// 路由配置文件：定义应用的所有路由及导航守卫
import { createRouter, createWebHistory } from 'vue-router'
import { useUserStore } from '../store/user'
import { useDatabaseStore } from '../store/database'
import { useRegistrationStore } from '../store/registration'
import { migrateKey, readString } from '../utils/storage'
import { LEGACY_STORAGE_KEYS, STORAGE_KEYS } from '../utils/storageKeys'
import { loadPageSizeOptions } from '../composables/usePageSizeOptions'

// 创建路由实例，使用 HTML5 History 模式
const router = createRouter({
  history: createWebHistory(),
  routes: [
    {
      path: '/database-setup',
      name: 'DatabaseSetup',
      component: () => import('../views/DatabaseSettings.vue'), // 首次数据库配置引导页（无需登录）
    },
    {
      path: '/login',
      name: 'Login',
      component: () => import('../views/Login.vue'), // 登录页
    },
    {
      path: '/register',
      name: 'Register',
      component: () => import('../views/Register.vue'), // 注册页
    },
    {
      path: '/bill-import',
      name: 'BillImport',
      component: () => import('../views/BillImport.vue'), // 账单导入（独立页，无侧边栏）
    },
    {
      path: '/',
      component: () => import('../views/Layout.vue'), // 主布局（带侧边栏）
      redirect: '/dashboard', // 默认跳转到统计面板
      children: [
        {
          path: 'dashboard',
          name: 'Dashboard',
          component: () => import('../views/Dashboard.vue'), // 统计面板
        },
        {
          path: 'transactions',
          name: 'Transactions',
          component: () => import('../views/TransactionList.vue'), // 收支记录
        },
        {
          path: 'categories',
          name: 'Categories',
          component: () => import('../views/CategoryManage.vue'), // 分类管理
        },
        {
          path: 'tags',
          name: 'Tags',
          component: () => import('../views/TagManage.vue'), // 标签管理
        },
        {
          path: 'rules',
          name: 'Rules',
          component: () => import('../views/RuleManage.vue'), // 规则管理（自定义分类与标签规则）
        },
        {
          path: 'channels',
          name: 'Channels',
          component: () => import('../views/ChannelManage.vue'), // 交易渠道管理（独立页，不加入侧边栏）
        },
        {
          path: 'email-bills',
          // 跳转到上次访问的标签页，无记录时默认邮箱配置
          redirect: () => {
            const tabs = ['configs', 'senderRules', 'messages']
            // 读取前迁移旧键，保证老用户标签页偏好不丢失
            migrateKey(LEGACY_STORAGE_KEYS.emailBillTab, STORAGE_KEYS.emailBillTab)
            const saved = readString(STORAGE_KEYS.emailBillTab) || null
            return `/email-bills/${saved && tabs.includes(saved) ? saved : 'configs'}`
          },
        },
        {
          path: 'email-bills/:tab(configs|senderRules|messages)',
          name: 'EmailBills',
          component: () => import('../views/EmailBillManage.vue'), // 邮箱账单（邮箱配置/发件人规则/待处理账单）
        },
        {
          path: 'settings',
          name: 'Settings',
          component: () => import('../views/Settings.vue'), // 系统设置（数据库 + AI 模型）
        },
        {
          path: 'ai-usage',
          name: 'AiUsage',
          component: () => import('../views/AiUsage.vue'), // 模型使用情况
        },
        {
          path: 'logs',
          // 跳转到上次访问的日志标签页，无记录时默认访问日志
          redirect: () => {
            const tabs = ['http', 'login', 'app']
            // 读取前迁移旧键，保证老用户标签页偏好不丢失
            migrateKey(LEGACY_STORAGE_KEYS.logsTab, STORAGE_KEYS.logsTab)
            const saved = readString(STORAGE_KEYS.logsTab) || null
            return `/logs/${saved && tabs.includes(saved) ? saved : 'http'}`
          },
        },
        {
          path: 'logs/:tab(http|login|app)',
          name: 'Logs',
          component: () => import('../views/Logs.vue'), // 系统日志（访问日志/登录日志/运行日志）
        },
      ],
    },
  ],
})

// 全局前置守卫：优先校验数据库配置，再校验登录状态
router.beforeEach(async (to, _from, next) => {
  const databaseStore = useDatabaseStore()
  // 首次进入时从后端加载数据库配置状态
  if (!databaseStore.loaded) {
    await databaseStore.load()
  }

  // 数据库未配置：强制引导到配置页，避免用户卡在无法登录的状态
  if (!databaseStore.configured) {
    if (to.path === '/database-setup') {
      next()
    } else {
      next('/database-setup')
    }
    return
  }

  // 已配置数据库：配置引导页不再需要，跳转到登录或首页
  if (to.path === '/database-setup') {
    const userStore = useUserStore()
    next(userStore.token ? '/dashboard' : '/login')
    return
  }

  // 已登录用户访问登录/注册页时，自动跳转到回跳地址或首页
  const userStore = useUserStore()
  if ((to.path === '/login' || to.path === '/register') && userStore.token) {
    // 仅允许站内路径回跳，避免开放重定向
    const redirect = Array.isArray(to.query.redirect) ? to.query.redirect[0] : to.query.redirect
    const target =
      typeof redirect === 'string' && redirect.startsWith('/') && !redirect.startsWith('//')
        ? redirect
        : '/dashboard'
    next(target)
    return
  }

  // 注册功能关闭且已有用户时，不允许访问注册页
  if (to.path === '/register') {
    const registrationStore = useRegistrationStore()
    if (!registrationStore.loaded) {
      await registrationStore.load()
    }
    if (!registrationStore.status?.allowed) {
      next('/login')
      return
    }
  }

  // 如果目标页面不是登录/注册页，且没有 token，则重定向到登录页并记录来源，登录后可回跳
  if (to.path !== '/login' && to.path !== '/register' && !userStore.token) {
    next({ path: '/login', query: { redirect: to.fullPath } })
    return
  }

  // 已登录：预加载表格分页偏好，保证表格页首次渲染即拿到默认每页条数
  if (userStore.token) {
    await loadPageSizeOptions()
  }
  next()
})

export default router