import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { enableAutoUnmount, flushPromises } from '@vue/test-utils'
import { setBundle } from '../../src/app/i18n'
import FormView from '../../src/views/FormView.vue'
import { recordCrumb } from '../../src/state/useBreadcrumbs'
import { toasts } from '../../src/state/useToasts'
import { WIDGET_EVENT } from '../../src/components/form/formContext'
import {
  clone,
  extensionFormSchemaFixture,
  formSchemaFixture,
  langFixture,
  recordFixture,
  rosterFormSchemaFixture,
  rosterRecordFixture,
} from '../fixtures/typed'
import { API, mountApp, queryOf, requestsTo, resetState, type Reply, type Route } from '../helpers'

const BASE = `${API}/acme/demo/widgets`
const RECORD = `${BASE}/1`
const failure = (status: number, message: string) => ({ status, body: { error: { code: 'x', message, details: {} } } })

function routes(overrides: Record<string, Route> = {}): Record<string, Route> {
  return {
    [`GET ${BASE}/schema/form`]: { body: formSchemaFixture },
    [`GET ${RECORD}`]: { body: recordFixture },
    ...overrides,
  }
}

/** A form schema of plain, untabbed fields. */
function flatSchema() {
  const envelope = clone(formSchemaFixture)
  envelope.data.fields = envelope.data.fields.filter((field) => ['name', 'code', 'weight'].includes(field.name))
  return { body: envelope }
}

beforeEach(() => {
  resetState()
})

afterEach(() => {
  document.body.innerHTML = ''
})

enableAutoUnmount(afterEach)

describe('form view', () => {
  it('is the component of the record and create routes', async () => {
    const { wrapper } = await mountApp('/acme/demo/widgets/1', routes())
    expect(wrapper.findComponent(FormView).exists()).toBe(true)
  })

  it('titles a record by its first text field, with the update message as subtitle, and publishes the crumb', async () => {
    const { wrapper } = await mountApp('/acme/demo/widgets/1', routes())
    expect(wrapper.find('h1').text()).toBe('Blue widget')
    expect(wrapper.find('header p').text()).toBe('Editing widget')
    expect(recordCrumb.value).toBe('Blue widget')
    wrapper.unmount()
    expect(recordCrumb.value).toBe('')
  })

  it('titles a new record by the create message and offers no delete', async () => {
    const { wrapper } = await mountApp('/acme/demo/widgets/create', routes())
    expect(wrapper.find('h1').text()).toBe('New widget')
    expect(wrapper.find('header p').exists()).toBe(false)
    expect(wrapper.find('[data-action="delete"]').exists()).toBe(false)
    expect(recordCrumb.value).toBe('New widget')
  })

  it('makes the form the tab panel of the active tab', async () => {
    const { wrapper } = await mountApp('/acme/demo/widgets/1', routes())
    const form = wrapper.find('form')
    expect(form.attributes('role')).toBe('tabpanel')
    expect(form.attributes('id')).toBe('field-panel-0')
    expect(form.attributes('aria-labelledby')).toBe('field-tab-0')
    expect(wrapper.find('#field-tab-0').attributes('aria-controls')).toBe('field-panel-0')
  })

  it('has no tabs and no tab panel role for an untabbed form', async () => {
    const { wrapper } = await mountApp('/acme/demo/widgets/1', routes({ [`GET ${BASE}/schema/form`]: flatSchema() }))
    expect(wrapper.find('[role="tablist"]').exists()).toBe(false)
    expect(wrapper.find('form').attributes('role')).toBeUndefined()
    expect(wrapper.findAll('[data-field]').map((field) => field.attributes('data-field'))).toEqual(['name', 'code', 'weight'])
  })

