var fs = require("fs");
var path = require("path");
var filetree = {};

const util = require("util");
const runInTerminal = util.promisify(require("child_process").exec);

const limitDecimalsWithRounding = (value, maxDecimals = 2) => {
  const amount = parseFloat(value);
  const power = 10 ** maxDecimals;
  return Math.round(amount * power) / power;
};

var walkDirectory = async function (location, obj = {}, untilNow = __dirname) {
  var dir = fs.readdirSync(location);
  for (var i = 0; i < dir.length; i++) {
    var name = dir[i];
    var target = location + "/" + name;

    var stats = fs.statSync(target);
    if (stats.isFile()) {
      if (name.slice(-5).includes(".")) {
        // obj[name.slice(0, -3)] = require(target);
        const currentFilePath = path.join(untilNow, name);
        const isVideo = currentFilePath.endsWith(".mp4");
        if (!isVideo) false;
        const op = !isVideo
          ? await runInTerminal(`du -h "${currentFilePath}"`)
          : await runInTerminal(
              `ffprobe "${currentFilePath}" -show_entries format=duration -v quiet -of csv="p=0";`
            );
        const { stdout, stderr } = op;
        // console.log({ stdout, stderr });

        const usefulOp = isVideo
          ? Math.round(
              1e3 * limitDecimalsWithRounding(stdout.split("\n").at(0), 4)
            )
          : limitDecimalsWithRounding(stdout.split("\t").at(0), 4);

        obj[name] = stderr ? usefulOp : null;
      }
    } else if (stats.isDirectory()) {
      obj[name] = {};
      await walkDirectory(target, obj[name], path.join(untilNow, name));
    }
  }
};

// walkDirectory(".", filetree).then(() => console.log(filetree));

module.exports = {
  /**
   * @returns {Object}
   */
  async getVideoFilesTreeAsObject(location = ".") {
    const retVal = await walkDirectory(location, {}, location);
    return retVal;
  },
};