import { resolveMessageAvailableMembersLink } from '../../hooks/direct_messages/resolve_message_available_members_link'

describe('resolveMessageAvailableMembersLink', () => {
  const jim = { id: 1, name: 'Jim Halpert', avatar: 'jim.png' }
  const pam = { id: 2, name: 'Pam Beesly', avatar: 'pam.png' }

  it('returns undefined when there are no available members', () => {
    const link = resolveMessageAvailableMembersLink({
      availableMembers: [],
      existingConversations: [],
      canMessageAvailableMembers: true,
    })

    expect(link).toBeUndefined()
  })

  it('returns undefined while the existing-conversation lookup is still loading', () => {
    const link = resolveMessageAvailableMembersLink({
      availableMembers: [jim],
      existingConversations: undefined,
      canMessageAvailableMembers: true,
    })

    expect(link).toBeUndefined()
  })

  it('links to the existing conversation when one is found and not disabled', () => {
    const link = resolveMessageAvailableMembersLink({
      availableMembers: [jim],
      existingConversations: [{ id: 42, disabled: false }],
      canMessageAvailableMembers: false,
    })

    expect(link).toEqual({ label: 'Message Jim', existingConversationId: 42 })
  })

  it('returns undefined when the existing conversation is itself disabled', () => {
    const link = resolveMessageAvailableMembersLink({
      availableMembers: [jim],
      existingConversations: [{ id: 42, disabled: true }],
      canMessageAvailableMembers: true,
    })

    expect(link).toBeUndefined()
  })

  it('offers to start a new direct message when no conversation exists and the viewer can start one', () => {
    const link = resolveMessageAvailableMembersLink({
      availableMembers: [jim, pam],
      existingConversations: [],
      canMessageAvailableMembers: true,
    })

    expect(link).toEqual({
      label: 'Message the remaining 2 people',
      recipients: [
        { id: '1', name: 'Jim Halpert', avatar: 'jim.png' },
        { id: '2', name: 'Pam Beesly', avatar: 'pam.png' },
      ],
    })
  })

  it('returns undefined when no conversation exists and the viewer cannot start one', () => {
    const link = resolveMessageAvailableMembersLink({
      availableMembers: [jim],
      existingConversations: [],
      canMessageAvailableMembers: false,
    })

    expect(link).toBeUndefined()
  })
})