package model

import (
	"fmt"
	"moredoc/util"
	"moredoc/util/converter"
	"os"
	"path/filepath"
	"strings"
	"time"

	"go.uber.org/zap"
	"golang.org/x/net/html"
	"gorm.io/gorm"
)

const (
	// 封面，按照A4纸的尺寸比例
	DocumentCoverWidth  = 210
	DocumentCoverHeight = 297
)

const (
	DocumentStatusPending    = iota // 待转换
	DocumentStatusConverting        // 转换中
	DocumentStatusConverted         // 已转换
	DocumentStatusFailed            // 转换失败
	DocumentStatusDisabled          // 已禁用
	DocumentStatusRePending         // 重新等待转换
)

var DocumentStatusMap = map[int]struct{}{
	DocumentStatusPending:    {},
	DocumentStatusConverting: {},
	DocumentStatusConverted:  {},
	DocumentStatusFailed:     {},
	DocumentStatusDisabled:   {},
}

type Document struct {
	Id            int64           `form:"id" json:"id,omitempty" gorm:"primaryKey;autoIncrement;column:id;comment:;"`
	Title         string          `form:"title" json:"title,omitempty" gorm:"column:title;type:varchar(255);size:255;comment:文档名称;"`
	Keywords      string          `form:"keywords" json:"keywords,omitempty" gorm:"column:keywords;type:varchar(255);size:255;comment:文档关键字;"`
	Description   string          `form:"description" json:"description,omitempty" gorm:"column:description;type:varchar(255);size:255;comment:文档描述;"`
	UserId        int64           `form:"user_id" json:"user_id,omitempty" gorm:"column:user_id;type:bigint(20);size:20;default:0;index:user_id;comment:文档所属用户ID;"`
	Width         int             `form:"width" json:"width,omitempty" gorm:"column:width;type:int(11);size:11;default:0;comment:宽;"`
	Height        int             `form:"height" json:"height,omitempty" gorm:"column:height;type:int(11);size:11;default:0;comment:高;"`
	Preview       int             `form:"preview" json:"preview,omitempty" gorm:"column:preview;type:int(11);size:11;default:0;comment:允许预览页数;"`
	Pages         int             `form:"pages" json:"pages,omitempty" gorm:"column:pages;type:int(11);size:11;default:0;comment:文档页数;index:idx_pages;"`
	DownloadCount int             `form:"download_count" json:"download_count,omitempty" gorm:"column:download_count;type:int(11);size:11;default:0;comment:下载人次;index:idx_download_count;"`
	ViewCount     int             `form:"view_count" json:"view_count,omitempty" gorm:"column:view_count;type:int(11);size:11;default:0;comment:浏览人次;index:idx_view_count;"`
	FavoriteCount int             `form:"favorite_count" json:"favorite_count,omitempty" gorm:"column:favorite_count;type:int(11);size:11;default:0;comment:收藏人次;index:idx_favorite_count;"`
	CommentCount  int             `form:"comment_count" json:"comment_count,omitempty" gorm:"column:comment_count;type:int(11);size:11;default:0;comment:评论人次;"`
	Score         int             `form:"score" json:"score,omitempty" gorm:"column:score;type:int(11);size:11;default:300;comment:评分，3位整数表示，500表示5分;"`
	ScoreCount    int             `form:"score_count" json:"score_count,omitempty" gorm:"column:score_count;type:int(11);size:11;default:0;comment:评分数量;"`
	Price         int             `form:"price" json:"price,omitempty" gorm:"column:price;type:int(11);size:11;default:0;comment:价格，0表示免费;index:idx_price;"`
	Size          int64           `form:"size" json:"size,omitempty" gorm:"column:size;type:bigint(20);size:20;default:0;comment:文件大小;"`
	Ext           string          `form:"ext" json:"ext,omitempty" gorm:"column:ext;type:varchar(16);size:16;index:idx_ext;comment:文件扩展名"`
	Status        int             `form:"status" json:"status,omitempty" gorm:"column:status;type:smallint(6);size:6;default:0;index:status;comment:文档状态：0 待转换，1 转换中，2 转换完成，3 转换失败，4 禁用;"`
	CreatedAt     *time.Time      `form:"created_at" json:"created_at,omitempty" gorm:"column:created_at;type:datetime;comment:创建时间;"`
	UpdatedAt     *time.Time      `form:"updated_at" json:"updated_at,omitempty" gorm:"column:updated_at;type:datetime;comment:更新时间;"`
	DeletedAt     *gorm.DeletedAt `form:"deleted_at" json:"deleted_at,omitempty" gorm:"column:deleted_at;type:datetime;index:idx_deleted_at;comment:删除时间;"`
	DeletedUserId int64           `form:"deleted_user_id" json:"deleted_user_id,omitempty" gorm:"column:deleted_user_id;type:bigint(20);size:20;default:0;comment:删除用户ID;"`
	EnableGZIP    bool            `form:"enable_gzip" json:"enable_gzip,omitempty" gorm:"column:enable_gzip;type:tinyint(1);size:1;default:0;comment:是否启用GZIP压缩;"`
	RecommendAt   *time.Time      `form:"recommend_at" json:"recommend_at,omitempty" gorm:"column:recommend_at;type:datetime;comment:推荐时间;index:idx_recommend_at;"`
	PreviewExt    string          `form:"preview_ext" json:"preview_ext,omitempty" gorm:"column:preview_ext;type:varchar(16);size:16;default:.svg;comment:预览图扩展名;"`
}