  it.each([
    ['the record', { [`GET ${RECORD}`]: failure(404, 'Not found') }],
    ['the schema', { [`GET ${BASE}/schema/form`]: failure(500, 'Boom') }],
  ])('announces a failed load of %s and disables saving', async (_label, override) => {
    const { wrapper } = await mountApp('/acme/demo/widgets/1', routes(override))
    expect(wrapper.find('[role="alert"]').text()).toBe('Nie udało się wczytać formularza.')
    expect(wrapper.find('form').exists()).toBe(false)
    if (_label === 'the schema') {
      expect(wrapper.find('[data-action="save"]').attributes('disabled')).toBeDefined()
    }
  })

  it('toasts the generic error when the save cannot reach the server and re-enables saving', async () => {
    const { wrapper, calls } = await mountApp(
      '/acme/demo/widgets/1',
      routes({
        [`PUT ${RECORD}`]: () => {
          throw new TypeError('offline')
        },
      }),
    )
    await wrapper.find('[data-action="save"]').trigger('click')
    await flushPromises()
    expect(requestsTo(calls, 'PUT', RECORD)).toHaveLength(1)
    expect(toasts.value[0]).toMatchObject({ text: 'Nie udało się zapisać zmian. Spróbuj ponownie.', tone: 'danger' })
    expect(wrapper.find('[data-action="save"]').attributes('disabled')).toBeUndefined()
    expect(wrapper.find('[data-action="save"]').text()).toBe('Zapisz')
  })

  it('toasts the server message when a delete is refused and stays on the record', async () => {
    const { wrapper, router } = await mountApp(
      '/acme/demo/widgets/1',
      routes({ [`DELETE ${RECORD}`]: failure(409, 'Widget is in use') }),
      { attach: true },
    )
    await wrapper.find('[data-action="delete"]').trigger('click')
    await flushPromises()
    ;(document.body.querySelector('[data-confirm-dialog] [data-action="confirm"]') as HTMLElement).click()
    await flushPromises()
    expect(toasts.value[0]).toMatchObject({ text: 'Widget is in use', tone: 'danger' })
    expect(router.currentRoute.value.fullPath).toBe('/acme/demo/widgets/1')
  })

  it('keeps a create on the form when the save fails', async () => {
    const { wrapper, router } = await mountApp(
      '/acme/demo/widgets/create',
      routes({ [`POST ${BASE}`]: failure(500, 'Boom') }),
    )
    await wrapper.find('#field-name').setValue('New one')
    await wrapper.find('[data-action="save"]').trigger('click')
    await flushPromises()
    expect(router.currentRoute.value.fullPath).toBe('/acme/demo/widgets/create')
    expect(toasts.value[0]).toMatchObject({ text: 'Boom', tone: 'danger' })
  })

  it('follows the default redirect when the form declares no create redirect', async () => {
    const envelope = clone(formSchemaFixture)
    envelope.data.redirects.create.redirect = ''
    envelope.data.redirects.default = 'acme/demo/widgets/update/:id'
    const { wrapper, router } = await mountApp(
      '/acme/demo/widgets/create',
      routes({
        [`GET ${BASE}/schema/form`]: { body: envelope },
        [`POST ${BASE}`]: { status: 201, body: { data: { id: 5, name: 'X' }, meta: { labels: {} } } },
        [`GET ${BASE}/5`]: { body: { data: { id: 5, name: 'X' }, meta: { labels: {} } } },
      }),
    )
    await wrapper.find('#field-name').setValue('X')
    await wrapper.find('[data-action="save"]').trigger('click')
    await flushPromises()
    expect(router.currentRoute.value.fullPath).toBe('/acme/demo/widgets/5')
  })
})

describe('form view extension context (Phase 10.1, D-05, D-07, D-08, D-09, D-14)', () => {
  const ACTION = `${BASE}/widgets/lookup`
  const SUMMARY = `${BASE}/partials/summary`
  const record = { data: { id: 1, name: 'Blue widget', color: '#0000ff' }, meta: { labels: {} } }
  const summary = { data: { nodes: [{ tag: 'p', children: [{ text: 'Summary' }] }] }, meta: {} }

  class AcmeDemoLookup extends HTMLElement {}
  if (!customElements.get('acme-demo-lookup')) {
    customElements.define('acme-demo-lookup', AcmeDemoLookup)
  }

