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

vi.mock('@/services/api')
vi.mock('@/services/errors')
vi.mock('@/hooks', () => ({
  useScraperFetch: vi.fn(),
}))

describe('DevFetch', () => {
  const mockUserContext: api.UserContext = {
    workspace_id: 'ws-test-123',
    personal_data_uuid: 'pd-test-456',
    parent_name: 'Test Parent',
    children: [
      {
        id: 'child-1',
        name: 'Test Child',
        birth_date: '2022-01-15',
      },
    ],
  }

  const emptyUserContext: api.UserContext = {
    workspace_id: 'ws-test-123',
    personal_data_uuid: 'pd-test-456',
    parent_name: 'Test Parent',
    children: [],
  }

  const mockScraperFetchResult = {
    sessionId: null,
    pollData: null,
    resolvedIds: null,
    error: null,
    isUnauthorized: false,
    start: vi.fn(),
    cancel: vi.fn(),
    isRunning: false,
    isTerminal: false,
  }

  beforeEach(() => {
    vi.clearAllMocks()
    vi.mocked(api.getUserContext).mockResolvedValue(mockUserContext)
    vi.mocked(errors.isUnauthorized).mockReturnValue(false)
    vi.mocked(useScraperFetch).mockReturnValue(mockScraperFetchResult)
  })

  describe('initial load', () => {
    it('loads user context on mount', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(api.getUserContext).toHaveBeenCalled()
      })
    })

    it('displays workspace and personal data when context loads', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/ws-test-123/)).toBeInTheDocument()
        expect(screen.getByText(/pd-test-456/)).toBeInTheDocument()
      })
    })

    it('displays children when context includes them', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Test Child \(2022-01-15\)/)).toBeInTheDocument()
      })
    })

    it('displays no children message when context has no children', async () => {
      vi.mocked(api.getUserContext).mockResolvedValue(emptyUserContext)

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Inga barn registrerade/)).toBeInTheDocument()
      })
    })
  })

  describe('error handling', () => {
    it('displays unauthorized error when getUserContext fails with 401', async () => {
      const unauthorizedError = new Error('Unauthorized')
      vi.mocked(api.getUserContext).mockRejectedValue(unauthorizedError)
      vi.mocked(errors.isUnauthorized).mockReturnValue(true)

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Setup-fel:/)).toBeInTheDocument()
        expect(screen.getByText(/Not authenticated/)).toBeInTheDocument()
      })
    })

    it('displays login link when unauthorized error occurs', async () => {
      const unauthorizedError = new Error('Unauthorized')
      vi.mocked(api.getUserContext).mockRejectedValue(unauthorizedError)
      vi.mocked(errors.isUnauthorized).mockReturnValue(true)
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        isUnauthorized: true,
      })

      render(<DevFetch />)

      await waitFor(() => {
        const loginLink = screen.getByText(/Logga in först/)
        expect(loginLink).toBeInTheDocument()
        expect(loginLink).toHaveAttribute('href', '/auth')
      })
    })

    it('displays generic error when getUserContext fails with other errors', async () => {
      const genericError = new Error('Network error')
      vi.mocked(api.getUserContext).mockRejectedValue(genericError)
      vi.mocked(errors.isUnauthorized).mockReturnValue(false)

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Setup-fel:/)).toBeInTheDocument()
        expect(screen.getByText(/Network error/)).toBeInTheDocument()
      })
    })

    it('handles non-Error exception in getUserContext', async () => {
      vi.mocked(api.getUserContext).mockRejectedValue('Unknown error')
      vi.mocked(errors.isUnauthorized).mockReturnValue(false)

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Setup-fel:/)).toBeInTheDocument()
        expect(screen.getByText(/Failed to load context/)).toBeInTheDocument()
      })
    })
  })

  describe('refresh button', () => {
    it('disables refresh button when no children', async () => {
      vi.mocked(api.getUserContext).mockResolvedValue(emptyUserContext)

      render(<DevFetch />)

      await waitFor(() => {
        const refreshButton = screen.getByRole('button', { name: /Refresh/ })
        expect(refreshButton).toBeDisabled()
      })
    })

    it('enables refresh button when children exist', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        const refreshButton = screen.getByRole('button', { name: /Refresh/ })
        expect(refreshButton).not.toBeDisabled()
      })
    })

    it('calls scraper.start when refresh is clicked', async () => {
      const mockStart = vi.fn()
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        start: mockStart,
      })

      render(<DevFetch />)

      const refreshButton = await screen.findByRole('button', { name: /Refresh/ })
      fireEvent.click(refreshButton)