func (Document) TableName() string {
	return tablePrefix + "document"
}

// UpdateDocument 更新Document，如果需要更新指定字段，则请指定updateFields参数
func (m *DBModel) UpdateDocument(document *Document, categoryId []int64, updateFields ...string) (err error) {
	sess := m.db.Begin()
	defer func() {
		if err != nil {
			sess.Rollback()
		} else {
			sess.Commit()
		}
	}()

	var (
		oldDocCategories      []DocumentCategory
		oldDocCategoryIds     []int64
		newDocCategories      []DocumentCategory
		modelDocumentCategory = &DocumentCategory{}
		modelCategory         = &Category{}
	)

	sess.Table(modelDocumentCategory.TableName()).Select("category_id").Where("document_id = ?", document.Id).Find(&oldDocCategories)
	for _, cate := range oldDocCategories {
		oldDocCategoryIds = append(oldDocCategoryIds, cate.CategoryId)
	}

	if len(oldDocCategoryIds) > 0 {
		err = sess.Where("document_id = ?", document.Id).Delete(modelDocumentCategory).Error
		if err != nil {
			m.logger.Error("Delete DocumentCategory", zap.Error(err))
			return
		}

		// 更新分类统计
		err = sess.Model(modelCategory).Where("id in (?)", oldDocCategoryIds).Update("doc_count", gorm.Expr("doc_count - ?", 1)).Error
		if err != nil {
			m.logger.Error("Update doc_count--", zap.Error(err))
			return
		}
	}

	for _, cateId := range categoryId {
		newDocCategories = append(newDocCategories, DocumentCategory{
			DocumentId: document.Id,
			CategoryId: cateId,
		})
	}
	if len(newDocCategories) > 0 {
		m.logger.Debug("newDocCategories", zap.Any("newDocCategories", newDocCategories))
		err = sess.Create(&newDocCategories).Error
		if err != nil {
			m.logger.Error("Create New Category", zap.Error(err))
			return
		}

		err = sess.Model(modelCategory).Where("id in (?)", categoryId).Update("doc_count", gorm.Expr("doc_count + ?", 1)).Error
		if err != nil {
			m.logger.Error("Update doc_count++", zap.Error(err))
			return
		}
	}

	updateFields = m.FilterValidFields(Document{}.TableName(), updateFields...)
	if len(updateFields) > 0 { // 更新指定字段
		sess = sess.Select(updateFields)
	} else {
		sess = sess.Select(m.GetTableFields(document.TableName())).Omit("deleted_at", "deleted_user_id")
	}

	err = sess.Where("id = ?", document.Id).Updates(document).Error
	if err != nil {
		m.logger.Error("UpdateDocument", zap.Error(err))
		return
	}

	return
}

func (m *DBModel) SetDocumentReconvert() (err error) {
	err = m.db.Model(&Document{}).
		Where("status = ?", DocumentStatusFailed).
		Update("status", DocumentStatusPending).Error
	if err != nil {
		m.logger.Error("SetDocumentReconvert", zap.Error(err))
	}
	return
}

func (m *DBModel) UpdateDocumentField(id int64, fieldValue map[string]interface{}) (err error) {
	err = m.db.Model(&Document{}).Where("id = ?", id).Updates(fieldValue).Error
	if err != nil {
		m.logger.Error("UpdateDocumentField", zap.Error(err))
		return
	}
	return
}

