import { isWhatsapp } from '@botonic/core'
import { useContext } from 'react'

import { RequestContext } from '../../contexts'
import { truncateText } from '../../util'
import { Button } from '../button/index'
import { COMPONENT_DISPLAY_NAMES } from '../constants'
import { MultichannelContext } from './multichannel-context'
import { WHATSAPP_MAX_BUTTON_CHARS } from './whatsapp/constants'

export const MultichannelButton = props => {
  const requestContext = useContext(RequestContext)
  const multichannelContext = useContext(MultichannelContext)

  const hasUrl = () => Boolean(props.url)

  const hasPath = () => Boolean(props.path)

  const hasPayload = () => Boolean(props.payload)

  const hasPostback = () => hasPath() || hasPayload()

  const hasWebview = () => Boolean(props.webview)

  const getUrl = () => props.url
  const _getWebview = () => props.webview

  const increaseCurrentIndex = () => {
    if (typeof multichannelContext.currentIndex === 'number') {
      multichannelContext.currentIndex += 1
    } else if (typeof multichannelContext.currentIndex === 'string') {
      const lastChar = multichannelContext.currentIndex.charCodeAt(
        multichannelContext.currentIndex.length - 1
      )
      multichannelContext.currentIndex = String.fromCharCode(lastChar + 1)
    }
  }

  const formatIndex = index => {
    const boldIndex = multichannelContext.boldIndex ?? false
    return boldIndex ? `*${index}*` : index
  }

  const getText = () => {
    let text = props.children
    const newline = props.newline || ''
    const separator = multichannelContext.indexSeparator || ' '
    const index = multichannelContext.currentIndex
      ? `${formatIndex(multichannelContext.currentIndex + separator)} `
      : ''
    if (hasPostback()) {
      text = `${newline}${index}${text}`
    } else if (hasUrl()) {
      text = `${newline}- ${text}`
    }
    return text
  }

  if (isWhatsapp(requestContext.session)) {
    const asText = props.asText ?? true
    if (asText) {
      if (hasUrl()) {
        return `${getText()}: ${getUrl()}`
      } else if (hasPath() || hasPayload()) {
        const text = getText()
        increaseCurrentIndex()
        return `${text}`
      } else if (hasWebview()) {
        return <Button {...props}>{getText()}</Button>
      }
    }
    return (
      <Button {...props}>
        {truncateText(props.children, WHATSAPP_MAX_BUTTON_CHARS)}
      </Button>
    )
  }
  return <Button {...props}>{props.children}</Button>
}

MultichannelButton.displayName = COMPONENT_DISPLAY_NAMES.MultichannelButton