// TransactionHash returns transaction hash for a given Transaction based on the network
func TransactionHash(tx *xdr.Transaction, networkPassphrase string) ([32]byte, error) {
	var txBytes bytes.Buffer

	_, err := fmt.Fprintf(&txBytes, "%s", hash.Hash([]byte(networkPassphrase)))
	if err != nil {
		return [32]byte{}, err
	}

	_, err = xdr.Marshal(&txBytes, xdr.EnvelopeTypeEnvelopeTypeTx)
	if err != nil {
		return [32]byte{}, err
	}

	_, err = xdr.Marshal(&txBytes, tx)
	if err != nil {
		return [32]byte{}, err
	}

	return hash.Hash(txBytes.Bytes()), nil
}
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// Hash returns the hash of this builder's transaction.
func (b *TransactionBuilder) Hash() ([32]byte, error) {
	var txBytes bytes.Buffer

	_, err := fmt.Fprintf(&txBytes, "%s", b.NetworkID)
	if err != nil {
		return [32]byte{}, err
	}

	_, err = xdr.Marshal(&txBytes, xdr.EnvelopeTypeEnvelopeTypeTx)
	if err != nil {
		return [32]byte{}, err
	}

	_, err = xdr.Marshal(&txBytes, b.TX)
	if err != nil {
		return [32]byte{}, err
	}

	return hash.Hash(txBytes.Bytes()), nil
}
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func ID(passphrase string) [32]byte {
	return hash.Hash([]byte(passphrase))
}
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// ExampleLowLevelTransaction creates and signs a simple transaction, and then
// encodes it into a hex string capable of being submitted to stellar-core.
//
// It uses the low-level xdr facilities to create the transaction.
func ExampleLowLevelTransaction() {
	skp := keypair.MustParse("SA26PHIKZM6CXDGR472SSGUQQRYXM6S437ZNHZGRM6QA4FOPLLLFRGDX")
	dkp := keypair.MustParse("SBQHO2IMYKXAYJFCWGXC7YKLJD2EGDPSK3IUDHVJ6OOTTKLSCK6Z6POM")

	asset, err := xdr.NewAsset(xdr.AssetTypeAssetTypeNative, nil)
	if err != nil {
		panic(err)
	}

	destination, err := AddressToAccountId(dkp.Address())
	if err != nil {
		panic(err)
	}

	op := xdr.PaymentOp{
		Destination: destination,
		Asset:       asset,
		Amount:      50 * 10000000,
	}

	memo, err := xdr.NewMemo(xdr.MemoTypeMemoNone, nil)

	source, err := AddressToAccountId(skp.Address())
	if err != nil {
		panic(err)
	}

	body, err := xdr.NewOperationBody(xdr.OperationTypePayment, op)
	if err != nil {
		panic(err)
	}

	tx := xdr.Transaction{
		SourceAccount: source,
		Fee:           10,
		SeqNum:        xdr.SequenceNumber(1),
		Memo:          memo,
		Operations: []xdr.Operation{
			{Body: body},
		},
	}

	var txBytes bytes.Buffer
	_, err = xdr.Marshal(&txBytes, tx)
	if err != nil {
		panic(err)
	}

	txHash := hash.Hash(txBytes.Bytes())
	signature, err := skp.Sign(txHash[:])
	if err != nil {
		panic(err)
	}

	ds := xdr.DecoratedSignature{
		Hint:      skp.Hint(),
		Signature: xdr.Signature(signature[:]),
	}

	txe := xdr.TransactionEnvelope{
		Tx:         tx,
		Signatures: []xdr.DecoratedSignature{ds},
	}

	var txeBytes bytes.Buffer
	_, err = xdr.Marshal(&txeBytes, txe)
	if err != nil {
		panic(err)
	}
	txeB64 := base64.StdEncoding.EncodeToString(txeBytes.Bytes())

	fmt.Printf("tx base64: %s", txeB64)
	// Output: tx base64: AAAAAAU08yUQ8sHqhY8j9mXWwERfHC/3cKFSe/spAr0rGtO2AAAACgAAAAAAAAABAAAAAAAAAAAAAAABAAAAAAAAAAEAAAAA+fnTe7/v4whpBUx96oj92jfZPz7S00l3O2xeyeqWIA0AAAAAAAAAAB3NZQAAAAAAAAAAASsa07YAAABAieruUIGcQH6RlQ+prYflPFU3nED2NvWhtaC+tgnKsqgiKURK4xo/W7EgH0+I6aQok52awbE+ksOxEQ5MLJ9eAw==
}