package logic

import (
	"encoding/json"
	"fusenapi/utils/auth"
	"fusenapi/utils/basic"
	"fusenapi/utils/file"
	"fusenapi/utils/hash"
	"io"
	"net/http"

	"context"

	"fusenapi/server/upload/internal/svc"
	"fusenapi/server/upload/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
	"github.com/zeromicro/go-zero/core/mr"
)

type UploadFilesBackendLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
	r      *http.Request
}

func NewUploadFilesBackendLogic(r *http.Request, svcCtx *svc.ServiceContext) *UploadFilesBackendLogic {
	return &UploadFilesBackendLogic{
		Logger: logx.WithContext(r.Context()),
		ctx:    r.Context(),
		svcCtx: svcCtx,
		r:      r,
	}
}

// 处理进入前逻辑w,r
// func (l *UploadFilesBackendLogic) BeforeLogic(w http.ResponseWriter, r *http.Request) {
// }

// 处理逻辑后 w,r 如:重定向, resp 必须重新处理
// func (l *UploadFilesBackendLogic) AfterLogic(w http.ResponseWriter, r *http.Request, resp *basic.Response) {
// // httpx.OkJsonCtx(r.Context(), w, resp)
// }

func (l *UploadFilesBackendLogic) UploadFilesBackend(req *types.UploadFilesReq, userinfo *auth.UserInfo) (resp *basic.Response) {
	// 返回值必须调用Set重新返回, resp可以空指针调用 resp.SetStatus(basic.CodeOK, data)
	// userinfo 传入值时, 一定不为null
	if userinfo.IsOnlooker() {
		// 如果是，返回未授权的错误码
		return resp.SetStatus(basic.CodeUnAuth)
	}

	// 定义用户ID和S3键名格式
	var userId int64
	var guestId int64

	// 检查用户是否是游客
	if userinfo.IsGuest() {
		// 如果是，使用游客ID和游客键名格式
		guestId = userinfo.GuestId
	} else {
		// 否则，使用用户ID和用户键名格式
		userId = userinfo.UserId
	}

	var uploadInfoList []UploadInfo
	err := json.Unmarshal([]byte(req.UploadInfo), &uploadInfoList)
	if err != nil {
		logx.Error(err)
		return resp.SetStatus(basic.CodeFileUploadErr, "file upload err,params Unmarshal failed")
	}

	var fileLen = len(uploadInfoList)

	if fileLen == 0 {
		return resp.SetStatus(basic.CodeFileUploadErr, "file upload err,no files")
	}
	if req.ApiType == 1 && fileLen > 100 {
		return resp.SetStatus(basic.CodeFileUploadErr, "file upload err, files count is beyond the maximum")
	}

	// 定义存储桶名称
	var bucketName *string

	// 根据类别选择存储桶
	switch req.UploadBucket {
	case 2:
		bucketName = basic.TempfileBucketName
	default:
		bucketName = basic.StorageBucketName
	}

	//设置内存大小
	l.r.ParseMultipartForm(32 << 20)

	//获取上传的文件组
	files := l.r.MultipartForm.File["file"]

	result, err := mr.MapReduce(func(source chan<- interface{}) {
		for i, info := range uploadInfoList {
			fileType := files[i].Header.Get("Content-Type")
			// 打开文件
			file, err := files[i].Open()
			if err != nil {
				logx.Error(err)
			}
			defer file.Close()
			// 读取数据流
			ioData, err := io.ReadAll(file)
			if err != nil {
				logx.Error(err)
			}

			// 一系列业务逻辑....验证类型,文件大小

			var hashKey string = hash.JsonHashKey(info.FileKeys)
			source <- UploadData{
				FileKey:  info.FileKeys,
				FileType: fileType,
				Metadata: info.Metadata,
				FileData: ioData,
				ApiType:  req.ApiType,
				Bucket:   bucketName,
				HashKey:  hashKey,
			}
		}
	}, func(item interface{}, writer mr.Writer[interface{}], cancel func(error)) {
		uploadDataInfo := item.(UploadData)

		var uploadUrl = UploadUrl{}
		uploadUrl.Key = uploadDataInfo.FileKey
		uploadUrl.ApiType = uploadDataInfo.ApiType
		uploadUrl.ResourceType = uploadDataInfo.FileType

		var resourceId string = uploadDataInfo.HashKey

		// 上传文件
		var upload = file.Upload{
			Ctx:        l.ctx,
			MysqlConn:  l.svcCtx.MysqlConn,
			AwsSession: l.svcCtx.AwsSession,
		}
		uploadRes, err := upload.UploadFileByByte(&file.UploadBaseReq{
			FileHash:     resourceId,
			FileByte:     uploadDataInfo.FileData,
			UploadBucket: 1,
			ApiType:      2,
			UserId:       userId,
			GuestId:      guestId,
		})
		if err == nil {
			uploadUrl.ResourceId = uploadRes.ResourceId
			uploadUrl.ResourceType = uploadRes.ResourceType
			uploadUrl.ResourceUrl = uploadRes.ResourceUrl
			// Notice 这个必须加!
			writer.Write(uploadUrl)
		}
	}, func(pipe <-chan interface{}, writer mr.Writer[interface{}], cancel func(error)) {
		var uploadUrlList = make(map[string][]*UploadUrl)
		var uploadUrlListFail []*UploadUrl
		var uploadUrlListSuccess []*UploadUrl
		for p := range pipe {
			var uploadUrl = p.(UploadUrl)
			if uploadUrl.Status == 1 {
				uploadUrlListSuccess = append(uploadUrlListSuccess, &uploadUrl)
			} else {
				uploadUrlListFail = append(uploadUrlListFail, &uploadUrl)
			}
		}

		// Notice 这个必须加!
		uploadUrlList["success"] = uploadUrlListSuccess
		uploadUrlList["fail"] = uploadUrlListFail
		writer.Write(uploadUrlList)
	})
	if err != nil {
		logx.Error(err)
	}

	// 返回成功的响应和上传URL
	return resp.SetStatus(basic.CodeOK, map[string]interface{}{
		"upload_data": result,
	})
}

type UploadInfo struct {
	FileSize int64   `json:"file_size"` // 上传文件大小
	FileKeys string  `json:"file_keys"` // 上传文件唯一标识
	FileData *string `json:"file_data"` // 上传文件Base64
	Metadata string  `json:"meta_data"` // 上传文件额外信息
}

type UploadData struct {
	ApiType  int64   `json:"api_type"`
	FileSize int64   `json:"file_size"`
	FileType string  `json:"file_type"`
	FileKey  string  `json:"file_key"`
	Metadata string  `json:"metadata"`
	Bucket   *string `json:"bucket"`
	HashKey  string  `json:"hash_key"`
	FileData []byte  `fsfile:"data"`
}

type UploadUrl struct {
	Key          string `json:"key"`
	Status       int64  `json:"status"`
	ApiType      int64  `json:"api_type"`
	ResourceId   string `json:"resource_id"`
	ResourceType string `json:"resource_type"`
	ResourceUrl  string `json:"resource_url"`
}