package transport

import (
	"encoding/json"
	"fmt"

	"iop/packages/protocol"
)

// encodeEnvelope marshals env to JSON bytes (the frame payload).
func encodeEnvelope(env *protocol.Envelope) ([]byte, error) {
	return json.Marshal(env)
}

// decodeEnvelope unmarshals frame payload bytes into an Envelope.
func decodeEnvelope(data []byte) (*protocol.Envelope, error) {
	var env protocol.Envelope
	if err := json.Unmarshal(data, &env); err != nil {
		return nil, fmt.Errorf("decode envelope: %w", err)
	}
	return &env, nil
}

// encodePayload marshals an inner message to JSON bytes for Envelope.Payload.
func encodePayload(v any) ([]byte, error) {
	return json.Marshal(v)
}

// decodePayload unmarshals Envelope.Payload into dst.
func decodePayload(payload []byte, dst any) error {
	return json.Unmarshal(payload, dst)
}