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var network = map[string]Network{
	"rdd": {name: "reddcoin", symbol: "rdd", xpubkey: 0x3d, xprivatekey: 0xbd},
	"dgb": {name: "digibyte", symbol: "dgb", xpubkey: 0x1e, xprivatekey: 0x80},
	"btc": {name: "bitcoin", symbol: "btc", xpubkey: 0x00, xprivatekey: 0x80},
	"ltc": {name: "litecoin", symbol: "ltc", xpubkey: 0x30, xprivatekey: 0xb0},
}

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// CreatePrivateKey 生成一个二进制的私钥，并返回一个wif对象
func (network Network) CreatePrivateKey() (*btcutil.WIF, error) {
	secret, err := btcec.NewPrivateKey(btcec.S256())
	if err != nil {
		return nil, err
	}
	// 注意，在返回wif对象的时候，传入了wif填充对象GetNetworkParams
	return btcutil.NewWIF(secret, network.GetNetworkParams(), true)
}

// GetNetworkParams 根据map配置返回链填充数据
func (network Network) GetNetworkParams() *chaincfg.Params {
	networkParams := &chaincfg.MainNetParams
	networkParams.PubKeyHashAddrID = network.xpubkey
	networkParams.PrivateKeyID = network.xprivatekey
	return networkParams
}

// 获取私钥的wif字符串，Base58格式的字符串
// See DecodeWIF for a detailed breakdown of the format and requirements of
// a valid WIF string.
func (w *WIF) String() string {
	// Precalculate size.  Maximum number of bytes before base58 encoding
	// is one byte for the network, 32 bytes of private key, possibly one
	// extra byte if the pubkey is to be compressed, and finally four
	// bytes of checksum.
	encodeLen := 1 + btcec.PrivKeyBytesLen + 4
	if w.CompressPubKey {
		encodeLen++
	}

	a := make([]byte, 0, encodeLen)
	// 首先填充netID, 也就是填充数据
	a = append(a, w.netID)
	// Pad and append bytes manually, instead of using Serialize, to
	// avoid another call to make.
	// 然后填充私钥二进制数据
	a = paddedAppend(btcec.PrivKeyBytesLen, a, w.PrivKey.D.Bytes())
	if w.CompressPubKey {
		a = append(a, compressMagic)
	}
	// 对数据做校验填充
	cksum := chainhash.DoubleHashB(a)[:4]
	a = append(a, cksum...)
	// 返回最终的Base58字符串
	return base58.Encode(a)
}

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// NewAddressPubKey 获取一个public key
// address.  The serializedPubKey parameter must be a valid pubkey and can be
// uncompressed, compressed, or hybrid.
func NewAddressPubKey(serializedPubKey []byte, net *chaincfg.Params) (*AddressPubKey, error) {
	pubKey, err := btcec.ParsePubKey(serializedPubKey, btcec.S256())
	if err != nil {
		return nil, err
	}

	// Set the format of the pubkey.  This probably should be returned
	// from btcec, but do it here to avoid API churn.  We already know the
	// pubkey is valid since it parsed above, so it's safe to simply examine
	// the leading byte to get the format.
	pkFormat := PKFUncompressed
	switch serializedPubKey[0] {
	case 0x02, 0x03:
		pkFormat = PKFCompressed
	case 0x06, 0x07:
		pkFormat = PKFHybrid
	}

	return &AddressPubKey{
		pubKeyFormat: pkFormat,
		pubKey:       pubKey,
		// 设置地址填充数据
		pubKeyHashID: net.PubKeyHashAddrID,
	}, nil
}

// EncodeAddress returns the string encoding of the public key as a
// pay-to-pubkey-hash.  Note that the public key format (uncompressed,
// compressed, etc) will change the resulting address.  This is expected since
// pay-to-pubkey-hash is a hash of the serialized public key which obviously
// differs with the format.  At the time of this writing, most Bitcoin addresses
// are pay-to-pubkey-hash constructed from the uncompressed public key.
//
// Part of the Address interface.
func (a *AddressPubKey) EncodeAddress() string {
	return encodeAddress(Hash160(a.serialize()), a.pubKeyHashID)
}

// encodeAddress returns a human-readable payment address given a ripemd160 hash
// and netID which encodes the bitcoin network and address type.  It is used
// in both pay-to-pubkey-hash (P2PKH) and pay-to-script-hash (P2SH) address
// encoding.
func encodeAddress(hash160 []byte, netID byte) string {
	// Format is 1 byte for a network and address class (i.e. P2PKH vs
	// P2SH), 20 bytes for a RIPEMD160 hash, and 4 bytes of checksum.
	return base58.CheckEncode(hash160[:ripemd160.Size], netID)
}