package models

import (
	"bytes"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/PuerkitoBio/goquery"
	"github.com/astaxie/beego"
	"github.com/astaxie/beego/logs"
	"github.com/astaxie/beego/orm"
	"github.com/lifei6671/mindoc/conf"
	"github.com/lifei6671/mindoc/converter"
	"github.com/lifei6671/mindoc/utils/filetil"
	"github.com/lifei6671/mindoc/utils/ziptil"
	"gopkg.in/russross/blackfriday.v2"
	"regexp"
	"github.com/lifei6671/mindoc/utils/cryptil"
	"github.com/lifei6671/mindoc/utils/requests"
	"github.com/lifei6671/mindoc/utils/gopool"
	"encoding/base64"
	"net/http"
)

var(
	exportLimitWorkerChannel = gopool.NewChannelPool(conf.GetExportLimitNum(),conf.GetExportQueueLimitNum())
)

type BookResult struct {
	BookId         int       `json:"book_id"`
	BookName       string    `json:"book_name"`
	Identify       string    `json:"identify"`
	OrderIndex     int       `json:"order_index"`
	Description    string    `json:"description"`
	Publisher      string    `json:"publisher"`
	PrivatelyOwned int       `json:"privately_owned"`
	PrivateToken   string    `json:"private_token"`
	DocCount       int       `json:"doc_count"`
	CommentStatus  string    `json:"comment_status"`
	CommentCount   int       `json:"comment_count"`
	CreateTime     time.Time `json:"create_time"`
	CreateName     string    `json:"create_name"`
	RealName       string    `json:"real_name"`
	ModifyTime     time.Time `json:"modify_time"`
	Cover          string    `json:"cover"`
	Theme          string    `json:"theme"`
	Label          string    `json:"label"`
	MemberId       int       `json:"member_id"`
	Editor         string    `json:"editor"`
	AutoRelease    bool      `json:"auto_release"`
	HistoryCount   int       `json:"history_count"`

	RelationshipId     int    `json:"relationship_id"`
	RoleId             int    `json:"role_id"`
	RoleName           string `json:"role_name"`
	Status             int    `json:"status"`
	IsEnableShare      bool   `json:"is_enable_share"`
	IsUseFirstDocument bool   `json:"is_use_first_document"`

	LastModifyText   string `json:"last_modify_text"`
	IsDisplayComment bool   `json:"is_display_comment"`
	IsDownload       bool   `json:"is_download"`
}

func NewBookResult() *BookResult {
	return &BookResult{}
}

// 根据项目标识查询项目以及指定用户权限的信息.
func (m *BookResult) FindByIdentify(identify string, memberId int) (*BookResult, error) {
	if identify == "" || memberId <= 0 {
		return m, ErrInvalidParameter
	}
	o := orm.NewOrm()

	book := NewBook()

	err := o.QueryTable(book.TableNameWithPrefix()).Filter("identify", identify).One(book)

	if err != nil {
		return m, err
	}

	relationship := NewRelationship()

	err = o.QueryTable(relationship.TableNameWithPrefix()).Filter("book_id", book.BookId).Filter("member_id", memberId).One(relationship)

	if err != nil {
		return m, err
	}
	var relationship2 Relationship

	err = o.QueryTable(relationship.TableNameWithPrefix()).Filter("book_id", book.BookId).Filter("role_id", 0).One(&relationship2)

	if err != nil {
		logs.Error("根据项目标识查询项目以及指定用户权限的信息 => ", err)
		return m, ErrPermissionDenied
	}

	member, err := NewMember().Find(relationship2.MemberId)
	if err != nil {
		return m, err
	}

	m = NewBookResult().ToBookResult(*book)

	m.CreateName = member.Account
	if member.RealName != "" {
		m.RealName = member.RealName
	}
	m.MemberId = relationship.MemberId
	m.RoleId = relationship.RoleId
	m.RelationshipId = relationship.RelationshipId

	if m.RoleId == conf.BookFounder {
		m.RoleName = "创始人"
	} else if m.RoleId == conf.BookAdmin {
		m.RoleName = "管理员"
	} else if m.RoleId == conf.BookEditor {
		m.RoleName = "编辑者"
	} else if m.RoleId == conf.BookObserver {
		m.RoleName = "观察者"
	}

	doc := NewDocument()

