import { useEffect, useRef, useState } from 'react';

function toDraftValue(value, fallback = '') {
  if (value === undefined || value === null) {
    return fallback;
  }

  return String(value);
}

function useDraftValue(value, fallback, onCommit) {
  const [draft, setDraft] = useState(() => toDraftValue(value, fallback));
  const isEditingRef = useRef(false);
  const externalValue = toDraftValue(value, fallback);

  useEffect(() => {
    if (!isEditingRef.current && draft !== externalValue) {
      setDraft(externalValue);
    }
  }, [draft, externalValue]);

  const change = (nextValue) => {
    setDraft(nextValue);
    onCommit(nextValue);
  };

  return {
    value: draft,
    onFocus: () => {
      isEditingRef.current = true;
    },
    onBlur: () => {
      isEditingRef.current = false;
      onCommit(draft);
    },
    onChange: (event) => change(event.target.value),
  };
}

export function NodeDraftInput({ value, fallback = '', onCommit, ...props }) {
  const draftProps = useDraftValue(value, fallback, onCommit);

  return <input {...props} {...draftProps} />;
}

export function NodeDraftTextarea({ value, fallback = '', onCommit, ...props }) {
  const draftProps = useDraftValue(value, fallback, onCommit);

  return <textarea {...props} {...draftProps} />;
}