#!/usr/bin/node

if (process.argv.length < 3 || process.argv.length > 4) {
    process.exit(0);
}

var f, fs = require('fs');

switch (process.argv[2]) {
case '--set-brightness':
    var value = process.argv[3];
    if (value !== '' + parseInt(value, 10))
	process.exit(0);
    value = Math.round(value / 101 * 48);
    fs.writeFileSync('/sys/class/backlight/intel_backlight/brightness', '' + value,{ encoding: 'utf8' });
    break;
case '--get-brightness':
    f = fs.readFileSync('/sys/class/backlight/intel_backlight/brightness', { encoding: 'utf8' });
    process.stdout.write('' + Math.round(parseInt(f, 10) * 101 / 48) + '\n');
    break;
case '--get-max-brightness':
    process.stdout.write('101\n');
}
process.exit(0);