package simapp

import (
	"bytes"
	"context"
	"encoding/hex"
	"encoding/json"
	"strconv"
	"testing"

	"github.com/stretchr/testify/require"
	abci "github.com/tendermint/tendermint/abci/types"
	tmjson "github.com/tendermint/tendermint/libs/json"
	"github.com/tendermint/tendermint/libs/log"
	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
	tmtypes "github.com/tendermint/tendermint/types"
	dbm "github.com/tendermint/tm-db"

	"cosmossdk.io/math"
	bam "github.com/cosmos/cosmos-sdk/baseapp"
	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/crypto/keys/ed25519"
	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
	"github.com/cosmos/cosmos-sdk/depinject"
	"github.com/cosmos/cosmos-sdk/server/types"
	"github.com/cosmos/cosmos-sdk/simapp/params"
	"github.com/cosmos/cosmos-sdk/testutil/mock"
	simtestutil "github.com/cosmos/cosmos-sdk/testutil/sims"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/errors"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	bankkeeper "github.com/cosmos/cosmos-sdk/x/bank/keeper"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	minttypes "github.com/cosmos/cosmos-sdk/x/mint/types"
)

// SetupOptions defines arguments that are passed into `Simapp` constructor.
type SetupOptions struct {
	Logger             log.Logger
	DB                 *dbm.MemDB
	InvCheckPeriod     uint
	HomePath           string
	SkipUpgradeHeights map[int64]bool
	EncConfig          params.EncodingConfig
	AppOpts            types.AppOptions
}

func setup(withGenesis bool, invCheckPeriod uint) (*SimApp, GenesisState) {
	db := dbm.NewMemDB()
	encCdc := MakeTestEncodingConfig()
	app := NewSimApp(log.NewNopLogger(), db, nil, true, map[int64]bool{}, DefaultNodeHome, invCheckPeriod, encCdc, EmptyAppOptions{})
	if withGenesis {
		return app, NewDefaultGenesisState(encCdc.Codec)
	}
	return app, GenesisState{}
}

// NewSimappWithCustomOptions initializes a new SimApp with custom options.
func NewSimappWithCustomOptions(t *testing.T, isCheckTx bool, options SetupOptions) *SimApp {
	t.Helper()

	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey(context.TODO())
	require.NoError(t, err)
	// create validator set with single validator
	validator := tmtypes.NewValidator(pubKey, 1)
	valSet := tmtypes.NewValidatorSet([]*tmtypes.Validator{validator})

	// generate genesis account
	senderPrivKey := secp256k1.GenPrivKey()
	acc := authtypes.NewBaseAccount(senderPrivKey.PubKey().Address().Bytes(), senderPrivKey.PubKey(), 0, 0)
	balance := banktypes.Balance{
		Address: acc.GetAddress().String(),
		Coins:   sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100000000000000))),
	}

	app := NewSimApp(options.Logger, options.DB, nil, true, options.SkipUpgradeHeights, options.HomePath, options.InvCheckPeriod, options.EncConfig, options.AppOpts)
	genesisState := NewDefaultGenesisState(app.appCodec)
	genesisState, err = simtestutil.GenesisStateWithValSet(app.AppCodec(), genesisState, valSet, []authtypes.GenesisAccount{acc}, balance)
	require.NoError(t, err)

	if !isCheckTx {
		// init chain must be called to stop deliverState from being nil
		stateBytes, err := tmjson.MarshalIndent(genesisState, "", " ")
		require.NoError(t, err)

		// Initialize the chain
		app.InitChain(
			abci.RequestInitChain{
				Validators:      []abci.ValidatorUpdate{},
				ConsensusParams: simtestutil.DefaultConsensusParams,
				AppStateBytes:   stateBytes,
			},
		)
	}

	return app
}

// Setup initializes a new SimApp. A Nop logger is set in SimApp.
func Setup(t *testing.T, isCheckTx bool) *SimApp {
	t.Helper()

	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey(context.TODO())
	require.NoError(t, err)

	// create validator set with single validator
	validator := tmtypes.NewValidator(pubKey, 1)
	valSet := tmtypes.NewValidatorSet([]*tmtypes.Validator{validator})

	// generate genesis account
	senderPrivKey := secp256k1.GenPrivKey()
	acc := authtypes.NewBaseAccount(senderPrivKey.PubKey().Address().Bytes(), senderPrivKey.PubKey(), 0, 0)
	balance := banktypes.Balance{
		Address: acc.GetAddress().String(),
		Coins:   sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100000000000000))),
	}

	app := SetupWithGenesisValSet(t, valSet, []authtypes.GenesisAccount{acc}, balance)

	return app
}

// SetupWithGenesisValSet initializes a new SimApp with a validator set and genesis accounts
// that also act as delegators. For simplicity, each validator is bonded with a delegation
// of one consensus engine unit in the default token of the simapp from first genesis
// account. A Nop logger is set in SimApp.
func SetupWithGenesisValSet(t *testing.T, valSet *tmtypes.ValidatorSet, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) *SimApp {
	t.Helper()

	app, genesisState := setup(true, 5)
	genesisState, err := simtestutil.GenesisStateWithValSet(app.AppCodec(), genesisState, valSet, genAccs, balances...)
	require.NoError(t, err)

	stateBytes, err := json.MarshalIndent(genesisState, "", " ")
	require.NoError(t, err)

