(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global.numerify = factory());
}(this, (function () { 'use strict';

  var ABBR = {
    th: 3,
    mi: 6,
    bi: 9,
    tr: 12
  };

  var DEFAULT_OPTIONS = {
    zeroFormat: null,
    nullFormat: null,
    defaultFormat: '0,0',
    scalePercentBy100: true,
    abbrLabel: {
      th: 'k',
      mi: 'm',
      bi: 'b',
      tr: 't'
    }
  };

  var TRILLION = 1e12;
  var BILLION = 1e9;
  var MILLION = 1e6;
  var THOUSAND = 1e3;

  function numIsNaN(value) {
    return typeof value === 'number' && isNaN(value);
  }

  function toFixed(value, maxDecimals, roundingFunction, optionals) {
    var splitValue = value.toString().split('.');
    var minDecimals = maxDecimals - (optionals || 0);
    var boundedPrecision = splitValue.length === 2 ? Math.min(Math.max(splitValue[1].length, minDecimals), maxDecimals) : minDecimals;
    var power = Math.pow(10, boundedPrecision);
    var output = (roundingFunction(value + 'e+' + boundedPrecision) / power).toFixed(boundedPrecision);

    if (optionals > maxDecimals - boundedPrecision) {
      var optionalsRegExp = new RegExp('\\.?0{1,' + (optionals - (maxDecimals - boundedPrecision)) + '}$');
      output = output.replace(optionalsRegExp, '');
    }

    return output;
  }

  function numberToFormat(options, value, format, roundingFunction) {
    var abs = Math.abs(value);
    var negP = false;
    var optDec = false;
    var abbr = '';
    var decimal = '';
    var neg = false;
    var abbrForce = void 0;
    var signed = void 0;
    format = format || '';

    value = value || 0;

    if (~format.indexOf('(')) {
      negP = true;
      format = format.replace(/[(|)]/g, '');
    } else if (~format.indexOf('+') || ~format.indexOf('-')) {
      signed = ~format.indexOf('+') ? format.indexOf('+') : value < 0 ? format.indexOf('-') : -1;
      format = format.replace(/[+|-]/g, '');
    }
    if (~format.indexOf('a')) {
      abbrForce = format.match(/a(k|m|b|t)?/);

      abbrForce = abbrForce ? abbrForce[1] : false;

      if (~format.indexOf(' a')) abbr = ' ';
      format = format.replace(new RegExp(abbr + 'a[kmbt]?'), '');

      if (abs >= TRILLION && !abbrForce || abbrForce === 't') {
        abbr += options.abbrLabel.tr;
        value = value / TRILLION;
      } else if (abs < TRILLION && abs >= BILLION && !abbrForce || abbrForce === 'b') {
        abbr += options.abbrLabel.bi;
        value = value / BILLION;
      } else if (abs < BILLION && abs >= MILLION && !abbrForce || abbrForce === 'm') {
        abbr += options.abbrLabel.mi;
        value = value / MILLION;
      } else if (abs < MILLION && abs >= THOUSAND && !abbrForce || abbrForce === 'k') {
        abbr += options.abbrLabel.th;
        value = value / THOUSAND;
      }
    }
    if (~format.indexOf('[.]')) {
      optDec = true;
      format = format.replace('[.]', '.');
    }
    var int = value.toString().split('.')[0];
    var precision = format.split('.')[1];
    var thousands = format.indexOf(',');
    var leadingCount = (format.split('.')[0].split(',')[0].match(/0/g) || []).length;

    if (precision) {
      if (~precision.indexOf('[')) {
        precision = precision.replace(']', '');
        precision = precision.split('[');
        decimal = toFixed(value, precision[0].length + precision[1].length, roundingFunction, precision[1].length);
      } else {
        decimal = toFixed(value, precision.length, roundingFunction);
      }

      int = decimal.split('.')[0];
      decimal = ~decimal.indexOf('.') ? '.' + decimal.split('.')[1] : '';
      if (optDec && +decimal.slice(1) === 0) decimal = '';
    } else {
      int = toFixed(value, 0, roundingFunction);
    }
    if (abbr && !abbrForce && +int >= 1000 && abbr !== ABBR.trillion) {
      int = '' + +int / 1000;
      abbr = ABBR.million;
    }
    if (~int.indexOf('-')) {
      int = int.slice(1);
      neg = true;
    }
    if (int.length < leadingCount) {
      for (var i = leadingCount - int.length; i > 0; i--) {
        int = '0' + int;
      }
    }

    if (thousands > -1) {
      int = int.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1' + ',');
    }

    if (!format.indexOf('.')) int = '';

    var output = int + decimal + (abbr || '');

    if (negP) {
      output = (negP && neg ? '(' : '') + output + (negP && neg ? ')' : '');
    } else {
      if (signed >= 0) {
        output = signed === 0 ? (neg ? '-' : '+') + output : output + (neg ? '-' : '+');
      } else if (neg) {
        output = '-' + output;
      }
    }

    return output;
  }

  function extend(target, sub) {
    Object.keys(sub).forEach(function (key) {
      target[key] = sub[key];
    });
  }

  var numerifyPercent = {
    regexp: /%/,
    format: function format(value, formatType, roundingFunction, numerify) {
      var space = ~formatType.indexOf(' %') ? ' ' : '';
      var output = void 0;

      if (numerify.options.scalePercentBy100) value = value * 100;

      formatType = formatType.replace(/\s?%/, '');

      output = numerify._numberToFormat(value, formatType, roundingFunction);

      if (~output.indexOf(')')) {
        output = output.split('');
        output.splice(-1, 0, space + '%');
        output = output.join('');
      } else {
        output = output + space + '%';
      }

      return output;
    }
  };

  var options = {};
  var formats = {};

  extend(options, DEFAULT_OPTIONS);

  function format(value, formatType, roundingFunction) {
    formatType = formatType || options.defaultFormat;
    roundingFunction = roundingFunction || Math.round;
    var output = void 0;
    var formatFunction = void 0;

    if (value === 0 && options.zeroFormat !== null) {
      output = options.zeroFormat;
    } else if (value === null && options.nullFormat !== null) {
      output = options.nullFormat;
    } else {
      for (var kind in formats) {
        if (formats[kind] && formatType.match(formats[kind].regexp)) {
          formatFunction = formats[kind].format;
          break;
        }
      }
      formatFunction = formatFunction || numberToFormat.bind(null, options);
      output = formatFunction(value, formatType, roundingFunction, numerify);
    }

    return output;
  }

  function numerify(input, formatType, roundingFunction) {
    var value = void 0;

    if (input === 0 || typeof input === 'undefined') {
      value = 0;
    } else if (input === null || numIsNaN(input)) {
      value = null;
    } else if (typeof input === 'string') {
      if (options.zeroFormat && input === options.zeroFormat) {
        value = 0;
      } else if (options.nullFormat && input === options.nullFormat || !input.replace(/[^0-9]+/g, '').length) {
        value = null;
      } else {
        value = +input;
      }
    } else {
      value = +input || null;
    }

    return format(value, formatType, roundingFunction);
  }

  numerify.options = options;
  numerify._numberToFormat = numberToFormat.bind(null, options);
  numerify.register = function (name, format) {
    formats[name] = format;
  };
  numerify.unregister = function (name) {
    formats[name] = null;
  };
  numerify.setOptions = function (opts) {
    extend(options, opts);
  };
  numerify.reset = function () {
    extend(options, DEFAULT_OPTIONS);
  };

  numerify.register('percentage', numerifyPercent);

  return numerify;

})));