// GetDocument 根据id获取Document
func (m *DBModel) GetDocument(id interface{}, fields ...string) (document Document, err error) {
	db := m.db

	fields = m.FilterValidFields(Document{}.TableName(), fields...)
	if len(fields) > 0 {
		db = db.Select(fields)
	}

	err = db.Where("id = ?", id).First(&document).Error
	return
}

type OptionGetDocumentList struct {
	Page         int
	Size         int
	WithCount    bool                      // 是否返回总数
	Ids          []interface{}             // id列表
	SelectFields []string                  // 查询字段
	QueryRange   map[string][2]interface{} // map[field][]{min,max}
	QueryIn      map[string][]interface{}  // map[field][]{value1,value2,...}
	QueryLike    map[string][]interface{}  // map[field][]{value1,value2,...}
	Sort         []string
	IsRecycle    bool // 是否是回收站模式查询
	IsRecommend  []bool
	FeeType      string // 费用类型：free免费，charge收费
}

// GetDocumentList 获取Document列表
func (m *DBModel) GetDocumentList(opt *OptionGetDocumentList) (documentList []Document, total int64, err error) {
	tableDocument := Document{}.TableName() + " d"
	db := m.db.Unscoped().Table(tableDocument)
	if opt.IsRecycle {
		// 回收站模式，只根据删除的倒序排序
		opt.Sort = []string{"d.deleted_at desc"}
		db = db.Where("d.deleted_at IS NOT NULL")
	} else {
		db = db.Where("d.deleted_at IS NULL")
	}

	m.logger.Debug("GetDocumentList", zap.Any("opt", opt))

	db = m.generateQueryIn(db, tableDocument, opt.QueryIn)
	db = m.generateQueryLike(db, tableDocument, opt.QueryLike)
	db = m.generateQueryRange(db, tableDocument, opt.QueryRange)
	if len(opt.Ids) > 0 {
		db = db.Where("id in (?)", opt.Ids)
	}

	if categoryIds, ok := opt.QueryIn["category_id"]; ok && len(categoryIds) > 0 {
		tableCategory := DocumentCategory{}.TableName()
		db = db.Joins("left join "+tableCategory+" dc on dc.document_id = d.id").Where("dc.category_id in (?)", categoryIds)
	}

	if l := len(opt.IsRecommend); l == 1 {
		if opt.IsRecommend[0] {
			db = db.Where("d.`recommend_at` IS NOT NULL")
		} else {
			db = db.Where("d.`recommend_at` IS NULL")
		}
	}

	if opt.FeeType != "" {
		switch opt.FeeType {
		case "free":
			db = db.Where("d.`price` = ?", 0)
		case "charge":
			db = db.Where("d.`price` > ?", 0)
		}
	}

	if opt.WithCount {
		err = db.Group("d.id").Count(&total).Error
		if err != nil {
			m.logger.Error("GetDocumentList", zap.Error(err))
			return
		}
	}

	opt.SelectFields = m.FilterValidFields(tableDocument, opt.SelectFields...)
	if len(opt.SelectFields) > 0 {
		db = db.Select(opt.SelectFields)
	} else {
		db = db.Select(m.GetTableFields(tableDocument))
	}

	if len(opt.Sort) > 0 {
		db = m.generateQuerySort(db, tableDocument, opt.Sort)
	} else {
		db = db.Order("d.id desc")
	}

	db = db.Offset((opt.Page - 1) * opt.Size).Limit(opt.Size)
	err = db.Group("d.id").Find(&documentList).Error
	if err != nil && err != gorm.ErrRecordNotFound {
		m.logger.Error("GetDocumentList", zap.Error(err))
	}
	return
}

