package partial

import (
	"crypto/sha1"
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/pkg/errors"
	"io"
	"io/ioutil"
	"mime"
	"mime/multipart"
	"os"
	"path"
	"strconv"
	"time"

	"git.qianqiusoft.com/qianqiusoft/light-apiengine/entitys"
	syslogs "git.qianqiusoft.com/qianqiusoft/light-apiengine/logs"
	sysmodel "git.qianqiusoft.com/qianqiusoft/light-apiengine/models"
	sysutils "git.qianqiusoft.com/qianqiusoft/light-apiengine/utils"
)

/**
 * 附件上传/下载接口
 */
type AttachementUpDownloader interface {
	/**
	 * @brief: 附件上传接口
	 * @param1 file: post 多媒体file
	 * @param2 fileHeader: 文件相关头部信息
	 * @return1: 附件信息，主要包括id，url， hash和大小。其他字段会自动设置
	 * @return4: 错误信息
	 */
	Upload(multipart.File, *multipart.FileHeader)(*sysmodel.SysAttachment, error)
	/**
	 * @brief: 附件下载
	 * @param1 ctx: 上下文
	 * @param2 attach: 福建对象
	 */
	Download(*entitys.CtrlContext, *sysmodel.SysAttachment)
}

// 附件上传下载接口
var _attachementUpDownloader AttachementUpDownloader = &defaultAttachUpDownloader{}

/**
 * @brief: 设置附件上传下载接口
 * @param1 uder: 上传下载接口
 */
func SetAttachementUpDownloader(uder AttachementUpDownloader){
	if uder != nil{
		_attachementUpDownloader = uder
	}
}

// _Upload
// @Title _Upload
// @Description 上传文件
// @Success 200 {object} Account
// @Failure 403 :id is empty
func SysAttachment_Upload(c *entitys.CtrlContext) {
	attach, err := doUpload2(c)
	if err == nil {
		c.Ctx.JSON(200, sysmodel.SysReturn{200, "", attach.Id})
		syslogs.Debug("上传附件成功:", attach.Name, attach.Size)
	} else {
		c.Ctx.JSON(500, sysmodel.SysReturn{500, err.Error(), nil})
	}
}

// _Download
// @Title _Download
// @Description 下载文件
// @Param	id    string  false  "文件ID"
// @Success 200 {object} Account
// @Failure 403 :id is empty
func SysAttachment_Download(c *entitys.CtrlContext) {
	attachId := c.Ctx.Query("id")

	var engine = c.PlatformDbEngine
	var attach sysmodel.SysAttachment
	has, err := engine.ID(attachId).Get(&attach)
	if err != nil || !has {
		syslogs.Error("获取附件出错了:", err)
		c.Ctx.JSON(500, sysmodel.SysReturn{500, "获取附件出错了", nil})
		return
	}

	if _attachementUpDownloader != nil{
		_attachementUpDownloader.Download(c, &attach)
	}else{
		c.Ctx.JSON(500, gin.H{"code": 500, "msg": "附件上传下载接口为nil", "data": nil})
	}
}

// _Delete
// @Title _Delete
// @Description 删除文件
// @Param	id    string  false  "文件ID"
// @Success 200 {object} Account
// @Failure 403 :id is empty
func SysAttachment_Delete(c *entitys.CtrlContext) {
	attrId := c.Ctx.Query("id")
	attach := &sysmodel.SysAttachment{}
	attach.Id = attrId
	_, err := c.PlatformDbEngine.ID(attrId).Delete(attach)
	if err != nil {
		syslogs.Error("删除附件出错了:", err)
		c.Ctx.JSON(500, sysmodel.SysReturn{500, err.Error(), nil})
		return
	}
	syslogs.Debug("删除附件:", attrId)
	c.Ctx.JSON(200, sysmodel.SysReturn{200, "", attrId})
}

// _Get
// @Title _Get
// @Description 获取附件信息
// @Param	id    string  false  "附件id"
// @Success 200 {object} Account
// @Failure 403 :id is empty
func SysAttachment_Get(c *entitys.CtrlContext) {
	var id = c.Ctx.Query("id")
	var attach sysmodel.SysAttachment
	has, err := c.PlatformDbEngine.ID(id).Get(&attach)
	if err == nil {
		if has {
			c.Ctx.JSON(200, sysmodel.SysReturn{200, "", attach})
		} else {
			c.Ctx.JSON(200, sysmodel.SysReturn{500, "附件不存在", nil})
		}
	} else {
		c.Ctx.JSON(200, sysmodel.SysReturn{500, err.Error(), nil})
	}
}

func doUpload(c *entitys.CtrlContext) (*sysmodel.SysAttachment, error) {
	file, fInfo, err := c.Ctx.Request.FormFile("file")
	if err != nil {
		syslogs.Error("上传出错了:", err)
		return nil, err
	}
	download, hash, length, err := sysutils.PostFile(file)
	if err != nil {
		return nil, err
	}
	userId := c.Ctx.GetString("user_id")

	attach := &sysmodel.SysAttachment{}
	attach.Id = sysutils.NewUUID()
	attach.Name = fInfo.Filename
	attach.Size = length
	attach.Url = download
	attach.CreateBy = userId
	attach.CreateTime = time.Now()
	attach.Ext = path.Ext(attach.Name)
	attach.Hash = hash

