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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}