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import * as React from 'react'
import {
  getRegisteredStyles,
  insertStyles,
  registerStyles
} from '@emotion/utils'
import { serializeStyles } from '@emotion/serialize'
import isDevelopment from '#is-development'
import { withEmotionCache } from './context'
import { ThemeContext } from './theming'
import { useInsertionEffectAlwaysWithSyncFallback } from '@emotion/use-insertion-effect-with-fallbacks'
import isBrowser from '#is-browser'

/*
type ClassNameArg =
  | string
  | boolean
  | { [key: string]: boolean }
  | Array
  | null
  | void
*/

let classnames = (args /*: Array */) /*: string */ => {
  let len = args.length
  let i = 0
  let cls = ''
  for (; i < len; i++) {
    let arg = args[i]
    if (arg == null) continue

    let toAdd
    switch (typeof arg) {
      case 'boolean':
        break
      case 'object': {
        if (Array.isArray(arg)) {
          toAdd = classnames(arg)
        } else {
          if (
            isDevelopment &&
            arg.styles !== undefined &&
            arg.name !== undefined
          ) {
            console.error(
              'You have passed styles created with `css` from `@emotion/react` package to the `cx`.\n' +
                '`cx` is meant to compose class names (strings) so you should convert those styles to a class name by passing them to the `css` received from  component.'
            )
          }
          toAdd = ''
          for (const k in arg) {
            if (arg[k] && k) {
              toAdd && (toAdd += ' ')
              toAdd += k
            }
          }
        }
        break
      }
      default: {
        toAdd = arg
      }
    }
    if (toAdd) {
      cls && (cls += ' ')
      cls += toAdd
    }
  }
  return cls
}
function merge(
  registered /*: Object */,
  css /*: (...args: Array) => string */,
  className /*: string */
) {
  const registeredStyles = []

  const rawClassName = getRegisteredStyles(
    registered,
    registeredStyles,
    className
  )

  if (registeredStyles.length < 2) {
    return className
  }
  return rawClassName + css(registeredStyles)
}

const Insertion = ({ cache, serializedArr }) => {
  let rules = useInsertionEffectAlwaysWithSyncFallback(() => {
    let rules = ''
    for (let i = 0; i < serializedArr.length; i++) {
      let res = insertStyles(cache, serializedArr[i], false)
      if (!isBrowser && res !== undefined) {
        rules += res
      }
    }
    if (!isBrowser) {
      return rules
    }
  })

  if (!isBrowser && rules.length !== 0) {
    return (