import {
  ChatCompletionRole,
  MessageStatus,
  ThreadContent,
  ThreadMessage,
} from '@janhq/core'
import { atom } from 'jotai'

import {
  getActiveThreadIdAtom,
  updateThreadStateLastMessageAtom,
} from './Thread.atom'

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

/**
 * Return the chat messages for the current active conversation
 */
export const getCurrentChatMessagesAtom = atom<ThreadMessage[]>((get) => {
  const activeThreadId = get(getActiveThreadIdAtom)
  if (!activeThreadId) return []
  const messages = get(chatMessages)[activeThreadId]
  return messages ?? []
})

export const setConvoMessagesAtom = atom(
  null,
  (get, set, threadId: string, messages: ThreadMessage[]) => {
    const newData: Record<string, ThreadMessage[]> = {
      ...get(chatMessages),
    }
    newData[threadId] = messages
    set(chatMessages, newData)
  }
)

/**
 * Used for pagination. Add old messages to the current conversation
 */
export const addOldMessagesAtom = atom(
  null,
  (get, set, newMessages: ThreadMessage[]) => {
    const currentConvoId = get(getActiveThreadIdAtom)
    if (!currentConvoId) return

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

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

export const addNewMessageAtom = atom(
  null,
  (get, set, newMessage: ThreadMessage) => {
    const currentMessages = get(chatMessages)[newMessage.thread_id] ?? []
    const updatedMessages = [...currentMessages, newMessage]

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

    // Update thread last message
    if (newMessage.content.length)
      set(
        updateThreadStateLastMessageAtom,
        newMessage.thread_id,
        newMessage.content
      )
  }
)

export const deleteChatMessageAtom = atom(
  null,
  (get, set, threadId: string) => {
    const newData: Record<string, ThreadMessage[]> = {
      ...get(chatMessages),
    }
    newData[threadId] = []
    set(chatMessages, newData)
  }
)

export const cleanChatMessageAtom = atom(null, (get, set, id: string) => {
  const newData: Record<string, ThreadMessage[]> = {
    ...get(chatMessages),
  }
  newData[id] = newData[id]?.filter((e) => e.role === ChatCompletionRole.System)
  set(chatMessages, newData)
})

export const deleteMessageAtom = atom(null, (get, set, id: string) => {
  const newData: Record<string, ThreadMessage[]> = {
    ...get(chatMessages),
  }
  const threadId = get(getActiveThreadIdAtom)
  if (threadId) {
    newData[threadId] = newData[threadId].filter((e) => e.id !== id)
    set(chatMessages, newData)
  }
})

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

      const newData: Record<string, ThreadMessage[]> = {
        ...get(chatMessages),
      }
      newData[conversationId] = updatedMessages
      set(chatMessages, newData)
      // Update thread last message
      if (text.length)
        set(updateThreadStateLastMessageAtom, conversationId, text)
    }
  }
)