package app

import (
	"bytes"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"math/rand"
	"reflect"
	"strconv"
	"time"

	"cosmossdk.io/log"
	abci "github.com/cometbft/cometbft/abci/types"
	cmtjson "github.com/cometbft/cometbft/libs/json"
	tmproto "github.com/cometbft/cometbft/proto/tendermint/types"
	cmttypes "github.com/cometbft/cometbft/types"
	dbm "github.com/cosmos/cosmos-db"

	errorsmod "cosmossdk.io/errors"
	sdkmath "cosmossdk.io/math"
	"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/server/types"
	"github.com/cosmos/cosmos-sdk/testutil/mock"
	simtestutil "github.com/cosmos/cosmos-sdk/testutil/sims"
	sdk "github.com/cosmos/cosmos-sdk/types"
	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"

	moduletestutil "github.com/cosmos/cosmos-sdk/types/module/testutil"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
	minttypes "github.com/cosmos/cosmos-sdk/x/mint/types"

	// cheqd specific imports
	didtypes "github.com/cheqd/cheqd-node/x/did/types"
)

type TestApp struct {
	App
}

// DefaultConsensusParams defines the default Tendermint consensus params used in
// SimApp testing.
var DefaultConsensusParams = &tmproto.ConsensusParams{
	Block: &tmproto.BlockParams{
		MaxBytes: 200000,
		MaxGas:   2000000,
	},
	Evidence: &tmproto.EvidenceParams{
		MaxAgeNumBlocks: 302400,
		MaxAgeDuration:  504 * time.Hour, // 3 weeks is the max duration
		MaxBytes:        10000,
	},
	Validator: &tmproto.ValidatorParams{
		PubKeyTypes: []string{
			cmttypes.ABCIPubKeyTypeEd25519,
		},
	},
}

// 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          moduletestutil.TestEncodingConfig
	AppOpts            types.AppOptions
}

func setup(withGenesis bool, invCheckPeriod uint) (*TestApp, GenesisState) {
	db := dbm.NewMemDB()
	app := New(log.NewNopLogger(), db, nil, true, EmptyAppOptions{})
	if withGenesis {
		return &TestApp{App: *app}, app.DefaultGenesis()
	}
	return &TestApp{*app}, GenesisState{}
}

// NewAppWithCustomOptions initializes a new App with custom options.
func NewAppWithCustomOptions(isCheckTx bool, options SetupOptions) (*TestApp, error) {
	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey()
	if err != nil {
		return nil, err
	}
	// create validator set with single validator
	validator := cmttypes.NewValidator(pubKey, 1)
	valSet := cmttypes.NewValidatorSet([]*cmttypes.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, sdkmath.NewInt(100000000000000))),
	}

	app := New(options.Logger, options.DB, nil, true, options.AppOpts)
	genesisState := app.DefaultGenesis()
	genesisState, err = simtestutil.GenesisStateWithValSet(app.AppCodec(), genesisState, valSet, []authtypes.GenesisAccount{acc}, balance)
	if err != nil {
		return nil, err
	}

	if !isCheckTx {
		// init chain must be called to stop deliverState from being nil
		stateBytes, err := cmtjson.MarshalIndent(genesisState, "", " ")
		if err != nil {
			return nil, err
		}

		// Initialize the chain
		_, err = app.InitChain(
			&abci.RequestInitChain{
				Validators:      []abci.ValidatorUpdate{},
				ConsensusParams: DefaultConsensusParams,
				AppStateBytes:   stateBytes,
			},
		)
		if err != nil {
			return nil, err
		}
	}

	return &TestApp{*app}, nil
}

// Setup initializes a new SimApp. A Nop logger is set in SimApp.
func Setup(isCheckTx bool) (*TestApp, error) {
	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey()
	if err != nil {
		return nil, err
	}

	// create validator set with single validator
	validator := cmttypes.NewValidator(pubKey, 1)
	valSet := cmttypes.NewValidatorSet([]*cmttypes.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(didtypes.BaseMinimalDenom, sdkmath.NewInt(100000000000000))),
	}

	app, err := SetupWithGenesisValSet(valSet, []authtypes.GenesisAccount{acc}, balance)
	if err != nil {
		return nil, err
	}

	return app, nil
}

// func genesisStateWithValSet(
// 	app *TestApp, genesisState GenesisState,
// 	valSet *cmttypes.ValidatorSet, genAccs []authtypes.GenesisAccount,
// 	balances ...banktypes.Balance,
// ) (GenesisState, error) {
// 	// 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)
// 		if err != nil {
// 			return nil, err
// 		}
// 		pkAny, err := codectypes.NewAnyWithValue(pk)
// 		if err != nil {
// 			return nil, 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{}, []banktypes.SendEnabled{})
// 	genesisState[banktypes.ModuleName] = app.AppCodec().MustMarshalJSON(bankGenesis)

// 	// set did module genesis state
// 	didGenesis := didtypes.DefaultGenesis()
// 	genesisState[didtypes.ModuleName] = app.AppCodec().MustMarshalJSON(didGenesis)

// 	// set resource module genesis state
// 	resourceGenesis := resourcetypes.DefaultGenesis()
// 	genesisState[resourcetypes.ModuleName] = app.AppCodec().MustMarshalJSON(resourceGenesis)

