import { atom } from 'jotai'
import { getActiveConvoIdAtom } from './Conversation.atom'

/**
 * Stores all chat messages for all conversations
 */
export const chatMessages = atom<Record<string, ChatMessage[]>>({})

export const currentChatMessagesAtom = atom<ChatMessage[]>((get) => {
  const activeConversationId = get(getActiveConvoIdAtom)
  if (!activeConversationId) return []
  return get(chatMessages)[activeConversationId] ?? []
})

export const addOldMessagesAtom = atom(
  null,
  (get, set, newMessages: ChatMessage[]) => {
    const currentConvoId = get(getActiveConvoIdAtom)
    if (!currentConvoId) return

    const currentMessages = get(chatMessages)[currentConvoId] ?? []
    const updatedMessages = [...currentMessages, ...newMessages]

    const newData: Record<string, ChatMessage[]> = {
      ...get(chatMessages),
    }
    newData[currentConvoId] = updatedMessages
    set(chatMessages, newData)
  }
)

export const addNewMessageAtom = atom(
  null,
  (get, set, newMessage: ChatMessage) => {
    const currentConvoId = get(getActiveConvoIdAtom)
    if (!currentConvoId) return

    const currentMessages = get(chatMessages)[currentConvoId] ?? []
    const updatedMessages = [newMessage, ...currentMessages]

    const newData: Record<string, ChatMessage[]> = {
      ...get(chatMessages),
    }
    newData[currentConvoId] = updatedMessages
    set(chatMessages, newData)
  }
)

export const deleteConversationMessage = atom(null, (get, set, id: string) => {
  const newData: Record<string, ChatMessage[]> = {
    ...get(chatMessages),
  }
  newData[id] = []
  set(chatMessages, newData)
})

export const updateMessageAtom = atom(
  null,
  (get, set, id: string, conversationId: string, text: string) => {
    const messages = get(chatMessages)[conversationId] ?? []
    const message = messages.find((e) => e.id === id)
    if (message) {
      message.text = text
      const updatedMessages = [...messages]

      const newData: Record<string, ChatMessage[]> = {
        ...get(chatMessages),
      }
      newData[conversationId] = updatedMessages
      set(chatMessages, newData)
    }
  }
)

/**
 * For updating the status of the last AI message that is pending
 */
export const updateLastMessageAsReadyAtom = atom(
  null,
  (get, set, id, text: string) => {
    const currentConvoId = get(getActiveConvoIdAtom)
    if (!currentConvoId) return

    const currentMessages = get(chatMessages)[currentConvoId] ?? []
    const messageToUpdate = currentMessages.find((e) => e.id === id)

    // if message is not found, do nothing
    if (!messageToUpdate) return

    const index = currentMessages.indexOf(messageToUpdate)
    const updatedMsg: ChatMessage = {
      ...messageToUpdate,
      status: MessageStatus.Ready,
      text: text,
    }

    currentMessages[index] = updatedMsg
    const newData: Record<string, ChatMessage[]> = {
      ...get(chatMessages),
    }
    newData[currentConvoId] = currentMessages
    set(chatMessages, newData)
  }
)