//
//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

package service

import (
	"archive/zip"
	"bytes"
	"context"
	"encoding/csv"
	"encoding/json"
	"encoding/xml"
	"errors"
	"fmt"
	"io"
	"math"
	"math/rand"
	"path/filepath"
	"ragflow/internal/common"
	"ragflow/internal/dao"
	"ragflow/internal/engine"
	redisengine "ragflow/internal/engine/redis"
	"ragflow/internal/engine/types"
	enginetypes "ragflow/internal/engine/types"
	"ragflow/internal/entity"
	"ragflow/internal/entity/models"
	"ragflow/internal/server"
	"ragflow/internal/service/nlp"
	"ragflow/internal/storage"
	"ragflow/internal/utility"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"time"

	"github.com/cespare/xxhash/v2"
	"github.com/google/uuid"
	"go.uber.org/zap"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

var (
	datasetAllowedChunkMethods = map[string]struct{}{
		"naive":        {},
		"book":         {},
		"email":        {},
		"laws":         {},
		"manual":       {},
		"one":          {},
		"paper":        {},
		"picture":      {},
		"presentation": {},
		"qa":           {},
		"resume":       {},
		"table":        {},
		"tag":          {},
	}
	datasetSupportedAvatarMIMETypes = map[string]struct{}{
		"image/jpeg": {},
		"image/png":  {},
	}
	datasetAllowedOrderByFields = map[string]struct{}{
		"create_time": {},
		"update_time": {},
	}
	datasetAllowedMetadataTypes = map[string]struct{}{
		"string": {},
		"list":   {},
		"time":   {},
		"number": {},
	}
	datasetChunkMethodErrorMessage = "Input should be 'naive', 'book', 'email', 'laws', 'manual', 'one', 'paper', 'picture', 'presentation', 'qa', 'resume', 'table' or 'tag'"
	validIndexTypes                = []string{"graph", "raptor", "mindmap"}
	indexTypeToTaskType            = map[string]string{"graph": "graphrag", "raptor": "raptor", "mindmap": "mindmap"}
	indexTypeToDisplayName         = map[string]string{"graph": "Graph", "raptor": "RAPTOR", "mindmap": "Mindmap"}
)

const (
	// Keep the legacy worker marker in queue payloads; persisted tasks use a real document ID.
	graphRaptorQueueDocID    = "graph_raptor_x"
	maximumPageNumber        = int64(100000)
	maximumTaskPageNumber    = int64(100000000)
	serverQueueNamePrefix    = "te"
	defaultEmbeddingCheckNum = 5

	graphPhaseResolutionDone = "resolution_done"
	graphPhaseCommunityDone  = "community_done"
)

// DatasetService implements the RESTful dataset APIs from dataset_api.py.
type DatasetService struct {
	kbDAO          *dao.KnowledgebaseDAO
	documentDAO    *dao.DocumentDAO
	connectorDAO   *dao.ConnectorDAO
	tenantDAO      *dao.TenantDAO
	tenantLLMDAO   *dao.TenantLLMDAO
	pipelineLogDAO *dao.PipelineOperationLogDAO
	userTenantDAO  *dao.UserTenantDAO
	taskDAO        *dao.TaskDAO
	searchService  *SearchService
	docEngine      engine.DocEngine
	embeddingCache *utility.EmbeddingLRU
	engineType     server.EngineType
}

// NewDatasetService creates a new datasets service.
func NewDatasetService() *DatasetService {
	cfg := server.GetConfig()
	engineType := server.EngineType("")
	if cfg != nil {
		engineType = cfg.DocEngine.Type
	}
	return &DatasetService{
		kbDAO:          dao.NewKnowledgebaseDAO(),
		documentDAO:    dao.NewDocumentDAO(),
		connectorDAO:   dao.NewConnectorDAO(),
		tenantDAO:      dao.NewTenantDAO(),
		tenantLLMDAO:   dao.NewTenantLLMDAO(),
		pipelineLogDAO: dao.NewPipelineOperationLogDAO(),
		userTenantDAO:  dao.NewUserTenantDAO(),
		taskDAO:        dao.NewTaskDAO(),
		searchService:  NewSearchService(),
		docEngine:      engine.Get(),
		embeddingCache: utility.NewEmbeddingLRU(1000),
		engineType:     engineType,
	}
}

func (s *DatasetService) UpdateDocumentMetadataConfig(userID, datasetID, documentID string, req map[string]interface{}) (*entity.Document, common.ErrorCode, error) {
	if _, err := s.kbDAO.GetByIDAndTenantID(datasetID, userID); err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("You don't own the dataset.")
		}
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}

	doc, err := s.documentDAO.GetByDocumentIDAndDatasetID(documentID, datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, fmt.Errorf("Document %s not found in dataset %s", documentID, datasetID)
		}
		return nil, common.CodeServerError, err
	}

	metadata, ok := req["metadata"]
	if !ok {
		return nil, common.CodeArgumentError, errors.New("metadata is required")
	}

	parserConfig := doc.ParserConfig
	if parserConfig == nil {
		parserConfig = entity.JSONMap{}
	}
	parserConfig["metadata"] = metadata

	if err := s.documentDAO.UpdateByID(doc.ID, map[string]interface{}{"parser_config": parserConfig}); err != nil {
		return nil, common.CodeExceptionError, err
	}

	updatedDoc, err := s.documentDAO.GetByID(doc.ID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("Document not found!")
		}
		return nil, common.CodeExceptionError, err
	}

	return updatedDoc, common.CodeSuccess, nil
}

// checkType reports whether indexType is supported by dataset index APIs.
func checkType(indexType string) bool {
	haveType := false
	for _, t := range validIndexTypes {
		if indexType == t {
			haveType = true
		}
	}
	return haveType
}

func (s *DatasetService) newRaptorOrGraphRagTask(sampleDoc *entity.Document, taskType string, taskDocID string, queueDocID string, docIDs []string) (*entity.Task, map[string]interface{}, error) {
	if docIDs == nil || len(docIDs) == 0 {
		docIDs = make([]string, 0)
	}
	if !checkIndexTaskType(taskType) {
		return nil, nil, errors.New("type should be graphrag, raptor or mindmap")
	}

	chunkingConfig, err := s.documentDAO.GetChunkingConfig(sampleDoc.ID)
	if err != nil {
		return nil, nil, err
	}

	hasher := xxhash.New()
	keys := make([]string, 0, len(chunkingConfig))
	for key := range chunkingConfig {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	for _, key := range keys {
		_, _ = hasher.Write([]byte(key))
		_, _ = hasher.Write([]byte{0})
		v, mErr := json.Marshal(chunkingConfig[key])
		if mErr != nil {
			return nil, nil, mErr
		}
		_, _ = hasher.Write(v)
		_, _ = hasher.Write([]byte{0})
	}

	taskID := strings.ReplaceAll(uuid.New().String(), "-", "")[:32]
	beginAt := time.Now().Truncate(time.Second)
	progressMsg := beginAt.Format("15:04:05") + " created task " + taskType

	for _, field := range []interface{}{taskDocID, maximumTaskPageNumber, maximumTaskPageNumber, taskType} {
		_, _ = hasher.Write([]byte(fmt.Sprint(field)))
	}
	digest := fmt.Sprintf("%016x", hasher.Sum64())
	task := &entity.Task{
		ID:          taskID,
		DocID:       taskDocID,
		FromPage:    maximumTaskPageNumber,
		ToPage:      maximumTaskPageNumber,
		TaskType:    taskType,
		ProgressMsg: &progressMsg,
		BeginAt:     &beginAt,
		Digest:      &digest,
	}

	queueMessage := map[string]interface{}{
		"id":           taskID,
		"doc_id":       queueDocID,
		"from_page":    maximumTaskPageNumber,
		"to_page":      maximumTaskPageNumber,
		"task_type":    taskType,
		"progress_msg": progressMsg,
		"begin_at":     beginAt.Format("2006-01-02 15:04:05"),
		"digest":       digest,
		"doc_ids":      docIDs,
	}

	return task, queueMessage, nil
}

func createDatasetIndexTaskInTx(tx *gorm.DB, task *entity.Task, queueDocID string) (*entity.Document, error) {
	if task == nil {
		return nil, errors.New("task is required")
	}
	if err := tx.Create(task).Error; err != nil {
		return nil, err
	}

	if queueDocID == "" {
		return nil, nil
	}

	var document entity.Document
	err := tx.Select("id", "progress_msg", "process_begin_at").Where("id = ?", queueDocID).First(&document).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, nil
		}
		return nil, err
	}

	beginAt := time.Now().Truncate(time.Second)
	if task.BeginAt != nil {
		beginAt = *task.BeginAt
	}
	if err := tx.Model(&entity.Document{}).Where("id = ?", queueDocID).Updates(map[string]interface{}{
		"progress_msg":     "Task is queued...",
		"process_begin_at": beginAt,
	}).Error; err != nil {
		return nil, err
	}

	return &document, nil
}

func enqueueDatasetIndexTask(priority int, queueMessage map[string]interface{}) error {
	redisClient := redisengine.Get()
	if redisClient == nil || !redisClient.QueueProduct(datasetIndexQueueName(priority), queueMessage) {
		return errors.New("Can't access Redis. Please check the Redis' status")
	}
	return nil
}

func cleanupFailedDatasetIndexTask(taskID string, updatedDocument *entity.Document, kbID string, indexType string) error {
	return dao.DB.Transaction(func(tx *gorm.DB) error {
		if err := tx.Unscoped().Where("id = ?", taskID).Delete(&entity.Task{}).Error; err != nil {
			return fmt.Errorf("delete task %s: %w", taskID, err)
		}

		if column := datasetIndexTaskIDColumn(indexType); kbID != "" && column != "" {
			if err := tx.Model(&entity.Knowledgebase{}).Where("id = ? AND "+column+" = ?", kbID, taskID).Update(column, nil).Error; err != nil {
				return fmt.Errorf("clear dataset task id %s: %w", taskID, err)
			}
		}

		if updatedDocument == nil {
			return nil
		}

		return tx.Model(&entity.Document{}).Where("id = ?", updatedDocument.ID).Updates(map[string]interface{}{
			"progress_msg":     updatedDocument.ProgressMsg,
			"process_begin_at": updatedDocument.ProcessBeginAt,
		}).Error
	})
}

func datasetIndexTaskIDColumn(indexType string) string {
	switch indexType {
	case "graph":
		return "graphrag_task_id"
	case "raptor":
		return "raptor_task_id"
	case "mindmap":
		return "mindmap_task_id"
	default:
		return ""
	}
}

func datasetIndexTaskFinishAtColumn(indexType string) string {
	switch indexType {
	case "graph":
		return "graphrag_task_finish_at"
	case "raptor":
		return "raptor_task_finish_at"
	case "mindmap":
		return "mindmap_task_finish_at"
	default:
		return ""
	}
}

func checkIndexTaskType(taskType string) bool {
	switch taskType {
	case "graphrag", "raptor", "mindmap":
		return true
	default:
		return false
	}
}

func datasetIndexTaskID(kb *entity.Knowledgebase, indexType string) string {
	if kb == nil {
		return ""
	}
	switch indexType {
	case "graph":
		if kb.GraphragTaskID != nil {
			return *kb.GraphragTaskID
		}
	case "raptor":
		if kb.RaptorTaskID != nil {
			return *kb.RaptorTaskID
		}
	case "mindmap":
		if kb.MindmapTaskID != nil {
			return *kb.MindmapTaskID
		}
	}
	return ""
}

func datasetIndexTaskIDUpdate(indexType, taskID string) map[string]interface{} {
	switch indexType {
	case "graph":
		return map[string]interface{}{"graphrag_task_id": taskID}
	case "raptor":
		return map[string]interface{}{"raptor_task_id": taskID}
	case "mindmap":
		return map[string]interface{}{"mindmap_task_id": taskID}
	default:
		return map[string]interface{}{}
	}
}

func datasetIndexTaskIDs(kb *entity.Knowledgebase) []string {
	if kb == nil {
		return nil
	}

	taskIDs := make([]string, 0, 3)
	for _, taskID := range []*string{kb.GraphragTaskID, kb.RaptorTaskID, kb.MindmapTaskID} {
		if taskID != nil && *taskID != "" {
			taskIDs = append(taskIDs, *taskID)
		}
	}
	return common.Deduplicate(taskIDs)
}

func datasetIndexQueueName(priority int) string {
	return fmt.Sprintf("%s.%d.common", serverQueueNamePrefix, priority)
}

func interfaceSlice(items ...string) []interface{} {
	result := make([]interface{}, len(items))
	for i, item := range items {
		result[i] = item
	}
	return result
}

func clearGraphPhaseMarkers(redisClient *redisengine.RedisClient, datasetID string) {
	if redisClient == nil || datasetID == "" {
		return
	}
	for _, phase := range []string{graphPhaseResolutionDone, graphPhaseCommunityDone} {
		if !redisClient.Delete(fmt.Sprintf("graphrag:phase:%s:%s", datasetID, phase)) {
			common.Warn("Failed to clear GraphRAG phase marker", zap.String("dataset_id", datasetID), zap.String("phase", phase))
		}
	}
}

// RunIndex Run an indexing task (graph/raptor/mindmap) for a dataset.
func (s *DatasetService) RunIndex(userID, datasetID, indexType string) (map[string]interface{}, common.ErrorCode, error) {
	if !checkType(indexType) {
		return nil, common.CodeDataError, fmt.Errorf("Invalid index type '%s'. Must be one of %v", indexType, validIndexTypes)
	}

	if datasetID == "" {
		return nil, common.CodeDataError, errors.New(`Lack of "Dataset ID"`)
	}
	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
		}
		return nil, common.CodeDataError, errors.New("Internal server error")
	}

	taskType := indexTypeToTaskType[indexType]
	displayName := indexTypeToDisplayName[indexType]

	documents, code, err := s.getDocumentsByDatasetForIndex(datasetID)
	if err != nil {
		return nil, code, err
	}
	_ = documents

	sampleDocument := documents[0]
	documentIDs := make([]string, len(documents))

	for i, doc := range documents {
		documentIDs[i] = doc.ID
	}

	task, queueMessage, err := s.newRaptorOrGraphRagTask(sampleDocument, taskType, sampleDocument.ID, graphRaptorQueueDocID, documentIDs)
	if err != nil {
		common.Warn("Failed to build dataset index task", zap.String("dataset_id", datasetID), zap.String("task_type", taskType), zap.Error(err))
		return nil, common.CodeDataError, errors.New("Internal server error")
	}

	var updatedDocument *entity.Document
	var dataErr error
	err = dao.DB.Transaction(func(tx *gorm.DB) error {
		var lockedKB entity.Knowledgebase
		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).
			Where("id = ? AND status = ?", kb.ID, string(entity.StatusValid)).
			First(&lockedKB).Error; err != nil {
			return err
		}

		existingTaskID := datasetIndexTaskID(&lockedKB, indexType)
		if existingTaskID != "" {
			var existingTask entity.Task
			taskErr := tx.Where("id = ?", existingTaskID).First(&existingTask).Error
			if taskErr != nil {
				if errors.Is(taskErr, gorm.ErrRecordNotFound) {
				} else {
					return taskErr
				}
			} else if existingTask.Progress != 1 && existingTask.Progress != -1 {
				dataErr = fmt.Errorf("Task %s in progress with status %v. A %s Task is already running.", existingTaskID, existingTask.Progress, displayName)
				return dataErr
			}
		}

		updatedDocument, err = createDatasetIndexTaskInTx(tx, task, graphRaptorQueueDocID)
		if err != nil {
			return err
		}
		return tx.Model(&entity.Knowledgebase{}).Where("id = ?", lockedKB.ID).Updates(datasetIndexTaskIDUpdate(indexType, task.ID)).Error
	})
	if err != nil {
		if dataErr != nil {
			return nil, common.CodeDataError, dataErr
		}
		common.Warn("Failed to create dataset index task", zap.String("dataset_id", datasetID), zap.String("task_type", taskType), zap.Error(err))
		return nil, common.CodeDataError, errors.New("Internal server error")
	}

	if err := enqueueDatasetIndexTask(0, queueMessage); err != nil {
		if cleanupErr := cleanupFailedDatasetIndexTask(task.ID, updatedDocument, kb.ID, indexType); cleanupErr != nil {
			err = errors.Join(err, cleanupErr)
		}
		common.Warn("Failed to queue dataset index task", zap.String("dataset_id", datasetID), zap.String("task_type", taskType), zap.Error(err))
		return nil, common.CodeDataError, errors.New("Internal server error")
	}

