wltbtc

const (
	// PubKeyLength is the length of a serialized compressed public key.
	PubKeyLength = 33

	// 4 bytes version + 4 bytes locktime + 2 bytes of varints for the number of
	// transaction inputs and outputs
	MinimumBlockOverHead = 10

	// DERSigLength is the maximum length of a DER encoded signature with a
	// sighash type byte.
	DERSigLength = 73

	// RefundSigScriptSize is the worst case (largest) serialize size
	// of a transaction input script that refunds a compressed P2PKH output.
	// It is calculated as:
	//
	//   - OP_DATA_73
	//   - 72 bytes DER signature + 1 byte sighash
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	DefaultSigScriptSize = 1 + DERSigLength + 1 + 33 // 108

	// Overhead for a wire.TxIn. See wire.TxIn.SerializeSize.
	// hash 32 bytes + index 4 bytes + sequence 4 bytes.
	TxInOverhead = 32 + 4 + 4 // 40

	// TxOutOverhead is the overhead associated with a transaction output.
	// 8 bytes value + at least 1 byte varint script size
	TxOutOverhead = 8 + 1

	RedeemP2PKSigScriptSize = 1 + DERSigLength

	// P2SHPkScriptSize is the size of a transaction output script that
	// pays to a redeem script.  It is calculated as:
	//
	//   - OP_HASH160
	//   - OP_DATA_20
	//   - 20 bytes redeem script hash
	//   - OP_EQUAL
	P2SHPkScriptSize = 1 + 1 + 20 + 1

	// P2SHOutputSize is the size of the serialized P2SH output.
	P2SHOutputSize = TxOutOverhead + P2SHPkScriptSize // 9 + 23 = 32

	// P2WSHPkScriptSize is the size of a segwit transaction output script that
	// pays to a redeem script.  It is calculated as:
	//
	//   - OP_0
	//   - OP_DATA_32
	//   - 32 bytes redeem script hash
	P2WSHPkScriptSize = 1 + 1 + 32

	// P2WSHOutputSize is the size of the serialized P2WSH output.
	P2WSHOutputSize = TxOutOverhead + P2WSHPkScriptSize // 9 + 34 = 43

	// RedeemP2WPKHInputSize is the worst case size of a transaction
	// input redeeming a P2WPKH output. This does not account for witness data,
	// which is considered at a lower weight for fee calculations. It is
	// calculated as
	//
	//   - 32 bytes previous tx
	//   - 4 bytes output index
	//   - 4 bytes sequence
	//   - 1 byte encoding empty redeem script
	//   - 0 bytes signature script
	RedeemP2WPKHInputSize = TxInOverhead + 1

	// RedeemP2WPKHInputWitnessWeight is the worst case weight of
	// a witness for spending P2WPKH and nested P2WPKH outputs. It
	// is calculated as:
	//
	//   - 1 wu compact int encoding value 2 (number of items)
	//   - 1 wu compact int encoding value 73
	//   - 72 wu DER signature + 1 wu sighash
	//   - 1 wu compact int encoding value 33
	//   - 33 wu serialized compressed pubkey
	// NOTE: witness data is not script.
	RedeemP2WPKHInputWitnessWeight = 1 + 1 + DERSigLength + 1 + 33 // 109

	// RedeemP2WPKHInputTotalSize is the worst case size of a transaction
	// input redeeming a P2WPKH output and the corresponding witness data.
	// It is calculated as:
	//
	// 41 vbytes base tx input
	// 109wu witness = 28 vbytes
	// total = 69 vbytes
	RedeemP2WPKHInputTotalSize = RedeemP2WPKHInputSize +
		(RedeemP2WPKHInputWitnessWeight+(witnessWeight-1))/witnessWeight

	// SigwitMarkerAndFlagWeight is the 2 bytes of overhead witness data
	// added to every segwit transaction.
	SegwitMarkerAndFlagWeight = 2

	// P2WPKHPkScriptSize is the size of a transaction output script that
	// pays to a witness pubkey hash. It is calculated as:
	//
	//   - OP_0
	//   - OP_DATA_20
	//   - 20 bytes pubkey hash
	P2WPKHPkScriptSize = 1 + 1 + 20

	// P2WPKHOutputSize is the serialize size of a transaction output with a
	// P2WPKH output script. It is calculated as:
	//
	//   - 8 bytes output value
	//   - 1 byte compact int encoding value 22
	//   - 22 bytes P2PKH output script
	P2WPKHOutputSize = TxOutOverhead + P2WPKHPkScriptSize // 31

