package app

import (
	"context"
	"encoding/json"
	"testing"
	"time"

	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	cryptocodec "github.com/cosmos/cosmos-sdk/crypto/codec"
	"github.com/cosmos/cosmos-sdk/server/types"
	"github.com/cosmos/cosmos-sdk/simapp"
	"github.com/cosmos/cosmos-sdk/testutil/mock"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"

	"github.com/cosmos/cosmos-sdk/simapp/params"
	"github.com/stretchr/testify/require"
	tmjson "github.com/tendermint/tendermint/libs/json"
	"github.com/tharsis/ethermint/crypto/ethsecp256k1"
	"github.com/tharsis/ethermint/encoding"
	ethermint "github.com/tharsis/ethermint/types"

	"github.com/cosmos/cosmos-sdk/db/memdb"
	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"
	abci "github.com/tendermint/tendermint/abci/types"
	"github.com/tendermint/tendermint/crypto/ed25519"
	"github.com/tendermint/tendermint/libs/log"
	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
	tmtypes "github.com/tendermint/tendermint/types"
)

// GenesisState of the blockchain is represented here as a map of raw json
// messages key'd by a identifier string.
// The identifier is used to determine which module genesis information belongs
// to so it may be appropriately routed during init chain.
// Within this application default genesis information is retrieved from
// the ModuleBasicManager which populates json from each BasicModule
// object provided to it during init.

// DefaultConsensusParams defines the default Tendermint consensus params used in
// EthermintApp testing.
var DefaultConsensusParams = &tmproto.ConsensusParams{
	Block: &tmproto.BlockParams{
		MaxBytes: 200000,
		MaxGas:   -1, // no limit
	},
	Evidence: &tmproto.EvidenceParams{
		MaxAgeNumBlocks: 302400,
		MaxAgeDuration:  504 * time.Hour, // 3 weeks is the max duration
		MaxBytes:        10000,
	},
	Validator: &tmproto.ValidatorParams{
		PubKeyTypes: []string{
			tmtypes.ABCIPubKeyTypeEd25519,
		},
	},
}

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

func NewTestAppWithCustomOptions(t *testing.T, isCheckTx bool, options SetupOptions) *EthermintApp {
	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
	priv, err := ethsecp256k1.GenerateKey()
	require.NoError(t, err)
	address := common.BytesToAddress(priv.PubKey().Address().Bytes())

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

	balance := banktypes.Balance{
		Address: acc.GetAddress().String(),
		Coins:   sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100000000000000))),
	}

	app := NewEthermintApp(options.Logger, options.DB, nil, true, options.SkipUpgradeHeights, options.HomePath, options.InvCheckPeriod, options.EncConfig, options.AppOpts)
	genesisState := NewDefaultGenesisState(app.appCodec)
	genesisState = genesisStateWithValSet(t, app, genesisState, valSet, []authtypes.GenesisAccount{acc}, balance)

	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{
				ChainId:         "ethermint_9000-1",
				Validators:      []abci.ValidatorUpdate{},
				ConsensusParams: DefaultConsensusParams,
				AppStateBytes:   stateBytes,
			},
		)
	}

	return app
}

// Setup initializes a new EthermintApp. A Nop logger is set in EthermintApp.
func Setup(t *testing.T, isCheckTx bool, patchGenesis func(*EthermintApp, simapp.GenesisState) simapp.GenesisState) *EthermintApp {
	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})

	priv, err := ethsecp256k1.GenerateKey()
	require.NoError(t, err)
	address := common.BytesToAddress(priv.PubKey().Address().Bytes())

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

	balance := banktypes.Balance{
		Address: acc.GetAddress().String(),
		Coins:   sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100000000000000))),
	}

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

	return app
}

func setup(withGenesis bool, invCheckPeriod uint, patchGenesis func(*EthermintApp, simapp.GenesisState) simapp.GenesisState) (*EthermintApp, simapp.GenesisState) {
	encCdc := encoding.MakeConfig(ModuleBasics)
	app := NewEthermintApp(log.NewNopLogger(), memdb.NewDB(), nil, true, map[int64]bool{}, DefaultNodeHome, invCheckPeriod, encCdc, EmptyAppOptions{})
	if withGenesis {
		genesisState := NewDefaultGenesisState(encCdc.Codec)
		if patchGenesis != nil {
			genesisState = patchGenesis(app, genesisState)
		}
		return app, genesisState
	}

	return app, simapp.GenesisState{}
}

// 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, patchGenesis func(*EthermintApp, simapp.GenesisState) simapp.GenesisState, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) *EthermintApp {
	t.Helper()

	app, genesisState := setup(true, 5, patchGenesis)
	genesisState = genesisStateWithValSet(t, app, genesisState, valSet, genAccs, balances...)

