/** 数据权限分组列表模型（任务 59；module 13 task 253 扩展编辑能力）：解析 VO + 摘要 + 提交载荷。 */
import { unwrap } from '../../api/envelope.ts'

export interface ShopGroupItem {
  id: number
  name: string
  leaderUsername: string
  leaderUserId?: number
  memberCount: number
  memberUsernames: string[]
  memberUserIds?: number[]
  createdAt?: string
  updatedAt?: string
}

export interface ShopGroupFormErrors {
  groupName?: string
}

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
}

/** 解析单条分组项；缺 id 视为无效。 */
export function parseShopGroupItem(raw: unknown): ShopGroupItem | 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 names = Array.isArray(record.memberUsernames)
    ? record.memberUsernames.map((v) => text(v)).filter(Boolean)
    : []
  const memberIds = Array.isArray(record.memberUserIds)
    ? record.memberUserIds.map((v) => numberOrNull(v)).filter((v): v is number => v !== null && v > 0)
    : []
  const count = numberOrNull(record.memberCount)
  const item: ShopGroupItem = {
    id,
    name: text(record.groupName ?? record.name) || `分组${id}`,
    leaderUsername: text(record.leaderUsername ?? record.leader_name),
    memberCount: count === null ? names.length : count,
    memberUsernames: names,
  }
  const leaderId = numberOrNull(record.leaderUserId ?? record.leader_user_id)
  if (leaderId !== null && leaderId > 0) item.leaderUserId = leaderId
  if (memberIds.length) item.memberUserIds = memberIds
  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
}

/** 归一化分组列表响应（信封或裸数组）。 */
export function parseShopGroupList(payload: unknown): ShopGroupItem[] {
  const data = unwrap<unknown>(payload)
  if (!Array.isArray(data)) return []
  return data
    .map((raw) => parseShopGroupItem(raw))
    .filter((item): item is ShopGroupItem => item !== null)
}

/** 分组摘要：分组总数 + 组员总数。 */
export function shopGroupSummary(groups: ShopGroupItem[]): { groupCount: number; memberTotal: number } {
  let memberTotal = 0
  for (const group of groups) memberTotal += group.memberCount || 0
  return { groupCount: groups.length, memberTotal }
}

/** 分组名必填校验（镜像后端 NotBlank 文案「请输入分组名称」）。 */
export function validateShopGroupForm(name: string): ShopGroupFormErrors {
  const errors: ShopGroupFormErrors = {}
  if (!text(name)) errors.groupName = '请输入分组名称'
  return errors
}

/** 创建载荷：groupName + 成员 + 创建人（= 组长，当前操作者）。 */
export function toShopGroupCreatePayload(
  name: string,
  memberUserIds: number[],
  createdById: number,
): { groupName: string; memberUserIds: number[]; createdById: number } {
  return { groupName: text(name), memberUserIds: dedupeIds(memberUserIds), createdById }
}

/** 更新载荷：groupName + 成员（组长/创建人不可改）。 */
export function toShopGroupUpdatePayload(name: string, memberUserIds: number[]): { groupName: string; memberUserIds: number[] } {
  return { groupName: text(name), memberUserIds: dedupeIds(memberUserIds) }
}

function dedupeIds(ids: unknown[]): number[] {
  if (!Array.isArray(ids)) return []
  const set = new Set<number>()
  for (const v of ids) {
    const id = numberOrNull(v)
    if (id !== null && id > 0) set.add(id)
  }
  return [...set].sort((a, b) => a - b)
}