export function useTravelReimbursementSubmitComposer(ctx) {
  const {
    MAX_ATTACHMENTS,
    activeReviewPayload,
    activeSessionType,
    adjustComposerTextareaHeight,
    attachedFiles,
    buildAgentInsight,
    buildClientTimeContext,
    buildComposerBusinessTimeContext,
    buildComposerFilePreviews,
    buildDraftAssociationQueryPayload,
    buildErrorInsight,
    buildExpenseIntentConfirmationActions,
    buildExpenseIntentConfirmationMessage,
    buildExpenseSceneSelectionActions,
    buildExpenseSceneSelectionMessage,
    buildMessageMeta,
    buildOcrDocumentsFromReviewPayload,
    buildOcrFilePreviews,
    buildOcrSummary,
    buildOcrSummaryFromDocuments,
    buildReviewFormContextFromPayload,
    clearAttachedFiles,
    clearFlowSimulationTimers,
    completeFlowResult,
    completeFlowStep,
    composerBusinessTimeDraftTouched,
    composerBusinessTimeTags,
    composerDraft,
    composerUploadIntent,
    conversationId,
    createMessage,
    currentInsight,
    currentUser,
    draftClaimId,
    extractReviewAttachmentNames,
    failCurrentFlowStep,
    fetchExpenseClaims,
    fileInputRef,
    flowRunId,
    isKnowledgeSession,
    linkedRequest,
    mergeBusinessTimeIntoExtraContext,
    mergeFilePreviews,
    mergeFilesWithLimit,
    mergeUploadAttachmentNames,
    mergeUploadOcrDocuments,
    messages,
    nextTick,
    normalizeExpenseQueryPayload,
    normalizeOcrDocuments,
    persistSessionState,
    props,
    recognizeOcrFiles,
    refreshFlowRunDetail,
    rememberFilePreviews,
    replaceMessage,
    resetFlowRun,
    resolveComposerSubmitText,
    reviewInlineForm,
    runOrchestrator,
    scrollToBottom,
    sessionSwitchBusy,
    shouldRequestExpenseIntentConfirmation,
    shouldRequestExpenseSceneSelection,
    startExpenseClaimDraftFlowStep,
    startExpenseIntentConfirmationFlowPreview,
    startExpenseSceneSelectionFlowPreview,
    startFlowStep,
    startSemanticFlowPreview,
    submitting,
    syncComposerFilesToDraft,
    uploadDecisionDialogOpen,
    toast
  } = ctx
    function buildBackendMessage(rawText, fileNames, ocrSummary = '') {
      const parts = []
      const normalizedText = String(rawText || '').trim()

      if (normalizedText) {
        parts.push(normalizedText)
      } else if (fileNames.length) {
        parts.push(
          isKnowledgeSession.value
            ? `我上传了 ${fileNames.length} 份附件，请结合附件名称回答财务相关问题。`
            : `我上传了 ${fileNames.length} 份票据，请结合附件名称给出报销建议并整理待核对信息。`
        )
      }

      if (fileNames.length) {
        parts.push(`附件名称：${fileNames.join('、')}`)
      }

      if (ocrSummary) {
        parts.push(`OCR摘要：${ocrSummary}`)
      }

      if (props.entrySource === 'detail' && linkedRequest.value?.id) {
        parts.push(`关联单号：${linkedRequest.value.id}`)
      }

      return parts.join('\n')
    }

    async function submitComposer(options = {}) {
      if (submitting.value || sessionSwitchBusy.value) return null

      const rawText = resolveComposerSubmitText(options.rawText).trim()
      const systemGenerated = Boolean(options.systemGenerated)
      const resolvedUploadDisposition =
        String(options.uploadDisposition || '').trim() ||
        (composerUploadIntent.value === 'continue_existing' ? 'continue_existing' : '')
      const normalizedFiles = isKnowledgeSession.value ? [] : Array.from(options.files ?? attachedFiles.value)
      const fileMergeResult = mergeFilesWithLimit([], normalizedFiles, MAX_ATTACHMENTS)
      const files = fileMergeResult.files
      if (fileMergeResult.overflowCount > 0) {
        toast(`一次最多上传 ${MAX_ATTACHMENTS} 份附件，已保留前 ${MAX_ATTACHMENTS} 份。`)
      }
      if (!rawText && !files.length) return
      const fileNames = files.map((file) => file.name)

