import path from "path";
import { pathToFileURL } from "url";
import fs from "fs";

export async function callGate(opts: {
  client: string;
  action: string;
  user?: any;
  session?: any;
  data?: any;
}) {
  const { client, action, user, session, data } = opts;

  // candidate paths to try (dev and prod)
  const candidates = [
    path.join(__dirname, "bank", client, `${action}.ts`),
    path.join(__dirname, "bank", client, `${action}.js`),
  ];

  let lastErr: any = null;
  let existsFile = null as any;
  for (const candidate of candidates) {
    try {
      if (fs.existsSync(candidate)) {
        existsFile = candidate;
        break;
      }
    } catch (ex) {}
  }
  if (!existsFile) {
    throw new Error(`handler not found for gate: ${client}/${action}`);
  }
  let mod: any;
  try {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    mod = require(existsFile);
  } catch (reqErr) {
    // try dynamic import with file:// URL
    const url = pathToFileURL(existsFile).href;
    // eslint-disable-next-line no-await-in-loop
    mod = await import(url);
  }

  if (!mod || typeof mod.default !== "function") {
    throw new Error(
      `handler at ${existsFile} not found or default export not a function`
    );
  }

  // call the handler with (user, session, data)
  return await mod.default({ user, session, data });
}

export default callGate;