package btcwire

import (
	"git.smesh.lol/nostrino/pkg/crypto/chainhash"
)

// Tx is a raw transaction. This package does not parse transactions: the
// payload is carried verbatim, which is all a compact-filter light client
// needs to relay or hash it.
type Tx struct {
	// Raw is the serialized transaction, without the frame header.
	Raw []byte
}

// EncodePayload returns the raw transaction bytes. The result aliases Raw.
func (t *Tx) EncodePayload() ([]byte, error) {
	return t.Raw, nil
}

// DecodePayload stores the raw transaction bytes. The stored slice aliases b.
func (t *Tx) DecodePayload(b []byte) error {
	t.Raw = b
	return nil
}

// TxID returns SHA256d of the raw transaction, in internal byte order. For a
// transaction that spends no witness data the txid and wtxid are equal.
func (t *Tx) TxID() chainhash.Hash {
	return chainhash.DoubleHashH(t.Raw)
}