import { defineStore } from 'pinia'
import { computed, ref } from 'vue'

export interface User {
  id: string
  email: string
  display_name: string
  is_admin: boolean
}

function safeReadJSON<T>(key: string, fallback: T): T {
  try {
    const raw = localStorage.getItem(key)
    if (raw === null) return fallback
    return JSON.parse(raw) as T
  } catch {
    // 脏数据 / 反序列化失败 → 清掉，回退默认。
    try {
      localStorage.removeItem(key)
    } catch {
      /* noop */
    }
    return fallback
  }
}

function safeReadString(key: string): string | null {
  try {
    return localStorage.getItem(key)
  } catch {
    return null
  }
}

function safeWrite(key: string, value: string) {
  try {
    localStorage.setItem(key, value)
  } catch {
    /* QuotaExceeded / disabled */
  }
}

function safeRemove(key: string) {
  try {
    localStorage.removeItem(key)
  } catch {
    /* noop */
  }
}

export const useAuthStore = defineStore('auth', () => {
  const token = ref<string | null>(safeReadString('token'))
  const user = ref<User | null>(safeReadJSON<User | null>('user', null))

  const isAuthenticated = computed(() => !!token.value)
  const isAdmin = computed(() => !!user.value?.is_admin)

  function setSession(t: string, u: User) {
    token.value = t
    user.value = u
    safeWrite('token', t)
    safeWrite('user', JSON.stringify(u))
  }

  function clearSession() {
    token.value = null
    user.value = null
    safeRemove('token')
    safeRemove('user')
  }

  return { token, user, isAuthenticated, isAdmin, setSession, clearSession }
})