package app

import (
	"io"
	"os"

	abci "github.com/tendermint/tendermint/abci/types"
	cmn "github.com/tendermint/tendermint/libs/common"
	"github.com/tendermint/tendermint/libs/log"
	dbm "github.com/tendermint/tm-db"

	bam "github.com/cosmos/cosmos-sdk/baseapp"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	"github.com/cosmos/cosmos-sdk/version"
	"github.com/cosmos/cosmos-sdk/x/auth"
	"github.com/cosmos/cosmos-sdk/x/auth/vesting"
	"github.com/cosmos/cosmos-sdk/x/bank"
	"github.com/cosmos/cosmos-sdk/x/crisis"
	distr "github.com/cosmos/cosmos-sdk/x/distribution"
	"github.com/cosmos/cosmos-sdk/x/genutil"
	"github.com/cosmos/cosmos-sdk/x/gov"
	"github.com/cosmos/cosmos-sdk/x/mint"
	"github.com/cosmos/cosmos-sdk/x/params"
	paramsclient "github.com/cosmos/cosmos-sdk/x/params/client"
	"github.com/cosmos/cosmos-sdk/x/slashing"
	"github.com/cosmos/cosmos-sdk/x/staking"
	"github.com/cosmos/cosmos-sdk/x/supply"

	"github.com/kava-labs/kava/x/auction"
	"github.com/kava-labs/kava/x/cdp"
	"github.com/kava-labs/kava/x/committee"
	"github.com/kava-labs/kava/x/pricefeed"
	validatorvesting "github.com/kava-labs/kava/x/validator-vesting"
)

const (
	appName          = "kava"
	Bech32MainPrefix = "kava"
	Bip44CoinType    = 459 // see https://github.com/satoshilabs/slips/blob/master/slip-0044.md
)

var (
	// default home directories for expected binaries
	DefaultCLIHome  = os.ExpandEnv("$HOME/.kvcli")
	DefaultNodeHome = os.ExpandEnv("$HOME/.kvd")

	// ModuleBasics manages simple versions of full app modules. It's used for things such as codec registration and genesis file verification.
	ModuleBasics = module.NewBasicManager(
		genutil.AppModuleBasic{},
		auth.AppModuleBasic{},
		validatorvesting.AppModuleBasic{},
		bank.AppModuleBasic{},
		staking.AppModuleBasic{},
		mint.AppModuleBasic{},
		distr.AppModuleBasic{},
		gov.NewAppModuleBasic(paramsclient.ProposalHandler, distr.ProposalHandler, committee.ProposalHandler),
		params.AppModuleBasic{},
		crisis.AppModuleBasic{},
		slashing.AppModuleBasic{},
		supply.AppModuleBasic{},
		auction.AppModuleBasic{},
		cdp.AppModuleBasic{},
		pricefeed.AppModuleBasic{},
		committee.AppModuleBasic{},
	)

	// module account permissions
	mAccPerms = map[string][]string{
		auth.FeeCollectorName:       nil,
		distr.ModuleName:            nil,
		mint.ModuleName:             {supply.Minter},
		staking.BondedPoolName:      {supply.Burner, supply.Staking},
		staking.NotBondedPoolName:   {supply.Burner, supply.Staking},
		gov.ModuleName:              {supply.Burner},
		validatorvesting.ModuleName: {supply.Burner},
		auction.ModuleName:          nil,
		cdp.ModuleName:              {supply.Minter, supply.Burner},
		cdp.LiquidatorMacc:          {supply.Minter, supply.Burner},
	}
)

// Extended ABCI application
type App struct {
	*bam.BaseApp
	cdc *codec.Codec

	invCheckPeriod uint

	// keys to access the substores
	keys  map[string]*sdk.KVStoreKey
	tkeys map[string]*sdk.TransientStoreKey

