dify/web/app/components/workflow/nodes/iteration/default.ts

import { BlockEnum } from '../../types'
import type { NodeDefault } from '../../types'
import type { IterationNodeType } from './types'
import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/constants'
const i18nPrefix = 'workflow'

const nodeDefault: NodeDefault<IterationNodeType> = {
  defaultValue: {
    start_node_id: '',
    iterator_selector: [],
    output_selector: [],
    _children: [],
  },
  getAvailablePrevNodes(isChatMode: boolean) {
    const nodes = isChatMode
      ? ALL_CHAT_AVAILABLE_BLOCKS
      : ALL_COMPLETION_AVAILABLE_BLOCKS.filter(type => type !== BlockEnum.End)
    return nodes
  },
  getAvailableNextNodes(isChatMode: boolean) {
    const nodes = isChatMode ? ALL_CHAT_AVAILABLE_BLOCKS : ALL_COMPLETION_AVAILABLE_BLOCKS
    return nodes
  },
  checkValid(payload: IterationNodeType, t: any) {
    let errorMessages = ''

    if (!errorMessages && (!payload.iterator_selector || payload.iterator_selector.length === 0))
      errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.nodes.iteration.input`) })

    if (!errorMessages && (!payload.output_selector || payload.output_selector.length === 0))
      errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.nodes.iteration.output`) })

    return {
      isValid: !errorMessages,
      errorMessage: errorMessages,
    }
  },
}

export default nodeDefault