	return map[string]interface{}{"task_id": task.ID}, common.CodeSuccess, nil
}

func (s *DatasetService) getDocumentsByDatasetForIndex(datasetID string) ([]*entity.Document, common.ErrorCode, error) {
	documents, _, err := s.documentDAO.GetByKBID(datasetID)
	if err != nil {
		common.Warn("Failed to load dataset documents for index", zap.String("dataset_id", datasetID), zap.Error(err))
		return nil, common.CodeDataError, errors.New("Internal server error")
	}
	if len(documents) == 0 {
		return nil, common.CodeDataError, fmt.Errorf("No documents in Dataset %s", datasetID)
	}
	return documents, common.CodeSuccess, nil
}

type TraceIndexRequest struct {
	Type string `json:"type" binding:"required"`
}

// TraceIndex Trace an indexing task (graph/raptor/mindmap) for a dataset.
func (s *DatasetService) TraceIndex(datasetID, userID, indexType string) (*entity.Task, common.ErrorCode, error) {
	if !checkType(indexType) {
		return nil, common.CodeDataError, fmt.Errorf("Invalid index type '%s'. Must be one of %v", indexType, validIndexTypes)
	}

	if datasetID == "" {
		return nil, common.CodeDataError, errors.New(`Lack of "Dataset ID"`)
	}
	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
		}
		return nil, common.CodeDataError, errors.New("Internal server error")
	}

	taskID := datasetIndexTaskID(kb, indexType)

	var task *entity.Task
	if taskID != "" {
		task, err = s.taskDAO.GetByID(taskID)
		if err != nil {
			if dao.IsNotFoundErr(err) {
				return nil, common.CodeSuccess, nil
			}
			return nil, common.CodeServerError, errors.New("Internal server error")
		}
		if task == nil {
			return nil, common.CodeSuccess, nil
		}
	}

	return task, common.CodeSuccess, nil
}

type CheckEmbeddingRequest struct {
	EmbeddingID string `json:"embd_id" binding:"required"`
	CheckNum    *int   `json:"check_num,omitempty"`
}

type EmbeddingCheckSummary struct {
	KbID      string  `json:"kb_id"`
	Model     string  `json:"model"`
	Sampled   int     `json:"sampled"`
	Valid     int     `json:"valid"`
	AvgCosSim float64 `json:"avg_cos_sim"`
	MinCosSim float64 `json:"min_cos_sim"`
	MaxCosSim float64 `json:"max_cos_sim"`
	MatchMode string  `json:"match_mode"`
}

type EmbeddingCheckResult struct {
	ChunkID     string  `json:"chunk_id"`
	DocID       string  `json:"doc_id,omitempty"`
	DocName     string  `json:"doc_name,omitempty"`
	VectorField string  `json:"vector_field,omitempty"`
	VectorDim   int     `json:"vector_dim,omitempty"`
	CosSim      float64 `json:"cos_sim,omitempty"`
	Reason      string  `json:"reason,omitempty"`
}

type EmbeddingCheckResponse struct {
	Summary EmbeddingCheckSummary  `json:"summary"`
	Results []EmbeddingCheckResult `json:"results"`
}

type embeddingCheckSample struct {
	ChunkID           string
	KbID              string
	DocID             string
	DocName           string
	VectorField       string
	Vector            []float64
	PageNum           interface{}
	Position          interface{}
	Top               interface{}
	ContentWithWeight string
	QuestionKeywords  []string
}

type datasetParsePageRange struct {
	from int64
	to   int64
}

// RunEmbedding runs embedding for all documents in a dataset.
func (s *DatasetService) RunEmbedding(userID, datasetID string) (map[string]interface{}, common.ErrorCode, error) {
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New(`Lack of "Dataset ID"`)
	}
	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
		}
		return nil, common.CodeServerError, errors.New("Internal server error")
	}

	documents, _, err := s.documentDAO.GetByKBID(datasetID)
	if err != nil {
		return nil, common.CodeServerError, errors.New("Internal server error")
	}
	if len(documents) == 0 {
		return nil, common.CodeDataError, fmt.Errorf("No documents in Dataset %s", datasetID)
	}

	tableDoneCountByKB := make(map[string]int64)
	scheduledCount := 0
	for _, doc := range documents {
		if doc == nil {
			continue
		}
		if err := s.runEmbeddingDocument(kb, doc, tableDoneCountByKB); err != nil {
			common.Warn("Failed to schedule dataset embedding document",
				zap.String("datasetID", datasetID),
				zap.String("docID", doc.ID),
				zap.Error(err))
			return nil, common.CodeServerError, errors.New("Internal server error")
		}
		scheduledCount++
	}

	return map[string]interface{}{
		"scheduled_count": scheduledCount,
	}, common.CodeSuccess, nil
}

func (s *DatasetService) runEmbeddingDocument(kb *entity.Knowledgebase, doc *entity.Document, tableDoneCountByKB map[string]int64) error {
	if doc.PipelineID != nil && strings.TrimSpace(*doc.PipelineID) != "" {
		return s.queueDatasetDataflowTask(kb, doc, strings.TrimSpace(*doc.PipelineID), 0)
	}

	if doc.ParserID == string(entity.ParserTypeTable) {
		doneCount, ok := tableDoneCountByKB[doc.KbID]
		if !ok {
			count, err := s.countDoneDocuments(doc.KbID)
			if err != nil {
				return err
			}
			doneCount = count
			tableDoneCountByKB[doc.KbID] = doneCount
			if doneCount <= 0 {
				if err := s.kbDAO.DeleteFieldMap(doc.KbID); err != nil && !dao.IsNotFoundErr(err) {
					return err
				}
			}
		}
	}

	indexName := fmt.Sprintf("ragflow_%s", kb.TenantID)
	if s.docEngine != nil {
		if _, err := s.docEngine.DeleteChunks(context.Background(), map[string]interface{}{"doc_id": doc.ID}, indexName, doc.KbID); err != nil {
			return err
		}
	}
	if _, err := s.taskDAO.DeleteByDocIDs([]string{doc.ID}); err != nil {
		return err
	}

	bucket, objectName, err := NewDocumentService().GetDocumentStorageAddress(doc)
	if err != nil {
		return err
	}
	if err := s.queueDatasetParseTasks(doc, bucket, objectName, 0); err != nil {
		return err
	}
	if err := s.beginDatasetParseDocument(doc.ID); err != nil {
		if _, delErr := s.taskDAO.DeleteByDocIDs([]string{doc.ID}); delErr != nil {
			common.Warn("Failed to clean parse tasks after document state update failure",
				zap.String("docID", doc.ID),
				zap.Error(delErr))
		}
		return err
	}
	return nil
}

func (s *DatasetService) queueDatasetDataflowTask(kb *entity.Knowledgebase, doc *entity.Document, flowID string, priority int64) error {
	if _, err := s.taskDAO.DeleteByDocIDs([]string{doc.ID}); err != nil {
		return err
	}
	if err := s.beginDatasetParseDocument(doc.ID); err != nil {
		return err
	}

	now := time.Now()
	task := &entity.Task{
		ID:       common.GenerateUUID(),
		DocID:    doc.ID,
		FromPage: 0,
		ToPage:   maximumTaskPageNumber,
		TaskType: "dataflow",
		Priority: priority,
		BeginAt:  &now,
		Progress: 0,
	}
	if err := s.taskDAO.CreateMany([]*entity.Task{task}); err != nil {
		return err
	}

	message := datasetParseTaskMessage(task)
	message["task_type"] = task.TaskType
	message["kb_id"] = doc.KbID
	message["tenant_id"] = kb.TenantID
	message["dataflow_id"] = flowID
	message["file"] = nil
	if redisClient := redisengine.Get(); redisClient == nil || !redisClient.QueueProduct(datasetParseQueueName(doc, priority), message) {
		return fmt.Errorf("Can't access Redis. Please check the Redis' status.")
	}
	return nil
}

func (s *DatasetService) countDoneDocuments(datasetID string) (int64, error) {
	var count int64
	err := dao.GetDB().Model(&entity.Document{}).
		Where("kb_id = ? AND run = ?", datasetID, string(entity.TaskStatusDone)).
		Count(&count).Error
	return count, err
}

func (s *DatasetService) queueDatasetParseTasks(doc *entity.Document, bucket, objectName string, priority int64) error {
	tasks, err := s.buildDatasetParseTasks(doc, bucket, objectName, priority)
	if err != nil {
		return err
	}
	if len(tasks) == 0 {
		return nil
	}
	if err := s.taskDAO.CreateMany(tasks); err != nil {
		return err
	}
	queueName := datasetParseQueueName(doc, priority)
	for _, task := range tasks {
		if task.Progress >= 1 {
			continue
		}
		if redisClient := redisengine.Get(); redisClient == nil || !redisClient.QueueProduct(queueName, datasetParseTaskMessage(task)) {
			if _, delErr := s.taskDAO.DeleteByDocIDs([]string{doc.ID}); delErr != nil {
				common.Warn("Failed to clean parse tasks after Redis enqueue failure",
					zap.String("docID", doc.ID),
					zap.Error(delErr))
			}
			return fmt.Errorf("Can't access Redis. Please check the Redis' status.")
		}
	}
	return nil
}

func (s *DatasetService) buildDatasetParseTasks(doc *entity.Document, bucket, objectName string, priority int64) ([]*entity.Task, error) {
	ranges, err := datasetParseTaskRanges(doc, bucket, objectName)
	if err != nil {
		return nil, err
	}
	now := time.Now()
	tasks := make([]*entity.Task, 0, len(ranges))
	for _, pageRange := range ranges {
		progressMsg := ""
		digest := datasetParseTaskDigest(doc, pageRange.from, pageRange.to)
		chunkIDs := ""
		tasks = append(tasks, &entity.Task{
			ID:          common.GenerateUUID(),
			DocID:       doc.ID,
			FromPage:    pageRange.from,
			ToPage:      pageRange.to,
			TaskType:    "",
			Priority:    priority,
			BeginAt:     &now,
			Progress:    0,
			ProgressMsg: &progressMsg,
			Digest:      &digest,
			ChunkIDs:    &chunkIDs,
		})
	}
	return tasks, nil
}

func (s *DatasetService) beginDatasetParseDocument(docID string) error {
	now := time.Now()
	return dao.GetDB().Model(&entity.Document{}).Where("id = ?", docID).Updates(map[string]interface{}{
		"progress_msg":     "Task is queued...",
		"process_begin_at": now,
		"progress":         rand.Float64() * 0.01,
		"run":              string(entity.TaskStatusRunning),
		"chunk_num":        0,
		"token_num":        0,
	}).Error
}

// CheckEmbedding checks whether a new embedding model is compatible with stored vectors.
func (s *DatasetService) CheckEmbedding(userID, datasetID string, req *CheckEmbeddingRequest) (*EmbeddingCheckResponse, common.ErrorCode, error) {
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New(`Lack of "Dataset ID"`)
	}
	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
		}
		return nil, common.CodeServerError, errors.New("Internal server error")
	}

	if req == nil || strings.TrimSpace(req.EmbeddingID) == "" {
		return nil, common.CodeDataError, errors.New("`embd_id` is required.")
	}
	embeddingID := strings.TrimSpace(req.EmbeddingID)
	if ok, message := s.verifyEmbeddingAvailability(embeddingID, userID); !ok {
		return nil, common.CodeDataError, errors.New(message)
	}
	if s.docEngine == nil {
		return nil, common.CodeServerError, errors.New("doc engine not initialized")
	}

	driver, modelName, apiConfig, maxTokens, err := NewModelProviderService().GetModelConfigFromProviderInstance(kb.TenantID, entity.ModelTypeEmbedding, embeddingID)
	if err != nil {
		return nil, common.CodeDataError, err
	}
	embeddingModel := models.NewEmbeddingModel(driver, &modelName, apiConfig, maxTokens)

	checkNum := defaultEmbeddingCheckNum
	if req.CheckNum != nil {
		checkNum = *req.CheckNum
	}
	if checkNum <= 0 {
		checkNum = defaultEmbeddingCheckNum
	}

	samples, err := s.sampleRandomChunksWithVectors(context.Background(), kb.TenantID, datasetID, checkNum)
	if err != nil {
		return nil, common.CodeServerError, err
	}

	results := make([]EmbeddingCheckResult, 0, len(samples))
	effectiveSimilarities := make([]float64, 0, len(samples))
	matchMode := "content_only"
	for _, sample := range samples {
		title := sample.DocName
		if strings.TrimSpace(title) == "" {
			title = "Title"
		}

		textInput := strings.Join(sample.QuestionKeywords, "\n")
		if strings.TrimSpace(textInput) == "" {
			textInput = sample.ContentWithWeight
		}
		textInput = datasetCleanEmbeddingText(textInput)
		if textInput == "" {
			results = append(results, EmbeddingCheckResult{ChunkID: sample.ChunkID, Reason: "no_text"})
			continue
		}
		if len(sample.Vector) == 0 {
			results = append(results, EmbeddingCheckResult{ChunkID: sample.ChunkID, Reason: "no_stored_vector"})
			continue
		}

		vectors, err := datasetEncodeEmbedding(embeddingModel, []string{title, textInput})
		if err != nil {
			return nil, common.CodeDataError, fmt.Errorf("Embedding failure. %w", err)
		}
		if len(vectors) < 2 {
			return nil, common.CodeDataError, errors.New("Embedding failure. embedding response is incomplete")
		}
		if len(vectors[1]) != len(sample.Vector) {
			return nil, common.CodeDataError, fmt.Errorf("Embedding failure. The dimension (%d) of given embedding model is different from the original (%d)", len(vectors[1]), len(sample.Vector))
		}

		simContent := datasetCosSim(vectors[1], sample.Vector)
		simMix := datasetCosSim(datasetMixVectors(vectors[0], vectors[1], 0.1), sample.Vector)
		sim := simContent
		matchMode = "content_only"
		if simMix > sim {
			sim = simMix
			matchMode = "title+content"
		}
		sim = datasetRoundFloat(sim, 6)

		effectiveSimilarities = append(effectiveSimilarities, sim)
		results = append(results, EmbeddingCheckResult{
			ChunkID:     sample.ChunkID,
			DocID:       sample.DocID,
			DocName:     sample.DocName,
			VectorField: sample.VectorField,
			VectorDim:   len(sample.Vector),
			CosSim:      sim,
		})
	}

	summary := datasetEmbeddingCheckSummary(datasetID, embeddingID, len(samples), effectiveSimilarities, matchMode)
	response := &EmbeddingCheckResponse{Summary: summary, Results: results}
	if len(effectiveSimilarities) == 0 {
		return nil, common.CodeDataError, errors.New("No embedded chunks are available to compare.")
	}
	if summary.AvgCosSim >= 0.9 {
		return response, common.CodeSuccess, nil
	}
	return response, common.CodeNotEffective, errors.New("Embedding model switch failed: the average similarity between old and new vectors is below 0.9, indicating incompatible vector spaces.")
}

func (s *DatasetService) sampleRandomChunksWithVectors(ctx context.Context, tenantID, datasetID string, n int) ([]embeddingCheckSample, error) {
	indexName := fmt.Sprintf("ragflow_%s", tenantID)
	totalResult, err := s.docEngine.Search(ctx, &enginetypes.SearchRequest{
		IndexNames: []string{indexName},
		KbIDs:      []string{datasetID},
		Offset:     0,
		Limit:      1,
		Filter: map[string]interface{}{
			"kb_id":         datasetID,
			"available_int": 1,
		},
	})
	if err != nil {
		return nil, err
	}
	if totalResult == nil || totalResult.Total <= 0 {
		return []embeddingCheckSample{}, nil
	}

	total := int(totalResult.Total)
	// Cap n to a sane upper bound so a hostile caller can't force a
	// huge preallocation. The downstream `samples` slice is sized
	// directly from n.
	const maxEmbeddingSamples = 1024
	if n < 0 {
		return nil, fmt.Errorf("invalid sample size: %d", n)
	}
	if n > maxEmbeddingSamples {
		n = maxEmbeddingSamples
	}
	if n > total {
		n = total
	}
	limit := total
	if limit > 1000 {
		limit = 1000
	}
	if n > limit {
		n = limit
	}
	offsets := rand.Perm(limit)
	offsets = offsets[:n]
	sort.Ints(offsets)

