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import {_isArray} from './_internals/_isArray'
// recursively traverse the given spec object to find the highest arity functionfunction __findHighestArity(spec, max = 0) {  for (const key in spec) {    if (spec.hasOwnProperty(key) === false || key === 'constructor') continue
    if (typeof spec[key] === 'object') {      max = Math.max(max, __findHighestArity(spec[key]))    }
    if (typeof spec[key] === 'function') {      max = Math.max(max, spec[key].length)    }  }
  return max}
function __filterUndefined() {  const defined = []  let i = 0  const l = arguments.length  while (i < l) {    if (typeof arguments[i] === 'undefined') break    defined[i] = arguments[i]    i++  }
  return defined}
function __applySpecWithArity(spec, arity, cache) {  const remaining = arity - cache.length
  if (remaining === 1)    return x =>      __applySpecWithArity(spec, arity, __filterUndefined(...cache, x))  if (remaining === 2)    return (x, y) =>      __applySpecWithArity(spec, arity, __filterUndefined(...cache, x, y))  if (remaining === 3)    return (x, y, z) =>      __applySpecWithArity(spec, arity, __filterUndefined(...cache, x, y, z))  if (remaining === 4)    return (x, y, z, a) =>      __applySpecWithArity(        spec,        arity,        __filterUndefined(...cache, x, y, z, a)      )  if (remaining > 4)    return (...args) =>      __applySpecWithArity(spec, arity, __filterUndefined(...cache, ...args))
  // handle spec as Array  if (_isArray(spec)) {    const ret = []    let i = 0    const l = spec.length    for (; i < l; i++) {      // handle recursive spec inside array      if (typeof spec[i] === 'object' || _isArray(spec[i])) {        ret[i] = __applySpecWithArity(spec[i], arity, cache)      }      // apply spec to the key      if (typeof spec[i] === 'function') {        ret[i] = spec[i](...cache)      }    }
    return ret  }
  // handle spec as Object  const ret = {}  // apply callbacks to each property in the spec object  for (const key in spec) {    if (spec.hasOwnProperty(key) === false || key === 'constructor') continue
    // apply the spec recursively    if (typeof spec[key] === 'object') {      ret[key] = __applySpecWithArity(spec[key], arity, cache)      continue    }
    // apply spec to the key    if (typeof spec[key] === 'function') {      ret[key] = spec[key](...cache)    }  }
  return ret}
export function applySpec(spec, ...args) {  // get the highest arity spec function, cache the result and pass to __applySpecWithArity  const arity = __findHighestArity(spec)
  if (arity === 0) {    return () => ({})  }  const toReturn = __applySpecWithArity(spec, arity, args)
  return toReturn}