/**
 * Export.
 */

module.exports = toNoCase

/**
 * Test whether a string is camel-case.
 */

var hasSpace = /\s/
var hasSeparator = /(_|-|\.|:)/
var hasCamel = /([a-z][A-Z]|[A-Z][a-z])/

/**
 * Remove any starting case from a `string`, like camel or snake, but keep
 * spaces and punctuation that may be important otherwise.
 *
 * @param {String} string
 * @return {String}
 */

function toNoCase(string) {
  if (hasSpace.test(string)) return string.toLowerCase()
  if (hasSeparator.test(string)) return (unseparate(string) || string).toLowerCase()
  if (hasCamel.test(string)) return uncamelize(string).toLowerCase()
  return string.toLowerCase()
}

/**
 * Separator splitter.
 */

var separatorSplitter = /[\W_]+(.|$)/g

/**
 * Un-separate a `string`.
 *
 * @param {String} string
 * @return {String}
 */

function unseparate(string) {
  return string.replace(separatorSplitter, function (m, next) {
    return next ? ' ' + next : ''
  })
}

/**
 * Camelcase splitter.
 */

var camelSplitter = /(.)([A-Z]+)/g

/**
 * Un-camelcase a `string`.
 *
 * @param {String} string
 * @return {String}
 */

function uncamelize(string) {
  return string.replace(camelSplitter, function (m, previous, uppers) {
    return previous + ' ' + uppers.toLowerCase().split('').join(' ')
  })
}