import React, { ReactNode } from 'react'

export const getId = () => {
  return Math.random().toString(32).slice(2, 10)
}

export const hasChild = (children: ReactNode | undefined, child: React.ElementType): boolean => {
  const types = React.Children.map(children, item => {
    if (!React.isValidElement(item)) return null
    return item.type
  })

  return (types || []).includes(child)
}

export const pickChild = (
  children: ReactNode | undefined,
  targetChild: React.ElementType,
): [ReactNode | undefined, ReactNode | undefined] => {
  let target: ReactNode[] = []
  const withoutTargetChildren = React.Children.map(children, item => {
    if (!React.isValidElement(item)) return item
    if (item.type === targetChild) {
      target.push(item)
      return null
    }
    return item
  })

  const targetChildren = target.length >= 0 ? target : undefined

  return [withoutTargetChildren, targetChildren]
}

export const pickChildByProps = (
  children: ReactNode | undefined,
  key: string,
  value: any,
): [ReactNode | undefined, ReactNode | undefined] => {
  let target: ReactNode[] = []
  const withoutPropChildren = React.Children.map(children, item => {
    if (!React.isValidElement(item)) return null
    if (!item.props) return item
    if (item.props[key] === value) {
      target.push(item)
      return null
    }
    return item
  })

  const targetChildren = target.length >= 0 ? target : undefined

  return [withoutPropChildren, targetChildren]
}

export const pickChildrenFirst = (children: ReactNode | undefined): ReactNode | undefined => {
  return React.Children.toArray(children)[0]
}

export const setChildrenProps = (
  children: ReactNode | undefined,
  props: object = {},
  targetComponents: Array<React.ElementType> = [],
): ReactNode | undefined => {
  if (React.Children.count(children) === 0) return []
  const allowAll = targetComponents.length === 0
  const clone = (child: React.ReactElement, props = {}) => React.cloneElement(child, props)

  return React.Children.map(children, item => {
    if (!React.isValidElement(item)) return item
    if (allowAll) return clone(item, props)

    const isAllowed = targetComponents.find(child => child === item.type)
    if (isAllowed) return clone(item, props)
    return item
  })
}

export const setChildrenIndex = (
  children: ReactNode | undefined,
  targetComponents: Array<React.ElementType> = [],
): ReactNode | undefined => {
  if (React.Children.count(children) === 0) return []
  const allowAll = targetComponents.length === 0
  const clone = (child: React.ReactElement, props = {}) => React.cloneElement(child, props)
  let index = 0

  return React.Children.map(children, item => {
    if (!React.isValidElement(item)) return item
    index = index + 1
    if (allowAll) return clone(item, { index })

    const isAllowed = targetComponents.find(child => child === item.type)
    if (isAllowed) return clone(item, { index })
    index = index - 1
    return item
  })
}

export const getReactNode = (node?: React.ReactNode | (() => React.ReactNode)): React.ReactNode => {
  if (!node) return null

  if (typeof node !== 'function') return node
  return (node as () => React.ReactNode)()
}