dify/web/app/components/workflow/nodes/llm/components/config-prompt.tsx

'use client'
import type { FC } from 'react'
import React, { useCallback } from 'react'
import { useTranslation } from 'react-i18next'
import produce from 'immer'
import { ReactSortable } from 'react-sortablejs'
import { v4 as uuid4 } from 'uuid'
import type { ModelConfig, PromptItem, ValueSelector, Var, Variable } from '../../../types'
import { EditionType, PromptRole } from '../../../types'
import useAvailableVarList from '../../_base/hooks/use-available-var-list'
import { useWorkflowStore } from '../../../store'
import ConfigPromptItem from './config-prompt-item'
import cn from '@/utils/classnames'
import Editor from '@/app/components/workflow/nodes/_base/components/prompt/editor'
import AddButton from '@/app/components/workflow/nodes/_base/components/add-button'
import { DragHandle } from '@/app/components/base/icons/src/vender/line/others'

const i18nPrefix = 'workflow.nodes.llm'

type Props = {
  readOnly: boolean
  nodeId: string
  filterVar: (payload: Var, selector: ValueSelector) => boolean
  isChatModel: boolean
  isChatApp: boolean
  payload: PromptItem | PromptItem[]
  onChange: (payload: PromptItem | PromptItem[]) => void
  isShowContext: boolean
  hasSetBlockStatus: {
    context: boolean
    history: boolean
    query: boolean
  }
  varList?: Variable[]
  handleAddVariable: (payload: any) => void
  modelConfig: ModelConfig
}

const ConfigPrompt: FC<Props> = ({
  readOnly,
  nodeId,
  filterVar,
  isChatModel,
  isChatApp,
  payload,
  onChange,
  isShowContext,
  hasSetBlockStatus,
  varList = [],
  handleAddVariable,
  modelConfig,
}) => {
  const { t } = useTranslation()
  const workflowStore = useWorkflowStore()
  const {
    setControlPromptEditorRerenderKey,
  } = workflowStore.getState()
  const payloadWithIds = (isChatModel && Array.isArray(payload))
    ? payload.map((item) => {
      const id = uuid4()
      return {
        id: item.id || id,
        p: {
          ...item,
          id: item.id || id,
        },
      }
    })
    : []
  const {
    availableVars,
    availableNodesWithParent,
  } = useAvailableVarList(nodeId, {
    onlyLeafNodeVar: false,
    filterVar,
  })

  const handleChatModePromptChange = useCallback((index: number) => {
    return (prompt: string) => {
      const newPrompt = produce(payload as PromptItem[], (draft) => {
        draft[index][draft[index].edition_type === EditionType.jinja2 ? 'jinja2_text' : 'text'] = prompt
      })
      onChange(newPrompt)
    }
  }, [onChange, payload])

  const handleChatModeEditionTypeChange = useCallback((index: number) => {
    return (editionType: EditionType) => {
      const newPrompt = produce(payload as PromptItem[], (draft) => {
        draft[index].edition_type = editionType
      })
      onChange(newPrompt)
    }
  }, [onChange, payload])

  const handleChatModeMessageRoleChange = useCallback((index: number) => {
    return (role: PromptRole) => {
      const newPrompt = produce(payload as PromptItem[], (draft) => {
        draft[index].role = role
      })
      onChange(newPrompt)
    }
  }, [onChange, payload])

  const handleAddPrompt = useCallback(() => {
    const newPrompt = produce(payload as PromptItem[], (draft) => {
      if (draft.length === 0) {
        draft.push({ role: PromptRole.system, text: '' })

        return
      }
      const isLastItemUser = draft[draft.length - 1].role === PromptRole.user
      draft.push({ role: isLastItemUser ? PromptRole.assistant : PromptRole.user, text: '' })
    })
    onChange(newPrompt)
  }, [onChange, payload])

  const handleRemove = useCallback((index: number) => {
    return () => {
      const newPrompt = produce(payload as PromptItem[], (draft) => {
        draft.splice(index, 1)
      })
      onChange(newPrompt)
    }
  }, [onChange, payload])

  const handleCompletionPromptChange = useCallback((prompt: string) => {
    const newPrompt = produce(payload as PromptItem, (draft) => {
      draft[draft.edition_type === EditionType.jinja2 ? 'jinja2_text' : 'text'] = prompt
    })
    onChange(newPrompt)
  }, [onChange, payload])

