import type { PersonalData } from '@/types'

/** True when `member` is the signed-in user identified by `personalDataUuid`. */
export function isSelf(member: PersonalData, personalDataUuid: string | null): boolean {
  return personalDataUuid !== null && member.uuid === personalDataUuid
}

/**
 * Stable-sorts `members` so the signed-in user (if present among them) comes
 * first, leaving every other member in their original relative order.
 *
 * Used to put "your" `ParentBalanceForm` ahead of a partner's in any UI that
 * lists both — see `ParentBalanceForm.tsx`.
 */
export function orderSelfFirst(
  members: PersonalData[],
  personalDataUuid: string | null,
): PersonalData[] {
  const self = members.filter((m) => isSelf(m, personalDataUuid))
  const others = members.filter((m) => !isSelf(m, personalDataUuid))
  return [...self, ...others]
}