      expect(mockStart).toHaveBeenCalled()
    })
  })

  describe('create child', () => {
    beforeEach(() => {
      vi.mocked(api.getUserContext).mockResolvedValue(emptyUserContext)
    })

    it('shows child creation form when no children exist', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByPlaceholderText(/Barnets namn/)).toBeInTheDocument()
        expect(screen.getByPlaceholderText(/Födelsedatum/)).toBeInTheDocument()
      })
    })

    it('hides child creation form when children exist', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.queryByPlaceholderText(/Barnets namn/)).not.toBeInTheDocument()
      })
    })

    it('disables create button when name or date is empty', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        const createButton = screen.getByRole('button', { name: /Skapa barn/ })
        expect(createButton).toBeDisabled()
      })
    })

    it('enables create button when both name and date are filled', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
        const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
        fireEvent.change(nameInput, { target: { value: 'New Child' } })
        fireEvent.change(dateInput, { target: { value: '2024-01-01' } })
      })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      expect(createButton).not.toBeDisabled()
    })

    it('calls api.createChild with correct parameters', async () => {
      const mockCreateChild = vi.fn().mockResolvedValue({ id: 'new-child', name: 'New Child' })
      vi.mocked(api.createChild).mockImplementation(mockCreateChild)

      render(<DevFetch />)

      await waitFor(() => {
        const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
        const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
        fireEvent.change(nameInput, { target: { value: 'New Child' } })
        fireEvent.change(dateInput, { target: { value: '2024-01-01' } })
      })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      fireEvent.click(createButton)

      await waitFor(() => {
        expect(mockCreateChild).toHaveBeenCalledWith({
          workspace_id: 'ws-test-123',
          name: 'New Child',
          birth_date: '2024-01-01',
        })
      })
    })

    it('shows loading state while creating child', async () => {
      vi.mocked(api.createChild).mockImplementation(
        () => new Promise(resolve => setTimeout(() => resolve({ id: 'new-child', name: 'New Child' }), 100))
      )

      render(<DevFetch />)

      await waitFor(() => {
        const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
        const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
        fireEvent.change(nameInput, { target: { value: 'New Child' } })
        fireEvent.change(dateInput, { target: { value: '2024-01-01' } })
      })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      fireEvent.click(createButton)

      await waitFor(() => {
        expect(screen.getByRole('button', { name: /Skapar…/ })).toBeInTheDocument()
      })
    })

    it('reloads context after successful child creation', async () => {
      vi.mocked(api.createChild).mockResolvedValue({ id: 'new-child', name: 'New Child' })

      render(<DevFetch />)

      await waitFor(() => {
        const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
        const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
        fireEvent.change(nameInput, { target: { value: 'New Child' } })
        fireEvent.change(dateInput, { target: { value: '2024-01-01' } })
      })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      fireEvent.click(createButton)

      await waitFor(() => {
        expect(api.getUserContext).toHaveBeenCalledTimes(2)
      })
    })

    it('clears form inputs and hides form after successful child creation', async () => {
      vi.mocked(api.getUserContext)
        .mockResolvedValueOnce(emptyUserContext)
        .mockResolvedValueOnce(mockUserContext) // Return non-empty after create

      vi.mocked(api.createChild).mockResolvedValue({ id: 'new-child', name: 'New Child' })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByPlaceholderText(/Barnets namn/)).toBeInTheDocument()
      })

      const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
      const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
      fireEvent.change(nameInput, { target: { value: 'New Child' } })
      fireEvent.change(dateInput, { target: { value: '2024-01-01' } })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      fireEvent.click(createButton)

      // After creation succeeds, the form should be hidden because context now includes children
      await waitFor(() => {
        expect(screen.queryByPlaceholderText(/Barnets namn/)).not.toBeInTheDocument()
      })
    })

    it('handles error when child creation fails', async () => {
      vi.mocked(api.createChild).mockRejectedValue(new Error('Creation failed'))

      render(<DevFetch />)

      await waitFor(() => {
        const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
        const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
        fireEvent.change(nameInput, { target: { value: 'New Child' } })
        fireEvent.change(dateInput, { target: { value: '2024-01-01' } })
      })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      fireEvent.click(createButton)

      await waitFor(() => {
        expect(screen.getByText(/Setup-fel:/)).toBeInTheDocument()
        expect(screen.getByText(/Creation failed/)).toBeInTheDocument()
      })
    })

    it('handles non-Error exception in child creation', async () => {
      vi.mocked(api.createChild).mockRejectedValue('Unknown error')

