import { Fragment, useCallback, useState } from 'react'

import { fs, AppConfiguration, isSubdirectory } from '@janhq/core'
import { Button, Input } from '@janhq/uikit'
import { useAtomValue, useSetAtom } from 'jotai'
import { PencilIcon, FolderOpenIcon } from 'lucide-react'

import Loader from '@/containers/Loader'

export const SUCCESS_SET_NEW_DESTINATION = 'successSetNewDestination'

import ModalChangeDirectory, {
  showDirectoryConfirmModalAtom,
} from './ModalChangeDirectory'
import ModalChangeDestNotEmpty, {
  showDestNotEmptyConfirmAtom,
} from './ModalConfirmDestNotEmpty'
import ModalErrorSetDestGlobal, {
  showChangeFolderErrorAtom,
} from './ModalErrorSetDestGlobal'

import ModalSameDirectory, { showSamePathModalAtom } from './ModalSameDirectory'

import { janDataFolderPathAtom } from '@/helpers/atoms/AppConfig.atom'

const DataFolder = () => {
  const [showLoader, setShowLoader] = useState(false)
  const setShowDirectoryConfirm = useSetAtom(showDirectoryConfirmModalAtom)
  const setShowSameDirectory = useSetAtom(showSamePathModalAtom)
  const setShowChangeFolderError = useSetAtom(showChangeFolderErrorAtom)
  const showDestNotEmptyConfirm = useSetAtom(showDestNotEmptyConfirmAtom)

  const [destinationPath, setDestinationPath] = useState(undefined)
  const janDataFolderPath = useAtomValue(janDataFolderPathAtom)

  const onChangeFolderClick = useCallback(async () => {
    const destFolder = await window.core?.api?.selectDirectory()
    if (!destFolder) return

    if (destFolder === janDataFolderPath) {
      setShowSameDirectory(true)
      return
    }

    const appConfiguration: AppConfiguration =
      await window.core?.api?.getAppConfigurations()
    const currentJanDataFolder = appConfiguration.data_folder

    if (await isSubdirectory(currentJanDataFolder, destFolder)) {
      setShowSameDirectory(true)
      return
    }

    const newDestChildren: string[] = await fs.readdirSync(destFolder)
    const isNotEmpty =
      newDestChildren.filter((x) => x !== '.DS_Store').length > 0

    if (isNotEmpty) {
      setDestinationPath(destFolder)
      showDestNotEmptyConfirm(true)
      return
    }

    setDestinationPath(destFolder)
    setShowDirectoryConfirm(true)
  }, [
    janDataFolderPath,
    setShowDirectoryConfirm,
    setShowSameDirectory,
    showDestNotEmptyConfirm,
  ])

  const onUserConfirmed = useCallback(async () => {
    if (!destinationPath) return
    try {
      setShowLoader(true)
      const appConfiguration: AppConfiguration =
        await window.core?.api?.getAppConfigurations()
      const currentJanDataFolder = appConfiguration.data_folder
      appConfiguration.data_folder = destinationPath
      const { err } = await fs.syncFile(currentJanDataFolder, destinationPath)
      if (err) throw err
      await window.core?.api?.updateAppConfiguration(appConfiguration)
      console.debug(
        `File sync finished from ${currentJanDataFolder} to ${destinationPath}`
      )
      localStorage.setItem(SUCCESS_SET_NEW_DESTINATION, 'true')
      setTimeout(() => {
        setShowLoader(false)
      }, 1200)
      await window.core?.api?.relaunch()
    } catch (e) {
      console.error(e)
      setShowLoader(false)
      setShowChangeFolderError(true)
    }
  }, [destinationPath, setShowChangeFolderError])

  return (
    <Fragment>
      <div className="flex w-full items-start justify-between border-b border-border py-4 first:pt-0 last:border-none">
        <div className="flex-shrink-0 space-y-1.5">
          <div className="flex gap-x-2">
            <h6 className="text-sm font-semibold capitalize">
              Jan Data Folder
            </h6>
          </div>
          <p className="leading-relaxed">
            Where messages, model configurations, and other user data are
            placed.
          </p>
        </div>
        <div className="flex items-center gap-x-3">
          <div className="relative">
            <Input
              value={janDataFolderPath}
              className="w-[240px] pr-8"
              disabled
            />
            <FolderOpenIcon
              size={16}
              className="absolute right-2 top-1/2 z-10 -translate-y-1/2 cursor-pointer"
              onClick={() => window.core?.api?.openAppDirectory()}
            />
          </div>
          <Button
            size="sm"
            themes="outline"
            className="h-9 w-9 p-0"
            onClick={onChangeFolderClick}
          >
            <PencilIcon size={16} />
          </Button>
        </div>
      </div>
      <ModalSameDirectory onChangeFolderClick={onChangeFolderClick} />
      <ModalChangeDirectory
        destinationPath={destinationPath ?? ''}
        onUserConfirmed={onUserConfirmed}
      />
      <ModalErrorSetDestGlobal />
      <ModalChangeDestNotEmpty onUserConfirmed={onUserConfirmed} />
      {showLoader && <Loader description="Relocating Jan Data Folder..." />}
    </Fragment>
  )
}

export default DataFolder