import { describe, it, expect, vi, beforeEach } from 'vitest'
import { render, screen, fireEvent, waitFor } from '@testing-library/react'
import { Auth } from './Auth'
import { useAuth } from '@/context/AuthContext'
import { useWorkspace } from '@/context/WorkspaceContext'

vi.mock('@/context/AuthContext')
vi.mock('@/context/WorkspaceContext')

const mockNavigate = vi.fn()
vi.mock('react-router-dom', async () => {
  const actual = await vi.importActual<typeof import('react-router-dom')>('react-router-dom')
  return {
    ...actual,
    useNavigate: () => mockNavigate,
  }
})

const mockUseAuth = vi.mocked(useAuth)
const mockUseWorkspace = vi.mocked(useWorkspace)

describe('Auth', () => {
  const mockLogin = vi.fn()
  const mockRegister = vi.fn()

  beforeEach(() => {
    vi.clearAllMocks()
    mockUseAuth.mockReturnValue({
      accessToken: null,
      isAuthenticated: false,
      isLoading: false,
      login: mockLogin,
      register: mockRegister,
      logout: vi.fn(),
    })
    mockUseWorkspace.mockReturnValue({
      workspace: null,
      isLoading: false,
      error: null,
      workspaceId: null,
      setWorkspaceId: vi.fn(),
      refetch: vi.fn(),
      children: [],
      selectedChildId: null,
      selectChild: vi.fn(),
      personalDataUuid: null,
      parentName: null,
      refreshContext: vi.fn(),
      planVersion: 0,
      bumpPlanVersion: vi.fn(),
    })
  })

  it('renders the login form by default, with the login tab active', () => {
    render(<Auth />)
    expect(screen.getByRole('heading', { name: 'Logga in' })).toBeInTheDocument()
    expect(screen.getByPlaceholderText('E-post')).toBeInTheDocument()
    expect(screen.getByPlaceholderText('Lösenord')).toBeInTheDocument()
    expect(screen.queryByPlaceholderText('Namn')).not.toBeInTheDocument()
    // Both tabs' text is unique except "Logga in", which the login-mode
    // submit button also renders — the tabs carry their own testids so
    // these queries don't collide with it.
    expect(screen.getByTestId('auth-tab-login')).toHaveAttribute('aria-pressed', 'true')
    expect(screen.getByTestId('auth-tab-register')).toHaveAttribute('aria-pressed', 'false')
  })

  it('switches to the registration form via the tab', () => {
    render(<Auth />)
    fireEvent.click(screen.getByTestId('auth-tab-register'))
    expect(screen.getByRole('heading', { name: 'Skapa konto' })).toBeInTheDocument()
    expect(screen.getByPlaceholderText('Namn')).toBeInTheDocument()
    expect(screen.getByTestId('auth-tab-register')).toHaveAttribute('aria-pressed', 'true')
    expect(screen.getByTestId('auth-tab-login')).toHaveAttribute('aria-pressed', 'false')
  })

  it('switches back to the login form via the tab', () => {
    render(<Auth />)
    fireEvent.click(screen.getByTestId('auth-tab-register'))
    fireEvent.click(screen.getByTestId('auth-tab-login'))
    expect(screen.getByRole('heading', { name: 'Logga in' })).toBeInTheDocument()
    expect(screen.queryByPlaceholderText('Namn')).not.toBeInTheDocument()
  })

  it('clears the error banner when switching between the Log in and Create account tabs', async () => {
    mockLogin.mockRejectedValue(new Error('Fel användarnamn'))
    render(<Auth />)

    fireEvent.click(screen.getByTestId('auth-submit'))
    expect(await screen.findByRole('alert')).toHaveTextContent('Fel användarnamn')

    fireEvent.click(screen.getByTestId('auth-tab-register'))
    expect(screen.queryByRole('alert')).not.toBeInTheDocument()
  })

  it('logs in with the entered credentials and navigates home', async () => {
    mockLogin.mockResolvedValue(undefined)
    render(<Auth />)

    fireEvent.change(screen.getByPlaceholderText('E-post'), { target: { value: 'a@b.com' } })
    fireEvent.change(screen.getByPlaceholderText('Lösenord'), { target: { value: 'secret' } })
    fireEvent.click(screen.getByTestId('auth-submit'))

    await waitFor(() => expect(mockLogin).toHaveBeenCalledWith({ email: 'a@b.com', password: 'secret' }))
    expect(mockNavigate).toHaveBeenCalledWith('/', { replace: true })
  })

  it('registers with the entered details and navigates home', async () => {
    mockRegister.mockResolvedValue(undefined)
    render(<Auth />)

    fireEvent.click(screen.getByTestId('auth-tab-register'))
    fireEvent.change(screen.getByPlaceholderText('Namn'), { target: { value: 'Alex' } })
    fireEvent.change(screen.getByPlaceholderText('E-post'), { target: { value: 'a@b.com' } })
    fireEvent.change(screen.getByPlaceholderText('Lösenord'), { target: { value: 'secret' } })
    fireEvent.click(screen.getByTestId('auth-submit'))

    await waitFor(() =>
      expect(mockRegister).toHaveBeenCalledWith({ email: 'a@b.com', password: 'secret', displayName: 'Alex' }),
    )
    expect(mockNavigate).toHaveBeenCalledWith('/', { replace: true })
  })

  it('shows the error message from a failed login', async () => {
    mockLogin.mockRejectedValue(new Error('Fel användarnamn'))
    render(<Auth />)

    fireEvent.click(screen.getByTestId('auth-submit'))

    expect(await screen.findByRole('alert')).toHaveTextContent('Fel användarnamn')
  })

  it('shows a generic error message when login rejects with a non-Error value', async () => {
    mockLogin.mockRejectedValue('nope')
    render(<Auth />)

    fireEvent.click(screen.getByTestId('auth-submit'))

    expect(await screen.findByRole('alert')).toHaveTextContent('Något gick fel')
  })

  it('redirects to the dashboard once authenticated and the workspace has loaded', () => {
    mockUseAuth.mockReturnValue({
      accessToken: 'token',
      isAuthenticated: true,
      isLoading: false,
      login: mockLogin,
      register: mockRegister,
      logout: vi.fn(),
    })
    render(<Auth />)
    expect(mockNavigate).toHaveBeenCalledWith('/', { replace: true })
  })

  it('does not redirect while the workspace is still loading', () => {
    mockUseAuth.mockReturnValue({
      accessToken: 'token',
      isAuthenticated: true,
      isLoading: false,
      login: mockLogin,
      register: mockRegister,
      logout: vi.fn(),
    })
    mockUseWorkspace.mockReturnValue({
      workspace: null,
      isLoading: true,
      error: null,
      workspaceId: null,
      setWorkspaceId: vi.fn(),
      refetch: vi.fn(),
      children: [],
      selectedChildId: null,
      selectChild: vi.fn(),
      personalDataUuid: null,
      parentName: null,
      refreshContext: vi.fn(),
      planVersion: 0,
      bumpPlanVersion: vi.fn(),
    })
    render(<Auth />)
    expect(mockNavigate).not.toHaveBeenCalled()
  })
})