// RelationChildModal (Phase 12.2, D-11, D-17; UI-SPEC section 4) mounted on
// its own: titles and submit labels per mode, the loading skeleton and the
// load failure alert, a 422 that switches to the invalid field's tab and
// focuses it, the 404 "gone" flow, delete with a confirmation, the modal's
// own session key next to the form's on every call, and the confirmation
// before a dirty close. Texts come from the relation schema fixture.
import { afterEach, beforeEach, describe, expect, it } from 'vitest'
import { enableAutoUnmount, flushPromises, mount } from '@vue/test-utils'
import RelationChildModal from '../../src/components/relation/RelationChildModal.vue'
import { CHILD_SESSION_HEADER, SESSION_HEADER } from '../../src/app/sessionKey'
import { toasts } from '../../src/state/useToasts'
import { deferredRelationSchemaFixture } from '../fixtures/typed'
import { API, mockApi, requestsTo, resetState, wait, type Route } from '../helpers'

const source = { vendor: 'acme', plugin: 'demo', controller: 'gadgets' }
const RECORDS = `${API}/acme/demo/gadgets/0/relations/parts/records`
const FORM_KEY = 'f'.repeat(43)
const schema = deferredRelationSchemaFixture.parts.data
const record = { data: { id: 9, label: 'Bolt', notes: 'Steel' }, meta: { labels: {} } }

function body(): HTMLElement {
  return document.body.querySelector<HTMLElement>('[data-relation-child-modal]')!
}

function setInput(selector: string, value: string): void {
  const input = body().querySelector<HTMLInputElement | HTMLTextAreaElement>(selector)!
  input.value = value
  input.dispatchEvent(new Event('input'))
}

function click(selector: string): void {
  ;(document.body.querySelector(selector) as HTMLElement).click()
}

async function open(mode: 'create' | 'update' | 'preview', routes: Record<string, Route> = {}, extra: Record<string, unknown> = {}) {
  const calls = mockApi(routes)
  const wrapper = mount(RelationChildModal, {
    props: {
      open: true,
      source,
      ownerId: 0,
      relation: 'parts',
      schema,
      mode,
      childId: mode === 'create' ? null : 9,
      sessionKey: FORM_KEY,
      canDelete: true,
      ...extra,
    },
    attachTo: document.body,
  })
  await flushPromises()
  return { wrapper, calls }
}

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

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

enableAutoUnmount(afterEach)

describe('titles and modes', () => {
  it('names each mode with its title and submit label', async () => {
    const create = await open('create')
    expect(body().dataset.mode).toBe('create')
    expect(body().querySelector('h2')!.textContent).toBe('New record')
    expect(body().querySelector('[data-action="save-child"]')!.textContent).toContain('Create record')
    expect(body().querySelector('[data-action="delete-child"]')).toBeNull()
    create.wrapper.unmount()
    document.body.innerHTML = ''

    const update = await open('update', { [`GET ${RECORDS}/9`]: { body: record } })
    expect(body().querySelector('h2')!.textContent).toBe('Edit record')
    expect(body().querySelector('[data-action="save-child"]')!.textContent).toContain('Save record')
    expect(body().querySelector('[data-action="delete-child"]')).not.toBeNull()
    expect(body().querySelector<HTMLInputElement>('#child-parts-label')!.value).toBe('Bolt')
    update.wrapper.unmount()
    document.body.innerHTML = ''

    await open('preview', { [`GET ${RECORDS}/9`]: { body: record } })
    expect(body().querySelector('h2')!.textContent).toBe('Record preview')
    expect(body().querySelector('[data-action="save-child"]')).toBeNull()
    const input = body().querySelector<HTMLInputElement>('#child-parts-label')!
    expect(input.readOnly || input.disabled || input.closest('fieldset')?.disabled).toBeTruthy()
  })

  it('shows a skeleton while the child loads and an alert when it cannot be read', async () => {
    let release: (() => void) | null = null
    const slow: Route = () =>
      new Promise((resolve) => {
        release = () => resolve({ body: record })
      })
    const { wrapper } = await open('update', { [`GET ${RECORDS}/9`]: slow })
    expect(body().querySelector('[data-child-loading]')).not.toBeNull()
    release!()
    await flushPromises()
    expect(body().querySelector('[data-child-loading]')).toBeNull()
    wrapper.unmount()
    document.body.innerHTML = ''

    await open('update', { [`GET ${RECORDS}/9`]: { status: 500, body: { error: { code: 'error', message: 'Boom', details: {} } } } })
    const alert = body().querySelector('[data-child-load-failed]')!
    expect(alert).not.toBeNull()
    expect(body().querySelector('[data-action="save-child"]')?.hasAttribute('disabled') ?? true).toBe(true)
  })
})