	// init chain will set the validator set and initialize the genesis accounts
	app.InitChain(
		abci.RequestInitChain{
			Validators:      []abci.ValidatorUpdate{},
			ConsensusParams: simtestutil.DefaultConsensusParams,
			AppStateBytes:   stateBytes,
		},
	)

	// commit genesis changes
	app.Commit()
	app.BeginBlock(abci.RequestBeginBlock{Header: tmproto.Header{
		Height:             app.LastBlockHeight() + 1,
		AppHash:            app.LastCommitID().Hash,
		ValidatorsHash:     valSet.Hash(),
		NextValidatorsHash: valSet.Hash(),
	}})

	return app
}

// SetupWithGenesisAccounts initializes a new SimApp with the provided genesis
// accounts and possible balances.
func SetupWithGenesisAccounts(t *testing.T, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) *SimApp {
	t.Helper()

	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey(context.TODO())
	require.NoError(t, err)

	// create validator set with single validator
	validator := tmtypes.NewValidator(pubKey, 1)
	valSet := tmtypes.NewValidatorSet([]*tmtypes.Validator{validator})

	return SetupWithGenesisValSet(t, valSet, genAccs, balances...)
}

// GenesisStateWithSingleValidator initializes GenesisState with a single validator and genesis accounts
// that also act as delegators.
func GenesisStateWithSingleValidator(t *testing.T, app *SimApp) GenesisState {
	t.Helper()

	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey(context.TODO())
	require.NoError(t, err)

	// create validator set with single validator
	validator := tmtypes.NewValidator(pubKey, 1)
	valSet := tmtypes.NewValidatorSet([]*tmtypes.Validator{validator})

	// generate genesis account
	senderPrivKey := secp256k1.GenPrivKey()
	acc := authtypes.NewBaseAccount(senderPrivKey.PubKey().Address().Bytes(), senderPrivKey.PubKey(), 0, 0)
	balances := []banktypes.Balance{
		{
			Address: acc.GetAddress().String(),
			Coins:   sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100000000000000))),
		},
	}

	genesisState := NewDefaultGenesisState(app.appCodec)
	genesisState, err = simtestutil.GenesisStateWithValSet(app.AppCodec(), genesisState, valSet, []authtypes.GenesisAccount{acc}, balances...)
	require.NoError(t, err)

	return genesisState
}

// AddTestAddrsFromPubKeys adds the addresses into the SimApp providing only the public keys.
func AddTestAddrsFromPubKeys(app *SimApp, ctx sdk.Context, pubKeys []cryptotypes.PubKey, accAmt math.Int) {
	initCoins := sdk.NewCoins(sdk.NewCoin(app.StakingKeeper.BondDenom(ctx), accAmt))

	for _, pk := range pubKeys {
		initAccountWithCoins(app, ctx, sdk.AccAddress(pk.Address()), initCoins)
	}
}

// AddTestAddrs constructs and returns accNum amount of accounts with an
// initial balance of accAmt in random order
func AddTestAddrs(app *SimApp, ctx sdk.Context, accNum int, accAmt math.Int) []sdk.AccAddress {
	return addTestAddrs(app, ctx, accNum, accAmt, simtestutil.CreateRandomAccounts)
}

// AddTestAddrsIncremental constructs and returns accNum amount of accounts with an
// initial balance of accAmt in random order
func AddTestAddrsIncremental(app *SimApp, ctx sdk.Context, accNum int, accAmt math.Int) []sdk.AccAddress {
	return addTestAddrs(app, ctx, accNum, accAmt, simtestutil.CreateIncrementalAccounts)
}

func addTestAddrs(app *SimApp, ctx sdk.Context, accNum int, accAmt math.Int, strategy simtestutil.GenerateAccountStrategy) []sdk.AccAddress {
	testAddrs := strategy(accNum)

	initCoins := sdk.NewCoins(sdk.NewCoin(app.StakingKeeper.BondDenom(ctx), accAmt))

	for _, addr := range testAddrs {
		initAccountWithCoins(app, ctx, addr, initCoins)
	}

	return testAddrs
}

func initAccountWithCoins(app *SimApp, ctx sdk.Context, addr sdk.AccAddress, coins sdk.Coins) {
	err := app.BankKeeper.MintCoins(ctx, minttypes.ModuleName, coins)
	if err != nil {
		panic(err)
	}

	err = app.BankKeeper.SendCoinsFromModuleToAccount(ctx, minttypes.ModuleName, addr, coins)
	if err != nil {
		panic(err)
	}
}

