'use strict'

module.exports = factory

var noop = Function.prototype
var own = {}.hasOwnProperty

// Handle values based on a property.
function factory(key, options) {
  var settings = options || {}

  function one(value) {
    var fn = one.invalid
    var handlers = one.handlers

    if (value && own.call(value, key)) {
      fn = own.call(handlers, value[key]) ? handlers[value[key]] : one.unknown
    }

    return (fn || noop).apply(this, arguments)
  }

  one.handlers = settings.handlers || {}
  one.invalid = settings.invalid
  one.unknown = settings.unknown

  return one
}