import { QueryClientProvider } from '@tanstack/react-query'
import { fireEvent, render, screen, waitFor, within } from '@testing-library/react'
import { afterEach, beforeEach, describe, expect, it, vi, type Mock } from 'vitest'
import { ApiProvider, createApiClient, createQueryClient, createVerifiedSession } from '../api/index.ts'
import { createNetworkStatus } from '../pwa/networkStatus.ts'
import { HOUSEHOLD_SETTINGS } from '../test/ApiProviders.tsx'
import { declaredStyle } from '../test/cssRules.ts'
import { errorResponse, fakeLocation, jsonResponse, ME } from '../test/fetchStub.ts'
import { mockViewport } from '../test/matchMedia.ts'
import { PlanPage } from './PlanPage.tsx'

const THIS_WEEK = '/api/v1/plans/2026-10-05'
const NEXT_WEEK = '/api/v1/plans/2026-10-12'
const DRAFT = `${THIS_WEEK}/draft`
const JOB = '/api/v1/jobs/j1'

const DAYS = ['2026-10-05', '2026-10-06', '2026-10-07', '2026-10-08', '2026-10-09', '2026-10-10', '2026-10-11']
const NAMES = ['Beef tacos', 'Spaghetti bolognese', 'Crock pot tikka masala', 'Chicken stir-fry', 'Pizza night', 'Korean beef bowls', 'Sheet-pan salmon']

// planBody is the plan of the week of Oct 5 as GET /api/v1/plans/{weekStart}
// sends it: Wednesday's crock-pot tikka masala and Saturday's bowls are
// Quest-log picks, and the tikka masala must start by 1:30 pm New York time
// to be ready for 5:30 pm dinner.
function planBody(status: string, names = NAMES) {
  return {
    id: 'plan-1',
    week_start: '2026-10-05',
    week_label: 'Week 41 · Oct 5 – 11',
    status,
    ai_note: 'I mixed 5 of your regulars with 2 from your Quest log. Tap any day to swap it.',
    calendar_synced_at: status === 'draft' ? null : '2026-10-04T15:00:00Z',
    days: DAYS.map((date, i) => ({
      date,
      dinner: {
        id: `d${i}`,
        name: names[i],
        photo: null,
        minutes: i === 2 ? 240 : 30,
        method: i === 2 ? 'crockpot' : 'stovetop',
        origin: i === 2 || i === 5 ? 'side_quest' : 'regular',
      },
      is_new: i === 2 || i === 5,
      start_by: i === 2 ? '2026-10-07T13:30:00-04:00' : null,
    })),
    updated_at: '2026-10-04T15:00:00Z',
  }
}

// draftJob is job j1 drafting the week of Oct 5 into plan planId: a
// redraft keeps the plan's id.
function draftJob(status: string, error: string | null = null, planId = 'plan-1') {
  const result = status === 'succeeded' ? { week_start: '2026-10-05', plan_id: planId } : null
  return { id: 'j1', kind: 'draft_week', status, result, error }
}

type Responder = (init: RequestInit | undefined) => Response

// stubServer answers "METHOD path" requests from responders, with /me and
// the household settings; any other request fails the test.
function stubServer(responders: Record<string, Responder>) {
  const all: Record<string, Responder> = {
    'GET /api/v1/me': () => jsonResponse(200, ME),
    'GET /api/v1/settings/household': () => jsonResponse(200, HOUSEHOLD_SETTINGS),
    ...responders,
  }
  const fetchMock = vi.fn<typeof fetch>((input, init) => {
    const key = `${init?.method ?? 'GET'} ${String(input)}`
    const respond = Object.hasOwn(all, key) ? all[key] : undefined
    if (respond === undefined) throw new Error(`unexpected fetch: ${key}`)
    return Promise.resolve(respond(init))
  })
  vi.stubGlobal('fetch', fetchMock)
  return fetchMock
}

// posts lists the POSTs sent, as "path body".
function posts(fetchMock: Mock<typeof fetch>) {
  return fetchMock.mock.calls
    .filter(([, init]) => init?.method === 'POST')
    .map(([input, init]) => `${String(input)} ${String(init?.body)}`)
}

// renderPage loads /me (for the CSRF token every write needs) and renders
// the Plan page.
async function renderPage() {
  const api = createApiClient(fakeLocation('/plan'), createNetworkStatus(window), createVerifiedSession(localStorage))
  await api.loadMe()
  return render(
    <ApiProvider client={api}>
      <QueryClientProvider client={createQueryClient()}>
        <PlanPage />
      </QueryClientProvider>
    </ApiProvider>,
  )
}

