package store

import (
	"encoding/json"
	"jjl-tools/tinodeService/store/types"
)

// Unique ID generator
var uGen types.UidGenerator

type configType struct {
	// 16-byte key for XTEA. Used to initialize types.UidGenerator.
	UidKey []byte `json:"uid_key"`
	// Maximum number of results to return from adapter.
	MaxResults int `json:"max_results"`
	// Configurations for individual adapters.
	Adapters map[string]json.RawMessage `json:"adapters"`
}

// GetUid generates a unique ID suitable for use as a primary key.
func GetUid() types.Uid {
	return uGen.Get()
}

// GetUidString generate unique ID as string
func GetUidString() string {
	return uGen.GetStr()
}

// DecodeUid takes an XTEA encrypted Uid and decrypts it into an int64.
// This is needed for sql compatibility. Tte original int64 values
// are generated by snowflake which ensures that the top bit is unset.
func DecodeUid(uid types.Uid) int64 {
	if uid.IsZero() {
		return 0
	}
	return uGen.DecodeUid(uid)
}

// EncodeUid applies XTEA encryption to an int64 value. It's the inverse of DecodeUid.
func EncodeUid(id int64) types.Uid {
	if id == 0 {
		return types.ZeroUid
	}
	return uGen.EncodeInt64(id)
}

// UsersObjMapper is a users struct to hold methods for persistence mapping for the User object.
type UsersObjMapper struct{}

// Users is the ancor for storing/retrieving User objects
var Users UsersObjMapper