import assert from 'node:assert/strict'
import { readFileSync } from 'node:fs'
import test from 'node:test'
import { parse } from '@vue/compiler-sfc'
import ts from 'typescript'
import { ref, reactive, computed, nextTick, watch, effectScope } from 'vue'

function harness(file: string) {
  const base = `/m/pl/${file}`
  let path = base
  let leave: any
  let unmount: any
  const hooks = new Set<any>()
  const scrolls: number[] = []
  const user = reactive({ accessToken: 'a', getUserInfo: { tenantNo: 'a' } })
  const bindings = {
    ref,
    nextTick,
    watch,
    useRoute: () => ({ path }),
    useRouter: () => ({
      afterEach: (fn: any) => {
        hooks.add(fn)
        return () => hooks.delete(fn)
      }
    }),
    useUserStore: () => user,
    onBeforeRouteLeave: (fn: any) => {
      leave = fn
    },
    onBeforeUnmount: (fn: any) => {
      unmount = fn
    },
    window: { scrollY: 720, scrollTo: ({ top }: any) => scrolls.push(top) }
  }
  const helper = readFileSync(
    new URL('../src/views/m/crm/useListReturnState.ts', import.meta.url),
    'utf8'
  )
    .replace(/^import .*$/gm, '')
    .replace('export function', 'function')
  const useState = new Function(
    ...Object.keys(bindings),
    ts.transpile(helper, { target: ts.ScriptTarget.ESNext }) + ';return useListReturnState'
  )(...Object.values(bindings))
  const descriptor = parse(
    readFileSync(new URL(`../src/views/m/pl/${file}/index.vue`, import.meta.url), 'utf8')
  ).descriptor
  const source = ts.createSourceFile(
    'page.ts',
    descriptor.scriptSetup!.content,
    ts.ScriptTarget.Latest,
    true
  )
  const scopes: ReturnType<typeof effectScope>[] = []
  function create(enableRetry = true) {
    const requests: any[] = []
    const state: any = {
      userStore: user,
      page: ref(1),
      plans: ref([]),
      total: ref(60),
      loading: ref(false),
      error: ref(''),
      forbidden: ref(false),
      failedMore: ref(false),
      selected: ref(new Set()),
      expandedIds: ref(new Set()),
      pageSize: 20,
      plPlanListTabToFilters: () => ({}),
      HttpError: Error,
      ApiStatus: { forbidden: 403 },
      planApi: {
        list: (params: any) =>
          new Promise((resolve, reject) => requests.push({ params, resolve, reject }))
      }
    }
    for (const key of [
      'keyword',
      'appliedKeyword',
      'activeTab',
      'dateShortcut',
      'customFrom',
      'customTo',
      'customDateLabel',
      'tab',
      'dateKind',
      'readyKind'
    ])
      state[key] = ref('')
    for (const key of ['dateRange', 'dates']) state[key] = ref([])
    state.filterState = ref({})
    state.sortState = ref({})
    state.hasMore = computed(() => state.plans.value.length < state.total.value)
    state.query = () => ({ q: state.appliedKeyword.value, ...state.filterState.value })
    const names = ['requestKey', 'buildParams', 'fetchPage', 'load', 'retryLoad']
    const code = source.statements
      .filter(
        (n) =>
          (ts.isFunctionDeclaration(n) && names.includes(n.name?.text || '')) ||
          (ts.isVariableStatement(n) &&
            n.declarationList.declarations.some((d) =>
              ['sessionScope', 'listReturnState'].includes(d.name.getText(source))
            ))
      )
      .map((n) => n.getText(source))
      .join('\n')
    const scope = effectScope()
    scopes.push(scope)
    const api = scope.run(() =>
      new Function(
        ...Object.keys(state),
        'useListReturnState',
        `let disposed=false;let requestVersion=0;${ts.transpile(code, { target: ts.ScriptTarget.ESNext })};return {state:listReturnState,retry:typeof retryLoad==='function'?retryLoad:undefined,run:${file === 'plan' ? 'fetchPage' : '(reset)=>load(!reset)'}}`
      )(...Object.values(state), (options: any) => {
