import { useEffect, useRef } from 'react'
import { CAPTCHA_ENABLED, TURNSTILE_SITE_KEY } from '../config/captcha'

const TURNSTILE_SCRIPT_ID = 'cf-turnstile-script'
const TURNSTILE_SCRIPT_URL =
  'https://challenges.cloudflare.com/turnstile/v0/api.js?render=explicit'

export default function Captcha({ onToken }) {
  const containerRef = useRef(null)
  const widgetIdRef = useRef(null)

  useEffect(() => {
    if (!CAPTCHA_ENABLED || !TURNSTILE_SITE_KEY || !containerRef.current) {
      return
    }

    let cancelled = false

    const renderWidget = () => {
      if (
        cancelled ||
        !containerRef.current ||
        !window.turnstile
      ) {
        return
      }

      if (widgetIdRef.current !== null) {
        try {
          window.turnstile.remove(widgetIdRef.current)
        } catch {
          // Widget déjà supprimé
        }

        widgetIdRef.current = null
      }

      containerRef.current.innerHTML = ''

      window.turnstile.ready(() => {
        if (
          cancelled ||
          !containerRef.current ||
          !window.turnstile
        ) {
          return
        }

        widgetIdRef.current = window.turnstile.render(
          containerRef.current,
          {
            sitekey: TURNSTILE_SITE_KEY,
            language: 'fr',
            size: 'flexible',
            appearance: 'always',

            callback: (token) => {
              if (!cancelled) {
                onToken(token)
              }
            },

            'expired-callback': () => {
              if (!cancelled) {
                onToken('')
              }
            },

            'error-callback': () => {
              if (!cancelled) {
                onToken('')
              }
            },
          }
        )
      })
    }

    const existingScript = document.getElementById(
      TURNSTILE_SCRIPT_ID
    )

    if (window.turnstile) {
      renderWidget()
    } else if (existingScript) {
      existingScript.addEventListener('load', renderWidget, {
        once: true,
      })
    } else {
      const script = document.createElement('script')

      script.id = TURNSTILE_SCRIPT_ID
      script.src = TURNSTILE_SCRIPT_URL
      script.async = true
      script.defer = true

      script.addEventListener('load', renderWidget, {
        once: true,
      })

      document.head.appendChild(script)
    }

    return () => {
      cancelled = true

      if (
        widgetIdRef.current !== null &&
        window.turnstile
      ) {
        try {
          window.turnstile.remove(widgetIdRef.current)
        } catch {
          // Widget déjà supprimé
        }
      }

      widgetIdRef.current = null

      if (containerRef.current) {
        containerRef.current.innerHTML = ''
      }
    }
  }, [onToken])

  if (!CAPTCHA_ENABLED || !TURNSTILE_SITE_KEY) {
    return null
  }

  return (
    <div
      ref={containerRef}
      id="turnstile-captcha"
      className="w-full min-h-[65px] flex justify-center"
    />
  )
}