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// DIY: Build your own subscription system
import Stripe from 'stripe';

const stripe = new Stripe(process.env.STRIPE_KEY);

// Create a checkout session
app.post('/create-checkout', async (req, res) => {
  const { userId, plan, platform } = req.body;

  // Look up or create customer
  let customer = await db.customers.findOne({ platform, userId });
  if (!customer) {
    const stripeCustomer = await stripe.customers.create({
      metadata: { platform, userId },
    });
    customer = await db.customers.create({
      stripeId: stripeCustomer.id,
      platform,
      userId,
    });
  }

  // Create the checkout session
  const session = await stripe.checkout.sessions.create({
    customer: customer.stripeId,
    mode: 'subscription',
    line_items: [{ price: PLAN_PRICES[plan], quantity: 1 }],
    success_url: `${BASE_URL}/success`,
    cancel_url: `${BASE_URL}/cancel`,
  });

  res.json({ url: session.url });
});

// Handle webhooks
app.post('/webhooks/stripe', async (req, res) => {
  const sig = req.headers['stripe-signature'];
  const event = stripe.webhooks.constructEvent(
    req.body, sig, WEBHOOK_SECRET
  );

  switch (event.type) {
    case 'checkout.session.completed':
      // Update subscription status in your DB
      break;
    case 'invoice.paid':
      // Handle renewal
      break;
    case 'customer.subscription.deleted':
      // Handle cancellation
      break;
  }

  res.sendStatus(200);
});

// Check subscription in bot handler
bot.on('message', async (ctx) => {
  const sub = await db.subscriptions.findOne({
    platform: 'telegram',
    userId: ctx.from.id.toString(),
  });

  if (sub?.status === 'active' && sub?.plan === 'pro') {
    // Premium feature
  }
});