	_, err = c.Db.InsertOne(attach)
	if err != nil {
		syslogs.Error("保存附件出错了:", err)
		return nil, err
	}

	return attach, nil
}

func doUpload2(c *entitys.CtrlContext) (*sysmodel.SysAttachment, error) {
	file, fInfo, err := c.Ctx.Request.FormFile("file")
	if err != nil {
		syslogs.Error("上传出错了:", err)
		return nil, err
	}
	defer file.Close()

	var attach *sysmodel.SysAttachment = nil
	if _attachementUpDownloader != nil{
		attach, err = _attachementUpDownloader.Upload(file, fInfo)
		if err !=nil{
			return nil, err
		}
	}else{
		return nil, errors.New("附件上传下载接口为nil")
	}

	userId := c.Ctx.GetString("user_id")

	if attach.Id == ""{
		attach.Id = sysutils.NewUUID()
	}
	if attach.Size <= 0{
		attach.Size = int32((fInfo.Size))
	}
	attach.Name = fInfo.Filename
	attach.CreateBy = userId
	attach.CreateTime = time.Now()
	attach.Ext = path.Ext(attach.Name)

	_, err = c.PlatformDbEngine.InsertOne(attach)
	if err != nil {
		syslogs.Error("保存附件出错了:", err)
		return nil, err
	}

	return attach, nil
}

func mkdir(dir string) error {
	_, err := os.Stat(dir)
	if err != nil {
		err = os.MkdirAll(dir, os.ModePerm)
	}
	return err
}

func FileHasH(filePath string) string {
	bytes, err := ioutil.ReadFile(filePath)
	if err == nil && len(bytes) > 0 {
		return fmt.Sprintf("%x", sha1.Sum(bytes))
	}
	return ""
}

/**
 * @brief: 默认
 */
type defaultAttachUpDownloader struct{
}


/**
 * @brief: 附件上传接口
 * @param1 file: post 多媒体file
 * @param1 header: 文件相头信息
 * @return1: 附件信息，主要包括id，url， hash和大小。其他字段会自动设置
 * @return2: 错误信息
 */
func(d *defaultAttachUpDownloader)Upload(file multipart.File, header *multipart.FileHeader)(*sysmodel.SysAttachment, error){
	fileDir := fmt.Sprintf("files/")
	if err := mkdir(fileDir); err != nil {
		syslogs.Info("文件夹创建失败")
		return nil, err
	}
	attachId := sysutils.NewUUID()
	filePath := fileDir + attachId
	fW, err := os.Create(filePath)
	if err != nil {
		syslogs.Info("文件创建失败")
		return nil, err
	}
	defer fW.Close()
	length, err := io.Copy(fW, file)
	if err != nil {
		syslogs.Info("文件保存失败")
		return nil, err
	}

	attach := &sysmodel.SysAttachment{}
	attach.Id = attachId
	attach.Url = "/api/v1/sys_attachment/download?id=" + attach.Id
	attach.Hash = ""
	attach.Size = int32(length)

	return attach, nil
}

/**
 * @brief: 附件下载
 * @param1 ctx: 上下文
 * @param2 id: 附件记录的id
 */
func(d *defaultAttachUpDownloader)Download(c *entitys.CtrlContext, attach *sysmodel.SysAttachment){
	filePath := "files/" + attach.Id

	c.Ctx.Writer.Header().Add("Content-Disposition", "attachment;filename=\""+sysutils.FormatForBrowse(c.Ctx.Request.UserAgent(), attach.Name)+"\"")
	c.Ctx.Writer.Header().Add("Content-Type", mime.TypeByExtension(attach.Ext))
	c.Ctx.Writer.Header().Add("Content-Length", strconv.FormatInt(int64(attach.Size), 10))
	c.Ctx.Writer.Header().Add("Accept-Ranges", "bytes")

	if !sysutils.Exists(filePath) {
		c.Ctx.Writer.WriteHeader(400)
		return
	}
	fmt.Println("---->", c.Ctx.Writer.Header().Get("Content-Disposition"))
	fmt.Println("---->", c.Ctx.Writer.Header().Get("Content-Type"))
	fmt.Println("---->", c.Ctx.Writer.Header().Get("Content-Length"))
	fmt.Println("---->", c.Ctx.Writer.Header().Get("Accept-Ranges"))

	c.Ctx.File(filePath)
}

func __none_func_sys_attachment__(params ...interface{}) bool {
	return true
}