/**
 * Paper Trading Controller
 * Handles paper trading account and position endpoints
 */

import type { Request, Response, NextFunction } from 'express';
import { paperTradingService, TradeDirection } from '../services/paper-trading.service';
import type { AuthenticatedRequest } from '../../../core/guards/auth.guard';

// ============================================================================
// Account Endpoints
// ============================================================================

export async function getAccount(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const account = await paperTradingService.getOrCreateAccount(authReq.user.id);
    res.json({ success: true, data: account });
  } catch (error) {
    next(error);
  }
}

export async function getAccounts(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const accounts = await paperTradingService.getUserAccounts(authReq.user.id);
    res.json({ success: true, data: accounts });
  } catch (error) {
    next(error);
  }
}

export async function createAccount(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { name, initialBalance, currency } = req.body;

    const account = await paperTradingService.createAccount(authReq.user.id, {
      name,
      initialBalance,
      currency,
    });

    res.status(201).json({ success: true, data: account });
  } catch (error) {
    next(error);
  }
}

export async function resetAccount(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { accountId } = req.params;

    const account = await paperTradingService.resetAccount(accountId, authReq.user.id);

    if (!account) {
      res.status(404).json({ success: false, error: 'Account not found or unauthorized' });
      return;
    }

    res.json({ success: true, data: account, message: 'Account reset successfully' });
  } catch (error) {
    next(error);
  }
}

export async function getAccountSummary(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { accountId } = req.params;

    const summary = await paperTradingService.getAccountSummary(authReq.user.id, accountId);

    if (!summary) {
      res.status(404).json({ success: false, error: 'Account not found' });
      return;
    }

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

// ============================================================================
// Position Endpoints
// ============================================================================

export async function openPosition(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { symbol, direction, lotSize, entryPrice, stopLoss, takeProfit } = req.body;

    if (!symbol || !direction || !lotSize) {
      res.status(400).json({
        success: false,
        error: 'Symbol, direction, and lotSize are required',
      });
      return;
    }

    const validDirections: TradeDirection[] = ['long', 'short'];
    if (!validDirections.includes(direction)) {
      res.status(400).json({
        success: false,
        error: `Invalid direction. Must be one of: ${validDirections.join(', ')}`,
      });
      return;
    }

    if (lotSize <= 0) {
      res.status(400).json({
        success: false,
        error: 'Lot size must be greater than 0',
      });
      return;
    }

    const position = await paperTradingService.openPosition(authReq.user.id, {
      symbol,
      direction,
      lotSize,
      entryPrice,
      stopLoss,
      takeProfit,
    });

    res.status(201).json({ success: true, data: position });
  } catch (error) {
    next(error);
  }
}

export async function closePosition(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { positionId } = req.params;
    const { exitPrice, closeReason } = req.body;

    const position = await paperTradingService.closePosition(positionId, authReq.user.id, {
      exitPrice,
      closeReason,
    });

    if (!position) {
      res.status(404).json({ success: false, error: 'Position not found or already closed' });
      return;
    }

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

export async function getPosition(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { positionId } = req.params;

    const position = await paperTradingService.getPosition(positionId, authReq.user.id);

    if (!position) {
      res.status(404).json({ success: false, error: 'Position not found' });
      return;
    }

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

export async function getPositions(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { accountId, status, symbol, limit } = req.query;

    const positions = await paperTradingService.getPositions(authReq.user.id, {
      accountId: accountId as string,
      status: status as 'open' | 'closed' | 'pending',
      symbol: symbol as string,
      limit: limit ? parseInt(limit as string, 10) : undefined,
    });

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

export async function updatePosition(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { positionId } = req.params;
    const { stopLoss, takeProfit } = req.body;

    const position = await paperTradingService.updatePosition(positionId, authReq.user.id, {
      stopLoss,
      takeProfit,
    });

    if (!position) {
      res.status(404).json({ success: false, error: 'Position not found or not open' });
      return;
    }

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

// ============================================================================
// Trade History & Analytics
// ============================================================================

export async function getTradeHistory(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { accountId, symbol, startDate, endDate, limit } = req.query;

    const trades = await paperTradingService.getTradeHistory(authReq.user.id, {
      accountId: accountId as string,
      symbol: symbol as string,
      startDate: startDate ? new Date(startDate as string) : undefined,
      endDate: endDate ? new Date(endDate as string) : undefined,
      limit: limit ? parseInt(limit as string, 10) : undefined,
    });

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

export async function getPerformanceStats(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { accountId } = req.query;

    const stats = await paperTradingService.getPerformanceStats(
      authReq.user.id,
      accountId as string | undefined
    );

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