import type { IterationNodeType } from './types'
import type {
  OnSelectBlock,
} from '@/app/components/workflow/types'
import { cn } from '@langgenius/dify-ui/cn'
import {
  RiAddLine,
} from '@remixicon/react'
import {
  memo,
  useCallback,
} from 'react'
import { useTranslation } from 'react-i18next'
import BlockSelector from '@/app/components/workflow/block-selector'
import {
  BlockEnum,
} from '@/app/components/workflow/types'
import {
  useAvailableBlocks,
  useNodesInteractions,
  useNodesReadOnly,
} from '../../hooks'

type AddBlockProps = {
  iterationNodeId: string
  iterationNodeData: IterationNodeType
}
const AddBlock = ({
  iterationNodeData,
}: AddBlockProps) => {
  const { t } = useTranslation()
  const { nodesReadOnly } = useNodesReadOnly()
  const { handleNodeAdd } = useNodesInteractions()
  const { availableNextBlocks } = useAvailableBlocks(BlockEnum.Start, true)

  const handleSelect = useCallback<OnSelectBlock>((type, pluginDefaultValue) => {
    handleNodeAdd(
      {
        nodeType: type,
        pluginDefaultValue,
      },
      {
        prevNodeId: iterationNodeData.start_node_id,
        prevNodeSourceHandle: 'source',
      },
    )
  }, [handleNodeAdd, iterationNodeData.start_node_id])

  const renderTriggerElement = useCallback((open: boolean) => {
    return (
      <div className={cn(
        'relative inline-flex h-8 cursor-pointer items-center rounded-lg border-[0.5px] border-components-button-secondary-border bg-components-button-secondary-bg px-3 system-sm-medium text-components-button-secondary-text shadow-xs backdrop-blur-[5px] hover:bg-components-button-secondary-bg-hover',
        `${nodesReadOnly && 'cursor-not-allowed! bg-components-button-secondary-bg-disabled'}`,
        open && 'bg-components-button-secondary-bg-hover',
      )}
      >
        <RiAddLine className="mr-1 size-4" />
        {t('common.addBlock', { ns: 'workflow' })}
      </div>
    )
  }, [nodesReadOnly, t])

  return (
    <div className="absolute top-7 left-14 z-10 flex h-8 items-center">
      <div className="group/insert relative h-0.5 w-16 bg-gray-300">
        <div className="absolute top-1/2 right-0 h-2 w-0.5 -translate-y-1/2 bg-primary-500"></div>
      </div>
      <BlockSelector
        disabled={nodesReadOnly}
        onSelect={handleSelect}
        trigger={renderTriggerElement}
        triggerInnerClassName="inline-flex"
        popupClassName="min-w-[256px]!"
        availableBlocksTypes={availableNextBlocks}
      />
    </div>
  )
}

export default memo(AddBlock)
