package keeper_test

import (
	_ "embed"
	"encoding/json"
	"math/big"
	"testing"
	"time"

	"github.com/stretchr/testify/require"
	"github.com/stretchr/testify/suite"

	"github.com/cosmos/cosmos-sdk/baseapp"
	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	"github.com/cosmos/cosmos-sdk/crypto/keyring"
	sdk "github.com/cosmos/cosmos-sdk/types"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"

	"github.com/tharsis/ethermint/app"
	"github.com/tharsis/ethermint/crypto/ethsecp256k1"
	"github.com/tharsis/ethermint/encoding"
	"github.com/tharsis/ethermint/server/config"
	"github.com/tharsis/ethermint/tests"
	ethermint "github.com/tharsis/ethermint/types"
	"github.com/tharsis/ethermint/x/evm/types"

	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	ethtypes "github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"

	abci "github.com/tendermint/tendermint/abci/types"
	"github.com/tendermint/tendermint/crypto/tmhash"
	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
	tmversion "github.com/tendermint/tendermint/proto/tendermint/version"
	"github.com/tendermint/tendermint/version"
)

var (
	//go:embed ERC20Contract.json
	compiledContractJSON []byte
	ContractBin          []byte
	ContractABI          abi.ABI
)

func init() {
	var tmp struct {
		Abi string
		Bin string
	}
	err := json.Unmarshal(compiledContractJSON, &tmp)
	if err != nil {
		panic(err)
	}
	ContractBin = common.FromHex(tmp.Bin)
	err = json.Unmarshal([]byte(tmp.Abi), &ContractABI)
	if err != nil {
		panic(err)
	}
}

var testTokens = sdk.NewIntWithDecimal(1000, 18)

type KeeperTestSuite struct {
	suite.Suite

	ctx         sdk.Context
	app         *app.EthermintApp
	queryClient types.QueryClient
	address     common.Address
	consAddress sdk.ConsAddress

	// for generate test tx
	clientCtx client.Context
	ethSigner ethtypes.Signer

	appCodec codec.Codec
	signer   keyring.Signer
}

/// DoSetupTest setup test environment, it uses`require.TestingT` to support both `testing.T` and `testing.B`.
func (suite *KeeperTestSuite) DoSetupTest(t require.TestingT) {
	checkTx := false

	// account key
	priv, err := ethsecp256k1.GenerateKey()
	require.NoError(t, err)
	suite.address = common.BytesToAddress(priv.PubKey().Address().Bytes())
	suite.signer = tests.NewSigner(priv)

	// consensus key
	priv, err = ethsecp256k1.GenerateKey()
	require.NoError(t, err)
	suite.consAddress = sdk.ConsAddress(priv.PubKey().Address())

	suite.app = app.Setup(checkTx)
	suite.ctx = suite.app.BaseApp.NewContext(checkTx, tmproto.Header{
		Height:          1,
		ChainID:         "ethermint_9000-1",
		Time:            time.Now().UTC(),
		ProposerAddress: suite.consAddress.Bytes(),
		Version: tmversion.Consensus{
			Block: version.BlockProtocol,
		},
		LastBlockId: tmproto.BlockID{
			Hash: tmhash.Sum([]byte("block_id")),
			PartSetHeader: tmproto.PartSetHeader{
				Total: 11,
				Hash:  tmhash.Sum([]byte("partset_header")),
			},
		},
		AppHash:            tmhash.Sum([]byte("app")),
		DataHash:           tmhash.Sum([]byte("data")),
		EvidenceHash:       tmhash.Sum([]byte("evidence")),
		ValidatorsHash:     tmhash.Sum([]byte("validators")),
		NextValidatorsHash: tmhash.Sum([]byte("next_validators")),
		ConsensusHash:      tmhash.Sum([]byte("consensus")),
		LastResultsHash:    tmhash.Sum([]byte("last_result")),
	})
	suite.app.EvmKeeper.WithContext(suite.ctx)

	queryHelper := baseapp.NewQueryServerTestHelper(suite.ctx, suite.app.InterfaceRegistry())
	types.RegisterQueryServer(queryHelper, suite.app.EvmKeeper)
	suite.queryClient = types.NewQueryClient(queryHelper)

	acc := &ethermint.EthAccount{
		BaseAccount: authtypes.NewBaseAccount(sdk.AccAddress(suite.address.Bytes()), nil, 0, 0),
		CodeHash:    common.BytesToHash(crypto.Keccak256(nil)).String(),
	}

	suite.app.AccountKeeper.SetAccount(suite.ctx, acc)

	valAddr := sdk.ValAddress(suite.address.Bytes())
	validator, err := stakingtypes.NewValidator(valAddr, priv.PubKey(), stakingtypes.Description{})
	err = suite.app.StakingKeeper.SetValidatorByConsAddr(suite.ctx, validator)
	require.NoError(t, err)
	err = suite.app.StakingKeeper.SetValidatorByConsAddr(suite.ctx, validator)
	require.NoError(t, err)
	suite.app.StakingKeeper.SetValidator(suite.ctx, validator)

