export interface ProcurementCorrectionDraft {
  feeId: string
  targetOriginalAmount: string
  reason: string
  voucherFileId: string
  orderVersion: number
}

export function readCorrectionDraft(raw: string | null): ProcurementCorrectionDraft | null {
  if (!raw) return null
  const value: unknown = JSON.parse(raw)
  if (!value || typeof value !== 'object') throw new Error('费用更正草稿无法读取')
  const draft = value as Record<string, unknown>
  if (!['feeId', 'targetOriginalAmount', 'reason', 'voucherFileId'].every(key => typeof draft[key] === 'string') || !Number.isSafeInteger(draft.orderVersion)) throw new Error('费用更正草稿无法读取')
  return { feeId: draft.feeId as string, targetOriginalAmount: draft.targetOriginalAmount as string, reason: draft.reason as string, voucherFileId: draft.voucherFileId as string, orderVersion: draft.orderVersion as number }
}