/**
 * Price Alerts Controller
 * Handles price alert endpoints
 */

import type { Request, Response, NextFunction } from 'express';
import { alertsService, AlertCondition } from '../services/alerts.service';
import type { AuthenticatedRequest } from '../../../core/guards/auth.guard';

// ============================================================================
// CRUD Operations
// ============================================================================

export async function createAlert(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { symbol, condition, price, note, notifyEmail, notifyPush, isRecurring } = req.body;

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

    const validConditions: AlertCondition[] = ['above', 'below', 'crosses_above', 'crosses_below'];
    if (!validConditions.includes(condition)) {
      res.status(400).json({
        success: false,
        error: `Invalid condition. Must be one of: ${validConditions.join(', ')}`,
      });
      return;
    }

    const alert = await alertsService.createAlert({
      userId: authReq.user.id,
      symbol,
      condition,
      price,
      note,
      notifyEmail,
      notifyPush,
      isRecurring,
    });

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

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

    const alerts = await alertsService.getUserAlerts(authReq.user.id, {
      isActive: isActive === 'true' ? true : isActive === 'false' ? false : undefined,
      symbol: symbol as string,
      condition: condition as AlertCondition,
    });

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

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

    const alert = await alertsService.getAlertById(alertId);

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

    if (alert.userId !== authReq.user.id) {
      res.status(403).json({ success: false, error: 'Unauthorized' });
      return;
    }

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

export async function updateAlert(req: Request, res: Response, next: NextFunction): Promise<void> {
  try {
    const authReq = req as AuthenticatedRequest;
    const { alertId } = req.params;
    const { price, note, notifyEmail, notifyPush, isRecurring, isActive } = req.body;

    const alert = await alertsService.updateAlert(alertId, authReq.user.id, {
      price,
      note,
      notifyEmail,
      notifyPush,
      isRecurring,
      isActive,
    });

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

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

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

    const deleted = await alertsService.deleteAlert(alertId, authReq.user.id);

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

    res.json({ success: true, message: 'Alert deleted' });
  } catch (error) {
    next(error);
  }
}

// ============================================================================
// Enable/Disable
// ============================================================================

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

    const alert = await alertsService.enableAlert(alertId, authReq.user.id);

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

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

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

    const alert = await alertsService.disableAlert(alertId, authReq.user.id);

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

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

// ============================================================================
// Statistics
// ============================================================================

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