	// keepers from all the modules
	accountKeeper   auth.AccountKeeper
	bankKeeper      bank.Keeper
	supplyKeeper    supply.Keeper
	stakingKeeper   staking.Keeper
	slashingKeeper  slashing.Keeper
	mintKeeper      mint.Keeper
	distrKeeper     distr.Keeper
	govKeeper       gov.Keeper
	crisisKeeper    crisis.Keeper
	paramsKeeper    params.Keeper
	vvKeeper        validatorvesting.Keeper
	auctionKeeper   auction.Keeper
	cdpKeeper       cdp.Keeper
	pricefeedKeeper pricefeed.Keeper
	committeeKeeper committee.Keeper

	// the module manager
	mm *module.Manager

	// simulation manager
	sm *module.SimulationManager
}

// NewApp returns a reference to an initialized App.
func NewApp(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest bool,
	invCheckPeriod uint,
	baseAppOptions ...func(*bam.BaseApp)) *App {

	cdc := MakeCodec()

	bApp := bam.NewBaseApp(appName, logger, db, auth.DefaultTxDecoder(cdc), baseAppOptions...)
	bApp.SetCommitMultiStoreTracer(traceStore)
	bApp.SetAppVersion(version.Version)

	keys := sdk.NewKVStoreKeys(
		bam.MainStoreKey, auth.StoreKey, staking.StoreKey,
		supply.StoreKey, mint.StoreKey, distr.StoreKey, slashing.StoreKey,
		gov.StoreKey, params.StoreKey, validatorvesting.StoreKey,
		auction.StoreKey, cdp.StoreKey, pricefeed.StoreKey, committee.StoreKey,
	)
	tkeys := sdk.NewTransientStoreKeys(params.TStoreKey)

	var app = &App{
		BaseApp:        bApp,
		cdc:            cdc,
		invCheckPeriod: invCheckPeriod,
		keys:           keys,
		tkeys:          tkeys,
	}

	// init params keeper and subspaces
	app.paramsKeeper = params.NewKeeper(app.cdc, keys[params.StoreKey], tkeys[params.TStoreKey], params.DefaultCodespace)
	authSubspace := app.paramsKeeper.Subspace(auth.DefaultParamspace)
	bankSubspace := app.paramsKeeper.Subspace(bank.DefaultParamspace)
	stakingSubspace := app.paramsKeeper.Subspace(staking.DefaultParamspace)
	mintSubspace := app.paramsKeeper.Subspace(mint.DefaultParamspace)
	distrSubspace := app.paramsKeeper.Subspace(distr.DefaultParamspace)
	slashingSubspace := app.paramsKeeper.Subspace(slashing.DefaultParamspace)
	govSubspace := app.paramsKeeper.Subspace(gov.DefaultParamspace).WithKeyTable(gov.ParamKeyTable())
	crisisSubspace := app.paramsKeeper.Subspace(crisis.DefaultParamspace)
	auctionSubspace := app.paramsKeeper.Subspace(auction.DefaultParamspace)
	cdpSubspace := app.paramsKeeper.Subspace(cdp.DefaultParamspace)
	pricefeedSubspace := app.paramsKeeper.Subspace(pricefeed.DefaultParamspace)