// Wednesday Oct 7, noon in New York: before Friday's 09:00 plan_draft, so
// the page opens on this week.
beforeEach(() => {
  mockViewport(390)
  vi.useFakeTimers({ toFake: ['Date'] })
  vi.setSystemTime(new Date('2026-10-07T16:00:00Z'))
})

afterEach(() => {
  vi.useRealTimers()
  vi.unstubAllGlobals()
  Reflect.deleteProperty(window, 'matchMedia')
})

function tile(kicker: string) {
  return screen.getByText(kicker).closest('li')!
}

describe('PlanPage', () => {
  it('renders mock 1f for a draft: title, Draft tag, the assistant note and the 2-column grid', async () => {
    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')) })
    await renderPage()

    expect(await screen.findByText('Beef tacos')).toBeInTheDocument()
    const title = screen.getByRole('heading', { level: 1, name: 'Oct 5 – 11' })
    expect(declaredStyle(title).fontSize).toBe('26px')
    expect(screen.getByText('Week 41')).toBeInTheDocument()
    const tag = screen.getByText('Draft')
    expect(declaredStyle(tag).background).toBe('var(--color-accent-100)')
    expect(declaredStyle(tag).color).toBe('var(--color-accent-800)')

    // The assistant: a 32 px grape "Q" avatar beside the plan's ai_note.
    const avatar = screen.getByText('Q')
    expect(declaredStyle(avatar).width).toBe('32px')
    expect(declaredStyle(avatar).background).toBe('var(--color-accent)')
    expect(screen.getByText('I mixed 5 of your regulars with 2 from your Quest log. Tap any day to swap it.')).toBeInTheDocument()

    // Seven day tiles, Monday to Sunday, then the "+ Rebuild week" tile.
    const grid = screen.getByRole('list', { name: 'Dinners this week' })
    expect(declaredStyle(grid).gridTemplateColumns).toBe('repeat(2, minmax(0, 1fr))')
    const items = within(grid).getAllByRole('listitem')
    expect(items).toHaveLength(8)
    expect(items.slice(0, 7).map((item) => item.firstChild!.textContent)).toEqual([
      'MON',
      'TUE',
      'WED · NEW',
      'THU',
      'FRI',
      'SAT · NEW',
      'SUN',
    ])
    expect(within(items[7]!).getByRole('button', { name: 'Rebuild week' })).toBeInTheDocument()
    const monday = tile('MON')
    expect(declaredStyle(monday).minHeight).toBe('86px')
    expect(declaredStyle(monday).borderRadius).toBe('22px')
    expect(declaredStyle(monday).background).toBe('var(--color-surface)')
    expect(declaredStyle(within(monday).getByText('Beef tacos')).fontFamily).toBe('var(--font-heading)')
    expect(declaredStyle(within(monday).getByText('Beef tacos')).fontSize).toBe('15px')
  })

  it('highlights Quest-log picks in teal with the NEW kicker', async () => {
    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')) })
    await renderPage()

    await screen.findByText('WED · NEW')
    const wednesday = tile('WED · NEW')
    expect(declaredStyle(wednesday).background).toBe('var(--color-accent-2-300)')
    expect(declaredStyle(within(wednesday).getByText('WED · NEW')).color).toBe('var(--color-accent-2-900)')
    expect(declaredStyle(tile('SAT · NEW')).background).toBe('var(--color-accent-2-300)')
    // A Regular stays on the surface, with no NEW.
    expect(declaredStyle(tile('THU')).background).toBe('var(--color-surface)')
    expect(screen.queryByText('THU · NEW')).not.toBeInTheDocument()
  })

  it('shows a crock-pot dinner its start-by time in the household zone, and no other dinner one', async () => {
    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')) })
    await renderPage()

    expect(await screen.findByText('Start by 1:30 pm')).toBeInTheDocument()
    expect(within(tile('WED · NEW')).getByText('Start by 1:30 pm')).toBeInTheDocument()
    expect(screen.getAllByText(/^Start by/)).toHaveLength(1)
  })

  it.each([
    ['synced', 'Synced', 'var(--color-accent-2-200)'],
    ['changed', 'Changes not pushed', 'var(--color-accent-100)'],
  ])('tags a %s plan "%s"', async (status, label, background) => {
    stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody(status)) })
    await renderPage()

    const tag = await screen.findByText(label)
    expect(declaredStyle(tag).background).toBe(background)
    expect(screen.queryByText('Draft')).not.toBeInTheDocument()
  })

  it('offers Push to Calendar unavailable, with a tooltip saying why', async () => {
    const fetchMock = stubServer({ [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')) })
    await renderPage()