  /** Records appended plugin scripts; each loads when the test fires it (or at once). */
  function stubHead(autoload = true): HTMLScriptElement[] {
    const scripts: HTMLScriptElement[] = []
    const head = document.head
    const append = head.appendChild.bind(head)
    vi.spyOn(head, 'appendChild').mockImplementation(<T extends Node>(node: T): T => {
      if (node instanceof HTMLScriptElement) {
        scripts.push(node)
        if (autoload) {
          queueMicrotask(() => node.dispatchEvent(new Event('load')))
        }
        return node
      }
      if (node instanceof HTMLLinkElement) {
        return node
      }
      return append(node)
    })
    return scripts
  }

  function extensionRoutes(overrides: Record<string, Route> = {}): Record<string, Route> {
    return {
      [`GET ${BASE}/schema/form`]: { body: extensionFormSchemaFixture },
      [`GET ${RECORD}`]: { body: record },
      [`GET ${SUMMARY}`]: { body: summary },
      ...overrides,
    }
  }

  function widget(root: Element): HTMLElement {
    const element = root.querySelector('acme-demo-lookup')
    if (!(element instanceof HTMLElement)) {
      throw new Error('widget element not mounted')
    }
    return element
  }

  function beforeUnloadPrevented(): boolean {
    const event = new Event('beforeunload', { cancelable: true })
    window.dispatchEvent(event)
    return event.defaultPrevented
  }

  it('provides the values and the schema locale to widgets', async () => {
    stubHead()
    const { wrapper } = await mountApp('/acme/demo/widgets/1', extensionRoutes())
    await flushPromises()
    const element = widget(wrapper.element)
    expect(element.getAttribute('fill-values')).toBe('{"name":"Blue widget"}')
    // The UI speaks Polish; the widget gets the schema's locale.
    expect(element.getAttribute('locale')).toBe('en')
    await wrapper.find('#field-name').setValue('Green widget')
    expect(element.getAttribute('fill-values')).toBe('{"name":"Green widget"}')
  })

  it('falls back to the UI locale when the schema has none', async () => {
    stubHead()
    const schema = clone(extensionFormSchemaFixture)
    schema.data.meta.locale = ''
    const { wrapper } = await mountApp('/acme/demo/widgets/1', extensionRoutes({ [`GET ${BASE}/schema/form`]: { body: schema } }))
    await flushPromises()
    expect(widget(wrapper.element).getAttribute('locale')).toBe('pl')
  })

  it('patches like an edit: the form turns dirty and the field error clears', async () => {
    stubHead()
    const { wrapper, calls } = await mountApp(
      '/acme/demo/widgets/1',
      extensionRoutes({
        [`PUT ${RECORD}`]: {
          status: 422,
          body: { error: { code: 'validation_failed', message: 'Validation failed', details: { name: ['Name is taken.'] } } },
        },
        [`POST ${ACTION}`]: { body: { data: { message: 'Name filled in', fill: { name: 'Catalogue widget' } }, meta: {} } },
      }),
    )
    await flushPromises()
    await wrapper.find('[data-action="save"]').trigger('click')
    await flushPromises()
    expect(requestsTo(calls, 'PUT', RECORD)).toHaveLength(1)
    expect(wrapper.find('#field-name-error').text()).toContain('Name is taken.')
    expect(beforeUnloadPrevented()).toBe(false)

    widget(wrapper.element).dispatchEvent(new CustomEvent(WIDGET_EVENT, { bubbles: true, composed: true }))
    await flushPromises()
    expect((wrapper.find('#field-name').element as HTMLInputElement).value).toBe('Catalogue widget')
    expect(wrapper.find('#field-name-error').exists()).toBe(false)
    expect(beforeUnloadPrevented()).toBe(true)
    // Nothing was saved by the action itself.
    expect(requestsTo(calls, 'PUT', RECORD)).toHaveLength(1)
  })

