package validatorvesting

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

	"github.com/gorilla/mux"
	"github.com/spf13/cobra"
	abci "github.com/tendermint/tendermint/abci/types"

	"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"
	sim "github.com/cosmos/cosmos-sdk/x/simulation"
	"github.com/kava-labs/kava/x/validator-vesting/internal/types"
	"github.com/kava-labs/kava/x/validator-vesting/simulation"
)

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

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

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

// RegisterCodec registers the auth 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 validator-vesting
// module.
func (AppModuleBasic) DefaultGenesis() json.RawMessage {
	return types.ModuleCdc.MustMarshalJSON(types.DefaultGenesisState())
}

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

// RegisterRESTRoutes registers no REST routes for the crisis module.
func (AppModuleBasic) RegisterRESTRoutes(_ context.CLIContext, _ *mux.Router) {}

// GetTxCmd returns no root tx command for the validator-vesting module.
func (AppModuleBasic) GetTxCmd(_ *codec.Codec) *cobra.Command { return nil }

// GetQueryCmd returns no root query command for the validator-vesting module.
func (AppModuleBasic) GetQueryCmd(_ *codec.Codec) *cobra.Command { return nil }

// AppModuleSimulation defines the module simulation functions used by the auth module.
type AppModuleSimulation struct{}

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

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

// RandomizedParams returns nil because validatorvesting has no params.
func (AppModuleSimulation) RandomizedParams(_ *rand.Rand) []sim.ParamChange {
	return []sim.ParamChange{}
}

// AppModule implements an application module for the validator-vesting module.
type AppModule struct {
	AppModuleBasic
	AppModuleSimulation
	keeper        Keeper
	accountKeeper types.AccountKeeper
}

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

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

// RegisterInvariants performs a no-op.
func (AppModule) RegisterInvariants(_ sdk.InvariantRegistry) {}

// Route returns the message routing key for the auth module.
func (AppModule) Route() string { return "" }

// NewHandler returns an sdk.Handler for the auth module.
func (AppModule) NewHandler() sdk.Handler { return nil }

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

// NewQuerierHandler returns the auth module sdk.Querier.
func (am AppModule) NewQuerierHandler() sdk.Querier {
	return nil
}

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

// ExportGenesis returns the exported genesis state as raw bytes for the auth
// 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 auth module.
func (am AppModule) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
	BeginBlocker(ctx, req, am.keeper)
}

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