      render(<DevFetch />)

      await waitFor(() => {
        const nameInput = screen.getByPlaceholderText(/Barnets namn/) as HTMLInputElement
        const dateInput = screen.getByPlaceholderText(/Födelsedatum/) as HTMLInputElement
        fireEvent.change(nameInput, { target: { value: 'New Child' } })
        fireEvent.change(dateInput, { target: { value: '2024-01-01' } })
      })

      const createButton = screen.getByRole('button', { name: /Skapa barn/ })
      fireEvent.click(createButton)

      await waitFor(() => {
        expect(screen.getByText(/Setup-fel:/)).toBeInTheDocument()
        expect(screen.getByText(/Failed to create child/)).toBeInTheDocument()
      })
    })
  })

  describe('scraper integration', () => {
    it('displays resolved IDs when scraper has them', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        resolvedIds: {
          workspace_id: 'ws-resolved',
          personal_data_uuid: 'pd-resolved',
          child_id: 'c-resolved',
        },
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/workspace_id: ws-resolved/)).toBeInTheDocument()
        expect(screen.getByText(/personal_data_uuid: pd-resolved/)).toBeInTheDocument()
        expect(screen.getByText(/child_id: c-resolved/)).toBeInTheDocument()
      })
    })

    it('displays scraper error when present', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        error: 'Scraper session failed',
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Fel:/)).toBeInTheDocument()
        expect(screen.getByText(/Scraper session failed/)).toBeInTheDocument()
      })
    })

    it('displays polling status when scraper is active', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'authenticating',
          message: 'Scanning BankID...',
        },
        isRunning: true,
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Status:/)).toBeInTheDocument()
        expect(screen.getByText(/authenticating/)).toBeInTheDocument()
      })
    })

    it('displays QR code when awaiting scan', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'awaiting_scan',
          qr_data: 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==',
        },
        isRunning: true,
      })

      render(<DevFetch />)

      await waitFor(() => {
        const qrImage = screen.getByAltText(/BankID QR-kod/) as HTMLImageElement
        expect(qrImage).toBeInTheDocument()
        expect(qrImage.src).toContain('data:image/png;base64,')
      })
    })

    it('colors the status red when the scraper session errored', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'error',
          message: 'Something broke',
        },
      })

      render(<DevFetch />)

      await waitFor(() => {
        const statusValue = screen.getByText('error')
        expect(statusValue).toHaveStyle({ color: 'rgb(255, 0, 0)' })
      })
    })

    it('displays fetching message during data fetch', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'fetching',
        },
        isRunning: true,
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Hämtar data från FK…/)).toBeInTheDocument()
      })
    })

    it('displays success state with result data', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'done',
          result: {
            children: [
              {
                name: 'Scraped Child',
                birth_date: '2023-06-15',
              },
            ],
          },
        },
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Klar! Hämtad data:/)).toBeInTheDocument()
        expect(screen.getByText(/Scraped Child/)).toBeInTheDocument()
      })
    })

    it('displays cancel button when scraper is running', async () => {
      const mockCancel = vi.fn()
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'authenticating',
        },
        isRunning: true,
        cancel: mockCancel,
      })

      render(<DevFetch />)

      await waitFor(() => {
        const cancelButton = screen.getByRole('button', { name: /Avbryt/ })
        expect(cancelButton).toBeInTheDocument()
        fireEvent.click(cancelButton)
        expect(mockCancel).toHaveBeenCalled()
      })
    })

    it('displays cancelled message when scraper session is cancelled', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'cancelled',
        },
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Sessionen avbröts./)).toBeInTheDocument()
      })
    })

    it('does not display cancel button when scraper is not running', async () => {
      vi.mocked(useScraperFetch).mockReturnValue({
        ...mockScraperFetchResult,
        pollData: {
          status: 'done',
        },
        isRunning: false,
      })

      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.queryByRole('button', { name: /Avbryt/ })).not.toBeInTheDocument()
      })
    })
  })

  describe('page structure and styling', () => {
    it('renders the header with tool name', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/🔧 FK Scraper Test Harness/)).toBeInTheDocument()
      })
    })

    it('renders the description text', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Dev-only./)).toBeInTheDocument()
      })
    })

    it('renders context information box when context is loaded', async () => {
      render(<DevFetch />)

      await waitFor(() => {
        expect(screen.getByText(/Workspace:/)).toBeInTheDocument()
        expect(screen.getByText(/PersonalData:/)).toBeInTheDocument()
        expect(screen.getByText(/Barn:/)).toBeInTheDocument()
      })
    })
  })
})