// DeleteDocument 删除数据
func (m *DBModel) DeleteDocument(ids []int64, deletedUserId int64, deepDelete ...bool) (err error) {
	var (
		docs                  []Document
		docCates              []DocumentCategory
		docFields             = []string{"id", "status", "user_id", "deleted_at", "deleted_user_id", "title"}
		docCateFields         = []string{"id", "document_id", "category_id"}
		modelUser             = &User{}
		modelDocument         = &Document{}
		modelDocumentCategory = &DocumentCategory{}
		modelCategory         = &Category{}
		docCateMap            = make(map[int64][]int64)
	)

	// 1. 查询文档信息
	m.db.Model(modelDocument).Select(docFields).Unscoped().Where("id in (?)", ids).Find(&docs)
	m.db.Model(modelDocumentCategory).Select(docCateFields).Where("document_id in (?)", ids).Find(&docCates)

	for _, docCate := range docCates {
		docCateMap[docCate.DocumentId] = append(docCateMap[docCate.DocumentId], docCate.CategoryId)
	}

	cfgScore := m.GetConfigOfScore(ConfigScoreDeleteDocument, ConfigScoreCreditName)

	sess := m.db.Begin()
	defer func() {
		if err != nil {
			sess.Rollback()
		} else {
			sess.Commit()
		}
	}()

	if len(deepDelete) > 0 && deepDelete[0] { // 标记附件为删除状态
		err = sess.Where("type = ? and type_id in (?)", AttachmentTypeDocument, ids).Delete(&Attachment{}).Error
		if err != nil {
			m.logger.Error("DeleteDocument", zap.Error(err))
			return
		}
	}

	for _, doc := range docs {
		if doc.DeletedAt == nil {
			err = sess.Model(modelUser).Where("id = ?", doc.UserId).Update("doc_count", gorm.Expr("doc_count - ?", 1)).Error
			if err != nil {
				m.logger.Error("DeleteDocument", zap.Error(err))
				return
			}

			if cateIds, ok := docCateMap[doc.Id]; ok && len(cateIds) > 0 {
				err = sess.Model(modelCategory).Where("id in (?)", cateIds).Update("doc_count", gorm.Expr("doc_count - ?", 1)).Error
				if err != nil {
					m.logger.Error("DeleteDocument", zap.Error(err))
					return
				}
			}
		}

		if len(deepDelete) > 0 && deepDelete[0] { // 彻底删除
			err = sess.Unscoped().Delete(&doc).Error
			if err != nil {
				m.logger.Error("DeleteDocument", zap.Error(err))
				return
			}

			// 关联的分类也需要删除
			err = sess.Unscoped().Where("document_id = ?", doc.Id).Delete(modelDocumentCategory).Error
			if err != nil {
				m.logger.Error("DeleteDocument", zap.Error(err))
				return
			}
			continue
		}

		// 逻辑删除
		err = sess.Model(&doc).Where("id = ?", doc.Id).Updates(map[string]interface{}{
			"deleted_at":      time.Now(),
			"deleted_user_id": deletedUserId,
		}).Error
		if err != nil {
			m.logger.Error("DeleteDocument", zap.Error(err))
			return
		}

		// 扣除积分和添加动态
		dynamic := &Dynamic{
			UserId:  doc.UserId,
			Type:    DynamicTypeDeleteDocument,
			Content: fmt.Sprintf("删除了文档《%s》", doc.Title),
		}

		if cfgScore.DeleteDocument != 0 { // 小于0表示扣除积分
			score := cfgScore.DeleteDocument
			if score < 0 {
				score = -score
			}
			dynamic.Content += fmt.Sprintf("，扣除了 %d %s", score, cfgScore.CreditName)
			err = sess.Model(modelUser).Where("id = ?", doc.UserId).Update("credit_count", gorm.Expr("credit_count - ?", score)).Error
			if err != nil {
				m.logger.Error("DeleteDocument", zap.Error(err))
				return
			}
		}

		err = sess.Create(dynamic).Error
		if err != nil {
			m.logger.Error("DeleteDocument", zap.Error(err))
			return
		}

		if err != nil {
			m.logger.Error("DeleteDocument", zap.Error(err))
			return
		}
	}

	return
}

// RecoverRecycleDocument 恢复回收站中的文档
func (m *DBModel) RecoverRecycleDocument(documentId []int64) (err error) {
	var (
		modelDocument      = &Document{}
		modelCategory      = &Category{}
		modelUser          = &User{}
		documentCategories []DocumentCategory
		docs               []Document
	)

