import { getStripeClient } from './client';
import { getDFYProduct } from './dfy-products';
import { prisma } from '@/lib/db';

export interface CreateCheckoutParams {
  userId: string;
  productId: string;
  successUrl: string;
  cancelUrl: string;
}

export async function createDFYCheckoutSession(params: CreateCheckoutParams) {
  const { userId, productId, successUrl, cancelUrl } = params;

  const product = getDFYProduct(productId);
  if (!product) {
    throw new Error(`Invalid product ID: ${productId}`);
  }

  const user = await prisma.user.findUnique({
    where: { id: userId },
    select: { email: true, firstName: true, lastName: true },
  });

  if (!user) {
    throw new Error('User not found');
  }

  const stripe = await getStripeClient();

  const session = await stripe.checkout.sessions.create({
    mode: 'payment',
    customer_email: user.email,
    line_items: [
      {
        price_data: {
          currency: 'usd',
          product_data: {
            name: product.name,
            description: product.description,
            metadata: {
              product_id: productId,
              delivery_days: product.deliveryDays.toString(),
            },
          },
          unit_amount: product.priceInCents,
        },
        quantity: 1,
      },
    ],
    metadata: {
      user_id: userId,
      product_id: productId,
      type: 'dfy_service',
    },
    success_url: successUrl,
    cancel_url: cancelUrl,
  });

  // Create pending DFY request
  await prisma.dFYRequest.create({
    data: {
      userId,
      serviceType: productId,
      status: 'PENDING_PAYMENT',
      stripePaymentId: session.id,
      amountPaid: product.priceInCents,
    },
  });

  return session;
}

export async function handleCheckoutComplete(sessionId: string) {
  const stripe = await getStripeClient();
  const session = await stripe.checkout.sessions.retrieve(sessionId);

  if (session.payment_status !== 'paid') {
    return { success: false, error: 'Payment not completed' };
  }

  const userId = session.metadata?.user_id;
  const productId = session.metadata?.product_id;

  if (!userId || !productId) {
    return { success: false, error: 'Missing metadata' };
  }

  // Update DFY request status
  await prisma.dFYRequest.updateMany({
    where: {
      stripePaymentId: sessionId,
    },
    data: {
      status: 'PAID',
      updatedAt: new Date(),
    },
  });

  return { success: true, userId, productId };
}