import { filter, toArray } from "lodash"
import ISBLANK from "./ISBLANK"

/**
 * Checks whether all values passed in exist.
 * 
 * View Documentation - https://learn.fulcrumapp.com/dev/expressions/reference/exists/
 * @param args (Any|Array): list of items to check
 * @returns boolean value indicating whether all values exist
 * @example
 * EXISTS(1, 3, 7, null) // returns false
 */

export default function EXISTS(arg: any, ...args: any[]): arg is number | boolean | string | object
export default function EXISTS(...args: any[]): boolean
export default function EXISTS(...args: any[]): boolean {
  const valuesAreBlank: boolean[] = toArray(args).map(ISBLANK)
  const totalBlankValues: boolean[] = filter(valuesAreBlank)

  return totalBlankValues.length === 0
}