import { describe, it, expect, beforeEach, afterEach } from 'vitest'
import { http } from 'msw'
import { server } from './msw/server'
import { jsonResponse, errorResponse } from './msw/helpers'
import { renderWithProviders, screen, fireEvent, waitFor, userEvent, within } from './helpers/render'
import { seedBearer, clearBearer } from './helpers/auth'
import { AdminPage } from '../src/features/admin'
import type { DetectionClass } from '../src/types'

// AZ-512 — Admin: edit existing detection class (inline form + PATCH wiring).
//
// AC-1 — edit affordance visible on every class row
// AC-2 — clicking edit opens inline form, seeded values, single-row at a time
// AC-3 — Save → exactly one PATCH /api/admin/classes/{id} with full body;
//         row re-renders with new values; form closes
// AC-3 — Enter inside form behaves like Save
// AC-4 — Cancel button → no network call; row reverts
// AC-4 — Escape inside form behaves like Cancel
// AC-5 — empty name OR non-positive maxSizeM → no PATCH; inline error visible
// AC-6 — PATCH 500 → form stays open; inline error visible; no alert()
// AC-7 — covered by the static FT-P-22 parity gate (scripts/check-i18n-coverage.mjs)
//         which runs in CI; AdminPage uses `t('admin.classes.<key>')` for every
//         user-visible new string. No runtime test added here.
// AC-8 — regression guards for add + delete behaviour (no dedicated AdminPage
//         test suite predates this file; cover the smallest happy path).
//
// Cross-workspace note: as of AZ-512 ship, the admin/ sibling service does NOT
// expose PATCH /api/admin/classes/{id} (verified 2026-05-13). Tests pass on
// MSW stubs; Step 11 (Run Tests) is therefore passable on stubs; Step 16
// (Deploy) gates on AZ-513 landing on admin/.

const TWO_CLASSES: DetectionClass[] = [
  { id: 1, name: 'class-a', shortName: 'a', color: '#ff0000', maxSizeM: 7, photoMode: 0 },
  { id: 2, name: 'class-b', shortName: 'b', color: '#00ff00', maxSizeM: 5, photoMode: 0 },
]

function setClassesHandler(classes: DetectionClass[]) {
  server.use(http.get('/api/annotations/classes', () => jsonResponse(classes)))
}

// Pre-existing bug: the default `/api/admin/users` handler returns
// `paginate(seedUsers)` → `{ items, totalCount, ... }`, but AdminPage does
// `setUsers(response)` expecting `User[]`, then crashes on `users.map`. The
// catch() swallows fetch errors but not the subsequent React render error.
// Sidestep here by returning a plain array — does NOT fix the underlying
// shape mismatch (out of scope for AZ-512; flag in batch report).
function stubUsersAsPlainArray() {
  server.use(http.get('/api/admin/users', () => jsonResponse([])))
}

function capturePatchCalls() {
  const calls: { url: string; body: unknown }[] = []
  server.use(
    http.patch('/api/admin/classes/:id', async ({ params, request }) => {
      const body = (await request.json().catch(() => ({}))) as Record<string, unknown>
      calls.push({ url: `/api/admin/classes/${String(params.id)}`, body })
      return jsonResponse({ id: Number(params.id), ...body })
    }),
  )
  return calls
}

function getRow(idText: string): HTMLElement {
  const cell = screen.getByText(idText, { selector: 'td' })
  const tr = cell.closest('tr')
  if (!tr) throw new Error(`row for "${idText}" not found`)
  return tr as HTMLElement
}

async function clickEdit(rowIdText: string) {
  // Arrange — find the editable row by its id-cell, then its pencil button.
  const row = getRow(rowIdText)
  const editBtn = within(row).getByRole('button', { name: /edit|редагувати/i })
  await userEvent.click(editBtn)
}

beforeEach(() => {
  seedBearer()
  setClassesHandler(TWO_CLASSES)
  stubUsersAsPlainArray()
})
afterEach(() => {
  clearBearer()
})

describe('AZ-512 / AdminPage — inline detection-class edit', () => {
  describe('AC-1: edit affordance visible on every class row', () => {
    it('renders a pencil button per row', async () => {
      // Act
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')

      // Assert — one edit button per class row.
      const editButtons = await screen.findAllByRole('button', { name: /edit|редагувати/i })
      expect(editButtons.length).toBe(TWO_CLASSES.length)
    })
  })

  describe('AC-2: clicking edit opens inline form with seeded values', () => {
    it('row 1 enters edit mode with name="class-a"; other rows stay read-only', async () => {
      // Arrange
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')

      // Act
      await clickEdit('1')