	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{
			ChainId:         "ethermint_9000-1",
			Validators:      []abci.ValidatorUpdate{},
			ConsensusParams: DefaultConsensusParams,
			AppStateBytes:   stateBytes,
		},
	)

	// commit genesis changes
	// app.Commit()
	// app.BeginBlock(abci.RequestBeginBlock{Header: tmproto.Header{
	// 	ChainID:            "ethermint_9000-1",
	// 	Height:             app.LastBlockHeight() + 1,
	// 	AppHash:            app.LastCommitID().Hash,
	// 	ValidatorsHash:     valSet.Hash(),
	// 	NextValidatorsHash: valSet.Hash(),
	// }})

	return app
}

func genesisStateWithValSet(t *testing.T, app *EthermintApp, genesisState simapp.GenesisState,
	valSet *tmtypes.ValidatorSet, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance,
) simapp.GenesisState {
	// set genesis accounts
	authGenesis := authtypes.NewGenesisState(authtypes.DefaultParams(), genAccs)
	genesisState[authtypes.ModuleName] = app.AppCodec().MustMarshalJSON(authGenesis)

	validators := make([]stakingtypes.Validator, 0, len(valSet.Validators))
	delegations := make([]stakingtypes.Delegation, 0, len(valSet.Validators))

	bondAmt := sdk.DefaultPowerReduction

	for _, val := range valSet.Validators {
		pk, err := cryptocodec.FromTmPubKeyInterface(val.PubKey)
		require.NoError(t, err)
		pkAny, err := codectypes.NewAnyWithValue(pk)
		require.NoError(t, err)
		validator := stakingtypes.Validator{
			OperatorAddress:   sdk.ValAddress(val.Address).String(),
			ConsensusPubkey:   pkAny,
			Jailed:            false,
			Status:            stakingtypes.Bonded,
			Tokens:            bondAmt,
			DelegatorShares:   sdk.OneDec(),
			Description:       stakingtypes.Description{},
			UnbondingHeight:   int64(0),
			UnbondingTime:     time.Unix(0, 0).UTC(),
			Commission:        stakingtypes.NewCommission(sdk.ZeroDec(), sdk.ZeroDec(), sdk.ZeroDec()),
			MinSelfDelegation: sdk.ZeroInt(),
		}
		validators = append(validators, validator)
		delegations = append(delegations, stakingtypes.NewDelegation(genAccs[0].GetAddress(), val.Address.Bytes(), sdk.OneDec()))
	}
	// set validators and delegations
	stakingGenesis := stakingtypes.NewGenesisState(stakingtypes.DefaultParams(), validators, delegations)
	genesisState[stakingtypes.ModuleName] = app.AppCodec().MustMarshalJSON(stakingGenesis)

	totalSupply := sdk.NewCoins()
	for _, b := range balances {
		// add genesis acc tokens to total supply
		totalSupply = totalSupply.Add(b.Coins...)
	}

	for range delegations {
		// add delegated tokens to total supply
		totalSupply = totalSupply.Add(sdk.NewCoin(sdk.DefaultBondDenom, bondAmt))
	}

	// add bonded amount to bonded pool module account
	balances = append(balances, banktypes.Balance{
		Address: authtypes.NewModuleAddress(stakingtypes.BondedPoolName).String(),
		Coins:   sdk.Coins{sdk.NewCoin(sdk.DefaultBondDenom, bondAmt)},
	})

	// update total supply
	bankGenesis := banktypes.NewGenesisState(banktypes.DefaultGenesisState().Params, balances, totalSupply, []banktypes.Metadata{})
	genesisState[banktypes.ModuleName] = app.AppCodec().MustMarshalJSON(bankGenesis)

	return genesisState
}

// CreateRandomAccounts will generate random accounts
func CreateRandomAccounts(accNum int) []sdk.AccAddress {
	// createRandomAccounts is a strategy used by addTestAddrs() in order to generated addresses in random order.
	testAddrs := make([]sdk.AccAddress, accNum)
	for i := 0; i < accNum; i++ {
		pk := ed25519.GenPrivKey().PubKey()
		testAddrs[i] = sdk.AccAddress(pk.Address())
	}

	return testAddrs
}

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

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