').action(listStrategies);

program
  .command('validate')
  .description('Validate a strategy')
  .requiredOption('-s, --strategy <strategy>', 'Strategy to validate')
  .action(async (options: CLIBacktestConfig) => {
    await validateStrategy(options.strategy);
  });

program
  .command('compare')
  .description('Compare multiple strategies')
  .requiredOption('--strategies <strategies>', 'Comma-separated list of strategies')
  .requiredOption('--symbol <symbol>', 'Symbol to trade')
  .requiredOption('--start-date <date>', 'Start date (YYYY-MM-DD)')
  .requiredOption('--end-date <date>', 'End date (YYYY-MM-DD)')
  .option('-m, --mode <mode>', 'Execution mode', 'vectorized')
  .option('-c, --initial-capital <amount>', 'Initial capital', '10000')
  .option('-o, --output <path>', 'Output directory')
  .action(async (options: CLIBacktestConfig) => {
    const strategies = options.strategies.split(',').map((s: string) => s.trim());
    console.log(`Comparing strategies: ${strategies.join(', ')}`);

    const results: any[] = [];

    for (const strategy of strategies) {
      console.log(`\nRunning ${strategy}...`);
      try {
        await runBacktest({
          ...options,
          strategy,
          output: options.output ? `${options.output}/${strategy}.json` : undefined,
        });
      } catch (error) {
        console.error(`Failed to run ${strategy}:`, (error as Error).message);
      }
    }

    console.log('\nComparison completed!');
  });

// Parse command line arguments
program.parse();

export { runBacktest, listStrategies, validateStrategy };