package keeper_test

import (
	_ "embed"
	"encoding/json"
	"math"
	"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"
	"github.com/cosmos/cosmos-sdk/simapp"
	sdk "github.com/cosmos/cosmos-sdk/types"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
	tmjson "github.com/tendermint/tendermint/libs/json"
	feemarkettypes "github.com/tharsis/ethermint/x/feemarket/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/statedb"
	"github.com/tharsis/ethermint/x/evm/types"

	"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"
	"github.com/ethereum/go-ethereum/params"

	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 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

	enableFeemarket  bool
	enableLondonHF   bool
	mintFeeCollector bool
}

/// 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, use a constant account to keep unit test deterministic.
	ecdsaPriv, err := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
	require.NoError(t, err)
	priv := &ethsecp256k1.PrivKey{
		Key: crypto.FromECDSA(ecdsaPriv),
	}
	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, func(app *app.EthermintApp, genesis simapp.GenesisState) simapp.GenesisState {
		if suite.enableFeemarket {
			feemarketGenesis := feemarkettypes.DefaultGenesisState()
			feemarketGenesis.Params.EnableHeight = 1
			feemarketGenesis.Params.NoBaseFee = false
			feemarketGenesis.BaseFee = sdk.NewInt(feemarketGenesis.Params.InitialBaseFee)
			genesis[feemarkettypes.ModuleName] = app.AppCodec().MustMarshalJSON(feemarketGenesis)
		}
		if !suite.enableLondonHF {
			evmGenesis := types.DefaultGenesisState()
			maxInt := sdk.NewInt(math.MaxInt64)
			evmGenesis.Params.ChainConfig.LondonBlock = &maxInt
			genesis[types.ModuleName] = app.AppCodec().MustMarshalJSON(evmGenesis)
		}
		return genesis
	})

	if suite.mintFeeCollector {
		// mint some coin to fee collector
		coins := sdk.NewCoins(sdk.NewCoin(types.DefaultEVMDenom, sdk.NewInt(int64(params.TxGas)-1)))
		genesisState := app.ModuleBasics.DefaultGenesis(suite.app.AppCodec())
		balances := []banktypes.Balance{
			{
				Address: suite.app.AccountKeeper.GetModuleAddress(authtypes.FeeCollectorName).String(),
				Coins:   coins,
			},
		}
		// update total supply
		bankGenesis := banktypes.NewGenesisState(banktypes.DefaultGenesisState().Params, balances, sdk.NewCoins(sdk.NewCoin(types.DefaultEVMDenom, sdk.NewInt((int64(params.TxGas)-1)))), []banktypes.Metadata{})
		bz := suite.app.AppCodec().MustMarshalJSON(bankGenesis)
		require.NotNil(t, bz)
		genesisState[banktypes.ModuleName] = suite.app.AppCodec().MustMarshalJSON(bankGenesis)

		// we marshal the genesisState of all module to a byte array
		stateBytes, err := tmjson.MarshalIndent(genesisState, "", " ")
		require.NoError(t, err)

		// Initialize the chain
		suite.app.InitChain(
			abci.RequestInitChain{
				ChainId:         "ethermint_9000-1",
				Validators:      []abci.ValidatorUpdate{},
				ConsensusParams: simapp.DefaultConsensusParams,
				AppStateBytes:   stateBytes,
			},
		)
	}

	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")),
	})

	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)

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

func (suite *KeeperTestSuite) StateDB() *statedb.StateDB {
	return statedb.New(suite.ctx, suite.app.EvmKeeper, statedb.NewEmptyTxConfig(common.BytesToHash(suite.ctx.HeaderHash().Bytes())))
}

// 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 := types.ERC20Contract.ABI.Pack("", owner, supply)
	require.NoError(t, err)

	nonce := suite.app.EvmKeeper.GetNonce(suite.ctx, suite.address)

	data := append(types.ERC20Contract.Bin, 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)

	var erc20DeployTx *types.MsgEthereumTx
	if suite.enableFeemarket {
		erc20DeployTx = types.NewTxContract(
			chainID,
			nonce,
			nil,     // amount
			res.Gas, // gasLimit
			nil,     // gasPrice
			suite.app.FeeMarketKeeper.GetBaseFee(suite.ctx),
			big.NewInt(1),
			data,                   // input
			&ethtypes.AccessList{}, // accesses
		)
	} else {
		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 := types.ERC20Contract.ABI.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.ctx, suite.address)

	var ercTransferTx *types.MsgEthereumTx
	if suite.enableFeemarket {
		ercTransferTx = types.NewTx(
			chainID,
			nonce,
			&contractAddr,
			nil,
			res.Gas,
			nil,
			suite.app.FeeMarketKeeper.GetBaseFee(suite.ctx),
			big.NewInt(1),
			transferData,
			&ethtypes.AccessList{}, // accesses
		)
	} else {
		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
}

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

	data := types.TestMessageCall.Bin
	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.ctx, suite.address)

	var erc20DeployTx *types.MsgEthereumTx
	if suite.enableFeemarket {
		erc20DeployTx = types.NewTxContract(
			chainID,
			nonce,
			nil,     // amount
			res.Gas, // gasLimit
			nil,     // gasPrice
			suite.app.FeeMarketKeeper.GetBaseFee(suite.ctx),
			big.NewInt(1),
			data,                   // input
			&ethtypes.AccessList{}, // accesses
		)
	} else {
		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) TestBaseFee() {
	testCases := []struct {
		name            string
		enableLondonHF  bool
		enableFeemarket bool
		expectBaseFee   *big.Int
	}{
		{"not enable london HF, not enable feemarket", false, false, nil},
		{"enable london HF, not enable feemarket", true, false, big.NewInt(0)},
		{"enable london HF, enable feemarket", true, true, big.NewInt(1000000000)},
		{"not enable london HF, enable feemarket", false, true, nil},
	}

	for _, tc := range testCases {
		suite.Run(tc.name, func() {
			suite.enableFeemarket = tc.enableFeemarket
			suite.enableLondonHF = tc.enableLondonHF
			suite.SetupTest()
			suite.app.EvmKeeper.BeginBlock(suite.ctx, abci.RequestBeginBlock{})
			params := suite.app.EvmKeeper.GetParams(suite.ctx)
			ethCfg := params.ChainConfig.EthereumConfig(suite.app.EvmKeeper.ChainID())
			baseFee := suite.app.EvmKeeper.BaseFee(suite.ctx, ethCfg)
			suite.Require().Equal(tc.expectBaseFee, baseFee)
		})
	}
	suite.enableFeemarket = false
	suite.enableLondonHF = true
}

func TestKeeperTestSuite(t *testing.T) {
	suite.Run(t, &KeeperTestSuite{
		enableFeemarket: false,
		enableLondonHF:  true,
	})
}