/**
 * Item-equality helpers. 1:1 port of Base UI React's
 * `packages/react/src/internals/itemEquality.ts` — no framework-specific
 * pieces.
 */

export const defaultItemEquality = (itemValue, selectedValue) => Object.is(itemValue, selectedValue);
export function compareItemEquality(itemValue, selectedValue, comparer) {
  if (itemValue == null || selectedValue == null) {
    return Object.is(itemValue, selectedValue);
  }
  return comparer(itemValue, selectedValue);
}
export function selectedValueIncludes(selectedValues, itemValue, comparer) {
  if (!selectedValues || selectedValues.length === 0) {
    return false;
  }
  return selectedValues.some(selectedValue => {
    if (selectedValue === undefined) return false;
    return compareItemEquality(itemValue, selectedValue, comparer);
  });
}
export function findItemIndex(itemValues, selectedValue, comparer) {
  if (!itemValues || itemValues.length === 0) {
    return -1;
  }
  return itemValues.findIndex(itemValue => {
    if (itemValue === undefined) return false;
    return compareItemEquality(itemValue, selectedValue, comparer);
  });
}
export function removeItem(selectedValues, itemValue, comparer) {
  return selectedValues.filter(selectedValue => !compareItemEquality(itemValue, selectedValue, comparer));
}
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