const FUNC_ERROR_TEXT = 'Expected a function'
const NAN = 0 / 0
const nativeMax = Math.max
const nativeMin = Math.min
const reIsBinary = /^0b[01]+$/i
const reIsOctal = /^0o[0-7]+$/i
const reIsBadHex = /^[-+]0x[0-9a-f]+$/i
const freeParseInt = parseInt
const reTrim = /^\s+|\s+$/g
const symbolTag = '[object Symbol]'
const undefinedTag = '[object Undefined]'
const nullTag = '[object Null]'
//const symToStringTag = Symbol ? Symbol.toStringTag : undefined
const symToStringTag: typeof Symbol.toStringTag = Symbol
  ? Symbol.toStringTag
  : undefined!
const objectProto = Object.prototype
const hasOwnProperty = objectProto.hasOwnProperty
const nativeObjectToString = objectProto.toString

export function throttle(func: any, wait: any) {
  const leading = true
  const trailing = true

  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT)
  }
  return debounce(func, wait, {
    leading: leading,
    maxWait: wait,
    trailing: trailing,
  })
}

function isObject(value: any) {
  const type = typeof value
  return value != null && (type == 'object' || type == 'function')
}

function debounce(func: any, wait: any, options: any) {
  let lastArgs: any
  let lastThis: any
  let maxWait: any
  let result: any
  let timerId: any
  let lastCallTime: any
  let lastInvokeTime = 0
  let leading = false
  let maxing = false
  let trailing = true

  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT)
  }
  wait = toNumber(wait) || 0
  if (isObject(options)) {
    leading = !!options.leading
    maxing = 'maxWait' in options
    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait
    trailing = 'trailing' in options ? !!options.trailing : trailing
  }

  function invokeFunc(time: any) {
    const args = lastArgs
    const thisArg = lastThis

    lastArgs = lastThis = undefined
    lastInvokeTime = time
    result = func.apply(thisArg, args)
    return result
  }

  function leadingEdge(time: any) {
    lastInvokeTime = time
    timerId = setTimeout(timerExpired, wait)
    return leading ? invokeFunc(time) : result
  }

  function remainingWait(time: any) {
    const timeSinceLastCall = time - lastCallTime
    const timeSinceLastInvoke = time - lastInvokeTime
    const timeWaiting = wait - timeSinceLastCall

    return maxing
      ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
      : timeWaiting
  }

  function shouldInvoke(time: any) {
    const timeSinceLastCall = time - lastCallTime
    const timeSinceLastInvoke = time - lastInvokeTime
    return (
      lastCallTime === undefined ||
      timeSinceLastCall >= wait ||
      timeSinceLastCall < 0 ||
      (maxing && timeSinceLastInvoke >= maxWait)
    )
  }

  function timerExpired() {
    const time = Date.now()
    if (shouldInvoke(time)) {
      return trailingEdge(time)
    }
    timerId = setTimeout(timerExpired, remainingWait(time))
  }

  function trailingEdge(time: any) {
    timerId = undefined

    if (trailing && lastArgs) {
      return invokeFunc(time)
    }
    lastArgs = lastThis = undefined
    return result
  }

  function cancel() {
    if (timerId !== undefined) {
      clearTimeout(timerId)
    }
    lastInvokeTime = 0
    lastArgs = lastCallTime = lastThis = timerId = undefined
  }

  function flush() {
    return timerId === undefined ? result : trailingEdge(Date.now())
  }

  function debounced(this: any, ...args: any[]) {
    const time = Date.now()
    const isInvoking = shouldInvoke(time)

    lastArgs = args
    // eslint-disable-next-line @typescript-eslint/no-this-alias
    lastThis = this
    lastCallTime = time

    if (isInvoking) {
      if (timerId === undefined) {
        return leadingEdge(lastCallTime)
      }
      if (maxing) {
        clearTimeout(timerId)
        timerId = setTimeout(timerExpired, wait)
        return invokeFunc(lastCallTime)
      }
    }
    if (timerId === undefined) {
      timerId = setTimeout(timerExpired, wait)
    }
    return result
  }
  debounced.cancel = cancel
  debounced.flush = flush
  return debounced
}

function toNumber(value: any) {
  if (typeof value == 'number') {
    return value
  }
  if (isSymbol(value)) {
    return NAN
  }
  if (isObject(value)) {
    const other = typeof value.valueOf == 'function' ? value.valueOf() : value
    value = isObject(other) ? other + '' : other
  }
  if (typeof value != 'string') {
    return value === 0 ? value : +value
  }
  value = value.replace(reTrim, '')
  const isBinary = reIsBinary.test(value)
  return isBinary || reIsOctal.test(value)
    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
    : reIsBadHex.test(value)
    ? NAN
    : +value
}

function isSymbol(value: any) {
  return (
    typeof value == 'symbol' ||
    (isObjectLike(value) && baseGetTag(value) == symbolTag)
  )
}

function isObjectLike(value: any) {
  return value != null && typeof value == 'object'
}

function baseGetTag(value: any) {
  if (value == null) {
    return value === undefined ? undefinedTag : nullTag
  }
  return symToStringTag && symToStringTag in Object(value)
    ? getRawTag(value)
    : objectToString(value)
}

function getRawTag(value: any) {
  const isOwn = hasOwnProperty.call(value, symToStringTag)
  const tag = value[symToStringTag]
  const unmasked = true

  try {
    value[symToStringTag] = undefined
    const unmasked = true
  } catch (e) {
    console.log(e)
  }

  const result = nativeObjectToString.call(value)
  if (unmasked) {
    if (isOwn) {
      value[symToStringTag] = tag
    } else {
      delete value[symToStringTag]
    }
  }
  return result
}

function objectToString(value: any) {
  return nativeObjectToString.call(value)
}