bitcoin

type BitcoinWallet interface {

	// Start the wallet
	Start()

	// Return the network parameters
	Params() *chaincfg.Params

	// Returns the type of crytocurrency this wallet implements
	CurrencyCode() string

	// Get the master private key
	MasterPrivateKey() *hd.ExtendedKey

	// Get the master public key
	MasterPublicKey() *hd.ExtendedKey

	// Get the current address for the given purpose
	CurrentAddress(purpose spvwallet.KeyPurpose) btc.Address

	// Returns a fresh address that has never been returned by this function
	NewAddress(purpose spvwallet.KeyPurpose) btc.Address

	// Returns if the wallet has the key for the given address
	HasKey(addr btc.Address) bool

	// Get the confirmed and unconfirmed balances
	Balance() (confirmed, unconfirmed int64)

	// Returns a list of transactions for this wallet
	Transactions() ([]spvwallet.Txn, error)

	// Get the height of the blockchain
	ChainTip() uint32

	// Get the current fee per byte
	GetFeePerByte(feeLevel spvwallet.FeeLevel) uint64

	// Send bitcoins to an external wallet
	Spend(amount int64, addr btc.Address, feeLevel spvwallet.FeeLevel) (*chainhash.Hash, error)

	// Bump the fee for the given transaction
	BumpFee(txid chainhash.Hash) (*chainhash.Hash, error)

	// Calculates the estimated size of the transaction and returns the total fee for the given feePerByte
	EstimateFee(ins []spvwallet.TransactionInput, outs []spvwallet.TransactionOutput, feePerByte uint64) uint64

	// Build and broadcast a transaction that sweeps all coins from an address. If it is a p2sh multisig, the redeemScript must be included
	SweepAddress(utxos []spvwallet.Utxo, address *btc.Address, key *hd.ExtendedKey, redeemScript *[]byte, feeLevel spvwallet.FeeLevel) (*chainhash.Hash, error)

	// Create a signature for a multisig transaction
	CreateMultisigSignature(ins []spvwallet.TransactionInput, outs []spvwallet.TransactionOutput, key *hd.ExtendedKey, redeemScript []byte, feePerByte uint64) ([]spvwallet.Signature, error)

	// Combine signatures and broadcast
	Multisign(ins []spvwallet.TransactionInput, outs []spvwallet.TransactionOutput, sigs1 []spvwallet.Signature, sigs2 []spvwallet.Signature, redeemScript []byte, feePerByte uint64) error

	// Generate a multisig script from public keys
	GenerateMultisigScript(keys []hd.ExtendedKey, threshold int) (addr btc.Address, redeemScript []byte, err error)

	// Add a script to the wallet and get notifications back when coins are received or spent from it
	AddWatchedScript(script []byte) error

	// Add a callback for incoming transactions
	AddTransactionListener(func(spvwallet.TransactionCallback))

	// Use this to re-download merkle blocks in case of missed transactions
	ReSyncBlockchain(fromHeight int32)

	// Return the number of confirmations for a transaction
	GetConfirmations(txid chainhash.Hash) (uint32, error)

	// Cleanly disconnect from the wallet
	Close()
}

type ExchangeRates interface {

	/* Fetch the exchange rate for the given currency
	   It is OK if this returns from a cache. */
	GetExchangeRate(currencyCode string) (float64, error)

	// Update the prices with the current exchange rate before returning
	GetLatestRate(currencyCode string) (float64, error)

	/* Returns all available rates
	   It is OK if this returns from cach. */
	GetAllRates() (map[string]float64, error)

	/* Return the number of currency units per coin. For example, in bitcoin
	   this is 100m satoshi per BTC. This is used when converting from fiat
	   to the smaller currency unit. */
	UnitsPerCoin() int
}