  it('renders widgets and partials on create', async () => {
    stubHead()
    const { wrapper, calls } = await mountApp('/acme/demo/widgets/create', extensionRoutes())
    await flushPromises()
    const element = widget(wrapper.element)
    expect(element.getAttribute('record-id')).toBe('')
    const [partial] = requestsTo(calls, 'GET', SUMMARY)
    expect(queryOf(partial!).has('id')).toBe(false)
    expect(wrapper.find('[data-partial-field] [data-partial="field"]').text()).toBe('Summary')
    expect(requestsTo(calls, 'GET', RECORD)).toHaveLength(0)
  })

  it('loads the controller assets when the schema arrives and mounts the widget after its script', async () => {
    const scripts = stubHead(false)
    // A fresh URL: the loader remembers scripts across the tests of this file.
    const fresh = '/admin-test/assets/acme/demo/js/form.js?v=1'
    const schema = clone(extensionFormSchemaFixture)
    schema.data.assets.scripts = [fresh]
    let release: (reply: Reply) => void = () => undefined
    const pending = new Promise<Reply>((resolve) => (release = resolve))
    const { wrapper } = await mountApp('/acme/demo/widgets/1', extensionRoutes({ [`GET ${BASE}/schema/form`]: () => pending }))
    expect(scripts).toHaveLength(0)

    release({ body: schema })
    await flushPromises()
    expect(scripts.map((script) => script.getAttribute('src'))).toEqual([fresh])
    expect(wrapper.find('[data-widget-host]').attributes('aria-busy')).toBe('true')
    expect(wrapper.element.querySelector('acme-demo-lookup')).toBeNull()

    scripts[0]!.dispatchEvent(new Event('load'))
    await flushPromises()
    expect(widget(wrapper.element).getAttribute('record-id')).toBe('1')
    expect(wrapper.find('[data-widget-host]').attributes('aria-busy')).toBeUndefined()
  })
})

describe('forbidden save on the form (UI-SPEC S6, D-27)', () => {
  const FALLBACK = 'You do not have permission to make this change. Nothing was saved.'
  const strings = {
    'backend::lang.form.forbidden': { other: FALLBACK },
    'backend::lang.form.error_title': { other: 'The record could not be saved.' },
    'backend::lang.form.error_fields': { one: 'Correct :count field.', other: 'Correct :count fields.' },
  }
  type Mounted = Awaited<ReturnType<typeof mountApp>>['wrapper']
  const refused = (message: string, details: Record<string, string[]> = {}): Reply => ({
    status: 403,
    body: { error: { code: 'forbidden', message, details } },
  })
  const banner = (wrapper: Mounted) => wrapper.find('[data-forbidden-banner]')
  const name = (wrapper: Mounted) => wrapper.find<HTMLInputElement>('#field-name')
  const code = (wrapper: Mounted) => wrapper.find<HTMLInputElement>('#field-code')
  async function save(wrapper: Mounted): Promise<void> {
    await wrapper.find('[data-action="save"]').trigger('click')
    await flushPromises()
  }

  beforeEach(() => {
    setBundle({ ...langFixture.data, ...strings }, 'en')
  })

  it('shows the banner with the server message, or the framework text without one', async () => {
    const withMessage = await mountApp('/acme/demo/widgets/1', routes({ [`GET ${BASE}/schema/form`]: flatSchema(), [`PUT ${RECORD}`]: refused('Only makers may rename widgets.') }))
    await name(withMessage.wrapper).setValue('Renamed')
    await save(withMessage.wrapper)
    expect(banner(withMessage.wrapper).attributes('role')).toBe('alert')
    expect(banner(withMessage.wrapper).text()).toBe('Only makers may rename widgets.')
    expect(toasts.value).toHaveLength(0)
    withMessage.wrapper.unmount()

