import { defineStore } from 'pinia'
import { ref } from 'vue'
import { get, post, put, del } from '../utils/request'
import type {
  CardType,
  CreateCardTypeDto,
  UpdateCardTypeDto,
  StudioConfig,
  UpdateStudioConfigDto,
  OrderWithDetails,
  TimeSlot,
  CreateManualSlotDto,
  PaginatedData,
  ScheduleSlotPreview,
  PublishDaySlotsDto,
  FlashSaleAdminItem,
  CreateFlashSaleDto,
  UpdateFlashSaleDto,
  CreateStudioUploadCredentialDto,
  StudioUploadCredential,
} from '@mp-pilates/shared'

interface LegacyPaginatedData<T> {
  readonly data: readonly T[]
  readonly total: number
  readonly page: number
  readonly limit: number
}

function normalizePaginatedData<T>(
  result: PaginatedData<T> | LegacyPaginatedData<T>,
): PaginatedData<T> {
  if ('items' in result) {
    return {
      items: [...result.items],
      total: result.total,
      page: result.page,
      limit: result.limit,
    }
  }

  return {
    items: [...result.data],
    total: result.total,
    page: result.page,
    limit: result.limit,
  }
}

export interface AdminStats {
  todayBookings: number
  totalOrders: number
  totalBookings: number
}

export interface MemberSummary {
  userId: string
  openid: string
  nickname: string
  phone: string | null
  avatarUrl: string | null
  totalBookings: number
  completedBookings: number
  cancelledBookings: number
}

export interface UserMembership {
  userId: string
  membership: {
    id: string
    cardTypeId: string
    remainingTimes: number | null
    startDate: string
    expireDate: string
    status: string
    cardType: {
      id: string
      name: string
      type: string
      totalTimes: number | null
      durationDays: number
    }
  } | null
}

export const useAdminStore = defineStore('admin', () => {
  // ── Card types ───────────────────────────────────────────────────
  const cardTypes = ref<CardType[]>([])

  async function fetchCardTypes(): Promise<CardType[]> {
    const data = await get<CardType[]>('/admin/card-types')
    cardTypes.value = [...data].sort((a, b) => a.sortOrder - b.sortOrder)
    return cardTypes.value
  }

  async function createCardType(dto: CreateCardTypeDto): Promise<CardType> {
    const data = await post<CardType>('/admin/card-types', dto as unknown as Record<string, unknown>)
    await fetchCardTypes()
    return data
  }

  async function updateCardType(id: string, dto: UpdateCardTypeDto): Promise<CardType> {
    const data = await put<CardType>(`/admin/card-types/${id}`, dto as unknown as Record<string, unknown>)
    await fetchCardTypes()
    return data
  }

  async function deleteCardType(id: string): Promise<{ deleted: boolean; deactivated: boolean }> {
    const result = await del<{ deleted: boolean; deactivated: boolean }>(`/admin/card-types/${id}`)
    await fetchCardTypes()
    return result
  }

  // ── Studio config ────────────────────────────────────────────────
  const studioConfig = ref<StudioConfig | null>(null)

  async function fetchStudioConfig(): Promise<StudioConfig> {
    const data = await get<StudioConfig>('/studio/info')
    studioConfig.value = data
    return data
  }

  async function saveStudioConfig(dto: UpdateStudioConfigDto): Promise<StudioConfig> {
    const data = await put<StudioConfig>('/admin/studio/info', dto as unknown as Record<string, unknown>)
    studioConfig.value = data
    return data
  }

  async function createStudioUploadCredential(
    dto: CreateStudioUploadCredentialDto,
  ): Promise<StudioUploadCredential> {
    return post<StudioUploadCredential>(
      '/admin/studio/upload-credentials',
      dto as unknown as Record<string, unknown>,
    )
  }

  // ── Orders ───────────────────────────────────────────────────────
  async function fetchAdminOrders(params: {
    page?: number
    limit?: number
    status?: string
  }): Promise<PaginatedData<OrderWithDetails>> {
    const result = await get<PaginatedData<OrderWithDetails> | LegacyPaginatedData<OrderWithDetails>>(
      '/admin/orders',
      params,
    )
    return normalizePaginatedData(result)
  }

  // ── Bookings ─────────────────────────────────────────────────────
  async function fetchAdminBookings(params?: {
    page?: number
    limit?: number
    userId?: string
  }): Promise<PaginatedData<any>> {
    return get<PaginatedData<any>>('/admin/bookings', params)
  }

