import { Children, isValidElement, ReactNode, Ref } from 'react'

export function concat(prefix: string, ...suffix: string[]) {
  return [prefix, ...suffix].join('-')
}

export const isDev = process.env.NODE_ENV !== 'production'

/** 得到 ReactNode 中的文本 */
export function getText(node: ReactNode): string {
  return Children.toArray(node).map(child => {
    if (typeof child === 'string') {
      return child
    }
    if (typeof child === 'number') {
      return child + ''
    }
    if (isValidElement(child) && child.props) {
      return getText(child.props.children)
    }
    return ''
  }).join('')
}

/** 使用给定的值填充给定 ref，支持 ref object 或 callback ref */
export function fillRef<T>(ref: Ref<T>, value: T | null) {
  if (ref == null) return
  if (typeof ref === 'function') {
    ref(value)
    return
  }
  // ref.current 本来是 readonly 的
  (ref.current as T | null) = value
}

export function assert(predict: boolean | (() => boolean), message: string): void {
  if (typeof predict === 'boolean') {
    if (!predict) throw Error(message)
    return
  }

  if (!predict()) {
    throw Error(message)
  }
}

export function areArraysShallowEqual(arr1: any[], arr2: any[]) {
  if (arr1.length !== arr2.length) return false

  for (const index in arr1) {
    if (arr1[index] !== arr2[index]) {
      return false
    }
  }
  return true
}

let index = 0
export function getId() {
  return `icecream-${Date.now()}-${++index}`
}