import {
  AUTH_COOKIE_NAME,
  BE_BASE_URL,
  REVALIDATE_SECONDS,
  getAdminResourceCacheTag,
} from "@/app/services/constants";
import { NextRequest, NextResponse } from "next/server";
import { buildFilterParam } from "../utils";

const ALLOWED_RESOURCES = [
  "groups",
  "currencies",
  "permissions",
  "merchants",
  "sessions",
  "users",
];

export async function POST(
  request: NextRequest,
  context: { params: Promise<{ resource: string }> }
) {
  try {
    const { resource } = await context.params;

    if (!ALLOWED_RESOURCES.includes(resource)) {
      return NextResponse.json(
        { message: `Resource '${resource}' is not allowed` },
        { status: 400 }
      );
    }

    const { cookies } = await import("next/headers");
    const cookieStore = await cookies();
    const token = cookieStore.get(AUTH_COOKIE_NAME)?.value;

    if (!token) {
      return NextResponse.json(
        { message: "Missing Authorization header" },
        { status: 401 }
      );
    }

    const body = await request.json();
    const { filters = {}, pagination = { page: 1, limit: 100 }, sort } = body;

    const queryParams = new URLSearchParams();
    queryParams.set("limit", String(pagination.limit ?? 100));
    queryParams.set("page", String(pagination.page ?? 1));

    if (sort?.field && sort?.order) {
      queryParams.set("sort", `${sort.field}:${sort.order}`);
    }

    const filterParam = buildFilterParam(filters);
    if (filterParam) {
      queryParams.set("filter", filterParam);
    }

    const backendUrl = `${BE_BASE_URL}/api/v1/${resource}${
      queryParams.size ? `?${queryParams.toString()}` : ""
    }`;

    const response = await fetch(backendUrl, {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
        Authorization: `Bearer ${token}`,
      },
      next: {
        revalidate: REVALIDATE_SECONDS,
        tags: [getAdminResourceCacheTag(resource)],
      },
    });

    if (!response.ok) {
      const errorData = await response
        .json()
        .catch(() => ({ message: `Failed to fetch ${resource}` }));

      return NextResponse.json(
        {
          success: false,
          message: errorData?.message || `Failed to fetch ${resource}`,
        },
        { status: response.status }
      );
    }

    const data = await response.json();
    return NextResponse.json(data, { status: response.status });
  } catch (err: unknown) {
    let resourceName = "resource";
    try {
      const { resource } = await context.params;
      resourceName = resource;
    } catch {
      // If we can't get resource, use default
    }
    console.error(
      `Proxy POST /api/dashboard/admin/${resourceName} error:`,
      err
    );
    const errorMessage = err instanceof Error ? err.message : "Unknown error";
    return NextResponse.json(
      { message: "Internal server error", error: errorMessage },
      { status: 500 }
    );
  }
}