	// add keepers
	app.accountKeeper = auth.NewAccountKeeper(
		app.cdc,
		keys[auth.StoreKey],
		authSubspace,
		auth.ProtoBaseAccount)
	app.bankKeeper = bank.NewBaseKeeper(
		app.accountKeeper,
		bankSubspace,
		bank.DefaultCodespace,
		app.ModuleAccountAddrs())
	app.supplyKeeper = supply.NewKeeper(
		app.cdc,
		keys[supply.StoreKey],
		app.accountKeeper,
		app.bankKeeper,
		mAccPerms)
	stakingKeeper := staking.NewKeeper(
		app.cdc,
		keys[staking.StoreKey],
		app.supplyKeeper,
		stakingSubspace,
		staking.DefaultCodespace)
	app.mintKeeper = mint.NewKeeper(
		app.cdc,
		keys[mint.StoreKey],
		mintSubspace,
		&stakingKeeper,
		app.supplyKeeper,
		auth.FeeCollectorName)
	app.distrKeeper = distr.NewKeeper(
		app.cdc,
		keys[distr.StoreKey],
		distrSubspace,
		&stakingKeeper,
		app.supplyKeeper,
		distr.DefaultCodespace,
		auth.FeeCollectorName,
		app.ModuleAccountAddrs())
	app.slashingKeeper = slashing.NewKeeper(
		app.cdc,
		keys[slashing.StoreKey],
		&stakingKeeper,
		slashingSubspace,
		slashing.DefaultCodespace)
	app.crisisKeeper = crisis.NewKeeper(
		crisisSubspace,
		invCheckPeriod,
		app.supplyKeeper,
		auth.FeeCollectorName)
	committeeGovRouter := gov.NewRouter()
	committeeGovRouter.
		AddRoute(gov.RouterKey, gov.ProposalHandler).
		AddRoute(params.RouterKey, params.NewParamChangeProposalHandler(app.paramsKeeper)).
		AddRoute(distr.RouterKey, distr.NewCommunityPoolSpendProposalHandler(app.distrKeeper))
	// Note: the committee proposal handler is not registered on the committee router. This means committees cannot create or update other committees.
	// Adding the committee proposal handler to the router is possible but awkward as the handler depends on the keeper which depends on the handler.
	app.committeeKeeper = committee.NewKeeper(
		app.cdc,
		keys[committee.StoreKey],
		committeeGovRouter) // TODO blacklist module addresses?)
	govRouter := gov.NewRouter()
	govRouter.
		AddRoute(gov.RouterKey, gov.ProposalHandler).
		AddRoute(params.RouterKey, params.NewParamChangeProposalHandler(app.paramsKeeper)).
		AddRoute(distr.RouterKey, distr.NewCommunityPoolSpendProposalHandler(app.distrKeeper)).
		AddRoute(committee.RouterKey, committee.NewProposalHandler(app.committeeKeeper))
	app.govKeeper = gov.NewKeeper(
		app.cdc,
		keys[gov.StoreKey],
		govSubspace,
		app.supplyKeeper,
		&stakingKeeper,
		gov.DefaultCodespace,
		govRouter)
	app.vvKeeper = validatorvesting.NewKeeper(
		app.cdc,
		keys[validatorvesting.StoreKey],
		app.accountKeeper,
		app.bankKeeper,
		app.supplyKeeper,
		&stakingKeeper)
	app.pricefeedKeeper = pricefeed.NewKeeper(
		app.cdc,
		keys[pricefeed.StoreKey],
		pricefeedSubspace,
		pricefeed.DefaultCodespace)
	// NewKeeper(cdc *codec.Codec, key sdk.StoreKey, paramstore subspace.Subspace, pfk types.PricefeedKeeper, sk types.SupplyKeeper, codespace sdk.CodespaceType)
	app.auctionKeeper = auction.NewKeeper(
		app.cdc,
		keys[auction.StoreKey],
		app.supplyKeeper,
		auctionSubspace)
	app.cdpKeeper = cdp.NewKeeper(
		app.cdc,
		keys[cdp.StoreKey],
		cdpSubspace,
		app.pricefeedKeeper,
		app.auctionKeeper,
		app.supplyKeeper,
		cdp.DefaultCodespace)

	// register the staking hooks
	// NOTE: stakingKeeper above is passed by reference, so that it will contain these hooks
	app.stakingKeeper = *stakingKeeper.SetHooks(
		staking.NewMultiStakingHooks(app.distrKeeper.Hooks(), app.slashingKeeper.Hooks()))

	// create the module manager (Note: Any module instantiated in the module manager that is later modified
	// must be passed by reference here.)
	app.mm = module.NewManager(
		genutil.NewAppModule(app.accountKeeper, app.stakingKeeper, app.BaseApp.DeliverTx),
		auth.NewAppModule(app.accountKeeper),
		bank.NewAppModule(app.bankKeeper, app.accountKeeper),
		crisis.NewAppModule(&app.crisisKeeper),
		supply.NewAppModule(app.supplyKeeper, app.accountKeeper),
		distr.NewAppModule(app.distrKeeper, app.supplyKeeper),
		gov.NewAppModule(app.govKeeper, app.supplyKeeper),
		mint.NewAppModule(app.mintKeeper),
		slashing.NewAppModule(app.slashingKeeper, app.stakingKeeper),
		staking.NewAppModule(app.stakingKeeper, app.accountKeeper, app.supplyKeeper),
		validatorvesting.NewAppModule(app.vvKeeper, app.accountKeeper),
		auction.NewAppModule(app.auctionKeeper, app.supplyKeeper),
		cdp.NewAppModule(app.cdpKeeper, app.pricefeedKeeper),
		pricefeed.NewAppModule(app.pricefeedKeeper),
		committee.NewAppModule(app.committeeKeeper),
	)

