import axios from 'axios'
import { ElMessage } from 'element-plus'

let lastToastKey = ''
let lastToastAt = 0

function toastErrorOnce(key, message, minIntervalMs = 1500) {
  const now = Date.now()
  if (key === lastToastKey && now - lastToastAt < minIntervalMs) return
  lastToastKey = key
  lastToastAt = now
  ElMessage.error(message)
}

function getCookie(name) {
  const escaped = String(name || '').replace(/([.*+?^${}()|[\]\\])/g, '\\$1')
  const match = document.cookie.match(new RegExp(`(?:^|; )${escaped}=([^;]*)`))
  return match ? decodeURIComponent(match[1]) : ''
}

export const publicApi = axios.create({
  baseURL: '/api',
  timeout: 30_000,
  withCredentials: true,
})

publicApi.interceptors.request.use((config) => {
  const method = String(config?.method || 'GET').toUpperCase()
  if (!['GET', 'HEAD', 'OPTIONS'].includes(method)) {
    const token = getCookie('csrf_token')
    if (token) {
      config.headers = config.headers || {}
      config.headers['X-CSRF-Token'] = token
    }
  }
  return config
})

publicApi.interceptors.response.use(
  (response) => response,
  (error) => {
    const status = error?.response?.status
    const payload = error?.response?.data
    const message = payload?.error || payload?.message || error?.message || '请求失败'

    if (status === 401) {
      const pathname = window.location?.pathname || ''
      // 登录页面不弹通知，让 LoginPage.vue 自己处理错误显示
      if (!pathname.startsWith('/login')) {
        toastErrorOnce('401', message || '登录已过期，请重新登录', 3000)
        window.location.href = '/login'
      }
    } else if (status === 403) {
      toastErrorOnce('403', message || '无权限', 5000)
    } else if (error?.code === 'ECONNABORTED') {
      toastErrorOnce('timeout', '请求超时', 3000)
    } else if (!status) {
      toastErrorOnce(`net:${message}`, message, 3000)
    }

    return Promise.reject(error)
  },
)