	// MinimumTxOverhead is the size of an empty transaction.
	// 4 bytes version + 4 bytes locktime + 2 bytes of varints for the number of
	// transaction inputs and outputs
	MinimumTxOverhead = 4 + 4 + 1 + 1 // 10

	// InitTxSizeBase is the size of a standard serialized atomic swap
	// initialization transaction with one change output and no inputs. This is
	// MsgTx overhead + 1 P2PKH change output + 1 P2SH contract output. However,
	// the change output might be P2WPKH, in which case it would be smaller.
	InitTxSizeBase = MinimumTxOverhead + P2PKHOutputSize + P2SHOutputSize // 10 + 34 + 32 = 76

	// InitTxSize is InitTxBaseSize + 1 P2PKH input
	InitTxSize = InitTxSizeBase + RedeemP2PKHInputSize // 76 + 149 = 225

	// InitTxSizeBaseSegwit is the size of a standard serialized atomic swap
	// initialization transaction with one change output and no inputs. The
	// change output is assumed to be segwit. 10 + 31 + 43 = 84
	InitTxSizeBaseSegwit = MinimumTxOverhead + P2WPKHOutputSize + P2WSHOutputSize

	// InitTxSizeSegwit is InitTxSizeSegwit + 1 P2WPKH input.
	// 84 vbytes base tx
	// 41 vbytes base tx input
	// 109wu witness +  2wu segwit marker and flag = 28 vbytes
	// total = 153 vbytes
	InitTxSizeSegwit = InitTxSizeBaseSegwit + RedeemP2WPKHInputSize +
		(SegwitMarkerAndFlagWeight+RedeemP2WPKHInputWitnessWeight+(witnessWeight-1))/witnessWeight
)

const (
	// RedeemP2PKHSigScriptSize is the worst case (largest) serialize size
	// of a transaction input script that redeems a compressed P2PKH output.
	// It is calculated as:
	//
	//   - OP_DATA_73
	//   - 72 bytes DER signature + 1 byte sighash
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	RedeemP2PKHSigScriptSize = 1 + 73 + 1 + 33

	// RedeemP2SHMultisigSigScriptSize is the worst case (largest) serialize size
	// of a transaction input script that redeems a 2 of 3 P2SH multisig output with compressed keys.
	// It is calculated as:
	//
	//   - OP_0
	//   - OP_DATA_72
	//   - 72 bytes DER signature
	//   - OP_DATA_72
	//   - 72 bytes DER signature
	//   - OP_PUSHDATA
	//   - OP_2
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP3
	//   - OP_CHECKMULTISIG
	RedeemP2SH2of3MultisigSigScriptSize = 1 + 1 + 72 + 1 + 72 + 1 + 1 + 1 + 33 + 1 + 33 + 1 + 33 + 1 + 1

	// RedeemP2SH1of2MultisigSigScriptSize is the worst case (largest) serialize size
	// of a transaction input script that redeems a 1 of 2 P2SH multisig output with compressed keys.
	// It is calculated as:
	//
	//   - OP_0
	//   - OP_DATA_72
	//   - 72 bytes DER signature
	//   - OP_PUSHDATA
	//   - OP_1
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP2
	//   - OP_CHECKMULTISIG
	RedeemP2SH1of2MultisigSigScriptSize = 1 + 1 + 72 + 1 + 1 + 1 + 33 + 1 + 33 + 1 + 1

	// RedeemP2SHMultisigTimelock1SigScriptSize is the worst case (largest) serialize size
	// of a transaction input script that redeems a compressed P2SH timelocked multisig using the timeout.
	// It is calculated as:
	//
	//   - OP_DATA_72
	//   - 72 bytes DER signature
	//   - OP_0
	//   - OP_PUSHDATA
	//   - OP_IF
	//   - OP_2
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP3
	//   - OP_CHECKMULTISIG
	//   - OP_ELSE
	//   - OP_PUSHDATA
	//   - 2 byte block height
	//   - OP_CHECKSEQUENCEVERIFY
	//   - OP_DROP
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_CHECKSIG
	//   - OP_ENDIF
	RedeemP2SHMultisigTimelock1SigScriptSize = 1 + 72 + 1 + 1 + 1 + 1 + 1 + 33 + 1 + 33 + 1 + 33 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 33 + 1 + 1

