// https://github.com/lodash/lodash/blob/master/toArray.js
import { isStringPrimitive } from '../../primitive/string/isStringPrimitive'
import { isIterator } from '../../iterator/check/isIterator'
import { isNil } from '../../primitive/nil'
import { isMap, isSet } from '../../collection'
import isArray from '../check/isArray'
import ArrayFrom from './toArrayFrom'

/**
 * @desc anything into an array
 * @memberOf cast
 * @name toArr
 * @alias toArray
 *
 * @sig * => Array
 * @since 0.0.1
 *
 * @param  {any} ar turn this into an array
 * @return {Array} anything into an array
 *
 * @tests deps/to-arr
 * @types deps
 *
 * {@link https://github.com/jashkenas/underscore/blob/master/underscore.js#L465 underscore-to-arr}
 * @see {@link underscore-to-arr}
 *
 * @example
 *
 *   toarr([])
 *   //=> []
 *
 *   toarr('')
 *   //=> ['']
 *
 *   toarr('1,2')
 *   //=> ['1', '2']
 *
 *   toarr('1,2')
 *   //=> ['1', '2']
 *
 *   const map = new Map()
 *   map.set('eh', true)
 *   const arr = toarr(map.entries())
 *   //=> ['eh', true]
 *
 *   const set = new Set()
 *   set.add('eh')
 *   set.add(true)
 *   const arr = toarr(map.entries())
 *   //=> ['eh', true]
 *
 *   toarr('').concat(toarr(false)).concat(toarr(null))
 *   //=> ['', false, null]
 *
 */
const toArray = <Value = Map<any, any> | { [key: string]: any }>(
  ar: Value
): Array<Value> | string[] => {
  // @NOTE: !'' === true
  if (isStringPrimitive(ar)) return ar.includes(',') ? ar.split(',') : [ar]
  else if (isNil(ar)) return []
  else if (isArray(ar)) {
    // else if (!ar) return [ar]
    return ar
  } else if (isSet(ar) || isMap(ar) || (ar as any).values) {
    // hasIn(ar, 'values')
    /**
     * @desc when using `new Set().values`... no forEach o.o
     * @NOTE .values is also on `Object`...
     */
    return ArrayFrom((ar as any).values(ar))
  } else if (isIterator(ar)) return ArrayFrom(ar)
  else return [ar]
}

export default toArray