	baseFields := []string{"docnm_kwd", "doc_id", "content_with_weight", "page_num_int", "position_int", "top_int"}
	// codeql[go/uncontrolled-allocation-size] False positive: n is
	// bounded to maxEmbeddingSamples (1024) at the top of this
	// function, so the samples slice cannot exceed ~1 MiB
	// (embeddingCheckSample is a small struct).
	samples := make([]embeddingCheckSample, 0, n)
	for _, offset := range offsets {
		searchResult, err := s.docEngine.Search(ctx, &enginetypes.SearchRequest{
			IndexNames:   []string{indexName},
			KbIDs:        []string{datasetID},
			Offset:       offset,
			Limit:        1,
			SelectFields: baseFields,
			Filter: map[string]interface{}{
				"kb_id":         datasetID,
				"available_int": 1,
			},
		})
		if err != nil {
			return nil, err
		}
		if searchResult == nil || len(searchResult.Chunks) == 0 {
			continue
		}
		chunkID := datasetChunkID(searchResult.Chunks[0])
		if chunkID == "" {
			continue
		}
		fullChunk, err := s.docEngine.GetChunk(ctx, indexName, chunkID, []string{datasetID})
		if err != nil {
			return nil, err
		}
		chunkMap := datasetMap(fullChunk)
		if len(chunkMap) == 0 {
			continue
		}
		vectorField := datasetGuessVecField(chunkMap)
		vector := datasetAsFloatVec(chunkMap[vectorField])
		samples = append(samples, embeddingCheckSample{
			ChunkID:           chunkID,
			KbID:              datasetID,
			DocID:             datasetString(chunkMap["doc_id"]),
			DocName:           datasetString(chunkMap["docnm_kwd"]),
			VectorField:       vectorField,
			Vector:            vector,
			PageNum:           chunkMap["page_num_int"],
			Position:          chunkMap["position_int"],
			Top:               chunkMap["top_int"],
			ContentWithWeight: datasetString(chunkMap["content_with_weight"]),
			QuestionKeywords:  datasetStringSlice(chunkMap["question_kwd"]),
		})
	}
	return samples, nil
}

func datasetGuessVecField(src map[string]interface{}) string {
	for k := range src {
		if strings.HasSuffix(k, "_vec") {
			return k
		}
	}
	return ""
}

func datasetAsFloatVec(v interface{}) []float64 {
	if v == nil {
		return []float64{}
	}
	switch val := v.(type) {
	case string:
		parts := strings.Split(val, "\t")
		res := make([]float64, 0, len(parts))
		for _, p := range parts {
			if p == "" {
				continue
			}
			f, err := strconv.ParseFloat(p, 64)
			if err != nil {
				continue
			}
			res = append(res, f)
		}
		return res
	case []float64:
		return val
	case []float32:
		res := make([]float64, len(val))
		for i, x := range val {
			res[i] = float64(x)
		}
		return res
	case []int:
		res := make([]float64, len(val))
		for i, x := range val {
			res[i] = float64(x)
		}
		return res
	case []interface{}:
		res := make([]float64, 0, len(val))
		for _, x := range val {
			switch n := x.(type) {
			case float64:
				res = append(res, n)
			case float32:
				res = append(res, float64(n))
			case int:
				res = append(res, float64(n))
			case string:
				f, err := strconv.ParseFloat(n, 64)
				if err == nil {
					res = append(res, f)
				}
			}
		}
		return res
	}
	return []float64{}
}

func datasetCosSim(a, b []float64) float64 {
	if len(a) == 0 || len(b) == 0 {
		return 0
	}
	var dot, na, nb float64
	n := len(a)
	if len(b) < n {
		n = len(b)
	}
	for i := 0; i < n; i++ {
		dot += a[i] * b[i]
	}
	for _, x := range a {
		na += x * x
	}
	for _, x := range b {
		nb += x * x
	}

	if na == 0 || nb == 0 {
		return 0
	}
	return dot / (math.Sqrt(na) * math.Sqrt(nb))
}

func datasetCleanEmbeddingText(s string) string {
	re := regexp.MustCompile(`</?(table|td|caption|tr|th)( [^<>]{0,12})?>`)
	return strings.TrimSpace(re.ReplaceAllString(s, " "))
}

func datasetEncodeEmbedding(embeddingModel *models.EmbeddingModel, texts []string) ([][]float64, error) {
	embeddingConfig := &models.EmbeddingConfig{Dimension: 0}
	embeddings, err := embeddingModel.ModelDriver.Embed(embeddingModel.ModelName, texts, embeddingModel.APIConfig, embeddingConfig)
	if err != nil {
		return nil, err
	}
	vectors := make([][]float64, len(embeddings))
	for i, embedding := range embeddings {
		vectors[i] = embedding.Embedding
	}
	return vectors, nil
}

func datasetMixVectors(titleVector, contentVector []float64, titleWeight float64) []float64 {
	if len(titleVector) != len(contentVector) {
		return contentVector
	}
	mixed := make([]float64, len(contentVector))
	contentWeight := 1 - titleWeight
	for i := range contentVector {
		mixed[i] = titleWeight*titleVector[i] + contentWeight*contentVector[i]
	}
	return mixed
}

func datasetEmbeddingCheckSummary(datasetID, embeddingID string, sampled int, similarities []float64, matchMode string) EmbeddingCheckSummary {
	summary := EmbeddingCheckSummary{
		KbID:      datasetID,
		Model:     embeddingID,
		Sampled:   sampled,
		Valid:     len(similarities),
		MatchMode: matchMode,
	}
	if len(similarities) == 0 {
		return summary
	}
	minValue := similarities[0]
	maxValue := similarities[0]
	total := 0.0
	for _, value := range similarities {
		total += value
		if value < minValue {
			minValue = value
		}
		if value > maxValue {
			maxValue = value
		}
	}
	summary.AvgCosSim = datasetRoundFloat(total/float64(len(similarities)), 6)
	summary.MinCosSim = datasetRoundFloat(minValue, 6)
	summary.MaxCosSim = datasetRoundFloat(maxValue, 6)
	return summary
}

func datasetRoundFloat(value float64, places int) float64 {
	factor := math.Pow10(places)
	return math.Round(value*factor) / factor
}

func datasetChunkID(chunk map[string]interface{}) string {
	for _, key := range []string{"id", "_id"} {
		if value := datasetString(chunk[key]); value != "" {
			return value
		}
	}
	return ""
}

func datasetMap(value interface{}) map[string]interface{} {
	switch typedValue := value.(type) {
	case map[string]interface{}:
		return typedValue
	default:
		return map[string]interface{}{}
	}
}

func datasetString(value interface{}) string {
	switch typedValue := value.(type) {
	case string:
		return typedValue
	case fmt.Stringer:
		return typedValue.String()
	case nil:
		return ""
	default:
		return fmt.Sprint(typedValue)
	}
}

func datasetStringSlice(value interface{}) []string {
	switch typedValue := value.(type) {
	case []string:
		return typedValue
	case []interface{}:
		values := make([]string, 0, len(typedValue))
		for _, item := range typedValue {
			if s := strings.TrimSpace(datasetString(item)); s != "" {
				values = append(values, s)
			}
		}
		return values
	case string:
		if typedValue == "" {
			return nil
		}
		return []string{typedValue}
	default:
		return nil
	}
}

func datasetParseQueueName(doc *entity.Document, priority int64) string {
	suffix := "common"
	if doc.ParserID == string(entity.ParserTypeResume) {
		suffix = "resume"
	}
	return fmt.Sprintf("%s.%d.%s", serverQueueNamePrefix, priority, suffix)
}

func datasetParseTaskMessage(task *entity.Task) map[string]interface{} {
	beginAt := ""
	if task.BeginAt != nil {
		beginAt = task.BeginAt.Format("2006-01-02 15:04:05")
	}
	digest := ""
	if task.Digest != nil {
		digest = *task.Digest
	}
	return map[string]interface{}{
		"id":        task.ID,
		"doc_id":    task.DocID,
		"from_page": task.FromPage,
		"to_page":   task.ToPage,
		"progress":  task.Progress,
		"priority":  task.Priority,
		"begin_at":  beginAt,
		"digest":    digest,
	}
}

func datasetParseTaskDigest(doc *entity.Document, fromPage, toPage int64) string {
	hasher := xxhash.New()
	config := datasetChunkingConfigForDigest(doc)
	keys := make([]string, 0, len(config))
	for key := range config {
		keys = append(keys, key)
	}
	sort.Strings(keys)
	for _, key := range keys {
		hasher.WriteString(datasetStableString(config[key]))
	}
	hasher.WriteString(doc.ID)
	hasher.WriteString(strconv.FormatInt(fromPage, 10))
	hasher.WriteString(strconv.FormatInt(toPage, 10))
	return fmt.Sprintf("%x", hasher.Sum64())
}

func datasetChunkingConfigForDigest(doc *entity.Document) map[string]interface{} {
	return map[string]interface{}{
		"doc_id":        doc.ID,
		"kb_id":         doc.KbID,
		"parser_id":     doc.ParserID,
		"parser_config": datasetCopyParserConfigForDigest(doc.ParserConfig),
	}
}

func datasetCopyParserConfigForDigest(config map[string]interface{}) map[string]interface{} {
	copied := make(map[string]interface{}, len(config))
	for key, value := range config {
		if key == "raptor" || key == "graphrag" {
			continue
		}
		copied[key] = value
	}
	return copied
}

func datasetStableString(value interface{}) string {
	binary, err := json.Marshal(value)
	if err != nil {
		return fmt.Sprint(value)
	}
	return string(binary)
}

func datasetParseTaskRanges(doc *entity.Document, bucket, objectName string) ([]datasetParsePageRange, error) {
	if doc.Type == "pdf" {
		return datasetPDFParseTaskRanges(doc, bucket, objectName)
	}
	if doc.ParserID == string(entity.ParserTypeTable) {
		return datasetTableParseTaskRanges(doc, bucket, objectName)
	}
	return []datasetParsePageRange{{from: 0, to: maximumTaskPageNumber}}, nil
}

func datasetPDFParseTaskRanges(doc *entity.Document, bucket, objectName string) ([]datasetParsePageRange, error) {
	binary, err := datasetStorageBinary(bucket, objectName)
	if err != nil {
		return nil, err
	}
	pages := datasetEstimatePDFPageCount(binary)
	pageSize := int64(datasetParserConfigInt(doc.ParserConfig, "task_page_size", 12))
	if doc.ParserID == string(entity.ParserTypePaper) {
		pageSize = int64(datasetParserConfigInt(doc.ParserConfig, "task_page_size", 22))
	}
	if doc.ParserID == string(entity.ParserTypeOne) ||
		doc.ParserID == string(entity.ParserTypeKG) ||
		datasetParserConfigString(doc.ParserConfig, "layout_recognize", "DeepDOC") != "DeepDOC" ||
		datasetParserConfigBool(doc.ParserConfig, "toc_extraction", false) {
		pageSize = maximumTaskPageNumber
	}
	if pageSize <= 0 {
		pageSize = 12
	}

	pageRanges := datasetParserConfigPageRanges(doc.ParserConfig)
	ranges := make([]datasetParsePageRange, 0)
	for _, configuredRange := range pageRanges {
		start := configuredRange.from - 1
		if start < 0 {
			start = 0
		}
		end := configuredRange.to - 1
		if pages >= 0 && end > pages {
			end = pages
		}
		for page := start; page < end; page += pageSize {
			to := page + pageSize
			if to > end {
				to = end
			}
			ranges = append(ranges, datasetParsePageRange{from: page, to: to})
		}
	}
	if len(ranges) == 0 {
		ranges = append(ranges, datasetParsePageRange{from: 0, to: maximumTaskPageNumber})
	}
	return ranges, nil
}

func datasetTableParseTaskRanges(doc *entity.Document, bucket, objectName string) ([]datasetParsePageRange, error) {
	binary, err := datasetStorageBinary(bucket, objectName)
	if err != nil {
		return nil, err
	}
	rows := datasetEstimateTableRowCount(datasetDocName(doc), binary)
	if rows <= 0 {
		return []datasetParsePageRange{{from: 0, to: maximumTaskPageNumber}}, nil
	}
	ranges := make([]datasetParsePageRange, 0, (rows+2999)/3000)
	for row := int64(0); row < int64(rows); row += 3000 {
		to := row + 3000
		if to > int64(rows) {
			to = int64(rows)
		}
		ranges = append(ranges, datasetParsePageRange{from: row, to: to})
	}
	return ranges, nil
}

func datasetStorageBinary(bucket, objectName string) ([]byte, error) {
	storageImpl := storage.GetStorageFactory().GetStorage()
	if storageImpl == nil {
		return nil, fmt.Errorf("storage not initialized")
	}
	return storageImpl.Get(bucket, objectName)
}

func datasetDocName(doc *entity.Document) string {
	if doc == nil || doc.Name == nil {
		return ""
	}
	return *doc.Name
}

func datasetParserConfigInt(config map[string]interface{}, key string, fallback int) int {
	value, ok := config[key]
	if !ok || value == nil {
		return fallback
	}
	switch typedValue := value.(type) {
	case int:
		return typedValue
	case int64:
		return int(typedValue)
	case float64:
		return int(typedValue)
	case json.Number:
		if intValue, err := typedValue.Int64(); err == nil {
			return int(intValue)
		}
	case string:
		if intValue, err := strconv.Atoi(strings.TrimSpace(typedValue)); err == nil {
			return intValue
		}
	}
	return fallback
}

func datasetParserConfigString(config map[string]interface{}, key, fallback string) string {
	value, ok := config[key]
	if !ok || value == nil {
		return fallback
	}
	if stringValue, ok := value.(string); ok {
		return stringValue
	}
	return fmt.Sprint(value)
}

func datasetParserConfigBool(config map[string]interface{}, key string, fallback bool) bool {
	value, ok := config[key]
	if !ok || value == nil {
		return fallback
	}
	switch typedValue := value.(type) {
	case bool:
		return typedValue
	case string:
		switch strings.ToLower(strings.TrimSpace(typedValue)) {
		case "true", "1", "yes", "on":
			return true
		case "false", "0", "no", "off":
			return false
		}
	}
	return fallback
}

func datasetParserConfigPageRanges(config map[string]interface{}) []datasetParsePageRange {
	defaultRanges := []datasetParsePageRange{{from: 1, to: maximumPageNumber}}
	raw, ok := config["pages"]
	if !ok || raw == nil {
		return defaultRanges
	}
	rawRanges, ok := raw.([]interface{})
	if !ok || len(rawRanges) == 0 {
		return defaultRanges
	}

	ranges := make([]datasetParsePageRange, 0, len(rawRanges))
	for _, rawRange := range rawRanges {
		rangeValues, ok := rawRange.([]interface{})
		if !ok || len(rangeValues) < 2 {
			continue
		}
		from, okFrom := datasetToInt64(rangeValues[0])
		to, okTo := datasetToInt64(rangeValues[1])
		if okFrom && okTo && to > from {
			ranges = append(ranges, datasetParsePageRange{from: from, to: to})
		}
	}
	if len(ranges) == 0 {
		return defaultRanges
	}
	return ranges
}

func datasetToInt64(value interface{}) (int64, bool) {
	switch typedValue := value.(type) {
	case int:
		return int64(typedValue), true
	case int64:
		return typedValue, true
	case float64:
		return int64(typedValue), true
	case json.Number:
		intValue, err := typedValue.Int64()
		return intValue, err == nil
	case string:
		intValue, err := strconv.ParseInt(strings.TrimSpace(typedValue), 10, 64)
		return intValue, err == nil
	default:
		return 0, false
	}
}

var datasetPDFPagePattern = regexp.MustCompile(`/Type\s*/Page\b`)

func datasetEstimatePDFPageCount(binary []byte) int64 {
	if len(binary) == 0 {
		return 0
	}
	return int64(len(datasetPDFPagePattern.FindAll(binary, -1)))
}

func datasetEstimateTableRowCount(name string, binary []byte) int {
	switch strings.ToLower(filepath.Ext(name)) {
	case ".xlsx":
		if rows, err := datasetCountXLSXRows(binary); err == nil {
			return rows
		}
	case ".csv", ".tsv", ".txt":
		return datasetCountDelimitedRows(name, binary)
	}
	return 0
}

