import { NextRequest, NextResponse } from "next/server";
import { midtransWebhookSchema } from "@/lib/midtrans";
import { paymentService } from "@/server/services/payment.service";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

/**
 * Webhook callback dari Midtrans.
 *
 * Aturan response:
 * - Body bukan JSON / shape tidak valid → 400 (Midtrans tetap retry, tapi mereka pasti
 *   kirim shape valid; 400 di sini = bug bukan dari Midtrans).
 * - Signature mismatch → 401 (Midtrans tidak retry untuk auth error).
 * - Sudah final / unknown order / amount mismatch → 200 OK + log
 *   (kita tidak mau Midtrans retry forever untuk kasus yang server-side perlu manual review).
 * - Sukses update → 200 OK.
 *
 * URL ini harus didaftarkan di dashboard Midtrans:
 * `<NEXT_PUBLIC_SITE_URL>/api/webhooks/midtrans`.
 */
export async function POST(req: NextRequest) {
  let raw: unknown;
  try {
    raw = await req.json();
  } catch {
    return NextResponse.json({ error: "Body bukan JSON valid" }, { status: 400 });
  }

  const parsed = midtransWebhookSchema.safeParse(raw);
  if (!parsed.success) {
    console.warn(
      "[midtrans-webhook] payload schema invalid",
      parsed.error.issues.map((i) => `${i.path.join(".")}: ${i.message}`)
    );
    return NextResponse.json(
      { error: "Payload schema invalid" },
      { status: 400 }
    );
  }
  const body = parsed.data;

  let outcome;
  try {
    outcome = await paymentService.handleMidtransWebhook(body);
  } catch (err) {
    console.error("[midtrans-webhook] gagal proses callback", err, {
      order_id: body.order_id,
    });
    return NextResponse.json(
      { error: "Gagal memproses callback" },
      { status: 500 }
    );
  }

  if (!outcome.ok) {
    if (outcome.reason === "signature_mismatch") {
      console.warn("[midtrans-webhook] signature mismatch", {
        order_id: body.order_id,
      });
      return NextResponse.json({ error: "Invalid signature" }, { status: 401 });
    }
    if (outcome.reason === "amount_mismatch") {
      console.warn("[midtrans-webhook] amount mismatch", {
        order_id: body.order_id,
        gross_amount: body.gross_amount,
      });
      // Return 200 supaya Midtrans tidak retry; investigasi via log.
      return NextResponse.json({ status: "amount_mismatch_logged" });
    }
  }

  if (outcome.ok && outcome.status === "booking_conflict") {
    console.warn(
      "[midtrans-webhook] PAID arrived for booking in conflict state — manual review required",
      { order_id: body.order_id, transaction_id: body.transaction_id }
    );
  }

  return NextResponse.json({ status: outcome.ok ? outcome.status : "error" });
}