import { create } from 'zustand'

import { userApi } from '../http/userApi'
import type { UserQuery, UserRequest } from '../interfaces/user/api'
import type { Role, Status, User, UserSummary } from '../interfaces/user/model'
import { errorMessage } from '../utils/user'

interface UserStore {
  users: User[]
  total: number
  summary: UserSummary
  search: string
  roleFilter: Role | ''
  statusFilter: Status | ''
  selectedIds: Set<number>
  isLoading: boolean
  isSaving: boolean
  isBulkUpdating: boolean
  error: string
  setSearch: (search: string) => void
  setRoleFilter: (role: Role | '') => void
  setStatusFilter: (status: Status | '') => void
  clearFilters: () => void
  loadUsers: () => Promise<void>
  loadSummary: () => Promise<void>
  createUser: (payload: UserRequest) => Promise<boolean>
  updateUser: (id: number, payload: UserRequest) => Promise<boolean>
  deleteUser: (id: number) => Promise<boolean>
  updateSelectedStatus: (status: Status) => Promise<boolean>
  toggleSelected: (id: number) => void
  toggleAll: () => void
  clearError: () => void
}

const emptySummary: UserSummary = { total: 0, active: 0, inactive: 0, admins: 0 }

function queryFromState(state: UserStore): UserQuery {
  return {
    keyword: state.search,
    role: state.roleFilter,
    status: state.statusFilter,
    page: 1,
    pageSize: 50,
  }
}

export const useUserStore = create<UserStore>((set, get) => ({
  users: [],
  total: 0,
  summary: emptySummary,
  search: '',
  roleFilter: '',
  statusFilter: '',
  selectedIds: new Set<number>(),
  isLoading: true,
  isSaving: false,
  isBulkUpdating: false,
  error: '',
  setSearch: (search) => set({ search }),
  setRoleFilter: (roleFilter) => set({ roleFilter }),
  setStatusFilter: (statusFilter) => set({ statusFilter }),
  clearFilters: () => set({ search: '', roleFilter: '', statusFilter: '' }),
  loadUsers: async () => {
    set({ isLoading: true, error: '' })
    try {
      const data = await userApi.list(queryFromState(get()))
      set({ users: data.items, total: data.total, selectedIds: new Set<number>() })
    } catch (error) {
      set({ error: errorMessage(error, '无法加载用户列表') })
    } finally {
      set({ isLoading: false })
    }
  },
  loadSummary: async () => {
    try {
      const summary = await userApi.summary()
      set({ summary })
    } catch (error) {
      set({ error: errorMessage(error, '无法加载用户概览') })
    }
  },
  createUser: async (payload) => {
    set({ isSaving: true, error: '' })
    try {
      await userApi.create(payload)
      return true
    } catch (error) {
      set({ error: errorMessage(error, '保存失败，请检查输入') })
      return false
    } finally {
      set({ isSaving: false })
    }
  },
  updateUser: async (id, payload) => {
    set({ isSaving: true, error: '' })
    try {
      await userApi.update(id, payload)
      return true
    } catch (error) {
      set({ error: errorMessage(error, '保存失败，请检查输入') })
      return false
    } finally {
      set({ isSaving: false })
    }
  },
  deleteUser: async (id) => {
    set({ error: '' })
    try {
      await userApi.remove(id)
      return true
    } catch (error) {
      set({ error: errorMessage(error, '删除失败，请稍后重试') })
      return false
    }
  },
  updateSelectedStatus: async (status) => {
    const ids = [...get().selectedIds]
    if (ids.length === 0) return false
    set({ isBulkUpdating: true, error: '' })
    try {
      await userApi.updateStatuses({ ids, status })
      return true
    } catch (error) {
      set({ error: errorMessage(error, '批量更新失败，请稍后重试') })
      return false
    } finally {
      set({ isBulkUpdating: false })
    }
  },
  toggleSelected: (id) => set((state) => {
    const selectedIds = new Set(state.selectedIds)
    if (selectedIds.has(id)) selectedIds.delete(id)
    else selectedIds.add(id)
    return { selectedIds }
  }),
  toggleAll: () => set((state) => ({
    selectedIds: state.users.length > 0 && state.selectedIds.size === state.users.length
      ? new Set<number>()
      : new Set(state.users.map((user) => user.id)),
  })),
  clearError: () => set({ error: '' }),
}))