import { NextResponse } from 'next/server'
import { FrappeError, METHODS, frappeCall, registrationEnabled } from '@/lib/lukenya-api'

// Asks the backend to open a Paystack checkout for a saved entry and returns its link.
export async function POST(req: Request) {
  if (!registrationEnabled()) {
    return NextResponse.json({ error: 'Online payment is not open yet.' }, { status: 403 })
  }
  const body = await req.json().catch(() => ({}))
  const registration = typeof body.registration === 'string' ? body.registration : ''
  if (!registration) return NextResponse.json({ error: 'No entry to pay for.' }, { status: 400 })

  try {
    const result = await frappeCall<{ authorization_url: string; reference: string }>(METHODS.startPayment, {
      args: {
        registration,
        payment_token: typeof body.payment_token === 'string' ? body.payment_token : undefined,
        channel: body.channel === 'card' ? 'card' : 'mpesa',
      },
      post: true,
    })
    if (!result?.authorization_url) throw new Error('The payment page could not be opened.')
    return NextResponse.json(result)
  } catch (err) {
    const status = err instanceof FrappeError && err.status < 500 ? 400 : 502
    return NextResponse.json({ error: (err as Error).message }, { status })
  }
}