package polis

import (
	"github.com/martinboehm/btcd/wire"
	"github.com/martinboehm/btcutil/chaincfg"
	"github.com/trezor/blockbook/bchain/coins/btc"
)

// magic numbers
const (
	MainnetMagic wire.BitcoinNet = 0xbd6b0cbf
	TestnetMagic wire.BitcoinNet = 0xffcae2ce
	RegtestMagic wire.BitcoinNet = 0xdcb7c1fc
)

// chain parameters
var (
	MainNetParams chaincfg.Params
	TestNetParams chaincfg.Params
	RegtestParams chaincfg.Params
)

func init() {
	MainNetParams = chaincfg.MainNetParams
	MainNetParams.Net = MainnetMagic

	// Address encoding magics
	MainNetParams.PubKeyHashAddrID = []byte{55} // base58 prefix: P
	MainNetParams.ScriptHashAddrID = []byte{56} // base58 prefix: 3

	TestNetParams = chaincfg.TestNet3Params
	TestNetParams.Net = TestnetMagic

	// Address encoding magics
	TestNetParams.PubKeyHashAddrID = []byte{140} // base58 prefix: y
	TestNetParams.ScriptHashAddrID = []byte{19}  // base58 prefix: 8 or 9

	RegtestParams = chaincfg.RegressionNetParams
	RegtestParams.Net = RegtestMagic

	// Address encoding magics
	RegtestParams.PubKeyHashAddrID = []byte{140} // base58 prefix: y
	RegtestParams.ScriptHashAddrID = []byte{19}  // base58 prefix: 8 or 9
}

// PolisParser handle
type PolisParser struct {
	*btc.BitcoinParser
}

// NewPolisParser returns new PolisParser instance
func NewPolisParser(params *chaincfg.Params, c *btc.Configuration) *PolisParser {
	return &PolisParser{BitcoinParser: btc.NewBitcoinParser(params, c)}
}

// GetChainParams contains network parameters for the main Polis network,
// the regression test Polis network, the test Polis network and
// the simulation test Polis network, in this order
func GetChainParams(chain string) *chaincfg.Params {
	if !chaincfg.IsRegistered(&MainNetParams) {
		err := chaincfg.Register(&MainNetParams)
		if err == nil {
			err = chaincfg.Register(&TestNetParams)
		}
		if err == nil {
			err = chaincfg.Register(&RegtestParams)
		}
		if err != nil {
			panic(err)
		}
	}
	switch chain {
	case "test":
		return &TestNetParams
	case "regtest":
		return &RegtestParams
	default:
		return &MainNetParams
	}
}