describe('saving', () => {
  it('sends both keys, the modal key new on every open, and closes with a toast', async () => {
    const { wrapper, calls } = await open('create', { [`POST ${RECORDS}`]: { status: 201, body: record } })
    setInput('#child-parts-label', 'Bolt')
    await flushPromises()
    click('[data-action="save-child"]')
    await flushPromises()
    const [post] = requestsTo(calls, 'POST', RECORDS)
    expect(post!.headers.get(SESSION_HEADER)).toBe(FORM_KEY)
    const childKey = post!.headers.get(CHILD_SESSION_HEADER) ?? ''
    expect(childKey).toMatch(/^[A-Za-z0-9_-]{43}$/)
    expect(childKey).not.toBe(FORM_KEY)
    expect(await post!.clone().json()).toEqual({ label: 'Bolt' })
    expect(wrapper.emitted('update:open')).toEqual([[false]])
    expect(wrapper.emitted('changed')).toEqual([['created']])
    expect(toasts.value.at(-1)).toMatchObject({ text: 'Record created', tone: 'success' })

    await wrapper.setProps({ open: false })
    await wrapper.setProps({ open: true })
    await flushPromises()
    setInput('#child-parts-label', 'Nut')
    click('[data-action="save-child"]')
    await flushPromises()
    const second = requestsTo(calls, 'POST', RECORDS)[1]!
    expect(second.headers.get(CHILD_SESSION_HEADER)).not.toBe(childKey)
  })

  it('switches to the tab of the first invalid field and focuses it on a 422', async () => {
    await open('create', {
      [`POST ${RECORDS}`]: { status: 422, body: { error: { code: 'validation_failed', message: 'Invalid', details: { notes: ['The notes field is required.'] } } } },
    })
    setInput('#child-parts-label', 'Bolt')
    click('[data-action="save-child"]')
    await flushPromises()
    await wait(0)
    const notes = body().querySelector<HTMLTextAreaElement>('#child-parts-notes')
    expect(notes).not.toBeNull()
    expect(document.activeElement).toBe(notes)
    expect(body().textContent).toContain('The notes field is required.')
    expect(body().querySelector('[role="tab"][aria-selected="true"]')?.textContent).toContain('Details')
  })

  it('closes, toasts child_gone and emits gone on a 404', async () => {
    const { wrapper } = await open('update', {
      [`GET ${RECORDS}/9`]: { body: record },
      [`PUT ${RECORDS}/9`]: { status: 404, body: { error: { code: 'not_found', message: 'Not found', details: {} } } },
    })
    setInput('#child-parts-label', 'Gone')
    click('[data-action="save-child"]')
    await flushPromises()
    expect(wrapper.emitted('update:open')).toEqual([[false]])
    expect(wrapper.emitted('gone')).toHaveLength(1)
    expect(toasts.value.at(-1)).toMatchObject({ text: 'backend::lang.relation.child_gone', tone: 'danger' })
  })

  it('deletes the child after a confirmation', async () => {
    const { wrapper, calls } = await open('update', {
      [`GET ${RECORDS}/9`]: { body: record },
      [`POST ${API}/acme/demo/gadgets/0/relations/parts/delete`]: { body: { data: { deleted: 1 }, meta: {} } },
    })
    click('[data-action="delete-child"]')
    await flushPromises()
    const confirm = document.body.querySelector('[data-confirm-dialog]')!
    expect(confirm.textContent).toContain('Delete this record? This cannot be undone.')
    click('[data-confirm-dialog] [data-action="confirm"]')
    await flushPromises()
    const [del] = requestsTo(calls, 'POST', `${API}/acme/demo/gadgets/0/relations/parts/delete`)
    expect(await del!.clone().json()).toEqual({ ids: [9] })
    expect(del!.headers.get(SESSION_HEADER)).toBe(FORM_KEY)
    expect(wrapper.emitted('changed')).toEqual([['deleted']])
    expect(toasts.value.at(-1)).toMatchObject({ text: 'Deleted 1 record' })
  })

  it('asks before closing with unsaved changes', async () => {
    const { wrapper } = await open('create')
    click('[data-action="close"]')
    await flushPromises()
    expect(document.body.querySelector('[data-confirm-dialog]')).toBeNull()
    expect(wrapper.emitted('update:open')).toEqual([[false]])

    await wrapper.setProps({ open: false })
    await wrapper.setProps({ open: true })
    await flushPromises()
    setInput('#child-parts-label', 'Draft')
    await flushPromises()
    click('[data-relation-child-modal] [data-action="close"]')
    await flushPromises()
    expect(document.body.querySelector('[data-confirm-dialog]')).not.toBeNull()
    click('[data-confirm-dialog] [data-action="cancel"]')
    await flushPromises()
    expect(wrapper.emitted('update:open')).toHaveLength(1)
    click('[data-relation-child-modal] [data-action="close"]')
    await flushPromises()
    click('[data-confirm-dialog] [data-action="confirm"]')
    await flushPromises()
    expect(wrapper.emitted('update:open')).toEqual([[false], [false]])
  })
})