	err = o.QueryTable(doc.TableNameWithPrefix()).Filter("book_id", book.BookId).OrderBy("modify_time").One(doc)

	if err == nil {
		member2 := NewMember()
		member2.Find(doc.ModifyAt)

		m.LastModifyText = member2.Account + " 于 " + doc.ModifyTime.Local().Format("2006-01-02 15:04:05")
	}

	return m, nil
}

func (m *BookResult) FindToPager(pageIndex, pageSize int) (books []*BookResult, totalCount int, err error) {
	o := orm.NewOrm()

	count, err := o.QueryTable(NewBook().TableNameWithPrefix()).Count()

	if err != nil {
		return
	}
	totalCount = int(count)

	sql := `SELECT
			book.*,rel.relationship_id,rel.role_id,m.account AS create_name,m.real_name
		FROM md_books AS book
			LEFT JOIN md_relationship AS rel ON rel.book_id = book.book_id AND rel.role_id = 0
			LEFT JOIN md_members AS m ON rel.member_id = m.member_id
		ORDER BY book.order_index DESC ,book.book_id DESC  LIMIT ?,?`

	offset := (pageIndex - 1) * pageSize

	_, err = o.Raw(sql, offset, pageSize).QueryRows(&books)

	return
}

//实体转换
func (m *BookResult) ToBookResult(book Book) *BookResult {

	m.BookId = book.BookId
	m.BookName = book.BookName
	m.Identify = book.Identify
	m.OrderIndex = book.OrderIndex
	m.Description = strings.Replace(book.Description, "\r\n", "<br/>", -1)
	m.PrivatelyOwned = book.PrivatelyOwned
	m.PrivateToken = book.PrivateToken
	m.DocCount = book.DocCount
	m.CommentStatus = book.CommentStatus
	m.CommentCount = book.CommentCount
	m.CreateTime = book.CreateTime
	m.ModifyTime = book.ModifyTime
	m.Cover = book.Cover
	m.Label = book.Label
	m.Status = book.Status
	m.Editor = book.Editor
	m.Theme = book.Theme
	m.AutoRelease = book.AutoRelease == 1
	m.IsEnableShare = book.IsEnableShare == 0
	m.IsUseFirstDocument = book.IsUseFirstDocument == 1
	m.Publisher = book.Publisher
	m.HistoryCount = book.HistoryCount
	m.IsDownload = book.IsDownload == 0

	if book.Theme == "" {
		m.Theme = "default"
	}
	if book.Editor == "" {
		m.Editor = "markdown"
	}

	doc := NewDocument()

	o := orm.NewOrm()

	err := o.QueryTable(doc.TableNameWithPrefix()).Filter("book_id", book.BookId).OrderBy("modify_time").One(doc)

	if err == nil {
		member2 := NewMember()
		member2.Find(doc.ModifyAt)

		m.LastModifyText = member2.Account + " 于 " + doc.ModifyTime.Local().Format("2006-01-02 15:04:05")
	}

	return m
}

//后台转换
func BackgroupConvert(sessionId string,bookResult *BookResult) error {

	if err := converter.CheckConvertCommand(); err != nil {
		beego.Error("检查转换程序失败 -> ",err)
		return err
	}
	err := exportLimitWorkerChannel.LoadOrStore(bookResult.Identify, func() {
		bookResult.Converter(sessionId)
	})

	if err != nil {

		beego.Error("将导出任务加入任务队列失败 -> ",err)
		return err
	}
	exportLimitWorkerChannel.Start()
	return nil
}

//导出PDF、word等格式
func (m *BookResult) Converter(sessionId string) (ConvertBookResult, error) {

	convertBookResult := ConvertBookResult{}

	outputPath := filepath.Join(conf.GetExportOutputPath(), strconv.Itoa(m.BookId))
	viewPath := beego.BConfig.WebConfig.ViewsPath

	pdfpath := filepath.Join(outputPath, "book.pdf")
	epubpath := filepath.Join(outputPath, "book.epub")
	mobipath := filepath.Join(outputPath, "book.mobi")
	docxpath := filepath.Join(outputPath, "book.docx")