        if (!enableRetry) delete options.retryFailedRestore
        return useState(options)
      })
    )
    return { ...state, ...api, requests }
  }
  function navigate(to: string) {
    const from = path
    path = to
    for (const fn of hooks) fn({ path: to }, { path: from })
  }
  function returned(enableRetry = true) {
    const first = create()
    first.keyword.value = first.appliedKeyword.value = 'saved'
    first.page.value = 3
    first.expandedIds.value = new Set(['row-2'])
    leave({ path: `${base}/row-2` })
    navigate(`${base}/row-2`)
    unmount()
    navigate(base)
    return create(enableRetry)
  }
  return {
    create,
    returned,
    user,
    scrolls,
    leave: () => leave({ path: '/workbench' }),
    unmount: () => unmount(),
    close: () => scopes.forEach((s) => s.stop()),
    template: descriptor.template!.content
  }
}
async function flush() {
  for (let i = 0; i < 8; i++) await nextTick()
}
async function success(h: any, index: number) {
  assert.ok(h.requests[index], `request ${index} exists`)
  const page = h.requests[index].params.page
  h.requests[index].resolve({ list: [{ id: `row-${page}` }], total: 60 })
  await flush()
}
for (const file of ['plan', 'plan-cert']) {
  for (const failedPage of [1, 2])
    test(`${file}: page ${failedPage} restoration failure retries via real page handler then consumes snapshot`, async () => {
      const env = harness(file)
      try {
        const h = env.returned()
        const first = h.state.restore()
        if (failedPage === 2) await success(h, 0)
        h.requests[failedPage - 1].reject(new Error('offline'))
        await first
        assert.equal(h.keyword.value, 'saved')
        assert.equal(h.state.restoring.value, false)
        assert.equal(typeof h.retry, 'function', 'page must route retry through restoration')
        assert.match(env.template, /@click="retryLoad"/)
        const start = h.requests.length
        const retry = h.retry()
        await flush()
        for (let i = 0; i < 3; i++) await success(h, start + i)
        await retry
        assert.equal(h.page.value, 3)
        assert.deepEqual([...h.expandedIds.value], ['row-2'])
        assert.deepEqual(env.scrolls, [720])
        const ordinary = h.retry()
        await flush()
        await success(h, h.requests.length - 1)
        await ordinary
        assert.equal(h.page.value, 4)
        assert.deepEqual(env.scrolls, [720])
      } finally {
        env.close()
      }
    })
  test(`${file}: duplicate retry does not create requests or release restoring`, async () => {
    const env = harness(file)
    try {
      const h = env.returned()
      const first = h.state.restore()
      h.requests[0].reject(new Error('offline'))
      await first
      assert.equal(typeof h.retry, 'function')
      const retry = h.retry()
      await flush()
      await h.retry()
      assert.equal(h.requests.length, 2)
      assert.equal(h.state.restoring.value, true)
      for (let i = 1; i <= 3; i++) await success(h, i)
      await retry
      assert.deepEqual(env.scrolls, [720])
    } finally {
      env.close()
    }
  })
  for (const change of ['query', 'account', 'tenant', 'unmount', 'leave'])
    test(`${file}: ${change} invalidates failed snapshot permanently`, async () => {
      const env = harness(file)
      try {
        const h = env.returned()
        const first = h.state.restore()
        h.requests[0].reject(new Error('offline'))
        await first
        if (change === 'query') {
          h.keyword.value = 'new'
          h.keyword.value = 'saved'
        }
        if (change === 'account') {
          env.user.accessToken = 'b'
          env.user.accessToken = 'a'
        }
        if (change === 'tenant') {
          env.user.getUserInfo.tenantNo = 'b'
          env.user.getUserInfo.tenantNo = 'a'
        }
