import { ConversationResource } from '../../types'
import { PreselectedDirectMessagePerson } from '../../types/resources/direct_message_candidate'
import { MemberResource } from '../../types/resources/member'

export type MessageAvailableMembersLink =
  | { label: string; existingConversationId: number }
  | { label: string; recipients: PreselectedDirectMessagePerson[] }

export function resolveMessageAvailableMembersLink({
  availableMembers,
  existingConversations,
  canMessageAvailableMembers,
}: {
  availableMembers: Pick<MemberResource, 'id' | 'name' | 'avatar'>[]
  existingConversations: Pick<ConversationResource, 'id' | 'disabled'>[] | undefined
  canMessageAvailableMembers: boolean
}): MessageAvailableMembersLink | undefined {
  if (availableMembers.length === 0 || !existingConversations) return undefined

  const label =
    availableMembers.length === 1
      ? `Message ${availableMembers[0].name.split(' ')[0]}`
      : `Message the remaining ${availableMembers.length} people`

  const existingConversation = existingConversations[0]
  if (existingConversation) {
    return existingConversation.disabled
      ? undefined
      : { label, existingConversationId: Number(existingConversation.id) }
  }

  if (!canMessageAvailableMembers) return undefined

  return {
    label,
    recipients: availableMembers.map(m => ({
      id: m.id.toString(),
      name: m.name,
      avatar: m.avatar,
    })),
  }
}