package testchain

import (
	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
	"github.com/nspcc-dev/neo-go/pkg/io"
	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
)

// privNetKeys is a list of unencrypted WIFs sorted by public key.
var privNetKeys = []string{
	"KzfPUYDC9n2yf4fK5ro4C8KMcdeXtFuEnStycbZgX3GomiUsvX6W",
	"KzgWE3u3EDp13XPXXuTKZxeJ3Gi8Bsm8f9ijY3ZsCKKRvZUo1Cdn",
	"KxyjQ8eUa4FHt3Gvioyt1Wz29cTUrE4eTqX3yFSk1YFCsPL8uNsY",
	"L2oEXKRAAMiPEZukwR5ho2S6SMeQLhcK9mF71ZnF7GvT8dU4Kkgz",
}

var (
	// ids maps validators order by public key sorting to validators ID.
	// which is an order of the validator in the StandByValidators list.
	ids = []int{1, 3, 0, 2}
	// orders maps to validators id to it's order by public key sorting.
	orders = []int{2, 0, 3, 1}
)

// Size returns testchain initial validators amount.
func Size() int {
	return len(privNetKeys)
}

// IDToOrder returns node's order in privnet.
func IDToOrder(id int) int {
	return orders[id]
}

// WIF returns unencrypted wif of the specified validator.
func WIF(i int) string {
	return privNetKeys[i]
}

// PrivateKey returns private key of node #i.
func PrivateKey(i int) *keys.PrivateKey {
	wif := WIF(i)
	priv, err := keys.NewPrivateKeyFromWIF(wif)
	if err != nil {
		panic(err)
	}
	return priv
}

// PrivateKeyByID returns private keys of a node with the specified id.
func PrivateKeyByID(id int) *keys.PrivateKey {
	return PrivateKey(IDToOrder(id))
}

// MultisigVerificationScript returns script hash of the consensus multisig address.
func MultisigVerificationScript() []byte {
	var pubs keys.PublicKeys
	for i := range privNetKeys {
		priv := PrivateKey(ids[i])
		pubs = append(pubs, priv.PublicKey())
	}

	script, err := smartcontract.CreateMultiSigRedeemScript(3, pubs)
	if err != nil {
		panic(err)
	}
	return script
}

// MultisigScriptHash returns consensus address as Uint160.
func MultisigScriptHash() util.Uint160 {
	return hash.Hash160(MultisigVerificationScript())
}

// MultisigAddress return consensus address as string.
func MultisigAddress() string {
	return address.Uint160ToString(MultisigScriptHash())
}

// Sign signs data by all consensus nodes and returns invocation script.
func Sign(data []byte) []byte {
	buf := io.NewBufBinWriter()
	for i := 0; i < Size(); i++ {
		pKey := PrivateKey(i)
		sig := pKey.Sign(data)
		if len(sig) != 64 {
			panic("wrong signature length")
		}
		emit.Bytes(buf.BinWriter, sig)
	}
	return buf.Bytes()
}