#!/usr/bin/env node
// E2E fake chough. Mimics the args the chough app builds (transcriptionApps.ts):
//   chough -f json -o <tmpBase> [-c <n>] [-r] <audioFilename>
// Writes the output to EXACTLY <tmpBase> (no ".json" appended — this is the key
// behavioural difference from whisper-cli's -of), in chough's native JSON shape
// { duration_seconds, chunks, text, chunk_data: [{ start_time, end_time, text }] }
// with times in SECONDS. Run from cwd == the video dir (set by runWhisperBatch).
import { writeFile } 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);
function arg(flag) {
  const i = argv.indexOf(flag);
  return i < 0 ? undefined : argv[i + 1];
}

const out = arg("-o");
const audio = argv[argv.length - 1];
if (!out) {
  process.stderr.write(`[fake-chough] missing -o\n`);
  process.exit(2);
}

const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

// Videos whose dir (== video id) contains the SLOWOP marker emit chough-style
// progress output (audio header + █/░ bars + ETA) with real delays, so the
// per-operation progress bars and drain behaviour can be observed. Videos
// without the marker stay instant so the rest of the suite is fast.
const totalSec = 50;
if (process.cwd().toLowerCase().includes("slowop")) {
  process.stdout.write(`mode: local\n`);
  process.stdout.write(`audio: ${totalSec}.0s • chunks: 60s • format: json\n`);
  const width = 40;
  for (let step = 1; step <= 10; step += 1) {
    const filled = Math.round((step / 10) * width);
    const bar = "█".repeat(filled) + "░".repeat(width - filled);
    const etaSec = Math.max(0, Math.round(((10 - step) / 10) * 30));
    process.stdout.write(
      `${bar} ETA ${Math.floor(etaSec / 60)}m ${etaSec % 60}s\x1b[K\n`,
    );
    await sleep(700);
  }
}

const doc = {
  duration_seconds: totalSec,
  chunks: 2,
  text: `Synthetic chough output for ${audio} #1 Synthetic chough output for ${audio} #2`,
  chunk_data: [
    { start_time: 0, end_time: 5, text: `Synthetic chough output for ${audio} #1` },
    { start_time: 5, end_time: 10, text: `Synthetic chough output for ${audio} #2` },
  ],
};

// chough writes EXACTLY the -o path (no extension munging).
await writeFile(out, JSON.stringify(doc));
process.stdout.write(`Output: ${out}\n`);