package vaa

import (
	"crypto/ecdsa"
	"crypto/rand"
	"encoding/hex"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/stretchr/testify/require"
	"math/big"
	"testing"
	"time"
)

func TestSerializeDeserialize(t *testing.T) {
	tests := []struct {
		name string
		vaa  *VAA
	}{
		{
			name: "BodyTransfer",
			vaa: &VAA{
				Version:          1,
				GuardianSetIndex: 9,
				Signatures: []*Signature{
					{
						Index:     1,
						Signature: [65]byte{},
					},
				},
				Timestamp: time.Unix(2837, 0),
				Payload: &BodyTransfer{
					Nonce:         38,
					SourceChain:   2,
					TargetChain:   1,
					SourceAddress: Address{2, 1, 4},
					TargetAddress: Address{2, 1, 3},
					Asset: &AssetMeta{
						Chain:   9,
						Address: Address{9, 2, 4},
					},
					Amount: big.NewInt(29),
				},
			},
		},
		{
			name: "GuardianSetUpdate",
			vaa: &VAA{
				Version:          1,
				GuardianSetIndex: 9,
				Signatures: []*Signature{
					{
						Index:     1,
						Signature: [65]byte{},
					},
				},
				Timestamp: time.Unix(2837, 0),
				Payload: &BodyGuardianSetUpdate{
					Keys:     []common.Address{{}, {}},
					NewIndex: 2,
				},
			},
		},
		{
			name: "ContractUpgrade",
			vaa: &VAA{
				Version:          1,
				GuardianSetIndex: 9,
				Signatures: []*Signature{
					{
						Index:     1,
						Signature: [65]byte{},
					},
				},
				Timestamp: time.Unix(2837, 0),
				Payload: &BodyContractUpgrade{
					ChainID:     ChainIDEthereum,
					NewContract: Address{1, 3, 4, 5, 2, 3},
				},
			},
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {

			vaaData, err := test.vaa.Marshal()
			require.NoError(t, err)

			println(hex.EncodeToString(vaaData))
			vaaParsed, err := Unmarshal(vaaData)
			require.NoError(t, err)

			require.EqualValues(t, test.vaa, vaaParsed)
		})
	}
}

func TestVerifySignature(t *testing.T) {
	v := &VAA{
		Version:          8,
		GuardianSetIndex: 9,
		Timestamp:        time.Unix(2837, 0),
		Payload: &BodyTransfer{
			SourceChain:   2,
			TargetChain:   1,
			TargetAddress: Address{2, 1, 3},
			Asset: &AssetMeta{
				Chain:   9,
				Address: Address{9, 2, 4},
			},
			Amount: big.NewInt(29),
		},
	}

	data, err := v.SigningMsg()
	require.NoError(t, err)

	key, err := ecdsa.GenerateKey(crypto.S256(), rand.Reader)
	require.NoError(t, err)

	sig, err := crypto.Sign(data.Bytes(), key)
	require.NoError(t, err)
	sigData := [65]byte{}
	copy(sigData[:], sig)

	v.Signatures = append(v.Signatures, &Signature{
		Index:     0,
		Signature: sigData,
	})
	addr := crypto.PubkeyToAddress(key.PublicKey)
	require.True(t, v.VerifySignatures([]common.Address{
		addr,
	}))
}