import { NextRequest, NextResponse } from "next/server";
import { headers } from "next/headers";
import Stripe from "stripe";
import { getStripe, getStripeWebhookSecret } from "@/src/lib/stripe";
import { prisma } from "@/src/lib/prisma";

export const dynamic = "force-dynamic";

export async function POST(request: NextRequest) {
  const payload = await request.text();
  const headerPayload = await headers();
  const signature = headerPayload.get("stripe-signature") || "";

  // Determine which Stripe account this webhook belongs to
  // Stripe sends the account ID in the Stripe-Account header for Connect
  const accountId = headerPayload.get("stripe-account") || "";
  let houseId: string;

  if (process.env.STRIPE_ACCOUNT_HERDWEWEG && accountId === process.env.STRIPE_ACCOUNT_HERDWEWEG) {
    houseId = "herdweg";
  } else if (process.env.STRIPE_ACCOUNT_SCHOENAICHER && accountId === process.env.STRIPE_ACCOUNT_SCHOENAICHER) {
    houseId = "schoenaicher";
  } else {
    // If no account header, try to infer from event metadata (not available in signature verification)
    // For now, we'll try both secrets. In production, use separate webhook endpoints or account headers.
    return NextResponse.json(
      { error: "Could not determine Stripe account" },
      { status: 400 }
    );
  }

  try {
    const stripe = getStripe(houseId);
    const webhookSecret = getStripeWebhookSecret(houseId);
    const event = stripe.webhooks.constructEvent(payload, signature, webhookSecret);

    // Deduplicate events
    const existingEvent = await prisma.stripeEvent.findUnique({
      where: { eventId: event.id },
    });
    if (existingEvent) {
      return NextResponse.json({ received: true });
    }

    await prisma.stripeEvent.create({
      data: {
        eventId: event.id,
        accountId,
        type: event.type,
        payload: JSON.stringify(event),
      },
    });

    if (event.type === "checkout.session.completed") {
      const session = event.data.object as Stripe.Checkout.Session;
      const bookingReference = session.metadata?.bookingReference;

      if (bookingReference) {
        await prisma.booking.update({
          where: { bookingReference },
          data: {
            status: "deposit_paid",
            stripePaymentIntentId: session.payment_intent as string,
          },
        });

        // TODO: Trigger n8n workflow to create booking in Beds24
        console.log(`Deposit paid for booking ${bookingReference}`);
      }
    }

    return NextResponse.json({ received: true });
  } catch (error) {
    console.error("Stripe webhook error:", error);
    return NextResponse.json(
      { error: "Webhook verification failed" },
      { status: 400 }
    );
  }
}