import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import { authService } from '@/api/services'
import { getItem, setItem, removeItem, StorageKeys } from '@/utils/storage'

export const useAuthStore = defineStore('auth', () => {
  const accessToken = ref<string | null>(getItem(StorageKeys.accessToken))
  const userId = ref<string | null>(getItem(StorageKeys.userId))
  const isNewUser = ref(false)

  const isLoggedIn = computed(() => !!accessToken.value)

  function applyTokens(data: { accessToken?: string; refreshToken?: string; userId?: string; isNewUser?: boolean }) {
    if (data.accessToken) {
      accessToken.value = data.accessToken
      setItem(StorageKeys.accessToken, data.accessToken)
    }
    if (data.refreshToken) setItem(StorageKeys.refreshToken, data.refreshToken)
    if (data.userId) {
      userId.value = data.userId
      setItem(StorageKeys.userId, data.userId)
    }
    isNewUser.value = !!data.isNewUser
  }

  /**
   * 演示登录：以 `demo_openid_xx` 作为 code 直连 Mock Provider，
   * 无需微信环境即可切换到预置演示用户（见实施计划 D2 / 登录策略）。
   */
  async function loginByDemoCode(code: string) {
    const data = await authService.demoLogin({ code })
    applyTokens(data)
    return data
  }

  function clearSession() {
    accessToken.value = null
    userId.value = null
    removeItem(StorageKeys.accessToken)
    removeItem(StorageKeys.refreshToken)
    removeItem(StorageKeys.userId)
    removeItem(StorageKeys.userStatusSnapshot)
  }

  async function logout() {
    try {
      await authService.logout()
    } catch {
      /* best-effort */
    }
    clearSession()
  }

  return { accessToken, userId, isNewUser, isLoggedIn, loginByDemoCode, applyTokens, clearSession, logout }
})