	// RedeemP2SHMultisigTimelock2SigScriptSize is the worst case (largest) serialize size
	// of a transaction input script that redeems a compressed P2SH timelocked multisig without using the timeout.
	// It is calculated as:
	//
	//   - OP_0
	//   - OP_DATA_72
	//   - 72 bytes DER signature
	//   - OP_DATA_72
	//   - 72 bytes DER signature
	//   - OP_1
	//   - OP_PUSHDATA
	//   - OP_IF
	//   - OP_2
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP3
	//   - OP_CHECKMULTISIG
	//   - OP_ELSE
	//   - OP_PUSHDATA
	//   - 2 byte block height
	//   - OP_CHECKSEQUENCEVERIFY
	//   - OP_DROP
	//   - OP_DATA_33
	//   - 33 bytes serialized compressed pubkey
	//   - OP_CHECKSIG
	//   - OP_ENDIF
	RedeemP2SHMultisigTimelock2SigScriptSize = 1 + 1 + 72 + +1 + 72 + 1 + 1 + 1 + 1 + 1 + 33 + 1 + 33 + 1 + 33 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 33 + 1 + 1

	// P2PKHPkScriptSize is the size of a transaction output script that
	// pays to a compressed pubkey hash.  It is calculated as:
	//
	//   - OP_DUP
	//   - OP_HASH160
	//   - OP_DATA_20
	//   - 20 bytes pubkey hash
	//   - OP_EQUALVERIFY
	//   - OP_CHECKSIG
	P2PKHPkScriptSize = 1 + 1 + 1 + 20 + 1 + 1

	// RedeemP2PKHInputSize is the worst case (largest) serialize size of a
	// transaction input redeeming a compressed P2PKH output.  It is
	// calculated as:
	//
	//   - 32 bytes previous tx
	//   - 4 bytes output index
	//   - 1 byte script len
	//   - signature script
	//   - 4 bytes sequence
	RedeemP2PKHInputSize = 32 + 4 + 1 + RedeemP2PKHSigScriptSize + 4

	// RedeemP2SH2of3MultisigInputSize is the worst case (largest) serialize size of a
	// transaction input redeeming a compressed P2SH 2 of 3 multisig output.  It is
	// calculated as:
	//
	//   - 32 bytes previous tx
	//   - 4 bytes output index
	//   - 1 byte script len
	//   - 4 bytes sequence
	///  - witness discounted signature script
	RedeemP2SH2of3MultisigInputSize = 32 + 4 + 1 + 4 + (RedeemP2SH2of3MultisigSigScriptSize / 4)

	// RedeemP2SH1of2MultisigInputSize is the worst case (largest) serialize size of a
	// transaction input redeeming a compressed P2SH 2 of 3 multisig output.  It is
	// calculated as:
	//
	//   - 32 bytes previous tx
	//   - 4 bytes output index
	//   - 1 byte script len
	//   - 4 bytes sequence
	///  - witness discounted signature script
	RedeemP2SH1of2MultisigInputSize = 32 + 4 + 1 + 4 + (RedeemP2SH1of2MultisigSigScriptSize / 4)

	// RedeemP2SHMultisigTimelock1InputSize is the worst case (largest) serialize size of a
	// transaction input redeeming a compressed p2sh timelocked multig output with using the timeout.  It is
	// calculated as:
	//
	//   - 32 bytes previous tx
	//   - 4 bytes output index
	//   - 1 byte script len
	//   - 4 bytes sequence
	///  - witness discounted signature script
	RedeemP2SHMultisigTimelock1InputSize = 32 + 4 + 1 + 4 + (RedeemP2SHMultisigTimelock1SigScriptSize / 4)

	// RedeemP2SHMultisigTimelock2InputSize is the worst case (largest) serialize size of a
	// transaction input redeeming a compressed P2SH timelocked multisig output without using the timeout.  It is
	// calculated as:
	//
	//   - 32 bytes previous tx
	//   - 4 bytes output index
	//   - 1 byte script len
	//   - 4 bytes sequence
	///  - witness discounted signature script
	RedeemP2SHMultisigTimelock2InputSize = 32 + 4 + 1 + 4 + (RedeemP2SHMultisigTimelock2SigScriptSize / 4)

	// P2PKHOutputSize is the serialize size of a transaction output with a
	// P2PKH output script.  It is calculated as:
	//
	//   - 8 bytes output value
	//   - 1 byte compact int encoding value 25
	//   - 25 bytes P2PKH output script
	P2PKHOutputSize = 8 + 1 + P2PKHPkScriptSize
)

const GAP_LIMIT = client.GAP_LIMIT

const MAX_TX_INPUTS = 50 //TODO: enforce this

const WalletVersion = "0.1.0"