type Fetch = typeof fetch

export const resolveFetch = (customFetch?: Fetch): Fetch => {
  if (customFetch) {
    return (...args) => customFetch(...args)
  }
  return (...args) => fetch(...args)
}

export const resolveResponse = (): typeof Response => {
  return Response
}

export const recursiveToCamel = (item: Record<string, any>): unknown => {
  if (Array.isArray(item)) {
    return item.map((el) => recursiveToCamel(el))
  } else if (typeof item === 'function' || item !== Object(item)) {
    return item
  }

  const result: Record<string, any> = {}
  Object.entries(item).forEach(([key, value]) => {
    const newKey = key.replace(/([-_][a-z])/gi, (c) => c.toUpperCase().replace(/[-_]/g, ''))
    result[newKey] = recursiveToCamel(value)
  })

  return result
}

/**
 * Determine if input is a plain object
 * An object is plain if it's created by either {}, new Object(), or Object.create(null)
 * source: https://github.com/sindresorhus/is-plain-obj
 */
export const isPlainObject = (value: object): boolean => {
  if (typeof value !== 'object' || value === null) {
    return false
  }

  const prototype = Object.getPrototypeOf(value)
  return (
    (prototype === null ||
      prototype === Object.prototype ||
      Object.getPrototypeOf(prototype) === null) &&
    !(Symbol.toStringTag in value) &&
    !(Symbol.iterator in value)
  )
}