/** 去重汇总列表查询模型（任务 62）：解析 DedupeTotalDataPageVo(camel)，纯逻辑。 */
import { unwrap } from '../../api/envelope.ts'
import { ASIN_PAGE_DEFAULT_SIZE, type AsinListParams } from './asin-filter.ts'

export interface DedupeTotalItem {
  id: number
  dataValue: string
  country: string
  groupId: number | null
  groupName: string
  uploaderUserId: number | null
  username: string
  createdAt?: string
}

export interface DedupeTotalPageResult {
  items: DedupeTotalItem[]
  total: number
  page: number
  pageSize: number
}

export function emptyDedupeTotalPage(): DedupeTotalPageResult {
  return { items: [], total: 0, page: 1, pageSize: ASIN_PAGE_DEFAULT_SIZE }
}

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

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

/** 解析单条去重总数据；缺 id 视为无效。 */
export function toDedupeTotalItem(raw: unknown): DedupeTotalItem | null {
  if (!raw || typeof raw !== 'object') return null
  const record = raw as Record<string, unknown>
  const id = numberOrNull(record.id)
  if (id === null) return null
  const item: DedupeTotalItem = {
    id,
    dataValue: text(record.dataValue ?? record.data_value),
    country: text(record.country),
    groupId: numberOrNull(record.groupId ?? record.group_id),
    groupName: text(record.groupName ?? record.group_name),
    uploaderUserId: numberOrNull(record.uploaderUserId ?? record.uploader_user_id),
    username: text(record.username),
  }
  const createdAt = text(record.createdAt ?? record.created_at)
  if (createdAt) item.createdAt = createdAt
  return item
}

/** 归一化分页负载（信封或已解包 VO）为前端结果；缺省字段回默认。 */
export function parseDedupeTotalPage(payload: unknown): DedupeTotalPageResult {
  const out = emptyDedupeTotalPage()
  const core = unwrap<unknown>(payload)
  if (!core || typeof core !== 'object') return out
  const record = core as Record<string, unknown>
  if (Array.isArray(record.items)) {
    out.items = record.items
      .map((raw) => toDedupeTotalItem(raw))
      .filter((item): item is DedupeTotalItem => item !== null)
  }
  if (typeof record.total === 'number') out.total = Math.floor(record.total)
  if (typeof record.page === 'number' && record.page >= 1) out.page = Math.floor(record.page)
  const rawSize = record.pageSize ?? record.page_size
  if (typeof rawSize === 'number' && rawSize >= 1) out.pageSize = Math.floor(rawSize)
  return out
}

/** 构造缺省分页查询参数（供初始加载使用）。 */
export function emptyDedupePageParams(): Partial<AsinListParams> {
  return { page: 1, pageSize: ASIN_PAGE_DEFAULT_SIZE }
}