func datasetCountDelimitedRows(name string, binary []byte) int {
	reader := csv.NewReader(bytes.NewReader(binary))
	reader.FieldsPerRecord = -1
	reader.ReuseRecord = true
	if strings.EqualFold(filepath.Ext(name), ".tsv") {
		reader.Comma = '\t'
	}
	rows := 0
	for {
		_, err := reader.Read()
		if err == nil {
			rows++
			continue
		}
		if err == io.EOF {
			break
		}
		rows += bytes.Count(binary, []byte{'\n'})
		if len(binary) > 0 && binary[len(binary)-1] != '\n' {
			rows++
		}
		break
	}
	return rows
}

func datasetCountXLSXRows(binary []byte) (int, error) {
	zipReader, err := zip.NewReader(bytes.NewReader(binary), int64(len(binary)))
	if err != nil {
		return 0, err
	}
	maxRows := 0
	for _, file := range zipReader.File {
		if !strings.HasPrefix(file.Name, "xl/worksheets/") || !strings.HasSuffix(file.Name, ".xml") {
			continue
		}
		rows, err := datasetCountWorksheetRows(file)
		if err != nil {
			return 0, err
		}
		if rows > maxRows {
			maxRows = rows
		}
	}
	return maxRows, nil
}

func datasetCountWorksheetRows(file *zip.File) (int, error) {
	reader, err := file.Open()
	if err != nil {
		return 0, err
	}
	defer reader.Close()

	decoder := xml.NewDecoder(reader)
	rows := 0
	for {
		token, err := decoder.Token()
		if err == io.EOF {
			break
		}
		if err != nil {
			return 0, err
		}
		start, ok := token.(xml.StartElement)
		if ok && start.Name.Local == "row" {
			rows++
		}
	}
	return rows, nil
}

func (s *DatasetService) DeleteIndex(userID, datasetID, indexType string, wipe bool) (common.ErrorCode, error) {
	if !checkType(indexType) {
		return common.CodeArgumentError, fmt.Errorf("Invalid index type '%s'", indexType)
	}

	if datasetID == "" {
		return common.CodeDataError, errors.New(`Lack of "Dataset ID"`)
	}

	if !s.kbDAO.Accessible(datasetID, userID) {
		return common.CodeDataError, errors.New("No authorization.")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return common.CodeDataError, errors.New("Invalid Dataset ID")
		}
		return common.CodeDataError, errors.New("Internal server error")
	}

	taskIDField := datasetIndexTaskIDColumn(indexType)
	taskFinishAtField := datasetIndexTaskFinishAtColumn(indexType)
	taskID := datasetIndexTaskID(kb, indexType)

	common.Info("delete_index", zap.String("dataset_id", datasetID), zap.String("index_type", indexType), zap.Bool("wipe", wipe))

	if taskID != "" {
		redisClient := redisengine.Get()
		if redisClient == nil || !redisClient.Set(fmt.Sprintf("%s-cancel", taskID), "x", 0) {
			common.Warn("Failed to set dataset index cancellation marker", zap.String("dataset_id", datasetID), zap.String("task_id", taskID))
		}
		if err := dao.DB.Unscoped().Where("id = ?", taskID).Delete(&entity.Task{}).Error; err != nil {
			common.Warn("Failed to delete dataset index task", zap.String("dataset_id", datasetID), zap.String("task_id", taskID), zap.Error(err))
			return common.CodeDataError, errors.New("Internal server error")
		}
	}

	if wipe && indexType == "graph" {
		if s.docEngine == nil {
			return common.CodeServerError, errors.New("Document engine is not initialized")
		}
		indexName := fmt.Sprintf("ragflow_%s", kb.TenantID)
		_, err = s.docEngine.DeleteChunks(context.Background(), map[string]interface{}{
			"knowledge_graph_kwd": interfaceSlice("graph", "subgraph", "entity", "relation", "community_report"),
			"kb_id":               datasetID,
		}, indexName, datasetID)
		if err != nil {
			common.Warn("Failed to delete GraphRAG artefacts", zap.String("dataset_id", datasetID), zap.Error(err))
			return common.CodeDataError, errors.New("Internal server error")
		}
		clearGraphPhaseMarkers(redisengine.Get(), datasetID)
		common.Info("delete_index: cleared GraphRAG artefacts and phase markers", zap.String("dataset_id", datasetID))
	} else if wipe && indexType == "raptor" {
		if s.docEngine == nil {
			return common.CodeServerError, errors.New("Document engine is not initialized")
		}
		indexName := fmt.Sprintf("ragflow_%s", kb.TenantID)
		_, err = s.docEngine.DeleteChunks(context.Background(), map[string]interface{}{
			"raptor_kwd": interfaceSlice("raptor"),
			"kb_id":      datasetID,
		}, indexName, datasetID)
		if err != nil {
			common.Warn("Failed to delete RAPTOR artefacts", zap.String("dataset_id", datasetID), zap.Error(err))
			return common.CodeDataError, errors.New("Internal server error")
		}
	}

	if err := dao.DB.Model(&entity.Knowledgebase{}).Where("id = ?", kb.ID).Updates(map[string]interface{}{
		taskIDField:       "",
		taskFinishAtField: nil,
	}).Error; err != nil {
		common.Warn("Failed to clear dataset index task fields", zap.String("dataset_id", datasetID), zap.String("index_type", indexType), zap.Error(err))
		return common.CodeDataError, errors.New("Internal server error")
	}

	return common.CodeSuccess, nil
}

// SearchDatasetsRequest is the request structure for searching chunks across datasets.
type SearchDatasetsRequest struct {
	DatasetIDs             []string               `json:"dataset_ids" binding:"required"`
	Question               string                 `json:"question" binding:"required"`
	Page                   *int                   `json:"page,omitempty"`
	Size                   *int                   `json:"size,omitempty"`
	DocIDs                 []string               `json:"doc_ids,omitempty"`
	UseKG                  *bool                  `json:"use_kg,omitempty"`
	TopK                   *int                   `json:"top_k,omitempty"`
	CrossLanguages         []string               `json:"cross_languages,omitempty"`
	SearchID               *string                `json:"search_id,omitempty"`
	MetadataFilter         map[string]interface{} `json:"meta_data_filter,omitempty"`
	RerankID               *string                `json:"rerank_id,omitempty"`
	Keyword                *bool                  `json:"keyword,omitempty"`
	SimilarityThreshold    *float64               `json:"similarity_threshold,omitempty"`
	VectorSimilarityWeight *float64               `json:"vector_similarity_weight,omitempty"`
}

// SearchDatasetsResponse is the response structure for dataset search results.
type SearchDatasetsResponse struct {
	Chunks  []map[string]interface{} `json:"chunks"`
	DocAggs []map[string]interface{} `json:"doc_aggs"`
	Labels  *map[string]float64      `json:"labels"`
	Total   int64                    `json:"total"`
}

// SearchDatasetRequest is the request structure for searching chunks within one dataset.
type SearchDatasetRequest struct {
	Question               string                 `json:"question"`
	Page                   *int                   `json:"page,omitempty"`
	Size                   *int                   `json:"size,omitempty"`
	DocIDs                 []string               `json:"doc_ids,omitempty"`
	UseKG                  *bool                  `json:"use_kg,omitempty"`
	TopK                   *int                   `json:"top_k,omitempty"`
	CrossLanguages         []string               `json:"cross_languages,omitempty"`
	SearchID               *string                `json:"search_id,omitempty"`
	MetadataFilter         map[string]interface{} `json:"meta_data_filter,omitempty"`
	RerankID               *string                `json:"rerank_id,omitempty"`
	Keyword                *bool                  `json:"keyword,omitempty"`
	SimilarityThreshold    *float64               `json:"similarity_threshold,omitempty"`
	VectorSimilarityWeight *float64               `json:"vector_similarity_weight,omitempty"`
}

// ToSearchDatasetsRequest converts a single-dataset search request into the multi-dataset form.
func (req *SearchDatasetRequest) ToSearchDatasetsRequest(datasetID string) *SearchDatasetsRequest {
	if req == nil {
		return &SearchDatasetsRequest{DatasetIDs: []string{datasetID}}
	}
	return &SearchDatasetsRequest{
		DatasetIDs:             []string{datasetID},
		Question:               req.Question,
		Page:                   req.Page,
		Size:                   req.Size,
		DocIDs:                 req.DocIDs,
		UseKG:                  req.UseKG,
		TopK:                   req.TopK,
		CrossLanguages:         req.CrossLanguages,
		SearchID:               req.SearchID,
		MetadataFilter:         req.MetadataFilter,
		RerankID:               req.RerankID,
		Keyword:                req.Keyword,
		SimilarityThreshold:    req.SimilarityThreshold,
		VectorSimilarityWeight: req.VectorSimilarityWeight,
	}
}

// SearchDataset searches chunks within one knowledge base based on a question.
func (s *DatasetService) SearchDataset(datasetID, userID string, req *SearchDatasetRequest) (*SearchDatasetsResponse, error) {
	if datasetID == "" {
		return nil, fmt.Errorf("dataset_id is required")
	}
	return s.SearchDatasets(req.ToSearchDatasetsRequest(datasetID), userID)
}

// SearchDatasets searches chunks across one or more knowledge bases based on a question.
// It retrieves relevant chunks using embedding and optional reranking, applying filters,
// cross-language translation, and keyword extraction as configured.
func (s *DatasetService) SearchDatasets(req *SearchDatasetsRequest, userID string) (*SearchDatasetsResponse, error) {
	if req.Question == "" {
		return nil, fmt.Errorf("question is required")
	}
	if len(req.DatasetIDs) == 0 {
		return nil, fmt.Errorf("dataset_ids is required")
	}
	common.Info("SearchDatasets started", zap.String("userID", userID), zap.Any("datasets", req.DatasetIDs), zap.String("question", req.Question))

	page := 1
	if req.Page != nil {
		page = *req.Page
	}
	pageSize := 30
	if req.Size != nil {
		pageSize = *req.Size
	}
	useKG := false
	if req.UseKG != nil {
		useKG = *req.UseKG
	}
	similarityThreshold := 0.0
	if req.SimilarityThreshold != nil {
		similarityThreshold = *req.SimilarityThreshold
	}
	vectorSimilarityWeight := 0.3
	if req.VectorSimilarityWeight != nil {
		vectorSimilarityWeight = *req.VectorSimilarityWeight
	}
	topK := 1024
	if req.TopK != nil {
		topK = *req.TopK
	}
	if topK < 1 {
		topK = 1
	} else if topK > 2048 {
		topK = 2048
	}
	keyword := false
	if req.Keyword != nil {
		keyword = *req.Keyword
	}
	searchID := ""
	if req.SearchID != nil {
		searchID = *req.SearchID
	}
	rerankID := ""
	if req.RerankID != nil {
		rerankID = *req.RerankID
	}

	question := req.Question
	datasetIDs := req.DatasetIDs
	metadataFilter := req.MetadataFilter
	crossLanguages := req.CrossLanguages

	common.Debug(fmt.Sprintf("SearchDatasets request:\n"+
		"    datasetIDs=%v\n"+
		"    question=%s\n"+
		"    page=%v, pageSize=%v\n"+
		"    docIDs=%v\n"+
		"    useKG=%v, topK=%v\n"+
		"    crossLanguages=%v\n"+
		"    searchID=%v\n"+
		"    metadataFilter=%v\n"+
		"    rerankID=%v\n"+
		"    keyword=%v\n"+
		"    similarityThreshold=%v, vectorSimilarityWeight=%v",
		datasetIDs, req.Question,
		common.PtrString(req.Page), common.PtrString(req.Size), req.DocIDs,
		useKG, topK, crossLanguages, searchID,
		metadataFilter,
		rerankID,
		keyword,
		similarityThreshold, vectorSimilarityWeight))

	ctx := context.Background()
	modelProviderSvc := NewModelProviderService()

	// Access check for all datasets
	var tenantIDs []string
	var kbRecords []*entity.Knowledgebase
	seenTenants := make(map[string]bool)
	for _, datasetID := range datasetIDs {
		if !s.kbDAO.Accessible(datasetID, userID) {
			common.Warn("SearchDatasets access denied", zap.String("datasetID", datasetID), zap.String("userID", userID))
			return nil, fmt.Errorf("only owner of dataset %s is authorized for this operation", datasetID)
		}

		kb, err := s.kbDAO.GetByID(datasetID)
		if err != nil || kb == nil {
			common.Warn("SearchDatasets dataset not found", zap.String("datasetID", datasetID))
			return nil, fmt.Errorf("dataset %s not found", datasetID)
		}
		if !seenTenants[kb.TenantID] {
			seenTenants[kb.TenantID] = true
			tenantIDs = append(tenantIDs, kb.TenantID)
		}
		kbRecords = append(kbRecords, kb)
	}

	// Check if all kbs have the same embedding model
	if len(kbRecords) > 1 {
		firstEmbdID := kbRecords[0].EmbdID
		for i := 1; i < len(kbRecords); i++ {
			if kbRecords[i].EmbdID != firstEmbdID {
				return nil, fmt.Errorf("Datasets use different embedding models.")
			}
		}
	}

	// Override request fields with values from saved search config (if search_id is provided)
	var chatID string
	if searchID != "" {
		if s.searchService == nil {
			common.Warn("Search service is not initialized for search_id", zap.String("searchID", searchID))
			return nil, fmt.Errorf("Invalid search_id")
		}
		searchDetail, err := s.searchService.GetDetail(searchID)
		if err != nil || searchDetail == nil || len(searchDetail) == 0 {
			common.Warn("Invalid search_id", zap.String("searchID", searchID), zap.Error(err))
			return nil, fmt.Errorf("Invalid search_id")
		} else if searchConfig, ok := searchDetail["search_config"].(map[string]interface{}); ok && searchConfig != nil {
			if scMetadataFilter, ok := searchConfig["meta_data_filter"].(map[string]interface{}); ok {
				metadataFilter = scMetadataFilter
			}
			if scST, ok := searchConfig["similarity_threshold"].(float64); ok {
				similarityThreshold = scST
			}
			if scVSW, ok := searchConfig["vector_similarity_weight"].(float64); ok {
				vectorSimilarityWeight = scVSW
			}
			if scTopK, ok := searchConfig["top_k"].(float64); ok {
				topK = int(scTopK)
				if topK < 1 {
					topK = 1
				} else if topK > 2048 {
					topK = 2048
				}
			}
			if scUseKG, ok := searchConfig["use_kg"].(bool); ok {
				useKG = scUseKG
			}
			if scLangs, ok := searchConfig["cross_languages"].([]interface{}); ok {
				crossLanguages = make([]string, len(scLangs))
				for i, l := range scLangs {
					if s, ok := l.(string); ok {
						crossLanguages[i] = s
					}
				}
			}
			if scKeyword, ok := searchConfig["keyword"].(bool); ok {
				keyword = scKeyword
			}
			if scRerankID, ok := searchConfig["rerank_id"].(string); ok {
				rerankID = scRerankID
			}
			chatID, _ = searchConfig["chat_id"].(string)

			common.Debug("SearchDatasets loaded Search config",
				zap.String("searchID", searchID),
				zap.Strings("datasetIDs", datasetIDs),
				zap.Float64("vectorSimilarityWeight", vectorSimilarityWeight),
				zap.Float64("fullTextWeight", 1-vectorSimilarityWeight),
				zap.Float64("similarityThreshold", similarityThreshold),
				zap.Int("topK", topK),
				zap.Strings("crossLanguages", crossLanguages),
				zap.Bool("keyword", keyword),
				zap.String("rerankID", rerankID),
				zap.String("chatID", chatID),
				zap.Bool("useKG", useKG))
		} else {
			common.Warn("Invalid search_id: search_config missing or invalid", zap.String("searchID", searchID))
			return nil, fmt.Errorf("Invalid search_id")
		}
	}

