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

export const runtime = "nodejs";

export async function POST(req: Request) {
  const webhookSecret = process.env.STRIPE_SUBSCRIPTION_WEBHOOK_SECRET;
  if (!webhookSecret) {
    return NextResponse.json(
      { error: "Missing STRIPE_SUBSCRIPTION_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
    );

    switch (event.type) {
      case "customer.subscription.updated": {
        const subscription = event.data.object as any;
        const accountId = subscription.customer_account;
        const priceId = subscription.items?.data?.[0]?.price?.id;
        const quantity = subscription.items?.data?.[0]?.quantity;
        const cancelAtPeriodEnd = subscription.cancel_at_period_end;
        const pauseCollection = subscription.pause_collection;

        // TODO: Store subscription status in your DB for accountId.
        // Suggested fields: status, priceId, quantity, cancelAtPeriodEnd, pauseCollection.
        break;
      }
      case "customer.subscription.deleted": {
        const subscription = event.data.object as any;
        const accountId = subscription.customer_account;
        // TODO: Revoke access for accountId in your DB.
        break;
      }
      case "payment_method.attached":
      case "payment_method.detached":
      case "customer.updated":
      case "customer.tax_id.created":
      case "customer.tax_id.deleted":
      case "customer.tax_id.updated":
      case "billing_portal.configuration.created":
      case "billing_portal.configuration.updated":
      case "billing_portal.session.created": {
        // TODO: Update billing info in your DB if needed.
        break;
      }
      default: {
        break;
      }
    }

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