import { PrismaClient } from '@prisma/client';
const prisma = new PrismaClient();

async function backfill() {
  const schedules = await prisma.pOPaymentSchedule.findMany({
    include: { installments: { orderBy: { sortOrder: 'desc' } } },
  });

  console.log(`Found ${schedules.length} payment schedules`);
  let totalPatched = 0;

  for (const s of schedules) {
    let toMark: number[] = [];

    if (s.paymentType === 'POST_DELIVERY') {
      toMark = s.installments.map(i => i.id);
    } else if (s.paymentType === 'INSTALLMENT') {
      if (s.installments.length > 0) {
        toMark = [s.installments[0].id]; // [0] car orderBy desc → dernier sortOrder
      }
    }

    if (toMark.length > 0) {
      const r = await prisma.pOInstallment.updateMany({
        where: { id: { in: toMark } },
        data: { isPostDelivery: true },
      });
      console.log(`  Schedule ${s.id} (PO ${s.purchaseOrderId}, type=${s.paymentType}): ${r.count} installments → isPostDelivery=true`);
      totalPatched += r.count;
    }
  }

  console.log(`\nBackfill terminé : ${totalPatched} installments marqués isPostDelivery=true`);
  console.log(`postpayMode reste à default 'SIMPLE' pour tous les schedules existants (rétrocompat).`);
}

backfill().catch(e => { console.error(e); process.exit(1); }).finally(() => prisma.$disconnect());