import { useEffect } from 'react'

import { motion as m } from 'framer-motion'
import { useAtomValue } from 'jotai'
import {
  GalleryHorizontalEndIcon,
  MoreVerticalIcon,
  Trash2Icon,
  Paintbrush,
} from 'lucide-react'

import { twMerge } from 'tailwind-merge'

import { useCreateNewThread } from '@/hooks/useCreateNewThread'
import useDeleteThread from '@/hooks/useDeleteThread'
import useGetAllThreads from '@/hooks/useGetAllThreads'

import useGetAssistants from '@/hooks/useGetAssistants'
import { useGetDownloadedModels } from '@/hooks/useGetDownloadedModels'
import useSetActiveThread from '@/hooks/useSetActiveThread'

import { displayDate } from '@/utils/datetime'

import {
  activeThreadAtom,
  threadStatesAtom,
  threadsAtom,
} from '@/helpers/atoms/Thread.atom'

export default function ThreadList() {
  const threads = useAtomValue(threadsAtom)
  const threadStates = useAtomValue(threadStatesAtom)
  const { getAllThreads } = useGetAllThreads()
  const { assistants } = useGetAssistants()
  const { requestCreateNewThread } = useCreateNewThread()
  const activeThread = useAtomValue(activeThreadAtom)
  const { deleteThread, cleanThread } = useDeleteThread()
  const { downloadedModels } = useGetDownloadedModels()

  const { activeThreadId, setActiveThread: onThreadClick } =
    useSetActiveThread()

  useEffect(() => {
    getAllThreads()
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [])

  useEffect(() => {
    if (
      downloadedModels.length !== 0 &&
      threads.length === 0 &&
      assistants.length !== 0 &&
      !activeThread
    ) {
      requestCreateNewThread(assistants[0])
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [assistants, threads, downloadedModels, activeThread])

  return (
    <div className="px-3 py-4">
      {threads.length === 0 ? (
        <div className="px-4 py-8 text-center">
          <GalleryHorizontalEndIcon
            size={26}
            className="mx-auto mb-3 text-muted-foreground"
          />
          <h2 className="font-semibold">No Thread History</h2>
        </div>
      ) : (
        threads.map((thread, i) => {
          const lastMessage =
            threadStates[thread.id]?.lastMessage ?? 'No new message'
          return (
            <div
              key={i}
              className={twMerge(
                `group/message relative mb-1 flex cursor-pointer  flex-col transition-all hover:rounded-lg hover:bg-gray-100 hover:dark:bg-secondary/50`
              )}
              onClick={() => onThreadClick(thread)}
            >
              <div className="relative z-10 p-4 py-4">
                <div className="flex justify-between">
                  <h2 className="line-clamp-1 font-bold">{thread.title}</h2>
                  <p className="mb-1 line-clamp-1 text-xs leading-5 text-muted-foreground">
                    {thread.updated &&
                      displayDate(new Date(thread.updated).getTime())}
                  </p>
                </div>
                <p className="mt-1 line-clamp-1 text-xs text-gray-700 group-hover/message:max-w-[160px] dark:text-gray-300">
                  {lastMessage || 'No new message'}
                </p>
              </div>
              <div
                className={twMerge(
                  `group/icon invisible absolute bottom-2 right-2 z-20 rounded-lg p-1 text-muted-foreground hover:bg-gray-200 group-hover/message:visible hover:dark:bg-secondary`
                )}
              >
                <MoreVerticalIcon />
                <div className="invisible absolute right-0 z-20 w-40 overflow-hidden rounded-lg border border-border bg-background shadow-lg group-hover/icon:visible">
                  <div
                    className="flex cursor-pointer items-center space-x-2 px-4 py-2 hover:bg-secondary"
                    onClick={() => cleanThread(thread.id)}
                  >
                    <Paintbrush size={16} className="text-muted-foreground" />
                    <span className="text-bold text-black dark:text-muted-foreground">
                      Clean thread
                    </span>
                  </div>
                  <div
                    className="flex cursor-pointer items-center space-x-2 px-4 py-2 hover:bg-secondary"
                    onClick={() => deleteThread(thread.id)}
                  >
                    <Trash2Icon size={16} className="text-muted-foreground" />
                    <span className="text-bold text-black dark:text-muted-foreground">
                      Delete thread
                    </span>
                  </div>
                </div>
              </div>
              {/* {messages.length > 0 && (
              )} */}

              {activeThreadId === thread.id && (
                <m.div
                  className="absolute inset-0 left-0 h-full w-full rounded-lg bg-gray-100 p-4 dark:bg-secondary/50"
                  layoutId="active-thread"
                />
              )}
            </div>
          )
        })
      )}
    </div>
  )
}