package wallet

import (
	"golang.org/x/xerrors"

	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/specs-actors/actors/crypto"

	"github.com/filecoin-project/lotus/chain/types"
	"github.com/filecoin-project/lotus/lib/sigs"
)

func GenerateKey(typ crypto.SigType) (*Key, error) {
	pk, err := sigs.Generate(typ)
	if err != nil {
		return nil, err
	}
	ki := types.KeyInfo{
		Type:       kstoreSigType(typ),
		PrivateKey: pk,
	}
	return NewKey(ki)
}

type Key struct {
	types.KeyInfo

	PublicKey []byte
	Address   address.Address
}

func NewKey(keyinfo types.KeyInfo) (*Key, error) {
	k := &Key{
		KeyInfo: keyinfo,
	}

	var err error
	k.PublicKey, err = sigs.ToPublic(ActSigType(k.Type), k.PrivateKey)
	if err != nil {
		return nil, err
	}

	switch k.Type {
	case KTSecp256k1:
		k.Address, err = address.NewSecp256k1Address(k.PublicKey)
		if err != nil {
			return nil, xerrors.Errorf("converting Secp256k1 to address: %w", err)
		}
	case KTBLS:
		k.Address, err = address.NewBLSAddress(k.PublicKey)
		if err != nil {
			return nil, xerrors.Errorf("converting BLS to address: %w", err)
		}
	default:
		return nil, xerrors.Errorf("unknown key type")
	}
	return k, nil

}

func kstoreSigType(typ crypto.SigType) string {
	switch typ {
	case crypto.SigTypeBLS:
		return KTBLS
	case crypto.SigTypeSecp256k1:
		return KTSecp256k1
	default:
		return ""
	}
}

func ActSigType(typ string) crypto.SigType {
	switch typ {
	case KTBLS:
		return crypto.SigTypeBLS
	case KTSecp256k1:
		return crypto.SigTypeSecp256k1
	default:
		return 0
	}
}