// ConvertAddrsToValAddrs converts the provided addresses to ValAddress.
func ConvertAddrsToValAddrs(addrs []sdk.AccAddress) []sdk.ValAddress {
	valAddrs := make([]sdk.ValAddress, len(addrs))

	for i, addr := range addrs {
		valAddrs[i] = sdk.ValAddress(addr)
	}

	return valAddrs
}

// CheckBalance checks the balance of an account.
func CheckBalance(t *testing.T, app *SimApp, addr sdk.AccAddress, balances sdk.Coins) {
	ctxCheck := app.BaseApp.NewContext(true, tmproto.Header{})
	require.True(t, balances.IsEqual(app.BankKeeper.GetAllBalances(ctxCheck, addr)))
}

// SignCheckDeliver checks a generated signed transaction and simulates a
// block commitment with the given transaction. A test assertion is made using
// the parameter 'expPass' against the result. A corresponding result is
// returned.
func SignCheckDeliver(
	t *testing.T, txCfg client.TxConfig, app *bam.BaseApp, header tmproto.Header, msgs []sdk.Msg,
	chainID string, accNums, accSeqs []uint64, expSimPass, expPass bool, priv ...cryptotypes.PrivKey,
) (sdk.GasInfo, *sdk.Result, error) {
	tx, err := simtestutil.GenSignedMockTx(
		txCfg,
		msgs,
		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
		simtestutil.DefaultGenTxGas,
		chainID,
		accNums,
		accSeqs,
		priv...,
	)
	require.NoError(t, err)
	txBytes, err := txCfg.TxEncoder()(tx)
	require.Nil(t, err)

	// Must simulate now as CheckTx doesn't run Msgs anymore
	_, res, err := app.Simulate(txBytes)

	if expSimPass {
		require.NoError(t, err)
		require.NotNil(t, res)
	} else {
		require.Error(t, err)
		require.Nil(t, res)
	}

	// Simulate a sending a transaction and committing a block
	app.BeginBlock(abci.RequestBeginBlock{Header: header})
	gInfo, res, err := app.SimDeliver(txCfg.TxEncoder(), tx)

	if expPass {
		require.NoError(t, err)
		require.NotNil(t, res)
	} else {
		require.Error(t, err)
		require.Nil(t, res)
	}

	app.EndBlock(abci.RequestEndBlock{})
	app.Commit()

	return gInfo, res, err
}

// GenSequenceOfTxs generates a set of signed transactions of messages, such
// that they differ only by having the sequence numbers incremented between
// every transaction.
func GenSequenceOfTxs(txGen client.TxConfig, msgs []sdk.Msg, accNums []uint64, initSeqNums []uint64, numToGenerate int, priv ...cryptotypes.PrivKey) ([]sdk.Tx, error) {
	txs := make([]sdk.Tx, numToGenerate)
	var err error
	for i := 0; i < numToGenerate; i++ {
		txs[i], err = simtestutil.GenSignedMockTx(
			txGen,
			msgs,
			sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
			simtestutil.DefaultGenTxGas,
			"",
			accNums,
			initSeqNums,
			priv...,
		)
		if err != nil {
			break
		}
		incrementAllSequenceNumbers(initSeqNums)
	}

	return txs, err
}

func incrementAllSequenceNumbers(initSeqNums []uint64) {
	for i := 0; i < len(initSeqNums); i++ {
		initSeqNums[i]++
	}
}

// CreateTestPubKeys returns a total of numPubKeys public keys in ascending order.
func CreateTestPubKeys(numPubKeys int) []cryptotypes.PubKey {
	var publicKeys []cryptotypes.PubKey
	var buffer bytes.Buffer

	// start at 10 to avoid changing 1 to 01, 2 to 02, etc
	for i := 100; i < (numPubKeys + 100); i++ {
		numString := strconv.Itoa(i)
		buffer.WriteString("0B485CFC0EECC619440448436F8FC9DF40566F2369E72400281454CB552AF") // base pubkey string
		buffer.WriteString(numString)                                                       // adding on final two digits to make pubkeys unique
		publicKeys = append(publicKeys, NewPubKeyFromHex(buffer.String()))
		buffer.Reset()
	}

	return publicKeys
}

// NewPubKeyFromHex returns a PubKey from a hex string.
func NewPubKeyFromHex(pk string) (res cryptotypes.PubKey) {
	pkBytes, err := hex.DecodeString(pk)
	if err != nil {
		panic(err)
	}
	if len(pkBytes) != ed25519.PubKeySize {
		panic(errors.Wrap(errors.ErrInvalidPubKey, "invalid pubkey size"))
	}
	return &ed25519.PubKey{Key: pkBytes}
}

// EmptyAppOptions is a stub implementing AppOptions
type EmptyAppOptions struct{}

// Get implements AppOptions
func (ao EmptyAppOptions) Get(o string) interface{} {
	return nil
}

// ModuleAccountAddrs provides a list of blocked module accounts from configuration in app.yaml
//
// Ported from SimApp
func ModuleAccountAddrs() map[string]bool {
	var bk bankkeeper.Keeper
	err := depinject.Inject(AppConfig, &bk)
	if err != nil {
		panic("unable to load DI container")
	}
	return bk.GetBlockedAddresses()
}