	//先将转换的文件储存到临时目录
	tempOutputPath := filepath.Join(os.TempDir(), sessionId, m.Identify,"source") //filepath.Abs(filepath.Join("cache", sessionId))

	if err := os.MkdirAll(outputPath, 0766); err != nil {
		beego.Error("创建目录失败 => ",outputPath,err)
	}
	if err := os.MkdirAll(tempOutputPath, 0766);err != nil {
		beego.Error("创建目录失败 => ",tempOutputPath,err)
	}

	//defer os.RemoveAll(strings.TrimSuffix(tempOutputPath,"source"))
	sourceDir := strings.TrimSuffix(tempOutputPath,"source");

	if filetil.FileExists(sourceDir) {
		if err := os.MkdirAll(sourceDir,0755); err != nil {
			beego.Error("删除临时目录失败 ->", sourceDir , err)
		}
	}

	if filetil.FileExists(pdfpath) && filetil.FileExists(epubpath) && filetil.FileExists(mobipath) && filetil.FileExists(docxpath) {
		convertBookResult.EpubPath = epubpath
		convertBookResult.MobiPath = mobipath
		convertBookResult.PDFPath = pdfpath
		convertBookResult.WordPath = docxpath
		return convertBookResult, nil
	}

	docs, err := NewDocument().FindListByBookId(m.BookId)
	if err != nil {
		return convertBookResult, err
	}

	tocList := make([]converter.Toc, 0)

	for _, item := range docs {
		if item.ParentId == 0 {
			toc := converter.Toc{
				Id:    item.DocumentId,
				Link:  strconv.Itoa(item.DocumentId) + ".html",
				Pid:   item.ParentId,
				Title: item.DocumentName,
			}

			tocList = append(tocList, toc)
		}
	}
	for _, item := range docs {
		if item.ParentId != 0 {
			toc := converter.Toc{
				Id:    item.DocumentId,
				Link:  strconv.Itoa(item.DocumentId) + ".html",
				Pid:   item.ParentId,
				Title: item.DocumentName,
			}
			tocList = append(tocList, toc)
		}
	}

	ebookConfig := converter.Config{
		Charset:      "utf-8",
		Cover:        m.Cover,
		Timestamp:    time.Now().Format("2006-01-02 15:04:05"),
		Description:  string(blackfriday.Run([]byte(m.Description))),
		Footer:       "<p style='color:#8E8E8E;font-size:12px;'>本文档使用 <a href='https://www.iminho.me' style='text-decoration:none;color:#1abc9c;font-weight:bold;'>MinDoc</a> 构建 <span style='float:right'>- _PAGENUM_ -</span></p>",
		Header:       "<p style='color:#8E8E8E;font-size:12px;'>_SECTION_</p>",
		Identifier:   "",
		Language:     "zh-CN",
		Creator:      m.CreateName,
		Publisher:    m.Publisher,
		Contributor:  m.Publisher,
		Title:        m.BookName,
		Format:       []string{"epub", "mobi", "pdf", "docx"},
		FontSize:     "14",
		PaperSize:    "a4",
		MarginLeft:   "72",
		MarginRight:  "72",
		MarginTop:    "72",
		MarginBottom: "72",
		Toc:          tocList,
		More:         []string{},
	}
	if m.Publisher != "" {
		ebookConfig.Footer = "<p style='color:#8E8E8E;font-size:12px;'>本文档由 <span style='text-decoration:none;color:#1abc9c;font-weight:bold;'>" + m.Publisher + "</span> 生成<span style='float:right'>- _PAGENUM_ -</span></p>"
	}
	if m.RealName != "" {
		ebookConfig.Creator = m.RealName
	}

	if tempOutputPath, err = filepath.Abs(tempOutputPath); err != nil {
		beego.Error("导出目录配置错误：" + err.Error())
		return convertBookResult, err
	}

	for _, item := range docs {
		name := strconv.Itoa(item.DocumentId)
		fpath := filepath.Join(tempOutputPath, name+".html")

		f, err := os.OpenFile(fpath, os.O_CREATE|os.O_RDWR, 0777)
		if err != nil {
			return convertBookResult, err
		}
		var buf bytes.Buffer

		if err := beego.ExecuteViewPathTemplate(&buf, "document/export.tpl", viewPath, map[string]interface{}{"Model": m, "Lists": item, "BaseUrl": conf.BaseUrl}); err != nil {
			return convertBookResult, err
		}
		html := buf.String()

		if err != nil {

			f.Close()
			return convertBookResult, err
		}

		bufio := bytes.NewReader(buf.Bytes())

		doc, err := goquery.NewDocumentFromReader(bufio)
		doc.Find("img").Each(func(i int, contentSelection *goquery.Selection) {
			if src, ok := contentSelection.Attr("src"); ok {
				var encodeString string

