import { expect } from 'chai'
import React from 'react'
import { render, screen } from '@testing-library/react'

import Message from '../../../../../frontend/js/features/chat/components/message'
import { stubMathJax, tearDownMathJaxStubs } from './stubs'

describe('<Message />', function() {
  const currentUser = {
    id: 'fake_user',
    first_name: 'fake_user_first_name',
    email: 'fake@example.com'
  }

  beforeEach(function() {
    window.user = currentUser
    stubMathJax()
  })

  afterEach(function() {
    delete window.user
    tearDownMathJaxStubs()
  })

  it('renders a basic message', function() {
    const message = {
      contents: ['a message'],
      user: currentUser
    }

    render(<Message userId={currentUser.id} message={message} />)

    screen.getByText('a message')
  })

  it('renders a message with multiple contents', function() {
    const message = {
      contents: ['a message', 'another message'],
      user: currentUser
    }

    render(<Message userId={currentUser.id} message={message} />)

    screen.getByText('a message')
    screen.getByText('another message')
  })

  it('renders HTML links within messages', function() {
    const message = {
      contents: [
        'a message with a <a href="https://overleaf.com">link to Overleaf</a>'
      ],
      user: currentUser
    }

    render(<Message userId={currentUser.id} message={message} />)

    screen.getByRole('link', { name: 'https://overleaf.com' })
  })

  describe('when the message is from the user themselves', function() {
    const message = {
      contents: ['a message'],
      user: currentUser
    }

    it('does not render the user name nor the email', function() {
      render(<Message userId={currentUser.id} message={message} />)

      expect(screen.queryByText(currentUser.first_name)).to.not.exist
      expect(screen.queryByText(currentUser.email)).to.not.exist
    })
  })

  describe('when the message is from other user', function() {
    const otherUser = {
      id: 'other_user',
      first_name: 'other_user_first_name'
    }

    const message = {
      contents: ['a message'],
      user: otherUser
    }

    it('should render the other user name', function() {
      render(<Message userId={currentUser.id} message={message} />)

      screen.getByText(otherUser.first_name)
    })

    it('should render the other user email when their name is not available', function() {
      const msg = {
        contents: message.contents,
        user: {
          id: otherUser.id,
          email: 'other@example.com'
        }
      }

      render(<Message userId={currentUser.id} message={msg} />)

      expect(screen.queryByText(otherUser.first_name)).to.not.exist
      screen.getByText(msg.user.email)
    })
  })
})