  const handleGenerated = useCallback((prompt: string) => {
    handleCompletionPromptChange(prompt)
    setTimeout(() => setControlPromptEditorRerenderKey(Date.now()))
  }, [handleCompletionPromptChange, setControlPromptEditorRerenderKey])

  const handleCompletionEditionTypeChange = useCallback((editionType: EditionType) => {
    const newPrompt = produce(payload as PromptItem, (draft) => {
      draft.edition_type = editionType
    })
    onChange(newPrompt)
  }, [onChange, payload])

  const canChooseSystemRole = (() => {
    if (isChatModel && Array.isArray(payload))
      return !payload.find(item => item.role === PromptRole.system)

    return false
  })()
  return (
    <div>
      {(isChatModel && Array.isArray(payload))
        ? (
          <div>
            <div className='space-y-2'>
              <ReactSortable className="space-y-1"
                list={payloadWithIds}
                setList={(list) => {
                  if ((payload as PromptItem[])?.[0]?.role === PromptRole.system && list[0].p?.role !== PromptRole.system)
                    return

                  onChange(list.map(item => item.p))
                }}
                handle='.handle'
                ghostClass="opacity-50"
                animation={150}
              >
                {
                  (payload as PromptItem[]).map((item, index) => {
                    const canDrag = (() => {
                      if (readOnly)
                        return false

                      if (index === 0 && item.role === PromptRole.system)
                        return false

                      return true
                    })()
                    return (
                      <div key={item.id || index} className='relative group'>
                        {canDrag && <DragHandle className='group-hover:block hidden absolute left-[-14px] top-2 w-3.5 h-3.5 text-gray-400' />}
                        <ConfigPromptItem
                          className={cn(canDrag && 'handle')}
                          headerClassName={cn(canDrag && 'cursor-grab')}
                          canNotChooseSystemRole={!canChooseSystemRole}
                          canRemove={payload.length > 1 && !(index === 0 && item.role === PromptRole.system)}
                          readOnly={readOnly}
                          id={item.id!}
                          handleChatModeMessageRoleChange={handleChatModeMessageRoleChange(index)}
                          isChatModel={isChatModel}
                          isChatApp={isChatApp}
                          payload={item}
                          onPromptChange={handleChatModePromptChange(index)}
                          onEditionTypeChange={handleChatModeEditionTypeChange(index)}
                          onRemove={handleRemove(index)}
                          isShowContext={isShowContext}
                          hasSetBlockStatus={hasSetBlockStatus}
                          availableVars={availableVars}
                          availableNodes={availableNodesWithParent}
                          varList={varList}
                          handleAddVariable={handleAddVariable}
                          modelConfig={modelConfig}
                        />
                      </div>
                    )
                  })
                }
              </ReactSortable>
            </div>
            <AddButton
              className='mt-2'
              text={t(`${i18nPrefix}.addMessage`)}
              onClick={handleAddPrompt}
            />
          </div>
        )
        : (
          <div>
            <Editor
              instanceId={`${nodeId}-chat-workflow-llm-prompt-editor`}
              title={<span className='capitalize'>{t(`${i18nPrefix}.prompt`)}</span>}
              value={((payload as PromptItem).edition_type === EditionType.basic || !(payload as PromptItem).edition_type) ? (payload as PromptItem).text : ((payload as PromptItem).jinja2_text || '')}
              onChange={handleCompletionPromptChange}
              readOnly={readOnly}
              isChatModel={isChatModel}
              isChatApp={isChatApp}
              isShowContext={isShowContext}
              hasSetBlockStatus={hasSetBlockStatus}
              nodesOutputVars={availableVars}
              availableNodes={availableNodesWithParent}
              isSupportPromptGenerator
              isSupportJinja
              editionType={(payload as PromptItem).edition_type}
              varList={varList}
              onEditionTypeChange={handleCompletionEditionTypeChange}
              handleAddVariable={handleAddVariable}
              onGenerated={handleGenerated}
              modelConfig={modelConfig}
            />
          </div>
        )}
    </div>
  )
}
export default React.memo(ConfigPrompt)