const { NotImplementedError } = require('../extensions/index.js');

const MODERN_ACTIVITY = 15;
const HALF_LIFE_PERIOD = 5730;

/**
 * Determine the age of archeological find by using
 * given MODERN_ACTIVITY and HALF_LIFE_PERIOD values
 *
 * @param {String} sampleActivity string representation of current activity
 * @return {Number | Boolean} calculated age in years or false
 * in case of incorrect sampleActivity
 *
 * @example
 *
 * dateSample('1') => 22387
 * dateSample('WOOT!') => false
 *
 */
function dateSample( sampleActivity ) {
 // throw new NotImplementedError('Not implemented');

  if (isNaN(sampleActivity) || typeof sampleActivity !=='string' || sampleActivity >=15 ||  sampleActivity <= 0)
  {return false
  }else{ return Math.ceil( Math.log(MODERN_ACTIVITY / parseFloat(sampleActivity)) / (0.693 / HALF_LIFE_PERIOD))
  }
}

module.exports = {
  dateSample
};