import type { LoaderFunctionArgs } from "@remix-run/server-runtime";
import { prisma } from "~/db.server";
import { metricsRegister } from "~/metrics.server";

export async function loader({ request }: LoaderFunctionArgs) {
  // If the TRIGGER_METRICS_AUTH_PASSWORD is set, we need to check if the request has the correct password in auth header
  const authPassword = process.env.TRIGGER_METRICS_AUTH_PASSWORD;

  if (authPassword) {
    const auth = request.headers.get("Authorization");
    if (auth !== `Bearer ${authPassword}`) {
      return new Response("Unauthorized", { status: 401 });
    }
  }

  // We need to remove empty lines from the prisma metrics, grafana doesn't like them
  const prismaMetrics = (await prisma.$metrics.prometheus()).replace(/^\s*[\r\n]/gm, "");
  const coreMetrics = await metricsRegister.metrics();

  // Order matters, core metrics end with `# EOF`, prisma metrics don't
  const metrics = prismaMetrics + coreMetrics;

  return new Response(metrics, {
    headers: {
      "Content-Type": metricsRegister.contentType,
    },
  });
}