    const bare = await mountApp('/acme/demo/widgets/1', routes({ [`GET ${BASE}/schema/form`]: flatSchema(), [`PUT ${RECORD}`]: refused('') }))
    await name(bare.wrapper).setValue('Renamed')
    await save(bare.wrapper)
    expect(banner(bare.wrapper).text()).toBe(FALLBACK)
    expect(bare.wrapper.find('[aria-invalid="true"]').exists()).toBe(false)
  })

  it('puts details on their fields, focuses the first one and shows no 422 banner', async () => {
    const { wrapper } = await mountApp(
      '/acme/demo/widgets/1',
      routes({ [`GET ${BASE}/schema/form`]: flatSchema(), [`PUT ${RECORD}`]: refused('Refused.', { code: ['This code is reserved.'], name: ['This name is reserved.'] }) }),
      { attach: true },
    )
    await code(wrapper).setValue('W-99')
    await save(wrapper)
    expect(banner(wrapper).text()).toBe('Refused.')
    expect(wrapper.find('[data-error-banner]').exists()).toBe(false)
    expect(name(wrapper).attributes('aria-invalid')).toBe('true')
    expect(code(wrapper).attributes('aria-invalid')).toBe('true')
    expect(wrapper.text()).toContain('This name is reserved.')
    expect(wrapper.text()).toContain('This code is reserved.')
    // name comes first in the form, so it takes the focus.
    expect(document.activeElement).toBe(name(wrapper).element)
  })

  it('keeps the typed values and the dirty state: nothing was saved', async () => {
    const { wrapper, calls } = await mountApp('/acme/demo/widgets/1', routes({ [`GET ${BASE}/schema/form`]: flatSchema(), [`PUT ${RECORD}`]: refused('Refused.') }), { attach: true })
    await name(wrapper).setValue('Typed by hand')
    await save(wrapper)
    expect(name(wrapper).element.value).toBe('Typed by hand')
    expect(requestsTo(calls, 'GET', RECORD)).toHaveLength(1)
    // Leaving still asks, because the form is dirty.
    await wrapper.find('[data-action="cancel"]').trigger('click')
    await flushPromises()
    expect(document.body.querySelector('[data-confirm-dialog]')).not.toBeNull()
  })

  it('clears the banner when the next save starts, and shows nothing after a save that succeeds', async () => {
    let attempt = 0
    const saved = clone(recordFixture)
    saved.data.name = 'Second try'
    const { wrapper } = await mountApp(
      '/acme/demo/widgets/1',
      routes({
        [`GET ${BASE}/schema/form`]: flatSchema(),
        [`PUT ${RECORD}`]: () => {
          attempt += 1
          return attempt === 1 ? refused('Refused.', { name: ['Reserved.'] }) : { body: saved }
        },
      }),
    )
    await name(wrapper).setValue('First try')
    await save(wrapper)
    expect(banner(wrapper).exists()).toBe(true)
    // Editing does not dismiss it: only the next save attempt does.
    await name(wrapper).setValue('Second try')
    expect(banner(wrapper).exists()).toBe(true)
    await save(wrapper)
    expect(attempt).toBe(2)
    expect(banner(wrapper).exists()).toBe(false)
    expect(wrapper.find('[role="alert"]').exists()).toBe(false)
    expect(name(wrapper).attributes('aria-invalid')).toBeUndefined()
  })

  it('replaces the banner with the 422 banner when the next save fails validation', async () => {
    let attempt = 0
    const { wrapper } = await mountApp(
      '/acme/demo/widgets/1',
      routes({
        [`GET ${BASE}/schema/form`]: flatSchema(),
        [`PUT ${RECORD}`]: () => {
          attempt += 1
          return attempt === 1
            ? refused('Refused.')
            : { status: 422, body: { error: { code: 'validation_failed', message: 'Validation failed', details: { name: ['Too short.'] } } } }
        },
      }),
    )
    await name(wrapper).setValue('x')
    await save(wrapper)
    expect(banner(wrapper).exists()).toBe(true)
    await save(wrapper)
    expect(banner(wrapper).exists()).toBe(false)
    expect(wrapper.find('[data-error-banner]').text()).toContain('Correct 1 field.')
  })

