package incentive

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/incentive/client/cli"
	"github.com/kava-labs/kava/x/incentive/client/rest"
	"github.com/kava-labs/kava/x/incentive/keeper"
	"github.com/kava-labs/kava/x/incentive/simulation"
	"github.com/kava-labs/kava/x/incentive/types"
)

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

// AppModuleBasic defines the basic application module used by the incentive module.
type AppModuleBasic struct{}

// Name returns the incentive module's name.
func (AppModuleBasic) Name() string {
	return types.ModuleName
}

// RegisterCodec registers the incentive module's types for the given codec.
func (AppModuleBasic) RegisterCodec(cdc *codec.Codec) {
	types.RegisterCodec(cdc)
}

// DefaultGenesis returns default genesis state as raw bytes for the incentive
// module.
func (AppModuleBasic) DefaultGenesis() json.RawMessage {
	return types.ModuleCdc.MustMarshalJSON(types.DefaultGenesisState())
}

// ValidateGenesis performs genesis state validation for the incentive module.
func (AppModuleBasic) ValidateGenesis(bz json.RawMessage) error {
	var gs types.GenesisState
	err := types.ModuleCdc.UnmarshalJSON(bz, &gs)
	if err != nil {
		return err
	}
	return gs.Validate()
}

// RegisterRESTRoutes registers the REST routes for the incentive module.
func (AppModuleBasic) RegisterRESTRoutes(ctx context.CLIContext, rtr *mux.Router) {
	rest.RegisterRoutes(ctx, rtr)
}

// GetTxCmd returns the root tx command for the incentive module.
func (AppModuleBasic) GetTxCmd(cdc *codec.Codec) *cobra.Command {
	return cli.GetTxCmd(cdc)
}

// GetQueryCmd returns no root query command for the incentive module.
func (AppModuleBasic) GetQueryCmd(cdc *codec.Codec) *cobra.Command {
	return cli.GetQueryCmd(types.StoreKey, cdc)
}

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

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

// RandomizedParams creates randomized incentive param changes for the simulator.
func (AppModuleBasic) RandomizedParams(r *rand.Rand) []sim.ParamChange {
	return simulation.ParamChanges(r)
}

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

// WeightedOperations returns the all the incentive 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.supplyKeeper, am.keeper)
}

// AppModule implements the sdk.AppModule interface.
type AppModule struct {
	AppModuleBasic

	keeper        Keeper
	accountKeeper auth.AccountKeeper
	supplyKeeper  SupplyKeeper
	cdpKeeper     CdpKeeper
}

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

// Name returns the incentive module's name.
func (AppModule) Name() string {
	return types.ModuleName
}

// RegisterInvariants registers the incentive module invariants.
func (am AppModule) RegisterInvariants(_ sdk.InvariantRegistry) {}

// Route returns the message routing key for the incentive module.
func (AppModule) Route() string {
	return types.RouterKey
}

// NewHandler returns an sdk.Handler for the incentive module.
func (am AppModule) NewHandler() sdk.Handler {
	return NewHandler(am.keeper)
}

// QuerierRoute returns the incentive module's querier route name.
func (AppModule) QuerierRoute() string {
	return types.QuerierRoute
}

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

// InitGenesis performs genesis initialization for the incentive module. It returns no validator updates.
func (am AppModule) InitGenesis(ctx sdk.Context, data json.RawMessage) []abci.ValidatorUpdate {
	var gs types.GenesisState
	types.ModuleCdc.MustUnmarshalJSON(data, &gs)
	InitGenesis(ctx, am.keeper, am.supplyKeeper, am.cdpKeeper, gs)
	return []abci.ValidatorUpdate{}
}

// ExportGenesis returns the exported genesis state as raw bytes for the incentive module
func (am AppModule) ExportGenesis(ctx sdk.Context) json.RawMessage {
	gs := ExportGenesis(ctx, am.keeper)
	return types.ModuleCdc.MustMarshalJSON(gs)
}

// BeginBlock returns the begin blocker for the incentive module.
func (am AppModule) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
	BeginBlocker(ctx, am.keeper)
}

// EndBlock returns the end blocker for the incentive module. It returns no validator updates.
func (am AppModule) EndBlock(_ sdk.Context, _ abci.RequestEndBlock) []abci.ValidatorUpdate {
	return []abci.ValidatorUpdate{}
}
