package capability

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

	"cosmossdk.io/core/appmodule"
	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/spf13/cobra"

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

	modulev1 "cosmossdk.io/api/cosmos/capability/module/v1"
	"cosmossdk.io/depinject"
	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	cdctypes "github.com/cosmos/cosmos-sdk/codec/types"
	"github.com/cosmos/cosmos-sdk/runtime"
	store "github.com/cosmos/cosmos-sdk/store/types"
	"github.com/cosmos/cosmos-sdk/telemetry"
	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/keeper"
	"github.com/cosmos/cosmos-sdk/x/capability/simulation"
	"github.com/cosmos/cosmos-sdk/x/capability/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.Codec
}

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

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

// RegisterLegacyAminoCodec does nothing. Capability does not support amino.
func (AppModuleBasic) RegisterLegacyAminoCodec(cdc *codec.LegacyAmino) {}

// RegisterInterfaces registers the module's interface types
func (a AppModuleBasic) RegisterInterfaces(_ cdctypes.InterfaceRegistry) {}

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

// ValidateGenesis performs genesis state validation for the capability module.
func (AppModuleBasic) ValidateGenesis(cdc codec.JSONCodec, config client.TxEncodingConfig, 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", types.ModuleName, err)
	}
	return genState.Validate()
}

// RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the capability module.
func (a AppModuleBasic) RegisterGRPCGatewayRoutes(_ client.Context, _ *gwruntime.ServeMux) {
}

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

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

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

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

	keeper keeper.Keeper

	sealKeeper bool
}

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

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

// Deprecated: Route returns the capability module's message routing key.
func (AppModule) Route() sdk.Route {
	return sdk.Route{}
}

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

// LegacyQuerierHandler returns the capability module's Querier.
func (am AppModule) LegacyQuerierHandler(*codec.LegacyAmino) sdk.Querier { return nil }

// RegisterServices registers a GRPC query service to respond to the
// module-specific GRPC queries.
func (am AppModule) RegisterServices(module.Configurator) {}

// 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.JSONCodec, gs json.RawMessage) []abci.ValidatorUpdate {
	var genState types.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.JSONCodec) json.RawMessage {
	genState := ExportGenesis(ctx, am.keeper)
	return cdc.MustMarshalJSON(genState)
}

// ConsensusVersion implements AppModule/ConsensusVersion.
func (AppModule) ConsensusVersion() uint64 { return 1 }

// BeginBlock executes all ABCI BeginBlock logic respective to the capability module.
// BeginBlocker calls InitMemStore to assert that the memory store is initialized.
// It's safe to run multiple times.
func (am AppModule) BeginBlock(ctx sdk.Context, _ abci.RequestBeginBlock) {
	defer telemetry.ModuleMeasureSince(types.ModuleName, time.Now(), telemetry.MetricKeyBeginBlocker)

	am.keeper.InitMemStore(ctx)

	if am.sealKeeper && !am.keeper.IsSealed() {
		am.keeper.Seal()
	}
}

// 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[types.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
}

//
// New App Wiring Setup
//

func init() {
	appmodule.Register(&modulev1.Module{},
		appmodule.Provide(
			provideModuleBasic,
			provideModule,
		))
}

func provideModuleBasic() runtime.AppModuleBasicWrapper {
	return runtime.WrapAppModuleBasic(AppModuleBasic{})
}

type capabilityInputs struct {
	depinject.In

	Config *modulev1.Module

	KvStoreKey  *store.KVStoreKey
	MemStoreKey *store.MemoryStoreKey
	Cdc         codec.Codec
}

type capabilityOutputs struct {
	depinject.Out

	CapabilityKeeper *keeper.Keeper
	Module           runtime.AppModuleWrapper
}

func provideModule(in capabilityInputs) capabilityOutputs {
	k := keeper.NewKeeper(in.Cdc, in.KvStoreKey, in.MemStoreKey)
	m := NewAppModule(in.Cdc, *k, in.Config.SealKeeper)

	return capabilityOutputs{
		CapabilityKeeper: k,
		Module:           runtime.WrapAppModule(m),
	}
}