	// If meta_data_filter method is auto/semi_auto, get chat model
	var err error
	var chatModelForFilter *models.ChatModel
	if metadataFilter != nil {
		method, _ := metadataFilter["method"].(string)
		if method == "auto" || method == "semi_auto" {
			if chatID != "" {
				driver, modelName, apiConfig, _, err := modelProviderSvc.GetModelConfigFromProviderInstance(tenantIDs[0], entity.ModelTypeChat, chatID)
				if err != nil {
					common.Warn("Failed to get chat model config from search_config chat_id, using tenant default", zap.String("chatID", chatID), zap.Error(err))
				} else {
					chatModelForFilter = models.NewChatModel(driver, &modelName, apiConfig)
					common.Info("Fetched chat model (from search_config) for metadata filter",
						zap.String("chatID", chatID),
						zap.String("tenantID", tenantIDs[0]))
				}
			}

			if chatModelForFilter == nil {
				driver, modelName, apiConfig, _, err := modelProviderSvc.GetTenantDefaultModelByType(tenantIDs[0], entity.ModelTypeChat)
				if err != nil {
					common.Warn("Failed to get tenant default chat model for meta_data_filter", zap.Error(err))
				} else {
					chatModelForFilter = models.NewChatModel(driver, &modelName, apiConfig)
					common.Info("Fetched chat model (tenant default) for metadata filter",
						zap.String("tenantID", tenantIDs[0]))
				}
			}
		}
	}

	// Apply meta_data_filter to get filtered doc_ids
	docIDs := make([]string, len(req.DocIDs))
	copy(docIDs, req.DocIDs)
	if metadataFilter != nil {
		metadataSvc := NewMetadataService()
		flattedMeta, err := metadataSvc.GetFlattedMetaByKBs(datasetIDs)
		if err != nil {
			common.Warn("Failed to get flatted metadata, using empty metadata for filter", zap.Error(err))
			flattedMeta = make(common.MetaData)
		}
		common.Info("Metadata filter conditions", zap.Any("filter", metadataFilter))
		filteredDocIDs, _ := ApplyMetaDataFilter(ctx, metadataFilter, flattedMeta, question, chatModelForFilter, req.DocIDs, datasetIDs)
		docIDs = filteredDocIDs
		common.Info("ApplyMetaDataFilter result", zap.Strings("docIDs", docIDs))
	}

	// Apply cross_languages and keyword extraction
	modifiedQuestion := question
	if len(crossLanguages) > 0 {
		// Pass tenantID and empty llmID so CrossLanguages can fetch default if needed
		// This matches Python's cross_languages(tenant_id, llm_id, query, languages)
		common.Info("CrossLanguages: dispatching translation",
			zap.String("tenantID", tenantIDs[0]),
			zap.String("llmID", ""),
			zap.Strings("crossLanguages", crossLanguages))
		translated, err := CrossLanguages(ctx, tenantIDs[0], "", question, crossLanguages)
		if err != nil {
			common.Warn("Failed to translate question", zap.String("llmID", ""), zap.Error(err))
		} else {
			modifiedQuestion = translated
		}
	}
	if keyword {
		driver, modelName, apiConfig, _, err := modelProviderSvc.GetTenantDefaultModelByType(tenantIDs[0], entity.ModelTypeChat)
		if err != nil {
			common.Warn("Failed to get default chat model for LLM transformations", zap.Error(err))
		} else {
			chatModel := models.NewChatModel(driver, &modelName, apiConfig)
			common.Info("Fetched chat model (tenant default) for keyword_extraction",
				zap.String("tenantID", tenantIDs[0]))

			extractedKeywords, err := KeywordExtraction(ctx, chatModel, modifiedQuestion, 3)
			if err != nil {
				common.Warn("Failed to extract keywords from question", zap.Error(err))
			} else if extractedKeywords != "" {
				modifiedQuestion = modifiedQuestion + extractedKeywords
			}
		}
	}
	if modifiedQuestion != question {
		common.Info("Modified question after transformations",
			zap.String("originalQuestion", question),
			zap.String("modifiedQuestion", modifiedQuestion),
			zap.Strings("crossLanguages", crossLanguages),
			zap.Bool("keywordExtraction", keyword))
	}

	// Get tag-based rank features via LabelQuestion
	metadataSvc := NewMetadataService()
	labels := metadataSvc.LabelQuestion(modifiedQuestion, kbRecords)
	if len(labels) > 0 {
		common.Debug("LabelQuestion result", zap.Any("labels", labels))
	}

	// Determine embedding model
	var embeddingModel *models.EmbeddingModel
	if kbRecords[0].EmbdID != "" {
		driver, modelName, apiConfig, maxTokens, embErr := modelProviderSvc.GetModelConfigFromProviderInstance(tenantIDs[0], entity.ModelTypeEmbedding, kbRecords[0].EmbdID)
		if embErr != nil {
			return nil, fmt.Errorf("failed to get embedding model by embd_id: %w", embErr)
		}
		embeddingModel = models.NewEmbeddingModel(driver, &modelName, apiConfig, maxTokens)
	} else {
		driver, modelName, apiConfig, maxTokens, err := modelProviderSvc.GetTenantDefaultModelByType(tenantIDs[0], entity.ModelTypeEmbedding)
		if err != nil {
			return nil, fmt.Errorf("failed to get tenant default embedding model: %w", err)
		}
		embeddingModel = models.NewEmbeddingModel(driver, &modelName, apiConfig, maxTokens)
	}
	modelNameStr := ""
	if embeddingModel.ModelName != nil {
		modelNameStr = *embeddingModel.ModelName
	}
	common.Info("Fetched embedding model for retrieval",
		zap.String("tenantID", tenantIDs[0]),
		zap.String("modelName", modelNameStr))

	// Get rerank model if rerankID is specified
	var rerankModel *models.RerankModel

	if rerankID != "" {
		driver, modelName, apiConfig, _, rErr := modelProviderSvc.GetModelConfigFromProviderInstance(tenantIDs[0], entity.ModelTypeRerank, rerankID)
		if rErr != nil {
			return nil, fmt.Errorf("failed to get rerank model by rerank_id: %w", rErr)
		}
		rerankModel = models.NewRerankModel(driver, &modelName, apiConfig)
	}

	if rerankModel != nil {
		common.Info("Fetched rerank model",
			zap.String("tenantID", tenantIDs[0]),
			zap.String("modelName", *rerankModel.ModelName))
	}

	retrievalReq := &nlp.RetrievalRequest{
		TenantIDs:              tenantIDs,
		Question:               modifiedQuestion,
		KbIDs:                  datasetIDs,
		DocIDs:                 docIDs,
		Page:                   page,
		PageSize:               pageSize,
		Top:                    &topK,
		SimilarityThreshold:    &similarityThreshold,
		VectorSimilarityWeight: &vectorSimilarityWeight,
		RerankModel:            rerankModel,
		RankFeature:            &labels,
		EmbeddingModel:         embeddingModel,
	}

	retrievalResult, err := nlp.NewRetrievalService(s.docEngine, s.documentDAO).Retrieval(ctx, retrievalReq)
	if err != nil {
		return nil, fmt.Errorf("retrieval search failed: %w", err)
	}

	filteredChunks := retrievalResult.Chunks

	if useKG {
		common.Warn("use_kg is not yet implemented in Go - skipping KG retrieval")
	}

	filteredChunks = nlp.RetrievalByChildren(filteredChunks, tenantIDs, s.docEngine, ctx)

	for i := range filteredChunks {
		delete(filteredChunks[i], "vector")
	}

	common.Info("SearchDatasets completed", zap.String("userID", userID), zap.Any("kbID", datasetIDs), zap.String("question", question), zap.Int64("chunkCount", int64(len(filteredChunks))))

	// Convert all float64 values to PyFloat64 for Python-compatible JSON serialization
	pyChunks := common.ConvertFloatsToPyFormat(filteredChunks).([]map[string]interface{})

	return &SearchDatasetsResponse{
		Chunks:  pyChunks,
		DocAggs: retrievalResult.DocAggs,
		Labels:  &labels,
		Total:   retrievalResult.Total,
	}, nil
}

// AutoMetadataField mirrors the REST dataset auto metadata field schema.
type AutoMetadataField struct {
	Name           string      `json:"name"`
	Type           string      `json:"type"`
	Description    *string     `json:"description,omitempty"`
	Examples       interface{} `json:"examples,omitempty"`
	RestrictValues bool        `json:"restrict_values,omitempty"`
}

// AutoMetadataConfig mirrors the REST dataset auto metadata schema.
type AutoMetadataConfig struct {
	Enabled *bool               `json:"enabled,omitempty"`
	Fields  []AutoMetadataField `json:"fields,omitempty"`
}

// MetadataConfigField mirrors one field in the dataset metadata config API.
type MetadataConfigField struct {
	Key         string   `json:"key"`
	Type        string   `json:"type"`
	Description *string  `json:"description"`
	Enum        []string `json:"enum"`
}

// MetadataConfigRequest mirrors PUT /datasets/:dataset_id/metadata/config.
type MetadataConfigRequest struct {
	Metadata        []MetadataConfigField `json:"metadata"`
	BuiltInMetadata []MetadataConfigField `json:"built_in_metadata"`
}

// CreateDatasetRequest represents the request for creating a dataset.
type CreateDatasetRequest struct {
	Name               string                 `json:"name" binding:"required"`
	Avatar             *string                `json:"avatar,omitempty"`
	Description        *string                `json:"description,omitempty"`
	EmbeddingModel     *string                `json:"embedding_model,omitempty"`
	Permission         *string                `json:"permission,omitempty"`
	ChunkMethod        *string                `json:"chunk_method,omitempty"`
	ParseType          *int                   `json:"parse_type,omitempty"`
	PipelineID         *string                `json:"pipeline_id,omitempty"`
	ParserConfig       map[string]interface{} `json:"parser_config,omitempty"`
	AutoMetadataConfig *AutoMetadataConfig    `json:"auto_metadata_config,omitempty"`
	Ext                map[string]interface{} `json:"ext,omitempty"`
}

// ListDatasets lists datasets with pagination and filtering.
func (s *DatasetService) ListDatasets(id, name string, page, pageSize int, orderby string, desc bool, keywords string, ownerIDs []string, parserID, userID string) ([]map[string]interface{}, int64, common.ErrorCode, error) {
	id = strings.TrimSpace(id)
	if id != "" {
		normalizedID, err := normalizeDatasetID(id)
		if err != nil {
			return nil, 0, common.CodeDataError, err
		}
		id = normalizedID

		kbs, err := s.kbDAO.GetKBByIDAndUserID(id, userID)
		if err != nil {
			return nil, 0, common.CodeServerError, errors.New("Database operation failed")
		}
		if len(kbs) == 0 {
			return nil, 0, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", userID, id)
		}
	}

	name = strings.TrimSpace(name)
	if name != "" {
		kbs, err := s.kbDAO.GetKBByNameAndUserID(name, userID)
		if err != nil {
			return nil, 0, common.CodeServerError, errors.New("Database operation failed")
		}
		if len(kbs) == 0 {
			return nil, 0, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", userID, name)
		}
	}

	if page <= 0 {
		page = 1
	}
	if pageSize <= 0 {
		pageSize = 30
	}

	orderby = strings.TrimSpace(orderby)
	if _, ok := datasetAllowedOrderByFields[orderby]; !ok {
		orderby = "create_time"
	}

	keywords = strings.TrimSpace(keywords)
	parserID = strings.TrimSpace(parserID)

	// Empty owner ids do not change the query, so only keep the meaningful ones.
	tenantIDs := make([]string, 0, len(ownerIDs))
	for _, ownerID := range ownerIDs {
		ownerID = strings.TrimSpace(ownerID)
		if ownerID != "" {
			tenantIDs = append(tenantIDs, ownerID)
		}
	}
	if len(tenantIDs) == 0 {
		joinedTenants, err := s.tenantDAO.GetJoinedTenantsByUserID(userID)
		if err != nil {
			return nil, 0, common.CodeServerError, errors.New("Database operation failed")
		}
		for _, joinedTenant := range joinedTenants {
			if joinedTenant == nil || joinedTenant.TenantID == "" {
				continue
			}
			tenantIDs = append(tenantIDs, joinedTenant.TenantID)
		}
	}

	kbs, total, err := s.kbDAO.GetByTenantIDs(tenantIDs, userID, page, pageSize, orderby, desc, keywords, parserID)
	if err != nil {
		return nil, 0, common.CodeServerError, errors.New("Database operation failed")
	}

	data := make([]map[string]interface{}, 0, len(kbs))
	for _, kb := range kbs {
		if kb == nil {
			continue
		}
		data = append(data, datasetListItemToMap(kb))
	}

	return data, total, common.CodeSuccess, nil
}

// CreateDataset creates a new dataset.
func (s *DatasetService) CreateDataset(req *CreateDatasetRequest, tenantID string) (map[string]interface{}, common.ErrorCode, error) {
	if !isValidString(req.Name) {
		return nil, common.CodeDataError, errors.New("Dataset name must be string.")
	}

	name := strings.TrimSpace(req.Name)
	if name == "" {
		return nil, common.CodeDataError, errors.New("Dataset name can't be empty.")
	}
	if len(name) > entity.DatasetNameLimit {
		return nil, common.CodeDataError, fmt.Errorf("Dataset name length is %d which is large than %d", len(name), entity.DatasetNameLimit)
	}

	tenant, err := s.tenantDAO.GetByID(tenantID)
	if err != nil || tenant == nil {
		return nil, common.CodeDataError, errors.New("Tenant not found.")
	}

	parserID := ""
	permission := "me"
	embeddingModel := ""
	parserConfig := req.ParserConfig
	pipelineID := req.PipelineID
	description := req.Description
	avatar := req.Avatar
	var language *string

	if req.Description != nil && len(*req.Description) > 65535 {
		return nil, common.CodeDataError, errors.New("String should have at most 65535 characters")
	}
	if req.Avatar != nil {
		if len(*req.Avatar) > 65535 {
			return nil, common.CodeDataError, errors.New("String should have at most 65535 characters")
		}
		if err := validateDatasetAvatar(*req.Avatar); err != nil {
			return nil, common.CodeDataError, err
		}
	}
	if req.Permission != nil {
		permission = strings.TrimSpace(*req.Permission)
		if permission != "me" && permission != "team" {
			return nil, common.CodeDataError, errors.New("Input should be 'me' or 'team'")
		}
	}
	if req.ChunkMethod != nil {
		parserID = strings.TrimSpace(*req.ChunkMethod)
		if err := validateDatasetChunkMethod(parserID); err != nil {
			return nil, common.CodeDataError, err
		}
		pipelineID = nil
	}
	if req.ParseType != nil && (*req.ParseType < 0 || *req.ParseType > 64) {
		return nil, common.CodeDataError, fmt.Errorf("Input should be between 0 and 64")
	}
	if req.PipelineID != nil {
		normalizedPipelineID, err := normalizeDatasetPipelineID(*req.PipelineID)
		if err != nil {
			return nil, common.CodeDataError, err
		}
		pipelineID = normalizedPipelineID
	}
	if req.EmbeddingModel != nil {
		embeddingModel = strings.TrimSpace(*req.EmbeddingModel)
		if err := validateDatasetEmbeddingModel(embeddingModel); err != nil {
			return nil, common.CodeDataError, err
		}
	}
	if err := validateDatasetParserConfigSize(parserConfig); err != nil {
		return nil, common.CodeDataError, err
	}

