package auth

import (
	"context"
	"encoding/json"
	"fmt"

	modulev1 "cosmossdk.io/api/cosmos/auth/module/v1"
	"cosmossdk.io/core/appmodule"
	"cosmossdk.io/depinject"
	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/spf13/cobra"
	abci "github.com/tendermint/tendermint/abci/types"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	"github.com/cosmos/cosmos-sdk/runtime"
	store "github.com/cosmos/cosmos-sdk/store/types"
	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/auth/client/cli"
	"github.com/cosmos/cosmos-sdk/x/auth/exported"
	"github.com/cosmos/cosmos-sdk/x/auth/keeper"
	"github.com/cosmos/cosmos-sdk/x/auth/simulation"
	"github.com/cosmos/cosmos-sdk/x/auth/types"
	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
)

// ConsensusVersion defines the current x/auth module consensus version.
const ConsensusVersion = 4

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

// 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
}

// RegisterLegacyAminoCodec registers the auth module's types for the given codec.
func (AppModuleBasic) RegisterLegacyAminoCodec(cdc *codec.LegacyAmino) {
	types.RegisterLegacyAminoCodec(cdc)
}

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

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

	return types.ValidateGenesis(data)
}

// RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the auth module.
func (AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx client.Context, mux *gwruntime.ServeMux) {
	if err := types.RegisterQueryHandlerClient(context.Background(), mux, types.NewQueryClient(clientCtx)); err != nil {
		panic(err)
	}
}

// GetTxCmd returns the root tx command for the auth module.
func (AppModuleBasic) GetTxCmd() *cobra.Command {
	return nil
}

// GetQueryCmd returns the root query command for the auth module.
func (AppModuleBasic) GetQueryCmd() *cobra.Command {
	return cli.GetQueryCmd()
}

// RegisterInterfaces registers interfaces and implementations of the auth module.
func (AppModuleBasic) RegisterInterfaces(registry codectypes.InterfaceRegistry) {
	types.RegisterInterfaces(registry)
}

// AppModule implements an application module for the auth module.
type AppModule struct {
	AppModuleBasic

	accountKeeper     keeper.AccountKeeper
	randGenAccountsFn types.RandomGenesisAccountsFn

	// legacySubspace is used solely for migration of x/params managed parameters
	legacySubspace exported.Subspace
}

// NewAppModule creates a new AppModule object
func NewAppModule(cdc codec.Codec, accountKeeper keeper.AccountKeeper, randGenAccountsFn types.RandomGenesisAccountsFn, ss exported.Subspace) AppModule {
	return AppModule{
		AppModuleBasic:    AppModuleBasic{},
		accountKeeper:     accountKeeper,
		randGenAccountsFn: randGenAccountsFn,
		legacySubspace:    ss,
	}
}

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

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

// RegisterServices registers a GRPC query service to respond to the
// module-specific GRPC queries.
func (am AppModule) RegisterServices(cfg module.Configurator) {
	types.RegisterMsgServer(cfg.MsgServer(), keeper.NewMsgServerImpl(am.accountKeeper))
	types.RegisterQueryServer(cfg.QueryServer(), am.accountKeeper)

	m := keeper.NewMigrator(am.accountKeeper, cfg.QueryServer(), am.legacySubspace)
	if err := cfg.RegisterMigration(types.ModuleName, 1, m.Migrate1to2); err != nil {
		panic(err)
	}

	if err := cfg.RegisterMigration(types.ModuleName, 2, m.Migrate2to3); err != nil {
		panic(err)
	}

	if err := cfg.RegisterMigration(types.ModuleName, 3, m.Migrate3to4); err != nil {
		panic(fmt.Sprintf("failed to migrate x/%s from version 3 to 4: %v", types.ModuleName, err))
	}
}

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

// ExportGenesis returns the exported genesis state as raw bytes for the auth
// module.
func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage {
	gs := am.accountKeeper.ExportGenesis(ctx)
	return cdc.MustMarshalJSON(gs)
}

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

// AppModuleSimulation functions

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

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

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

// WeightedOperations doesn't return any auth module operation.
func (AppModule) WeightedOperations(_ 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 AuthInputs struct {
	depinject.In

	Config *modulev1.Module
	Key    *store.KVStoreKey
	Cdc    codec.Codec

	// LegacySubspace is used solely for migration of x/params managed parameters
	LegacySubspace exported.Subspace `optional:"true"`
}

type AuthOutputs struct {
	depinject.Out

	AccountKeeper keeper.AccountKeeper
	Module        runtime.AppModuleWrapper
}

func ProvideModule(in AuthInputs) AuthOutputs {
	maccPerms := map[string][]string{}
	for _, permission := range in.Config.ModuleAccountPermissions {
		maccPerms[permission.Account] = permission.Permissions
	}

	k := keeper.NewAccountKeeper(in.Cdc, in.Key, types.ProtoBaseAccount, maccPerms, in.Config.Bech32Prefix, types.NewModuleAddress(govtypes.ModuleName).String())
	m := NewAppModule(in.Cdc, k, simulation.RandomGenesisAccounts, in.LegacySubspace)

	return AuthOutputs{AccountKeeper: k, Module: runtime.WrapAppModule(m)}
}