package capability

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

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"
	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
	"github.com/cosmos/cosmos-sdk/x/capability/simulation"
	"github.com/cosmos/cosmos-sdk/x/capability/types"

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

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

// ----------------------------------------------------------------------------
// AppModuleBasic
// ----------------------------------------------------------------------------

// AppModuleBasic implements the AppModuleBasic interface for the capability module.
type AppModuleBasic struct {
	cdc codec.Marshaler
}

func NewAppModuleBasic(cdc codec.Marshaler) AppModuleBasic {
	return AppModuleBasic{cdc: cdc}
}

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

// RegisterCodec registers the capability module's types to the provided codec.
func (AppModuleBasic) RegisterCodec(cdc *codec.Codec) {
	RegisterCodec(cdc)
}

// DefaultGenesis returns the capability module's default genesis state.
func (AppModuleBasic) DefaultGenesis(cdc codec.JSONMarshaler) json.RawMessage {
	return cdc.MustMarshalJSON(types.DefaultGenesis())
}

// ValidateGenesis performs genesis state validation for the capability module.
func (AppModuleBasic) ValidateGenesis(cdc codec.JSONMarshaler, bz json.RawMessage) error {
	var genState types.GenesisState
	if err := cdc.UnmarshalJSON(bz, &genState); err != nil {
		return fmt.Errorf("failed to unmarshal %s genesis state: %w", ModuleName, err)
	}
	return genState.Validate()
}

// RegisterRESTRoutes registers the capability module's REST service handlers.
func (a AppModuleBasic) RegisterRESTRoutes(_ client.Context, _ *mux.Router) {}

// GetTxCmd returns the capability module's root tx command.
func (a AppModuleBasic) GetTxCmd(_ client.Context) *cobra.Command { return nil }

// GetQueryCmd returns the capability module's root query command.
func (AppModuleBasic) GetQueryCmd(clientCtx client.Context) *cobra.Command { return nil }

// ----------------------------------------------------------------------------
// AppModule
// ----------------------------------------------------------------------------

// AppModule implements the AppModule interface for the capability module.
type AppModule struct {
	AppModuleBasic

	keeper Keeper
}

func NewAppModule(cdc codec.Marshaler, keeper Keeper) AppModule {
	return AppModule{
		AppModuleBasic: NewAppModuleBasic(cdc),
		keeper:         keeper,
	}
}

// Name returns the capability module's name.
func (am AppModule) Name() string {
	return am.AppModuleBasic.Name()
}

// Route returns the capability module's message routing key.
func (AppModule) Route() string { return "" }

// QuerierRoute returns the capability module's query routing key.
func (AppModule) QuerierRoute() string { return "" }

// NewHandler returns the capability module's message Handler.
func (am AppModule) NewHandler() sdk.Handler { return nil }

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

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

// InitGenesis performs the capability module's genesis initialization It returns
// no validator updates.
func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONMarshaler, gs json.RawMessage) []abci.ValidatorUpdate {
	var genState GenesisState
	// Initialize global index to index in genesis state
	cdc.MustUnmarshalJSON(gs, &genState)

	InitGenesis(ctx, am.keeper, genState)

	return []abci.ValidatorUpdate{}
}

// ExportGenesis returns the capability module's exported genesis state as raw JSON bytes.
func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONMarshaler) json.RawMessage {
	genState := ExportGenesis(ctx, am.keeper)
	return cdc.MustMarshalJSON(genState)
}

// BeginBlock executes all ABCI BeginBlock logic respective to the capability module.
func (am AppModule) BeginBlock(_ sdk.Context, _ abci.RequestBeginBlock) {}

// EndBlock executes all ABCI EndBlock logic respective to the capability module. It
// returns no validator updates.
func (am AppModule) EndBlock(_ sdk.Context, _ abci.RequestEndBlock) []abci.ValidatorUpdate {
	return []abci.ValidatorUpdate{}
}

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

// ProposalContents performs a no-op
func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes.WeightedProposalContent {
	return nil
}

// RandomizedParams creates randomized capability param changes for the simulator.
func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
	return nil
}

// RegisterStoreDecoder registers a decoder for capability module's types
func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
	sdr[StoreKey] = simulation.NewDecodeStore(am.cdc)
}

// WeightedOperations returns the all the gov module operations with their respective weights.
func (am AppModule) WeightedOperations(simState module.SimulationState) []simtypes.WeightedOperation {
	return nil
}