package s3

import (
	"context"
	"io"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/s3"
	stgtypes "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/types"
	jcstypes "gitlink.org.cn/cloudream/jcs-pub/common/types"
)

type DirReader struct {
	cli      *s3.Client
	bucket   string
	rootPath jcstypes.JPath
	marker   *string
	curInfos []stgtypes.DirEntry
	eof      bool
}

func (r *DirReader) Next() (stgtypes.DirEntry, error) {
	if len(r.curInfos) > 0 {
		e := r.curInfos[0]
		r.curInfos = r.curInfos[1:]
		return e, nil
	}
	if r.eof {
		return stgtypes.DirEntry{}, io.EOF
	}

	resp, err := r.cli.ListObjects(context.Background(), &s3.ListObjectsInput{
		Bucket: aws.String(r.bucket),
		Prefix: aws.String(r.rootPath.String()),
		Marker: r.marker,
	})
	if err != nil {
		return stgtypes.DirEntry{}, err
	}

	for _, obj := range resp.Contents {
		key := jcstypes.PathFromJcsPathString(*obj.Key)

		r.curInfos = append(r.curInfos, stgtypes.DirEntry{
			Path:    key,
			Size:    *obj.Size,
			ModTime: *obj.LastModified,
			IsDir:   false,
		})
	}

	if !*resp.IsTruncated {
		r.eof = true
	}
	r.marker = resp.NextMarker

	return r.Next()
}
func (r *DirReader) Close() {

}