#!/usr/bin/env node
// E2E fake ffprobe. The duration guard invokes:
//   ffprobe -v error -show_entries format=duration -of default=...:nokey=1 <file>
// We report a duration read from a marker the fake-ytdlp embeds in the audio
// file (`__DUR=<seconds>__`). A file with no marker reports a large duration so
// the guard never falsely trips on it (matches a full-length download).
import { readFile } from "node:fs/promises";
import { installFixtureWatchdog } from "./_watchdog.mjs";

// Never outlive the run that spawned us — see _watchdog.mjs.
installFixtureWatchdog();

const argv = process.argv.slice(2);
// The input file is the only non-flag argument (and not a value of -show_entries
// / -of). It's the last positional in the guard's invocation.
const file = argv[argv.length - 1];

async function main() {
  if (!file || file.startsWith("-")) {
    process.stderr.write("[fake-ffprobe] missing input file\n");
    process.exit(1);
  }
  let buf;
  try {
    buf = await readFile(file, "utf8");
  } catch {
    process.stderr.write(`[fake-ffprobe] cannot read ${file}\n`);
    process.exit(1);
  }
  const m = buf.match(/__DUR=([0-9]+(?:\.[0-9]+)?)__/);
  // No marker -> report a long duration so isShortAudio() stays false.
  const seconds = m ? m[1] : "100000";
  process.stdout.write(`${seconds}\n`);
}

main();