import { useState, useEffect, useMemo, useRef, useCallback } from 'react'
import { parseSearchQueryForQuickCreate } from '../utils/exerciseAiQuickCreate'

/**
 * Titel aus Suche vorbelegen; Kurzbeschreibung optional und manuell editierbar.
 * Suchwechsel setzt „touched“ zurück und befüllt neu — solange der Nutzer nicht editiert hat.
 */
export function useExerciseAiQuickCreateFields(debouncedSearch, { enabled = true } = {}) {
  const [title, setTitleState] = useState('')
  const [sketch, setSketchState] = useState('')
  const [focusAreaId, setFocusAreaId] = useState('')
  const titleTouchedRef = useRef(false)
  const sketchTouchedRef = useRef(false)
  const lastSearchRef = useRef('')

  const parsed = useMemo(() => parseSearchQueryForQuickCreate(debouncedSearch), [debouncedSearch])

  useEffect(() => {
    if (!enabled) return
    if (debouncedSearch !== lastSearchRef.current) {
      lastSearchRef.current = debouncedSearch
      titleTouchedRef.current = false
      sketchTouchedRef.current = false
    }
    if (!debouncedSearch) return
    if (!titleTouchedRef.current) {
      setTitleState(parsed.title)
    }
    if (!sketchTouchedRef.current) {
      setSketchState('')
    }
  }, [enabled, debouncedSearch, parsed.title])

  const setTitle = useCallback((v) => {
    titleTouchedRef.current = true
    setTitleState(v)
  }, [])

  const setSketch = useCallback((v) => {
    sketchTouchedRef.current = true
    setSketchState(v)
  }, [])

  const resetQuickCreateFields = useCallback(() => {
    setTitleState('')
    setSketchState('')
    setFocusAreaId('')
    titleTouchedRef.current = false
    sketchTouchedRef.current = false
    lastSearchRef.current = ''
  }, [])

  return {
    title,
    sketch,
    focusAreaId,
    setTitle,
    setSketch,
    setFocusAreaId,
    resetQuickCreateFields,
  }
}