import { randomUUID } from 'crypto'
import { useCallback, useRef, useState } from 'react'
import type { TranscriptShareResponse } from './TranscriptSharePrompt.js'
import type { FeedbackSurveyResponse } from './utils.js'

type SurveyState =
  | 'closed'
  | 'open'
  | 'thanks'
  | 'transcript_prompt'
  | 'submitting'
  | 'submitted'

type UseSurveyStateOptions = {
  hideThanksAfterMs: number
  onOpen: (appearanceId: string) => void | Promise<void>
  onSelect: (
    appearanceId: string,
    selected: FeedbackSurveyResponse,
  ) => void | Promise<void>
  shouldShowTranscriptPrompt?: (selected: FeedbackSurveyResponse) => boolean
  onTranscriptPromptShown?: (
    appearanceId: string,
    surveyResponse: FeedbackSurveyResponse,
  ) => void
  onTranscriptSelect?: (
    appearanceId: string,
    selected: TranscriptShareResponse,
    surveyResponse: FeedbackSurveyResponse | null,
  ) => boolean | Promise<boolean>
}

export function useSurveyState({
  hideThanksAfterMs,
  onOpen,
  onSelect,
  shouldShowTranscriptPrompt,
  onTranscriptPromptShown,
  onTranscriptSelect,
}: UseSurveyStateOptions): {
  state: SurveyState
  lastResponse: FeedbackSurveyResponse | null
  open: () => void
  handleSelect: (selected: FeedbackSurveyResponse) => boolean
  handleTranscriptSelect: (selected: TranscriptShareResponse) => void
} {
  const [state, setState] = useState<SurveyState>('closed')
  const [lastResponse, setLastResponse] =
    useState<FeedbackSurveyResponse | null>(null)
  const appearanceId = useRef(randomUUID())
  const lastResponseRef = useRef<FeedbackSurveyResponse | null>(null)

  const showThanksThenClose = useCallback(() => {
    setState('thanks')
    setTimeout(
      (setState, setLastResponse) => {
        setState('closed')
        setLastResponse(null)
      },
      hideThanksAfterMs,
      setState,
      setLastResponse,
    )
  }, [hideThanksAfterMs])

  const showSubmittedThenClose = useCallback(() => {
    setState('submitted')
    setTimeout(setState, hideThanksAfterMs, 'closed')
  }, [hideThanksAfterMs])

  const open = useCallback(() => {
    if (state !== 'closed') {
      return
    }
    setState('open')
    appearanceId.current = randomUUID()
    void onOpen(appearanceId.current)
  }, [state, onOpen])

  const handleSelect = useCallback(
    (selected: FeedbackSurveyResponse): boolean => {
      setLastResponse(selected)
      lastResponseRef.current = selected
      // Always fire the survey response event first
      void onSelect(appearanceId.current, selected)

      if (selected === 'dismissed') {
        setState('closed')
        setLastResponse(null)
      } else if (shouldShowTranscriptPrompt?.(selected)) {
        setState('transcript_prompt')
        onTranscriptPromptShown?.(appearanceId.current, selected)
        return true
      } else {
        showThanksThenClose()
      }
      return false
    },
    [
      showThanksThenClose,
      onSelect,
      shouldShowTranscriptPrompt,
      onTranscriptPromptShown,
    ],
  )

  const handleTranscriptSelect = useCallback(
    (selected: TranscriptShareResponse) => {
      switch (selected) {
        case 'yes':
          setState('submitting')
          void (async () => {
            try {
              const success = await onTranscriptSelect?.(
                appearanceId.current,
                selected,
                lastResponseRef.current,
              )
              if (success) {
                showSubmittedThenClose()
              } else {
                showThanksThenClose()
              }
            } catch {
              showThanksThenClose()
            }
          })()
          break
        case 'no':
        case 'dont_ask_again':
          void onTranscriptSelect?.(
            appearanceId.current,
            selected,
            lastResponseRef.current,
          )
          showThanksThenClose()
          break
      }
    },
    [showThanksThenClose, showSubmittedThenClose, onTranscriptSelect],
  )

  return { state, lastResponse, open, handleSelect, handleTranscriptSelect }
}