import React from 'react'
import { render, screen } from '@testing-library/react'
import { ResponsePanel } from '../../components/ResponsePanel'
import type { SourceMetadata } from '../../types'

describe('ResponsePanel', () => {
  const mockSources: SourceMetadata[] = [
    {
      filename: 'document1.pdf',
      upload_date: '2024-01-15',
      content_summary: 'Introduction to RAG systems',
      chunk_index: 0,
    },
    {
      filename: 'document2.txt',
      upload_date: '2024-01-16',
      content_summary: 'Advanced retrieval techniques',
      chunk_index: 1,
    },
  ]

  it('shows empty state message when no answer and not loading', () => {
    render(<ResponsePanel answer={null} sources={[]} isLoading={false} error={null} />)
    expect(screen.getByText(/Ask a question to see the answer here/i)).toBeInTheDocument()
  })

  it('shows loading skeletons when isLoading is true', () => {
    render(<ResponsePanel answer={null} sources={[]} isLoading={true} error={null} />)
    const skeletonElements = screen.getAllByTestId('skeleton-line')
    expect(skeletonElements).toHaveLength(3)
    expect(skeletonElements[0]).toHaveClass('w-full')
    expect(skeletonElements[1]).toHaveClass('w-4/5')
    expect(skeletonElements[2]).toHaveClass('w-3/5')
  })

  it('shows error message when error prop is set', () => {
    render(
      <ResponsePanel
        answer={null}
        sources={[]}
        isLoading={false}
        error="Failed to fetch answer"
      />
    )
    expect(screen.getByText(/Failed to fetch answer/i)).toBeInTheDocument()
  })

  it('renders answer text as bullet points', () => {
    const answer = `- First point\n- Second point\n• Third point\nPlain text line`
    render(<ResponsePanel answer={answer} sources={[]} isLoading={false} error={null} />)
    expect(screen.getByText('First point')).toBeInTheDocument()
    expect(screen.getByText('Second point')).toBeInTheDocument()
    expect(screen.getByText('Third point')).toBeInTheDocument()
    expect(screen.getByText('Plain text line')).toBeInTheDocument()
  })

  it('renders source metadata cards', () => {
    render(
      <ResponsePanel
        answer="Test answer"
        sources={mockSources}
        isLoading={false}
        error={null}
      />
    )
    expect(screen.getByText('document1.pdf')).toBeInTheDocument()
    expect(screen.getByText('document2.txt')).toBeInTheDocument()
    expect(screen.getByText('2024-01-15')).toBeInTheDocument()
    expect(screen.getByText('Introduction to RAG systems')).toBeInTheDocument()
    expect(screen.getByText('Advanced retrieval techniques')).toBeInTheDocument()
  })

  it('does not show sources section when sources array is empty', () => {
    render(<ResponsePanel answer="Test answer" sources={[]} isLoading={false} error={null} />)
    expect(screen.queryByText(/sources/i)).not.toBeInTheDocument()
  })
})
