package committee

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

	"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"
	cdctypes "github.com/cosmos/cosmos-sdk/codec/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/module"

	"github.com/0glabs/0g-chain/x/committee/client/cli"
	"github.com/0glabs/0g-chain/x/committee/keeper"
	"github.com/0glabs/0g-chain/x/committee/types"
)

// ConsensusVersion defines the current module consensus version.
const ConsensusVersion = 1

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

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

// AppModuleBasic app module basics object
type AppModuleBasic struct{}

// Name get module name
func (AppModuleBasic) Name() string {
	return types.ModuleName
}

// Registers legacy amino codec
func (AppModuleBasic) RegisterLegacyAminoCodec(cdc *codec.LegacyAmino) {
	types.RegisterLegacyAminoCodec(cdc)
}

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

// DefaultGenesis default genesis state
func (AppModuleBasic) DefaultGenesis(cdc codec.JSONCodec) json.RawMessage {
	return cdc.MustMarshalJSON(types.DefaultGenesisState())
}

// ValidateGenesis module validate genesis
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 committee module.
func (AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx client.Context, mux *runtime.ServeMux) {
	types.RegisterQueryHandlerClient(context.Background(), mux, types.NewQueryClient(clientCtx))
}

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

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

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

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

	keeper        keeper.Keeper
	accountKeeper types.AccountKeeper
}

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

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

// Route returns committee module's message route.
func (am AppModule) Route() sdk.Route { return sdk.Route{} }

// QuerierRoute returns committee module's query routing key.
func (AppModule) QuerierRoute() string { return types.QuerierRoute }

// LegacyQuerierHandler returns committee module's Querier.
func (am AppModule) LegacyQuerierHandler(legacyQuerierCdc *codec.LegacyAmino) sdk.Querier {
	return keeper.NewQuerier(am.keeper, legacyQuerierCdc)
}

// 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.keeper))
	types.RegisterQueryServer(cfg.QueryServer(), keeper.NewQueryServerImpl(am.keeper))
}

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

// InitGenesis performs committee 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
	cdc.MustUnmarshalJSON(gs, &genState)
	InitGenesis(ctx, am.keeper, &genState)
	return []abci.ValidatorUpdate{}
}

// ExportGenesis returns committee 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 ConsensusVersion.
func (AppModule) ConsensusVersion() uint64 { return ConsensusVersion }

// BeginBlock executes all ABCI BeginBlock logic respective to committee module.
func (am AppModule) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
	BeginBlocker(ctx, req, am.keeper)
}

// EndBlock executes all ABCI EndBlock logic respective to committee 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 auction module
// func (AppModuleBasic) GenerateGenesisState(simState *module.SimulationState) {
// 	simulation.RandomizedGenState(simState)
// }

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

// RandomizedParams returns functions that generate params for the module
// func (AppModuleBasic) RandomizedParams(r *rand.Rand) []sim.ParamChange {
// 	return nil
// }

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

// // WeightedOperations returns the module operations for use in simulations
// func (am AppModule) WeightedOperations(simState module.SimulationState) []sim.WeightedOperation {
// 	return simulation.WeightedOperations(simState.AppParams, simState.Cdc, am.accountKeeper, am.keeper, simState.Contents)
// }