import { NextResponse } from "next/server";
import { stripeClient } from "../../../../lib/stripeClient";
import { prisma } from "../../../../lib/prisma";

export const runtime = "nodejs";

export async function POST(req: Request) {
  const webhookSecret = process.env.STRIPE_CHECKOUT_WEBHOOK_SECRET;
  if (!webhookSecret) {
    return NextResponse.json(
      { error: "Missing STRIPE_CHECKOUT_WEBHOOK_SECRET." },
      { status: 500 }
    );
  }

  const signature = req.headers.get("stripe-signature");
  if (!signature) {
    return NextResponse.json({ error: "Missing Stripe signature." }, { status: 400 });
  }

  const rawBody = Buffer.from(await req.arrayBuffer());

  try {
    const event = stripeClient.webhooks.constructEvent(
      rawBody,
      signature,
      webhookSecret
    );

    if (event.type === "checkout.session.completed") {
      const session = event.data.object as any;
      const checkoutId = session.id as string;

      const order = await prisma.order.findUnique({
        where: { stripeCheckoutSessionId: checkoutId },
      });

      if (order) {
        await prisma.order.update({
          where: { id: order.id },
          data: {
            status: "paid",
          },
        });
      }
    }

    return NextResponse.json({ received: true });
  } catch (err: any) {
    return NextResponse.json(
      { error: err?.message || "Webhook handler failed." },
      { status: 400 }
    );
  }
}