package staking

import (
	"encoding/json"

	"github.com/gorilla/mux"
	"github.com/spf13/cobra"
	flag "github.com/spf13/pflag"

	abci "github.com/tendermint/tendermint/abci/types"
	cfg "github.com/tendermint/tendermint/config"
	"github.com/tendermint/tendermint/crypto"

	"github.com/cosmos/cosmos-sdk/client/context"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	"github.com/cosmos/cosmos-sdk/x/staking/client/cli"
	"github.com/cosmos/cosmos-sdk/x/staking/client/rest"
	"github.com/cosmos/cosmos-sdk/x/staking/types"
)

var (
	_ module.AppModule      = AppModule{}
	_ module.AppModuleBasic = AppModuleBasic{}
)

// app module basics object
type AppModuleBasic struct{}

var _ module.AppModuleBasic = AppModuleBasic{}

// module name
func (AppModuleBasic) Name() string {
	return ModuleName
}

// register module codec
func (AppModuleBasic) RegisterCodec(cdc *codec.Codec) {
	RegisterCodec(cdc)
}

// default genesis state
func (AppModuleBasic) DefaultGenesis() json.RawMessage {
	return ModuleCdc.MustMarshalJSON(DefaultGenesisState())
}

// module validate genesis
func (AppModuleBasic) ValidateGenesis(bz json.RawMessage) error {
	var data GenesisState
	err := ModuleCdc.UnmarshalJSON(bz, &data)
	if err != nil {
		return err
	}
	return ValidateGenesis(data)
}

// register rest routes
func (AppModuleBasic) RegisterRESTRoutes(ctx context.CLIContext, rtr *mux.Router) {
	rest.RegisterRoutes(ctx, rtr)
}

// get the root tx command of this module
func (AppModuleBasic) GetTxCmd(cdc *codec.Codec) *cobra.Command {
	return cli.GetTxCmd(StoreKey, cdc)
}

// get the root query command of this module
func (AppModuleBasic) GetQueryCmd(cdc *codec.Codec) *cobra.Command {
	return cli.GetQueryCmd(StoreKey, cdc)
}

//_____________________________________
// extra helpers

// CreateValidatorMsgHelpers - used for gen-tx
func (AppModuleBasic) CreateValidatorMsgHelpers(ipDefault string) (
	fs *flag.FlagSet, nodeIDFlag, pubkeyFlag, amountFlag, defaultsDesc string) {
	return cli.CreateValidatorMsgHelpers(ipDefault)
}

// PrepareFlagsForTxCreateValidator - used for gen-tx
func (AppModuleBasic) PrepareFlagsForTxCreateValidator(config *cfg.Config, nodeID,
	chainID string, valPubKey crypto.PubKey) {
	cli.PrepareFlagsForTxCreateValidator(config, nodeID, chainID, valPubKey)
}

// BuildCreateValidatorMsg - used for gen-tx
func (AppModuleBasic) BuildCreateValidatorMsg(cliCtx context.CLIContext,
	txBldr authtypes.TxBuilder) (authtypes.TxBuilder, sdk.Msg, error) {
	return cli.BuildCreateValidatorMsg(cliCtx, txBldr)
}

// app module
type AppModule struct {
	AppModuleBasic
	keeper      Keeper
	fcKeeper    FeeCollectionKeeper
	distrKeeper DistributionKeeper
	accKeeper   AccountKeeper
}

// NewAppModule creates a new AppModule object
func NewAppModule(keeper Keeper, fcKeeper types.FeeCollectionKeeper,
	distrKeeper types.DistributionKeeper, accKeeper AccountKeeper) AppModule {

	return AppModule{
		AppModuleBasic: AppModuleBasic{},
		keeper:         keeper,
		fcKeeper:       fcKeeper,
		distrKeeper:    distrKeeper,
		accKeeper:      accKeeper,
	}
}

// module name
func (AppModule) Name() string {
	return ModuleName
}

// register invariants
func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
	RegisterInvariants(ir, am.keeper, am.fcKeeper, am.distrKeeper, am.accKeeper)
}

// module message route name
func (AppModule) Route() string {
	return RouterKey
}

// module handler
func (am AppModule) NewHandler() sdk.Handler {
	return NewHandler(am.keeper)
}

// module querier route name
func (AppModule) QuerierRoute() string {
	return QuerierRoute
}

// module querier
func (am AppModule) NewQuerierHandler() sdk.Querier {
	return NewQuerier(am.keeper)
}

// module init-genesis
func (am AppModule) InitGenesis(ctx sdk.Context, data json.RawMessage) []abci.ValidatorUpdate {
	var genesisState GenesisState
	ModuleCdc.MustUnmarshalJSON(data, &genesisState)
	return InitGenesis(ctx, am.keeper, am.accKeeper, genesisState)
}

// module export genesis
func (am AppModule) ExportGenesis(ctx sdk.Context) json.RawMessage {
	gs := ExportGenesis(ctx, am.keeper)
	return ModuleCdc.MustMarshalJSON(gs)
}

// module begin-block
func (AppModule) BeginBlock(_ sdk.Context, _ abci.RequestBeginBlock) sdk.Tags {
	return sdk.EmptyTags()
}

// module end-block
func (am AppModule) EndBlock(ctx sdk.Context, _ abci.RequestEndBlock) ([]abci.ValidatorUpdate, sdk.Tags) {
	return EndBlocker(ctx, am.keeper)
}