				//如果是本地路径则直接读取文件内容
				if strings.HasPrefix(src, "/") {
					spath := filepath.Join(conf.WorkingDirectory, src)

					if ff, e := ioutil.ReadFile(spath); e == nil {
						encodeString = base64.StdEncoding.EncodeToString(ff)
					}
				}else{
					client := &http.Client{}
					if req,err := http.NewRequest("GET",src,nil); err == nil {
						req.Header.Set("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36")
						req.Header.Set("Referer",src)
						//10秒连接超时时间
						client.Timeout = time.Second * 10

						if resp ,err := client.Do(req);err == nil {

							defer resp.Body.Close()

							if body, err := ioutil.ReadAll(resp.Body);err == nil {
								encodeString = base64.StdEncoding.EncodeToString(body)
							}
						}
					}
				}
				if encodeString != "" {
					src = "data:image/" + strings.TrimPrefix(filepath.Ext(src),".") + ";base64," + encodeString

					contentSelection.SetAttr("src", src)
				}
			}
		})

		html, err = doc.Html()
		if err != nil {
			f.Close()
			return convertBookResult, err
		}
		f.WriteString(html)
		f.Close()
	}

	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "css", "kancloud.css"), filepath.Join(tempOutputPath, "styles", "css", "kancloud.css")); err != nil {
		beego.Error("复制CSS样式出错 => static/css/kancloud.css",err)
	}
	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "css", "export.css"), filepath.Join(tempOutputPath, "styles", "css", "export.css"));err != nil {
		beego.Error("复制CSS样式出错 => static/css/export.css",err)
	}
	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "editor.md", "css", "editormd.preview.css"), filepath.Join(tempOutputPath, "styles", "editor.md", "css", "editormd.preview.css"));err != nil {
		beego.Error("复制CSS样式出错 => static/editor.md/css/editormd.preview.css",err)
	}
	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "prettify", "themes", "prettify.css"), filepath.Join(tempOutputPath, "styles", "prettify", "themes", "prettify.css")); err != nil {
		beego.Error("复制CSS样式出错 => static/prettify/themes/prettify.css",err)
	}
	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "css", "markdown.preview.css"), filepath.Join(tempOutputPath, "styles", "css", "markdown.preview.css"));err != nil {
		beego.Error("复制CSS样式出错 => static/css/markdown.preview.css",err)
	}
	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "highlight", "styles", "vs.css"), filepath.Join(tempOutputPath, "styles", "highlight", "styles", "vs.css")); err != nil {
		beego.Error("复制CSS样式出错 => static/highlight/styles/vs.css",err)
	}
	if err := filetil.CopyFile(filepath.Join(conf.WorkingDirectory, "static", "katex", "katex.min.css"), filepath.Join(tempOutputPath, "styles", "katex", "katex.min.css")); err != nil {
		beego.Error("复制CSS样式出错 => static/katex/katex.min.css",err)
	}

	eBookConverter := &converter.Converter{
		BasePath:   tempOutputPath,
		OutputPath: filepath.Join(strings.TrimSuffix(tempOutputPath, "source"),"output"),
		Config:     ebookConfig,
		Debug:      true,
		ProcessNum: conf.GetExportProcessNum(),
	}

	os.MkdirAll(eBookConverter.OutputPath,0766)

	if err := eBookConverter.Convert(); err != nil {
		beego.Error("转换文件错误：" + m.BookName + " => " + err.Error())
		return convertBookResult, err
	}
	beego.Info("文档转换完成：" + m.BookName)

