const { toString } = Object.prototype

export function is(val: unknown, type: string) {
  return toString.call(val) === `[object ${type}]`
}

export function isDef<T = unknown>(val?: T): val is T {
  return typeof val !== 'undefined'
}

export function isUnDef<T = unknown>(val?: T): val is T {
  return !isDef(val)
}

export function isNull(val: unknown): val is null {
  return val === null
}

export function isObject(val: any): val is Record<any, any> {
  return val !== null && is(val, 'Object')
}

export function isBoolean(val: unknown): val is boolean {
  return is(val, 'Boolean')
}

export function isString(val: unknown): val is string {
  return is(val, 'String')
}

export function isArray(val: any): val is any[] {
  return val && Array.isArray(val)
}

export function isNullOrUnDef(val: unknown): val is null | undefined {
  return isUnDef(val) || isNull(val)
}

export function isEmpty<T = unknown>(val: T): val is T {
  if (isArray(val) || isString(val)) {
    return val.length === 0
  }

  if (val instanceof Map || val instanceof Set) {
    return val.size === 0
  }

  if (isObject(val)) {
    return Object.keys(val).length === 0
  }

  return false
}

export function isMobile() {
  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)
}