#!/usr/bin/env node
// A FAKE `udisksctl`, driven by the same control file as fake-findmnt.
//
// Two call shapes, both from `common/lib/storageVolumes.ts`:
//
//   1. udisksctl --version            → the availability probe (memoised)
//   2. udisksctl mount -b /dev/disk/by-uuid/<uuid>
//        → "Mounted /dev/fake1 at <target>." on success; a non-zero exit with
//          the daemon's words on stderr otherwise (a polkit denial is the
//          expected real-world failure, and the probe surfaces it verbatim)
//
// `mountable` in `<TRANSCRIPTS_DIR>/.fake-findmnt.json` maps uuid → the
// mountpoint a mount would produce, and mounting ADDS the volume to `mounts`
// so a following findmnt sees it. With no control file nothing is mountable,
// which is what `resetData()` leaves behind.

import { readFileSync, writeFileSync } from "node:fs";
import path from "node:path";

const argv = process.argv.slice(2);

if (argv.includes("--version")) {
  process.stdout.write("udisksctl 2.10.1 (fake)\n");
  process.exit(0);
}

const controlPath = process.env.TRANSCRIPTS_DIR
  ? path.join(process.env.TRANSCRIPTS_DIR, ".fake-findmnt.json")
  : null;

function read() {
  if (!controlPath) return null;
  try {
    return JSON.parse(readFileSync(controlPath, "utf8"));
  } catch {
    return null;
  }
}

if (argv[0] === "mount") {
  const i = argv.indexOf("-b");
  const dev = i >= 0 && i + 1 < argv.length ? argv[i + 1] : "";
  const uuid = path.basename(dev);
  const control = read();
  const target = control?.mountable?.[uuid];
  if (!target) {
    process.stderr.write(
      `Error mounting ${dev}: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: ` +
        `No such device (fake)\n`,
    );
    process.exit(1);
  }
  const mounts = Array.isArray(control.mounts) ? control.mounts : [];
  if (!mounts.some((m) => m.uuid === uuid)) {
    mounts.push({ uuid, target, source: "/dev/fake1", fstype: "ext4" });
    writeFileSync(
      controlPath,
      JSON.stringify({ ...control, mounts }, null, 2) + "\n",
    );
  }
  process.stdout.write(`Mounted /dev/fake1 at ${target}.\n`);
  process.exit(0);
}

process.exit(0);