	if err := filetil.CopyFile(filepath.Join(eBookConverter.OutputPath,"output", "book.mobi"),mobipath,);err != nil {
		beego.Error("复制文档失败 => ",filepath.Join(eBookConverter.OutputPath,"output", "book.mobi"),err)
	}
	if err := filetil.CopyFile(filepath.Join(eBookConverter.OutputPath,"output", "book.pdf"),pdfpath);err != nil {
		beego.Error("复制文档失败 => ",filepath.Join(eBookConverter.OutputPath,"output", "book.pdf"),err)
	}
	if err := filetil.CopyFile(filepath.Join(eBookConverter.OutputPath,"output", "book.epub"),epubpath); err != nil{
		beego.Error("复制文档失败 => ",filepath.Join(eBookConverter.OutputPath,"output", "book.epub"),err)
	}
	if err := filetil.CopyFile(filepath.Join(eBookConverter.OutputPath,"output", "book.docx"),docxpath); err != nil {
		beego.Error("复制文档失败 => ",filepath.Join(eBookConverter.OutputPath,"output", "book.docx"),err)
	}

	convertBookResult.MobiPath = mobipath
	convertBookResult.PDFPath = pdfpath
	convertBookResult.EpubPath = epubpath
	convertBookResult.WordPath = docxpath

	return convertBookResult, nil
}

//导出Markdown原始文件
func (m *BookResult) ExportMarkdown(sessionId string) (string, error) {
	outputPath := filepath.Join(conf.WorkingDirectory, "uploads", "books", strconv.Itoa(m.BookId), "book.zip")

	os.MkdirAll(filepath.Dir(outputPath), 0644)

	tempOutputPath := filepath.Join(os.TempDir(), sessionId, "markdown")

	defer os.RemoveAll(tempOutputPath)

	bookUrl := conf.URLFor("DocumentController.Index",":key" , m.Identify) + "/"

	err := exportMarkdown(tempOutputPath, 0, m.BookId,tempOutputPath,bookUrl)

	if err != nil {
		return "", err
	}


	if err := ziptil.Compress(outputPath, tempOutputPath); err != nil {
		beego.Error("导出Markdown失败=>", err)
		return "", err
	}
	return outputPath, nil
}

//递归导出Markdown文档
func exportMarkdown(p string, parentId int, bookId int,baseDir string,bookUrl string) error {
	o := orm.NewOrm()

	var docs []*Document

	_, err := o.QueryTable(NewDocument().TableNameWithPrefix()).Filter("book_id", bookId).Filter("parent_id", parentId).All(&docs)

	if err != nil {
		beego.Error("导出Markdown失败=>", err)
		return err
	}
	for _, doc := range docs {
		//获取当前文档的子文档数量，如果数量不为0，则将当前文档命名为READMD.md并设置成目录。
		subDocCount, err := o.QueryTable(NewDocument().TableNameWithPrefix()).Filter("parent_id", doc.DocumentId).Count()

		if err != nil {
			beego.Error("导出Markdown失败=>", err)
			return err
		}

		var docPath string

		if subDocCount > 0 {
			if doc.Identify != "" {
				docPath = filepath.Join(p, doc.Identify, "README.md")
			} else {
				docPath = filepath.Join(p, strconv.Itoa(doc.DocumentId), "README.md")
			}
		} else {
			if doc.Identify != "" {
				if strings.HasSuffix(doc.Identify,".md") || strings.HasSuffix(doc.Identify,".markdown") {
					docPath = filepath.Join(p, doc.Identify)
				}else {
					docPath = filepath.Join(p, doc.Identify+".md")
				}
			} else {
				docPath = filepath.Join(p, strings.TrimSpace(doc.DocumentName)+".md")
			}
		}
		dirPath := filepath.Dir(docPath)

		os.MkdirAll(dirPath, 0766)
		markdown := doc.Markdown
		//如果当前文档不为空
		if strings.TrimSpace(doc.Markdown) != "" {
			re := regexp.MustCompile(`!\[(.*?)\]\((.*?)\)`)

			//处理文档中图片
			markdown = re.ReplaceAllStringFunc(doc.Markdown, func(image string) string {
				images := re.FindAllSubmatch([]byte(image), -1)
				if len(images) <= 0 || len(images[0]) < 3 {
					return image
				}
				originalImageUrl := string(images[0][2])
				imageUrl := strings.Replace(string(originalImageUrl), "\\", "/", -1)

