import { describe, it, expect, beforeEach, vi } from 'vitest'
import { render, screen, fireEvent, waitFor } from '@testing-library/react'
import { DayOverridesInput } from './DayOverridesInput'

describe('DayOverridesInput', () => {
  const mockOverrides = [
    {
      id: 'do-1',
      workspaceId: 'ws-1',
      date: '2026-12-24',
      isWorkingDay: true,
      note: 'Jobbade på juldagen',
      createdAt: '2026-01-01T00:00:00',
      updatedAt: '2026-01-01T00:00:00',
    },
    {
      id: 'do-2',
      workspaceId: 'ws-1',
      date: '2026-06-20',
      isWorkingDay: false,
      note: null,
      createdAt: '2026-01-01T00:00:00',
      updatedAt: '2026-01-01T00:00:00',
    },
  ]

  let mockOnAdd: ReturnType<typeof vi.fn>
  let mockOnRemove: ReturnType<typeof vi.fn>

  beforeEach(() => {
    mockOnAdd = vi.fn().mockResolvedValue(undefined)
    mockOnRemove = vi.fn().mockResolvedValue(undefined)
  })

  describe('rendering', () => {
    it('renders list of existing overrides', () => {
      render(
        <DayOverridesInput
          overrides={mockOverrides}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect(screen.getByText('24 december 2026')).toBeInTheDocument()
      expect(screen.getByText('20 juni 2026')).toBeInTheDocument()
    })

    it('renders working day override with correct status', () => {
      render(
        <DayOverridesInput
          overrides={mockOverrides}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect(screen.getByTestId('override-item-do-1').textContent).toContain('Jag jobbar den här dagen')
    })

    it('renders off day override with correct status', () => {
      render(
        <DayOverridesInput
          overrides={mockOverrides}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect(screen.getByTestId('override-item-do-2').textContent).toContain('Jag är ledig den här dagen')
    })

    it('renders note when present', () => {
      render(
        <DayOverridesInput
          overrides={mockOverrides}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect(screen.getByText('Anteckning: Jobbade på juldagen')).toBeInTheDocument()
    })

    it('renders empty state when no overrides', () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect(screen.getByText('Du har inga undantag i kalendern ännu.')).toBeInTheDocument()
    })

    it('renders add form with all fields', () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect(screen.getByTestId('override-date-input')).toBeInTheDocument()
      expect(screen.getByTestId('override-working-radio')).toBeInTheDocument()
      expect(screen.getByTestId('override-off-radio')).toBeInTheDocument()
      expect(screen.getByTestId('override-note-input')).toBeInTheDocument()
      expect(screen.getByTestId('add-override-button')).toBeInTheDocument()
    })
  })

  describe('adding override', () => {
    it('calls onAdd with correct payload when working day is selected', async () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      fireEvent.change(screen.getByTestId('override-date-input'), { target: { value: '2026-12-24' } })
      fireEvent.click(screen.getByTestId('override-working-radio'))
      fireEvent.change(screen.getByTestId('override-note-input'), { target: { value: 'Jobbar denna dag' } })
      fireEvent.click(screen.getByTestId('add-override-button'))

      await waitFor(() => {
        expect(mockOnAdd).toHaveBeenCalledWith({
          workspaceId: 'ws-1',
          date: '2026-12-24',
          isWorkingDay: true,
          note: 'Jobbar denna dag',
        })
      })
    })

    it('calls onAdd with correct payload when off day is selected', async () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      fireEvent.change(screen.getByTestId('override-date-input'), { target: { value: '2026-06-20' } })
      fireEvent.click(screen.getByTestId('override-off-radio'))
      fireEvent.click(screen.getByTestId('add-override-button'))

      await waitFor(() => {
        expect(mockOnAdd).toHaveBeenCalledWith({
          workspaceId: 'ws-1',
          date: '2026-06-20',
          isWorkingDay: false,
          note: null,
        })
      })
    })

    it('clears form after successful add', async () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      const dateInput = screen.getByTestId('override-date-input') as HTMLInputElement
      const noteInput = screen.getByTestId('override-note-input') as HTMLInputElement

      fireEvent.change(dateInput, { target: { value: '2026-12-24' } })
      fireEvent.change(noteInput, { target: { value: 'Test note' } })
      fireEvent.click(screen.getByTestId('add-override-button'))

      await waitFor(() => {
        expect(dateInput.value).toBe('')
        expect(noteInput.value).toBe('')
      })
    })

    it('disables submit button when date is empty', () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      const submitButton = screen.getByTestId('add-override-button') as HTMLButtonElement
      expect(submitButton.disabled).toBe(true)
    })

    it('does not call onAdd when the form is submitted with no date entered', async () => {
      render(
        <DayOverridesInput
          overrides={[]}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      // Submit the form directly (bypassing the disabled submit button) to
      // exercise the handler's own empty-date guard.
      fireEvent.submit(screen.getByTestId('add-override-form'))

      await waitFor(() => {
        expect(mockOnAdd).not.toHaveBeenCalled()
      })
    })
  })

  describe('removing override', () => {
    it('calls onRemove with correct id', async () => {
      render(
        <DayOverridesInput
          overrides={mockOverrides}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      fireEvent.click(screen.getByTestId('remove-override-do-1'))

      await waitFor(() => {
        expect(mockOnRemove).toHaveBeenCalledWith('do-1')
      })
    })

    it('swallows an onRemove failure instead of throwing (handled by the parent)', async () => {
      mockOnRemove.mockRejectedValueOnce(new Error('delete failed'))
      render(
        <DayOverridesInput
          overrides={mockOverrides}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      fireEvent.click(screen.getByTestId('remove-override-do-1'))

      await waitFor(() => {
        expect(mockOnRemove).toHaveBeenCalledWith('do-1')
      })
      // The item is still rendered — the component didn't crash on the rejection.
      expect(screen.getByTestId('override-item-do-1')).toBeInTheDocument()
    })
  })

  describe('loading state', () => {
    it('disables form during loading', () => {
      render(
        <DayOverridesInput
          overrides={[]}
          isLoading={true}
          onAdd={mockOnAdd}
          onRemove={mockOnRemove}
          workspaceId="ws-1"
        />
      )

      expect((screen.getByTestId('override-date-input') as HTMLInputElement).disabled).toBe(true)
      expect((screen.getByTestId('add-override-button') as HTMLButtonElement).disabled).toBe(true)
    })
  })
})