/** 历史页“指定用户”下拉选项解析（module 13 task 259）：/api/admin/users?page_size=999 的用户精简选项。纯逻辑。 */
import { unwrap } from '../../api/envelope.ts'

export interface HistoryUserOption {
  id: number
  username: string
}

function idOf(value: unknown): number | null {
  return typeof value === 'number' && Number.isFinite(value) && value >= 1 ? Math.floor(value) : null
}

function text(value: unknown): string {
  return typeof value === 'string' ? value.trim() : ''
}

export function parseHistoryUserOptions(payload: unknown): HistoryUserOption[] {
  const core = unwrap<unknown>(payload)
  if (!core || typeof core !== 'object') return []
  const items = (core as Record<string, unknown>).items
  if (!Array.isArray(items)) return []
  const options: HistoryUserOption[] = []
  for (const raw of items) {
    if (!raw || typeof raw !== 'object') continue
    const row = raw as Record<string, unknown>
    const id = idOf(row.id)
    if (id === null) continue
    options.push({ id, username: text(row.username) || `#${id}` })
  }
  return options
}