import { extname } from "path";

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

const video = args[0];
const labels = args[1];
const ext = extname(video);

const labels_contents = (await $`awk '{print $3, $4, $5}' < ${labels}`).stdout;

const FREQ = 48000;

const working_dir = "/tmp/dziurkacz";

const before_path = `${working_dir}/before${ext}`;
const after_path = `${working_dir}/after${ext}`;
const working_path = `${working_dir}/working${ext}`;
const vdlist = `${working_dir}/vdlist.txt`;

async function makeCut({ duration, start, end }) {
  await Promise.all([
    $`ffmpeg -i ${working_path} -to ${start} -c copy -an -y ${before_path}`,
    $`ffmpeg -ss ${end} -i ${working_path} -c copy -an -y ${after_path}`,
  ]);
  await Promise.all([
    $`echo file ${before_path} > ${vdlist}`,
    $`echo file ${after_path} >> ${vdlist}`,
  ]);
  await $`ffmpeg -f concat -safe 0 -i ${vdlist} -c copy -y ${working_path} `;
}

await $`mkdir -p ${working_dir}`;
await $`cp -f ${video} ${working_path}`;

const cuts = labels_contents
  .split(os.EOL)
  .slice(0, -1)
  .map((e) =>
    e
      .split(" ")
      .slice(1)
      .map((x) => parseFloat(x))
  )
  .map(([samples, start]) => ({
    duration: samples / FREQ,
    start,
    end: start + samples / FREQ,
  }));

// await makeCut(cuts[0]);
// await makeCut(cuts[1]);

for (const cut of cuts) {
  await makeCut(cut);
}

console.log(
  `Removed ${cuts
    .map((e) => e.duration)
    .reduce((a, b) => a + b, 0)
    .toFixed(3)}s from video`
);