	m.db.Select([]string{"category_id"}).Where("document_id in (?)", documentId).Find(&documentCategories)
	m.db.Select("user_id").Unscoped().Where("id in (?)", documentId).Find(&docs)

	sess := m.db.Begin()
	defer func() {
		if err != nil {
			sess.Rollback()
		} else {
			sess.Commit()
		}
	}()

	err = sess.Model(modelDocument).Unscoped().Where("id in ?", documentId).Updates(map[string]interface{}{
		"deleted_at":      nil,
		"deleted_user_id": 0,
	}).Error

	if err != nil {
		m.logger.Error("RecoverRecycleDocument", zap.Error(err))
		return
	}

	for _, docCate := range documentCategories {
		err = sess.Model(modelCategory).Where("id = ?", docCate.CategoryId).Update("doc_count", gorm.Expr("doc_count + ?", 1)).Error
		if err != nil {
			m.logger.Error("RecoverRecycleDocument", zap.Error(err))
			return
		}
	}

	for _, doc := range docs {
		err = sess.Model(modelUser).Where("id = ?", doc.UserId).Update("doc_count", gorm.Expr("doc_count + ?", 1)).Error
		if err != nil {
			m.logger.Error("RecoverRecycleDocument", zap.Error(err))
			return
		}
	}

	return
}

func (m *DBModel) ClearRecycleDocument() (err error) {
	var docs []Document
	err = m.db.Unscoped().Select("id").Where("deleted_at is not null").Find(&docs).Error
	if err != nil && err != gorm.ErrRecordNotFound {
		m.logger.Error("ClearRecycleDocument", zap.Error(err))
		return
	}

	if len(docs) == 0 {
		err = nil
		return
	}

	var ids []int64
	for _, doc := range docs {
		ids = append(ids, doc.Id)
	}

	err = m.DeleteDocument(ids, 0, true)
	if err != nil {
		m.logger.Error("DeleteDocument", zap.Error(err))
	}

	return
}

// 批量创建文档
func (m *DBModel) CreateDocuments(documents []Document, categoryIds []int64) (docs []Document, err error) {
	sess := m.db.Begin()
	defer func() {
		if err != nil {
			sess.Rollback()
		} else {
			sess.Commit()
		}
	}()

	docCount := len(documents)

	// 1. 分类下的文档数增加
	err = sess.Model(&Category{}).
		Where("id in ?", categoryIds).
		Update("doc_count", gorm.Expr("doc_count + ?", docCount)).Error
	if err != nil {
		m.logger.Error("CreateDocuments", zap.Error(err))
		return
	}

	// 2. 批量创建文档
	err = sess.Create(documents).Error
	if err != nil {
		m.logger.Error("CreateDocuments", zap.Error(err))
		return
	}
	docs = documents

	// 3. 文档与分类关联
	var docCates []DocumentCategory
	for _, doc := range documents {
		for _, cateId := range categoryIds {
			docCates = append(docCates, DocumentCategory{
				DocumentId: doc.Id,
				CategoryId: cateId,
			})
		}
	}
	err = sess.Create(docCates).Error
	if err != nil {
		m.logger.Error("CreateDocuments", zap.Error(err))
		return
	}

	// 用户文档数增加
	err = sess.Model(&User{}).Where("id = ?", documents[0].UserId).Update("doc_count", gorm.Expr("doc_count + ?", docCount)).Error
	if err != nil {
		m.logger.Error("CreateDocuments", zap.Error(err))
		return
	}

	// 奖励的数量
	awardCount := docCount
	cfg := m.GetConfigOfScore()
	m.logger.Debug("CreateDocuments", zap.Any("GetConfigOfScore", cfg))
	if cfg.UploadDocumentLimit > 0 {
		var todayUploadCount int64
		sess.Model(&Document{}).Where("user_id = ? and created_at >= ?", documents[0].UserId, time.Now().Format("2006-01-02")).Count(&todayUploadCount)

