import { Button } from '@langgenius/dify-ui/button'
import { cn } from '@langgenius/dify-ui/cn'
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@langgenius/dify-ui/dropdown-menu'
import { toJpeg, toPng, toSvg } from 'html-to-image'
import { memo, useCallback, useState } from 'react'
import { useTranslation } from 'react-i18next'
import { getNodesBounds, useReactFlow } from 'reactflow'
import ImagePreview from '@/app/components/base/image-uploader/image-preview'
import { useStore } from '@/app/components/workflow/store'
import { downloadUrl } from '@/utils/download'
import { useNodesReadOnly } from '../hooks'
import TipPopup from './tip-popup'

function MoreActions() {
  const { t } = useTranslation()
  const { getNodesReadOnly } = useNodesReadOnly()
  const reactFlow = useReactFlow()

  const [open, setOpen] = useState(false)
  const [previewUrl, setPreviewUrl] = useState('')
  const [previewTitle, setPreviewTitle] = useState('')
  const knowledgeName = useStore((s) => s.knowledgeName)
  const appName = useStore((s) => s.appName)
  const isReadOnly = getNodesReadOnly()

  const handleExportImage = useCallback(
    async (type: 'png' | 'jpeg' | 'svg', currentWorkflow = false) => {
      if (!appName && !knowledgeName) return

      if (getNodesReadOnly()) return

      setOpen(false)
      const flowElement = document.querySelector('.react-flow__viewport') as HTMLElement
      if (!flowElement) return

      try {
        let filename = appName || knowledgeName
        const filter = (node: HTMLElement) => {
          if (node instanceof HTMLImageElement) return node.complete && node.naturalHeight !== 0

          return true
        }

        let dataUrl

        if (currentWorkflow) {
          const nodes = reactFlow.getNodes()
          const nodesBounds = getNodesBounds(nodes)

          const currentViewport = reactFlow.getViewport()

          const viewportWidth = window.innerWidth
          const viewportHeight = window.innerHeight
          const zoom = Math.min(
            viewportWidth / (nodesBounds.width + 100),
            viewportHeight / (nodesBounds.height + 100),
            1,
          )

          const centerX = nodesBounds.x + nodesBounds.width / 2
          const centerY = nodesBounds.y + nodesBounds.height / 2

          reactFlow.setViewport({
            x: viewportWidth / 2 - centerX * zoom,
            y: viewportHeight / 2 - centerY * zoom,
            zoom,
          })

          await new Promise((resolve) => setTimeout(resolve, 300))

          const padding = 50
          const contentWidth = nodesBounds.width + padding * 2
          const contentHeight = nodesBounds.height + padding * 2

          const exportOptions = {
            filter,
            backgroundColor: '#1a1a1a',
            pixelRatio: 2,
            width: contentWidth,
            height: contentHeight,
            style: {
              width: `${contentWidth}px`,
              height: `${contentHeight}px`,
              transform: `translate(${padding - nodesBounds.x}px, ${padding - nodesBounds.y}px)`,
              transformOrigin: 'top left',
            },
          }

          switch (type) {
            case 'png':
              dataUrl = await toPng(flowElement, exportOptions)
              break
            case 'jpeg':
              dataUrl = await toJpeg(flowElement, exportOptions)
              break
            case 'svg':
              dataUrl = await toSvg(flowElement, { filter })
              break
            default:
              dataUrl = await toPng(flowElement, exportOptions)
          }

          filename += '-whole-workflow'

          setTimeout(() => {
            reactFlow.setViewport(currentViewport)
          }, 500)
        } else {
          // Current viewport export (existing functionality)
          switch (type) {
            case 'png':
              dataUrl = await toPng(flowElement, { filter })
              break
            case 'jpeg':
              dataUrl = await toJpeg(flowElement, { filter })
              break
            case 'svg':
              dataUrl = await toSvg(flowElement, { filter })
              break
            default:
              dataUrl = await toPng(flowElement, { filter })
          }
        }

        const fileName = `${filename}.${type}`

        if (currentWorkflow) {
          setPreviewUrl(dataUrl)
          setPreviewTitle(fileName)
        }

        downloadUrl({ url: dataUrl, fileName })
      } catch (error) {
        console.error('Export image failed:', error)
      }
    },
    [getNodesReadOnly, appName, reactFlow, knowledgeName],
  )

  return (
    <>
      <DropdownMenu
        open={open}
        onOpenChange={(nextOpen) => {
          if (isReadOnly) {
            setOpen(false)
            return
          }
          setOpen(nextOpen)
        }}
      >
        <TipPopup title={t(($) => $['common.moreActions'], { ns: 'workflow' })}>
          <DropdownMenuTrigger
            render={
              <Button
                variant="ghost"
                size="small"
                aria-label={t(($) => $['common.moreActions'], { ns: 'workflow' })}
                disabled={isReadOnly}
                focusableWhenDisabled
                className={cn(
                  'size-8 p-0 text-text-tertiary hover:bg-state-base-hover hover:text-text-secondary',
                  isReadOnly &&
                    'cursor-not-allowed text-text-disabled hover:bg-transparent hover:text-text-disabled',
                )}
              />
            }
          >
            <span aria-hidden className="i-ri-more-fill size-4" />
          </DropdownMenuTrigger>
        </TipPopup>
        <DropdownMenuContent placement="right-end" popupClassName="min-w-[180px]">
          <div className="flex items-center gap-2 px-2 py-1 text-xs font-medium text-text-tertiary">
            <span aria-hidden className="i-ri-export-line size-3" />
            {t(($) => $['common.exportImage'], { ns: 'workflow' })}
          </div>
          <div className="px-2 py-1 text-xs font-medium text-text-tertiary">
            {t(($) => $['common.currentView'], { ns: 'workflow' })}
          </div>
          <DropdownMenuItem className="system-md-regular" onClick={() => handleExportImage('png')}>
            {t(($) => $['common.exportPNG'], { ns: 'workflow' })}
          </DropdownMenuItem>
          <DropdownMenuItem className="system-md-regular" onClick={() => handleExportImage('jpeg')}>
            {t(($) => $['common.exportJPEG'], { ns: 'workflow' })}
          </DropdownMenuItem>
          <DropdownMenuItem className="system-md-regular" onClick={() => handleExportImage('svg')}>
            {t(($) => $['common.exportSVG'], { ns: 'workflow' })}
          </DropdownMenuItem>

          <DropdownMenuSeparator className="mx-2" />

          <div className="px-2 py-1 text-xs font-medium text-text-tertiary">
            {t(($) => $['common.currentWorkflow'], { ns: 'workflow' })}
          </div>
          <DropdownMenuItem
            className="system-md-regular"
            onClick={() => handleExportImage('png', true)}
          >
            {t(($) => $['common.exportPNG'], { ns: 'workflow' })}
          </DropdownMenuItem>
          <DropdownMenuItem
            className="system-md-regular"
            onClick={() => handleExportImage('jpeg', true)}
          >
            {t(($) => $['common.exportJPEG'], { ns: 'workflow' })}
          </DropdownMenuItem>
          <DropdownMenuItem
            className="system-md-regular"
            onClick={() => handleExportImage('svg', true)}
          >
            {t(($) => $['common.exportSVG'], { ns: 'workflow' })}
          </DropdownMenuItem>
        </DropdownMenuContent>
      </DropdownMenu>

      {previewUrl && (
        <ImagePreview url={previewUrl} title={previewTitle} onCancel={() => setPreviewUrl('')} />
      )}
    </>
  )
}

export default memo(MoreActions)