import { type PhpArrayLike, type PhpAssoc, toPhpArrayObject } from '../_helpers/_phpTypes.ts'

export function array_intersect_key<TValue>(
  arr1: PhpArrayLike<TValue>,
  ...arrays: Array<PhpArrayLike<TValue>>
): PhpAssoc<TValue> {
  //  discuss at: https://locutus.io/php/array_intersect_key/
  // original by: Brett Zamir (https://brett-zamir.me)
  //      note 1: These only output associative arrays (would need to be
  //      note 1: all numeric and counting from zero to be numeric)
  //   example 1: var $array1 = {a: 'green', b: 'brown', c: 'blue', 0: 'red'}
  //   example 1: var $array2 = {a: 'green', 0: 'yellow', 1: 'red'}
  //   example 1: array_intersect_key($array1, $array2)
  //   returns 1: {0: 'red', a: 'green'}

  const retArr: PhpAssoc<TValue> = {}
  if (arrays.length < 1) {
    return retArr
  }

  const arr1Object = toPhpArrayObject<TValue>(arr1)
  const keySets = arrays.map((nextArray) => new Set(Object.keys(toPhpArrayObject<TValue>(nextArray))))

  for (const [k1, arr1Value] of Object.entries(arr1Object)) {
    if (keySets.every((keys) => keys.has(k1))) {
      retArr[k1] = arr1Value
    }
  }

  return retArr
}