import React, { useCallback, useEffect, useMemo } from 'react'
import { useRecoilState, useSetRecoilState } from 'recoil'
import { nanoid } from 'nanoid'
import useInputImage from './hooks/useInputImage'
import { themeState } from './components/Header/ThemeChanger'
import Workspace from './components/Workspace'
import { fileState, serverConfigState, toastState } from './store/Atoms'
import { keepGUIAlive } from './utils'
import Header from './components/Header/Header'
import useHotKey from './hooks/useHotkey'
import { getServerConfig, isDesktop } from './adapters/inpainting'

const SUPPORTED_FILE_TYPE = [
  'image/jpeg',
  'image/png',
  'image/webp',
  'image/bmp',
  'image/tiff',
]

function App() {
  const [file, setFile] = useRecoilState(fileState)
  const [theme, setTheme] = useRecoilState(themeState)
  const setToastState = useSetRecoilState(toastState)
  const userInputImage = useInputImage()
  const setServerConfigState = useSetRecoilState(serverConfigState)

  // Set Input Image
  useEffect(() => {
    setFile(userInputImage)
  }, [userInputImage, setFile])

  // Keeping GUI Window Open
  useEffect(() => {
    const fetchData = async () => {
      const isRunDesktop = await isDesktop().then(res => res.text())
      if (isRunDesktop === 'True') {
        keepGUIAlive()
      }
    }
    fetchData()
  }, [])

  useEffect(() => {
    const fetchServerConfig = async () => {
      const serverConfig = await getServerConfig().then(res => res.json())
      console.log(serverConfig)
      setServerConfigState(serverConfig)
    }
    fetchServerConfig()
  }, [])

  // Dark Mode Hotkey
  useHotKey(
    'shift+d',
    () => {
      const newTheme = theme === 'light' ? 'dark' : 'light'
      setTheme(newTheme)
    },
    {},
    [theme]
  )

  useEffect(() => {
    document.body.setAttribute('data-theme', theme)
  }, [theme])

  const workspaceId = useMemo(() => {
    return nanoid()
  }, [file])

  ///

  const [isDragging, setIsDragging] = React.useState(false)
  const dragCounter = React.useRef(0)

  const handleDrag = React.useCallback(event => {
    event.preventDefault()
    event.stopPropagation()
  }, [])

  const handleDragIn = React.useCallback(event => {
    event.preventDefault()
    event.stopPropagation()
    dragCounter.current += 1
    if (event.dataTransfer.items && event.dataTransfer.items.length > 0) {
      setIsDragging(true)
    }
  }, [])

  const handleDragOut = React.useCallback(event => {
    event.preventDefault()
    event.stopPropagation()
    dragCounter.current -= 1
    if (dragCounter.current > 0) return
    setIsDragging(false)
  }, [])

  const handleDrop = React.useCallback(
    event => {
      event.preventDefault()
      event.stopPropagation()
      setIsDragging(false)
      if (event.dataTransfer.files && event.dataTransfer.files.length > 0) {
        if (event.dataTransfer.files.length > 1) {
          setToastState({
            open: true,
            desc: 'Please drag and drop only one file',
            state: 'error',
            duration: 3000,
          })
        } else {
          const dragFile = event.dataTransfer.files[0]
          const fileType = dragFile.type
          if (SUPPORTED_FILE_TYPE.includes(fileType)) {
            setFile(dragFile)
          } else {
            setToastState({
              open: true,
              desc: 'Please drag and drop an image file',
              state: 'error',
              duration: 3000,
            })
          }
        }
        event.dataTransfer.clearData()
      }
    },
    [setToastState, setFile]
  )

  const onPaste = useCallback((event: any) => {
    // TODO: when sd side panel open, ctrl+v not work
    // https://htmldom.dev/paste-an-image-from-the-clipboard/
    if (!event.clipboardData) {
      return
    }
    const clipboardItems = event.clipboardData.items
    const items: DataTransferItem[] = [].slice
      .call(clipboardItems)
      .filter((item: DataTransferItem) => {
        // Filter the image items only
        return item.type.indexOf('image') !== -1
      })

    if (items.length === 0) {
      return
    }

    event.preventDefault()
    event.stopPropagation()

    // TODO: add confirm dialog

    const item = items[0]
    // Get the blob of image
    const blob = item.getAsFile()
    if (blob) {
      setFile(blob)
    }
  }, [])

  React.useEffect(() => {
    window.addEventListener('dragenter', handleDragIn)
    window.addEventListener('dragleave', handleDragOut)
    window.addEventListener('dragover', handleDrag)
    window.addEventListener('drop', handleDrop)
    window.addEventListener('paste', onPaste)
    return function cleanUp() {
      window.removeEventListener('dragenter', handleDragIn)
      window.removeEventListener('dragleave', handleDragOut)
      window.removeEventListener('dragover', handleDrag)
      window.removeEventListener('drop', handleDrop)
      window.removeEventListener('paste', onPaste)
    }
  })

  return (
    <div className="lama-cleaner">
      <Header />
      <Workspace key={workspaceId} />
    </div>
  )
}

export default App