    const push = await screen.findByRole('button', { name: 'Looks good — push to Calendar' })
    expect(push).toHaveAttribute('aria-disabled', 'true')
    expect(push).toHaveAccessibleDescription('Push to Calendar arrives once Google Calendar can be connected.')
    expect(screen.getByRole('tooltip', { hidden: true })).toHaveTextContent('Push to Calendar arrives once Google Calendar can be connected.')
    expect(declaredStyle(push).minHeight).toBe('50px')
    fireEvent.click(push)
    expect(posts(fetchMock)).toEqual([])
  })

  it('rebuilds a draft at once, showing skeleton tiles until the new plan is read', async () => {
    let plan = planBody('draft')
    let job = draftJob('running')
    const fetchMock = stubServer({
      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, plan),
      [`POST ${DRAFT}`]: () => jsonResponse(202, { jobId: 'j1' }),
      [`GET ${JOB}`]: () => jsonResponse(200, job),
    })
    await renderPage()

    fireEvent.click(await screen.findByRole('button', { name: 'Rebuild week' }))
    expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
    await waitFor(() => expect(posts(fetchMock)).toEqual([`${DRAFT} {}`]))
    expect(await screen.findByRole('region', { name: 'Drafting this week' })).toHaveAttribute('aria-busy', 'true')
    expect(screen.getAllByTestId('skeleton-tile')).toHaveLength(7)
    expect(screen.queryByText('Beef tacos')).not.toBeInTheDocument()

    plan = planBody('draft', ['Lasagna', ...NAMES.slice(1)])
    job = draftJob('succeeded')
    expect(await screen.findByText('Lasagna', {}, { timeout: 3000 })).toBeInTheDocument()
    expect(screen.queryByTestId('skeleton-tile')).not.toBeInTheDocument()
  })

  it.each(['synced', 'changed'])('asks before rebuilding a %s plan, and sends confirm', async (status) => {
    const fetchMock = stubServer({
      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody(status)),
      [`POST ${DRAFT}`]: () => jsonResponse(202, { jobId: 'j1' }),
      [`GET ${JOB}`]: () => jsonResponse(200, draftJob('running')),
    })
    await renderPage()

    fireEvent.click(await screen.findByRole('button', { name: 'Rebuild week' }))
    const dialog = await screen.findByRole('dialog', { name: 'Rebuild this week?' })
    expect(dialog).toHaveTextContent('already pushed to Calendar')
    fireEvent.click(within(dialog).getByRole('button', { name: 'Keep this plan' }))
    await waitFor(() => expect(screen.queryByRole('dialog')).not.toBeInTheDocument())
    expect(posts(fetchMock)).toEqual([])

    fireEvent.click(screen.getByRole('button', { name: 'Rebuild week' }))
    fireEvent.click(within(await screen.findByRole('dialog')).getByRole('button', { name: 'Rebuild week' }))
    await waitFor(() => expect(posts(fetchMock)).toEqual([`${DRAFT} {"confirm":true}`]))
    expect(await screen.findByRole('region', { name: 'Drafting this week' })).toBeInTheDocument()
  })

  it('offers "Draft this week" with no plan, and shows skeleton tiles while it drafts', async () => {
    let plan: unknown = null
    let job = draftJob('queued')
    const fetchMock = stubServer({
      [`GET ${THIS_WEEK}`]: () => (plan === null ? errorResponse(404, 'not_found') : jsonResponse(200, plan)),
      [`POST ${DRAFT}`]: () => jsonResponse(202, { jobId: 'j1' }),
      [`GET ${JOB}`]: () => jsonResponse(200, job),
    })
    await renderPage()

    expect(await screen.findByRole('heading', { name: 'Nothing planned yet' })).toBeInTheDocument()
    expect(screen.getByRole('heading', { level: 1, name: 'Oct 5 – 11' })).toBeInTheDocument()
    expect(screen.queryByText('Draft')).not.toBeInTheDocument()
    expect(screen.queryByRole('button', { name: 'Looks good — push to Calendar' })).not.toBeInTheDocument()

    fireEvent.click(screen.getByRole('button', { name: 'Draft this week' }))
    expect(await screen.findByRole('region', { name: 'Drafting this week' })).toBeInTheDocument()
    expect(screen.getAllByTestId('skeleton-tile')).toHaveLength(7)
    expect(screen.getByText('Drafting your week…')).toBeInTheDocument()
    expect(posts(fetchMock)).toEqual([`${DRAFT} {}`])

    plan = planBody('draft')
    job = draftJob('succeeded')
    expect(await screen.findByText('Beef tacos', {}, { timeout: 3000 })).toBeInTheDocument()
    expect(screen.getByText('Draft')).toBeInTheDocument()
  })

