var upperCase = require('upper-case')
var noCase = require('no-case')

/**
 * Camel case a string.
 *
 * @param  {string} value
 * @param  {string} [locale]
 * @return {string}
 */
module.exports = function (value, locale, mergeNumbers) {
  var result = noCase(value, locale)

  // Replace periods between numeric entities with an underscore.
  if (!mergeNumbers) {
    result = result.replace(/ (?=\d)/g, '_')
  }

  // Replace spaces between words with an upper cased character.
  return result.replace(/ (.)/g, function (m, $1) {
    return upperCase($1, locale)
  })
}