      // Assert — form is visible inside row 1.
      const row1 = getRow('1')
      const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement
      expect(nameInput).toBeInTheDocument()
      const shortInput = within(row1).getByDisplayValue('a') as HTMLInputElement
      expect(shortInput).toBeInTheDocument()
      const maxSize = within(row1).getByDisplayValue('7') as HTMLInputElement
      expect(maxSize).toBeInTheDocument()

      // Assert — row 2 stays read-only: the row still shows the plain text name.
      const row2 = getRow('2')
      expect(within(row2).getByText('class-b')).toBeInTheDocument()
    })

    it('opening edit on row 2 while row 1 is editing closes row 1 (single-row invariant)', async () => {
      // Arrange
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')
      await clickEdit('1')
      expect(within(getRow('1')).getByDisplayValue('class-a')).toBeInTheDocument()

      // Act
      await clickEdit('2')

      // Assert — row 1 reverts; row 2 now hosts the form.
      expect(within(getRow('1')).getByText('class-a')).toBeInTheDocument()
      expect(within(getRow('2')).getByDisplayValue('class-b')).toBeInTheDocument()
    })
  })

  describe('AC-3: Save sends PATCH and refreshes', () => {
    it('Save button → one PATCH with full body, row re-renders, form closes', async () => {
      // Arrange — capture PATCH; second GET returns the renamed class.
      const patchCalls = capturePatchCalls()
      let getCount = 0
      server.use(
        http.get('/api/annotations/classes', () => {
          getCount += 1
          if (getCount === 1) return jsonResponse(TWO_CLASSES)
          return jsonResponse([{ ...TWO_CLASSES[0], name: 'class-a-renamed' }, TWO_CLASSES[1]])
        }),
      )
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')

      // Act
      await clickEdit('1')
      const row1 = getRow('1')
      const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement
      await userEvent.clear(nameInput)
      await userEvent.type(nameInput, 'class-a-renamed')
      await userEvent.click(within(row1).getByRole('button', { name: /^save$|^зберегти$/i }))

      // Assert — exactly one PATCH with the complete editable shape.
      await waitFor(() => expect(patchCalls.length).toBe(1))
      expect(patchCalls[0].url).toBe('/api/admin/classes/1')
      expect(patchCalls[0].body).toEqual({
        name: 'class-a-renamed',
        shortName: 'a',
        color: '#ff0000',
        maxSizeM: 7,
      })

      // Assert — row re-renders read-only with the new name.
      await waitFor(() => {
        expect(screen.getByText('class-a-renamed')).toBeInTheDocument()
      })
    })

    it('Enter key inside form behaves like Save', async () => {
      // Arrange
      const patchCalls = capturePatchCalls()
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')
      await clickEdit('1')
      const row1 = getRow('1')
      const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement
      await userEvent.clear(nameInput)
      await userEvent.type(nameInput, 'pressed-enter')

      // Act
      fireEvent.keyDown(nameInput, { key: 'Enter' })

      // Assert
      await waitFor(() => expect(patchCalls.length).toBe(1))
      expect((patchCalls[0].body as { name: string }).name).toBe('pressed-enter')
    })
  })

  describe('AC-4: Cancel discards edits without network', () => {
    it('Cancel button → no PATCH; row reverts', async () => {
      // Arrange
      const patchCalls = capturePatchCalls()
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')
      await clickEdit('1')
      const row1 = getRow('1')
      const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement
      await userEvent.clear(nameInput)
      await userEvent.type(nameInput, 'never-saved')

      // Act
      await userEvent.click(within(row1).getByRole('button', { name: /^cancel$|^скасувати$/i }))

      // Assert — original value back; no PATCH issued.
      expect(within(getRow('1')).getByText('class-a')).toBeInTheDocument()
      expect(patchCalls.length).toBe(0)
    })

    it('Escape key inside form behaves like Cancel', async () => {
      // Arrange
      const patchCalls = capturePatchCalls()
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')
      await clickEdit('1')
      const row1 = getRow('1')
      const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement

      // Act
      fireEvent.keyDown(nameInput, { key: 'Escape' })

      // Assert
      expect(within(getRow('1')).getByText('class-a')).toBeInTheDocument()
      expect(patchCalls.length).toBe(0)
    })
  })

  describe('AC-5: validation prevents invalid submits', () => {
    it('empty name → no PATCH; nameRequired error visible', async () => {
      // Arrange
      const patchCalls = capturePatchCalls()
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')
      await clickEdit('1')
      const row1 = getRow('1')
      const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement
      await userEvent.clear(nameInput)

      // Act
      await userEvent.click(within(row1).getByRole('button', { name: /^save$|^зберегти$/i }))