	// During begin block slashing happens after distr.BeginBlocker so that
	// there is nothing left over in the validator fee pool, so as to keep the
	// CanWithdrawInvariant invariant.
	// Auction.BeginBlocker will close out expired auctions and pay debt back to cdp. So it should be run before cdp.BeginBlocker which cancels out debt with stable and starts more auctions.
	app.mm.SetOrderBeginBlockers(mint.ModuleName, distr.ModuleName, slashing.ModuleName, validatorvesting.ModuleName, auction.ModuleName, cdp.ModuleName, committee.ModuleName)

	app.mm.SetOrderEndBlockers(crisis.ModuleName, gov.ModuleName, staking.ModuleName, pricefeed.ModuleName)

	// Note: genutils must occur after staking so that pools are properly
	// initialized with tokens from genesis accounts.
	//
	// Note: Changing the order of the auth module and modules that use module accounts
	// results in subtle changes to the way accounts are loaded from genesis.
	app.mm.SetOrderInitGenesis(
		auth.ModuleName, validatorvesting.ModuleName, distr.ModuleName,
		staking.ModuleName, bank.ModuleName, slashing.ModuleName,
		gov.ModuleName, mint.ModuleName, supply.ModuleName, crisis.ModuleName, genutil.ModuleName,
		pricefeed.ModuleName, cdp.ModuleName, auction.ModuleName, committee.ModuleName, // TODO is this order ok?
	)

	app.mm.RegisterInvariants(&app.crisisKeeper)
	app.mm.RegisterRoutes(app.Router(), app.QueryRouter())

	// create the simulation manager and define the order of the modules for deterministic simulations
	//
	// NOTE: This is not required for apps that don't use the simulator for fuzz testing
	// transactions.
	app.sm = module.NewSimulationManager(
		auth.NewAppModule(app.accountKeeper),
		validatorvesting.NewAppModule(app.vvKeeper, app.accountKeeper),
		bank.NewAppModule(app.bankKeeper, app.accountKeeper),
		supply.NewAppModule(app.supplyKeeper, app.accountKeeper),
		gov.NewAppModule(app.govKeeper, app.supplyKeeper),
		mint.NewAppModule(app.mintKeeper),
		distr.NewAppModule(app.distrKeeper, app.supplyKeeper),
		staking.NewAppModule(app.stakingKeeper, app.accountKeeper, app.supplyKeeper),
		slashing.NewAppModule(app.slashingKeeper, app.stakingKeeper),
		cdp.NewAppModule(app.cdpKeeper, app.pricefeedKeeper), // TODO how is the order be decided here? Is this order correct?
		pricefeed.NewAppModule(app.pricefeedKeeper),
		auction.NewAppModule(app.auctionKeeper, app.supplyKeeper),
		// TODO committee
	)

	app.sm.RegisterStoreDecoders()

	// initialize stores
	app.MountKVStores(keys)
	app.MountTransientStores(tkeys)

	// initialize the app
	app.SetInitChainer(app.InitChainer)
	app.SetBeginBlocker(app.BeginBlocker)
	// TODO app.SetAnteHandler(NewAnteHandler(app.accountKeeper, app.supplyKeeper, app.shutdownKeeper, auth.DefaultSigVerificationGasConsumer))
	app.SetAnteHandler(auth.NewAnteHandler(app.accountKeeper, app.supplyKeeper, auth.DefaultSigVerificationGasConsumer))
	app.SetEndBlocker(app.EndBlocker)