  it('refuses a create the same way and stays on the create route', async () => {
    const { wrapper, router } = await mountApp('/acme/demo/widgets/create', routes({ [`GET ${BASE}/schema/form`]: flatSchema(), [`POST ${BASE}`]: refused('You may not add widgets.') }))
    await name(wrapper).setValue('Brand new')
    await save(wrapper)
    expect(banner(wrapper).text()).toBe('You may not add widgets.')
    expect(router.currentRoute.value.name).toBe('create')
    expect(name(wrapper).element.value).toBe('Brand new')
  })

  it('shows a refused delete as a danger toast, not as the banner, and stays on the record', async () => {
    const { wrapper, router } = await mountApp('/acme/demo/widgets/1', routes({ [`GET ${BASE}/schema/form`]: flatSchema(), [`DELETE ${RECORD}`]: refused('This widget is in use.') }), { attach: true })
    await wrapper.find('[data-action="delete"]').trigger('click')
    await flushPromises()
    ;(document.body.querySelector('[data-confirm-dialog] [data-action="confirm"]') as HTMLElement).click()
    await flushPromises()
    expect(toasts.value.map((toast) => [toast.text, toast.tone])).toEqual([['This widget is in use.', 'danger']])
    expect(banner(wrapper).exists()).toBe(false)
    expect(router.currentRoute.value.name).toBe('record')
  })
})

describe('password and preset on the form (UI-SPEC S7, D-19, D-27 G7)', () => {
  const PEOPLE = `${API}/acme/roster/people`
  const PERSON = `${PEOPLE}/1`
  type Mounted = Awaited<ReturnType<typeof mountApp>>['wrapper']
  const field = (wrapper: Mounted, name: string) => wrapper.find<HTMLInputElement>(`#field-${name}`)
  function people(overrides: Record<string, Route> = {}): Record<string, Route> {
    return {
      [`GET ${PEOPLE}/schema/form`]: { body: rosterFormSchemaFixture },
      [`GET ${PERSON}`]: { body: rosterRecordFixture },
      [`GET ${PEOPLE}/partials/status`]: { body: { data: { nodes: [] }, meta: {} } },
      ...overrides,
    }
  }
  async function save(wrapper: Mounted): Promise<void> {
    await wrapper.find('[data-action="save"]').trigger('click')
    await flushPromises()
  }

  beforeEach(() => {
    setBundle(
      { ...langFixture.data, 'backend::lang.form.show_password': { other: 'Show password' }, 'backend::lang.form.hide_password': { other: 'Hide password' } },
      'en',
    )
  })

  it('loads both password fields empty and masked, and puts no password into the page', async () => {
    // The guarantee is the server's: a record response never carries a
    // password (the framework test T-12.1-10). The form adds none of its own.
    const { wrapper } = await mountApp('/acme/roster/people/1', people())
    for (const name of ['password', 'password_confirmation']) {
      expect(field(wrapper, name).attributes('type')).toBe('password')
      expect(field(wrapper, name).element.value).toBe('')
      expect(field(wrapper, name).attributes('autocomplete')).toBe('new-password')
    }
    expect('password' in rosterRecordFixture.data).toBe(false)
  })

  it('leaves the password out of an update that does not type one', async () => {
    const { wrapper, calls } = await mountApp('/acme/roster/people/1', people({ [`PUT ${PERSON}`]: { body: rosterRecordFixture } }))
    await field(wrapper, 'name').setValue('Ada King')
    await save(wrapper)
    const body = (await requestsTo(calls, 'PUT', PERSON)[0]!.clone().json()) as Record<string, unknown>
    expect(body.name).toBe('Ada King')
    expect('password' in body).toBe(false)
    expect('password_confirmation' in body).toBe(false)
  })