				//如果是本地路径，则需要将图片复制到项目目录
				if strings.HasPrefix(imageUrl, "http://") || strings.HasPrefix(imageUrl, "https://") {
					imageExt := cryptil.Md5Crypt(imageUrl) + filepath.Ext(imageUrl)

					dstFile := filepath.Join(baseDir, "uploads", time.Now().Format("200601"), imageExt)

					if err := requests.DownloadAndSaveFile(imageUrl, dstFile); err == nil {
						imageUrl = strings.TrimPrefix(strings.Replace(dstFile, "\\", "/", -1), strings.Replace(baseDir, "\\", "/", -1))
						if !strings.HasPrefix(imageUrl, "/") && !strings.HasPrefix(imageUrl, "\\") {
							imageUrl = "/" + imageUrl
						}
					}
				} else if strings.HasPrefix(imageUrl, "/") {
					filetil.CopyFile(filepath.Join(conf.WorkingDirectory, imageUrl), filepath.Join(baseDir, imageUrl))
				}

				imageUrl = strings.Replace(strings.TrimSuffix(image, originalImageUrl+")")+imageUrl+")", "\\", "/", -1)

				return imageUrl
			})

			linkRe := regexp.MustCompile(`\[(.*?)\]\((.*?)\)`)

			markdown = linkRe.ReplaceAllStringFunc(markdown, func(link string) string {
				links := linkRe.FindAllStringSubmatch(link, -1)
				if len(links) > 0 && len(links[0]) >= 3 {
					originalLink := links[0][2]

					//如果当前链接位于当前项目内
					if strings.HasPrefix(originalLink,bookUrl) {
						docIdentify := strings.TrimSpace(strings.TrimPrefix(originalLink, bookUrl))
						tempDoc := NewDocument()
						if id,err := strconv.Atoi(docIdentify);err == nil && id > 0 {
							err := o.QueryTable(NewDocument().TableNameWithPrefix()).Filter("document_id",id).One(tempDoc,"identify","parent_id","document_id")
							if err != nil {
								beego.Error(err)
								return link
							}
						}else{
							err := o.QueryTable(NewDocument().TableNameWithPrefix()).Filter("identify",docIdentify).One(tempDoc,"identify","parent_id","document_id")
							if err != nil {
								beego.Error(err)
								return link
							}
						}
						tempLink := recursiveJoinDocumentIdentify(tempDoc.ParentId,"") + strings.TrimPrefix(originalLink, bookUrl)

						if !strings.HasSuffix(tempLink,".md") && !strings.HasSuffix(doc.Identify,".markdown") {
							tempLink = tempLink + ".md"
						}
						relative := strings.TrimPrefix(strings.Replace(p,"\\","/",-1),strings.Replace(baseDir,"\\","/",-1))
						repeat := 0
						if relative != "" {
							relative = strings.TrimSuffix(strings.TrimPrefix(relative,"/"),"/")
							repeat = strings.Count(relative,"/") + 1
						}
						beego.Info(repeat,"|",relative,"|",p,"|",baseDir)
						tempLink = strings.Repeat("../",repeat) + tempLink

						link = strings.TrimSuffix(link, originalLink+")") + tempLink + ")"
					}
				}

				return link

			})
		}else{
			markdown = "# " + doc.DocumentName + "\n"
		}
		if err := ioutil.WriteFile(docPath, []byte(markdown), 0644); err != nil {
			beego.Error("导出Markdown失败=>", err)
			return err
		}

		if subDocCount > 0 {
			if err = exportMarkdown(dirPath, doc.DocumentId, bookId,baseDir,bookUrl); err != nil {
				return err
			}
		}
	}
	return nil
}

func recursiveJoinDocumentIdentify(parentDocId int,identify string) string {
	o := orm.NewOrm()

	doc := NewDocument()

	err := o.QueryTable(NewDocument().TableNameWithPrefix()).Filter("document_id",parentDocId).One(doc,"identify","parent_id","document_id")

	if err != nil {
		beego.Error(err)
		return identify
	}

	if doc.Identify == "" {
		identify = strconv.Itoa(doc.DocumentId) + "/" + identify
	}else{
		identify = doc.Identify + "/" + identify
	}
	if doc.ParentId > 0 {
		identify = recursiveJoinDocumentIdentify(doc.ParentId,identify)
	}
	return identify
}

//查询项目的第一篇文档
func (m *BookResult) FindFirstDocumentByBookId(bookId int) (*Document, error) {

	o := orm.NewOrm()

	doc := NewDocument()

	err := o.QueryTable(doc.TableNameWithPrefix()).Filter("book_id", bookId).Filter("parent_id", 0).OrderBy("order_sort").One(doc)

	return doc, err
}