import { describe, it, expect, vi, beforeEach } from 'vitest'
import { render, screen, waitFor } from '@testing-library/react'
import * as api from '@/services/api'
import { App } from './App'

// Mock API service - AuthProvider calls refreshToken on mount
vi.mock('@/services/api')

// Mock WorkspaceProvider to avoid workspace loading logic
vi.mock('@/context/WorkspaceContext', () => ({
  WorkspaceProvider: ({ children }: { children: React.ReactNode }) => (
    <div data-testid="workspace-provider">{children}</div>
  ),
}))

// Mock all page components to verify routing
vi.mock('@/pages/Auth', () => ({
  Auth: () => <div data-testid="auth-page">Auth Page</div>,
}))

vi.mock('@/pages/Calendar', () => ({
  Calendar: () => <div data-testid="calendar-page">Calendar Page</div>,
}))

vi.mock('@/pages/Dashboard', () => ({
  Dashboard: () => <div data-testid="dashboard-page">Dashboard Page</div>,
}))

vi.mock('@/pages/Settings', () => ({
  Settings: () => <div data-testid="settings-page">Settings Page</div>,
}))

vi.mock('@/pages/DevFetch', () => ({
  DevFetch: () => <div data-testid="dev-fetch-page">DevFetch Page</div>,
}))

// App supplies its own BrowserRouter. Replace it with a pass-through
// so MemoryRouter can control routing in tests.
vi.mock('react-router-dom', async () => {
  const actual = await vi.importActual('react-router-dom')
  return {
    ...actual,
    BrowserRouter: ({ children }: { children: React.ReactNode }) => <>{children}</>,
  }
})

// Import MemoryRouter from the mocked module (gets the real one via spread)
import { MemoryRouter } from 'react-router-dom'

describe('App', () => {
  beforeEach(() => {
    vi.clearAllMocks()
  })

  const renderWithRoute = (route: string = '/') => {
    return render(
      <MemoryRouter initialEntries={[route]}>
        <App />
      </MemoryRouter>
    )
  }

  describe('auth state handling', () => {
    it('shows loading state when auth is initializing', () => {
      // Mock refreshToken to never resolve (simulates loading state)
      vi.mocked(api.refreshToken).mockImplementation(() => new Promise(() => {}))

      renderWithRoute('/')
      expect(screen.getByText('Laddar…')).toBeInTheDocument()
    })

    it('navigates to auth page when not authenticated', async () => {
      // Mock refreshToken to reject (no valid session)
      vi.mocked(api.refreshToken).mockRejectedValue(new Error('Unauthorized'))

      renderWithRoute('/')
      await waitFor(() => {
        expect(screen.getByTestId('auth-page')).toBeInTheDocument()
      })
    })

    it('shows dashboard when authenticated', async () => {
      // Mock refreshToken to return a token (user is authenticated)
      vi.mocked(api.refreshToken).mockResolvedValue({
        access_token: 'test-token',
        token_type: 'bearer',
        expires_in: 3600,
      })
      vi.mocked(api.setAccessToken).mockImplementation(() => {})

      renderWithRoute('/')
      await waitFor(() => {
        expect(screen.getByTestId('dashboard-page')).toBeInTheDocument()
      })
    })
  })

  describe('protected routes', () => {
    it('renders protected route when authenticated', async () => {
      // Test that calendar (another protected route) also works when authenticated
      vi.mocked(api.refreshToken).mockResolvedValue({
        access_token: 'test-token',
        token_type: 'bearer',
        expires_in: 3600,
      })
      vi.mocked(api.setAccessToken).mockImplementation(() => {})

      renderWithRoute('/calendar')
      await waitFor(() => {
        expect(screen.getByTestId('calendar-page')).toBeInTheDocument()
      })
    })

    it('redirects to auth page when accessing protected route without authentication', async () => {
      // Even on a protected route like /calendar, unauthenticated users are sent to auth
      vi.mocked(api.refreshToken).mockRejectedValue(new Error('Unauthorized'))

      renderWithRoute('/calendar')
      await waitFor(() => {
        expect(screen.getByTestId('auth-page')).toBeInTheDocument()
      })
    })
  })

  describe('retired /plan and /tips routes', () => {
    // The Plan and Tips tabs were removed (leave is now authored on the
    // calendar, and Översikt carries the headline figures) — neither route
    // is registered any more, so both now fall through to the catch-all
    // and redirect to "/" instead of rendering a page or 404ing.
    it('redirects /plan to the dashboard when authenticated', async () => {
      vi.mocked(api.refreshToken).mockResolvedValue({
        access_token: 'test-token',
        token_type: 'bearer',
        expires_in: 3600,
      })
      vi.mocked(api.setAccessToken).mockImplementation(() => {})

      renderWithRoute('/plan')
      await waitFor(() => {
        expect(screen.getByTestId('dashboard-page')).toBeInTheDocument()
      })
    })

    it('redirects /tips to the dashboard when authenticated', async () => {
      vi.mocked(api.refreshToken).mockResolvedValue({
        access_token: 'test-token',
        token_type: 'bearer',
        expires_in: 3600,
      })
      vi.mocked(api.setAccessToken).mockImplementation(() => {})

      renderWithRoute('/tips')
      await waitFor(() => {
        expect(screen.getByTestId('dashboard-page')).toBeInTheDocument()
      })
    })
  })

  describe('app structure', () => {
    it('wraps app with AuthProvider and WorkspaceProvider', async () => {
      // Verify the provider wrappers are in place by checking that auth flow works
      // (both depend on these providers existing)
      vi.mocked(api.refreshToken).mockRejectedValue(new Error('Unauthorized'))

      renderWithRoute('/')
      await waitFor(() => {
        expect(screen.getByTestId('workspace-provider')).toBeInTheDocument()
      })
    })
  })
})