/**
 * ML Controller
 * Handles ML Engine integration endpoints
 */

import { Request, Response, NextFunction } from 'express';
import {
  mlIntegrationService,
  TimeHorizon,
  SignalType,
} from '../services/ml-integration.service';

// ============================================================================
// Types
// ============================================================================

// Use Request directly - user is already declared globally in auth.middleware.ts
type AuthRequest = Request;

// ============================================================================
// Health & Status
// ============================================================================

/**
 * Get ML Engine health status
 */
export async function getHealth(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const health = await mlIntegrationService.getHealth();

    res.json({
      success: true,
      data: health,
    });
  } catch (error) {
    next(error);
  }
}

/**
 * Check ML Engine connection
 */
export async function checkConnection(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const isConnected = await mlIntegrationService.checkConnection();

    res.json({
      success: true,
      data: { connected: isConnected },
    });
  } catch (error) {
    next(error);
  }
}

// ============================================================================
// Signals
// ============================================================================

/**
 * Get trading signal for a symbol
 */
export async function getSignal(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { symbol } = req.params;
    const { timeHorizon = 'intraday' } = req.query;

    const signal = await mlIntegrationService.getSignal(
      symbol,
      timeHorizon as TimeHorizon
    );

    res.json({
      success: true,
      data: signal,
    });
  } catch (error) {
    next(error);
  }
}

/**
 * Get signals for multiple symbols
 */
export async function getSignals(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { symbols, timeHorizon = 'intraday' } = req.body;

    if (!symbols || !Array.isArray(symbols) || symbols.length === 0) {
      res.status(400).json({
        success: false,
        error: { message: 'Symbols array is required', code: 'VALIDATION_ERROR' },
      });
      return;
    }

    const signals = await mlIntegrationService.getSignals(
      symbols,
      timeHorizon as TimeHorizon
    );

    res.json({
      success: true,
      data: signals,
    });
  } catch (error) {
    next(error);
  }
}

/**
 * Get historical signals
 */
export async function getHistoricalSignals(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { symbol } = req.params;
    const { startTime, endTime, limit, signalType } = req.query;

    const signals = await mlIntegrationService.getHistoricalSignals(symbol, {
      startTime: startTime ? new Date(startTime as string) : undefined,
      endTime: endTime ? new Date(endTime as string) : undefined,
      limit: limit ? Number(limit) : undefined,
      signalType: signalType as SignalType | undefined,
    });

    res.json({
      success: true,
      data: signals,
    });
  } catch (error) {
    next(error);
  }
}

// ============================================================================
// Predictions
// ============================================================================

/**
 * Get price prediction
 */
export async function getPrediction(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { symbol } = req.params;
    const { horizonMinutes = 90 } = req.query;

    const prediction = await mlIntegrationService.getPrediction(
      symbol,
      Number(horizonMinutes)
    );

    res.json({
      success: true,
      data: prediction,
    });
  } catch (error) {
    next(error);
  }
}

/**
 * Get AMD phase prediction
 */
export async function getAMDPhase(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { symbol } = req.params;

    const amdPhase = await mlIntegrationService.getAMDPhase(symbol);

    res.json({
      success: true,
      data: amdPhase,
    });
  } catch (error) {
    next(error);
  }
}

// ============================================================================
// Indicators
// ============================================================================

/**
 * Get technical indicators
 */
export async function getIndicators(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { symbol } = req.params;

    const indicators = await mlIntegrationService.getIndicators(symbol);

    res.json({
      success: true,
      data: indicators,
    });
  } catch (error) {
    next(error);
  }
}

// ============================================================================
// Backtesting
// ============================================================================

/**
 * Run backtest
 */
export async function runBacktest(req: AuthRequest, res: Response, next: NextFunction): Promise<void> {
  try {
    const userId = req.user?.id;
    if (!userId) {
      res.status(401).json({
        success: false,
        error: { message: 'Unauthorized', code: 'UNAUTHORIZED' },
      });
      return;
    }

    const { symbol, startDate, endDate, initialCapital, strategy, params } = req.body;

    if (!symbol || !startDate || !endDate) {
      res.status(400).json({
        success: false,
        error: { message: 'Symbol, startDate, and endDate are required', code: 'VALIDATION_ERROR' },
      });
      return;
    }

    const result = await mlIntegrationService.runBacktest(symbol, {
      startDate: new Date(startDate),
      endDate: new Date(endDate),
      initialCapital,
      strategy,
      params,
    });

    res.json({
      success: true,
      data: result,
    });
  } catch (error) {
    next(error);
  }
}

// ============================================================================
// Models (Admin)
// ============================================================================

/**
 * Get available models
 */
export async function getModels(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const models = await mlIntegrationService.getModels();

    res.json({
      success: true,
      data: models,
    });
  } catch (error) {
    next(error);
  }
}

/**
 * Trigger model retraining
 */
export async function triggerRetraining(req: AuthRequest, res: Response, next: NextFunction): Promise<void> {
  try {
    // TODO: Add admin check
    const { symbol } = req.body;

    const result = await mlIntegrationService.triggerRetraining(symbol);

    res.json({
      success: true,
      data: result,
    });
  } catch (error) {
    next(error);
  }
}

/**
 * Get retraining job status
 */
export async function getRetrainingStatus(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const { jobId } = req.params;

    const status = await mlIntegrationService.getRetrainingStatus(jobId);

    res.json({
      success: true,
      data: status,
    });
  } catch (error) {
    next(error);
  }
}