/** 查询 ASIN 列表查询模型（任务 71）：解析 QueryAsinPageVo(camel) 与每店铺 5 国家 ASIN 宽行，纯逻辑。 */
import { unwrap } from '../../api/envelope.ts'
import { ASIN_PAGE_DEFAULT_SIZE } from './asin-filter.ts'

export const QUERY_ASIN_COUNTRIES = ['DE', 'UK', 'FR', 'IT', 'ES'] as const
export type QueryAsinCountry = (typeof QUERY_ASIN_COUNTRIES)[number]

export interface QueryAsinItem {
  id: number
  groupId: number | null
  groupName: string
  shopName: string
  asinDe: string
  asinUk: string
  asinFr: string
  asinIt: string
  asinEs: string
  createdAt?: string
  updatedAt?: string
}

export interface QueryAsinPageResult {
  items: QueryAsinItem[]
  total: number
  page: number
  pageSize: number
}

export function emptyQueryAsinPage(): QueryAsinPageResult {
  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
}

const COUNTRY_COLUMN: Record<string, keyof Pick<QueryAsinItem, 'asinDe' | 'asinUk' | 'asinFr' | 'asinIt' | 'asinEs'>> = {
  DE: 'asinDe',
  UK: 'asinUk',
  FR: 'asinFr',
  IT: 'asinIt',
  ES: 'asinEs',
}

/** 解析单条查询 ASIN 店铺行；缺 id 视为无效。 */
export function toQueryAsinItem(raw: unknown): QueryAsinItem | 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: QueryAsinItem = {
    id,
    groupId: numberOrNull(record.groupId ?? record.group_id),
    groupName: text(record.groupName ?? record.group_name),
    shopName: text(record.shopName ?? record.shop_name),
    asinDe: text(record.asinDe ?? record.asin_de),
    asinUk: text(record.asinUk ?? record.asin_uk),
    asinFr: text(record.asinFr ?? record.asin_fr),
    asinIt: text(record.asinIt ?? record.asin_it),
    asinEs: text(record.asinEs ?? record.asin_es),
  }
  const createdAt = text(record.createdAt ?? record.created_at)
  if (createdAt) item.createdAt = createdAt
  const updatedAt = text(record.updatedAt ?? record.updated_at)
  if (updatedAt) item.updatedAt = updatedAt
  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 parseQueryAsinPage(payload: unknown): QueryAsinPageResult {
  const out = emptyQueryAsinPage()
  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) => toQueryAsinItem(raw))
      .filter((item): item is QueryAsinItem => 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
}

/** 取某国家列 ASIN；国家码不属白名单时返回空串。 */
export function asinForCountry(item: QueryAsinItem, country: string): string {
  const column = COUNTRY_COLUMN[country]
  return column ? item[column] : ''
}

/** 该店铺行是否存在任一国家 ASIN。 */
export function queryAsinItemHasAnyAsin(item: QueryAsinItem): boolean {
  return QUERY_ASIN_COUNTRIES.some((code) => asinForCountry(item, code) !== '')
}

/** 纵向行条目（对齐 admin.js renderQueryAsinEntries）：按 DE/UK/FR/IT/ES 顺序收集有值国家；全空补一条空条目。 */
export interface QueryAsinRowEntry {
  country: QueryAsinCountry | null
  asin: string
}

export function queryAsinRowEntries(item: QueryAsinItem): QueryAsinRowEntry[] {
  const entries: QueryAsinRowEntry[] = []
  for (const code of QUERY_ASIN_COUNTRIES) {
    const asin = asinForCountry(item, code)
    if (asin) entries.push({ country: code, asin })
  }
  if (!entries.length) entries.push({ country: null, asin: '' })
  return entries
}

/** 纵向展示行（对齐 admin.js renderQueryAsinRows）：序号/分组/店铺/操作 按 rowspan 合并，逐国一行。 */
export interface QueryAsinDisplayRow {
  key: string
  rowNo: number
  rowspan: number
  isFirst: boolean
  country: QueryAsinCountry | null
  asin: string
  item: QueryAsinItem
}

export function queryAsinDisplayRows(items: QueryAsinItem[], startRowNo: number): QueryAsinDisplayRow[] {
  const out: QueryAsinDisplayRow[] = []
  let rowNo = Math.max(Math.floor(startRowNo || 1), 1)
  for (const item of items) {
    const entries = queryAsinRowEntries(item)
    entries.forEach((entry, index) => {
      out.push({
        key: `${item.id}:${index}`,
        rowNo,
        rowspan: entries.length,
        isFirst: index === 0,
        country: entry.country,
        asin: entry.asin,
        item,
      })
    })
    rowNo += 1
  }
  return out
}