// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.

package evm

import (
	"encoding/json"
	"testing"

	"github.com/ava-labs/avalanchego/api/keystore"
	"github.com/ava-labs/avalanchego/chains/atomic"
	"github.com/ava-labs/avalanchego/database/memdb"
	"github.com/ava-labs/avalanchego/database/prefixdb"
	"github.com/ava-labs/avalanchego/ids"
	"github.com/ava-labs/avalanchego/snow"
	engCommon "github.com/ava-labs/avalanchego/snow/engine/common"
	"github.com/ava-labs/avalanchego/utils/crypto"
	"github.com/ava-labs/avalanchego/utils/formatting"
	"github.com/ava-labs/avalanchego/utils/logging"
	"github.com/ava-labs/coreth/core"
	"github.com/ethereum/go-ethereum/common"
)

var (
	testNetworkID    uint32 = 10
	testCChainID            = ids.ID{'c', 'c', 'h', 'a', 'i', 'n', 't', 'e', 's', 't'}
	testXChainID            = ids.ID{'t', 'e', 's', 't', 'x'}
	nonExistentID           = ids.ID{'F'}
	testTxFee               = uint64(1000)
	testKeys         []*crypto.PrivateKeySECP256K1R
	testEthAddrs     []common.Address // testEthAddrs[i] corresponds to testKeys[i]
	testShortIDAddrs []ids.ShortID
	testAvaxAssetID  = ids.ID{1, 2, 3}
	username         = "Johns"
	password         = "CjasdjhiPeirbSenfeI13" // #nosec G101
)

func init() {
	var b []byte
	factory := crypto.FactorySECP256K1R{}

	for _, key := range []string{
		"24jUJ9vZexUM6expyMcT48LBx27k1m7xpraoV62oSQAHdziao5",
		"2MMvUMsxx6zsHSNXJdFD8yc5XkancvwyKPwpw4xUK3TCGDuNBY",
		"cxb7KpGWhDMALTjNNSJ7UQkkomPesyWAPUaWRGdyeBNzR6f35",
	} {
		b, _ = formatting.Decode(formatting.CB58, key)
		pk, _ := factory.ToPrivateKey(b)
		secpKey := pk.(*crypto.PrivateKeySECP256K1R)
		testKeys = append(testKeys, secpKey)
		testEthAddrs = append(testEthAddrs, GetEthAddress(secpKey))
		testShortIDAddrs = append(testShortIDAddrs, pk.PublicKey().Address())
	}
}

// BuildGenesisTest returns the genesis bytes for Coreth VM to be used in testing
func BuildGenesisTest(t *testing.T) []byte {
	ss := StaticService{}

	genesisJSON := "{\"config\":{\"chainId\":43112,\"homesteadBlock\":0,\"daoForkBlock\":0,\"daoForkSupport\":true,\"eip150Block\":0,\"eip150Hash\":\"0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0\",\"eip155Block\":0,\"eip158Block\":0,\"byzantiumBlock\":0,\"constantinopleBlock\":0,\"petersburgBlock\":0,\"istanbulBlock\":0,\"muirGlacierBlock\":0},\"nonce\":\"0x0\",\"timestamp\":\"0x0\",\"extraData\":\"0x00\",\"gasLimit\":\"0x5f5e100\",\"difficulty\":\"0x0\",\"mixHash\":\"0x0000000000000000000000000000000000000000000000000000000000000000\",\"coinbase\":\"0x0000000000000000000000000000000000000000\",\"alloc\":{\"0100000000000000000000000000000000000000\":{\"code\":\"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\",\"balance\":\"0x0\"}},\"number\":\"0x0\",\"gasUsed\":\"0x0\",\"parentHash\":\"0x0000000000000000000000000000000000000000000000000000000000000000\"}"

	genesis := &core.Genesis{}
	if err := json.Unmarshal([]byte(genesisJSON), genesis); err != nil {
		t.Fatalf("Problem unmarshaling genesis JSON: %s", err)
	}
	genesisBytes, err := ss.BuildGenesis(nil, genesis)
	if err != nil {
		t.Fatalf("Failed to create test genesis")
	}
	return genesisBytes
}

func NewContext() *snow.Context {
	ctx := snow.DefaultContextTest()
	ctx.NetworkID = testNetworkID
	ctx.ChainID = testCChainID
	ctx.AVAXAssetID = testAvaxAssetID
	ctx.XChainID = ids.Empty.Prefix(0)
	aliaser := ctx.BCLookup.(*ids.Aliaser)
	_ = aliaser.Alias(testCChainID, "C")
	_ = aliaser.Alias(testCChainID, testCChainID.String())
	_ = aliaser.Alias(testXChainID, "X")
	_ = aliaser.Alias(testXChainID, testXChainID.String())

	// SNLookup might be required here???
	return ctx
}

// GenesisVM creates a VM instance with the genesis test bytes and returns
// the channel use to send messages to the engine, the vm, and atomic memory
func GenesisVM(t *testing.T, finishBootstrapping bool) (chan engCommon.Message, *VM, []byte, *atomic.Memory) {
	genesisBytes := BuildGenesisTest(t)
	ctx := NewContext()

	baseDB := memdb.New()

	m := &atomic.Memory{}
	m.Initialize(logging.NoLog{}, prefixdb.New([]byte{0}, baseDB))
	ctx.SharedMemory = m.NewSharedMemory(ctx.ChainID)

	// NB: this lock is intentionally left locked when this function returns.
	// The caller of this function is responsible for unlocking.
	ctx.Lock.Lock()

	userKeystore, err := keystore.CreateTestKeystore()
	if err != nil {
		t.Fatal(err)
	}
	if err := userKeystore.AddUser(username, password); err != nil {
		t.Fatal(err)
	}
	ctx.Keystore = userKeystore.NewBlockchainKeyStore(ctx.ChainID)

	issuer := make(chan engCommon.Message, 1)
	vm := &VM{
		txFee: testTxFee,
	}
	err = vm.Initialize(
		ctx,
		prefixdb.New([]byte{1}, baseDB),
		genesisBytes,
		issuer,
		[]*engCommon.Fx{},
	)
	if err != nil {
		t.Fatal(err)
	}

	return issuer, vm, genesisBytes, m
}

func TestVMGenesis(t *testing.T) {
	_, _, _, _ = GenesisVM(t, true)
}