// 	return genesisState, nil
// }

// 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(valSet *cmttypes.ValidatorSet, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) (*TestApp, error) {
	app, genesisState := setup(true, 5)
	genesisState, err := simtestutil.GenesisStateWithValSet(app.AppCodec(), genesisState, valSet, genAccs, balances...)
	if err != nil {
		return nil, err
	}

	stateBytes, err := json.MarshalIndent(genesisState, "", " ")
	if err != nil {
		return nil, err
	}

	// init chain will set the validator set and initialize the genesis accounts
	_, err = app.InitChain(
		&abci.RequestInitChain{
			Validators:      []abci.ValidatorUpdate{},
			ConsensusParams: DefaultConsensusParams,
			AppStateBytes:   stateBytes,
		},
	)
	if err != nil {
		return nil, err
	}

	_, err = app.FinalizeBlock(&abci.RequestFinalizeBlock{
		Height:             app.LastBlockHeight() + 1,
		Hash:               app.LastCommitID().Hash,
		NextValidatorsHash: valSet.Hash(),
	})
	if err != nil {
		return nil, err
	}

	return app, nil
}

// SetupWithGenesisAccounts initializes a new SimApp with the provided genesis
// accounts and possible balances.
func SetupWithGenesisAccounts(genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) (*TestApp, error) {
	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey()
	if err != nil {
		return nil, err
	}

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

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

// GenesisStateWithSingleValidator initializes GenesisState with a single validator and genesis accounts
// that also act as delegators.
func GenesisStateWithSingleValidator(app *TestApp) (GenesisState, error) {
	privVal := mock.NewPV()
	pubKey, err := privVal.GetPubKey()
	if err != nil {
		return nil, err
	}

	// create validator set with single validator
	validator := cmttypes.NewValidator(pubKey, 1)
	valSet := cmttypes.NewValidatorSet([]*cmttypes.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, sdkmath.NewInt(100000000000000))),
		},
	}

	genesisState := app.DefaultGenesis()
	genesisState, err = simtestutil.GenesisStateWithValSet(app.AppCodec(), genesisState, valSet, []authtypes.GenesisAccount{acc}, balances...)
	if err != nil {
		return nil, err
	}

	return genesisState, nil
}

// CheckBalance checks the balance of an account.
func CheckBalance(app *TestApp, addr sdk.AccAddress, balances sdk.Coins) {
	ctxCheck := app.BaseApp.NewContext(true)
	if reflect.DeepEqual(balances, app.BankKeeper.GetAllBalances(ctxCheck, addr)) {
		panic("Invalid balance of account")
	}
}

type GenerateAccountStrategy func(int) []sdk.AccAddress

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

	return testAddrs
}

// createIncrementalAccounts is a strategy used by addTestAddrs() in order to generated addresses in ascending order.
func createIncrementalAccounts(accNum int) []sdk.AccAddress {
	var addresses []sdk.AccAddress
	var buffer bytes.Buffer

	// start at 100 so we can make up to 999 test addresses with valid test addresses
	for i := 100; i < (accNum + 100); i++ {
		numString := strconv.Itoa(i)
		buffer.WriteString("A58856F0FD53BF058B4909A21AEC019107BA6") // base address string

		buffer.WriteString(numString) // adding on final two digits to make addresses unique
		res, _ := sdk.AccAddressFromHexUnsafe(buffer.String())
		bech := res.String()
		addr, _ := TestAddr(buffer.String(), bech)

		addresses = append(addresses, addr)
		buffer.Reset()
	}

	return addresses
}

// AddTestAddrsFromPubKeys adds the addresses into the SimApp providing only the public keys.
func AddTestAddrsFromPubKeys(app *TestApp, ctx sdk.Context, pubKeys []cryptotypes.PubKey, accAmt sdkmath.Int) {
	bondDenom, _ := app.StakingKeeper.BondDenom(ctx)
	initCoins := sdk.NewCoins(sdk.NewCoin(bondDenom, 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 *TestApp, ctx sdk.Context, accNum int, accAmt sdkmath.Int) []sdk.AccAddress {
	return addTestAddrs(app, ctx, accNum, accAmt, createRandomAccounts)
}

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

func addTestAddrs(app *TestApp, ctx sdk.Context, accNum int, accAmt sdkmath.Int, strategy GenerateAccountStrategy) []sdk.AccAddress {
	testAddrs := strategy(accNum)
	bondDenom, _ := app.StakingKeeper.BondDenom(ctx)

	initCoins := sdk.NewCoins(sdk.NewCoin(bondDenom, accAmt))

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

	return testAddrs
}

func initAccountWithCoins(app *TestApp, 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
}

func TestAddr(addr string, bech string) (sdk.AccAddress, error) {
	res, err := sdk.AccAddressFromHexUnsafe(addr)
	if err != nil {
		return nil, err
	}
	bechexpected := res.String()
	if bech != bechexpected {
		return nil, fmt.Errorf("bech encoding doesn't match reference")
	}

	bechres, err := sdk.AccAddressFromBech32(bech)
	if err != nil {
		return nil, err
	}
	if !bytes.Equal(bechres, res) {
		return nil, err
	}

	return res, nil
}

// 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(
			rand.New(rand.NewSource(time.Now().UnixNano())),
			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(errorsmod.Wrap(sdkerrors.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
}