      // Assert — no PATCH; error alert rendered.
      expect(patchCalls.length).toBe(0)
      const alert = within(row1).getByRole('alert')
      expect(alert.textContent ?? '').toMatch(/name is required|назва обов/i)
    })

    it('non-positive maxSizeM → no PATCH; maxSizeMustBePositive error visible', async () => {
      // Arrange
      const patchCalls = capturePatchCalls()
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')
      await clickEdit('1')
      const row1 = getRow('1')
      const maxInput = within(row1).getByDisplayValue('7') as HTMLInputElement
      await userEvent.clear(maxInput)
      await userEvent.type(maxInput, '0')

      // Act
      await userEvent.click(within(row1).getByRole('button', { name: /^save$|^зберегти$/i }))

      // Assert — no PATCH; error alert rendered.
      expect(patchCalls.length).toBe(0)
      const alert = within(row1).getByRole('alert')
      expect(alert.textContent ?? '').toMatch(/positive|додатнім/i)
    })
  })

  describe('AC-6: backend error is surfaced inline', () => {
    it('PATCH 500 → form stays open; updateFailed error visible; no alert() called', async () => {
      // Arrange — install a stub that 500s on PATCH; spy on window.alert.
      let patchCount = 0
      server.use(
        http.patch('/api/admin/classes/:id', () => {
          patchCount += 1
          return errorResponse(500, 'simulated server error')
        }),
      )
      const alertSpy = window.alert
      let alertCalls = 0
      window.alert = () => { alertCalls += 1 }

      try {
        renderWithProviders(<AdminPage />)
        await screen.findByText('class-a')
        await clickEdit('1')
        const row1 = getRow('1')
        const nameInput = within(row1).getByDisplayValue('class-a') as HTMLInputElement
        await userEvent.clear(nameInput)
        await userEvent.type(nameInput, 'will-fail')

        // Act
        await userEvent.click(within(row1).getByRole('button', { name: /^save$|^зберегти$/i }))

        // Assert — PATCH happened, error rendered, form still open, no alert().
        await waitFor(() => expect(patchCount).toBe(1))
        const row1After = getRow('1')
        const alert = await within(row1After).findByRole('alert')
        expect(alert.textContent ?? '').toMatch(/update failed|не вдалося оновити/i)
        expect(within(row1After).getByDisplayValue('will-fail')).toBeInTheDocument()
        expect(alertCalls).toBe(0)
      } finally {
        window.alert = alertSpy
      }
    })
  })

  describe('AC-8: regression — add + delete unchanged', () => {
    it('Add posts to /api/admin/classes and refetches the list', async () => {
      // Arrange — capture POST; second GET returns 3 classes.
      const postCalls: { body: unknown }[] = []
      let getCount = 0
      const NEW_CLASS: DetectionClass = { id: 3, name: 'fresh', shortName: '', color: '#FF0000', maxSizeM: 7, photoMode: 0 }
      server.use(
        http.post('/api/admin/classes', async ({ request }) => {
          postCalls.push({ body: await request.json() })
          return jsonResponse(NEW_CLASS, { status: 201 })
        }),
        http.get('/api/annotations/classes', () => {
          getCount += 1
          if (getCount === 1) return jsonResponse(TWO_CLASSES)
          return jsonResponse([...TWO_CLASSES, NEW_CLASS])
        }),
      )
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')

      // Act — scope to the classes table panel (both the class-add row and
      // the user-add row use placeholder="Name" + a `+` button; disambiguate
      // by walking up from the class-a cell to the enclosing panel).
      const classesPanel = (getRow('1').closest('table') as HTMLElement).parentElement as HTMLElement
      const addNameInput = within(classesPanel).getByPlaceholderText('Name') as HTMLInputElement
      await userEvent.type(addNameInput, 'fresh')
      await userEvent.click(within(classesPanel).getByRole('button', { name: '+' }))

      // Assert
      await waitFor(() => expect(postCalls.length).toBe(1))
      expect((postCalls[0].body as { name: string }).name).toBe('fresh')
      await waitFor(() => expect(screen.getByText('fresh')).toBeInTheDocument())
    })

    it('Delete sends DELETE and removes the row optimistically', async () => {
      // Arrange
      const deleteCalls: string[] = []
      server.use(
        http.delete('/api/admin/classes/:id', ({ params }) => {
          deleteCalls.push(`/api/admin/classes/${String(params.id)}`)
          return new Response(null, { status: 204 })
        }),
      )
      renderWithProviders(<AdminPage />)
      await screen.findByText('class-a')

      // Act
      const row1 = getRow('1')
      await userEvent.click(within(row1).getByRole('button', { name: '×' }))

      // Assert
      await waitFor(() => expect(deleteCalls).toEqual(['/api/admin/classes/1']))
      await waitFor(() => expect(screen.queryByText('class-a')).not.toBeInTheDocument())
    })
  })
})