/** 最低价 ASIN 列表模型（任务 75）：解析 SkipPriceAsinPageVo(camel) 宽行(每店铺 5 国家 ASIN+最低价)，纯逻辑。 */
import { unwrap } from '../../api/envelope.ts'
import { ASIN_PAGE_DEFAULT_SIZE } from './asin-filter.ts'
import { ASIN_COUNTRY_CODES, type AsinCountryCode } from './asin-country.ts'

export interface SkipPriceItem {
  id: number
  groupId: number | null
  groupName: string
  shopName: string
  asinDe: string
  minimumPriceDe: number | null
  asinUk: string
  minimumPriceUk: number | null
  asinFr: string
  minimumPriceFr: number | null
  asinIt: string
  minimumPriceIt: number | null
  asinEs: string
  minimumPriceEs: number | null
  createdAt?: string
  updatedAt?: string
}

export interface SkipPricePageResult {
  items: SkipPriceItem[]
  total: number
  page: number
  pageSize: number
}

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

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

/** 数字或可解析数字串 → number；否则 null（BigDecimal 可能以字符串下发）。 */
function numberOrNull(value: unknown): number | null {
  if (typeof value === 'number' && Number.isFinite(value)) return value
  if (typeof value === 'string') {
    const trimmed = value.trim()
    if (trimmed && Number.isFinite(Number(trimmed))) return Number(trimmed)
  }
  return null
}

function idOrNull(value: unknown): number | null {
  const num = numberOrNull(value)
  return num === null ? null : Math.floor(num)
}

function lowerCode(code: AsinCountryCode): string {
  return code.toLowerCase()
}

/** 'DE' → 'De'，拼出 VO 驼峰字段后缀(asinDe/minimumPriceDe)。 */
function countrySuffix(code: string): string {
  return code.length > 1 ? code[0] + code.slice(1).toLowerCase() : code.toUpperCase()
}

/** 解析单条最低价 ASIN 店铺行；缺 id 视为无效。 */
export function toSkipPriceItem(raw: unknown): SkipPriceItem | null {
  if (!raw || typeof raw !== 'object') return null
  const record = raw as Record<string, unknown>
  const id = idOrNull(record.id)
  if (id === null) return null
  const item: SkipPriceItem = {
    id,
    groupId: idOrNull(record.groupId ?? record.group_id),
    groupName: text(record.groupName ?? record.group_name),
    shopName: text(record.shopName ?? record.shop_name),
    asinDe: '',
    minimumPriceDe: null,
    asinUk: '',
    minimumPriceUk: null,
    asinFr: '',
    minimumPriceFr: null,
    asinIt: '',
    minimumPriceIt: null,
    asinEs: '',
    minimumPriceEs: null,
  }
  const writable = item as unknown as Record<string, unknown>
  for (const code of ASIN_COUNTRY_CODES) {
    const suffix = countrySuffix(code)
    const camelAsin = `asin${suffix}`
    const snakeAsin = `asin_${lowerCode(code)}`
    writable[camelAsin] = text(record[camelAsin] ?? record[snakeAsin])
    const camelPrice = `minimumPrice${suffix}`
    const snakePrice = `minimum_price_${lowerCode(code)}`
    writable[camelPrice] = numberOrNull(record[camelPrice] ?? record[snakePrice])
  }
  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 parseSkipPricePage(payload: unknown): SkipPricePageResult {
  const out = emptySkipPricePage()
  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) => toSkipPriceItem(raw))
      .filter((item): item is SkipPriceItem => 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；国家码不属白名单返回空串。 */
export function skipPriceAsin(item: SkipPriceItem, country: string): string {
  if (!ASIN_COUNTRY_CODES.includes(country as AsinCountryCode)) return ''
  return item[`asin${countrySuffix(country)}` as keyof SkipPriceItem] as string
}

/** 取某国家最低价；国家码不属白名单返回 null。 */
export function skipPriceMinimum(item: SkipPriceItem, country: string): number | null {
  if (!ASIN_COUNTRY_CODES.includes(country as AsinCountryCode)) return null
  return item[`minimumPrice${countrySuffix(country)}` as keyof SkipPriceItem] as number | null
}