      const initialExtraContext = options.extraContext && typeof options.extraContext === 'object'
        ? { ...options.extraContext }
        : {}
      const selectedBusinessTimeContext = isKnowledgeSession.value ? null : buildComposerBusinessTimeContext()
      const extraContext = isKnowledgeSession.value
        ? initialExtraContext
        : mergeBusinessTimeIntoExtraContext(initialExtraContext, selectedBusinessTimeContext)
      const reviewAction = String(extraContext.review_action || '').trim()
      const hasSelectedExpenseType = Boolean(
        extraContext.expense_scene_selection ||
          String(extraContext.review_form_values?.expense_type || extraContext.review_form_values?.reimbursement_type || '').trim()
      )
      const hasConfirmedExpenseIntent = Boolean(extraContext.expense_intent_confirmed)
      const waitForExpenseIntentConfirmation = shouldRequestExpenseIntentConfirmation(rawText, {
        sessionType: activeSessionType.value,
        attachmentCount: files.length,
        reviewAction,
        hasSelectedExpenseType,
        hasConfirmedExpenseIntent
      })
      const waitForExpenseSceneSelection = !waitForExpenseIntentConfirmation && shouldRequestExpenseSceneSelection(rawText, {
        sessionType: activeSessionType.value,
        attachmentCount: files.length,
        reviewAction,
        hasSelectedExpenseType
      })
      const reviewAttachmentNames = extractReviewAttachmentNames(activeReviewPayload.value)
      const hasExistingDocumentEvent =
        Boolean(String(draftClaimId.value || '').trim()) || reviewAttachmentNames.length > 0
      const userText =
        String(options.userText || '').trim() ||
        rawText ||
        (isKnowledgeSession.value
          ? `我上传了 ${fileNames.length} 份附件，请帮我回答相关财务问题。`
          : resolvedUploadDisposition === 'continue_existing'
            ? `继续上传 ${fileNames.length} 份票据，并归集到当前单据。`
            : resolvedUploadDisposition === 'new_document'
              ? `新上传 ${fileNames.length} 份票据，请单独建立报销单。`
              : `我上传了 ${fileNames.length} 份票据，请帮我识别并整理报销建议。`)

      if (
        !isKnowledgeSession.value &&
        files.length &&
        hasExistingDocumentEvent &&
        !resolvedUploadDisposition &&
        !options.skipUploadDecisionPrompt &&
        !reviewAction
      ) {
        uploadDecisionDialogOpen.value = true
        return null
      }

      if (
        !isKnowledgeSession.value &&
        files.length &&
        !hasExistingDocumentEvent &&
        !resolvedUploadDisposition &&
        !options.skipDraftAssociationPrompt &&
        !reviewAction
      ) {
        try {
          const claims = await fetchExpenseClaims()
          const queryPayload = buildDraftAssociationQueryPayload(claims)
          if (queryPayload?.records?.length) {
            resetFlowRun()
            if (!options.skipUserMessage) {
              messages.value.push(createMessage('user', userText, fileNames))
            }
            messages.value.push(createMessage(
              'assistant',
              `我找到 ${queryPayload.records.length} 张可关联的草稿/待补单据。请先选择这批附件要归集到哪张单据，我再开始识别附件。`,
              [],
              {
                meta: ['等待选择关联单据'],
                queryPayload
              }
            ))
            composerDraft.value = ''
            composerBusinessTimeTags.value = []
            composerBusinessTimeDraftTouched.value = false
            nextTick(() => {
              adjustComposerTextareaHeight()
              scrollToBottom()
            })
            persistSessionState()
            return null
          }
        } catch (error) {
          console.warn('Failed to load draft claims before attachment recognition:', error)
          toast(error?.message || '查询可关联草稿失败，已继续按新单据识别。')
        }
      }

      resetFlowRun()
      if (rawText && !reviewAction) {
        startFlowStep('intent', '正在识别业务意图...')
        if (waitForExpenseIntentConfirmation) {
          startExpenseIntentConfirmationFlowPreview(rawText)
        } else if (waitForExpenseSceneSelection) {
          startExpenseSceneSelectionFlowPreview(rawText)
        } else {
          startSemanticFlowPreview(rawText, { attachmentCount: files.length })
        }
      }

      const filePreviews = buildComposerFilePreviews(files)
      rememberFilePreviews(filePreviews)

