package bank

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

	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/spf13/cobra"
	abci "github.com/tendermint/tendermint/abci/types"
	"golang.org/x/exp/maps"

	modulev1 "cosmossdk.io/api/cosmos/bank/module/v1"
	"cosmossdk.io/core/appmodule"
	"cosmossdk.io/depinject"

	"github.com/cosmos/cosmos-sdk/client"
	"github.com/cosmos/cosmos-sdk/codec"
	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
	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"
	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
	"github.com/cosmos/cosmos-sdk/x/bank/client/cli"
	"github.com/cosmos/cosmos-sdk/x/bank/exported"
	"github.com/cosmos/cosmos-sdk/x/bank/keeper"
	v1bank "github.com/cosmos/cosmos-sdk/x/bank/migrations/v1"
	"github.com/cosmos/cosmos-sdk/x/bank/simulation"
	"github.com/cosmos/cosmos-sdk/x/bank/types"
	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
)

// ConsensusVersion defines the current x/bank 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 bank module.
type AppModuleBasic struct {
	cdc codec.Codec
}

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

// RegisterLegacyAminoCodec registers the bank module's types on the LegacyAmino codec.
func (AppModuleBasic) RegisterLegacyAminoCodec(cdc *codec.LegacyAmino) {
	types.RegisterLegacyAminoCodec(cdc)
}

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

// ValidateGenesis performs genesis state validation for the bank module.
func (AppModuleBasic) ValidateGenesis(cdc codec.JSONCodec, _ 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 data.Validate()
}

// RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the bank 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 bank module.
func (AppModuleBasic) GetTxCmd() *cobra.Command {
	return cli.NewTxCmd()
}

// GetQueryCmd returns no root query command for the bank module.
func (AppModuleBasic) GetQueryCmd() *cobra.Command {
	return cli.GetQueryCmd()
}

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

	// Register legacy interfaces for migration scripts.
	v1bank.RegisterInterfaces(registry)
}

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

	keeper        keeper.Keeper
	accountKeeper types.AccountKeeper

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

var _ appmodule.AppModule = AppModule{}

// IsOnePerModuleType implements the depinject.OnePerModuleType interface.
func (am AppModule) IsOnePerModuleType() {}

// IsAppModule implements the appmodule.AppModule interface.
func (am AppModule) IsAppModule() {}

// RegisterServices registers module services.
func (am AppModule) RegisterServices(cfg module.Configurator) {
	types.RegisterMsgServer(cfg.MsgServer(), keeper.NewMsgServerImpl(am.keeper))
	types.RegisterQueryServer(cfg.QueryServer(), am.keeper)

	m := keeper.NewMigrator(am.keeper.(keeper.BaseKeeper), am.legacySubspace)
	if err := cfg.RegisterMigration(types.ModuleName, 1, m.Migrate1to2); err != nil {
		panic(fmt.Sprintf("failed to migrate x/bank from version 1 to 2: %v", err))
	}

	if err := cfg.RegisterMigration(types.ModuleName, 2, m.Migrate2to3); err != nil {
		panic(fmt.Sprintf("failed to migrate x/bank from version 2 to 3: %v", err))
	}

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

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

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

// RegisterInvariants registers the bank module invariants.
func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
	keeper.RegisterInvariants(ir, am.keeper)
}

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

// InitGenesis performs genesis initialization for the bank module. It returns
// no validator updates.
func (am AppModule) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, data json.RawMessage) []abci.ValidatorUpdate {
	start := time.Now()
	var genesisState types.GenesisState
	cdc.MustUnmarshalJSON(data, &genesisState)
	telemetry.MeasureSince(start, "InitGenesis", "crisis", "unmarshal")

	am.keeper.InitGenesis(ctx, &genesisState)
	return []abci.ValidatorUpdate{}
}

// ExportGenesis returns the exported genesis state as raw bytes for the bank
// module.
func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.RawMessage {
	gs := am.keeper.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 bank module.
func (AppModule) GenerateGenesisState(simState *module.SimulationState) {
	simulation.RandomizedGenState(simState)
}

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

// RegisterStoreDecoder registers a decoder for supply module's types
func (am AppModule) RegisterStoreDecoder(_ sdk.StoreDecoderRegistry) {}

// WeightedOperations returns the all the gov module operations with their respective weights.
func (am AppModule) WeightedOperations(simState module.SimulationState) []simtypes.WeightedOperation {
	return simulation.WeightedOperations(
		simState.AppParams, simState.Cdc, am.accountKeeper, am.keeper,
	)
}

// App Wiring Setup

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

type BankInputs struct {
	depinject.In

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

	AccountKeeper types.AccountKeeper

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

type BankOutputs struct {
	depinject.Out

	BankKeeper keeper.BaseKeeper
	Module     appmodule.AppModule
}

func ProvideModule(in BankInputs) BankOutputs {
	// Configure blocked module accounts.
	//
	// Default behavior for blockedAddresses is to regard any module mentioned in
	// AccountKeeper's module account permissions as blocked.
	blockedAddresses := make(map[string]bool)
	if len(in.Config.BlockedModuleAccountsOverride) > 0 {
		for _, moduleName := range in.Config.BlockedModuleAccountsOverride {
			blockedAddresses[authtypes.NewModuleAddress(moduleName).String()] = true
		}
	} else {
		permissions := maps.Values(in.AccountKeeper.GetModulePermissions())
		for _, permission := range permissions {
			blockedAddresses[permission.GetAddress().String()] = true
		}
	}

	// default to governance authority if not provided
	authority := authtypes.NewModuleAddress(govtypes.ModuleName)
	if in.Config.Authority != "" {
		authority = authtypes.NewModuleAddressOrBech32Address(in.Config.Authority)
	}

	bankKeeper := keeper.NewBaseKeeper(
		in.Cdc,
		in.Key,
		in.AccountKeeper,
		blockedAddresses,
		authority.String(),
	)
	m := NewAppModule(in.Cdc, bankKeeper, in.AccountKeeper, in.LegacySubspace)

	return BankOutputs{BankKeeper: bankKeeper, Module: m}
}