	encodingConfig := encoding.MakeConfig(app.ModuleBasics)
	suite.clientCtx = client.Context{}.WithTxConfig(encodingConfig.TxConfig)
	suite.ethSigner = ethtypes.LatestSignerForChainID(suite.app.EvmKeeper.ChainID())
	suite.appCodec = encodingConfig.Marshaler
}

func (suite *KeeperTestSuite) SetupTest() {
	suite.DoSetupTest(suite.T())
}

func (suite *KeeperTestSuite) EvmDenom() string {
	ctx := sdk.WrapSDKContext(suite.ctx)
	rsp, _ := suite.queryClient.Params(ctx, &types.QueryParamsRequest{})
	return rsp.Params.EvmDenom
}

// Commit and begin new block
func (suite *KeeperTestSuite) Commit() {
	_ = suite.app.Commit()
	header := suite.ctx.BlockHeader()
	header.Height += 1
	suite.app.BeginBlock(abci.RequestBeginBlock{
		Header: header,
	})

	// update ctx
	suite.ctx = suite.app.BaseApp.NewContext(false, header)
	suite.app.EvmKeeper.WithContext(suite.ctx)

	queryHelper := baseapp.NewQueryServerTestHelper(suite.ctx, suite.app.InterfaceRegistry())
	types.RegisterQueryServer(queryHelper, suite.app.EvmKeeper)
	suite.queryClient = types.NewQueryClient(queryHelper)
}

// DeployTestContract deploy a test erc20 contract and returns the contract address
func (suite *KeeperTestSuite) DeployTestContract(t require.TestingT, owner common.Address, supply *big.Int) common.Address {
	ctx := sdk.WrapSDKContext(suite.ctx)
	chainID := suite.app.EvmKeeper.ChainID()

	ctorArgs, err := ContractABI.Pack("", owner, supply)
	require.NoError(t, err)

	data := append(ContractBin, ctorArgs...)
	args, err := json.Marshal(&types.TransactionArgs{
		From: &suite.address,
		Data: (*hexutil.Bytes)(&data),
	})
	require.NoError(t, err)

	res, err := suite.queryClient.EstimateGas(ctx, &types.EthCallRequest{
		Args:   args,
		GasCap: uint64(config.DefaultGasCap),
	})
	require.NoError(t, err)

	nonce := suite.app.EvmKeeper.GetNonce(suite.address)
	erc20DeployTx := types.NewTxContract(
		chainID,
		nonce,
		nil,     // amount
		res.Gas, // gasLimit
		nil,     // gasPrice
		nil, nil,
		data, // input
		nil,  // accesses
	)
	erc20DeployTx.From = suite.address.Hex()
	err = erc20DeployTx.Sign(ethtypes.LatestSignerForChainID(chainID), suite.signer)
	require.NoError(t, err)
	rsp, err := suite.app.EvmKeeper.EthereumTx(ctx, erc20DeployTx)
	require.NoError(t, err)
	require.Empty(t, rsp.VmError)
	return crypto.CreateAddress(suite.address, nonce)
}

func (suite *KeeperTestSuite) TransferERC20Token(t require.TestingT, contractAddr, from, to common.Address, amount *big.Int) *types.MsgEthereumTx {
	ctx := sdk.WrapSDKContext(suite.ctx)
	chainID := suite.app.EvmKeeper.ChainID()

	transferData, err := ContractABI.Pack("transfer", to, amount)
	require.NoError(t, err)
	args, err := json.Marshal(&types.TransactionArgs{To: &contractAddr, From: &from, Data: (*hexutil.Bytes)(&transferData)})
	require.NoError(t, err)
	res, err := suite.queryClient.EstimateGas(ctx, &types.EthCallRequest{
		Args:   args,
		GasCap: 25_000_000,
	})
	require.NoError(t, err)

	nonce := suite.app.EvmKeeper.GetNonce(suite.address)
	ercTransferTx := types.NewTx(
		chainID,
		nonce,
		&contractAddr,
		nil,
		res.Gas,
		nil,
		nil, nil,
		transferData,
		nil,
	)
	ercTransferTx.From = suite.address.Hex()
	err = ercTransferTx.Sign(ethtypes.LatestSignerForChainID(chainID), suite.signer)
	require.NoError(t, err)
	rsp, err := suite.app.EvmKeeper.EthereumTx(ctx, ercTransferTx)
	require.NoError(t, err)
	require.Empty(t, rsp.VmError)
	return ercTransferTx
}

func TestKeeperTestSuite(t *testing.T) {
	suite.Run(t, new(KeeperTestSuite))
}