      // 只有在非静默模式下才添加用户消息
      if (!options.skipUserMessage) {
        messages.value.push(createMessage('user', userText, fileNames))
      }

      if (waitForExpenseIntentConfirmation) {
        messages.value.push(createMessage('assistant', buildExpenseIntentConfirmationMessage(rawText), [], {
          meta: ['等待确认意图'],
          suggestedActions: buildExpenseIntentConfirmationActions(rawText)
        }))
        composerDraft.value = ''
        composerBusinessTimeTags.value = []
        composerBusinessTimeDraftTouched.value = false
        clearAttachedFiles()
        if (fileInputRef.value) {
          fileInputRef.value.value = ''
        }
        nextTick(() => {
          adjustComposerTextareaHeight()
          scrollToBottom()
        })
        return null
      }

      if (waitForExpenseSceneSelection) {
        messages.value.push(createMessage('assistant', buildExpenseSceneSelectionMessage(rawText), [], {
          meta: ['等待选择场景'],
          suggestedActions: buildExpenseSceneSelectionActions(rawText)
        }))
        composerDraft.value = ''
        composerBusinessTimeTags.value = []
        composerBusinessTimeDraftTouched.value = false
        clearAttachedFiles()
        if (fileInputRef.value) {
          fileInputRef.value.value = ''
        }
        nextTick(() => {
          adjustComposerTextareaHeight()
          scrollToBottom()
        })
        return null
      }

      const pendingMessage = createMessage(
        'assistant',
        options.pendingText || (
          isKnowledgeSession.value
            ? '正在整理财务知识答案...'
            : '正在识别并整理右侧核对信息...'
        ),
        [],
        {
          meta: ['处理中']
        }
      )
      messages.value.push(pendingMessage)

      composerDraft.value = ''
      composerBusinessTimeTags.value = []
      composerBusinessTimeDraftTouched.value = false
      clearAttachedFiles()
      if (fileInputRef.value) {
        fileInputRef.value.value = ''
      }
      nextTick(adjustComposerTextareaHeight)

      submitting.value = true
      nextTick(scrollToBottom)

      let responsePayload = null

      try {
        const user = currentUser.value || {}
        let ocrPayload = null
        let ocrSummary = ''
        let ocrDocuments = []
        let ocrFilePreviews = []

        if (files.length) {
          const ocrStartedAt = Date.now()
          startFlowStep('ocr', { detail: `正在识别 ${files.length} 份附件...`, startedAt: ocrStartedAt })
          try {
            ocrPayload = await recognizeOcrFiles(files)
            ocrSummary = buildOcrSummary(ocrPayload)
            ocrDocuments = normalizeOcrDocuments(ocrPayload)
            ocrFilePreviews = buildOcrFilePreviews(ocrPayload)
            rememberFilePreviews(ocrFilePreviews)
            completeFlowStep('ocr', `识别到 ${ocrDocuments.length || files.length} 张票据`, Date.now() - ocrStartedAt)
          } catch (error) {
            console.warn('OCR request failed:', error)
            completeFlowStep('ocr', 'OCR识别失败，已继续使用附件名称', Date.now() - ocrStartedAt)
          }
        }

        let effectiveFileNames = [...fileNames]
        let effectiveOcrDocuments = [...ocrDocuments]
        let effectiveOcrSummary = ocrSummary

        if (resolvedUploadDisposition === 'continue_existing') {
          extraContext.review_action = 'link_to_existing_draft'
          const inheritedReviewContext = buildReviewFormContextFromPayload(
            activeReviewPayload.value,
            reviewInlineForm.value
          )
          if (inheritedReviewContext.review_form_values) {
            extraContext.review_form_values = {
              ...inheritedReviewContext.review_form_values,
              ...(extraContext.review_form_values && typeof extraContext.review_form_values === 'object'
                ? extraContext.review_form_values
                : {})
            }
          }
          if (inheritedReviewContext.business_time_context && !extraContext.business_time_context) {
            extraContext.business_time_context = inheritedReviewContext.business_time_context
          }
          effectiveFileNames = mergeUploadAttachmentNames(reviewAttachmentNames, fileNames)
          effectiveOcrDocuments = mergeUploadOcrDocuments(
            buildOcrDocumentsFromReviewPayload(activeReviewPayload.value),
            ocrDocuments
          )
          effectiveOcrSummary = buildOcrSummaryFromDocuments(effectiveOcrDocuments)
        } else if (resolvedUploadDisposition === 'new_document') {
          extraContext.review_action = 'create_new_claim_from_documents'
        }

        startExpenseClaimDraftFlowStep(String(extraContext.review_action || '').trim(), {
          attachmentCount: effectiveFileNames.length,
          waitForSceneSelection: waitForExpenseSceneSelection
        })

