import { baseGetTag } from './_baseGetTag'
import { toSource } from './_toSource'

/** `Object#toString` result references. */
const mapTag = '[object Map]',
  objectTag = '[object Object]',
  promiseTag = '[object Promise]',
  setTag = '[object Set]',
  weakMapTag = '[object WeakMap]'

const dataViewTag = '[object DataView]'

/** Used to detect maps, sets, and weakmaps. */
const dataViewCtorString = toSource(DataView),
  mapCtorString = toSource(Map),
  promiseCtorString = toSource(Promise),
  setCtorString = toSource(Set),
  weakMapCtorString = toSource(WeakMap)

/**
 * Gets the `toStringTag` of `value`.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {string} Returns the `toStringTag`.
 */
let getTag = baseGetTag

// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
if (
  (DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
  (Map && getTag(new Map()) != mapTag) ||
  (Promise && getTag(Promise.resolve()) != promiseTag) ||
  (Set && getTag(new Set()) != setTag) ||
  (WeakMap && getTag(new WeakMap()) != weakMapTag)
) {
  getTag = function (value: any) {
    const result = baseGetTag(value)
    const Ctor = result == objectTag ? value.constructor : undefined
    const ctorString = Ctor ? toSource(Ctor) : ''

    if (ctorString) {
      switch (ctorString) {
        case dataViewCtorString:
          return dataViewTag
        case mapCtorString:
          return mapTag
        case promiseCtorString:
          return promiseTag
        case setCtorString:
          return setTag
        case weakMapCtorString:
          return weakMapTag
      }
    }
    return result
  }
}

export { getTag }