	// load store
	if loadLatest {
		err := app.LoadLatestVersion(app.keys[bam.MainStoreKey])
		if err != nil {
			cmn.Exit(err.Error())
		}
	}

	return app
}

// func NewAnteHandler(ak auth.AccountKeeper, supplyKeeper supply.Keeper, shutdownKeeper shutdown.Keeper, sigGasConsumer SignatureVerificationGasConsumer) sdk.AnteHandler {
// 	return sdk.ChainAnteDecorators(
// 		auth.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
// 		shutdownAnte.NewDisableMsgDecorator(shutdownKeeper),
// 		auth.NewMempoolFeeDecorator(),
// 		auth.NewValidateBasicDecorator(),
// 		auth.NewValidateMemoDecorator(ak),
// 		auth.NewConsumeGasForTxSizeDecorator(ak),
// 		auth.NewSetPubKeyDecorator(ak), // SetPubKeyDecorator must be called before all signature verification decorators
// 		auth.NewValidateSigCountDecorator(ak),
// 		auth.NewDeductFeeDecorator(ak, supplyKeeper),
// 		auth.NewSigGasConsumeDecorator(ak, sigGasConsumer),
// 		auth.NewSigVerificationDecorator(ak),
// 		auth.NewIncrementSequenceDecorator(ak), // innermost AnteDecorator
// 	)
// }

// custom tx codec
func MakeCodec() *codec.Codec {
	var cdc = codec.New()

	ModuleBasics.RegisterCodec(cdc)
	vesting.RegisterCodec(cdc)
	sdk.RegisterCodec(cdc)
	codec.RegisterCrypto(cdc)
	codec.RegisterEvidences(cdc)

	return cdc.Seal()
}

// SetBech32AddressPrefixes sets the global prefix to be used when serializing addresses to bech32 strings.
func SetBech32AddressPrefixes(config *sdk.Config) {
	config.SetBech32PrefixForAccount(Bech32MainPrefix, Bech32MainPrefix+sdk.PrefixPublic)
	config.SetBech32PrefixForValidator(Bech32MainPrefix+sdk.PrefixValidator+sdk.PrefixOperator, Bech32MainPrefix+sdk.PrefixValidator+sdk.PrefixOperator+sdk.PrefixPublic)
	config.SetBech32PrefixForConsensusNode(Bech32MainPrefix+sdk.PrefixValidator+sdk.PrefixConsensus, Bech32MainPrefix+sdk.PrefixValidator+sdk.PrefixConsensus+sdk.PrefixPublic)
}

// SetBip44CoinType sets the global coin type to be used in hierarchical deterministic wallets.
func SetBip44CoinType(config *sdk.Config) {
	config.SetCoinType(Bip44CoinType)
}

// application updates every end block
func (app *App) BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock) abci.ResponseBeginBlock {
	return app.mm.BeginBlock(ctx, req)
}

// application updates every end block
func (app *App) EndBlocker(ctx sdk.Context, req abci.RequestEndBlock) abci.ResponseEndBlock {
	return app.mm.EndBlock(ctx, req)
}

// custom logic for app initialization
func (app *App) InitChainer(ctx sdk.Context, req abci.RequestInitChain) abci.ResponseInitChain {
	var genesisState GenesisState
	app.cdc.MustUnmarshalJSON(req.AppStateBytes, &genesisState)
	return app.mm.InitGenesis(ctx, genesisState)
}

// load a particular height
func (app *App) LoadHeight(height int64) error {
	return app.LoadVersion(height, app.keys[bam.MainStoreKey])
}

// ModuleAccountAddrs returns all the app's module account addresses.
func (app *App) ModuleAccountAddrs() map[string]bool {
	modAccAddrs := make(map[string]bool)
	for acc := range mAccPerms {
		modAccAddrs[supply.NewModuleAddress(acc).String()] = true
	}

	return modAccAddrs
}

// Codec returns the application's sealed codec.
func (app *App) Codec() *codec.Codec {
	return app.cdc
}

// GetMaccPerms returns a mapping of the application's module account permissions.
func GetMaccPerms() map[string][]string {
	perms := make(map[string][]string)
	for k, v := range mAccPerms {
		perms[k] = v
	}
	return perms
}