  it('shows a failed draft with Retry and makes up no plan', async () => {
    let job = draftJob('failed', 'ai_failed')
    const fetchMock = stubServer({
      [`GET ${THIS_WEEK}`]: () => errorResponse(404, 'not_found'),
      [`POST ${DRAFT}`]: () => jsonResponse(202, { jobId: 'j1' }),
      [`GET ${JOB}`]: () => jsonResponse(200, job),
    })
    await renderPage()

    fireEvent.click(await screen.findByRole('button', { name: 'Draft this week' }))
    const alert = await screen.findByRole('alert', {}, { timeout: 3000 })
    expect(alert).toHaveTextContent("Couldn't draft this week. The AI assistant couldn't draft it.")
    expect(screen.getByRole('heading', { name: 'Nothing planned yet' })).toBeInTheDocument()
    expect(screen.queryByTestId('skeleton-tile')).not.toBeInTheDocument()

    job = draftJob('running')
    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
    await waitFor(() => expect(posts(fetchMock)).toEqual([`${DRAFT} {}`, `${DRAFT} {}`]))
    expect(await screen.findByRole('region', { name: 'Drafting this week' })).toBeInTheDocument()
    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
  })

  it.each([
    ['the week has no plan', null, 'The week has no plan, not draft plan-1.'],
    ['the week has another plan', { ...planBody('draft'), id: 'plan-9' }, "The week's plan is not draft plan-1."],
  ])('shows a succeeded draft with Retry when %s once read', async (_, landed, message) => {
    let plan: unknown = null
    let job = draftJob('running')
    const fetchMock = stubServer({
      [`GET ${THIS_WEEK}`]: () => (plan === null ? errorResponse(404, 'not_found') : jsonResponse(200, plan)),
      [`POST ${DRAFT}`]: () => jsonResponse(202, { jobId: 'j1' }),
      [`GET ${JOB}`]: () => jsonResponse(200, job),
    })
    await renderPage()

    fireEvent.click(await screen.findByRole('button', { name: 'Draft this week' }))
    expect(await screen.findByRole('region', { name: 'Drafting this week' })).toBeInTheDocument()
    plan = landed
    job = draftJob('succeeded')
    const alert = await screen.findByRole('alert', {}, { timeout: 3000 })
    expect(alert).toHaveTextContent(`Couldn't read the draft. ${message}`)
    expect(screen.queryByTestId('skeleton-tile')).not.toBeInTheDocument()

    job = draftJob('running')
    fireEvent.click(within(alert).getByRole('button', { name: 'Retry' }))
    await waitFor(() => expect(posts(fetchMock)).toHaveLength(2))
    expect(await screen.findByRole('region', { name: 'Drafting this week' })).toBeInTheDocument()
    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
  })

  it('moves between weeks with the previous and next week buttons', async () => {
    stubServer({
      [`GET ${THIS_WEEK}`]: () => jsonResponse(200, planBody('draft')),
      [`GET ${NEXT_WEEK}`]: () => errorResponse(404, 'not_found'),
    })
    await renderPage()

    expect(await screen.findByText('Beef tacos')).toBeInTheDocument()
    fireEvent.click(screen.getByRole('button', { name: 'Next week' }))
    expect(await screen.findByRole('heading', { level: 1, name: 'Oct 12 – 18' })).toBeInTheDocument()
    expect(screen.getByText('Week 42')).toBeInTheDocument()
    expect(await screen.findByRole('button', { name: 'Draft this week' })).toBeInTheDocument()

    fireEvent.click(screen.getByRole('button', { name: 'Previous week' }))
    expect(await screen.findByRole('heading', { level: 1, name: 'Oct 5 – 11' })).toBeInTheDocument()
    expect(await screen.findByText('Beef tacos')).toBeInTheDocument()
  })

  it("opens on next week once this week's plan_draft time has come", async () => {
    vi.setSystemTime(new Date('2026-10-09T13:00:00Z')) // Friday 09:00 in New York
    stubServer({ [`GET ${NEXT_WEEK}`]: () => errorResponse(404, 'not_found') })
    await renderPage()

    expect(await screen.findByRole('heading', { level: 1, name: 'Oct 12 – 18' })).toBeInTheDocument()
    expect(await screen.findByRole('button', { name: 'Draft this week' })).toBeInTheDocument()
  })

  it("reports a plan that can't be read, with Retry", async () => {
    stubServer({ [`GET ${THIS_WEEK}`]: () => errorResponse(500, 'internal') })
    await renderPage()

    expect(await screen.findByRole('alert', {}, { timeout: 3000 })).toHaveTextContent("Couldn't load this week's plan. internal message")
  })
})