		// 默认获得的积分奖励
		creditCount := cfg.UploadDocument * int32(docCount)
		if todayUploadCount > int64(cfg.UploadDocumentLimit) {
			awardCount = int(cfg.UploadDocumentLimit + int32(docCount) - int32(todayUploadCount))
			creditCount = cfg.UploadDocument * int32(awardCount)
		}
		m.logger.Debug("CreateDocuments", zap.Int32("creditCount", creditCount))
		if creditCount > 0 {
			err = sess.Model(&User{}).Where("id = ?", documents[0].UserId).Update("credit_count", gorm.Expr("credit_count + ?", creditCount)).Error
			if err != nil {
				m.logger.Error("CreateDocuments", zap.Error(err))
				return
			}
		}
	}

	// 添加动态
	var dynamics []Dynamic
	for idx, doc := range documents {
		var award int32
		if idx < awardCount {
			award = cfg.UploadDocument
		}
		content := fmt.Sprintf(`上传了文档《<a href="/document/%d">%s</a>》`, doc.Id, html.EscapeString(doc.Title))
		if award > 0 {
			content += fmt.Sprintf(`，获得了 %d %s奖励`, award, m.GetCreditName())
		}
		dynamics = append(dynamics, Dynamic{
			UserId:  doc.UserId,
			Type:    DynamicTypeUpload,
			Content: content,
		})
	}
	err = sess.Create(dynamics).Error
	if err != nil {
		m.logger.Error("CreateDocuments", zap.Error(err))
		return
	}
	return
}

// GetDocumentStatusConvertedByHash 根据文档hash，查询已转换了的文档状态
func (m *DBModel) GetDocumentStatusConvertedByHash(hash []string) (hashMapDocuments map[string]Document) {
	var (
		tableDocument   = Document{}.TableName()
		tableAttachment = Attachment{}.TableName()
		attachMapIndex  = make(map[int64]int)
		documentIds     []int64
		docs            []Document
	)

	hashMapDocuments = make(map[string]Document)
	sql := fmt.Sprintf(
		"select a.hash,a.type_id from %s a left join %s d on a.type_id = d.id where a.hash in ? and d.status = ? group by a.hash",
		tableAttachment, tableDocument,
	)

	var attachemnts []Attachment
	err := m.db.Raw(sql, hash, DocumentStatusConverted).Find(&attachemnts).Error
	if err != nil {
		m.logger.Error("GetDocumentStatusConvertedByHash", zap.Error(err))
		return
	}

	for idx, attachment := range attachemnts {
		attachMapIndex[attachment.TypeId] = idx
		documentIds = append(documentIds, attachment.TypeId)
	}

	if len(documentIds) == 0 {
		return
	}

	m.db.Where("id in ?", documentIds).Find(&docs)
	for _, doc := range docs {
		hashMapDocuments[attachemnts[attachMapIndex[doc.Id]].Hash] = doc
	}
	return
}

// ConvertDocument 文档转换。如果err返回gorm.ErrRecordNotFound，表示已没有文档需要转换
// 1. 查询待转换的文档
// 2. 文档对应的md5 hash中，是否有已转换的文档，如果有，则直接关联和调整状态为已转换
// 3. 文档转PDF
// 4. PDF截取第一章图片作为封面
// 5. 根据允许最大的预览页面，将PDF转为svg，同时转gzip压缩，如果有需要的话
// 6. 提取PDF文本以及获取文档信息
// 7. 更新文档状态
func (m *DBModel) ConvertDocument() (err error) {
	var document Document
	err = m.db.Where("status in ?", []int{DocumentStatusPending, DocumentStatusRePending}).First(&document).Error
	if err != nil {
		if err != gorm.ErrRecordNotFound {
			m.logger.Error("ConvertDocument", zap.Error(err))
		}
		return
	}
	defer func() {
		m.SetDocumentConvertError(document.Id, err)
	}()
	// 文档转为PDF
	cfg := m.GetConfigOfConverter()
	m.SetDocumentStatus(document.Id, DocumentStatusConverting)

	attachment := m.GetAttachmentByTypeAndTypeId(AttachmentTypeDocument, document.Id)
	if attachment.Id == 0 { // 附件不存在
		m.SetDocumentStatus(document.Id, DocumentStatusFailed)
		if err != nil {
			m.logger.Error("ConvertDocument", zap.Error(err))
		}
		return
	}

