package directory

import (
	"encoding/hex"
	"log"
	"pkg/storage"
	"strconv"
	"strings"
	"pkg/util"
)

type FileId struct {
	VolumeId storage.VolumeId
	Key      uint64
	Hashcode uint32
}

func NewFileId(VolumeId storage.VolumeId, Key uint64, Hashcode uint32) *FileId {
	return &FileId{VolumeId: VolumeId, Key: Key, Hashcode: Hashcode}
}
func ParseFileId(fid string) *FileId{
	a := strings.Split(fid, ",")
	if len(a) != 2 {
		log.Println("Invalid fid", fid, ", split length", len(a))
		return nil
	}
	vid_string, key_hash_string := a[0], a[1]
	vid, _ := strconv.ParseUint(vid_string, 10, 64)
	key, hash := storage.ParseKeyHash(key_hash_string)
	return &FileId{VolumeId: storage.VolumeId(vid), Key: key, Hashcode: hash}
}
func (n *FileId) String() string {
	bytes := make([]byte, 12)
	util.Uint64toBytes(bytes[0:8], n.Key)
	util.Uint32toBytes(bytes[8:12], n.Hashcode)
	nonzero_index := 0
	for ; bytes[nonzero_index] == 0; nonzero_index++ {
	}
	return strconv.FormatUint(uint64(n.VolumeId), 10) + "," + hex.EncodeToString(bytes[nonzero_index:])
}