/*

 Copyright (c) [2023] [pcm]
 [pcm-coordinator] is licensed under Mulan PSL v2.
 You can use this software according to the terms and conditions of the Mulan PSL v2.
 You may obtain a copy of Mulan PSL v2 at:
          http://license.coscl.org.cn/MulanPSL2
 THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 EITHER EXPaRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 See the Mulan PSL v2 for more details.

*/

package image

import (
	"bufio"
	"context"
	"encoding/base64"
	"fmt"
	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/service/s3/s3manager"
	types2 "github.com/docker/docker/api/types"
	"github.com/zeromicro/go-zero/core/logx"
	"gitlink.org.cn/jcce-pcm/pcm-coordinator/pkg/models"
	"gitlink.org.cn/jcce-pcm/pcm-coordinator/pkg/repository/result"
	"gitlink.org.cn/jcce-pcm/pcm-coordinator/pkg/utils/fileutils"
	"io/ioutil"
	"k8s.io/apimachinery/pkg/util/json"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"sync"
	"time"

	"gitlink.org.cn/jcce-pcm/pcm-coordinator/api/internal/svc"
)

var dir, _ = os.Getwd()
var uploadPath = filepath.Join(dir, "uploads")

func ChunkHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		size, _ := strconv.ParseInt(r.PostFormValue("size"), 10, 64)
		hash := r.PostFormValue("hash")
		name := r.PostFormValue("name")
		dataType := r.PostFormValue("dataType")
		kind := r.PostFormValue("kind")
		// 对比合并请求的文件大小和已上传文件夹大小
		toSize, err := fileutils.GetDirSize(filepath.Join(uploadTempPath, hash))
		if err != nil {
			logx.Error(err)
			result.HttpResult(r, w, nil, err)
			return
		}
		if size != toSize {
			fmt.Fprintf(w, "文件上传错误")
		}
		chunksPath := filepath.Join(uploadTempPath, hash)
		files, _ := ioutil.ReadDir(chunksPath)
		// 将文件根据索引序号排序
		filesSort := make(map[string]string)
		for _, f := range files {
			nameArr := strings.Split(f.Name(), "-")
			filesSort[nameArr[1]] = f.Name()
		}
		saveFile := filepath.Join(uploadPath, name)
		if exists, _ := fileutils.PathExists(saveFile); exists {
			os.Remove(saveFile)
		}
		fs, _ := os.OpenFile(saveFile, os.O_CREATE|os.O_RDWR|os.O_APPEND, os.ModeAppend|os.ModePerm)

		var wg sync.WaitGroup
		filesCount := len(files)
		if filesCount != len(filesSort) {
			fmt.Fprintf(w, "文件上传错误2")
		}
		wg.Add(filesCount)
		for i := 0; i < filesCount; i++ {
			// 这里一定要注意按顺序读取不然文件就会损坏
			fileName := filepath.Join(chunksPath, filesSort[strconv.Itoa(i)])
			data, err := ioutil.ReadFile(fileName)
			fmt.Println(err)
			fs.Write(data)
			wg.Done()
		}
		wg.Wait()
		os.RemoveAll(chunksPath)

		// 保存到数据库表里
		svcCtx.DbEngin.Create(&models.File{
			Name:     name,
			Hash:     hash,
			DataType: dataType,
			Status:   "local",
			Kind:     kind,
			Bucket:   "pcm"})

		// 根据数据类型按需上传（镜像推送到nexus 数据集和算法推送到云际存储）
		switch kind {
		case "image":
			err = pushImage(svcCtx, hash, name)
		case "dataSet", "algorithm":
			err = uploadStorage(svcCtx, hash, name)
		}
		// 删除本地文件 避免占用本地存储资源
		defer os.Remove(filepath.Join(uploadPath, name))
		defer fs.Close()
		result.HttpResult(r, w, nil, err)
	}
}

// 同步数据集到modelArts
func syncDataSet() {

}

// 上传文件到云集存储
func uploadStorage(svcCtx *svc.ServiceContext, hash string, name string) error {
	fileInfo, err := os.Open(filepath.Join(uploadPath, name))
	if err != nil {
		logx.Error(err)
		return err
	}
	_, err = svcCtx.Uploader.Upload(&s3manager.UploadInput{
		Bucket: aws.String("pcm"),
		Key:    aws.String(name),
		Body:   fileInfo,
	})
	if err != nil {
		logx.Error(err)
		return err
	}
	// 更新数据状态
	svcCtx.DbEngin.Model(&models.File{}).Where("hash = ?", hash).Update("status", "cloud")
	return nil
}

// 推送镜像到nexus仓库
func pushImage(svcCtx *svc.ServiceContext, hash string, name string) error {
	// 加载镜像文件到docker
	fileInfo, err := os.Open(filepath.Join(uploadPath, name))
	if err != nil {
		logx.Error(err)
		return err
	}
	defer fileInfo.Close()
	reader := bufio.NewReader(fileInfo)

	body, err := svcCtx.DockerClient.ImageLoad(context.Background(), reader, false)

	if err != nil {
		logx.Error(err)
		return err
	}
	bytes, err := ioutil.ReadAll(body.Body)
	println(string(bytes))
	if err != nil {
		logx.Error(err)
		return err
	}
	//time.Sleep(12 * 100 * time.Millisecond)
	privateImageName := "registry.cn-hangzhou.aliyuncs.com/jointcloud/pcm:" + name
	// 给镜像打上私有仓库的tag
	err = svcCtx.DockerClient.ImageTag(context.Background(), name, privateImageName)
	if err != nil {
		logx.Error(err)
		return err
	}
	// 删除原镜像
	_, err = svcCtx.DockerClient.ImageRemove(context.Background(), name, types2.ImageRemoveOptions{})
	if err != nil {
		logx.Error(err)
		return err
	}
	// 推送镜像到registry
	authConfig := types2.AuthConfig{
		Username: svcCtx.Config.RegistryConf.Username,
		Password: svcCtx.Config.RegistryConf.Password,
	}
	authConfigBytes, err := json.Marshal(authConfig)
	if err != nil {
		logx.Error(err)
		return err
	}
	logx.Infof(fmt.Sprintln("传输开始", time.Now()))
	authStr := base64.URLEncoding.EncodeToString(authConfigBytes)
	pushBody, err := svcCtx.DockerClient.ImagePush(context.Background(), privateImageName, types2.ImagePushOptions{RegistryAuth: authStr})
	pushBytes, _ := ioutil.ReadAll(pushBody)
	println(string(pushBytes))
	if err != nil {
		logx.Error(err)
		return err
	}
	logx.Infof(fmt.Sprintln("传输完成", time.Now()))
	// 删除本地镜像 避免存储资源浪费
	_, err = svcCtx.DockerClient.ImageRemove(context.Background(), privateImageName, types2.ImageRemoveOptions{})
	if err != nil {
		logx.Error(err)
		return err
	}
	// 更新数据状态
	svcCtx.DbEngin.Model(&models.File{}).Where("hash = ?", hash).Update("status", "cloud")
	return nil
}