declare var module: any;

/**
 * Format a number as a percentage
 * @param  {Number} num       Number to format as a percent
 * @param  {Number} precision Precision of the decimal
 * @return {String}           Formatted perentage
 */
var BytediffFormatter, FormatPercent;

FormatPercent = function(num, precision) {
  return (num * 100).toFixed(precision);
};


/**
 * Formatter for bytediff to display the size changes after processing
 * @param  {Object} data - byte data
 * @return {String}      Difference in bytes, formatted
 */

BytediffFormatter = function(data) {
  var difference;
  difference = data.savings > 0 ? ' smaller.' : ' larger.';
  return data.fileName
  + ' went from '
  + (data.startSize / 1000).toFixed(2)
  + ' kB to ' + (data.endSize / 1000).toFixed(2)
  + ' kB and is ' + FormatPercent(1 - data.percent, 2)
  + '%' + difference;
};


module.exports = {
  bytediffFormatter: BytediffFormatter,
  formatPercent: FormatPercent
};