#!/usr/bin/env node

'use strict';

const gpmfExtract = require('gpmf-extract');
const goproTelemetry = require(`gopro-telemetry`);
const fs = require('fs');
const minimist = require('minimist');
const _ = require('lodash');

async function main(options) {
  const res = await gpmfExtract(bufferAppender(options.input, 10 * 1024 * 1024));

  function bufferAppender(path, chunkSize) {
    return function (mp4boxFile) {
      var stream = fs.createReadStream(path, { highWaterMark: chunkSize });
      var bytesRead = 0;
      stream.on('end', () => {
        mp4boxFile.flush();
      });
      stream.on('data', chunk => {
        var arrayBuffer = new Uint8Array(chunk).buffer;
        arrayBuffer.fileStart = bytesRead;
        mp4boxFile.appendBuffer(arrayBuffer);
        bytesRead += chunk.length;
      });
      stream.resume();
    };
  }

  goproTelemetry(res, _.omit(options, ['_', 'input', 'output']), telemetryData => {
    if (!_.isString(telemetryData)) {
      telemetryData = JSON.stringify(telemetryData);
    }
    fs.writeFileSync(options.output, telemetryData);
  });

}

main(minimist(process.argv.slice(2)));