import { Router, Response } from 'express';
import { store } from '../services/Store';
import { paymentProvider } from '../services/PaymentProvider';
import { keyActivationProvider } from '../services/KeyActivationProvider';
import { encryptionService } from '../utils/encryption';
import { mockAuthMiddleware, requireSteamAuth } from '../middleware/auth';
import { config } from '../config';
import { CreateTransactionDto } from '../models';

const router = Router();

router.post('/', mockAuthMiddleware, async (req, res: Response) => {
  const { listingId } = req.body as CreateTransactionDto;
  
  if (!listingId) {
    return res.status(400).json({
      success: false,
      error: 'listingId is required',
    });
  }
  
  const listing = store.getListingById(listingId);
  
  if (!listing) {
    return res.status(404).json({ success: false, error: 'Listing not found' });
  }
  
  if (listing.status !== 'ACTIVE') {
    return res.status(400).json({
      success: false,
      error: 'Listing is not available',
    });
  }
  
  if (listing.sellerId === req.userId) {
    return res.status(400).json({
      success: false,
      error: 'Cannot buy your own listing',
    });
  }
  
  const holdResult = await paymentProvider.createHold(listing.price, listing.currency);
  
  if (!holdResult.success) {
    return res.status(400).json({
      success: false,
      error: holdResult.error || 'Payment failed',
    });
  }
  
  const transaction = store.createTransaction({
    listingId: listing.id,
    buyerId: req.userId!,
    sellerId: listing.sellerId,
    amount: listing.price,
    currency: listing.currency,
    escrowStatus: 'HELD',
    transactionStatus: 'PENDING',
    holdId: holdResult.holdId,
    keyDelivered: false,
  });
  
  store.updateListing(listing.id, { status: 'SOLD' });
  
  res.json({
    success: true,
    data: { 
      transaction: {
        id: transaction.id,
        listingId: transaction.listingId,
        amount: transaction.amount,
        currency: transaction.currency,
        escrowStatus: transaction.escrowStatus,
        transactionStatus: transaction.transactionStatus,
      },
    },
  });
});

router.get('/:id', mockAuthMiddleware, (req, res: Response) => {
  const transaction = store.getTransactionById(req.params.id);
  
  if (!transaction) {
    return res.status(404).json({ success: false, error: 'Transaction not found' });
  }
  
  if (transaction.buyerId !== req.userId && transaction.sellerId !== req.userId) {
    return res.status(403).json({ success: false, error: 'Forbidden' });
  }
  
  res.json({
    success: true,
    data: { transaction },
  });
});

router.get('/:id/key', mockAuthMiddleware, (req, res: Response) => {
  const transaction = store.getTransactionById(req.params.id);
  
  if (!transaction) {
    return res.status(404).json({ success: false, error: 'Transaction not found' });
  }
  
  if (transaction.buyerId !== req.userId) {
    return res.status(403).json({ success: false, error: 'Forbidden' });
  }
  
  if (transaction.escrowStatus !== 'HELD') {
    return res.status(400).json({
      success: false,
      error: 'Key only available when payment is held in escrow',
    });
  }
  
  if (transaction.keyDelivered) {
    return res.json({
      success: true,
      data: { 
        keyAlreadyDelivered: true,
        message: 'Key was already delivered in this transaction',
      },
    });
  }
  
  const listing = store.getListingById(transaction.listingId);
  if (!listing) {
    return res.status(404).json({ success: false, error: 'Listing not found' });
  }
  
  const key = encryptionService.decrypt(listing.keyEncrypted);
  
  store.updateTransaction(transaction.id, { keyDelivered: true });
  
  res.json({
    success: true,
    data: { key },
  });
});

router.post('/:id/confirm', requireSteamAuth, async (req, res: Response) => {
  const { status } = req.body;
  
  if (!status || !['SUCCESS', 'FAILED'].includes(status)) {
    return res.status(400).json({
      success: false,
      error: 'status must be SUCCESS or FAILED',
    });
  }
  
  const transaction = store.getTransactionById(req.params.id);
  
  if (!transaction) {
    return res.status(404).json({ success: false, error: 'Transaction not found' });
  }
  
  if (transaction.buyerId !== req.userId) {
    return res.status(403).json({ success: false, error: 'Forbidden' });
  }
  
  if (transaction.transactionStatus !== 'PENDING') {
    return res.status(400).json({
      success: false,
      error: 'Transaction already confirmed or disputed',
    });
  }
  
  if (status === 'SUCCESS') {
    if (transaction.holdId) {
      await paymentProvider.release(transaction.holdId);
    }
    
    store.updateTransaction(transaction.id, {
      escrowStatus: 'RELEASED',
      transactionStatus: 'COMPLETED',
      confirmedAt: new Date(),
    });
    
    res.json({
      success: true,
      data: { 
        message: 'Key confirmed. Payment released to seller.',
        escrowStatus: 'RELEASED',
      },
    });
  } else {
    if (transaction.holdId) {
      await paymentProvider.refund(transaction.holdId);
    }
    
    store.updateTransaction(transaction.id, {
      escrowStatus: 'REFUNDED',
      transactionStatus: 'DISPUTED',
      confirmedAt: new Date(),
    });
    
    res.json({
      success: true,
      data: { 
        message: 'Key marked as failed. Payment refunded to buyer.',
        escrowStatus: 'REFUNDED',
        transactionStatus: 'DISPUTED',
      },
    });
  }
});

router.get('/buyer/me', mockAuthMiddleware, (req, res: Response) => {
  const transactions = store.getTransactionsByBuyer(req.userId!);
  
  res.json({
    success: true,
    data: { transactions },
  });
});

router.get('/seller/me', mockAuthMiddleware, (req, res: Response) => {
  const transactions = store.getTransactionsBySeller(req.userId!);
  
  res.json({
    success: true,
    data: { transactions },
  });
});

export default router;