import { NextRequest, NextResponse } from 'next/server'
import { getStripe, getStripeConfig } from '@/lib/stripe'
import { prisma } from '@/lib/db'

export const dynamic = 'force-dynamic'

export async function POST(req: NextRequest) {
  try {
    const stripe = await getStripe()
    const config = await getStripeConfig()
    if (!stripe || !config) {
      return NextResponse.json({ error: 'Stripe not configured' }, { status: 503 })
    }

    const body = await req.text()
    const sig = req.headers.get('stripe-signature')

    if (!sig) {
      return NextResponse.json({ error: 'Missing signature' }, { status: 400 })
    }

    let event
    try {
      if (config.webhookSecret) {
        event = stripe.webhooks.constructEvent(body, sig, config.webhookSecret)
      } else {
        // No webhook secret configured — parse event directly (not recommended for production)
        event = JSON.parse(body)
      }
    } catch (err) {
      console.error('Webhook signature verification failed:', err)
      return NextResponse.json({ error: 'Invalid signature' }, { status: 400 })
    }

    if (event.type === 'checkout.session.completed') {
      const session = event.data.object
      const metadata = session.metadata || {}

      if (metadata.type === 'donation') {
        // Store donation record
        try {
          await (prisma as any).systemSetting.create({
            data: {
              key: `donation_${Date.now()}`,
              value: JSON.stringify({
                amount: (session.amount_total || 0) / 100,
                currency: session.currency,
                donor: metadata.donor_name || 'Anonym',
                message: metadata.donor_message || '',
                paymentId: session.payment_intent,
                date: new Date().toISOString(),
              }),
              isSecret: false,
              category: 'donations',
            },
          })
        } catch (e) {
          console.error('Failed to store donation record:', e)
        }

        console.log(`[Donation] CHF ${(session.amount_total || 0) / 100} from ${metadata.donor_name || 'Anonym'}`)
      }
    }

    return NextResponse.json({ received: true })
  } catch (error) {
    console.error('Webhook error:', error)
    return NextResponse.json({ error: 'Webhook processing failed' }, { status: 500 })
  }
}