import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress'
import 'nprogress/nprogress.css'
import { getAccessToken } from '@/utils/auth'
import { isRelogin } from '@/utils/request'

NProgress.configure({ showSpinner: false })

// 从菜单树中查找第一个可见叶子菜单路径（按接口返回顺序）
function findFirstLeafPathFromMenus(menus) {
  if (!Array.isArray(menus) || menus.length === 0) return null

  function dfs(list, parentPath = '') {
    for (const item of list) {
      if (item.visible === false) continue
      const rawPath = item.path || ''
      const currentPath = rawPath.startsWith('/')
        ? rawPath
        : `${parentPath}/${rawPath}`.replace(/\/+/g, '/')

      if (item.children && item.children.length > 0) {
        const found = dfs(item.children, currentPath)
        if (found != null) return found
      } else {
        return currentPath
      }
    }
    return null
  }
  return dfs(menus)
}

function findFirstLeafPathFromRoutes(routes) {
  if (!Array.isArray(routes) || routes.length === 0) return null
  const stack = [...routes]
  while (stack.length) {
    const route = stack.shift()
    if (!route || route.hidden === true) continue
    if (Array.isArray(route.children) && route.children.length > 0) {
      stack.unshift(...route.children)
      continue
    }
    const p = route.path || ''
    if (typeof p === 'string' && p.startsWith('/') && p !== '/404') {
      return p
    }
  }
  return null
}

// 增加三方登陆 update by 芋艿
const whiteList = ['/login', '/social-login',  '/auth-redirect', '/bind', '/register', '/oauthLogin/gitee']

router.beforeEach((to, from, next) => {
  NProgress.start()
  if (getAccessToken()) {
    to.meta.title && store.dispatch('settings/setTitle', to.meta.title)
    /* has token*/
    if (to.path === '/login') {
      next({ path: store.getters.defaultPath || '/' })
      NProgress.done()
    } else {
      if (store.getters.roles.length === 0) {
        isRelogin.show = true
        // 获取字典数据 add by 芋艿
        store.dispatch('dict/loadDictDatas')
        // 获取部门权限
        store.dispatch('GetLevel')
        // 判断当前用户是否已拉取完 user_info 信息
        store.dispatch('GetInfo').then(userInfo => {
          isRelogin.show = false
          // 触发 GenerateRoutes 事件时，将 menus 菜单树传递进去
            store.dispatch('GenerateRoutes', userInfo.menus).then(accessRoutes => {
            // 根据 roles 权限生成可访问的路由表
            router.addRoutes(accessRoutes) // 动态添加可访问路由表
            const menuDefaultPath = findFirstLeafPathFromMenus(userInfo.menus)
            const routeFallbackPath = findFirstLeafPathFromRoutes(accessRoutes)
            const defaultPath = menuDefaultPath || routeFallbackPath || '/'
            store.dispatch('SetDefaultPath', defaultPath)
            // 仅当目标为根路径 '/' 时跳默认页；否则保持当前路径（含刷新场景），避免刷新被误判为“未匹配”而跳到默认页
            if (to.path === '/') {
              const matched = router.match(defaultPath)
              const hasMatch = matched && Array.isArray(matched.matched) && matched.matched.length > 0
              const safePath = hasMatch ? defaultPath : (routeFallbackPath || '/')
              next({ path: safePath, replace: true })
            } else {
              next({ ...to, replace: true }) // hack方法 确保addRoutes已完成，当前页刷新时保留 to 的路径
            }
          })
        }).catch(err => {
          store.dispatch('LogOut').then(() => {
            Message.error(err)
            next({ path: '/' })
          })
        })
      } else {
        if (to.path === '/') {
          const defaultPath = store.getters.defaultPath || '/'
          next({ path: defaultPath, replace: true })
        } else {
          next()
        }
      }
    }
  } else {
    // 没有token
    if (whiteList.indexOf(to.path) !== -1) {
      // 在免登录白名单，直接进入
      next()
    } else {
      const redirect = encodeURIComponent(to.fullPath) // 编码 URI，保证参数跳转回去后，可以继续带上
      next(`/login?redirect=${redirect}`) // 否则全部重定向到登录页
      NProgress.done()
    }
  }
})

router.afterEach(() => {
  NProgress.done()
})