  // ── Members ──────────────────────────────────────────────────────
  async function fetchMembers(params?: {
    page?: number
    limit?: number
    search?: string
    cardType?: string
  }): Promise<PaginatedData<MemberSummary>> {
    const cleanParams: Record<string, unknown> = {}
    if (params?.page != null) cleanParams.page = params.page
    if (params?.limit != null) cleanParams.limit = params.limit
    if (params?.search) cleanParams.search = params.search
    if (params?.cardType) cleanParams.cardType = params.cardType
    return get<PaginatedData<MemberSummary>>('/admin/members', cleanParams)
  }

  async function getUserMembership(userId: string): Promise<UserMembership> {
    return get<UserMembership>(`/admin/members/${userId}/membership`)
  }

  async function updateUserMembership(
    userId: string,
    dto: {
      cardTypeId: string
      remainingTimes?: number | null
      startDate: string
      expireDate: string
    },
  ): Promise<any> {
    return put<any>(`/admin/members/${userId}/membership`, dto)
  }

  async function deleteUserMembership(userId: string): Promise<void> {
    return del<void>(`/admin/members/${userId}/membership`)
  }

  // ── Time slots ───────────────────────────────────────────────────
  async function fetchSlotsByDate(date: string): Promise<TimeSlot[]> {
    return get<TimeSlot[]>('/admin/time-slots', { date })
  }

  async function createManualSlot(dto: CreateManualSlotDto): Promise<TimeSlot> {
    return post<TimeSlot>('/admin/time-slot/manual', dto as unknown as Record<string, unknown>)
  }

  async function closeSlot(id: string): Promise<TimeSlot> {
    return put<TimeSlot>(`/admin/time-slot/${id}/close`, {})
  }

  async function generateSlots(startDate: string, endDate: string): Promise<{ count: number }> {
    return post<{ count: number }>('/admin/generate-slots', { startDate, endDate })
  }

  // ── Schedule management ─────────────────────────────────────────
  const schedulePreview = ref<ScheduleSlotPreview[]>([])
  const scheduleLoading = ref(false)

  async function fetchSchedulePreview(date: string): Promise<ScheduleSlotPreview[]> {
    scheduleLoading.value = true
    try {
      const data = await get<ScheduleSlotPreview[]>('/admin/schedule/preview', { date })
      schedulePreview.value = data
      return data
    } finally {
      scheduleLoading.value = false
    }
  }

  async function publishDaySlots(dto: PublishDaySlotsDto): Promise<void> {
    await post('/admin/schedule/publish', dto as unknown as Record<string, unknown>)
    await fetchSchedulePreview(dto.date)
  }

  // ── Dashboard stats ──────────────────────────────────────────────
  async function fetchDashboardStats(): Promise<AdminStats> {
    return get<AdminStats>('/admin/stats')
  }

  // ── Flash sales ─────────────────────────────────────────────────
  async function fetchFlashSales(params?: {
    page?: number
    limit?: number
  }): Promise<PaginatedData<FlashSaleAdminItem>> {
    return get<PaginatedData<FlashSaleAdminItem>>('/admin/flash-sales', params as Record<string, unknown>)
  }

  async function createFlashSale(dto: CreateFlashSaleDto): Promise<FlashSaleAdminItem> {
    return post<FlashSaleAdminItem>('/admin/flash-sales', dto as unknown as Record<string, unknown>)
  }

  async function updateFlashSale(id: string, dto: UpdateFlashSaleDto): Promise<FlashSaleAdminItem> {
    return put<FlashSaleAdminItem>(`/admin/flash-sales/${id}`, dto as unknown as Record<string, unknown>)
  }

  async function deleteFlashSale(id: string): Promise<{ deleted: boolean }> {
    return del<{ deleted: boolean }>(`/admin/flash-sales/${id}`)
  }

  return {
    // State
    cardTypes,
    studioConfig,
    schedulePreview,
    scheduleLoading,
    // Card types
    fetchCardTypes,
    createCardType,
    updateCardType,
    deleteCardType,
    // Studio
    fetchStudioConfig,
    saveStudioConfig,
    createStudioUploadCredential,
    // Orders
    fetchAdminOrders,
    // Bookings
    fetchAdminBookings,
    // Members
    fetchMembers,
    getUserMembership,
    updateUserMembership,
    deleteUserMembership,
    // Time slots
    fetchSlotsByDate,
    createManualSlot,
    closeSlot,
    generateSlots,
    // Schedule
    fetchSchedulePreview,
    publishDaySlots,
    // Stats
    fetchDashboardStats,
    // Flash sales
    fetchFlashSales,
    createFlashSale,
    updateFlashSale,
    deleteFlashSale,
  }
})