package local

import (
	"context"
	"io"
	"os"
	"path/filepath"

	stgtypes "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/types"
	jcstypes "gitlink.org.cn/cloudream/jcs-pub/common/types"
)

type S2STransfer struct {
	feat     *jcstypes.S2STransferFeature
	detail   *jcstypes.UserSpaceDetail
	localStg *jcstypes.LocalCred
	dstPath  jcstypes.JPath
}

// 只有同一个机器的存储之间才可以进行数据直传
func (*S2STransfer) CanTransfer(src, dst *jcstypes.UserSpaceDetail) bool {
	if stgtypes.FindFeature[*jcstypes.S2STransferFeature](dst) == nil {
		return false
	}

	_, ok := src.UserSpace.Storage.(*jcstypes.LocalType)
	if !ok {
		return false
	}

	if src.RecommendHub.HubID != dst.RecommendHub.HubID {
		return false
	}

	return true
}

// 执行数据直传
func (s *S2STransfer) Transfer(ctx context.Context, src *jcstypes.UserSpaceDetail, srcPath jcstypes.JPath, dstPath jcstypes.JPath) (stgtypes.FileInfo, error) {
	s.dstPath = dstPath

	copy, err := os.OpenFile(filepath.Join(s.localStg.RootDir, s.dstPath.JoinOSPath()), os.O_WRONLY|os.O_CREATE, 0644)
	if err != nil {
		return stgtypes.FileInfo{}, err
	}
	defer copy.Close()

	srcFile, err := os.Open(filepath.Join(s.localStg.RootDir, srcPath.JoinOSPath()))
	if err != nil {
		return stgtypes.FileInfo{}, err
	}
	defer srcFile.Close()

	n, err := io.Copy(copy, srcFile)
	if err != nil {
		return stgtypes.FileInfo{}, err
	}

	return stgtypes.FileInfo{
		Path: dstPath,
		Size: n,
		Hash: "",
	}, nil
}

func (s *S2STransfer) Close() {

}