package encx

import (

"encoding/json"

"time"

)

// EncryptionMetadata contains metadata about how a struct was encrypted

type EncryptionMetadata struct {

PepperVersion int `json:"pepper_version"`

KEKAlias string `json:"kek_alias"`

EncryptionTime int64 `json:"encryption_time"`

GeneratorVersion string `json:"generator_version"`

}

// ToJSON serializes the metadata to JSON bytes

func (em *EncryptionMetadata) ToJSON() ([]byte, error) {

return json.Marshal(em)

}

// FromJSON deserializes metadata from JSON bytes

func (em *EncryptionMetadata) FromJSON(data []byte) error {

return json.Unmarshal(data, em)

}

// NewEncryptionMetadata creates a new EncryptionMetadata instance

func NewEncryptionMetadata(kekAlias, generatorVersion string, pepperVersion int) *EncryptionMetadata {

return &EncryptionMetadata{

PepperVersion: pepperVersion,

KEKAlias: kekAlias,

EncryptionTime: time.Now().Unix(),

GeneratorVersion: generatorVersion,

}

}

// Validate checks if the metadata is valid

func (em *EncryptionMetadata) Validate() error {

if em.KEKAlias == "" {

return ErrMissingKEKAlias

}

if em.GeneratorVersion == "" {

return ErrMissingGeneratorVersion

}

return nil

}