/*
 * Copyright 2026 Palantir Technologies, Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { useCallback, useState } from "react";
import { useEventCallback } from "../../shared/hooks/useEventCallback.js";
export function useFocusedRow({
  focusedRowId,
  onFocusedRowChanged,
  getRowById
}) {
  // Explicit check for undefined instead of != null
  // because null is a valid value to clear a focused row
  const isControlled = focusedRowId !== undefined;
  const [internalFocusedRowId, setInternalFocusedRowId] = useState(null);
  const effectiveId = isControlled ? focusedRowId ?? null : internalFocusedRowId;
  const fireChanged = useEventCallback(id => {
    const row = id != null ? getRowById(id) : null;
    onFocusedRowChanged?.(row);
  });
  const setFocusedRowId = useCallback(id => {
    if (effectiveId === id) return;
    if (!isControlled) {
      setInternalFocusedRowId(id);
    }
    fireChanged(id);
  }, [effectiveId, isControlled, fireChanged]);
  return {
    focusedRowId: effectiveId,
    setFocusedRowId,
    isControlled
  };
}
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