	localFile := strings.TrimLeft(attachment.Path, "./")
	baseDir := strings.TrimSuffix(localFile, filepath.Ext(localFile))
	cover := baseDir + "/cover.png"

	if !cfg.EnableConvertRepeatedDocument && document.Status != DocumentStatusRePending {
		_, errCover := os.Stat(cover)
		hashMapDocs := m.GetDocumentStatusConvertedByHash([]string{attachment.Hash}) // 文档hash
		if len(hashMapDocs) > 0 && errCover == nil {                                 // 双重确认文档是否已转换成功：1. 存在相同hash的已转换的文档，2. 存在封面图片
			m.logger.Info("ConvertDocument", zap.Bool("EnableConvertRepeatedDocument", cfg.EnableConvertRepeatedDocument), zap.String("hash", attachment.Hash), zap.Any("hashMapDocs", hashMapDocs))
			// 已有文档转换成功，将hash相同的文档相关数据迁移到当前文档
			sql := " UPDATE `%s` SET `description`= ? , `enable_gzip` = ?, `width` = ?, `height`= ?, `preview`= ?, `pages` = ?, `status` = ? WHERE status in ? and id in (select type_id from `%s` where `hash` = ? and `type` = ?)"
			sql = fmt.Sprintf(sql, Document{}.TableName(), Attachment{}.TableName())
			for hash, doc := range hashMapDocs {
				err = m.db.Exec(sql,
					doc.Description, doc.EnableGZIP, doc.Width, doc.Height, doc.Preview, doc.Pages, DocumentStatusConverted, []int{DocumentStatusPending, DocumentStatusConverting, DocumentStatusFailed}, hash, AttachmentTypeDocument,
				).Error
				if err != nil {
					m.logger.Error("ConvertDocument", zap.Error(err))
					return
				}
			}
			return
		}
	}

	timeout := 30 * time.Minute
	if cfg.Timeout > 0 {
		timeout = time.Duration(cfg.Timeout) * time.Minute
	}

	cvt := converter.NewConverter(m.logger, timeout)
	defer cvt.Clean() // 清除缓存目录
	dstPDF, err := cvt.ConvertToPDF(localFile)
	if err != nil {
		m.SetDocumentStatus(document.Id, DocumentStatusFailed)
		m.logger.Error("ConvertDocument", zap.Error(err))
		return
	}
	document.Pages, _ = cvt.CountPDFPages(dstPDF)
	document.Preview = cfg.MaxPreview
	if document.Pages < cfg.MaxPreview {
		document.Preview = document.Pages
	}

	// PDF截取第一章图片作为封面(封面不是最重要的，期间出现错误，不影响文档转换)
	pages, err := cvt.ConvertPDFToPNG(dstPDF, 1, 1)
	if err != nil {
		m.logger.Error("get pdf cover", zap.Error(err))
	}

	if len(pages) > 0 {
		coverBig := baseDir + "/cover.big.png"
		util.CopyFile(pages[0].PagePath, coverBig)
		util.CopyFile(pages[0].PagePath, cover)
		util.CropImage(cover, DocumentCoverWidth, DocumentCoverHeight)
		document.Width, document.Height, _ = util.GetImageSize(coverBig) // 页面宽高
	}

	// PDF转为SVG
	toPage := document.Pages
	if cfg.MaxPreview > 0 {
		toPage = cfg.MaxPreview
	}
	if toPage > document.Pages {
		toPage = document.Pages
	}

	pages, err = cvt.ConvertPDFToPages(dstPDF, 1, toPage, &converter.OptionConvertPages{
		EnableSVGO: cfg.EnableSVGO,
		EnableGZIP: cfg.EnableGZIP,
		Extension:  cfg.Extension,
	})
	if err != nil {
		m.SetDocumentStatus(document.Id, DocumentStatusFailed)
		m.logger.Error("ConvertDocument", zap.Error(err))
		return
	}

	ext := "." + cfg.Extension
	if ext == ".svg" && cfg.EnableGZIP {
		ext = ".gzip.svg"
	}

	for _, page := range pages {
		dst := fmt.Sprintf(baseDir+"/%d%s", page.PageNum, ext)
		m.logger.Debug("ConvertDocument CopyFile", zap.String("src", page.PagePath), zap.String("dst", dst))
		errCopy := util.CopyFile(page.PagePath, dst)
		if errCopy != nil {
			m.logger.Error("ConvertDocument CopyFile", zap.Error(errCopy))
		}
	}

