import { ref } from 'vue'
import { useToast } from './useToast'
import { GetActivities, GetCurrentActivity, SwitchActivity } from '@wails/go/app/App'

// 活动项（与后端 types.ActivityInfo 对齐）
export interface ActivityItem {
  id: string
  displayName: string
}

// 模块级单例：活动列表与当前活动在所有组件中共享同一份状态
const activities = ref<ActivityItem[]>([])
const currentActivity = ref<ActivityItem | null>(null)
const switching = ref(false)

// 统一走 Wails 自动生成绑定，后端签名变化时可由 TypeScript 暴露问题。

export function useActivity() {
  const { showToast } = useToast()

  // 拉取全部活动与当前生效活动
  const loadActivities = async () => {
    try {
      const list = await GetActivities()
      activities.value = list || []
      try {
        currentActivity.value = await GetCurrentActivity()
      } catch {
        // 当前活动读取失败不阻塞列表展示
      }
    } catch (e: any) {
      showToast('读取活动列表失败', e?.message || '', 'error')
    }
  }

  // 切换活动；成功返回 true，调用方可据此刷新商品等数据
  const switchActivity = async (id: string): Promise<boolean> => {
    if (id === currentActivity.value?.id) return true
    switching.value = true
    try {
      const d: Record<string, any> = await SwitchActivity(id)
      if (d && d.success) {
        currentActivity.value = { id: d.activity, displayName: d.displayName }
        showToast('活动已切换', (d.displayName || id) + '，正在刷新商品...', 'success')
        return true
      }
      showToast('切换失败', d?.error || '', 'error')
      return false
    } catch (e: any) {
      showToast('切换失败', e?.message || '', 'error')
      return false
    } finally {
      switching.value = false
    }
  }

  return {
    activities,
    currentActivity,
    switching,
    loadActivities,
    switchActivity
  }
}