package pricefeed

import (
	"encoding/json"
	"math/rand"

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

	"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"
	"github.com/cosmos/cosmos-sdk/x/auth"
	sim "github.com/cosmos/cosmos-sdk/x/simulation"

	abci "github.com/tendermint/tendermint/abci/types"

	"github.com/kava-labs/kava/x/pricefeed/client/cli"
	"github.com/kava-labs/kava/x/pricefeed/client/rest"
	"github.com/kava-labs/kava/x/pricefeed/simulation"
)

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

// AppModuleBasic app module basics object
type AppModuleBasic struct{}

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

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

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

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

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

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

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

//____________________________________________________________________________

// AppModule app module type
type AppModule struct {
	AppModuleBasic

	keeper        Keeper
	accountKeeper auth.AccountKeeper
}

// NewAppModule creates a new AppModule object
func NewAppModule(keeper Keeper, accountKeeper auth.AccountKeeper) AppModule {
	return AppModule{
		AppModuleBasic: AppModuleBasic{},
		keeper:         keeper,
		accountKeeper:  accountKeeper,
	}
}

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

// RegisterInvariants register module invariants
func (AppModule) RegisterInvariants(_ sdk.InvariantRegistry) {}

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

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

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

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

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

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

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

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

//____________________________________________________________________________

// AppModuleSimulation functions

// GenerateGenesisState creates a randomized GenState of the price feed module
func (AppModuleBasic) GenerateGenesisState(simState *module.SimulationState) {
	simulation.RandomizedGenState(simState)
}

// ProposalContents doesn't return any content functions for governance proposals.
func (AppModuleBasic) ProposalContents(_ module.SimulationState) []sim.WeightedProposalContent {
	return nil
}

// RandomizedParams returns nil because price feed has no params.
func (AppModuleBasic) RandomizedParams(r *rand.Rand) []sim.ParamChange {
	return simulation.ParamChanges(r)
}

// RegisterStoreDecoder registers a decoder for price feed module's types
func (AppModuleBasic) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
	sdr[StoreKey] = simulation.DecodeStore
}

// WeightedOperations returns the all the price feed module operations with their respective weights.
func (am AppModule) WeightedOperations(simState module.SimulationState) []sim.WeightedOperation {
	return simulation.WeightedOperations(simState.AppParams, simState.Cdc, am.accountKeeper, am.keeper)
}
