package task

import (
	"crypto/md5"
	"encoding/hex"
	"errors"
	"go.uber.org/zap"
	"gorm.io/gorm"
	"io"
	"log-server/global"
	"log-server/model/task/response"
	"log-server/utils"
	"mime/multipart"
	"os"
	"path"
	"strings"
	"time"
)

type UploadFileService struct {

}

func (e *UploadFileService) Upload(file response.UploadFileResponse) error {
	return global.GVA_DB.Table("upload_file").Create(&file).Error
}

//更改的上传文件函数
func (e *UploadFileService) UploadFileFunc(file *multipart.FileHeader) (string, string, string, error) {
	// 读取文件后缀
	ext := path.Ext(file.Filename)
	// 读取文件名并加密
	name := strings.TrimSuffix(file.Filename, ext)
	name = utils.MD5V([]byte(name))
	// 拼接新文件名
	filename := name + "_" + time.Now().Format("20060102150405") + ext
	// 尝试创建此路径
	mkdirErr := os.MkdirAll(global.GVA_CONFIG.Local.StorePath, os.ModePerm)
	if mkdirErr != nil {
		global.GVA_LOG.Error("function os.MkdirAll() Filed", zap.Any("err", mkdirErr.Error()))
		return "", "", "", errors.New("function os.MkdirAll() Filed, err:" + mkdirErr.Error())
	}
	// 拼接路径和文件名
	p := global.GVA_CONFIG.Local.StorePath + "/" + filename
	filepath := global.GVA_CONFIG.Local.Path + "/" + filename

	f, openError := file.Open() // 读取文件
	f1, openErr := file.Open()	//	读取文件生成MD5值
	if openError != nil || openErr != nil {
		global.GVA_LOG.Error("function file.Open() Filed", zap.Any("err", openError.Error()))
		return "", "", "", errors.New("function file.Open() Filed, err:" + openError.Error())
	}
	defer f.Close() // 创建文件 defer 关闭
	defer f1.Close()
	//生成md5值
	md5h := md5.New()
	io.Copy(md5h, f1)
	md5String := hex.EncodeToString(md5h.Sum(nil))

	//
	out, createErr := os.Create(p)
	if createErr != nil {
		global.GVA_LOG.Error("function os.Create() Filed", zap.Any("err", createErr.Error()))

		return "", "", "", errors.New("function os.Create() Filed, err:" + createErr.Error())
	}
	defer out.Close() // 创建文件 defer 关闭

	_, copyErr := io.Copy(out, f) // 传输（拷贝）文件
	if copyErr != nil {
		global.GVA_LOG.Error("function io.Copy() Filed", zap.Any("err", copyErr.Error()))
		return "", "", "",  errors.New("function io.Copy() Filed, err:" + copyErr.Error())
	}
	return filepath, filename, md5String, nil
}



//上传文件
func (e *UploadFileService) UploadFile(gameId int, header *multipart.FileHeader) (file response.UploadFileResponse, err error) {
	//查询数据库记录数
	var count int64
	//获取最后一条记录
	var lastRecord response.UploadFileResponse
	var version int
	filePath, key, md5String, uploadErr := e.UploadFileFunc(header)
	if uploadErr != nil {
		panic(err)
	}

	global.GVA_DB.Table("upload_file").Where("game_id = ?", gameId).Count(&count)
	if count == 0 {
		version = 1
	} else {
		global.GVA_DB.Table("upload_file").Where("game_id = ?", gameId).Last(&lastRecord)
		version = lastRecord.Version + 1
	}

	s := strings.Split(header.Filename, ".")
	f := response.UploadFileResponse{
		GameID: gameId,
		Url:  filePath,
		Name: header.Filename,
		Tag:  s[len(s)-1],
		Key:  key,
		Version: version,
		Md5String: md5String,
	}
	return f, e.Upload(f)
}

//下载文件
func (e *UploadFileService) DownloadFile(gameId int, md5String string) (info response.DownloadFile, err error) {
	var file response.UploadFileResponse
	var prefix string = global.GVA_CONFIG.PrefixUrl.PrefixLocal
	//数据库中无记录，即不需要更新
	err = global.GVA_DB.Table("upload_file").Where("game_id = ?", gameId).Last(&file).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		info = response.DownloadFile{
			Url: "",
			Md5String: "",
			Flag: false,
		}
		return info, errors.New("无对应game_id")
	}

	if file.Md5String == md5String {
		info = response.DownloadFile{
			Url: "",
			Md5String: "",
			Flag: false,
		}
	} else {
		fullUrl := prefix + file.Url
		info = response.DownloadFile{
			Url: fullUrl,
			Md5String: file.Md5String,
			Flag: true,
		}
	}

	return info, err


}