        if (change === 'unmount') env.unmount()
        if (change === 'leave') env.leave()
        assert.equal(typeof h.retry, 'function')
        const retry = h.retry()
        await flush()
        if (h.requests.length > 1) await success(h, 1)
        await retry
        assert.ok(h.requests.length <= 2)
        assert.deepEqual(env.scrolls, [])
        assert.deepEqual([...h.expandedIds.value], [])
      } finally {
        env.close()
      }
    })
  test(`${file}: obsolete finally cannot release a newer restore`, async () => {
    const env = harness(file)
    try {
      const h = env.returned()
      const old = h.state.restore()
      h.keyword.value = 'new'
      const fresh = h.state.restore()
      h.requests[0].reject(new Error('old'))
      await old
      assert.equal(h.state.restoring.value, true)
      await success(h, 1)
      await fresh
      assert.equal(h.state.restoring.value, false)
      assert.deepEqual(env.scrolls, [])
    } finally {
      env.close()
    }
  })
  for (const more of [false, true])
    test(`${file}: ordinary ${more ? 'pagination' : 'initial'} retry keeps existing semantics`, async () => {
      const env = harness(file)
      try {
        const h = env.create()
        const failed = h.run(!more)
        h.requests[0].reject(new Error('offline'))
        await failed
        assert.equal(typeof h.retry, 'function')
        const retry = h.retry()
        await flush()
        assert.equal(h.requests[1].params.page, more ? 2 : 1)
        await success(h, 1)
        await retry
        assert.deepEqual(env.scrolls, [])
      } finally {
        env.close()
      }
    })
}

for (const file of ['plan', 'plan-cert']) {
  test(`${file}: absent opt-in retains one-shot CRM default restoration`, async () => {
    const env = harness(file)
    try {
      const h = env.returned(false)
      const first = h.state.restore()
      await success(h, 0)
      h.requests[1].reject(new Error('offline'))
      await first
      const retry = h.retry()
      await success(h, 2)
      await retry
      assert.equal(h.page.value, 2)
      assert.equal(h.requests.length, 3)
      assert.deepEqual([...h.expandedIds.value], [])
      assert.deepEqual(env.scrolls, [])
    } finally {
      env.close()
    }
  })
  for (const invalidation of ['query', 'unmount', 'leave']) {
    test(`${file}: pending retry ${invalidation} cannot restore expansion or scroll`, async () => {
      const env = harness(file)
      try {
        const h = env.returned()
        const first = h.state.restore()
        h.requests[0].reject(new Error('offline'))
        await first
        const retry = h.retry()
        if (invalidation === 'query') {
          h.keyword.value = 'new'
          h.keyword.value = 'saved'
        }
        if (invalidation === 'unmount') env.unmount()
        if (invalidation === 'leave') env.leave()
        await success(h, 1)
        await retry
        assert.equal(h.requests.length, 2)
        assert.deepEqual([...h.expandedIds.value], [])
        assert.deepEqual(env.scrolls, [])
        assert.equal(h.state.restoring.value, false)
      } finally {
        env.close()
      }
    })
  }
}

for (const file of ['plan', 'plan-cert']) {
  test(`${file}: equivalent user info replacement preserves failed return snapshot`, async () => {
    const env = harness(file)
    try {
      const h = env.returned()
      const first = h.state.restore()
      h.requests[0].reject(new Error('offline'))
      await first
      env.user.getUserInfo = { tenantNo: 'a' }
      const retry = h.retry()
      for (let i = 1; i <= 3; i++) await success(h, i)
      await retry
      assert.equal(h.page.value, 3)
      assert.deepEqual([...h.expandedIds.value], ['row-2'])
      assert.deepEqual(env.scrolls, [720])
    } finally {
      env.close()
    }
  })
}