router.ts

import { createRouter, createWebHistory, RouterView } from 'vue-router'
import Home from './views/Home.vue'
import Nested from './views/Nested.vue'
import NestedWithId from './views/NestedWithId.vue'
import Dynamic from './views/Dynamic.vue'
import User from './views/User.vue'
import NotFound from './views/NotFound.vue'
const component = () => {
  console.log('fetching component')
  return import('./views/Generic.vue')
}
import LongView from './views/LongView.vue'
import GuardedWithLeave from './views/GuardedWithLeave.vue'
import ComponentWithData from './views/ComponentWithData.vue'
import { globalState } from './store'
import { scrollWaiter } from './scrollWaiter'
import RepeatedParams from './views/RepeatedParams.vue'
import RerenderCheck from './views/RerenderCheck.vue'
import { h } from 'vue'

let removeRoute: (() => void) | undefined

export const routerHistory = createWebHistory()
export const router = createRouter({
  history: routerHistory,
  strict: true,
  routes: [
    { path: '/home', redirect: '/' },
    {
      path: '/',
      components: { default: Home, other: component },
      props: { default: to => ({ waited: to.meta.waitedFor }) },
    },
    {
      path: '/always-redirect',
      redirect: () => ({
        name: 'user',
        params: { id: String(Math.round(Math.random() * 100)) },
      }),
    },
    { path: '/users/:id', name: 'user', component: User, props: true },
    { path: '/documents/:id', name: 'docs', component: User, props: true },
    { path: '/optional/:id?', name: 'optional', component: User, props: true },
    { path: encodeURI('/n/€'), name: 'euro', component },
    { path: '/n/:n', name: 'increment', component },
    { path: '/multiple/:a/:b', name: 'multiple', component },
    { path: '/long-:n', name: 'long', component: LongView },
    {
      path: '/lazy',
      meta: { transition: 'slide-left' },
      component: async () => {
        await delay(500)
        return component
      },
    },
    {
      path: '/with-guard/:n',
      name: 'guarded',
      component,
      beforeEnter(to) {
        if (to.params.n !== 'valid') return false
      },
    },
    { path: '/cant-leave', component: GuardedWithLeave },
    {
      path: '/children',
      name: 'WithChildren',
      component: Nested,
      children: [
        { path: '', alias: 'alias', name: 'default-child', component: Nested },
        { path: 'a', name: 'a-child', component: Nested },
        {
          path: 'b',
          name: 'WithChildrenB',
          component: Nested,
          children: [
            {
              path: '',
              name: 'b-child',
              component: Nested,
            },
            { path: 'a2', component: Nested },
            { path: 'b2', component: Nested },
          ],
        },
      ],
    },
    { path: '/with-data', component: ComponentWithData, name: 'WithData' },
    { path: '/rep/:a*', component: RepeatedParams, name: 'repeat' },
    { path: '/:data(.*)', component: NotFound, name: 'NotFound' },
    {
      path: '/nested',
      alias: '/anidado',
      component: Nested,
      name: 'Nested',
      children: [
        {
          path: 'nested',
          alias: 'a',
          name: 'NestedNested',
          component: Nested,
          children: [
            {
              name: 'NestedNestedNested',
              path: 'nested',
              component: Nested,
            },
          ],
        },
        {
          path: 'other',
          alias: 'otherAlias',
          component: Nested,
          name: 'NestedOther',
        },
        {
          path: 'also-as-absolute',
          alias: '/absolute',
          name: 'absolute-child',
          component: Nested,
        },
      ],
    },

    {
      path: '/parent/:id',
      name: 'parent',
      component: NestedWithId,
      props: true,
      alias: '/p/:id',
      children: [
        // empty child
        { path: '', name: 'child-id', component },
        // child with absolute path. we need to add an `id` because the parent needs it
        { path: '/p_:id/absolute-a', alias: 'as-absolute-a', component },
        // same as above but the alias is absolute
        { path: 'as-absolute-b', alias: '/p_:id/absolute-b', component },
      ],
    },
    {
      path: '/dynamic',
      name: 'dynamic',
      component: Nested,
      end: false,
      strict: true,
      beforeEnter(to) {
        if (!removeRoute) {
          removeRoute = router.addRoute('dynamic', {
            path: 'child',
            component: Dynamic,
          })
          return to.fullPath
        }
      },
    },

    {
      path: '/admin',
      children: [
        { path: '', component },
        { path: 'dashboard', component },
        { path: 'settings', component },
      ],
    },

    {
      path: '/rerender',
      component: RerenderCheck,
      children: [
        { path: 'a', component: { render: () => h('div', 'Child A') } },
        { path: 'b', component: { render: () => h('div', 'Child B') } },
      ],
    },
  ],
  async scrollBehavior(to, from, savedPosition) {
    await scrollWaiter.wait()
    if (savedPosition) {
      return savedPosition
    } else {
      if (to.matched.every((record, i) => from.matched[i] !== record))
        return { left: 0, top: 0 }
    }
    // leave scroll as it is by not returning anything
    // https://github.com/Microsoft/TypeScript/issues/18319
    return false
  },
})

// router.push({ name: 'user', params: {} })

const delay = (t: number) => new Promise(resolve => setTimeout(resolve, t))

// remove trailing slashes
router.beforeEach(to => {
  if (/.\/$/.test(to.path)) {
    to.meta.redirectCode = 301
    return to.path.replace(/\/$/, '')
  }
})

router.beforeEach(async to => {
  // console.log(`Guard from ${from.fullPath} to ${to.fullPath}`)
  if (to.params.id === 'no-name') return false

  const time = Number(to.query.delay)
  if (time > 0) {
    console.log('⏳ waiting ' + time + 'ms')
    to.meta.waitedFor = time
    await delay(time)
  }
})

router.beforeEach(() => {
  if (globalState.cancelNextNavigation) return false
})

router.afterEach((to, from) => {
  if (to.name === from.name && to.name === 'repeat') {
    const toDepth = to.path.split('/').length
    const fromDepth = from.path.split('/').length
    to.meta.transition = toDepth < fromDepth ? 'slide-right' : 'slide-left'
  }
})

router.afterEach((to, from) => {
  // console.log(
  //   `After guard: from ${from.fullPath} to ${
  //     to.fullPath
  //   } | location = ${location.href.replace(location.origin, '')}`
  // )
})

export function go(delta: number) {
  return new Promise((resolve, reject) => {
    function popStateListener() {
      clearTimeout(timeout)
    }
    window.addEventListener('popstate', popStateListener)

    function clearHooks() {
      removeAfterEach()
      removeOnError()
      window.removeEventListener('popstate', popStateListener)
    }

    // if the popstate event is not called, consider this a failure
    const timeout = setTimeout(() => {
      clearHooks()
      reject(new Error('Failed to use router.go()'))
      // using 0 leads to false positives
    }, 1)

    const removeAfterEach = router.afterEach((_to, _from, failure) => {
      clearHooks()
      resolve(failure)
    })
    const removeOnError = router.onError(err => {
      clearHooks()
      reject(err)
    })

    router.go(delta)
  })
}

// @ts-expect-error
window._go = go

router.beforeEach(to => {
  // console.log('second guard')
  if (typeof to.query.to === 'string' && to.query.to) return to.query.to
})

const dirLog = {
  '': '？',
  back: '⏪',
  forward: '⏩',
}
routerHistory.listen((to, from, info) => {
  console.log(`${dirLog[info.direction]} as a ${info.type}`)
})