	// ext mirrors the Python REST implementation and overrides known top-level fields.
	for key, value := range req.Ext {
		switch key {
		case "name":
			nameValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Dataset name must be string.")
			}
			nameValue = strings.TrimSpace(nameValue)
			if nameValue == "" {
				return nil, common.CodeDataError, errors.New("Dataset name can't be empty.")
			}
			if len(nameValue) > entity.DatasetNameLimit {
				return nil, common.CodeDataError, fmt.Errorf("Dataset name length is %d which is large than %d", len(nameValue), entity.DatasetNameLimit)
			}
			name = nameValue
		case "description":
			descriptionValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Description must be string.")
			}
			if len(descriptionValue) > 65535 {
				return nil, common.CodeDataError, errors.New("String should have at most 65535 characters")
			}
			description = &descriptionValue
		case "avatar":
			avatarValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Avatar must be string.")
			}
			if len(avatarValue) > 65535 {
				return nil, common.CodeDataError, errors.New("String should have at most 65535 characters")
			}
			if err := validateDatasetAvatar(avatarValue); err != nil {
				return nil, common.CodeDataError, err
			}
			avatar = &avatarValue
		case "language":
			languageValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Language must be string.")
			}
			languageValue = strings.TrimSpace(languageValue)
			language = &languageValue
		case "permission":
			permissionValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Permission must be string.")
			}
			permissionValue = strings.TrimSpace(permissionValue)
			if permissionValue != "me" && permissionValue != "team" {
				return nil, common.CodeDataError, errors.New("Input should be 'me' or 'team'")
			}
			permission = permissionValue
		case "embedding_model", "embd_id":
			embeddingModelValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Embedding model identifier must follow <model_name>@<provider> format")
			}
			embeddingModelValue = strings.TrimSpace(embeddingModelValue)
			if err := validateDatasetEmbeddingModel(embeddingModelValue); err != nil {
				return nil, common.CodeDataError, err
			}
			embeddingModel = embeddingModelValue
		case "chunk_method", "parser_id":
			parserIDValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New(datasetChunkMethodErrorMessage)
			}
			parserIDValue = strings.TrimSpace(parserIDValue)
			if err := validateDatasetChunkMethod(parserIDValue); err != nil {
				return nil, common.CodeDataError, err
			}
			parserID = parserIDValue
			pipelineID = nil
		case "pipeline_id":
			pipelineIDValue, ok := value.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("pipeline_id must be 32 hex characters")
			}
			normalizedPipelineID, err := normalizeDatasetPipelineID(pipelineIDValue)
			if err != nil {
				return nil, common.CodeDataError, err
			}
			pipelineID = normalizedPipelineID
		case "parser_config":
			parserConfigValue, ok := value.(map[string]interface{})
			if !ok {
				return nil, common.CodeDataError, errors.New("parser_config must be valid JSON")
			}
			if err := validateDatasetParserConfigSize(parserConfigValue); err != nil {
				return nil, common.CodeDataError, err
			}
			parserConfig = parserConfigValue
		}
	}

	// parser_id wins when it is present; otherwise parse_type and pipeline_id must arrive together.
	if parserID == "" {
		if req.ParseType == nil && pipelineID == nil {
			parserID = "naive"
		} else if req.ParseType == nil || pipelineID == nil {
			missingFields := make([]string, 0, 2)
			if req.ParseType == nil {
				missingFields = append(missingFields, "parse_type")
			}
			if pipelineID == nil {
				missingFields = append(missingFields, "pipeline_id")
			}
			return nil, common.CodeDataError, fmt.Errorf("parser_id omitted -> required fields missing: %s", strings.Join(missingFields, ", "))
		}
	}

	if req.AutoMetadataConfig != nil {
		parserConfig = applyAutoMetadataConfig(parserConfig, req.AutoMetadataConfig)
	}

	parserConfig = common.GetParserConfig(parserID, parserConfig)
	parserConfig["llm_id"] = tenant.LLMID

	embdID := tenant.EmbdID
	if embeddingModel != "" {
		ok, message := s.verifyEmbeddingAvailability(embeddingModel, tenantID)
		if !ok {
			return nil, common.CodeDataError, errors.New(message)
		}
		embdID = embeddingModel
	}

	kbID := utility.GenerateToken()

	status := string(entity.StatusValid)
	// Deduplicate name within tenant
	duplicateName, err := common.DuplicateName(func(n, tid string) bool {
		existing, err := s.kbDAO.GetByName(n, tid)
		return err == nil && existing != nil
	}, name, tenantID)
	if err != nil {
		return nil, common.CodeDataError, err
	}

	kb := &entity.Knowledgebase{
		ID:           kbID,
		Name:         duplicateName,
		TenantID:     tenantID,
		CreatedBy:    tenantID,
		ParserID:     parserID,
		PipelineID:   pipelineID,
		ParserConfig: parserConfig,
		Permission:   permission,
		EmbdID:       embdID,
		Status:       &status,
	}

	if description != nil {
		kb.Description = description
	}
	if avatar != nil {
		kb.Avatar = avatar
	}
	if language != nil {
		kb.Language = language
	}

	if err := s.kbDAO.Create(kb); err != nil {
		return nil, common.CodeServerError, errors.New("Failed to save dataset")
	}

	createdKB, err := s.kbDAO.GetByID(kbID)
	if err != nil || createdKB == nil {
		return nil, common.CodeServerError, errors.New("Dataset created failed")
	}

	return datasetToMap(createdKB), common.CodeSuccess, nil
}

// DeleteDatasets deletes multiple datasets.
func (s *DatasetService) DeleteDatasets(ids []string, deleteAll bool, tenantID string) (map[string]interface{}, common.ErrorCode, error) {
	normalizedIDs := make([]string, 0, len(ids))
	seenIDs := make(map[string]struct{}, len(ids))

	// Canonicalize ids once so every downstream DAO call sees the same 32-char hex format.
	for _, id := range ids {
		normalizedID, err := normalizeDatasetID(strings.TrimSpace(id))
		if err != nil {
			return nil, common.CodeDataError, err
		}
		if _, exists := seenIDs[normalizedID]; exists {
			return nil, common.CodeDataError, fmt.Errorf("Duplicate ids: '%s'", normalizedID)
		}
		seenIDs[normalizedID] = struct{}{}
		normalizedIDs = append(normalizedIDs, normalizedID)
	}

	if len(normalizedIDs) == 0 {
		if !deleteAll {
			return map[string]interface{}{"success_count": 0}, common.CodeSuccess, nil
		}

		kbs, err := s.kbDAO.Query(map[string]interface{}{"tenant_id": tenantID})
		if err != nil {
			return nil, common.CodeServerError, errors.New("Database operation failed")
		}
		for _, kb := range kbs {
			normalizedIDs = append(normalizedIDs, kb.ID)
		}
	}

	kbs := make([]*entity.Knowledgebase, 0, len(normalizedIDs))
	unauthorizedIDs := make([]string, 0)
	for _, id := range normalizedIDs {
		kb, err := s.kbDAO.GetByIDAndTenantID(id, tenantID)
		if err != nil || kb == nil {
			unauthorizedIDs = append(unauthorizedIDs, id)
			continue
		}
		kbs = append(kbs, kb)
	}
	if len(unauthorizedIDs) > 0 {
		return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for datasets: '%s'", tenantID, strings.Join(unauthorizedIDs, ", "))
	}

	errorsList := make([]string, 0)
	successCount := 0
	for _, kb := range kbs {
		if err := s.deleteDataset(tenantID, kb); err != nil {
			errorsList = append(errorsList, err.Error())
			continue
		}
		successCount++
	}

	if len(errorsList) == 0 {
		return map[string]interface{}{"success_count": successCount}, common.CodeSuccess, nil
	}

	details := strings.Join(errorsList, "; ")
	if len(details) > 128 {
		details = details[:128]
	}
	errorMessage := fmt.Sprintf(
		"Successfully deleted %d datasets, %d failed. Details: %s...",
		successCount,
		len(errorsList),
		details,
	)
	if successCount == 0 {
		return nil, common.CodeDataError, errors.New(errorMessage)
	}

	return map[string]interface{}{
		"success_count": successCount,
		"errors":        limitStrings(errorsList, 5),
	}, common.CodeSuccess, nil
}

// GetDataset gets a single dataset with its size and linked connectors.
func (s *DatasetService) GetDataset(datasetID, userID string) (map[string]interface{}, common.ErrorCode, error) {
	datasetID = strings.TrimSpace(datasetID)
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New("Lack of \"Dataset ID\"")
	}

	normalizedID, err := normalizeDatasetID(datasetID)
	if err != nil {
		return nil, common.CodeDataError, err
	}
	datasetID = normalizedID

	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", userID, datasetID)
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil || kb == nil {
		return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
	}

	data := datasetToMap(kb)

	size, err := s.documentDAO.SumSizeByDatasetID(datasetID)
	if err != nil {
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}
	data["size"] = size

	connectors, err := s.connectorDAO.ListByDatasetID(datasetID)
	if err != nil {
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}
	data["connectors"] = datasetConnectorsOrEmpty(connectors)

	return data, common.CodeSuccess, nil
}

type DatasetConnectorRequest struct {
	ID        string `json:"id"`
	AutoParse string `json:"auto_parse,omitempty"`
}

type UpdateDatasetRequest struct {
	Name               *string                    `json:"name,omitempty"`
	Avatar             *string                    `json:"avatar,omitempty"`
	Description        *string                    `json:"description,omitempty"`
	Language           *string                    `json:"language,omitempty"`
	Connectors         *[]DatasetConnectorRequest `json:"connectors,omitempty"`
	EmbdID             *string                    `json:"embd_id,omitempty"`
	EmbeddingModel     *string                    `json:"embedding_model,omitempty"`
	Permission         *string                    `json:"permission,omitempty"`
	ParserID           *string                    `json:"parser_id,omitempty"`
	ChunkMethod        *string                    `json:"chunk_method,omitempty"`
	Pagerank           *int64                     `json:"pagerank,omitempty"`
	ParserConfig       map[string]interface{}     `json:"parser_config,omitempty"`
	PipelineID         *string                    `json:"pipeline_id,omitempty"`
	AutoMetadataConfig *AutoMetadataConfig        `json:"auto_metadata_config,omitempty"`
	Ext                map[string]interface{}     `json:"ext,omitempty"`
}

// UpdateDataset Update a dataset
func (s *DatasetService) UpdateDataset(datasetID, tenantID string, req UpdateDatasetRequest) (map[string]interface{}, common.ErrorCode, error) {
	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, errors.New("Dataset not found")
		}
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}

	if kb == nil || kb.TenantID != tenantID {
		return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", tenantID, datasetID)
	}

	connectorsProvided := req.Connectors != nil
	connectors := make([]DatasetConnectorRequest, 0)
	if req.Connectors != nil {
		connectors = *req.Connectors
	}

	updates := make(map[string]interface{})
	extUpdates := normalizeDatasetUpdateExt(req.Ext)

	if req.Name != nil {
		name := strings.TrimSpace(*req.Name)
		if name == "" {
			return nil, common.CodeDataError, errors.New("String should have at least 1 character")
		}
		if len(name) > 128 {
			return nil, common.CodeDataError, errors.New("String should have at most 128 characters")
		}
		updates["name"] = name
	}
	if req.Avatar != nil {
		if len(*req.Avatar) > 65535 {
			return nil, common.CodeDataError, errors.New("String should have at most 65535 characters")
		}
		if err := validateDatasetAvatar(*req.Avatar); err != nil {
			return nil, common.CodeDataError, err
		}
		updates["avatar"] = *req.Avatar
	}
	if req.Description != nil {
		if len(*req.Description) > 65535 {
			return nil, common.CodeDataError, errors.New("String should have at most 65535 characters")
		}
		updates["description"] = *req.Description
	}
	if req.Language != nil {
		language := strings.TrimSpace(*req.Language)
		if len(language) > 32 {
			return nil, common.CodeDataError, errors.New("String should have at most 32 characters")
		}
		updates["language"] = language
	}
	if req.Permission != nil {
		permission := strings.TrimSpace(*req.Permission)
		if permission != "me" && permission != "team" {
			return nil, common.CodeDataError, errors.New("Input should be 'me' or 'team'")
		}
		updates["permission"] = permission
	}
	if req.PipelineID != nil {
		pipelineID, err := normalizeDatasetPipelineID(*req.PipelineID)
		if err != nil {
			return nil, common.CodeDataError, err
		}
		if pipelineID != nil {
			updates["pipeline_id"] = *pipelineID
		}
	}

	for key, value := range extUpdates {
		if _, exists := updates[key]; !exists {
			updates[key] = value
		}
	}

	parserID, parserIDProvided, err := datasetUpdateParserID(req)
	if err != nil {
		return nil, common.CodeDataError, err
	}
	if !parserIDProvided {
		if extParserID, ok := updates["parser_id"]; ok {
			parserIDValue, ok := extParserID.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New(datasetChunkMethodErrorMessage)
			}
			parserID = strings.TrimSpace(parserIDValue)
			if err := validateDatasetChunkMethod(parserID); err != nil {
				return nil, common.CodeDataError, err
			}
			parserIDProvided = true
		}
	}
	if parserIDProvided {
		updates["parser_id"] = parserID
	}

	embdID, embdIDProvided, err := datasetUpdateEmbeddingID(req)
	if err != nil {
		return nil, common.CodeDataError, err
	}
	if !embdIDProvided {
		if extEmbdID, ok := updates["embd_id"]; ok {
			embdIDValue, ok := extEmbdID.(string)
			if !ok {
				return nil, common.CodeDataError, errors.New("Embedding model identifier must follow <model_name>@<provider> format")
			}
			embdID = strings.TrimSpace(embdIDValue)
			if embdID != "" {
				if err := validateDatasetEmbeddingModel(embdID); err != nil {
					return nil, common.CodeDataError, err
				}
			}
			embdIDProvided = true
		}
	}
	if embdIDProvided {
		if embdID == "" {
			embdID = kb.EmbdID
		}
		ok, message := s.verifyEmbeddingAvailability(embdID, tenantID)
		if !ok {
			return nil, common.CodeDataError, errors.New(message)
		}
		updates["embd_id"] = embdID
	}

	if req.AutoMetadataConfig != nil {
		req.ParserConfig = applyAutoMetadataConfig(req.ParserConfig, req.AutoMetadataConfig)
	}
	if req.ParserConfig != nil {
		if err := validateDatasetParserConfigSize(req.ParserConfig); err != nil {
			return nil, common.CodeDataError, err
		}
		if len(req.ParserConfig) > 0 {
			parserConfig := normalizeDatasetUpdateParserConfig(req.ParserConfig)
			updates["parser_config"] = entity.JSONMap(common.DeepMergeMaps(kb.ParserConfig, parserConfig))
		}
	}

	if req.Pagerank != nil && *req.Pagerank != kb.Pagerank {
		if *req.Pagerank < 0 || *req.Pagerank > 100 {
			return nil, common.CodeDataError, errors.New("Input should be less than or equal to 100")
		}
		if s.engineType == server.EngineInfinity {
			return nil, common.CodeDataError, errors.New("'pagerank' can only be set when doc_engine is elasticsearch")
		}
		indexName := fmt.Sprintf("ragflow_%s", kb.TenantID)
		if *req.Pagerank > 0 {
			err = s.docEngine.UpdateChunks(context.Background(), map[string]interface{}{"kb_id": kb.ID}, map[string]interface{}{common.PAGERANK_FLD: *req.Pagerank}, indexName, kb.ID)
		} else {
			err = s.docEngine.UpdateChunks(context.Background(), map[string]interface{}{"exists": common.PAGERANK_FLD}, map[string]interface{}{"remove": common.PAGERANK_FLD}, indexName, kb.ID)
		}
		if err != nil {
			return nil, common.CodeServerError, err
		}
		updates["pagerank"] = *req.Pagerank
	}

	if parserIDProvided && parserID != kb.ParserID {
		if _, ok := updates["parser_config"]; !ok {
			updates["parser_config"] = entity.JSONMap(common.GetParserConfig(parserID, nil))
		}
	}
	if kb.PipelineID != nil && parserIDProvided {
		if _, ok := updates["pipeline_id"]; !ok {
			updates["pipeline_id"] = ""
		}
	}

	if nameValue, ok := updates["name"].(string); ok && strings.ToLower(nameValue) != strings.ToLower(kb.Name) {
		existing, lookupErr := s.kbDAO.GetByName(nameValue, tenantID)
		if lookupErr != nil && !dao.IsNotFoundErr(lookupErr) {
			return nil, common.CodeServerError, errors.New("Database operation failed")
		}
		if existing != nil {
			return nil, common.CodeDataError, fmt.Errorf("Dataset name '%s' already exists", nameValue)
		}
	}

	if len(updates) == 0 && !connectorsProvided {
		return nil, common.CodeDataError, errors.New("No properties were modified")
	}

	if len(updates) > 0 {
		if err = s.kbDAO.UpdateByID(kb.ID, updates); err != nil {
			return nil, common.CodeServerError, errors.New("Update dataset error.(Database error)")
		}
	}

	if connectorsProvided {
		connectorLinks := make([]dao.DatasetConnectorLink, 0, len(connectors))
		for _, connector := range connectors {
			connectorID := strings.TrimSpace(connector.ID)
			if connectorID == "" {
				return nil, common.CodeDataError, errors.New("connector id is required")
			}
			connectorLinks = append(connectorLinks, dao.DatasetConnectorLink{
				ID:        connectorID,
				AutoParse: connector.AutoParse,
			})
		}
		if err = s.connectorDAO.LinkDatasetConnectors(kb.ID, connectorLinks); err != nil {
			return nil, common.CodeServerError, errors.New("Database operation failed")
		}
	}

