TorbatYar/frontend/app/api/loyalty/[...path]/route.ts

import { NextRequest, NextResponse } from "next/server";

/**
 * Same-origin BFF proxy → Loyalty service (:8004).
 */
const UPSTREAM =
  process.env.LOYALTY_SERVICE_URL ||
  process.env.NEXT_PUBLIC_LOYALTY_API_URL ||
  "http://localhost:8004";

async function proxy(req: NextRequest, pathSegments: string[]) {
  const path = pathSegments.join("/");
  const url = new URL(req.url);
  const target = `${UPSTREAM.replace(/\/$/, "")}/${path}${url.search}`;

  const headers = new Headers();
  const pass = ["authorization", "content-type", "x-tenant-id", "accept"];
  for (const h of pass) {
    const v = req.headers.get(h);
    if (v) headers.set(h, v);
  }

  let body: ArrayBuffer | undefined;
  if (req.method !== "GET" && req.method !== "HEAD") {
    body = await req.arrayBuffer();
  }

  try {
    const res = await fetch(target, {
      method: req.method,
      headers,
      body,
      cache: "no-store",
    });
    const outHeaders = new Headers();
    const ct = res.headers.get("content-type");
    if (ct) outHeaders.set("content-type", ct);
    return new NextResponse(await res.arrayBuffer(), {
      status: res.status,
      headers: outHeaders,
    });
  } catch (err) {
    const detail = err instanceof Error ? err.message : "upstream_unreachable";
    return NextResponse.json(
      {
        error: {
          code: "loyalty_proxy_error",
          message: `پروکسی Loyalty به ${UPSTREAM} وصل نشد — ${detail}`,
        },
      },
      { status: 502 }
    );
  }
}

export async function GET(
  req: NextRequest,
  ctx: { params: Promise<{ path: string[] }> }
) {
  const { path } = await ctx.params;
  return proxy(req, path);
}

export async function POST(
  req: NextRequest,
  ctx: { params: Promise<{ path: string[] }> }
) {
  const { path } = await ctx.params;
  return proxy(req, path);
}

export async function PATCH(
  req: NextRequest,
  ctx: { params: Promise<{ path: string[] }> }
) {
  const { path } = await ctx.params;
  return proxy(req, path);
}

export async function PUT(
  req: NextRequest,
  ctx: { params: Promise<{ path: string[] }> }
) {
  const { path } = await ctx.params;
  return proxy(req, path);
}

export async function DELETE(
  req: NextRequest,
  ctx: { params: Promise<{ path: string[] }> }
) {
  const { path } = await ctx.params;
  return proxy(req, path);
}