package conf

import (
	"encoding/json"
	"fmt"
)

// Encryption is the encryption parameter.
type Encryption int

// supported encryption policies.
const (
	EncryptionNo Encryption = iota
	EncryptionOptional
	EncryptionStrict
)

// MarshalJSON marshals a Encryption into JSON.
func (d Encryption) MarshalJSON() ([]byte, error) {
	var out string

	switch d {
	case EncryptionNo:
		out = "no"

	case EncryptionOptional:
		out = "optional"

	default:
		out = "strict"
	}

	return json.Marshal(out)
}

// UnmarshalJSON unmarshals a Encryption from JSON.
func (d *Encryption) UnmarshalJSON(b []byte) error {
	var in string
	if err := json.Unmarshal(b, &in); err != nil {
		return err
	}

	switch in {
	case "no", "false":
		*d = EncryptionNo

	case "optional":
		*d = EncryptionOptional

	case "strict", "yes", "true":
		*d = EncryptionStrict

	default:
		return fmt.Errorf("invalid encryption value: '%s'", in)
	}

	return nil
}