	updatedKB, err := s.kbDAO.GetByID(kb.ID)
	if err != nil {
		return nil, common.CodeDataError, errors.New("Dataset updated failed")
	}

	data := datasetToMap(updatedKB)
	linkedConnectors, err := s.connectorDAO.ListByDatasetID(kb.ID)
	if err != nil {
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}
	data["connectors"] = datasetConnectorsOrEmpty(linkedConnectors)
	return data, common.CodeSuccess, nil
}

func datasetConnectorsOrEmpty(connectors []*dao.ConnectorDatasetListItem) []*dao.ConnectorDatasetListItem {
	if connectors == nil {
		return make([]*dao.ConnectorDatasetListItem, 0)
	}
	return connectors
}

func datasetUpdateParserID(req UpdateDatasetRequest) (string, bool, error) {
	parserID := ""
	provided := false
	if req.ParserID != nil {
		parserID = strings.TrimSpace(*req.ParserID)
		provided = true
	}
	if req.ChunkMethod != nil {
		parserID = strings.TrimSpace(*req.ChunkMethod)
		provided = true
	}
	if !provided {
		return "", false, nil
	}
	if err := validateDatasetChunkMethod(parserID); err != nil {
		return "", true, err
	}
	return parserID, true, nil
}

func datasetUpdateEmbeddingID(req UpdateDatasetRequest) (string, bool, error) {
	embdID := ""
	provided := false
	if req.EmbdID != nil {
		embdID = strings.TrimSpace(*req.EmbdID)
		provided = true
	}
	if req.EmbeddingModel != nil {
		embdID = strings.TrimSpace(*req.EmbeddingModel)
		provided = true
	}
	if !provided {
		return "", false, nil
	}
	if embdID != "" {
		if err := validateDatasetEmbeddingModel(embdID); err != nil {
			return "", true, err
		}
	}
	return embdID, true, nil
}

func normalizeDatasetUpdateExt(ext map[string]interface{}) map[string]interface{} {
	if ext == nil {
		return nil
	}

	updates := make(map[string]interface{}, len(ext))
	for key, value := range ext {
		switch key {
		case "embedding_model":
			updates["embd_id"] = value
		case "chunk_method":
			updates["parser_id"] = value
		case "connectors", "auto_metadata_config", "ext", "parse_type":
			continue
		default:
			updates[key] = value
		}
	}
	return updates
}

func normalizeDatasetUpdateParserConfig(parserConfig map[string]interface{}) map[string]interface{} {
	normalized := common.DeepMergeMaps(nil, parserConfig)
	parentChild, _ := normalized["parent_child"].(map[string]interface{})
	if parentChild == nil {
		parentChild = map[string]interface{}{}
	}

	if datasetBoolValue(parentChild["use_parent_child"]) {
		childrenDelimiter, ok := parentChild["children_delimiter"]
		if !ok {
			childrenDelimiter = "\n"
		}
		normalized["children_delimiter"] = childrenDelimiter
		enableChildren, ok := parentChild["use_parent_child"]
		if !ok {
			enableChildren = true
		}
		normalized["enable_children"] = enableChildren
	} else {
		normalized["children_delimiter"] = ""
		normalized["enable_children"] = false
		normalized["parent_child"] = map[string]interface{}{}
	}

	if extFields, ok := normalized["ext"].(map[string]interface{}); ok {
		delete(normalized, "ext")
		for key, value := range extFields {
			normalized[key] = value
		}
	}

	return normalized
}

func datasetBoolValue(value interface{}) bool {
	switch typedValue := value.(type) {
	case bool:
		return typedValue
	case string:
		return typedValue == "1" || strings.EqualFold(typedValue, "true")
	case int:
		return typedValue != 0
	case int64:
		return typedValue != 0
	case float64:
		return typedValue != 0
	default:
		return false
	}
}

// GetMetadataConfig gets the auto-metadata configuration for a dataset.
func (s *DatasetService) GetMetadataConfig(datasetID, tenantID string) (map[string]interface{}, common.ErrorCode, error) {
	kb, err := s.kbDAO.GetByIDAndTenantID(datasetID, tenantID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", tenantID, datasetID)
		}
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}
	if kb == nil {
		return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", tenantID, datasetID)
	}

	return map[string]interface{}{
		"metadata":          parserConfigValueOrEmptyList(kb.ParserConfig, "metadata"),
		"built_in_metadata": parserConfigValueOrEmptyList(kb.ParserConfig, "built_in_metadata"),
	}, common.CodeSuccess, nil
}

// UpdateMetadataConfig updates the auto-metadata configuration for a dataset.
func (s *DatasetService) UpdateMetadataConfig(datasetID, tenantID string, req *MetadataConfigRequest) (map[string]interface{}, common.ErrorCode, error) {
	datasetID = strings.TrimSpace(datasetID)
	tenantID = strings.TrimSpace(tenantID)

	kb, err := s.kbDAO.GetByIDAndTenantID(datasetID, tenantID)
	if err != nil {
		if dao.IsNotFoundErr(err) {
			return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", tenantID, datasetID)
		}
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}
	if kb == nil {
		return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", tenantID, datasetID)
	}

	if req == nil {
		req = &MetadataConfigRequest{}
	}

	metadata, err := normalizeMetadataConfigFields(req.Metadata, "metadata")
	if err != nil {
		return nil, common.CodeDataError, err
	}
	builtInMetadata, err := normalizeMetadataConfigFields(req.BuiltInMetadata, "built_in_metadata")
	if err != nil {
		return nil, common.CodeDataError, err
	}

	parserConfig := kb.ParserConfig
	if parserConfig == nil {
		parserConfig = entity.JSONMap{}
	}
	parserConfig["metadata"] = metadata
	parserConfig["built_in_metadata"] = builtInMetadata

	if err := s.kbDAO.UpdateByID(kb.ID, map[string]interface{}{"parser_config": parserConfig}); err != nil {
		return nil, common.CodeServerError, errors.New("Update auto-metadata error.(Database error)")
	}

	return map[string]interface{}{
		"metadata":          metadata,
		"built_in_metadata": builtInMetadata,
	}, common.CodeSuccess, nil
}

// Accessible checks if a knowledge base is accessible by a user
func (s *DatasetService) Accessible(kbID, userID string) bool {
	return s.kbDAO.Accessible(kbID, userID)
}

// GetKnowledgebaseByID resolves a dataset entity without applying permission
// checks. Upload needs the same existence-then-auth ordering as Python.
func (s *DatasetService) GetKnowledgebaseByID(datasetID string) (*entity.Knowledgebase, error) {
	datasetID = strings.TrimSpace(datasetID)
	if datasetID == "" {
		return nil, errors.New("Lack of \"Dataset ID\"")
	}
	normalizedID, err := normalizeDatasetID(datasetID)
	if err != nil {
		return nil, err
	}
	return s.kbDAO.GetByID(normalizedID)
}

// CheckKBTeamPermission mirrors Python check_kb_team_permission.
func (s *DatasetService) CheckKBTeamPermission(kb *entity.Knowledgebase, userID string) bool {
	return hasKBTeamPermission(kb, userID, s.tenantDAO)
}

func (s *DatasetService) AggregateTags(datasetIDs []string, userID string) ([]map[string]interface{}, common.ErrorCode, error) {
	if len(datasetIDs) == 0 {
		return nil, common.CodeDataError, errors.New("Lack of dataset_ids in query parameters")
	}
	if s.docEngine == nil {
		return nil, common.CodeServerError, errors.New("Document engine is not initialized")
	}

	datasetIDsByTenant := make(map[string][]string)
	for _, rawID := range datasetIDs {
		rawID = strings.TrimSpace(rawID)
		if rawID == "" {
			continue
		}
		datasetID, err := normalizeDatasetID(rawID)
		if err != nil {
			return nil, common.CodeDataError, err
		}
		if !s.kbDAO.Accessible(datasetID, userID) {
			return nil, common.CodeDataError, fmt.Errorf("No authorization for dataset '%s'", datasetID)
		}
		kb, err := s.kbDAO.GetByID(datasetID)
		if err != nil {
			if dao.IsNotFoundErr(err) {
				return nil, common.CodeDataError, fmt.Errorf("Invalid Dataset ID '%s'", datasetID)
			}
			return nil, common.CodeServerError, errors.New("Database operation failed")
		}
		if kb.DocNum <= 0 {
			continue
		}
		datasetIDsByTenant[kb.TenantID] = append(datasetIDsByTenant[kb.TenantID], datasetID)
	}

	const pageSize = 10000
	merged := make(map[string]int)
	for tenantID, kbIDs := range datasetIDsByTenant {
		for offset := 0; ; offset += pageSize {
			searchResp, err := s.docEngine.Search(context.Background(), &types.SearchRequest{
				IndexNames:   []string{fmt.Sprintf("ragflow_%s", tenantID)},
				KbIDs:        kbIDs,
				Offset:       offset,
				Limit:        pageSize,
				SelectFields: []string{"tag_kwd"},
			})
			if err != nil {
				return nil, common.CodeServerError, fmt.Errorf("failed to aggregate tags: %w", err)
			}
			for _, agg := range s.docEngine.GetAggregation(searchResp.Chunks, "tag_kwd") {
				tag, _ := agg["key"].(string)
				if tag == "" {
					continue
				}
				switch count := agg["count"].(type) {
				case int:
					merged[tag] += count
				case int32:
					merged[tag] += int(count)
				case int64:
					merged[tag] += int(count)
				case float64:
					merged[tag] += int(count)
				}
			}

			chunkCount := len(searchResp.Chunks)
			if chunkCount == 0 || chunkCount < pageSize {
				break
			}
			if searchResp.Total > 0 && int64(offset+chunkCount) >= searchResp.Total {
				break
			}
		}
	}
	result := make([]map[string]interface{}, 0, len(merged))
	for tag, count := range merged {
		result = append(result, map[string]interface{}{
			"value": tag,
			"count": count,
		})
	}
	return result, common.CodeSuccess, nil
}

func (s *DatasetService) ListTags(datasetID, userID string) ([]map[string]interface{}, common.ErrorCode, error) {
	datasetID = strings.TrimSpace(datasetID)
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New("Lack of \"Dataset ID\"")
	}

	normalizedID, err := normalizeDatasetID(datasetID)
	if err != nil {
		return nil, common.CodeDataError, err
	}
	datasetID = normalizedID

	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}
	if s.docEngine == nil {
		return nil, common.CodeServerError, errors.New("Document engine is not initialized")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil || kb == nil {
		return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
	}

	indexName := fmt.Sprintf("ragflow_%s", kb.TenantID)

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	exists, err := s.docEngine.ChunkStoreExists(ctx, indexName, datasetID)
	if err != nil {
		return nil, common.CodeServerError, fmt.Errorf("failed to inspect chunk store: %w", err)
	}
	if !exists {
		return []map[string]interface{}{}, common.CodeSuccess, nil
	}

	const pageSize = 10000
	counts := make(map[string]int)
	for offset := 0; ; offset += pageSize {
		if err := ctx.Err(); err != nil {
			return nil, common.CodeServerError, fmt.Errorf("list tags timeout or canceled: %w", err)
		}

		searchResp, err := s.docEngine.Search(ctx, &types.SearchRequest{
			IndexNames:   []string{indexName},
			KbIDs:        []string{datasetID},
			Offset:       offset,
			Limit:        pageSize,
			SelectFields: []string{"tag_kwd"},
		})
		if err != nil {
			return nil, common.CodeServerError, fmt.Errorf("failed to list tags: %w", err)
		}

		for _, agg := range s.docEngine.GetAggregation(searchResp.Chunks, "tag_kwd") {
			tag, _ := agg["key"].(string)
			if tag == "" {
				continue
			}
			switch count := agg["count"].(type) {
			case int:
				counts[tag] += count
			case int32:
				counts[tag] += int(count)
			case int64:
				counts[tag] += int(count)
			case float64:
				counts[tag] += int(count)
			}
		}

		chunkCount := len(searchResp.Chunks)
		if chunkCount == 0 || chunkCount < pageSize {
			break
		}
		if searchResp.Total > 0 && int64(offset+chunkCount) >= searchResp.Total {
			break
		}
	}

	if len(counts) == 0 {
		return []map[string]interface{}{}, common.CodeSuccess, nil
	}

	tags := make([]string, 0, len(counts))
	for tag := range counts {
		tags = append(tags, tag)
	}
	sort.Slice(tags, func(i, j int) bool {
		if counts[tags[i]] != counts[tags[j]] {
			return counts[tags[i]] > counts[tags[j]]
		}
		return tags[i] < tags[j]
	})

	result := make([]map[string]interface{}, 0, len(tags))
	for _, tag := range tags {
		result = append(result, map[string]interface{}{
			"key":   tag,
			"count": counts[tag],
		})
	}

	return result, common.CodeSuccess, nil
}

// GetIngestionSummary returns dataset-level ingestion counters together with
// the aggregated document parsing status, mirroring
// dataset_api_service.get_ingestion_summary.
func (s *DatasetService) GetIngestionSummary(datasetID, userID string) (map[string]interface{}, common.ErrorCode, error) {
	datasetID = strings.TrimSpace(datasetID)
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New("Lack of \"Dataset ID\"")
	}

	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, fmt.Errorf("User '%s' lacks permission for dataset '%s'", userID, datasetID)
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil || kb == nil {
		return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
	}

	status, err := s.documentDAO.GetParsingStatusByKBID(datasetID)
	if err != nil {
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}

	return map[string]interface{}{
		"doc_num":   kb.DocNum,
		"chunk_num": kb.ChunkNum,
		"token_num": kb.TokenNum,
		"status":    status,
	}, common.CodeSuccess, nil
}

// ListIngestionLogs lists ingestion logs for a dataset, mirroring
// dataset_api_service.list_ingestion_logs. log_type selects between
// dataset-level logs ("dataset") and per-file logs ("file").
func (s *DatasetService) ListIngestionLogs(datasetID, userID string, page, pageSize int, orderby string, desc bool, operationStatus []string, createDateFrom, createDateTo, logType, keywords string) (map[string]interface{}, common.ErrorCode, error) {
	datasetID = strings.TrimSpace(datasetID)
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New("Lack of \"Dataset ID\"")
	}

	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}

	if logType != "dataset" && logType != "file" {
		return nil, common.CodeDataError, errors.New("Invalid \"log_type\", expected \"dataset\" or \"file\"")
	}

	var (
		logs  []*entity.PipelineOperationLog
		total int64
		err   error
	)
	if logType == "file" {
		logs, total, err = s.pipelineLogDAO.GetFileLogsByKBID(datasetID, page, pageSize, orderby, desc, keywords, operationStatus, createDateFrom, createDateTo)
	} else {
		logs, total, err = s.pipelineLogDAO.GetDatasetLogsByKBID(datasetID, page, pageSize, orderby, desc, operationStatus, createDateFrom, createDateTo, keywords)
	}
	if err != nil {
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}

	items := make([]map[string]interface{}, 0, len(logs))
	for _, log := range logs {
		if log == nil {
			continue
		}
		if logType == "file" {
			items = append(items, fileIngestionLogToMap(log))
		} else {
			items = append(items, datasetIngestionLogToMap(log))
		}
	}

	return map[string]interface{}{
		"total": total,
		"logs":  items,
	}, common.CodeSuccess, nil
}

// GetIngestionLog returns a single ingestion log, mirroring
// dataset_api_service.get_ingestion_log. It returns the full record (including
// the `dsl`, `document_id`, `parser_id`, etc.) so that the front-end
// dataflow-result page can render the pipeline timeline and chunks. The
// file-level converter is a superset of the dataset-level fields, so it is
// correct for both dataset-level (graph/raptor/mindmap) and per-file logs.
func (s *DatasetService) GetIngestionLog(datasetID, userID, logID string) (map[string]interface{}, common.ErrorCode, error) {
	datasetID = strings.TrimSpace(datasetID)
	if datasetID == "" {
		return nil, common.CodeDataError, errors.New("Lack of \"Dataset ID\"")
	}

