import { defineStore } from 'pinia'
import { ref } from 'vue'
import type { InviteActivitySummary } from '@mp-pilates/shared'
import { get, post } from '../utils/request'

export const useInviteStore = defineStore('invite', () => {
  const activity = ref<InviteActivitySummary | null>(null)
  let activityRevision = 0
  async function refreshActivity() {
    const requestRevision = ++activityRevision
    try {
      const result = await get<InviteActivitySummary>('/invite/activity')
      if (requestRevision === activityRevision) activity.value = result
    } catch (err) {
      if (requestRevision === activityRevision) activity.value = null
      throw err
    }
  }
  const code = ref('')
  const eligible = ref(false)
  const pendingCode = ref('')
  let revision = 0
  let confirming = false
  async function refresh() {
    if (confirming) return
    const requestRevision = ++revision
    const result = await get<{ inviteCode: string; discountEligible: boolean }>('/invite/code')
    if (requestRevision !== revision) return
    code.value = result.inviteCode
    eligible.value = result.discountEligible
  }
  async function confirm(value: string) {
    const requestRevision = ++revision
    confirming = true
    try {
      const result = await post<{ inviteCode: string; discountEligible: boolean }>('/invite/confirm', { code: value })
      if (requestRevision !== revision) throw new Error('登录状态已变化，请重试')
      code.value = result.inviteCode
      eligible.value = result.discountEligible
      pendingCode.value = ''
    } finally {
      confirming = false
    }
  }
  function reset() {
    activityRevision++
    activity.value = null
    revision++
    code.value = ''
    eligible.value = false
    pendingCode.value = ''
  }
  function price(value: number) { return eligible.value ? Math.round(value * 95 / 100) : value }
  return { activity, refreshActivity, code, eligible, pendingCode, refresh, confirm, reset, price }
})