import Stripe from 'stripe';

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

export default async function handler(req, res) {
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'POST, OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
  if (req.method === 'OPTIONS') return res.status(200).end();
  if (req.method !== 'POST') return res.status(405).json({ error: 'Method not allowed' });

  try {
    const { useCase } = req.body;

    const UC_NAMES = {
      rupture: 'Rupture & Séparation',
      solitude: 'Solitude & Isolement',
      stress: 'Stress & Anxiété',
      carriere: 'Travail & Carrière'
    };

    const session = await stripe.checkout.sessions.create({
      payment_method_types: ['card'],
      line_items: [{
        price_data: {
          currency: 'eur',
          product_data: {
            name: `MonShrink — ${UC_NAMES[useCase] || 'Séance guidée'}`,
            description: 'Séance de soutien psychologique guidée de 15 minutes. Paiement unique, sans abonnement.',
          },
          unit_amount: 499, // 4,99€ en centimes
        },
        quantity: 1,
      }],
      mode: 'payment',
      success_url: `${req.headers.origin}/seance?uc=${useCase}&session_id={CHECKOUT_SESSION_ID}`,
      cancel_url: `${req.headers.origin}/`,
      locale: 'fr',
      payment_intent_data: {
        metadata: { useCase }
      }
    });

    return res.status(200).json({ url: session.url });

  } catch (err) {
    console.error('Stripe error:', err);
    return res.status(500).json({ error: err.message });
  }
}