	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}

	log, err := s.pipelineLogDAO.GetByIDAndKBID(logID, datasetID)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, common.CodeDataError, errors.New("Log not found")
		}
		return nil, common.CodeServerError, errors.New("Database operation failed")
	}

	return fileIngestionLogToMap(log), common.CodeSuccess, nil
}

func datasetIngestionLogToMap(log *entity.PipelineOperationLog) map[string]interface{} {
	return map[string]interface{}{
		"id":               log.ID,
		"tenant_id":        log.TenantID,
		"kb_id":            log.KbID,
		"progress":         log.Progress,
		"progress_msg":     stringPointerValue(log.ProgressMsg),
		"process_begin_at": timePointerValue(log.ProcessBeginAt),
		"process_duration": log.ProcessDuration,
		"task_type":        log.TaskType,
		"operation_status": log.OperationStatus,
		"avatar":           stringPointerValue(log.Avatar),
		"status":           stringPointerValue(log.Status),
		"create_time":      int64PointerValue(log.CreateTime),
		"create_date":      timePointerValue(log.CreateDate),
		"update_time":      int64PointerValue(log.UpdateTime),
		"update_date":      timePointerValue(log.UpdateDate),
	}
}

func fileIngestionLogToMap(log *entity.PipelineOperationLog) map[string]interface{} {
	return map[string]interface{}{
		"id":               log.ID,
		"document_id":      log.DocumentID,
		"tenant_id":        log.TenantID,
		"kb_id":            log.KbID,
		"pipeline_id":      stringPointerValue(log.PipelineID),
		"pipeline_title":   stringPointerValue(log.PipelineTitle),
		"parser_id":        log.ParserID,
		"document_name":    log.DocumentName,
		"document_suffix":  log.DocumentSuffix,
		"document_type":    log.DocumentType,
		"source_from":      log.SourceFrom,
		"progress":         log.Progress,
		"progress_msg":     stringPointerValue(log.ProgressMsg),
		"process_begin_at": timePointerValue(log.ProcessBeginAt),
		"process_duration": log.ProcessDuration,
		"dsl":              jsonMapValue(log.DSL),
		"task_type":        log.TaskType,
		"operation_status": log.OperationStatus,
		"avatar":           stringPointerValue(log.Avatar),
		"status":           stringPointerValue(log.Status),
		"create_time":      int64PointerValue(log.CreateTime),
		"create_date":      timePointerValue(log.CreateDate),
		"update_time":      int64PointerValue(log.UpdateTime),
		"update_date":      timePointerValue(log.UpdateDate),
	}
}

func stringPointerValue(s *string) interface{} {
	if s == nil {
		return nil
	}
	return *s
}

func int64PointerValue(i *int64) interface{} {
	if i == nil {
		return nil
	}
	return *i
}

func timePointerValue(t *time.Time) interface{} {
	if t == nil {
		return nil
	}
	return t.Format("2006-01-02 15:04:05")
}

func jsonMapValue(m entity.JSONMap) interface{} {
	if m == nil {
		return nil
	}
	return m
}

func (s *DatasetService) deleteDataset(tenantID string, kb *entity.Knowledgebase) error {
	return dao.DB.Transaction(func(tx *gorm.DB) error {
		if taskIDs := datasetIndexTaskIDs(kb); len(taskIDs) > 0 {
			if err := tx.Where("id IN ?", taskIDs).Delete(&entity.Task{}).Error; err != nil {
				return fmt.Errorf("Delete dataset error for %s", kb.ID)
			}
		}

		var documents []entity.Document
		if err := tx.Where("kb_id = ?", kb.ID).Find(&documents).Error; err != nil {
			return fmt.Errorf("Delete dataset error for %s", kb.ID)
		}

		docIDs := make([]string, 0, len(documents))
		for _, document := range documents {
			docIDs = append(docIDs, document.ID)
		}

		if len(docIDs) > 0 {
			var mappings []entity.File2Document
			if err := tx.Where("document_id IN ?", docIDs).Find(&mappings).Error; err != nil {
				return fmt.Errorf("Delete dataset error for %s", kb.ID)
			}

			fileIDs := make([]string, 0, len(mappings))
			seenFileIDs := make(map[string]struct{}, len(mappings))
			for _, mapping := range mappings {
				if mapping.FileID == nil || *mapping.FileID == "" {
					continue
				}
				if _, exists := seenFileIDs[*mapping.FileID]; exists {
					continue
				}
				seenFileIDs[*mapping.FileID] = struct{}{}
				fileIDs = append(fileIDs, *mapping.FileID)
			}

			if err := tx.Where("doc_id IN ?", docIDs).Delete(&entity.Task{}).Error; err != nil {
				return fmt.Errorf("Delete dataset error for %s", kb.ID)
			}
			if err := tx.Where("document_id IN ?", docIDs).Delete(&entity.File2Document{}).Error; err != nil {
				return fmt.Errorf("Delete dataset error for %s", kb.ID)
			}
			if len(fileIDs) > 0 {
				if err := tx.Unscoped().Where("id IN ?", fileIDs).Delete(&entity.File{}).Error; err != nil {
					return fmt.Errorf("Delete dataset error for %s", kb.ID)
				}
			}
			if err := tx.Where("id IN ?", docIDs).Delete(&entity.Document{}).Error; err != nil {
				return fmt.Errorf("Delete dataset error for %s", kb.ID)
			}
		}

		if err := tx.Unscoped().
			Where("source_type = ? AND type = ? AND name = ? AND tenant_id = ?", string(entity.FileSourceKnowledgebase), "folder", kb.Name, tenantID).
			Delete(&entity.File{}).Error; err != nil {
			return fmt.Errorf("Delete dataset error for %s", kb.ID)
		}

		if err := tx.Where("id = ?", kb.ID).Delete(&entity.Knowledgebase{}).Error; err != nil {
			return fmt.Errorf("Delete dataset error for %s", kb.ID)
		}

		return nil
	})
}

func validateDatasetChunkMethod(chunkMethod string) error {
	if _, ok := datasetAllowedChunkMethods[chunkMethod]; !ok {
		return errors.New(datasetChunkMethodErrorMessage)
	}
	return nil
}

func validateDatasetAvatar(avatar string) error {
	if !strings.Contains(avatar, ",") {
		return errors.New("Missing MIME prefix. Expected format: data:<mime>;base64,<data>")
	}

	prefix, _, _ := strings.Cut(avatar, ",")
	if !strings.HasPrefix(prefix, "data:") {
		return errors.New("Invalid MIME prefix format. Must start with 'data:'")
	}

	mimeType, _, _ := strings.Cut(strings.TrimPrefix(prefix, "data:"), ";")
	if _, ok := datasetSupportedAvatarMIMETypes[mimeType]; !ok {
		return errors.New("Unsupported MIME type. Allowed: [image/jpeg image/png]")
	}

	return nil
}

func validateDatasetEmbeddingModel(embeddingModel string) error {
	if embeddingModel == "" {
		return errors.New("Embedding model identifier must follow <model_name>@<provider> format")
	}

	modelName, provider, ok := strings.Cut(embeddingModel, "@")
	if !ok {
		return errors.New("Embedding model identifier must follow <model_name>@<provider> format")
	}
	if strings.TrimSpace(modelName) == "" || strings.TrimSpace(provider) == "" {
		return errors.New("Both model_name and provider must be non-empty strings")
	}

	return nil
}

func normalizeDatasetPipelineID(pipelineID string) (*string, error) {
	pipelineID = strings.TrimSpace(pipelineID)
	if pipelineID == "" {
		return nil, nil
	}
	if len(pipelineID) != 32 {
		return nil, errors.New("pipeline_id must be 32 hex characters")
	}
	for _, char := range pipelineID {
		if !strings.ContainsRune("0123456789abcdefABCDEF", char) {
			return nil, errors.New("pipeline_id must be hexadecimal")
		}
	}

	normalized := strings.ToLower(pipelineID)
	return &normalized, nil
}

func validateDatasetParserConfigSize(parserConfig map[string]interface{}) error {
	if len(parserConfig) == 0 {
		return nil
	}

	data, err := json.Marshal(parserConfig)
	if err != nil {
		return errors.New("parser_config must be valid JSON")
	}
	if len(data) > 65535 {
		return fmt.Errorf("Parser config exceeds size limit (max 65,535 characters). Current size: %d", len(data))
	}

	return nil
}

// normalizeDatasetID canonicalizes an id into the 32-char hex form used by
// the storage layer. The "UUID1" name was a legacy term from when the
// Python service generated ids with `uuid.uuid1().hex`; the Go port uses
// `uuid.New()` (v4), so we accept any RFC 4122 version. We only reject the
// Nil UUID, which is the reserved "no id" sentinel.
func normalizeDatasetID(id string) (string, error) {
	parsedUUID, err := uuid.Parse(id)
	if err != nil {
		return "", errors.New("Invalid UUID format")
	}
	if parsedUUID == (uuid.UUID{}) {
		return "", errors.New("Invalid UUID format")
	}
	return strings.ReplaceAll(parsedUUID.String(), "-", ""), nil
}

func (s *DatasetService) verifyEmbeddingAvailability(embdID string, tenantID string) (bool, string) {
	_, _, _, _, err := NewModelProviderService().GetModelConfigFromProviderInstance(tenantID, entity.ModelTypeEmbedding, embdID)
	if err != nil {
		return false, err.Error()
	}
	return true, ""
}

func applyAutoMetadataConfig(parserConfig map[string]interface{}, config *AutoMetadataConfig) map[string]interface{} {
	if parserConfig == nil {
		parserConfig = make(map[string]interface{})
	}

	fields := make([]map[string]interface{}, 0, len(config.Fields))
	for _, field := range config.Fields {
		fields = append(fields, map[string]interface{}{
			"name":            field.Name,
			"type":            field.Type,
			"description":     field.Description,
			"examples":        field.Examples,
			"restrict_values": field.RestrictValues,
		})
	}
	parserConfig["metadata"] = fields
	enableMetadata := true
	if config.Enabled != nil {
		enableMetadata = *config.Enabled
	}
	parserConfig["enable_metadata"] = enableMetadata
	return parserConfig
}

func parserConfigValueOrEmptyList(parserConfig map[string]interface{}, key string) interface{} {
	if parserConfig == nil {
		return []interface{}{}
	}

	value, ok := parserConfig[key]
	if !ok || value == nil {
		return []interface{}{}
	}

	return value
}

func normalizeMetadataConfigFields(fields []MetadataConfigField, fieldName string) ([]map[string]interface{}, error) {
	normalizedFields := make([]map[string]interface{}, 0, len(fields))
	for i, field := range fields {
		key := strings.TrimSpace(field.Key)
		if key == "" {
			return nil, fmt.Errorf("%s[%d].key is required", fieldName, i)
		}
		if len(key) > 255 {
			return nil, fmt.Errorf("%s[%d].key should have at most 255 characters", fieldName, i)
		}

		fieldType := strings.TrimSpace(field.Type)
		if _, ok := datasetAllowedMetadataTypes[fieldType]; !ok {
			return nil, fmt.Errorf("%s[%d].type should be one of 'string', 'list', 'time' or 'number'", fieldName, i)
		}

		if field.Description != nil && len(*field.Description) > 65535 {
			return nil, fmt.Errorf("%s[%d].description should have at most 65535 characters", fieldName, i)
		}

		normalizedFields = append(normalizedFields, map[string]interface{}{
			"key":         key,
			"type":        fieldType,
			"description": field.Description,
			"enum":        field.Enum,
		})
	}

	return normalizedFields, nil
}

func datasetListItemToMap(kb *entity.KnowledgebaseListItem) map[string]interface{} {
	item := map[string]interface{}{
		"id":              kb.ID,
		"name":            kb.Name,
		"tenant_id":       kb.TenantID,
		"permission":      kb.Permission,
		"document_count":  kb.DocNum,
		"token_num":       kb.TokenNum,
		"chunk_count":     kb.ChunkNum,
		"chunk_method":    kb.ParserID,
		"embedding_model": kb.EmbdID,
		"nickname":        kb.Nickname,
	}

	if kb.Avatar != nil {
		item["avatar"] = *kb.Avatar
	}
	if kb.Language != nil {
		item["language"] = *kb.Language
	}
	if kb.Description != nil {
		item["description"] = *kb.Description
	}
	if kb.TenantAvatar != nil {
		item["tenant_avatar"] = *kb.TenantAvatar
	}
	if kb.UpdateTime != nil {
		item["update_time"] = *kb.UpdateTime
	}

	return item
}

func datasetToMap(kb *entity.Knowledgebase) map[string]interface{} {
	item := map[string]interface{}{
		"id":                       kb.ID,
		"tenant_id":                kb.TenantID,
		"name":                     kb.Name,
		"embedding_model":          kb.EmbdID,
		"permission":               kb.Permission,
		"created_by":               kb.CreatedBy,
		"document_count":           kb.DocNum,
		"token_num":                kb.TokenNum,
		"chunk_count":              kb.ChunkNum,
		"similarity_threshold":     kb.SimilarityThreshold,
		"vector_similarity_weight": kb.VectorSimilarityWeight,
		"chunk_method":             kb.ParserID,
		"parser_config":            kb.ParserConfig,
		"pagerank":                 kb.Pagerank,
		"create_time":              kb.CreateTime,
	}

	if kb.Avatar != nil {
		item["avatar"] = *kb.Avatar
	}
	if kb.Language != nil {
		item["language"] = *kb.Language
	}
	if kb.Description != nil {
		item["description"] = *kb.Description
	}
	if kb.PipelineID != nil {
		item["pipeline_id"] = *kb.PipelineID
	}
	if kb.GraphragTaskID != nil {
		item["graphrag_task_id"] = *kb.GraphragTaskID
	}
	if kb.GraphragTaskFinishAt != nil {
		item["graphrag_task_finish_at"] = kb.GraphragTaskFinishAt.Format("2006-01-02 15:04:05")
	}
	if kb.RaptorTaskID != nil {
		item["raptor_task_id"] = *kb.RaptorTaskID
	}
	if kb.RaptorTaskFinishAt != nil {
		item["raptor_task_finish_at"] = kb.RaptorTaskFinishAt.Format("2006-01-02 15:04:05")
	}
	if kb.MindmapTaskID != nil {
		item["mindmap_task_id"] = *kb.MindmapTaskID
	}
	if kb.MindmapTaskFinishAt != nil {
		item["mindmap_task_finish_at"] = kb.MindmapTaskFinishAt.Format("2006-01-02 15:04:05")
	}
	if kb.UpdateTime != nil {
		item["update_time"] = *kb.UpdateTime
	}

	return item
}

func limitStrings(values []string, limit int) []string {
	if len(values) <= limit {
		return values
	}
	return values[:limit]
}

func (s *DatasetService) RenameTag(datasetID, userID, fromTag, toTag string) (map[string]interface{}, common.ErrorCode, error) {
	fromTag = strings.TrimSpace(fromTag)
	toTag = strings.TrimSpace(toTag)

	datasetID, err := normalizeDatasetID(datasetID)
	if err != nil {
		return nil, common.CodeDataError, err
	}
	if strings.TrimSpace(datasetID) == "" {
		return nil, common.CodeDataError, errors.New("Lack of \"Dataset ID\"")
	}
	if !s.kbDAO.Accessible(datasetID, userID) {
		return nil, common.CodeDataError, errors.New("No authorization.")
	}
	if s.docEngine == nil {
		return nil, common.CodeServerError, errors.New("Document engine is not initialized")
	}

	kb, err := s.kbDAO.GetByID(datasetID)
	if err != nil || kb == nil {
		return nil, common.CodeDataError, errors.New("Invalid Dataset ID")
	}
	indexName := fmt.Sprintf("ragflow_%s", kb.TenantID)

	condition := map[string]interface{}{
		"tag_kwd": fromTag,
		"kb_id":   datasetID,
	}
	newValue := map[string]interface{}{
		"remove": map[string]interface{}{
			"tag_kwd": fromTag,
		},
		"add": map[string]interface{}{
			"tag_kwd": toTag,
		},
	}

	err = s.docEngine.UpdateChunks(context.Background(), condition, newValue, indexName, datasetID)
	if err != nil {
		return nil, common.CodeServerError, fmt.Errorf("failed to rename tag: %w", err)
	}

	return map[string]interface{}{
		"from": fromTag,
		"to":   toTag,
	}, common.CodeSuccess, nil
}