        const backendMessage = buildBackendMessage(rawText, effectiveFileNames, effectiveOcrSummary)
        const payload = await runOrchestrator(
          {
            source: 'user_message',
            user_id: user.username || user.name || 'anonymous',
            conversation_id: conversationId.value || null,
            message: backendMessage,
            context_json: {
              role_codes: Array.isArray(user.roleCodes) ? user.roleCodes : [],
              is_admin: Boolean(user.isAdmin),
              name: user.name || '',
              role: user.role || '',
              department: user.department || user.departmentName || '',
              department_name: user.department || user.departmentName || '',
              position: user.position || '',
              grade: user.grade || '',
              employee_no: user.employeeNo || user.employee_no || '',
              manager_name: user.managerName || user.manager_name || '',
              employee_location: user.location || '',
              cost_center: user.costCenter || user.cost_center || '',
              finance_owner_name: user.financeOwnerName || user.finance_owner_name || '',
              employee_risk_profile: user.riskProfile && typeof user.riskProfile === 'object' ? user.riskProfile : {},
              ...buildClientTimeContext(),
              session_type: activeSessionType.value,
              entry_source: props.entrySource,
              user_input_text: systemGenerated ? '' : rawText,
              attachment_names: effectiveFileNames,
              attachment_count: effectiveFileNames.length,
              draft_claim_id: isKnowledgeSession.value ? undefined : draftClaimId.value || undefined,
              ocr_summary: effectiveOcrSummary,
              ocr_documents: effectiveOcrDocuments,
              ...(linkedRequest.value && !isKnowledgeSession.value ? { request_context: linkedRequest.value } : {}),
              ...extraContext
            }
          },
          isKnowledgeSession.value
            ? {
                timeoutMs: 18000,
                timeoutMessage: '知识问答整理超时，已停止等待。建议缩小问题范围或稍后重试。'
              }
            : {}
        )
        responsePayload = payload
        flowRunId.value = String(payload?.run_id || '').trim()
        let flowRunDetail = null
        if (flowRunId.value) {
          flowRunDetail = await refreshFlowRunDetail()
        }

        conversationId.value = String(payload?.conversation_id || '').trim() || conversationId.value
        draftClaimId.value =
          isKnowledgeSession.value
            ? ''
            : String(payload?.result?.draft_payload?.claim_id || '').trim() || draftClaimId.value

        replaceMessage(
          pendingMessage.id,
          createMessage('assistant', payload?.result?.answer || payload?.result?.message || '智能体已完成处理。', [], {
            meta: buildMessageMeta(payload, effectiveFileNames),
            citations: Array.isArray(payload?.result?.citations) ? payload.result.citations : [],
            suggestedActions: Array.isArray(payload?.result?.suggested_actions)
              ? payload.result.suggested_actions
              : [],
            queryPayload: normalizeExpenseQueryPayload(payload?.result?.query_payload),
            draftPayload: payload?.result?.draft_payload || null,
            reviewPayload: payload?.result?.review_payload || null,
            riskFlags: Array.isArray(payload?.result?.risk_flags) ? payload.result.risk_flags : []
          })
        )
        currentInsight.value = buildAgentInsight(
          payload,
          effectiveFileNames,
          mergeFilePreviews(filePreviews, ocrFilePreviews)
        )
        completeFlowResult(payload, flowRunDetail)

        const resolvedDraftClaimId = String(payload?.result?.draft_payload?.claim_id || draftClaimId.value || '').trim()
        if (!isKnowledgeSession.value && resolvedDraftClaimId && files.length) {
          try {
            await syncComposerFilesToDraft(resolvedDraftClaimId, files)
          } catch (error) {
            console.warn('Failed to persist composer attachments to draft claim:', error)
            toast(error?.message || '票据已识别，但附件原件保存失败，请重试上传。')
          }
        }
      } catch (error) {
        clearFlowSimulationTimers()
        failCurrentFlowStep(error)
        replaceMessage(
          pendingMessage.id,
          createMessage(
            'assistant',
            error?.message || '无法连接后端 Orchestrator，请稍后重试。',
            [],
            {
              meta: ['调用失败']
            }
          )
        )
        currentInsight.value = buildErrorInsight(error, fileNames)
      } finally {
        submitting.value = false
        composerUploadIntent.value = ''
        nextTick(scrollToBottom)
      }

      return responsePayload
    }


  return {
    submitComposerInternal: submitComposer
  }
}