  it('sends the typed pair and clears and hides both fields after the save', async () => {
    const { wrapper, calls } = await mountApp('/acme/roster/people/1', people({ [`PUT ${PERSON}`]: { body: rosterRecordFixture } }))
    await field(wrapper, 'password').setValue('new-secret-1')
    await field(wrapper, 'password_confirmation').setValue('new-secret-1')
    await wrapper.find('[data-field="password"] [data-password-toggle]').trigger('click')
    expect(field(wrapper, 'password').attributes('type')).toBe('text')
    await save(wrapper)
    const body = (await requestsTo(calls, 'PUT', PERSON)[0]!.clone().json()) as Record<string, unknown>
    expect(body.password).toBe('new-secret-1')
    expect(body.password_confirmation).toBe('new-secret-1')
    for (const name of ['password', 'password_confirmation']) {
      expect(field(wrapper, name).element.value).toBe('')
      expect(field(wrapper, name).attributes('type')).toBe('password')
    }
    // A second save sends no password again.
    await field(wrapper, 'name').setValue('Ada King')
    await save(wrapper)
    const second = (await requestsTo(calls, 'PUT', PERSON)[1]!.clone().json()) as Record<string, unknown>
    expect('password' in second).toBe(false)
  })

  it('keeps the typed password when the save is refused', async () => {
    const { wrapper } = await mountApp(
      '/acme/roster/people/1',
      people({ [`PUT ${PERSON}`]: { status: 403, body: { error: { code: 'forbidden', message: 'Refused.', details: { password: ['Not allowed.'] } } } } }),
    )
    await field(wrapper, 'password').setValue('new-secret-1')
    await field(wrapper, 'password_confirmation').setValue('new-secret-1')
    await save(wrapper)
    expect(wrapper.find('[data-forbidden-banner]').text()).toBe('Refused.')
    expect(field(wrapper, 'password').element.value).toBe('new-secret-1')
    expect(field(wrapper, 'password').attributes('aria-invalid')).toBe('true')
  })

  it('on create, sends a password that was typed and cleared as empty, and leaves an untouched one to the server rules', async () => {
    const invalid = { status: 422, body: { error: { code: 'validation_failed', message: 'Validation failed', details: { password: ['The password is required.'] } } } }
    const { wrapper, calls } = await mountApp('/acme/roster/people/create', people({ [`POST ${PEOPLE}`]: invalid }))
    await field(wrapper, 'name').setValue('Grace Hopper')
    await save(wrapper)
    const untouched = (await requestsTo(calls, 'POST', PEOPLE)[0]!.clone().json()) as Record<string, unknown>
    expect(untouched.password ?? '').toBe('')
    expect(wrapper.text()).toContain('The password is required.')
    expect(field(wrapper, 'password').attributes('aria-invalid')).toBe('true')

    await field(wrapper, 'password').setValue('typed')
    await field(wrapper, 'password').setValue('')
    await save(wrapper)
    const cleared = (await requestsTo(calls, 'POST', PEOPLE)[1]!.clone().json()) as Record<string, unknown>
    expect(cleared.password).toBe('')
  })

  it('fills a preset target on create only, and stops at the first manual edit', async () => {
    const create = await mountApp('/acme/roster/people/create', people())
    await field(create.wrapper, 'name').setValue('Zażółć gęślą')
    expect(field(create.wrapper, 'slug').element.value).toBe('za-g-l')
    await field(create.wrapper, 'slug').setValue('by-hand')
    await field(create.wrapper, 'name').setValue('Something Else')
    expect(field(create.wrapper, 'slug').element.value).toBe('by-hand')
    // Clearing the target by hand is an edit too: it stays empty.
    await field(create.wrapper, 'slug').setValue('')
    await field(create.wrapper, 'name').setValue('Third Name')
    expect(field(create.wrapper, 'slug').element.value).toBe('')
    create.wrapper.unmount()

    const update = await mountApp('/acme/roster/people/1', people())
    await field(update.wrapper, 'name').setValue('Ada King')
    expect(field(update.wrapper, 'slug').element.value).toBe('ada-lovelace')
  })
})