	// 提取PDF文本以及获取文档信息
	textFile, _ := cvt.ConvertPDFToTxt(dstPDF)
	util.CopyFile(textFile, baseDir+"/content.txt")

	// 读取文本内容，以提取关键字和摘要
	if content, errRead := os.ReadFile(textFile); errRead == nil {
		contentStr := string(content)
		replacer := strings.NewReplacer("\r", " ", "\n", " ", "\t", " ")
		document.Description = strings.TrimSpace(replacer.Replace(util.Substr(contentStr, 255)))
	}

	document.Status = DocumentStatusConverted
	document.EnableGZIP = cfg.EnableGZIP
	document.PreviewExt = strings.TrimPrefix(ext, ".gzip")
	err = m.db.Select("description", "cover", "width", "height", "preview", "pages", "status", "enable_gzip", "preview_ext").Where("id = ?", document.Id).Updates(document).Error
	if err != nil {
		m.SetDocumentStatus(document.Id, DocumentStatusFailed)
		m.logger.Error("ConvertDocument", zap.Error(err))
	}
	return
}

func (m *DBModel) SetDocumentStatus(documentId int64, status int) (err error) {
	err = m.db.Model(&Document{}).Where("id = ?", documentId).Update("status", status).Error
	if err != nil {
		m.logger.Error("SetDocumentStatus", zap.Error(err))
	}
	return
}

// 设置文章推荐状态
func (m *DBModel) SetDocumentRecommend(documentIds []int64, typ int32) (err error) {
	db := m.db.Model(&Document{}).Where("id in (?)", documentIds)
	switch typ {
	case 0: // 取消推荐
		err = db.Update("recommend_at", nil).Error
	case 1: // 推荐
		err = db.Where("recommend_at IS NULL").Update("recommend_at", time.Now()).Error
	case 2: // 置顶
		err = db.Update("recommend_at", time.Now()).Error
	}
	if err != nil {
		m.logger.Error("SetDocumentRecommend", zap.Error(err))
	}
	return
}

func (m *DBModel) CountDocument(status ...int) (count int64, err error) {
	db := m.db.Model(&Document{})
	if len(status) > 0 {
		db = db.Where("status in (?)", status)
	}
	err = db.Count(&count).Error
	if err != nil {
		m.logger.Error("CountDocument", zap.Error(err))
	}
	return
}

func (m *DBModel) SetDocumentsCategory(documentId, categoryId []int64) (err error) {
	tx := m.db.Begin()
	defer func() {
		if err != nil {
			tx.Rollback()
		} else {
			tx.Commit()
		}
	}()

	for _, id := range documentId {
		// 1. 旧的文档分类，减少计数
		var docCates []DocumentCategory
		m.db.Model(&DocumentCategory{}).Where("document_id = ?", id).Find(&docCates)
		for _, cate := range docCates {
			err = tx.Model(&Category{}).Where("id = ?", cate.CategoryId).Update("doc_count", gorm.Expr("doc_count - ?", 1)).Error
			if err != nil {
				m.logger.Error("SetDocumentsCategory", zap.Error(err))
				return
			}
		}

		// 2. 删除旧的分类
		err = tx.Model(&DocumentCategory{}).Where("document_id = ?", id).Delete(&DocumentCategory{}).Error
		if err != nil {
			m.logger.Error("SetDocumentsCategory", zap.Error(err))
			return
		}

		// 3. 添加新的分类
		docCates = []DocumentCategory{}
		for _, cid := range categoryId {
			docCates = append(docCates, DocumentCategory{
				DocumentId: id,
				CategoryId: cid,
			})
		}
		err = tx.Create(&docCates).Error
		if err != nil {
			m.logger.Error("SetDocumentsCategory", zap.Error(err))
			return
		}

		// 4. 更新文档分类统计
		err = tx.Model(&Category{}).Where("id in (?)", categoryId).Update("doc_count", gorm.Expr("doc_count + ?", 1)).Error
		if err != nil {
			m.logger.Error("SetDocumentsCategory", zap.Error(err))
			return
		}
	}
	return
}